lightning.proto

syntax = "proto3";

package lnrpc;

option go_package = "github.com/lightningnetwork/lnd/lnrpc";

/*
 * Comments in this file will be directly parsed into the API
 * Documentation as descriptions of the associated method, message, or field.
 * These descriptions should go right above the definition of the object, and
 * can be in either block or // comment format.
 *
 * An RPC method can be matched to an lncli command by placing a line in the
 * beginning of the description in exactly the following format:
 * lncli: `methodname`
 *
 * Failure to specify the exact name of the command will cause documentation
 * generation to fail.
 *
 * More information on how exactly the gRPC documentation is generated from
 * this proto file can be found here:
 * https://github.com/lightninglabs/lightning-api
 */

// Lightning is the main RPC server of the daemon.
service Lightning {
    /* lncli: `walletbalance`
    WalletBalance returns total unspent outputs(confirmed and unconfirmed), all
    confirmed unspent outputs and all unconfirmed unspent outputs under control
    of the wallet.
    */
    rpc WalletBalance (WalletBalanceRequest) returns (WalletBalanceResponse);

    /* lncli: `channelbalance`
    ChannelBalance returns a report on the total funds across all open channels,
    categorized in local/remote, pending local/remote and unsettled local/remote
    balances.
    */
    rpc ChannelBalance (ChannelBalanceRequest) returns (ChannelBalanceResponse);

    /* lncli: `listchaintxns`
    GetTransactions returns a list describing all the known transactions
    relevant to the wallet.
    */
    rpc GetTransactions (GetTransactionsRequest) returns (TransactionDetails);

    /* lncli: `estimatefee`
    EstimateFee asks the chain backend to estimate the fee rate and total fees
    for a transaction that pays to multiple specified outputs.

    When using REST, the `AddrToAmount` map type can be set by appending
    `&AddrToAmount[<address>]=<amount_to_send>` to the URL. Unfortunately this
    map type doesn't appear in the REST API documentation because of a bug in
    the grpc-gateway library.
    */
    rpc EstimateFee (EstimateFeeRequest) returns (EstimateFeeResponse);

    /* lncli: `sendcoins`
    SendCoins executes a request to send coins to a particular address. Unlike
    SendMany, this RPC call only allows creating a single output at a time. If
    neither target_conf, or sat_per_vbyte are set, then the internal wallet will
    consult its fee model to determine a fee for the default confirmation
    target.
    */
    rpc SendCoins (SendCoinsRequest) returns (SendCoinsResponse);

    /* lncli: `listunspent`
    Deprecated, use walletrpc.ListUnspent instead.

    ListUnspent returns a list of all utxos spendable by the wallet with a
    number of confirmations between the specified minimum and maximum.
    */
    rpc ListUnspent (ListUnspentRequest) returns (ListUnspentResponse);

    /*
    SubscribeTransactions creates a uni-directional stream from the server to
    the client in which any newly discovered transactions relevant to the
    wallet are sent over.
    */
    rpc SubscribeTransactions (GetTransactionsRequest)
        returns (stream Transaction);

    /* lncli: `sendmany`
    SendMany handles a request for a transaction that creates multiple specified
    outputs in parallel. If neither target_conf, or sat_per_vbyte are set, then
    the internal wallet will consult its fee model to determine a fee for the
    default confirmation target.
    */
    rpc SendMany (SendManyRequest) returns (SendManyResponse);

    /* lncli: `newaddress`
    NewAddress creates a new address under control of the local wallet.
    */
    rpc NewAddress (NewAddressRequest) returns (NewAddressResponse);

    /* lncli: `signmessage`
    SignMessage signs a message with this node's private key. The returned
    signature string is `zbase32` encoded and pubkey recoverable, meaning that
    only the message digest and signature are needed for verification.
    */
    rpc SignMessage (SignMessageRequest) returns (SignMessageResponse);

    /* lncli: `verifymessage`
    VerifyMessage verifies a signature over a msg. The signature must be
    zbase32 encoded and signed by an active node in the resident node's
    channel database. In addition to returning the validity of the signature,
    VerifyMessage also returns the recovered pubkey from the signature.
    */
    rpc VerifyMessage (VerifyMessageRequest) returns (VerifyMessageResponse);

    /* lncli: `connect`
    ConnectPeer attempts to establish a connection to a remote peer. This is at
    the networking level, and is used for communication between nodes. This is
    distinct from establishing a channel with a peer.
    */
    rpc ConnectPeer (ConnectPeerRequest) returns (ConnectPeerResponse);

    /* lncli: `disconnect`
    DisconnectPeer attempts to disconnect one peer from another identified by a
    given pubKey. In the case that we currently have a pending or active channel
    with the target peer, then this action will be not be allowed.
    */
    rpc DisconnectPeer (DisconnectPeerRequest) returns (DisconnectPeerResponse);

    /* lncli: `listpeers`
    ListPeers returns a verbose listing of all currently active peers.
    */
    rpc ListPeers (ListPeersRequest) returns (ListPeersResponse);

    /*
    SubscribePeerEvents creates a uni-directional stream from the server to
    the client in which any events relevant to the state of peers are sent
    over. Events include peers going online and offline.
    */
    rpc SubscribePeerEvents (PeerEventSubscription) returns (stream PeerEvent);

    /* lncli: `getinfo`
    GetInfo returns general information concerning the lightning node including
    it's identity pubkey, alias, the chains it is connected to, and information
    concerning the number of open+pending channels.
    */
    rpc GetInfo (GetInfoRequest) returns (GetInfoResponse);

    /** lncli: `getrecoveryinfo`
    GetRecoveryInfo returns information concerning the recovery mode including
    whether it's in a recovery mode, whether the recovery is finished, and the
    progress made so far.
    */
    rpc GetRecoveryInfo (GetRecoveryInfoRequest)
        returns (GetRecoveryInfoResponse);

    // TODO(roasbeef): merge with below with bool?
    /* lncli: `pendingchannels`
    PendingChannels returns a list of all the channels that are currently
    considered "pending". A channel is pending if it has finished the funding
    workflow and is waiting for confirmations for the funding txn, or is in the
    process of closure, either initiated cooperatively or non-cooperatively.
    */
    rpc PendingChannels (PendingChannelsRequest)
        returns (PendingChannelsResponse);

    /* lncli: `listchannels`
    ListChannels returns a description of all the open channels that this node
    is a participant in.
    */
    rpc ListChannels (ListChannelsRequest) returns (ListChannelsResponse);

    /*
    SubscribeChannelEvents creates a uni-directional stream from the server to
    the client in which any updates relevant to the state of the channels are
    sent over. Events include new active channels, inactive channels, and closed
    channels.
    */
    rpc SubscribeChannelEvents (ChannelEventSubscription)
        returns (stream ChannelEventUpdate);

    /* lncli: `closedchannels`
    ClosedChannels returns a description of all the closed channels that
    this node was a participant in.
    */
    rpc ClosedChannels (ClosedChannelsRequest) returns (ClosedChannelsResponse);

    /*
    OpenChannelSync is a synchronous version of the OpenChannel RPC call. This
    call is meant to be consumed by clients to the REST proxy. As with all
    other sync calls, all byte slices are intended to be populated as hex
    encoded strings.
    */
    rpc OpenChannelSync (OpenChannelRequest) returns (ChannelPoint);

    /* lncli: `openchannel`
    OpenChannel attempts to open a singly funded channel specified in the
    request to a remote peer. Users are able to specify a target number of
    blocks that the funding transaction should be confirmed in, or a manual fee
    rate to us for the funding transaction. If neither are specified, then a
    lax block confirmation target is used. Each OpenStatusUpdate will return
    the pending channel ID of the in-progress channel. Depending on the
    arguments specified in the OpenChannelRequest, this pending channel ID can
    then be used to manually progress the channel funding flow.
    */
    rpc OpenChannel (OpenChannelRequest) returns (stream OpenStatusUpdate);

    /* lncli: `batchopenchannel`
    BatchOpenChannel attempts to open multiple single-funded channels in a
    single transaction in an atomic way. This means either all channel open
    requests succeed at once or all attempts are aborted if any of them fail.
    This is the safer variant of using PSBTs to manually fund a batch of
    channels through the OpenChannel RPC.
    */
    rpc BatchOpenChannel (BatchOpenChannelRequest)
        returns (BatchOpenChannelResponse);

    /*
    FundingStateStep is an advanced funding related call that allows the caller
    to either execute some preparatory steps for a funding workflow, or
    manually progress a funding workflow. The primary way a funding flow is
    identified is via its pending channel ID. As an example, this method can be
    used to specify that we're expecting a funding flow for a particular
    pending channel ID, for which we need to use specific parameters.
    Alternatively, this can be used to interactively drive PSBT signing for
    funding for partially complete funding transactions.
    */
    rpc FundingStateStep (FundingTransitionMsg) returns (FundingStateStepResp);

    /*
    ChannelAcceptor dispatches a bi-directional streaming RPC in which
    OpenChannel requests are sent to the client and the client responds with
    a boolean that tells LND whether or not to accept the channel. This allows
    node operators to specify their own criteria for accepting inbound channels
    through a single persistent connection.
    */
    rpc ChannelAcceptor (stream ChannelAcceptResponse)
        returns (stream ChannelAcceptRequest);

    /* lncli: `closechannel`
    CloseChannel attempts to close an active channel identified by its channel
    outpoint (ChannelPoint). The actions of this method can additionally be
    augmented to attempt a force close after a timeout period in the case of an
    inactive peer. If a non-force close (cooperative closure) is requested,
    then the user can specify either a target number of blocks until the
    closure transaction is confirmed, or a manual fee rate. If neither are
    specified, then a default lax, block confirmation target is used.
    */
    rpc CloseChannel (CloseChannelRequest) returns (stream CloseStatusUpdate);

    /* lncli: `abandonchannel`
    AbandonChannel removes all channel state from the database except for a
    close summary. This method can be used to get rid of permanently unusable
    channels due to bugs fixed in newer versions of lnd. This method can also be
    used to remove externally funded channels where the funding transaction was
    never broadcast. Only available for non-externally funded channels in dev
    build.
    */
    rpc AbandonChannel (AbandonChannelRequest) returns (AbandonChannelResponse);

    /* lncli: `sendpayment`
    Deprecated, use routerrpc.SendPaymentV2. SendPayment dispatches a
    bi-directional streaming RPC for sending payments through the Lightning
    Network. A single RPC invocation creates a persistent bi-directional
    stream allowing clients to rapidly send payments through the Lightning
    Network with a single persistent connection.
    */
    rpc SendPayment (stream SendRequest) returns (stream SendResponse) {
        option deprecated = true;
    }

    /*
    SendPaymentSync is the synchronous non-streaming version of SendPayment.
    This RPC is intended to be consumed by clients of the REST proxy.
    Additionally, this RPC expects the destination's public key and the payment
    hash (if any) to be encoded as hex strings.
    */
    rpc SendPaymentSync (SendRequest) returns (SendResponse);

    /* lncli: `sendtoroute`
    Deprecated, use routerrpc.SendToRouteV2. SendToRoute is a bi-directional
    streaming RPC for sending payment through the Lightning Network. This
    method differs from SendPayment in that it allows users to specify a full
    route manually. This can be used for things like rebalancing, and atomic
    swaps.
    */
    rpc SendToRoute (stream SendToRouteRequest) returns (stream SendResponse) {
        option deprecated = true;
    }

    /*
    SendToRouteSync is a synchronous version of SendToRoute. It Will block
    until the payment either fails or succeeds.
    */
    rpc SendToRouteSync (SendToRouteRequest) returns (SendResponse);

    /* lncli: `addinvoice`
    AddInvoice attempts to add a new invoice to the invoice database. Any
    duplicated invoices are rejected, therefore all invoices *must* have a
    unique payment preimage.
    */
    rpc AddInvoice (Invoice) returns (AddInvoiceResponse);

    /* lncli: `listinvoices`
    ListInvoices returns a list of all the invoices currently stored within the
    database. Any active debug invoices are ignored. It has full support for
    paginated responses, allowing users to query for specific invoices through
    their add_index. This can be done by using either the first_index_offset or
    last_index_offset fields included in the response as the index_offset of the
    next request. By default, the first 100 invoices created will be returned.
    Backwards pagination is also supported through the Reversed flag.
    */
    rpc ListInvoices (ListInvoiceRequest) returns (ListInvoiceResponse);

    /* lncli: `lookupinvoice`
    LookupInvoice attempts to look up an invoice according to its payment hash.
    The passed payment hash *must* be exactly 32 bytes, if not, an error is
    returned.
    */
    rpc LookupInvoice (PaymentHash) returns (Invoice);

    /*
    SubscribeInvoices returns a uni-directional stream (server -> client) for
    notifying the client of newly added/settled invoices. The caller can
    optionally specify the add_index and/or the settle_index. If the add_index
    is specified, then we'll first start by sending add invoice events for all
    invoices with an add_index greater than the specified value. If the
    settle_index is specified, the next, we'll send out all settle events for
    invoices with a settle_index greater than the specified value. One or both
    of these fields can be set. If no fields are set, then we'll only send out
    the latest add/settle events.
    */
    rpc SubscribeInvoices (InvoiceSubscription) returns (stream Invoice);

    /* lncli: `decodepayreq`
    DecodePayReq takes an encoded payment request string and attempts to decode
    it, returning a full description of the conditions encoded within the
    payment request.
    */
    rpc DecodePayReq (PayReqString) returns (PayReq);

    /* lncli: `listpayments`
    ListPayments returns a list of all outgoing payments.
    */
    rpc ListPayments (ListPaymentsRequest) returns (ListPaymentsResponse);

    /*
    DeletePayment deletes an outgoing payment from DB. Note that it will not
    attempt to delete an In-Flight payment, since that would be unsafe.
    */
    rpc DeletePayment (DeletePaymentRequest) returns (DeletePaymentResponse);

    /*
    DeleteAllPayments deletes all outgoing payments from DB. Note that it will
    not attempt to delete In-Flight payments, since that would be unsafe.
    */
    rpc DeleteAllPayments (DeleteAllPaymentsRequest)
        returns (DeleteAllPaymentsResponse);

    /* lncli: `describegraph`
    DescribeGraph returns a description of the latest graph state from the
    point of view of the node. The graph information is partitioned into two
    components: all the nodes/vertexes, and all the edges that connect the
    vertexes themselves. As this is a directed graph, the edges also contain
    the node directional specific routing policy which includes: the time lock
    delta, fee information, etc.
    */
    rpc DescribeGraph (ChannelGraphRequest) returns (ChannelGraph);

    /* lncli: `getnodemetrics`
    GetNodeMetrics returns node metrics calculated from the graph. Currently
    the only supported metric is betweenness centrality of individual nodes.
    */
    rpc GetNodeMetrics (NodeMetricsRequest) returns (NodeMetricsResponse);

    /* lncli: `getchaninfo`
    GetChanInfo returns the latest authenticated network announcement for the
    given channel identified by its channel ID: an 8-byte integer which
    uniquely identifies the location of transaction's funding output within the
    blockchain.
    */
    rpc GetChanInfo (ChanInfoRequest) returns (ChannelEdge);

    /* lncli: `getnodeinfo`
    GetNodeInfo returns the latest advertised, aggregated, and authenticated
    channel information for the specified node identified by its public key.
    */
    rpc GetNodeInfo (NodeInfoRequest) returns (NodeInfo);

    /* lncli: `queryroutes`
    QueryRoutes attempts to query the daemon's Channel Router for a possible
    route to a target destination capable of carrying a specific amount of
    satoshis. The returned route contains the full details required to craft and
    send an HTLC, also including the necessary information that should be
    present within the Sphinx packet encapsulated within the HTLC.

    When using REST, the `dest_custom_records` map type can be set by appending
    `&dest_custom_records[<record_number>]=<record_data_base64_url_encoded>`
    to the URL. Unfortunately this map type doesn't appear in the REST API
    documentation because of a bug in the grpc-gateway library.
    */
    rpc QueryRoutes (QueryRoutesRequest) returns (QueryRoutesResponse);

    /* lncli: `getnetworkinfo`
    GetNetworkInfo returns some basic stats about the known channel graph from
    the point of view of the node.
    */
    rpc GetNetworkInfo (NetworkInfoRequest) returns (NetworkInfo);

    /* lncli: `stop`
    StopDaemon will send a shutdown request to the interrupt handler, triggering
    a graceful shutdown of the daemon.
    */
    rpc StopDaemon (StopRequest) returns (StopResponse);

    /*
    SubscribeChannelGraph launches a streaming RPC that allows the caller to
    receive notifications upon any changes to the channel graph topology from
    the point of view of the responding node. Events notified include: new
    nodes coming online, nodes updating their authenticated attributes, new
    channels being advertised, updates in the routing policy for a directional
    channel edge, and when channels are closed on-chain.
    */
    rpc SubscribeChannelGraph (GraphTopologySubscription)
        returns (stream GraphTopologyUpdate);

    /* lncli: `debuglevel`
    DebugLevel allows a caller to programmatically set the logging verbosity of
    lnd. The logging can be targeted according to a coarse daemon-wide logging
    level, or in a granular fashion to specify the logging for a target
    sub-system.
    */
    rpc DebugLevel (DebugLevelRequest) returns (DebugLevelResponse);

    /* lncli: `feereport`
    FeeReport allows the caller to obtain a report detailing the current fee
    schedule enforced by the node globally for each channel.
    */
    rpc FeeReport (FeeReportRequest) returns (FeeReportResponse);

    /* lncli: `updatechanpolicy`
    UpdateChannelPolicy allows the caller to update the fee schedule and
    channel policies for all channels globally, or a particular channel.
    */
    rpc UpdateChannelPolicy (PolicyUpdateRequest)
        returns (PolicyUpdateResponse);

    /* lncli: `fwdinghistory`
    ForwardingHistory allows the caller to query the htlcswitch for a record of
    all HTLCs forwarded within the target time range, and integer offset
    within that time range, for a maximum number of events. If no maximum number
    of events is specified, up to 100 events will be returned. If no time-range
    is specified, then events will be returned in the order that they occured.

    A list of forwarding events are returned. The size of each forwarding event
    is 40 bytes, and the max message size able to be returned in gRPC is 4 MiB.
    As a result each message can only contain 50k entries. Each response has
    the index offset of the last entry. The index offset can be provided to the
    request to allow the caller to skip a series of records.
    */
    rpc ForwardingHistory (ForwardingHistoryRequest)
        returns (ForwardingHistoryResponse);

    /* lncli: `exportchanbackup`
    ExportChannelBackup attempts to return an encrypted static channel backup
    for the target channel identified by it channel point. The backup is
    encrypted with a key generated from the aezeed seed of the user. The
    returned backup can either be restored using the RestoreChannelBackup
    method once lnd is running, or via the InitWallet and UnlockWallet methods
    from the WalletUnlocker service.
    */
    rpc ExportChannelBackup (ExportChannelBackupRequest)
        returns (ChannelBackup);

    /*
    ExportAllChannelBackups returns static channel backups for all existing
    channels known to lnd. A set of regular singular static channel backups for
    each channel are returned. Additionally, a multi-channel backup is returned
    as well, which contains a single encrypted blob containing the backups of
    each channel.
    */
    rpc ExportAllChannelBackups (ChanBackupExportRequest)
        returns (ChanBackupSnapshot);

    /*
    VerifyChanBackup allows a caller to verify the integrity of a channel backup
    snapshot. This method will accept either a packed Single or a packed Multi.
    Specifying both will result in an error.
    */
    rpc VerifyChanBackup (ChanBackupSnapshot)
        returns (VerifyChanBackupResponse);

    /* lncli: `restorechanbackup`
    RestoreChannelBackups accepts a set of singular channel backups, or a
    single encrypted multi-chan backup and attempts to recover any funds
    remaining within the channel. If we are able to unpack the backup, then the
    new channel will be shown under listchannels, as well as pending channels.
    */
    rpc RestoreChannelBackups (RestoreChanBackupRequest)
        returns (RestoreBackupResponse);

    /*
    SubscribeChannelBackups allows a client to sub-subscribe to the most up to
    date information concerning the state of all channel backups. Each time a
    new channel is added, we return the new set of channels, along with a
    multi-chan backup containing the backup info for all channels. Each time a
    channel is closed, we send a new update, which contains new new chan back
    ups, but the updated set of encrypted multi-chan backups with the closed
    channel(s) removed.
    */
    rpc SubscribeChannelBackups (ChannelBackupSubscription)
        returns (stream ChanBackupSnapshot);

    /* lncli: `bakemacaroon`
    BakeMacaroon allows the creation of a new macaroon with custom read and
    write permissions. No first-party caveats are added since this can be done
    offline.
    */
    rpc BakeMacaroon (BakeMacaroonRequest) returns (BakeMacaroonResponse);

    /* lncli: `listmacaroonids`
    ListMacaroonIDs returns all root key IDs that are in use.
    */
    rpc ListMacaroonIDs (ListMacaroonIDsRequest)
        returns (ListMacaroonIDsResponse);

    /* lncli: `deletemacaroonid`
    DeleteMacaroonID deletes the specified macaroon ID and invalidates all
    macaroons derived from that ID.
    */
    rpc DeleteMacaroonID (DeleteMacaroonIDRequest)
        returns (DeleteMacaroonIDResponse);

    /* lncli: `listpermissions`
    ListPermissions lists all RPC method URIs and their required macaroon
    permissions to access them.
    */
    rpc ListPermissions (ListPermissionsRequest)
        returns (ListPermissionsResponse);

    /*
    CheckMacaroonPermissions checks whether a request follows the constraints
    imposed on the macaroon and that the macaroon is authorized to follow the
    provided permissions.
    */
    rpc CheckMacaroonPermissions (CheckMacPermRequest)
        returns (CheckMacPermResponse);

    /*
    RegisterRPCMiddleware adds a new gRPC middleware to the interceptor chain. A
    gRPC middleware is software component external to lnd that aims to add
    additional business logic to lnd by observing/intercepting/validating
    incoming gRPC client requests and (if needed) replacing/overwriting outgoing
    messages before they're sent to the client. When registering the middleware
    must identify itself and indicate what custom macaroon caveats it wants to
    be responsible for. Only requests that contain a macaroon with that specific
    custom caveat are then sent to the middleware for inspection. The other
    option is to register for the read-only mode in which all requests/responses
    are forwarded for interception to the middleware but the middleware is not
    allowed to modify any responses. As a security measure, _no_ middleware can
    modify responses for requests made with _unencumbered_ macaroons!
    */
    rpc RegisterRPCMiddleware (stream RPCMiddlewareResponse)
        returns (stream RPCMiddlewareRequest);

    /* lncli: `sendcustom`
    SendCustomMessage sends a custom peer message.
    */
    rpc SendCustomMessage (SendCustomMessageRequest)
        returns (SendCustomMessageResponse);

    /* lncli: `subscribecustom`
    SubscribeCustomMessages subscribes to a stream of incoming custom peer
    messages.
    */
    rpc SubscribeCustomMessages (SubscribeCustomMessagesRequest)
        returns (stream CustomMessage);
}

message SubscribeCustomMessagesRequest {
}

message CustomMessage {
    // Peer from which the message originates
    bytes peer = 1;

    // Message type. This value will be in the custom range (>= 32768).
    uint32 type = 2;

    // Raw message data
    bytes data = 3;
}

message SendCustomMessageRequest {
    // Peer to send the message to
    bytes peer = 1;

    // Message type. This value needs to be in the custom range (>= 32768).
    uint32 type = 2;

    // Raw message data.
    bytes data = 3;
}

message SendCustomMessageResponse {
}

message Utxo {
    // The type of address
    AddressType address_type = 1;

    // The address
    string address = 2;

    // The value of the unspent coin in satoshis
    int64 amount_sat = 3;

    // The pkscript in hex
    string pk_script = 4;

    // The outpoint in format txid:n
    OutPoint outpoint = 5;

    // The number of confirmations for the Utxo
    int64 confirmations = 6;
}

message Transaction {
    // The transaction hash
    string tx_hash = 1;

    // The transaction amount, denominated in satoshis
    int64 amount = 2;

    // The number of confirmations
    int32 num_confirmations = 3;

    // The hash of the block this transaction was included in
    string block_hash = 4;

    // The height of the block this transaction was included in
    int32 block_height = 5;

    // Timestamp of this transaction
    int64 time_stamp = 6;

    // Fees paid for this transaction
    int64 total_fees = 7;

    // Addresses that received funds for this transaction
    repeated string dest_addresses = 8;

    // The raw transaction hex.
    string raw_tx_hex = 9;

    // A label that was optionally set on transaction broadcast.
    string label = 10;
}
message GetTransactionsRequest {
    /*
    The height from which to list transactions, inclusive. If this value is
    greater than end_height, transactions will be read in reverse.
    */
    int32 start_height = 1;

    /*
    The height until which to list transactions, inclusive. To include
    unconfirmed transactions, this value should be set to -1, which will
    return transactions from start_height until the current chain tip and
    unconfirmed transactions. If no end_height is provided, the call will
    default to this option.
    */
    int32 end_height = 2;

    // An optional filter to only include transactions relevant to an account.
    string account = 3;
}

message TransactionDetails {
    // The list of transactions relevant to the wallet.
    repeated Transaction transactions = 1;
}

message FeeLimit {
    oneof limit {
        /*
        The fee limit expressed as a fixed amount of satoshis.

        The fields fixed and fixed_msat are mutually exclusive.
        */
        int64 fixed = 1;

        /*
        The fee limit expressed as a fixed amount of millisatoshis.

        The fields fixed and fixed_msat are mutually exclusive.
        */
        int64 fixed_msat = 3;

        // The fee limit expressed as a percentage of the payment amount.
        int64 percent = 2;
    }
}

message SendRequest {
    /*
    The identity pubkey of the payment recipient. When using REST, this field
    must be encoded as base64.
    */
    bytes dest = 1;

    /*
    The hex-encoded identity pubkey of the payment recipient. Deprecated now
    that the REST gateway supports base64 encoding of bytes fields.
    */
    string dest_string = 2 [deprecated = true];

    /*
    The amount to send expressed in satoshis.

    The fields amt and amt_msat are mutually exclusive.
    */
    int64 amt = 3;

    /*
    The amount to send expressed in millisatoshis.

    The fields amt and amt_msat are mutually exclusive.
    */
    int64 amt_msat = 12;

    /*
    The hash to use within the payment's HTLC. When using REST, this field
    must be encoded as base64.
    */
    bytes payment_hash = 4;

    /*
    The hex-encoded hash to use within the payment's HTLC. Deprecated now
    that the REST gateway supports base64 encoding of bytes fields.
    */
    string payment_hash_string = 5 [deprecated = true];

    /*
    A bare-bones invoice for a payment within the Lightning Network. With the
    details of the invoice, the sender has all the data necessary to send a
    payment to the recipient.
    */
    string payment_request = 6;

    /*
    The CLTV delta from the current height that should be used to set the
    timelock for the final hop.
    */
    int32 final_cltv_delta = 7;

    /*
    The maximum number of satoshis that will be paid as a fee of the payment.
    This value can be represented either as a percentage of the amount being
    sent, or as a fixed amount of the maximum fee the user is willing the pay to
    send the payment.
    */
    FeeLimit fee_limit = 8;

    /*
    The channel id of the channel that must be taken to the first hop. If zero,
    any channel may be used.
    */
    uint64 outgoing_chan_id = 9 [jstype = JS_STRING];

    /*
    The pubkey of the last hop of the route. If empty, any hop may be used.
    */
    bytes last_hop_pubkey = 13;

    /*
    An optional maximum total time lock for the route. This should not exceed
    lnd's `--max-cltv-expiry` setting. If zero, then the value of
    `--max-cltv-expiry` is enforced.
    */
    uint32 cltv_limit = 10;

    /*
    An optional field that can be used to pass an arbitrary set of TLV records
    to a peer which understands the new records. This can be used to pass
    application specific data during the payment attempt. Record types are
    required to be in the custom range >= 65536. When using REST, the values
    must be encoded as base64.
    */
    map<uint64, bytes> dest_custom_records = 11;

    // If set, circular payments to self are permitted.
    bool allow_self_payment = 14;

    /*
    Features assumed to be supported by the final node. All transitive feature
    dependencies must also be set properly. For a given feature bit pair, either
    optional or remote may be set, but not both. If this field is nil or empty,
    the router will try to load destination features from the graph as a
    fallback.
    */
    repeated FeatureBit dest_features = 15;

    /*
    The payment address of the generated invoice.
    */
    bytes payment_addr = 16;
}

message SendResponse {
    string payment_error = 1;
    bytes payment_preimage = 2;
    Route payment_route = 3;
    bytes payment_hash = 4;
}

message SendToRouteRequest {
    /*
    The payment hash to use for the HTLC. When using REST, this field must be
    encoded as base64.
    */
    bytes payment_hash = 1;

    /*
    An optional hex-encoded payment hash to be used for the HTLC. Deprecated now
    that the REST gateway supports base64 encoding of bytes fields.
    */
    string payment_hash_string = 2 [deprecated = true];

    reserved 3;

    // Route that should be used to attempt to complete the payment.
    Route route = 4;
}

message ChannelAcceptRequest {
    // The pubkey of the node that wishes to open an inbound channel.
    bytes node_pubkey = 1;

    // The hash of the genesis block that the proposed channel resides in.
    bytes chain_hash = 2;

    // The pending channel id.
    bytes pending_chan_id = 3;

    // The funding amount in satoshis that initiator wishes to use in the
    // channel.
    uint64 funding_amt = 4;

    // The push amount of the proposed channel in millisatoshis.
    uint64 push_amt = 5;

    // The dust limit of the initiator's commitment tx.
    uint64 dust_limit = 6;

    // The maximum amount of coins in millisatoshis that can be pending in this
    // channel.
    uint64 max_value_in_flight = 7;

    // The minimum amount of satoshis the initiator requires us to have at all
    // times.
    uint64 channel_reserve = 8;

    // The smallest HTLC in millisatoshis that the initiator will accept.
    uint64 min_htlc = 9;

    // The initial fee rate that the initiator suggests for both commitment
    // transactions.
    uint64 fee_per_kw = 10;

    /*
    The number of blocks to use for the relative time lock in the pay-to-self
    output of both commitment transactions.
    */
    uint32 csv_delay = 11;

    // The total number of incoming HTLC's that the initiator will accept.
    uint32 max_accepted_htlcs = 12;

    // A bit-field which the initiator uses to specify proposed channel
    // behavior.
    uint32 channel_flags = 13;

    // The commitment type the initiator wishes to use for the proposed channel.
    CommitmentType commitment_type = 14;
}

message ChannelAcceptResponse {
    // Whether or not the client accepts the channel.
    bool accept = 1;

    // The pending channel id to which this response applies.
    bytes pending_chan_id = 2;

    /*
    An optional error to send the initiating party to indicate why the channel
    was rejected. This field *should not* contain sensitive information, it will
    be sent to the initiating party. This field should only be set if accept is
    false, the channel will be rejected if an error is set with accept=true
    because the meaning of this response is ambiguous. Limited to 500
    characters.
    */
    string error = 3;

    /*
    The upfront shutdown address to use if the initiating peer supports option
    upfront shutdown script (see ListPeers for the features supported). Note
    that the channel open will fail if this value is set for a peer that does
    not support this feature bit.
    */
    string upfront_shutdown = 4;

    /*
    The csv delay (in blocks) that we require for the remote party.
    */
    uint32 csv_delay = 5;

    /*
    The reserve amount in satoshis that we require the remote peer to adhere to.
    We require that the remote peer always have some reserve amount allocated to
    them so that there is always a disincentive to broadcast old state (if they
    hold 0 sats on their side of the channel, there is nothing to lose).
    */
    uint64 reserve_sat = 6;

    /*
    The maximum amount of funds in millisatoshis that we allow the remote peer
    to have in outstanding htlcs.
    */
    uint64 in_flight_max_msat = 7;

    /*
    The maximum number of htlcs that the remote peer can offer us.
    */
    uint32 max_htlc_count = 8;

    /*
    The minimum value in millisatoshis for incoming htlcs on the channel.
    */
    uint64 min_htlc_in = 9;

    /*
    The number of confirmations we require before we consider the channel open.
    */
    uint32 min_accept_depth = 10;
}

message ChannelPoint {
    oneof funding_txid {
        /*
        Txid of the funding transaction. When using REST, this field must be
        encoded as base64.
        */
        bytes funding_txid_bytes = 1;

        /*
        Hex-encoded string representing the byte-reversed hash of the funding
        transaction.
        */
        string funding_txid_str = 2;
    }

    // The index of the output of the funding transaction
    uint32 output_index = 3;
}

message OutPoint {
    // Raw bytes representing the transaction id.
    bytes txid_bytes = 1;

    // Reversed, hex-encoded string representing the transaction id.
    string txid_str = 2;

    // The index of the output on the transaction.
    uint32 output_index = 3;
}

message LightningAddress {
    // The identity pubkey of the Lightning node
    string pubkey = 1;

    // The network location of the lightning node, e.g. `69.69.69.69:1337` or
    // `localhost:10011`
    string host = 2;
}

message EstimateFeeRequest {
    // The map from addresses to amounts for the transaction.
    map<string, int64> AddrToAmount = 1;

    // The target number of blocks that this transaction should be confirmed
    // by.
    int32 target_conf = 2;

    // The minimum number of confirmations each one of your outputs used for
    // the transaction must satisfy.
    int32 min_confs = 3;

    // Whether unconfirmed outputs should be used as inputs for the transaction.
    bool spend_unconfirmed = 4;
}

message EstimateFeeResponse {
    // The total fee in satoshis.
    int64 fee_sat = 1;

    // Deprecated, use sat_per_vbyte.
    // The fee rate in satoshi/vbyte.
    int64 feerate_sat_per_byte = 2 [deprecated = true];

    // The fee rate in satoshi/vbyte.
    uint64 sat_per_vbyte = 3;
}

message SendManyRequest {
    // The map from addresses to amounts
    map<string, int64> AddrToAmount = 1;

    // The target number of blocks that this transaction should be confirmed
    // by.
    int32 target_conf = 3;

    // A manual fee rate set in sat/vbyte that should be used when crafting the
    // transaction.
    uint64 sat_per_vbyte = 4;

    // Deprecated, use sat_per_vbyte.
    // A manual fee rate set in sat/vbyte that should be used when crafting the
    // transaction.
    int64 sat_per_byte = 5 [deprecated = true];

    // An optional label for the transaction, limited to 500 characters.
    string label = 6;

    // The minimum number of confirmations each one of your outputs used for
    // the transaction must satisfy.
    int32 min_confs = 7;

    // Whether unconfirmed outputs should be used as inputs for the transaction.
    bool spend_unconfirmed = 8;
}
message SendManyResponse {
    // The id of the transaction
    string txid = 1;
}

message SendCoinsRequest {
    // The address to send coins to
    string addr = 1;

    // The amount in satoshis to send
    int64 amount = 2;

    // The target number of blocks that this transaction should be confirmed
    // by.
    int32 target_conf = 3;

    // A manual fee rate set in sat/vbyte that should be used when crafting the
    // transaction.
    uint64 sat_per_vbyte = 4;

    // Deprecated, use sat_per_vbyte.
    // A manual fee rate set in sat/vbyte that should be used when crafting the
    // transaction.
    int64 sat_per_byte = 5 [deprecated = true];

    /*
    If set, then the amount field will be ignored, and lnd will attempt to
    send all the coins under control of the internal wallet to the specified
    address.
    */
    bool send_all = 6;

    // An optional label for the transaction, limited to 500 characters.
    string label = 7;

    // The minimum number of confirmations each one of your outputs used for
    // the transaction must satisfy.
    int32 min_confs = 8;

    // Whether unconfirmed outputs should be used as inputs for the transaction.
    bool spend_unconfirmed = 9;
}
message SendCoinsResponse {
    // The transaction ID of the transaction
    string txid = 1;
}

message ListUnspentRequest {
    // The minimum number of confirmations to be included.
    int32 min_confs = 1;

    // The maximum number of confirmations to be included.
    int32 max_confs = 2;

    // An optional filter to only include outputs belonging to an account.
    string account = 3;
}
message ListUnspentResponse {
    // A list of utxos
    repeated Utxo utxos = 1;
}

/*
`AddressType` has to be one of:

- `p2wkh`: Pay to witness key hash (`WITNESS_PUBKEY_HASH` = 0)
- `np2wkh`: Pay to nested witness key hash (`NESTED_PUBKEY_HASH` = 1)
*/
enum AddressType {
    WITNESS_PUBKEY_HASH = 0;
    NESTED_PUBKEY_HASH = 1;
    UNUSED_WITNESS_PUBKEY_HASH = 2;
    UNUSED_NESTED_PUBKEY_HASH = 3;
}

message NewAddressRequest {
    // The type of address to generate.
    AddressType type = 1;

    /*
    The name of the account to generate a new address for. If empty, the
    default wallet account is used.
    */
    string account = 2;
}
message NewAddressResponse {
    // The newly generated wallet address
    string address = 1;
}

message SignMessageRequest {
    /*
    The message to be signed. When using REST, this field must be encoded as
    base64.
    */
    bytes msg = 1;

    /*
    Instead of the default double-SHA256 hashing of the message before signing,
    only use one round of hashing instead.
    */
    bool single_hash = 2;
}
message SignMessageResponse {
    // The signature for the given message
    string signature = 1;
}

message VerifyMessageRequest {
    /*
    The message over which the signature is to be verified. When using REST,
    this field must be encoded as base64.
    */
    bytes msg = 1;

    // The signature to be verified over the given message
    string signature = 2;
}
message VerifyMessageResponse {
    // Whether the signature was valid over the given message
    bool valid = 1;

    // The pubkey recovered from the signature
    string pubkey = 2;
}

message ConnectPeerRequest {
    // Lightning address of the peer, in the format `<pubkey>@host`
    LightningAddress addr = 1;

    /* If set, the daemon will attempt to persistently connect to the target
     * peer. Otherwise, the call will be synchronous. */
    bool perm = 2;

    /*
    The connection timeout value (in seconds) for this request. It won't affect
    other requests.
    */
    uint64 timeout = 3;
}
message ConnectPeerResponse {
}

message DisconnectPeerRequest {
    // The pubkey of the node to disconnect from
    string pub_key = 1;
}
message DisconnectPeerResponse {
}

message HTLC {
    bool incoming = 1;
    int64 amount = 2;
    bytes hash_lock = 3;
    uint32 expiration_height = 4;

    // Index identifying the htlc on the channel.
    uint64 htlc_index = 5;

    // If this HTLC is involved in a forwarding operation, this field indicates
    // the forwarding channel. For an outgoing htlc, it is the incoming channel.
    // For an incoming htlc, it is the outgoing channel. When the htlc
    // originates from this node or this node is the final destination,
    // forwarding_channel will be zero. The forwarding channel will also be zero
    // for htlcs that need to be forwarded but don't have a forwarding decision
    // persisted yet.
    uint64 forwarding_channel = 6;

    // Index identifying the htlc on the forwarding channel.
    uint64 forwarding_htlc_index = 7;
}

enum CommitmentType {
    /*
    Returned when the commitment type isn't known or unavailable.
    */
    UNKNOWN_COMMITMENT_TYPE = 999;

    /*
    A channel using the legacy commitment format having tweaked to_remote
    keys.
    */
    LEGACY = 0;

    /*
    A channel that uses the modern commitment format where the key in the
    output of the remote party does not change each state. This makes back
    up and recovery easier as when the channel is closed, the funds go
    directly to that key.
    */
    STATIC_REMOTE_KEY = 1;

    /*
    A channel that uses a commitment format that has anchor outputs on the
    commitments, allowing fee bumping after a force close transaction has
    been broadcast.
    */
    ANCHORS = 2;

    /*
    A channel that uses a commitment type that builds upon the anchors
    commitment format, but in addition requires a CLTV clause to spend outputs
    paying to the channel initiator. This is intended for use on leased channels
    to guarantee that the channel initiator has no incentives to close a leased
    channel before its maturity date.
    */
    SCRIPT_ENFORCED_LEASE = 4;
}

message ChannelConstraints {
    /*
    The CSV delay expressed in relative blocks. If the channel is force closed,
    we will need to wait for this many blocks before we can regain our funds.
    */
    uint32 csv_delay = 1;

    // The minimum satoshis this node is required to reserve in its balance.
    uint64 chan_reserve_sat = 2;

    // The dust limit (in satoshis) of the initiator's commitment tx.
    uint64 dust_limit_sat = 3;

    // The maximum amount of coins in millisatoshis that can be pending in this
    // channel.
    uint64 max_pending_amt_msat = 4;

    // The smallest HTLC in millisatoshis that the initiator will accept.
    uint64 min_htlc_msat = 5;

    // The total number of incoming HTLC's that the initiator will accept.
    uint32 max_accepted_htlcs = 6;
}

message Channel {
    // Whether this channel is active or not
    bool active = 1;

    // The identity pubkey of the remote node
    string remote_pubkey = 2;

    /*
    The outpoint (txid:index) of the funding transaction. With this value, Bob
    will be able to generate a signature for Alice's version of the commitment
    transaction.
    */
    string channel_point = 3;

    /*
    The unique channel ID for the channel. The first 3 bytes are the block
    height, the next 3 the index within the block, and the last 2 bytes are the
    output index for the channel.
    */
    uint64 chan_id = 4 [jstype = JS_STRING];

    // The total amount of funds held in this channel
    int64 capacity = 5;

    // This node's current balance in this channel
    int64 local_balance = 6;

    // The counterparty's current balance in this channel
    int64 remote_balance = 7;

    /*
    The amount calculated to be paid in fees for the current set of commitment
    transactions. The fee amount is persisted with the channel in order to
    allow the fee amount to be removed and recalculated with each channel state
    update, including updates that happen after a system restart.
    */
    int64 commit_fee = 8;

    // The weight of the commitment transaction
    int64 commit_weight = 9;

    /*
    The required number of satoshis per kilo-weight that the requester will pay
    at all times, for both the funding transaction and commitment transaction.
    This value can later be updated once the channel is open.
    */
    int64 fee_per_kw = 10;

    // The unsettled balance in this channel
    int64 unsettled_balance = 11;

    /*
    The total number of satoshis we've sent within this channel.
    */
    int64 total_satoshis_sent = 12;

    /*
    The total number of satoshis we've received within this channel.
    */
    int64 total_satoshis_received = 13;

    /*
    The total number of updates conducted within this channel.
    */
    uint64 num_updates = 14;

    /*
    The list of active, uncleared HTLCs currently pending within the channel.
    */
    repeated HTLC pending_htlcs = 15;

    /*
    Deprecated. The CSV delay expressed in relative blocks. If the channel is
    force closed, we will need to wait for this many blocks before we can regain
    our funds.
    */
    uint32 csv_delay = 16 [deprecated = true];

    // Whether this channel is advertised to the network or not.
    bool private = 17;

    // True if we were the ones that created the channel.
    bool initiator = 18;

    // A set of flags showing the current state of the channel.
    string chan_status_flags = 19;

    // Deprecated. The minimum satoshis this node is required to reserve in its
    // balance.
    int64 local_chan_reserve_sat = 20 [deprecated = true];

    /*
    Deprecated. The minimum satoshis the other node is required to reserve in
    its balance.
    */
    int64 remote_chan_reserve_sat = 21 [deprecated = true];

    // Deprecated. Use commitment_type.
    bool static_remote_key = 22 [deprecated = true];

    // The commitment type used by this channel.
    CommitmentType commitment_type = 26;

    /*
    The number of seconds that the channel has been monitored by the channel
    scoring system. Scores are currently not persisted, so this value may be
    less than the lifetime of the channel [EXPERIMENTAL].
    */
    int64 lifetime = 23;

    /*
    The number of seconds that the remote peer has been observed as being online
    by the channel scoring system over the lifetime of the channel
    [EXPERIMENTAL].
    */
    int64 uptime = 24;

    /*
    Close address is the address that we will enforce payout to on cooperative
    close if the channel was opened utilizing option upfront shutdown. This
    value can be set on channel open by setting close_address in an open channel
    request. If this value is not set, you can still choose a payout address by
    cooperatively closing with the delivery_address field set.
    */
    string close_address = 25;

    /*
    The amount that the initiator of the channel optionally pushed to the remote
    party on channel open. This amount will be zero if the channel initiator did
    not push any funds to the remote peer. If the initiator field is true, we
    pushed this amount to our peer, if it is false, the remote peer pushed this
    amount to us.
    */
    uint64 push_amount_sat = 27;

    /*
    This uint32 indicates if this channel is to be considered 'frozen'. A
    frozen channel doest not allow a cooperative channel close by the
    initiator. The thaw_height is the height that this restriction stops
    applying to the channel. This field is optional, not setting it or using a
    value of zero will mean the channel has no additional restrictions. The
    height can be interpreted in two ways: as a relative height if the value is
    less than 500,000, or as an absolute height otherwise.
    */
    uint32 thaw_height = 28;

    // List constraints for the local node.
    ChannelConstraints local_constraints = 29;

    // List constraints for the remote node.
    ChannelConstraints remote_constraints = 30;
}

message ListChannelsRequest {
    bool active_only = 1;
    bool inactive_only = 2;
    bool public_only = 3;
    bool private_only = 4;

    /*
    Filters the response for channels with a target peer's pubkey. If peer is
    empty, all channels will be returned.
    */
    bytes peer = 5;
}
message ListChannelsResponse {
    // The list of active channels
    repeated Channel channels = 11;
}

enum Initiator {
    INITIATOR_UNKNOWN = 0;
    INITIATOR_LOCAL = 1;
    INITIATOR_REMOTE = 2;
    INITIATOR_BOTH = 3;
}

message ChannelCloseSummary {
    // The outpoint (txid:index) of the funding transaction.
    string channel_point = 1;

    //  The unique channel ID for the channel.
    uint64 chan_id = 2 [jstype = JS_STRING];

    // The hash of the genesis block that this channel resides within.
    string chain_hash = 3;

    // The txid of the transaction which ultimately closed this channel.
    string closing_tx_hash = 4;

    // Public key of the remote peer that we formerly had a channel with.
    string remote_pubkey = 5;

    // Total capacity of the channel.
    int64 capacity = 6;

    // Height at which the funding transaction was spent.
    uint32 close_height = 7;

    // Settled balance at the time of channel closure
    int64 settled_balance = 8;

    // The sum of all the time-locked outputs at the time of channel closure
    int64 time_locked_balance = 9;

    enum ClosureType {
        COOPERATIVE_CLOSE = 0;
        LOCAL_FORCE_CLOSE = 1;
        REMOTE_FORCE_CLOSE = 2;
        BREACH_CLOSE = 3;
        FUNDING_CANCELED = 4;
        ABANDONED = 5;
    }

    // Details on how the channel was closed.
    ClosureType close_type = 10;

    /*
    Open initiator is the party that initiated opening the channel. Note that
    this value may be unknown if the channel was closed before we migrated to
    store open channel information after close.
    */
    Initiator open_initiator = 11;

    /*
    Close initiator indicates which party initiated the close. This value will
    be unknown for channels that were cooperatively closed before we started
    tracking cooperative close initiators. Note that this indicates which party
    initiated a close, and it is possible for both to initiate cooperative or
    force closes, although only one party's close will be confirmed on chain.
    */
    Initiator close_initiator = 12;

    repeated Resolution resolutions = 13;
}

enum ResolutionType {
    TYPE_UNKNOWN = 0;

    // We resolved an anchor output.
    ANCHOR = 1;

    /*
    We are resolving an incoming htlc on chain. This if this htlc is
    claimed, we swept the incoming htlc with the preimage. If it is timed
    out, our peer swept the timeout path.
    */
    INCOMING_HTLC = 2;

    /*
    We are resolving an outgoing htlc on chain. If this htlc is claimed,
    the remote party swept the htlc with the preimage. If it is timed out,
    we swept it with the timeout path.
    */
    OUTGOING_HTLC = 3;

    // We force closed and need to sweep our time locked commitment output.
    COMMIT = 4;
}

enum ResolutionOutcome {
    // Outcome unknown.
    OUTCOME_UNKNOWN = 0;

    // An output was claimed on chain.
    CLAIMED = 1;

    // An output was left unclaimed on chain.
    UNCLAIMED = 2;

    /*
    ResolverOutcomeAbandoned indicates that an output that we did not
    claim on chain, for example an anchor that we did not sweep and a
    third party claimed on chain, or a htlc that we could not decode
    so left unclaimed.
    */
    ABANDONED = 3;

    /*
    If we force closed our channel, our htlcs need to be claimed in two
    stages. This outcome represents the broadcast of a timeout or success
    transaction for this two stage htlc claim.
    */
    FIRST_STAGE = 4;

    // A htlc was timed out on chain.
    TIMEOUT = 5;
}

message Resolution {
    // The type of output we are resolving.
    ResolutionType resolution_type = 1;

    // The outcome of our on chain action that resolved the outpoint.
    ResolutionOutcome outcome = 2;

    // The outpoint that was spent by the resolution.
    OutPoint outpoint = 3;

    // The amount that was claimed by the resolution.
    uint64 amount_sat = 4;

    // The hex-encoded transaction ID of the sweep transaction that spent the
    // output.
    string sweep_txid = 5;
}

message ClosedChannelsRequest {
    bool cooperative = 1;
    bool local_force = 2;
    bool remote_force = 3;
    bool breach = 4;
    bool funding_canceled = 5;
    bool abandoned = 6;
}

message ClosedChannelsResponse {
    repeated ChannelCloseSummary channels = 1;
}

message Peer {
    // The identity pubkey of the peer
    string pub_key = 1;

    // Network address of the peer; eg `127.0.0.1:10011`
    string address = 3;

    // Bytes of data transmitted to this peer
    uint64 bytes_sent = 4;

    // Bytes of data transmitted from this peer
    uint64 bytes_recv = 5;

    // Satoshis sent to this peer
    int64 sat_sent = 6;

    // Satoshis received from this peer
    int64 sat_recv = 7;

    // A channel is inbound if the counterparty initiated the channel
    bool inbound = 8;

    // Ping time to this peer
    int64 ping_time = 9;

    enum SyncType {
        /*
        Denotes that we cannot determine the peer's current sync type.
        */
        UNKNOWN_SYNC = 0;

        /*
        Denotes that we are actively receiving new graph updates from the peer.
        */
        ACTIVE_SYNC = 1;

        /*
        Denotes that we are not receiving new graph updates from the peer.
        */
        PASSIVE_SYNC = 2;

        /*
        Denotes that this peer is pinned into an active sync.
        */
        PINNED_SYNC = 3;
    }

    // The type of sync we are currently performing with this peer.
    SyncType sync_type = 10;

    // Features advertised by the remote peer in their init message.
    map<uint32, Feature> features = 11;

    /*
    The latest errors received from our peer with timestamps, limited to the 10
    most recent errors. These errors are tracked across peer connections, but
    are not persisted across lnd restarts. Note that these errors are only
    stored for peers that we have channels open with, to prevent peers from
    spamming us with errors at no cost.
    */
    repeated TimestampedError errors = 12;

    /*
    The number of times we have recorded this peer going offline or coming
    online, recorded across restarts. Note that this value is decreased over
    time if the peer has not recently flapped, so that we can forgive peers
    with historically high flap counts.
    */
    int32 flap_count = 13;

    /*
    The timestamp of the last flap we observed for this peer. If this value is
    zero, we have not observed any flaps for this peer.
    */
    int64 last_flap_ns = 14;

    /*
    The last ping payload the peer has sent to us.
    */
    bytes last_ping_payload = 15;
}

message TimestampedError {
    // The unix timestamp in seconds when the error occurred.
    uint64 timestamp = 1;

    // The string representation of the error sent by our peer.
    string error = 2;
}

message ListPeersRequest {
    /*
    If true, only the last error that our peer sent us will be returned with
    the peer's information, rather than the full set of historic errors we have
    stored.
    */
    bool latest_error = 1;
}
message ListPeersResponse {
    // The list of currently connected peers
    repeated Peer peers = 1;
}

message PeerEventSubscription {
}

message PeerEvent {
    // The identity pubkey of the peer.
    string pub_key = 1;

    enum EventType {
        PEER_ONLINE = 0;
        PEER_OFFLINE = 1;
    }

    EventType type = 2;
}

message GetInfoRequest {
}
message GetInfoResponse {
    // The version of the LND software that the node is running.
    string version = 14;

    // The SHA1 commit hash that the daemon is compiled with.
    string commit_hash = 20;

    // The identity pubkey of the current node.
    string identity_pubkey = 1;

    // If applicable, the alias of the current node, e.g. "bob"
    string alias = 2;

    // The color of the current node in hex code format
    string color = 17;

    // Number of pending channels
    uint32 num_pending_channels = 3;

    // Number of active channels
    uint32 num_active_channels = 4;

    // Number of inactive channels
    uint32 num_inactive_channels = 15;

    // Number of peers
    uint32 num_peers = 5;

    // The node's current view of the height of the best block
    uint32 block_height = 6;

    // The node's current view of the hash of the best block
    string block_hash = 8;

    // Timestamp of the block best known to the wallet
    int64 best_header_timestamp = 13;

    // Whether the wallet's view is synced to the main chain
    bool synced_to_chain = 9;

    // Whether we consider ourselves synced with the public channel graph.
    bool synced_to_graph = 18;

    /*
    Whether the current node is connected to testnet. This field is
    deprecated and the network field should be used instead
    **/
    bool testnet = 10 [deprecated = true];

    reserved 11;

    // A list of active chains the node is connected to
    repeated Chain chains = 16;

    // The URIs of the current node.
    repeated string uris = 12;

    /*
    Features that our node has advertised in our init message, node
    announcements and invoices.
    */
    map<uint32, Feature> features = 19;
}

message GetRecoveryInfoRequest {
}
message GetRecoveryInfoResponse {
    // Whether the wallet is in recovery mode
    bool recovery_mode = 1;

    // Whether the wallet recovery progress is finished
    bool recovery_finished = 2;

    // The recovery progress, ranging from 0 to 1.
    double progress = 3;
}

message Chain {
    // The blockchain the node is on (eg bitcoin, litecoin)
    string chain = 1;

    // The network the node is on (eg regtest, testnet, mainnet)
    string network = 2;
}

message ConfirmationUpdate {
    bytes block_sha = 1;
    int32 block_height = 2;

    uint32 num_confs_left = 3;
}

message ChannelOpenUpdate {
    ChannelPoint channel_point = 1;
}

message ChannelCloseUpdate {
    bytes closing_txid = 1;

    bool success = 2;
}

message CloseChannelRequest {
    /*
    The outpoint (txid:index) of the funding transaction. With this value, Bob
    will be able to generate a signature for Alice's version of the commitment
    transaction.
    */
    ChannelPoint channel_point = 1;

    // If true, then the channel will be closed forcibly. This means the
    // current commitment transaction will be signed and broadcast.
    bool force = 2;

    // The target number of blocks that the closure transaction should be
    // confirmed by.
    int32 target_conf = 3;

    // Deprecated, use sat_per_vbyte.
    // A manual fee rate set in sat/vbyte that should be used when crafting the
    // closure transaction.
    int64 sat_per_byte = 4 [deprecated = true];

    /*
    An optional address to send funds to in the case of a cooperative close.
    If the channel was opened with an upfront shutdown script and this field
    is set, the request to close will fail because the channel must pay out
    to the upfront shutdown addresss.
    */
    string delivery_address = 5;

    // A manual fee rate set in sat/vbyte that should be used when crafting the
    // closure transaction.
    uint64 sat_per_vbyte = 6;
}

message CloseStatusUpdate {
    oneof update {
        PendingUpdate close_pending = 1;
        ChannelCloseUpdate chan_close = 3;
    }
}

message PendingUpdate {
    bytes txid = 1;
    uint32 output_index = 2;
}

message ReadyForPsbtFunding {
    /*
    The P2WSH address of the channel funding multisig address that the below
    specified amount in satoshis needs to be sent to.
    */
    string funding_address = 1;

    /*
    The exact amount in satoshis that needs to be sent to the above address to
    fund the pending channel.
    */
    int64 funding_amount = 2;

    /*
    A raw PSBT that contains the pending channel output. If a base PSBT was
    provided in the PsbtShim, this is the base PSBT with one additional output.
    If no base PSBT was specified, this is an otherwise empty PSBT with exactly
    one output.
    */
    bytes psbt = 3;
}

message BatchOpenChannelRequest {
    // The list of channels to open.
    repeated BatchOpenChannel channels = 1;

    // The target number of blocks that the funding transaction should be
    // confirmed by.
    int32 target_conf = 2;

    // A manual fee rate set in sat/vByte that should be used when crafting the
    // funding transaction.
    int64 sat_per_vbyte = 3;

    // The minimum number of confirmations each one of your outputs used for
    // the funding transaction must satisfy.
    int32 min_confs = 4;

    // Whether unconfirmed outputs should be used as inputs for the funding
    // transaction.
    bool spend_unconfirmed = 5;

    // An optional label for the batch transaction, limited to 500 characters.
    string label = 6;
}

message BatchOpenChannel {
    // The pubkey of the node to open a channel with. When using REST, this
    // field must be encoded as base64.
    bytes node_pubkey = 1;

    // The number of satoshis the wallet should commit to the channel.
    int64 local_funding_amount = 2;

    // The number of satoshis to push to the remote side as part of the initial
    // commitment state.
    int64 push_sat = 3;

    // Whether this channel should be private, not announced to the greater
    // network.
    bool private = 4;

    // The minimum value in millisatoshi we will require for incoming HTLCs on
    // the channel.
    int64 min_htlc_msat = 5;

    // The delay we require on the remote's commitment transaction. If this is
    // not set, it will be scaled automatically with the channel size.
    uint32 remote_csv_delay = 6;

    /*
    Close address is an optional address which specifies the address to which
    funds should be paid out to upon cooperative close. This field may only be
    set if the peer supports the option upfront feature bit (call listpeers
    to check). The remote peer will only accept cooperative closes to this
    address if it is set.

    Note: If this value is set on channel creation, you will *not* be able to
    cooperatively close out to a different address.
    */
    string close_address = 7;

    /*
    An optional, unique identifier of 32 random bytes that will be used as the
    pending channel ID to identify the channel while it is in the pre-pending
    state.
    */
    bytes pending_chan_id = 8;

    /*
    The explicit commitment type to use. Note this field will only be used if
    the remote peer supports explicit channel negotiation.
    */
    CommitmentType commitment_type = 9;
}

message BatchOpenChannelResponse {
    repeated PendingUpdate pending_channels = 1;
}

message OpenChannelRequest {
    // A manual fee rate set in sat/vbyte that should be used when crafting the
    // funding transaction.
    uint64 sat_per_vbyte = 1;

    /*
    The pubkey of the node to open a channel with. When using REST, this field
    must be encoded as base64.
    */
    bytes node_pubkey = 2;

    /*
    The hex encoded pubkey of the node to open a channel with. Deprecated now
    that the REST gateway supports base64 encoding of bytes fields.
    */
    string node_pubkey_string = 3 [deprecated = true];

    // The number of satoshis the wallet should commit to the channel
    int64 local_funding_amount = 4;

    // The number of satoshis to push to the remote side as part of the initial
    // commitment state
    int64 push_sat = 5;

    // The target number of blocks that the funding transaction should be
    // confirmed by.
    int32 target_conf = 6;

    // Deprecated, use sat_per_vbyte.
    // A manual fee rate set in sat/vbyte that should be used when crafting the
    // funding transaction.
    int64 sat_per_byte = 7 [deprecated = true];

    // Whether this channel should be private, not announced to the greater
    // network.
    bool private = 8;

    // The minimum value in millisatoshi we will require for incoming HTLCs on
    // the channel.
    int64 min_htlc_msat = 9;

    // The delay we require on the remote's commitment transaction. If this is
    // not set, it will be scaled automatically with the channel size.
    uint32 remote_csv_delay = 10;

    // The minimum number of confirmations each one of your outputs used for
    // the funding transaction must satisfy.
    int32 min_confs = 11;

    // Whether unconfirmed outputs should be used as inputs for the funding
    // transaction.
    bool spend_unconfirmed = 12;

    /*
    Close address is an optional address which specifies the address to which
    funds should be paid out to upon cooperative close. This field may only be
    set if the peer supports the option upfront feature bit (call listpeers
    to check). The remote peer will only accept cooperative closes to this
    address if it is set.

    Note: If this value is set on channel creation, you will *not* be able to
    cooperatively close out to a different address.
    */
    string close_address = 13;

    /*
    Funding shims are an optional argument that allow the caller to intercept
    certain funding functionality. For example, a shim can be provided to use a
    particular key for the commitment key (ideally cold) rather than use one
    that is generated by the wallet as normal, or signal that signing will be
    carried out in an interactive manner (PSBT based).
    */
    FundingShim funding_shim = 14;

    /*
    The maximum amount of coins in millisatoshi that can be pending within
    the channel. It only applies to the remote party.
    */
    uint64 remote_max_value_in_flight_msat = 15;

    /*
    The maximum number of concurrent HTLCs we will allow the remote party to add
    to the commitment transaction.
    */
    uint32 remote_max_htlcs = 16;

    /*
    Max local csv is the maximum csv delay we will allow for our own commitment
    transaction.
    */
    uint32 max_local_csv = 17;

    /*
    The explicit commitment type to use. Note this field will only be used if
    the remote peer supports explicit channel negotiation.
    */
    CommitmentType commitment_type = 18;
}
message OpenStatusUpdate {
    oneof update {
        /*
        Signals that the channel is now fully negotiated and the funding
        transaction published.
        */
        PendingUpdate chan_pending = 1;

        /*
        Signals that the channel's funding transaction has now reached the
        required number of confirmations on chain and can be used.
        */
        ChannelOpenUpdate chan_open = 3;

        /*
        Signals that the funding process has been suspended and the construction
        of a PSBT that funds the channel PK script is now required.
        */
        ReadyForPsbtFunding psbt_fund = 5;
    }

    /*
    The pending channel ID of the created channel. This value may be used to
    further the funding flow manually via the FundingStateStep method.
    */
    bytes pending_chan_id = 4;
}

message KeyLocator {
    // The family of key being identified.
    int32 key_family = 1;

    // The precise index of the key being identified.
    int32 key_index = 2;
}

message KeyDescriptor {
    /*
    The raw bytes of the key being identified.
    */
    bytes raw_key_bytes = 1;

    /*
    The key locator that identifies which key to use for signing.
    */
    KeyLocator key_loc = 2;
}

message ChanPointShim {
    /*
    The size of the pre-crafted output to be used as the channel point for this
    channel funding.
    */
    int64 amt = 1;

    // The target channel point to refrence in created commitment transactions.
    ChannelPoint chan_point = 2;

    // Our local key to use when creating the multi-sig output.
    KeyDescriptor local_key = 3;

    // The key of the remote party to use when creating the multi-sig output.
    bytes remote_key = 4;

    /*
    If non-zero, then this will be used as the pending channel ID on the wire
    protocol to initate the funding request. This is an optional field, and
    should only be set if the responder is already expecting a specific pending
    channel ID.
    */
    bytes pending_chan_id = 5;

    /*
    This uint32 indicates if this channel is to be considered 'frozen'. A frozen
    channel does not allow a cooperative channel close by the initiator. The
    thaw_height is the height that this restriction stops applying to the
    channel. The height can be interpreted in two ways: as a relative height if
    the value is less than 500,000, or as an absolute height otherwise.
    */
    uint32 thaw_height = 6;
}

message PsbtShim {
    /*
    A unique identifier of 32 random bytes that will be used as the pending
    channel ID to identify the PSBT state machine when interacting with it and
    on the wire protocol to initiate the funding request.
    */
    bytes pending_chan_id = 1;

    /*
    An optional base PSBT the new channel output will be added to. If this is
    non-empty, it must be a binary serialized PSBT.
    */
    bytes base_psbt = 2;

    /*
    If a channel should be part of a batch (multiple channel openings in one
    transaction), it can be dangerous if the whole batch transaction is
    published too early before all channel opening negotiations are completed.
    This flag prevents this particular channel from broadcasting the transaction
    after the negotiation with the remote peer. In a batch of channel openings
    this flag should be set to true for every channel but the very last.
    */
    bool no_publish = 3;
}

message FundingShim {
    oneof shim {
        /*
        A channel shim where the channel point was fully constructed outside
        of lnd's wallet and the transaction might already be published.
        */
        ChanPointShim chan_point_shim = 1;

        /*
        A channel shim that uses a PSBT to fund and sign the channel funding
        transaction.
        */
        PsbtShim psbt_shim = 2;
    }
}

message FundingShimCancel {
    // The pending channel ID of the channel to cancel the funding shim for.
    bytes pending_chan_id = 1;
}

message FundingPsbtVerify {
    /*
    The funded but not yet signed PSBT that sends the exact channel capacity
    amount to the PK script returned in the open channel message in a previous
    step.
    */
    bytes funded_psbt = 1;

    // The pending channel ID of the channel to get the PSBT for.
    bytes pending_chan_id = 2;

    /*
    Can only be used if the no_publish flag was set to true in the OpenChannel
    call meaning that the caller is solely responsible for publishing the final
    funding transaction. If skip_finalize is set to true then lnd will not wait
    for a FundingPsbtFinalize state step and instead assumes that a transaction
    with the same TXID as the passed in PSBT will eventually confirm.
    IT IS ABSOLUTELY IMPERATIVE that the TXID of the transaction that is
    eventually published does have the _same TXID_ as the verified PSBT. That
    means no inputs or outputs can change, only signatures can be added. If the
    TXID changes between this call and the publish step then the channel will
    never be created and the funds will be in limbo.
    */
    bool skip_finalize = 3;
}

message FundingPsbtFinalize {
    /*
    The funded PSBT that contains all witness data to send the exact channel
    capacity amount to the PK script returned in the open channel message in a
    previous step. Cannot be set at the same time as final_raw_tx.
    */
    bytes signed_psbt = 1;

    // The pending channel ID of the channel to get the PSBT for.
    bytes pending_chan_id = 2;

    /*
    As an alternative to the signed PSBT with all witness data, the final raw
    wire format transaction can also be specified directly. Cannot be set at the
    same time as signed_psbt.
    */
    bytes final_raw_tx = 3;
}

message FundingTransitionMsg {
    oneof trigger {
        /*
        The funding shim to register. This should be used before any
        channel funding has began by the remote party, as it is intended as a
        preparatory step for the full channel funding.
        */
        FundingShim shim_register = 1;

        // Used to cancel an existing registered funding shim.
        FundingShimCancel shim_cancel = 2;

        /*
        Used to continue a funding flow that was initiated to be executed
        through a PSBT. This step verifies that the PSBT contains the correct
        outputs to fund the channel.
        */
        FundingPsbtVerify psbt_verify = 3;

        /*
        Used to continue a funding flow that was initiated to be executed
        through a PSBT. This step finalizes the funded and signed PSBT, finishes
        negotiation with the peer and finally publishes the resulting funding
        transaction.
        */
        FundingPsbtFinalize psbt_finalize = 4;
    }
}

message FundingStateStepResp {
}

message PendingHTLC {
    // The direction within the channel that the htlc was sent
    bool incoming = 1;

    // The total value of the htlc
    int64 amount = 2;

    // The final output to be swept back to the user's wallet
    string outpoint = 3;

    // The next block height at which we can spend the current stage
    uint32 maturity_height = 4;

    /*
       The number of blocks remaining until the current stage can be swept.
       Negative values indicate how many blocks have passed since becoming
       mature.
    */
    int32 blocks_til_maturity = 5;

    // Indicates whether the htlc is in its first or second stage of recovery
    uint32 stage = 6;
}

message PendingChannelsRequest {
}
message PendingChannelsResponse {
    message PendingChannel {
        string remote_node_pub = 1;
        string channel_point = 2;

        int64 capacity = 3;

        int64 local_balance = 4;
        int64 remote_balance = 5;

        // The minimum satoshis this node is required to reserve in its
        // balance.
        int64 local_chan_reserve_sat = 6;

        /*
        The minimum satoshis the other node is required to reserve in its
        balance.
        */
        int64 remote_chan_reserve_sat = 7;

        // The party that initiated opening the channel.
        Initiator initiator = 8;

        // The commitment type used by this channel.
        CommitmentType commitment_type = 9;

        // Total number of forwarding packages created in this channel.
        int64 num_forwarding_packages = 10;
    }

    message PendingOpenChannel {
        // The pending channel
        PendingChannel channel = 1;

        // The height at which this channel will be confirmed
        uint32 confirmation_height = 2;

        /*
        The amount calculated to be paid in fees for the current set of
        commitment transactions. The fee amount is persisted with the channel
        in order to allow the fee amount to be removed and recalculated with
        each channel state update, including updates that happen after a system
        restart.
        */
        int64 commit_fee = 4;

        // The weight of the commitment transaction
        int64 commit_weight = 5;

        /*
        The required number of satoshis per kilo-weight that the requester will
        pay at all times, for both the funding transaction and commitment
        transaction. This value can later be updated once the channel is open.
        */
        int64 fee_per_kw = 6;
    }

    message WaitingCloseChannel {
        // The pending channel waiting for closing tx to confirm
        PendingChannel channel = 1;

        // The balance in satoshis encumbered in this channel
        int64 limbo_balance = 2;

        /*
        A list of valid commitment transactions. Any of these can confirm at
        this point.
        */
        Commitments commitments = 3;
    }

    message Commitments {
        // Hash of the local version of the commitment tx.
        string local_txid = 1;

        // Hash of the remote version of the commitment tx.
        string remote_txid = 2;

        // Hash of the remote pending version of the commitment tx.
        string remote_pending_txid = 3;

        /*
        The amount in satoshis calculated to be paid in fees for the local
        commitment.
        */
        uint64 local_commit_fee_sat = 4;

        /*
        The amount in satoshis calculated to be paid in fees for the remote
        commitment.
        */
        uint64 remote_commit_fee_sat = 5;

        /*
        The amount in satoshis calculated to be paid in fees for the remote
        pending commitment.
        */
        uint64 remote_pending_commit_fee_sat = 6;
    }

    message ClosedChannel {
        // The pending channel to be closed
        PendingChannel channel = 1;

        // The transaction id of the closing transaction
        string closing_txid = 2;
    }

    message ForceClosedChannel {
        // The pending channel to be force closed
        PendingChannel channel = 1;

        // The transaction id of the closing transaction
        string closing_txid = 2;

        // The balance in satoshis encumbered in this pending channel
        int64 limbo_balance = 3;

        // The height at which funds can be swept into the wallet
        uint32 maturity_height = 4;

        /*
          Remaining # of blocks until the commitment output can be swept.
          Negative values indicate how many blocks have passed since becoming
          mature.
        */
        int32 blocks_til_maturity = 5;

        // The total value of funds successfully recovered from this channel
        int64 recovered_balance = 6;

        repeated PendingHTLC pending_htlcs = 8;

        enum AnchorState {
            LIMBO = 0;
            RECOVERED = 1;
            LOST = 2;
        }

        AnchorState anchor = 9;
    }

    // The balance in satoshis encumbered in pending channels
    int64 total_limbo_balance = 1;

    // Channels pending opening
    repeated PendingOpenChannel pending_open_channels = 2;

    /*
    Deprecated: Channels pending closing previously contained cooperatively
    closed channels with a single confirmation. These channels are now
    considered closed from the time we see them on chain.
    */
    repeated ClosedChannel pending_closing_channels = 3 [deprecated = true];

    // Channels pending force closing
    repeated ForceClosedChannel pending_force_closing_channels = 4;

    // Channels waiting for closing tx to confirm
    repeated WaitingCloseChannel waiting_close_channels = 5;
}

message ChannelEventSubscription {
}

message ChannelEventUpdate {
    oneof channel {
        Channel open_channel = 1;
        ChannelCloseSummary closed_channel = 2;
        ChannelPoint active_channel = 3;
        ChannelPoint inactive_channel = 4;
        PendingUpdate pending_open_channel = 6;
        ChannelPoint fully_resolved_channel = 7;
    }

    enum UpdateType {
        OPEN_CHANNEL = 0;
        CLOSED_CHANNEL = 1;
        ACTIVE_CHANNEL = 2;
        INACTIVE_CHANNEL = 3;
        PENDING_OPEN_CHANNEL = 4;
        FULLY_RESOLVED_CHANNEL = 5;
    }

    UpdateType type = 5;
}

message WalletAccountBalance {
    // The confirmed balance of the account (with >= 1 confirmations).
    int64 confirmed_balance = 1;

    // The unconfirmed balance of the account (with 0 confirmations).
    int64 unconfirmed_balance = 2;
}

message WalletBalanceRequest {
}

message WalletBalanceResponse {
    // The balance of the wallet
    int64 total_balance = 1;

    // The confirmed balance of a wallet(with >= 1 confirmations)
    int64 confirmed_balance = 2;

    // The unconfirmed balance of a wallet(with 0 confirmations)
    int64 unconfirmed_balance = 3;

    // A mapping of each wallet account's name to its balance.
    map<string, WalletAccountBalance> account_balance = 4;
}

message Amount {
    // Value denominated in satoshis.
    uint64 sat = 1;

    // Value denominated in milli-satoshis.
    uint64 msat = 2;
}

message ChannelBalanceRequest {
}
message ChannelBalanceResponse {
    // Deprecated. Sum of channels balances denominated in satoshis
    int64 balance = 1 [deprecated = true];

    // Deprecated. Sum of channels pending balances denominated in satoshis
    int64 pending_open_balance = 2 [deprecated = true];

    // Sum of channels local balances.
    Amount local_balance = 3;

    // Sum of channels remote balances.
    Amount remote_balance = 4;

    // Sum of channels local unsettled balances.
    Amount unsettled_local_balance = 5;

    // Sum of channels remote unsettled balances.
    Amount unsettled_remote_balance = 6;

    // Sum of channels pending local balances.
    Amount pending_open_local_balance = 7;

    // Sum of channels pending remote balances.
    Amount pending_open_remote_balance = 8;
}

message QueryRoutesRequest {
    // The 33-byte hex-encoded public key for the payment destination
    string pub_key = 1;

    /*
    The amount to send expressed in satoshis.

    The fields amt and amt_msat are mutually exclusive.
    */
    int64 amt = 2;

    /*
    The amount to send expressed in millisatoshis.

    The fields amt and amt_msat are mutually exclusive.
    */
    int64 amt_msat = 12;

    reserved 3;

    /*
    An optional CLTV delta from the current height that should be used for the
    timelock of the final hop. Note that unlike SendPayment, QueryRoutes does
    not add any additional block padding on top of final_ctlv_delta. This
    padding of a few blocks needs to be added manually or otherwise failures may
    happen when a block comes in while the payment is in flight.
    */
    int32 final_cltv_delta = 4;

    /*
    The maximum number of satoshis that will be paid as a fee of the payment.
    This value can be represented either as a percentage of the amount being
    sent, or as a fixed amount of the maximum fee the user is willing the pay to
    send the payment.
    */
    FeeLimit fee_limit = 5;

    /*
    A list of nodes to ignore during path finding. When using REST, these fields
    must be encoded as base64.
    */
    repeated bytes ignored_nodes = 6;

    /*
    Deprecated. A list of edges to ignore during path finding.
    */
    repeated EdgeLocator ignored_edges = 7 [deprecated = true];

    /*
    The source node where the request route should originated from. If empty,
    self is assumed.
    */
    string source_pub_key = 8;

    /*
    If set to true, edge probabilities from mission control will be used to get
    the optimal route.
    */
    bool use_mission_control = 9;

    /*
    A list of directed node pairs that will be ignored during path finding.
    */
    repeated NodePair ignored_pairs = 10;

    /*
    An optional maximum total time lock for the route. If the source is empty or
    ourselves, this should not exceed lnd's `--max-cltv-expiry` setting. If
    zero, then the value of `--max-cltv-expiry` is used as the limit.
    */
    uint32 cltv_limit = 11;

    /*
    An optional field that can be used to pass an arbitrary set of TLV records
    to a peer which understands the new records. This can be used to pass
    application specific data during the payment attempt. If the destination
    does not support the specified records, an error will be returned.
    Record types are required to be in the custom range >= 65536. When using
    REST, the values must be encoded as base64.
    */
    map<uint64, bytes> dest_custom_records = 13;

    /*
    The channel id of the channel that must be taken to the first hop. If zero,
    any channel may be used.
    */
    uint64 outgoing_chan_id = 14 [jstype = JS_STRING];

    /*
    The pubkey of the last hop of the route. If empty, any hop may be used.
    */
    bytes last_hop_pubkey = 15;

    /*
    Optional route hints to reach the destination through private channels.
    */
    repeated lnrpc.RouteHint route_hints = 16;

    /*
    Features assumed to be supported by the final node. All transitive feature
    dependencies must also be set properly. For a given feature bit pair, either
    optional or remote may be set, but not both. If this field is nil or empty,
    the router will try to load destination features from the graph as a
    fallback.
    */
    repeated lnrpc.FeatureBit dest_features = 17;
}

message NodePair {
    /*
    The sending node of the pair. When using REST, this field must be encoded as
    base64.
    */
    bytes from = 1;

    /*
    The receiving node of the pair. When using REST, this field must be encoded
    as base64.
    */
    bytes to = 2;
}

message EdgeLocator {
    // The short channel id of this edge.
    uint64 channel_id = 1 [jstype = JS_STRING];

    /*
    The direction of this edge. If direction_reverse is false, the direction
    of this edge is from the channel endpoint with the lexicographically smaller
    pub key to the endpoint with the larger pub key. If direction_reverse is
    is true, the edge goes the other way.
    */
    bool direction_reverse = 2;
}

message QueryRoutesResponse {
    /*
    The route that results from the path finding operation. This is still a
    repeated field to retain backwards compatibility.
    */
    repeated Route routes = 1;

    /*
    The success probability of the returned route based on the current mission
    control state. [EXPERIMENTAL]
    */
    double success_prob = 2;
}

message Hop {
    /*
    The unique channel ID for the channel. The first 3 bytes are the block
    height, the next 3 the index within the block, and the last 2 bytes are the
    output index for the channel.
    */
    uint64 chan_id = 1 [jstype = JS_STRING];
    int64 chan_capacity = 2 [deprecated = true];
    int64 amt_to_forward = 3 [deprecated = true];
    int64 fee = 4 [deprecated = true];
    uint32 expiry = 5;
    int64 amt_to_forward_msat = 6;
    int64 fee_msat = 7;

    /*
    An optional public key of the hop. If the public key is given, the payment
    can be executed without relying on a copy of the channel graph.
    */
    string pub_key = 8;

    /*
    If set to true, then this hop will be encoded using the new variable length
    TLV format. Note that if any custom tlv_records below are specified, then
    this field MUST be set to true for them to be encoded properly.
    */
    bool tlv_payload = 9;

    /*
    An optional TLV record that signals the use of an MPP payment. If present,
    the receiver will enforce that the same mpp_record is included in the final
    hop payload of all non-zero payments in the HTLC set. If empty, a regular
    single-shot payment is or was attempted.
    */
    MPPRecord mpp_record = 10;

    /*
    An optional TLV record that signals the use of an AMP payment. If present,
    the receiver will treat all received payments including the same
    (payment_addr, set_id) pair  as being part of one logical payment. The
    payment will be settled by XORing the root_share's together and deriving the
    child hashes and preimages according to BOLT XX. Must be used in conjunction
    with mpp_record.
    */
    AMPRecord amp_record = 12;

    /*
    An optional set of key-value TLV records. This is useful within the context
    of the SendToRoute call as it allows callers to specify arbitrary K-V pairs
    to drop off at each hop within the onion.
    */
    map<uint64, bytes> custom_records = 11;
}

message MPPRecord {
    /*
    A unique, random identifier used to authenticate the sender as the intended
    payer of a multi-path payment. The payment_addr must be the same for all
    subpayments, and match the payment_addr provided in the receiver's invoice.
    The same payment_addr must be used on all subpayments.
    */
    bytes payment_addr = 11;

    /*
    The total amount in milli-satoshis being sent as part of a larger multi-path
    payment. The caller is responsible for ensuring subpayments to the same node
    and payment_hash sum exactly to total_amt_msat. The same
    total_amt_msat must be used on all subpayments.
    */
    int64 total_amt_msat = 10;
}

message AMPRecord {
    bytes root_share = 1;

    bytes set_id = 2;

    uint32 child_index = 3;
}

/*
A path through the channel graph which runs over one or more channels in
succession. This struct carries all the information required to craft the
Sphinx onion packet, and send the payment along the first hop in the path. A
route is only selected as valid if all the channels have sufficient capacity to
carry the initial payment amount after fees are accounted for.
*/
message Route {
    /*
    The cumulative (final) time lock across the entire route. This is the CLTV
    value that should be extended to the first hop in the route. All other hops
    will decrement the time-lock as advertised, leaving enough time for all
    hops to wait for or present the payment preimage to complete the payment.
    */
    uint32 total_time_lock = 1;

    /*
    The sum of the fees paid at each hop within the final route. In the case
    of a one-hop payment, this value will be zero as we don't need to pay a fee
    to ourselves.
    */
    int64 total_fees = 2 [deprecated = true];

    /*
    The total amount of funds required to complete a payment over this route.
    This value includes the cumulative fees at each hop. As a result, the HTLC
    extended to the first-hop in the route will need to have at least this many
    satoshis, otherwise the route will fail at an intermediate node due to an
    insufficient amount of fees.
    */
    int64 total_amt = 3 [deprecated = true];

    /*
    Contains details concerning the specific forwarding details at each hop.
    */
    repeated Hop hops = 4;

    /*
    The total fees in millisatoshis.
    */
    int64 total_fees_msat = 5;

    /*
    The total amount in millisatoshis.
    */
    int64 total_amt_msat = 6;
}

message NodeInfoRequest {
    // The 33-byte hex-encoded compressed public of the target node
    string pub_key = 1;

    // If true, will include all known channels associated with the node.
    bool include_channels = 2;
}

message NodeInfo {
    /*
    An individual vertex/node within the channel graph. A node is
    connected to other nodes by one or more channel edges emanating from it. As
    the graph is directed, a node will also have an incoming edge attached to
    it for each outgoing edge.
    */
    LightningNode node = 1;

    // The total number of channels for the node.
    uint32 num_channels = 2;

    // The sum of all channels capacity for the node, denominated in satoshis.
    int64 total_capacity = 3;

    // A list of all public channels for the node.
    repeated ChannelEdge channels = 4;
}

/*
An individual vertex/node within the channel graph. A node is
connected to other nodes by one or more channel edges emanating from it. As the
graph is directed, a node will also have an incoming edge attached to it for
each outgoing edge.
*/
message LightningNode {
    uint32 last_update = 1;
    string pub_key = 2;
    string alias = 3;
    repeated NodeAddress addresses = 4;
    string color = 5;
    map<uint32, Feature> features = 6;
}

message NodeAddress {
    string network = 1;
    string addr = 2;
}

message RoutingPolicy {
    uint32 time_lock_delta = 1;
    int64 min_htlc = 2;
    int64 fee_base_msat = 3;
    int64 fee_rate_milli_msat = 4;
    bool disabled = 5;
    uint64 max_htlc_msat = 6;
    uint32 last_update = 7;
}

/*
A fully authenticated channel along with all its unique attributes.
Once an authenticated channel announcement has been processed on the network,
then an instance of ChannelEdgeInfo encapsulating the channels attributes is
stored. The other portions relevant to routing policy of a channel are stored
within a ChannelEdgePolicy for each direction of the channel.
*/
message ChannelEdge {
    /*
    The unique channel ID for the channel. The first 3 bytes are the block
    height, the next 3 the index within the block, and the last 2 bytes are the
    output index for the channel.
    */
    uint64 channel_id = 1 [jstype = JS_STRING];
    string chan_point = 2;

    uint32 last_update = 3 [deprecated = true];

    string node1_pub = 4;
    string node2_pub = 5;

    int64 capacity = 6;

    RoutingPolicy node1_policy = 7;
    RoutingPolicy node2_policy = 8;
}

message ChannelGraphRequest {
    /*
    Whether unannounced channels are included in the response or not. If set,
    unannounced channels are included. Unannounced channels are both private
    channels, and public channels that are not yet announced to the network.
    */
    bool include_unannounced = 1;
}

// Returns a new instance of the directed channel graph.
message ChannelGraph {
    // The list of `LightningNode`s in this channel graph
    repeated LightningNode nodes = 1;

    // The list of `ChannelEdge`s in this channel graph
    repeated ChannelEdge edges = 2;
}

enum NodeMetricType {
    UNKNOWN = 0;
    BETWEENNESS_CENTRALITY = 1;
}

message NodeMetricsRequest {
    // The requested node metrics.
    repeated NodeMetricType types = 1;
}

message NodeMetricsResponse {
    /*
    Betweenness centrality is the sum of the ratio of shortest paths that pass
    through the node for each pair of nodes in the graph (not counting paths
    starting or ending at this node).
    Map of node pubkey to betweenness centrality of the node. Normalized
    values are in the [0,1] closed interval.
    */
    map<string, FloatMetric> betweenness_centrality = 1;
}

message FloatMetric {
    // Arbitrary float value.
    double value = 1;

    // The value normalized to [0,1] or [-1,1].
    double normalized_value = 2;
}

message ChanInfoRequest {
    /*
    The unique channel ID for the channel. The first 3 bytes are the block
    height, the next 3 the index within the block, and the last 2 bytes are the
    output index for the channel.
    */
    uint64 chan_id = 1 [jstype = JS_STRING];
}

message NetworkInfoRequest {
}
message NetworkInfo {
    uint32 graph_diameter = 1;
    double avg_out_degree = 2;
    uint32 max_out_degree = 3;

    uint32 num_nodes = 4;
    uint32 num_channels = 5;

    int64 total_network_capacity = 6;

    double avg_channel_size = 7;
    int64 min_channel_size = 8;
    int64 max_channel_size = 9;
    int64 median_channel_size_sat = 10;

    // The number of edges marked as zombies.
    uint64 num_zombie_chans = 11;

    // TODO(roasbeef): fee rate info, expiry
    //  * also additional RPC for tracking fee info once in
}

message StopRequest {
}
message StopResponse {
}

message GraphTopologySubscription {
}
message GraphTopologyUpdate {
    repeated NodeUpdate node_updates = 1;
    repeated ChannelEdgeUpdate channel_updates = 2;
    repeated ClosedChannelUpdate closed_chans = 3;
}
message NodeUpdate {
    /*
    Deprecated, use node_addresses.
    */
    repeated string addresses = 1 [deprecated = true];

    string identity_key = 2;

    /*
    Deprecated, use features.
    */
    bytes global_features = 3 [deprecated = true];

    string alias = 4;
    string color = 5;
    repeated NodeAddress node_addresses = 7;

    /*
    Features that the node has advertised in the init message, node
    announcements and invoices.
    */
    map<uint32, Feature> features = 6;
}
message ChannelEdgeUpdate {
    /*
    The unique channel ID for the channel. The first 3 bytes are the block
    height, the next 3 the index within the block, and the last 2 bytes are the
    output index for the channel.
    */
    uint64 chan_id = 1 [jstype = JS_STRING];

    ChannelPoint chan_point = 2;

    int64 capacity = 3;

    RoutingPolicy routing_policy = 4;

    string advertising_node = 5;
    string connecting_node = 6;
}
message ClosedChannelUpdate {
    /*
    The unique channel ID for the channel. The first 3 bytes are the block
    height, the next 3 the index within the block, and the last 2 bytes are the
    output index for the channel.
    */
    uint64 chan_id = 1 [jstype = JS_STRING];
    int64 capacity = 2;
    uint32 closed_height = 3;
    ChannelPoint chan_point = 4;
}

message HopHint {
    // The public key of the node at the start of the channel.
    string node_id = 1;

    // The unique identifier of the channel.
    uint64 chan_id = 2 [jstype = JS_STRING];

    // The base fee of the channel denominated in millisatoshis.
    uint32 fee_base_msat = 3;

    /*
    The fee rate of the channel for sending one satoshi across it denominated in
    millionths of a satoshi.
    */
    uint32 fee_proportional_millionths = 4;

    // The time-lock delta of the channel.
    uint32 cltv_expiry_delta = 5;
}

message SetID {
    bytes set_id = 1;
}

message RouteHint {
    /*
    A list of hop hints that when chained together can assist in reaching a
    specific destination.
    */
    repeated HopHint hop_hints = 1;
}

message AMPInvoiceState {
    // The state the HTLCs associated with this setID are in.
    InvoiceHTLCState state = 1;

    // The settle index of this HTLC set, if the invoice state is settled.
    uint64 settle_index = 2;

    // The time this HTLC set was settled expressed in unix epoch.
    int64 settle_time = 3;

    // The total amount paid for the sub-invoice expressed in milli satoshis.
    int64 amt_paid_msat = 5;
}

message Invoice {
    /*
    An optional memo to attach along with the invoice. Used for record keeping
    purposes for the invoice's creator, and will also be set in the description
    field of the encoded payment request if the description_hash field is not
    being used.
    */
    string memo = 1;

    reserved 2;

    /*
    The hex-encoded preimage (32 byte) which will allow settling an incoming
    HTLC payable to this preimage. When using REST, this field must be encoded
    as base64.
    */
    bytes r_preimage = 3;

    /*
    The hash of the preimage. When using REST, this field must be encoded as
    base64.
    */
    bytes r_hash = 4;

    /*
    The value of this invoice in satoshis

    The fields value and value_msat are mutually exclusive.
    */
    int64 value = 5;

    /*
    The value of this invoice in millisatoshis

    The fields value and value_msat are mutually exclusive.
    */
    int64 value_msat = 23;

    // Whether this invoice has been fulfilled
    bool settled = 6 [deprecated = true];

    // When this invoice was created
    int64 creation_date = 7;

    // When this invoice was settled
    int64 settle_date = 8;

    /*
    A bare-bones invoice for a payment within the Lightning Network. With the
    details of the invoice, the sender has all the data necessary to send a
    payment to the recipient.
    */
    string payment_request = 9;

    /*
    Hash (SHA-256) of a description of the payment. Used if the description of
    payment (memo) is too long to naturally fit within the description field
    of an encoded payment request. When using REST, this field must be encoded
    as base64.
    */
    bytes description_hash = 10;

    // Payment request expiry time in seconds. Default is 3600 (1 hour).
    int64 expiry = 11;

    // Fallback on-chain address.
    string fallback_addr = 12;

    // Delta to use for the time-lock of the CLTV extended to the final hop.
    uint64 cltv_expiry = 13;

    /*
    Route hints that can each be individually used to assist in reaching the
    invoice's destination.
    */
    repeated RouteHint route_hints = 14;

    // Whether this invoice should include routing hints for private channels.
    bool private = 15;

    /*
    The "add" index of this invoice. Each newly created invoice will increment
    this index making it monotonically increasing. Callers to the
    SubscribeInvoices call can use this to instantly get notified of all added
    invoices with an add_index greater than this one.
    */
    uint64 add_index = 16;

    /*
    The "settle" index of this invoice. Each newly settled invoice will
    increment this index making it monotonically increasing. Callers to the
    SubscribeInvoices call can use this to instantly get notified of all
    settled invoices with an settle_index greater than this one.
    */
    uint64 settle_index = 17;

    // Deprecated, use amt_paid_sat or amt_paid_msat.
    int64 amt_paid = 18 [deprecated = true];

    /*
    The amount that was accepted for this invoice, in satoshis. This will ONLY
    be set if this invoice has been settled. We provide this field as if the
    invoice was created with a zero value, then we need to record what amount
    was ultimately accepted. Additionally, it's possible that the sender paid
    MORE that was specified in the original invoice. So we'll record that here
    as well.
    */
    int64 amt_paid_sat = 19;

    /*
    The amount that was accepted for this invoice, in millisatoshis. This will
    ONLY be set if this invoice has been settled. We provide this field as if
    the invoice was created with a zero value, then we need to record what
    amount was ultimately accepted. Additionally, it's possible that the sender
    paid MORE that was specified in the original invoice. So we'll record that
    here as well.
    */
    int64 amt_paid_msat = 20;

    enum InvoiceState {
        OPEN = 0;
        SETTLED = 1;
        CANCELED = 2;
        ACCEPTED = 3;
    }

    /*
    The state the invoice is in.
    */
    InvoiceState state = 21;

    // List of HTLCs paying to this invoice [EXPERIMENTAL].
    repeated InvoiceHTLC htlcs = 22;

    // List of features advertised on the invoice.
    map<uint32, Feature> features = 24;

    /*
    Indicates if this invoice was a spontaneous payment that arrived via keysend
    [EXPERIMENTAL].
    */
    bool is_keysend = 25;

    /*
    The payment address of this invoice. This value will be used in MPP
    payments, and also for newer invoices that always require the MPP payload
    for added end-to-end security.
    */
    bytes payment_addr = 26;

    /*
    Signals whether or not this is an AMP invoice.
    */
    bool is_amp = 27;

    /*
    [EXPERIMENTAL]:

    Maps a 32-byte hex-encoded set ID to the sub-invoice AMP state for the
    given set ID. This field is always populated for AMP invoices, and can be
    used along side LookupInvoice to obtain the HTLC information related to a
    given sub-invoice.
    */
    map<string, AMPInvoiceState> amp_invoice_state = 28;
}

enum InvoiceHTLCState {
    ACCEPTED = 0;
    SETTLED = 1;
    CANCELED = 2;
}

// Details of an HTLC that paid to an invoice
message InvoiceHTLC {
    // Short channel id over which the htlc was received.
    uint64 chan_id = 1 [jstype = JS_STRING];

    // Index identifying the htlc on the channel.
    uint64 htlc_index = 2;

    // The amount of the htlc in msat.
    uint64 amt_msat = 3;

    // Block height at which this htlc was accepted.
    int32 accept_height = 4;

    // Time at which this htlc was accepted.
    int64 accept_time = 5;

    // Time at which this htlc was settled or canceled.
    int64 resolve_time = 6;

    // Block height at which this htlc expires.
    int32 expiry_height = 7;

    // Current state the htlc is in.
    InvoiceHTLCState state = 8;

    // Custom tlv records.
    map<uint64, bytes> custom_records = 9;

    // The total amount of the mpp payment in msat.
    uint64 mpp_total_amt_msat = 10;

    // Details relevant to AMP HTLCs, only populated if this is an AMP HTLC.
    AMP amp = 11;
}

// Details specific to AMP HTLCs.
message AMP {
    // An n-of-n secret share of the root seed from which child payment hashes
    // and preimages are derived.
    bytes root_share = 1;

    // An identifier for the HTLC set that this HTLC belongs to.
    bytes set_id = 2;

    // A nonce used to randomize the child preimage and child hash from a given
    // root_share.
    uint32 child_index = 3;

    // The payment hash of the AMP HTLC.
    bytes hash = 4;

    // The preimage used to settle this AMP htlc. This field will only be
    // populated if the invoice is in InvoiceState_ACCEPTED or
    // InvoiceState_SETTLED.
    bytes preimage = 5;
}

message AddInvoiceResponse {
    bytes r_hash = 1;

    /*
    A bare-bones invoice for a payment within the Lightning Network. With the
    details of the invoice, the sender has all the data necessary to send a
    payment to the recipient.
    */
    string payment_request = 2;

    /*
    The "add" index of this invoice. Each newly created invoice will increment
    this index making it monotonically increasing. Callers to the
    SubscribeInvoices call can use this to instantly get notified of all added
    invoices with an add_index greater than this one.
    */
    uint64 add_index = 16;

    /*
    The payment address of the generated invoice. This value should be used
    in all payments for this invoice as we require it for end to end
    security.
    */
    bytes payment_addr = 17;
}
message PaymentHash {
    /*
    The hex-encoded payment hash of the invoice to be looked up. The passed
    payment hash must be exactly 32 bytes, otherwise an error is returned.
    Deprecated now that the REST gateway supports base64 encoding of bytes
    fields.
    */
    string r_hash_str = 1 [deprecated = true];

    /*
    The payment hash of the invoice to be looked up. When using REST, this field
    must be encoded as base64.
    */
    bytes r_hash = 2;
}

message ListInvoiceRequest {
    /*
    If set, only invoices that are not settled and not canceled will be returned
    in the response.
    */
    bool pending_only = 1;

    /*
    The index of an invoice that will be used as either the start or end of a
    query to determine which invoices should be returned in the response.
    */
    uint64 index_offset = 4;

    // The max number of invoices to return in the response to this query.
    uint64 num_max_invoices = 5;

    /*
    If set, the invoices returned will result from seeking backwards from the
    specified index offset. This can be used to paginate backwards.
    */
    bool reversed = 6;
}
message ListInvoiceResponse {
    /*
    A list of invoices from the time slice of the time series specified in the
    request.
    */
    repeated Invoice invoices = 1;

    /*
    The index of the last item in the set of returned invoices. This can be used
    to seek further, pagination style.
    */
    uint64 last_index_offset = 2;

    /*
    The index of the last item in the set of returned invoices. This can be used
    to seek backwards, pagination style.
    */
    uint64 first_index_offset = 3;
}

message InvoiceSubscription {
    /*
    If specified (non-zero), then we'll first start by sending out
    notifications for all added indexes with an add_index greater than this
    value. This allows callers to catch up on any events they missed while they
    weren't connected to the streaming RPC.
    */
    uint64 add_index = 1;

    /*
    If specified (non-zero), then we'll first start by sending out
    notifications for all settled indexes with an settle_index greater than
    this value. This allows callers to catch up on any events they missed while
    they weren't connected to the streaming RPC.
    */
    uint64 settle_index = 2;
}

enum PaymentFailureReason {
    /*
    Payment isn't failed (yet).
    */
    FAILURE_REASON_NONE = 0;

    /*
    There are more routes to try, but the payment timeout was exceeded.
    */
    FAILURE_REASON_TIMEOUT = 1;

    /*
    All possible routes were tried and failed permanently. Or were no
    routes to the destination at all.
    */
    FAILURE_REASON_NO_ROUTE = 2;

    /*
    A non-recoverable error has occured.
    */
    FAILURE_REASON_ERROR = 3;

    /*
    Payment details incorrect (unknown hash, invalid amt or
    invalid final cltv delta)
    */
    FAILURE_REASON_INCORRECT_PAYMENT_DETAILS = 4;

    /*
    Insufficient local balance.
    */
    FAILURE_REASON_INSUFFICIENT_BALANCE = 5;
}

message Payment {
    // The payment hash
    string payment_hash = 1;

    // Deprecated, use value_sat or value_msat.
    int64 value = 2 [deprecated = true];

    // Deprecated, use creation_time_ns
    int64 creation_date = 3 [deprecated = true];

    repeated string path = 4 [deprecated = true];

    // Deprecated, use fee_sat or fee_msat.
    int64 fee = 5 [deprecated = true];

    // The payment preimage
    string payment_preimage = 6;

    // The value of the payment in satoshis
    int64 value_sat = 7;

    // The value of the payment in milli-satoshis
    int64 value_msat = 8;

    // The optional payment request being fulfilled.
    string payment_request = 9;

    enum PaymentStatus {
        UNKNOWN = 0;
        IN_FLIGHT = 1;
        SUCCEEDED = 2;
        FAILED = 3;
    }

    // The status of the payment.
    PaymentStatus status = 10;

    //  The fee paid for this payment in satoshis
    int64 fee_sat = 11;

    //  The fee paid for this payment in milli-satoshis
    int64 fee_msat = 12;

    // The time in UNIX nanoseconds at which the payment was created.
    int64 creation_time_ns = 13;

    // The HTLCs made in attempt to settle the payment.
    repeated HTLCAttempt htlcs = 14;

    /*
    The creation index of this payment. Each payment can be uniquely identified
    by this index, which may not strictly increment by 1 for payments made in
    older versions of lnd.
    */
    uint64 payment_index = 15;

    PaymentFailureReason failure_reason = 16;
}

message HTLCAttempt {
    // The unique ID that is used for this attempt.
    uint64 attempt_id = 7;

    enum HTLCStatus {
        IN_FLIGHT = 0;
        SUCCEEDED = 1;
        FAILED = 2;
    }

    // The status of the HTLC.
    HTLCStatus status = 1;

    // The route taken by this HTLC.
    Route route = 2;

    // The time in UNIX nanoseconds at which this HTLC was sent.
    int64 attempt_time_ns = 3;

    /*
    The time in UNIX nanoseconds at which this HTLC was settled or failed.
    This value will not be set if the HTLC is still IN_FLIGHT.
    */
    int64 resolve_time_ns = 4;

    // Detailed htlc failure info.
    Failure failure = 5;

    // The preimage that was used to settle the HTLC.
    bytes preimage = 6;
}

message ListPaymentsRequest {
    /*
    If true, then return payments that have not yet fully completed. This means
    that pending payments, as well as failed payments will show up if this
    field is set to true. This flag doesn't change the meaning of the indices,
    which are tied to individual payments.
    */
    bool include_incomplete = 1;

    /*
    The index of a payment that will be used as either the start or end of a
    query to determine which payments should be returned in the response. The
    index_offset is exclusive. In the case of a zero index_offset, the query
    will start with the oldest payment when paginating forwards, or will end
    with the most recent payment when paginating backwards.
    */
    uint64 index_offset = 2;

    // The maximal number of payments returned in the response to this query.
    uint64 max_payments = 3;

    /*
    If set, the payments returned will result from seeking backwards from the
    specified index offset. This can be used to paginate backwards. The order
    of the returned payments is always oldest first (ascending index order).
    */
    bool reversed = 4;
}

message ListPaymentsResponse {
    // The list of payments
    repeated Payment payments = 1;

    /*
    The index of the first item in the set of returned payments. This can be
    used as the index_offset to continue seeking backwards in the next request.
    */
    uint64 first_index_offset = 2;

    /*
    The index of the last item in the set of returned payments. This can be used
    as the index_offset to continue seeking forwards in the next request.
    */
    uint64 last_index_offset = 3;
}

message DeletePaymentRequest {
    // Payment hash to delete.
    bytes payment_hash = 1;

    /*
    Only delete failed HTLCs from the payment, not the payment itself.
    */
    bool failed_htlcs_only = 2;
}

message DeleteAllPaymentsRequest {
    // Only delete failed payments.
    bool failed_payments_only = 1;

    /*
    Only delete failed HTLCs from payments, not the payment itself.
    */
    bool failed_htlcs_only = 2;
}

message DeletePaymentResponse {
}

message DeleteAllPaymentsResponse {
}

message AbandonChannelRequest {
    ChannelPoint channel_point = 1;

    bool pending_funding_shim_only = 2;

    /*
    Override the requirement for being in dev mode by setting this to true and
    confirming the user knows what they are doing and this is a potential foot
    gun to lose funds if used on active channels.
    */
    bool i_know_what_i_am_doing = 3;
}

message AbandonChannelResponse {
}

message DebugLevelRequest {
    bool show = 1;
    string level_spec = 2;
}
message DebugLevelResponse {
    string sub_systems = 1;
}

message PayReqString {
    // The payment request string to be decoded
    string pay_req = 1;
}
message PayReq {
    string destination = 1;
    string payment_hash = 2;
    int64 num_satoshis = 3;
    int64 timestamp = 4;
    int64 expiry = 5;
    string description = 6;
    string description_hash = 7;
    string fallback_addr = 8;
    int64 cltv_expiry = 9;
    repeated RouteHint route_hints = 10;
    bytes payment_addr = 11;
    int64 num_msat = 12;
    map<uint32, Feature> features = 13;
}

enum FeatureBit {
    DATALOSS_PROTECT_REQ = 0;
    DATALOSS_PROTECT_OPT = 1;
    INITIAL_ROUING_SYNC = 3;
    UPFRONT_SHUTDOWN_SCRIPT_REQ = 4;
    UPFRONT_SHUTDOWN_SCRIPT_OPT = 5;
    GOSSIP_QUERIES_REQ = 6;
    GOSSIP_QUERIES_OPT = 7;
    TLV_ONION_REQ = 8;
    TLV_ONION_OPT = 9;
    EXT_GOSSIP_QUERIES_REQ = 10;
    EXT_GOSSIP_QUERIES_OPT = 11;
    STATIC_REMOTE_KEY_REQ = 12;
    STATIC_REMOTE_KEY_OPT = 13;
    PAYMENT_ADDR_REQ = 14;
    PAYMENT_ADDR_OPT = 15;
    MPP_REQ = 16;
    MPP_OPT = 17;
    WUMBO_CHANNELS_REQ = 18;
    WUMBO_CHANNELS_OPT = 19;
    ANCHORS_REQ = 20;
    ANCHORS_OPT = 21;
    ANCHORS_ZERO_FEE_HTLC_REQ = 22;
    ANCHORS_ZERO_FEE_HTLC_OPT = 23;
    AMP_REQ = 30;
    AMP_OPT = 31;
}

message Feature {
    string name = 2;
    bool is_required = 3;
    bool is_known = 4;
}

message FeeReportRequest {
}
message ChannelFeeReport {
    // The short channel id that this fee report belongs to.
    uint64 chan_id = 5 [jstype = JS_STRING];

    // The channel that this fee report belongs to.
    string channel_point = 1;

    // The base fee charged regardless of the number of milli-satoshis sent.
    int64 base_fee_msat = 2;

    // The amount charged per milli-satoshis transferred expressed in
    // millionths of a satoshi.
    int64 fee_per_mil = 3;

    // The effective fee rate in milli-satoshis. Computed by dividing the
    // fee_per_mil value by 1 million.
    double fee_rate = 4;
}
message FeeReportResponse {
    // An array of channel fee reports which describes the current fee schedule
    // for each channel.
    repeated ChannelFeeReport channel_fees = 1;

    // The total amount of fee revenue (in satoshis) the switch has collected
    // over the past 24 hrs.
    uint64 day_fee_sum = 2;

    // The total amount of fee revenue (in satoshis) the switch has collected
    // over the past 1 week.
    uint64 week_fee_sum = 3;

    // The total amount of fee revenue (in satoshis) the switch has collected
    // over the past 1 month.
    uint64 month_fee_sum = 4;
}

message PolicyUpdateRequest {
    oneof scope {
        // If set, then this update applies to all currently active channels.
        bool global = 1;

        // If set, this update will target a specific channel.
        ChannelPoint chan_point = 2;
    }

    // The base fee charged regardless of the number of milli-satoshis sent.
    int64 base_fee_msat = 3;

    // The effective fee rate in milli-satoshis. The precision of this value
    // goes up to 6 decimal places, so 1e-6.
    double fee_rate = 4;

    // The required timelock delta for HTLCs forwarded over the channel.
    uint32 time_lock_delta = 5;

    // If set, the maximum HTLC size in milli-satoshis. If unset, the maximum
    // HTLC will be unchanged.
    uint64 max_htlc_msat = 6;

    // The minimum HTLC size in milli-satoshis. Only applied if
    // min_htlc_msat_specified is true.
    uint64 min_htlc_msat = 7;

    // If true, min_htlc_msat is applied.
    bool min_htlc_msat_specified = 8;
}
enum UpdateFailure {
    UPDATE_FAILURE_UNKNOWN = 0;
    UPDATE_FAILURE_PENDING = 1;
    UPDATE_FAILURE_NOT_FOUND = 2;
    UPDATE_FAILURE_INTERNAL_ERR = 3;
    UPDATE_FAILURE_INVALID_PARAMETER = 4;
}

message FailedUpdate {
    // The outpoint in format txid:n
    OutPoint outpoint = 1;

    // Reason for the policy update failure.
    UpdateFailure reason = 2;

    // A string representation of the policy update error.
    string update_error = 3;
}

message PolicyUpdateResponse {
    // List of failed policy updates.
    repeated FailedUpdate failed_updates = 1;
}

message ForwardingHistoryRequest {
    // Start time is the starting point of the forwarding history request. All
    // records beyond this point will be included, respecting the end time, and
    // the index offset.
    uint64 start_time = 1;

    // End time is the end point of the forwarding history request. The
    // response will carry at most 50k records between the start time and the
    // end time. The index offset can be used to implement pagination.
    uint64 end_time = 2;

    // Index offset is the offset in the time series to start at. As each
    // response can only contain 50k records, callers can use this to skip
    // around within a packed time series.
    uint32 index_offset = 3;

    // The max number of events to return in the response to this query.
    uint32 num_max_events = 4;
}
message ForwardingEvent {
    // Timestamp is the time (unix epoch offset) that this circuit was
    // completed. Deprecated by timestamp_ns.
    uint64 timestamp = 1 [deprecated = true];

    // The incoming channel ID that carried the HTLC that created the circuit.
    uint64 chan_id_in = 2 [jstype = JS_STRING];

    // The outgoing channel ID that carried the preimage that completed the
    // circuit.
    uint64 chan_id_out = 4 [jstype = JS_STRING];

    // The total amount (in satoshis) of the incoming HTLC that created half
    // the circuit.
    uint64 amt_in = 5;

    // The total amount (in satoshis) of the outgoing HTLC that created the
    // second half of the circuit.
    uint64 amt_out = 6;

    // The total fee (in satoshis) that this payment circuit carried.
    uint64 fee = 7;

    // The total fee (in milli-satoshis) that this payment circuit carried.
    uint64 fee_msat = 8;

    // The total amount (in milli-satoshis) of the incoming HTLC that created
    // half the circuit.
    uint64 amt_in_msat = 9;

    // The total amount (in milli-satoshis) of the outgoing HTLC that created
    // the second half of the circuit.
    uint64 amt_out_msat = 10;

    // The number of nanoseconds elapsed since January 1, 1970 UTC when this
    // circuit was completed.
    uint64 timestamp_ns = 11;

    // TODO(roasbeef): add settlement latency?
    //  * use FPE on the chan id?
    //  * also list failures?
}
message ForwardingHistoryResponse {
    // A list of forwarding events from the time slice of the time series
    // specified in the request.
    repeated ForwardingEvent forwarding_events = 1;

    // The index of the last time in the set of returned forwarding events. Can
    // be used to seek further, pagination style.
    uint32 last_offset_index = 2;
}

message ExportChannelBackupRequest {
    // The target channel point to obtain a back up for.
    ChannelPoint chan_point = 1;
}

message ChannelBackup {
    /*
    Identifies the channel that this backup belongs to.
    */
    ChannelPoint chan_point = 1;

    /*
    Is an encrypted single-chan backup. this can be passed to
    RestoreChannelBackups, or the WalletUnlocker Init and Unlock methods in
    order to trigger the recovery protocol. When using REST, this field must be
    encoded as base64.
    */
    bytes chan_backup = 2;
}

message MultiChanBackup {
    /*
    Is the set of all channels that are included in this multi-channel backup.
    */
    repeated ChannelPoint chan_points = 1;

    /*
    A single encrypted blob containing all the static channel backups of the
    channel listed above. This can be stored as a single file or blob, and
    safely be replaced with any prior/future versions. When using REST, this
    field must be encoded as base64.
    */
    bytes multi_chan_backup = 2;
}

message ChanBackupExportRequest {
}
message ChanBackupSnapshot {
    /*
    The set of new channels that have been added since the last channel backup
    snapshot was requested.
    */
    ChannelBackups single_chan_backups = 1;

    /*
    A multi-channel backup that covers all open channels currently known to
    lnd.
    */
    MultiChanBackup multi_chan_backup = 2;
}

message ChannelBackups {
    /*
    A set of single-chan static channel backups.
    */
    repeated ChannelBackup chan_backups = 1;
}

message RestoreChanBackupRequest {
    oneof backup {
        /*
        The channels to restore as a list of channel/backup pairs.
        */
        ChannelBackups chan_backups = 1;

        /*
        The channels to restore in the packed multi backup format. When using
        REST, this field must be encoded as base64.
        */
        bytes multi_chan_backup = 2;
    }
}
message RestoreBackupResponse {
}

message ChannelBackupSubscription {
}

message VerifyChanBackupResponse {
}

message MacaroonPermission {
    // The entity a permission grants access to.
    string entity = 1;

    // The action that is granted.
    string action = 2;
}
message BakeMacaroonRequest {
    // The list of permissions the new macaroon should grant.
    repeated MacaroonPermission permissions = 1;

    // The root key ID used to create the macaroon, must be a positive integer.
    uint64 root_key_id = 2;

    /*
    Informs the RPC on whether to allow external permissions that LND is not
    aware of.
    */
    bool allow_external_permissions = 3;
}
message BakeMacaroonResponse {
    // The hex encoded macaroon, serialized in binary format.
    string macaroon = 1;
}

message ListMacaroonIDsRequest {
}
message ListMacaroonIDsResponse {
    // The list of root key IDs that are in use.
    repeated uint64 root_key_ids = 1;
}

message DeleteMacaroonIDRequest {
    // The root key ID to be removed.
    uint64 root_key_id = 1;
}
message DeleteMacaroonIDResponse {
    // A boolean indicates that the deletion is successful.
    bool deleted = 1;
}

message MacaroonPermissionList {
    // A list of macaroon permissions.
    repeated MacaroonPermission permissions = 1;
}

message ListPermissionsRequest {
}
message ListPermissionsResponse {
    /*
    A map between all RPC method URIs and their required macaroon permissions to
    access them.
    */
    map<string, MacaroonPermissionList> method_permissions = 1;
}

message Failure {
    enum FailureCode {
        /*
        The numbers assigned in this enumeration match the failure codes as
        defined in BOLT #4. Because protobuf 3 requires enums to start with 0,
        a RESERVED value is added.
        */
        RESERVED = 0;

        INCORRECT_OR_UNKNOWN_PAYMENT_DETAILS = 1;
        INCORRECT_PAYMENT_AMOUNT = 2;
        FINAL_INCORRECT_CLTV_EXPIRY = 3;
        FINAL_INCORRECT_HTLC_AMOUNT = 4;
        FINAL_EXPIRY_TOO_SOON = 5;
        INVALID_REALM = 6;
        EXPIRY_TOO_SOON = 7;
        INVALID_ONION_VERSION = 8;
        INVALID_ONION_HMAC = 9;
        INVALID_ONION_KEY = 10;
        AMOUNT_BELOW_MINIMUM = 11;
        FEE_INSUFFICIENT = 12;
        INCORRECT_CLTV_EXPIRY = 13;
        CHANNEL_DISABLED = 14;
        TEMPORARY_CHANNEL_FAILURE = 15;
        REQUIRED_NODE_FEATURE_MISSING = 16;
        REQUIRED_CHANNEL_FEATURE_MISSING = 17;
        UNKNOWN_NEXT_PEER = 18;
        TEMPORARY_NODE_FAILURE = 19;
        PERMANENT_NODE_FAILURE = 20;
        PERMANENT_CHANNEL_FAILURE = 21;
        EXPIRY_TOO_FAR = 22;
        MPP_TIMEOUT = 23;
        INVALID_ONION_PAYLOAD = 24;

        /*
        An internal error occurred.
        */
        INTERNAL_FAILURE = 997;

        /*
        The error source is known, but the failure itself couldn't be decoded.
        */
        UNKNOWN_FAILURE = 998;

        /*
        An unreadable failure result is returned if the received failure message
        cannot be decrypted. In that case the error source is unknown.
        */
        UNREADABLE_FAILURE = 999;
    }

    // Failure code as defined in the Lightning spec
    FailureCode code = 1;

    reserved 2;

    // An optional channel update message.
    ChannelUpdate channel_update = 3;

    // A failure type-dependent htlc value.
    uint64 htlc_msat = 4;

    // The sha256 sum of the onion payload.
    bytes onion_sha_256 = 5;

    // A failure type-dependent cltv expiry value.
    uint32 cltv_expiry = 6;

    // A failure type-dependent flags value.
    uint32 flags = 7;

    /*
    The position in the path of the intermediate or final node that generated
    the failure message. Position zero is the sender node.
    **/
    uint32 failure_source_index = 8;

    // A failure type-dependent block height.
    uint32 height = 9;
}

message ChannelUpdate {
    /*
    The signature that validates the announced data and proves the ownership
    of node id.
    */
    bytes signature = 1;

    /*
    The target chain that this channel was opened within. This value
    should be the genesis hash of the target chain. Along with the short
    channel ID, this uniquely identifies the channel globally in a
    blockchain.
    */
    bytes chain_hash = 2;

    /*
    The unique description of the funding transaction.
    */
    uint64 chan_id = 3 [jstype = JS_STRING];

    /*
    A timestamp that allows ordering in the case of multiple announcements.
    We should ignore the message if timestamp is not greater than the
    last-received.
    */
    uint32 timestamp = 4;

    /*
    The bitfield that describes whether optional fields are present in this
    update. Currently, the least-significant bit must be set to 1 if the
    optional field MaxHtlc is present.
    */
    uint32 message_flags = 10;

    /*
    The bitfield that describes additional meta-data concerning how the
    update is to be interpreted. Currently, the least-significant bit must be
    set to 0 if the creating node corresponds to the first node in the
    previously sent channel announcement and 1 otherwise. If the second bit
    is set, then the channel is set to be disabled.
    */
    uint32 channel_flags = 5;

    /*
    The minimum number of blocks this node requires to be added to the expiry
    of HTLCs. This is a security parameter determined by the node operator.
    This value represents the required gap between the time locks of the
    incoming and outgoing HTLC's set to this node.
    */
    uint32 time_lock_delta = 6;

    /*
    The minimum HTLC value which will be accepted.
    */
    uint64 htlc_minimum_msat = 7;

    /*
    The base fee that must be used for incoming HTLC's to this particular
    channel. This value will be tacked onto the required for a payment
    independent of the size of the payment.
    */
    uint32 base_fee = 8;

    /*
    The fee rate that will be charged per millionth of a satoshi.
    */
    uint32 fee_rate = 9;

    /*
    The maximum HTLC value which will be accepted.
    */
    uint64 htlc_maximum_msat = 11;

    /*
    The set of data that was appended to this message, some of which we may
    not actually know how to iterate or parse. By holding onto this data, we
    ensure that we're able to properly validate the set of signatures that
    cover these new fields, and ensure we're able to make upgrades to the
    network in a forwards compatible manner.
    */
    bytes extra_opaque_data = 12;
}

message MacaroonId {
    bytes nonce = 1;
    bytes storageId = 2;
    repeated Op ops = 3;
}

message Op {
    string entity = 1;
    repeated string actions = 2;
}

message CheckMacPermRequest {
    bytes macaroon = 1;
    repeated MacaroonPermission permissions = 2;
    string fullMethod = 3;
}

message CheckMacPermResponse {
    bool valid = 1;
}

message RPCMiddlewareRequest {
    /*
    The unique ID of the intercepted original gRPC request. Useful for mapping
    request to response when implementing full duplex message interception. For
    streaming requests, this will be the same ID for all incoming and outgoing
    middleware intercept messages of the _same_ stream.
    */
    uint64 request_id = 1;

    /*
    The raw bytes of the complete macaroon as sent by the gRPC client in the
    original request. This might be empty for a request that doesn't require
    macaroons such as the wallet unlocker RPCs.
    */
    bytes raw_macaroon = 2;

    /*
    The parsed condition of the macaroon's custom caveat for convenient access.
    This field only contains the value of the custom caveat that the handling
    middleware has registered itself for. The condition _must_ be validated for
    messages of intercept_type stream_auth and request!
    */
    string custom_caveat_condition = 3;

    /*
    There are three types of messages that will be sent to the middleware for
    inspection and approval: Stream authentication, request and response
    interception. The first two can only be accepted (=forward to main RPC
    server) or denied (=return error to client). Intercepted responses can also
    be replaced/overwritten.
    */
    oneof intercept_type {
        /*
        Intercept stream authentication: each new streaming RPC call that is
        initiated against lnd and contains the middleware's custom macaroon
        caveat can be approved or denied based upon the macaroon in the stream
        header. This message will only be sent for streaming RPCs, unary RPCs
        must handle the macaroon authentication in the request interception to
        avoid an additional message round trip between lnd and the middleware.
        */
        StreamAuth stream_auth = 4;

        /*
        Intercept incoming gRPC client request message: all incoming messages,
        both on streaming and unary RPCs, are forwarded to the middleware for
        inspection. For unary RPC messages the middleware is also expected to
        validate the custom macaroon caveat of the request.
        */
        RPCMessage request = 5;

        /*
        Intercept outgoing gRPC response message: all outgoing messages, both on
        streaming and unary RPCs, are forwarded to the middleware for inspection
        and amendment. The response in this message is the original response as
        it was generated by the main RPC server. It can either be accepted
        (=forwarded to the client), replaced/overwritten with a new message of
        the same type, or replaced by an error message.
        */
        RPCMessage response = 6;
    }

    /*
    The unique message ID of this middleware intercept message. There can be
    multiple middleware intercept messages per single gRPC request (one for the
    incoming request and one for the outgoing response) or gRPC stream (one for
    each incoming message and one for each outgoing response). This message ID
    must be referenced when responding (accepting/rejecting/modifying) to an
    intercept message.
    */
    uint64 msg_id = 7;
}

message StreamAuth {
    /*
    The full URI (in the format /<rpcpackage>.<ServiceName>/MethodName, for
    example /lnrpc.Lightning/GetInfo) of the streaming RPC method that was just
    established.
    */
    string method_full_uri = 1;
}

message RPCMessage {
    /*
    The full URI (in the format /<rpcpackage>.<ServiceName>/MethodName, for
    example /lnrpc.Lightning/GetInfo) of the RPC method the message was sent
    to/from.
    */
    string method_full_uri = 1;

    /*
    Indicates whether the message was sent over a streaming RPC method or not.
    */
    bool stream_rpc = 2;

    /*
    The full canonical gRPC name of the message type (in the format
    <rpcpackage>.TypeName, for example lnrpc.GetInfoRequest).
    */
    string type_name = 3;

    /*
    The full content of the gRPC message, serialized in the binary protobuf
    format.
    */
    bytes serialized = 4;
}

message RPCMiddlewareResponse {
    /*
    The request message ID this response refers to. Must always be set when
    giving feedback to an intercept but is ignored for the initial registration
    message.
    */
    uint64 ref_msg_id = 1;

    /*
    The middleware can only send two types of messages to lnd: The initial
    registration message that identifies the middleware and after that only
    feedback messages to requests sent to the middleware.
    */
    oneof middleware_message {
        /*
        The registration message identifies the middleware that's being
        registered in lnd. The registration message must be sent immediately
        after initiating the RegisterRpcMiddleware stream, otherwise lnd will
        time out the attempt and terminate the request. NOTE: The middleware
        will only receive interception messages for requests that contain a
        macaroon with the custom caveat that the middleware declares it is
        responsible for handling in the registration message! As a security
        measure, _no_ middleware can intercept requests made with _unencumbered_
        macaroons!
        */
        MiddlewareRegistration register = 2;

        /*
        The middleware received an interception request and gives feedback to
        it. The request_id indicates what message the feedback refers to.
        */
        InterceptFeedback feedback = 3;
    }
}

message MiddlewareRegistration {
    /*
    The name of the middleware to register. The name should be as informative
    as possible and is logged on registration.
    */
    string middleware_name = 1;

    /*
    The name of the custom macaroon caveat that this middleware is responsible
    for. Only requests/responses that contain a macaroon with the registered
    custom caveat are forwarded for interception to the middleware. The
    exception being the read-only mode: All requests/responses are forwarded to
    a middleware that requests read-only access but such a middleware won't be
    allowed to _alter_ responses. As a security measure, _no_ middleware can
    change responses to requests made with _unencumbered_ macaroons!
    NOTE: Cannot be used at the same time as read_only_mode.
    */
    string custom_macaroon_caveat_name = 2;

    /*
    Instead of defining a custom macaroon caveat name a middleware can register
    itself for read-only access only. In that mode all requests/responses are
    forwarded to the middleware but the middleware isn't allowed to alter any of
    the responses.
    NOTE: Cannot be used at the same time as custom_macaroon_caveat_name.
    */
    bool read_only_mode = 3;
}

message InterceptFeedback {
    /*
    The error to return to the user. If this is non-empty, the incoming gRPC
    stream/request is aborted and the error is returned to the gRPC client. If
    this value is empty, it means the middleware accepts the stream/request/
    response and the processing of it can continue.
    */
    string error = 1;

    /*
    A boolean indicating that the gRPC response should be replaced/overwritten.
    As its name suggests, this can only be used as a feedback to an intercepted
    response RPC message and is ignored for feedback on any other message. This
    boolean is needed because in protobuf an empty message is serialized as a
    0-length or nil byte slice and we wouldn't be able to distinguish between
    an empty replacement message and the "don't replace anything" case.
    */
    bool replace_response = 2;

    /*
    If the replace_response field is set to true, this field must contain the
    binary serialized gRPC response message in the protobuf format.
    */
    bytes replacement_serialized = 3;
}