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add RPC call Metadata requesting sector IDs
This is second attempt of #2321 The whole list of IDs can be expensive for a host to provide for free, but a short list of sector IDs (up to 2^17) is cheap. At the same time it opens doors for stateless clients, i.e. recovering everything from seed only.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| package host | ||
|
|
||
| import ( | ||
| "errors" | ||
| "net" | ||
|
|
||
| "github.com/NebulousLabs/Sia/encoding" | ||
| "github.com/NebulousLabs/Sia/modules" | ||
| ) | ||
|
|
||
| // managedRPCMetadata accepts a request to get list of sector ids. | ||
| func (h *Host) managedRPCMetadata(conn net.Conn) error { | ||
| // Perform the file contract revision exchange, giving the renter the most | ||
| // recent file contract revision and getting the storage obligation that | ||
| // will be used to get sector ids. | ||
| _, so, err := h.managedRPCRecentRevision(conn) | ||
| if err != nil { | ||
| return extendErr("RPCRecentRevision failed: ", err) | ||
| } | ||
| // The storage obligation is received with a lock on it. Defer a call to | ||
| // unlock the storage obligation. | ||
| defer func() { | ||
| h.managedUnlockStorageObligation(so.id()) | ||
| }() | ||
| // Receive boundaries of so.SectorRoots to return. | ||
| var begin, end uint64 | ||
| err = encoding.ReadObject(conn, &begin, 8) | ||
| if err != nil { | ||
| return extendErr("unable to read 'begin': ", ErrorConnection(err.Error())) | ||
| } | ||
| err = encoding.ReadObject(conn, &end, 8) | ||
| if err != nil { | ||
| return extendErr("unable to read 'end': ", ErrorConnection(err.Error())) | ||
| } | ||
| if end < begin { | ||
| err = errors.New("Range error") | ||
| modules.WriteNegotiationRejection(conn, err) | ||
| return err | ||
| } | ||
| if end > uint64(len(so.SectorRoots)) { | ||
| err = errors.New("Range out of bounds error") | ||
| modules.WriteNegotiationRejection(conn, err) | ||
| return err | ||
| } | ||
| if end-begin > modules.NegotiateMetadataMaxSliceSize { | ||
| err = errors.New("The range is too long") | ||
| modules.WriteNegotiationRejection(conn, err) | ||
| return err | ||
| } | ||
| if err = modules.WriteNegotiationAcceptance(conn); err != nil { | ||
| return extendErr("failed to write [begin,end) acceptance: ", ErrorConnection(err.Error())) | ||
| } | ||
| // Write roots of all sectors. | ||
| err = encoding.WriteObject(conn, so.SectorRoots[begin:end]) | ||
| if err != nil { | ||
| return extendErr("cound not write sectors: ", ErrorConnection(err.Error())) | ||
| } | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package proto | ||
|
|
||
| import ( | ||
| "errors" | ||
| "net" | ||
| "time" | ||
|
|
||
| "github.com/NebulousLabs/Sia/crypto" | ||
| "github.com/NebulousLabs/Sia/encoding" | ||
| "github.com/NebulousLabs/Sia/modules" | ||
| "github.com/NebulousLabs/Sia/types" | ||
| ) | ||
|
|
||
| // GetMetadata downloads sector IDs from the host. | ||
| func GetMetadata(host modules.HostDBEntry, fcid types.FileContractID, sk crypto.SecretKey, windowStart types.BlockHeight, begin, end uint64, cancel <-chan struct{}) (lastRevision types.FileContractRevision, ids []crypto.Hash, err error) { | ||
| conn, err := (&net.Dialer{ | ||
| Cancel: cancel, | ||
| Timeout: 15 * time.Second, | ||
| }).Dial("tcp", string(host.NetAddress)) | ||
| if err != nil { | ||
| return | ||
| } | ||
| defer conn.Close() | ||
| // allot 2 minutes for RPC request + revision exchange | ||
| extendDeadline(conn, modules.NegotiateMetadataTime) | ||
| if err = encoding.WriteObject(conn, modules.RPCMetadata); err != nil { | ||
| err = errors.New("couldn't initiate RPC: " + err.Error()) | ||
| return | ||
| } | ||
| lastRevision, err = getRecentRevision(conn, fcid, sk, windowStart, host.Version) | ||
| if err != nil { | ||
| return | ||
| } | ||
| if err = encoding.WriteObject(conn, begin); err != nil { | ||
| err = errors.New("unable to write 'begin': " + err.Error()) | ||
| return | ||
| } | ||
| if err = encoding.WriteObject(conn, end); err != nil { | ||
| err = errors.New("unable to write 'end': " + err.Error()) | ||
| return | ||
| } | ||
| // read acceptance | ||
| if err = modules.ReadNegotiationAcceptance(conn); err != nil { | ||
| err = errors.New("host did not accept [begin,end): " + err.Error()) | ||
| return | ||
| } | ||
| numSectors := end - begin | ||
| if err = encoding.ReadObject(conn, &ids, numSectors*crypto.HashSize+8); err != nil { | ||
| err = errors.New("unable to read 'ids': " + err.Error()) | ||
| return | ||
| } | ||
| if uint64(len(ids)) != end-begin { | ||
| err = errors.New("the host returned too short list of sector IDs") | ||
| return | ||
| } | ||
| return | ||
| } |