[KS-331] Single contract serving as router and forwarder (#13528)

* Remove redundant IForwarder interface

* Move Router error and events to the interface

* Remove unused import

* More refactors

* Tests pass

* Merge Forwarder + Router; wrappers + gas snapshot

* Use the same mechanism for the forwarder check

* Remove router deployment steps

* Add changesets

.changeset/ninety-zebras-hammer.md

@@ -0,0 +1,5 @@
+---
+"chainlink": patch
+---
+
+#internal

contracts/.changeset/odd-gorillas-develop.md

@@ -0,0 +1,5 @@
+---
+'@chainlink/contracts': patch
+---
+
+#internal

contracts/gas-snapshots/keystone.gas-snapshot

@@ -78,28 +78,28 @@ CapabilityRegistry_UpdateNodesTest:test_RevertWhen_P2PIDEmpty() (gas: 27291)
 CapabilityRegistry_UpdateNodesTest:test_RevertWhen_SignerAddressEmpty() (gas: 26974)
 CapabilityRegistry_UpdateNodesTest:test_RevertWhen_UpdatingNodeWithoutCapabilities() (gas: 25538)
 CapabilityRegistry_UpdateNodesTest:test_UpdatesNodeInfo() (gas: 158803)
-KeystoneForwarder_ReportTest:test_Report_ConfigVersion() (gas: 1807115)
-KeystoneForwarder_ReportTest:test_Report_FailedDeliveryWhenReceiverInterfaceNotSupported() (gas: 132145)
-KeystoneForwarder_ReportTest:test_Report_FailedDeliveryWhenReceiverNotContract() (gas: 133638)
-KeystoneForwarder_ReportTest:test_Report_SuccessfulDelivery() (gas: 162153)
-KeystoneForwarder_ReportTest:test_RevertWhen_AlreadyAttempted() (gas: 157192)
-KeystoneForwarder_ReportTest:test_RevertWhen_AnySignatureIsInvalid() (gas: 86392)
-KeystoneForwarder_ReportTest:test_RevertWhen_AnySignerIsInvalid() (gas: 118530)
-KeystoneForwarder_ReportTest:test_RevertWhen_ReportHasDuplicateSignatures() (gas: 94560)
-KeystoneForwarder_ReportTest:test_RevertWhen_ReportHasIncorrectDON() (gas: 75914)
-KeystoneForwarder_ReportTest:test_RevertWhen_ReportHasInexistentConfigVersion() (gas: 76282)
-KeystoneForwarder_ReportTest:test_RevertWhen_ReportIsMalformed() (gas: 45569)
-KeystoneForwarder_ReportTest:test_RevertWhen_TooFewSignatures() (gas: 55282)
-KeystoneForwarder_ReportTest:test_RevertWhen_TooManySignatures() (gas: 56028)
-KeystoneForwarder_SetConfigTest:test_RevertWhen_ExcessSigners() (gas: 20162)
-KeystoneForwarder_SetConfigTest:test_RevertWhen_FaultToleranceIsZero() (gas: 90143)
-KeystoneForwarder_SetConfigTest:test_RevertWhen_InsufficientSigners() (gas: 14511)
-KeystoneForwarder_SetConfigTest:test_RevertWhen_NotOwner() (gas: 90874)
-KeystoneForwarder_SetConfigTest:test_RevertWhen_ProvidingDuplicateSigners() (gas: 116644)
-KeystoneForwarder_SetConfigTest:test_SetConfig_FirstTime() (gas: 1543588)
-KeystoneForwarder_SetConfigTest:test_SetConfig_WhenSignersAreRemoved() (gas: 1540255)
+KeystoneForwarder_ReportTest:test_Report_ConfigVersion() (gas: 1802140)
+KeystoneForwarder_ReportTest:test_Report_FailedDeliveryWhenReceiverInterfaceNotSupported() (gas: 126020)
+KeystoneForwarder_ReportTest:test_Report_FailedDeliveryWhenReceiverNotContract() (gas: 127513)
+KeystoneForwarder_ReportTest:test_Report_SuccessfulDelivery() (gas: 156028)
+KeystoneForwarder_ReportTest:test_RevertWhen_AlreadyAttempted() (gas: 152578)
+KeystoneForwarder_ReportTest:test_RevertWhen_AnySignatureIsInvalid() (gas: 86398)
+KeystoneForwarder_ReportTest:test_RevertWhen_AnySignerIsInvalid() (gas: 118536)
+KeystoneForwarder_ReportTest:test_RevertWhen_ReportHasDuplicateSignatures() (gas: 94566)
+KeystoneForwarder_ReportTest:test_RevertWhen_ReportHasIncorrectDON() (gas: 75920)
+KeystoneForwarder_ReportTest:test_RevertWhen_ReportHasInexistentConfigVersion() (gas: 76288)
+KeystoneForwarder_ReportTest:test_RevertWhen_ReportIsMalformed() (gas: 45575)
+KeystoneForwarder_ReportTest:test_RevertWhen_TooFewSignatures() (gas: 55288)
+KeystoneForwarder_ReportTest:test_RevertWhen_TooManySignatures() (gas: 56034)
+KeystoneForwarder_SetConfigTest:test_RevertWhen_ExcessSigners() (gas: 20184)
+KeystoneForwarder_SetConfigTest:test_RevertWhen_FaultToleranceIsZero() (gas: 90165)
+KeystoneForwarder_SetConfigTest:test_RevertWhen_InsufficientSigners() (gas: 14533)
+KeystoneForwarder_SetConfigTest:test_RevertWhen_NotOwner() (gas: 90896)
+KeystoneForwarder_SetConfigTest:test_RevertWhen_ProvidingDuplicateSigners() (gas: 116678)
+KeystoneForwarder_SetConfigTest:test_SetConfig_FirstTime() (gas: 1543982)
+KeystoneForwarder_SetConfigTest:test_SetConfig_WhenSignersAreRemoved() (gas: 1540964)
 KeystoneForwarder_TypeAndVersionTest:test_TypeAndVersion() (gas: 9641)
-KeystoneRouter_SetConfigTest:test_AddForwarder_RevertWhen_NotOwner() (gas: 10956)
-KeystoneRouter_SetConfigTest:test_RemoveForwarder_RevertWhen_NotOwner() (gas: 10879)
-KeystoneRouter_SetConfigTest:test_Route_RevertWhen_Unauthorized() (gas: 18509)
-KeystoneRouter_SetConfigTest:test_Route_Success() (gas: 75585)
+KeystoneRouter_SetConfigTest:test_AddForwarder_RevertWhen_NotOwner() (gas: 10978)
+KeystoneRouter_SetConfigTest:test_RemoveForwarder_RevertWhen_NotOwner() (gas: 10923)
+KeystoneRouter_SetConfigTest:test_Route_RevertWhen_UnauthorizedForwarder() (gas: 18553)
+KeystoneRouter_SetConfigTest:test_Route_Success() (gas: 75629)

contracts/scripts/native_solc_compile_all_keystone

@@ -30,5 +30,4 @@ compileContract () {
 
 compileContract keystone/CapabilityRegistry.sol
 compileContract keystone/KeystoneForwarder.sol
-compileContract keystone/KeystoneRouter.sol
 compileContract keystone/OCR3Capability.sol

contracts/src/v0.8/keystone/KeystoneForwarder.sol

@@ -1,17 +1,17 @@
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.19;
 
-import {ITypeAndVersion} from "../shared/interfaces/ITypeAndVersion.sol";
+import {IReceiver} from "./interfaces/IReceiver.sol";
 import {IRouter} from "./interfaces/IRouter.sol";
-import {IForwarder} from "./interfaces/IForwarder.sol";
+import {ITypeAndVersion} from "../shared/interfaces/ITypeAndVersion.sol";
 
 import {OwnerIsCreator} from "../shared/access/OwnerIsCreator.sol";
 
 /// @notice This is an entry point for `write_${chain}` Target capability. It
 /// allows nodes to determine if reports have been processed (successfully or
 /// not) in a decentralized and product-agnostic way by recording processed
 /// reports.
-contract KeystoneForwarder is IForwarder, OwnerIsCreator, ITypeAndVersion {
+contract KeystoneForwarder is OwnerIsCreator, ITypeAndVersion, IRouter {
   /// @notice This error is returned when the report is shorter than
   /// REPORT_METADATA_LENGTH, which is the minimum length of a report.
   error InvalidReport();
@@ -64,8 +64,6 @@ contract KeystoneForwarder is IForwarder, OwnerIsCreator, ITypeAndVersion {
     mapping(address signer => uint256 position) _positions; // 1-indexed to detect unset values
   }
 
-  address internal s_router;
-
   /// @notice Contains the configuration for each DON ID
   // @param configId (uint64(donId) << 32) | configVersion
   mapping(uint64 configId => OracleSet) internal s_configs;
@@ -81,17 +79,98 @@ contract KeystoneForwarder is IForwarder, OwnerIsCreator, ITypeAndVersion {
     bool result
   );
 
-  string public constant override typeAndVersion = "KeystoneForwarder 1.0.0";
+  string public constant override typeAndVersion = "Forwarder and Router 1.0.0";
 
-  constructor(address router) OwnerIsCreator() {
-    s_router = router;
+  constructor() OwnerIsCreator() {
+    s_forwarders[address(this)] = true;
   }
 
   uint256 internal constant MAX_ORACLES = 31;
   uint256 internal constant METADATA_LENGTH = 109;
   uint256 internal constant FORWARDER_METADATA_LENGTH = 45;
   uint256 internal constant SIGNATURE_LENGTH = 65;
 
+  // ================================================================
+  // │                          IRouter                             │
+  // ================================================================
+
+  mapping(address forwarder => bool) internal s_forwarders;
+  mapping(bytes32 transmissionId => TransmissionInfo) internal s_transmissions;
+
+  function addForwarder(address forwarder) external onlyOwner {
+    s_forwarders[forwarder] = true;
+    emit ForwarderAdded(forwarder);
+  }
+
+  function removeForwarder(address forwarder) external onlyOwner {
+    s_forwarders[forwarder] = false;
+    emit ForwarderRemoved(forwarder);
+  }
+
+  function route(
+    bytes32 transmissionId,
+    address transmitter,
+    address receiver,
+    bytes calldata metadata,
+    bytes calldata validatedReport
+  ) public returns (bool) {
+    if (!s_forwarders[msg.sender]) {
+      revert UnauthorizedForwarder();
+    }
+
+    if (s_transmissions[transmissionId].transmitter != address(0)) revert AlreadyAttempted(transmissionId);
+    s_transmissions[transmissionId].transmitter = transmitter;
+
+    if (receiver.code.length == 0) return false;
+
+    try IReceiver(receiver).onReport(metadata, validatedReport) {
+      s_transmissions[transmissionId].success = true;
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
+  function getTransmissionId(
+    address receiver,
+    bytes32 workflowExecutionId,
+    bytes2 reportId
+  ) public pure returns (bytes32) {
+    // This is slightly cheaper compared to
+    // keccak256(abi.encode(receiver, workflowExecutionId, reportId));
+    return keccak256(bytes.concat(bytes20(uint160(receiver)), workflowExecutionId, reportId));
+  }
+
+  /// @notice Get transmitter of a given report or 0x0 if it wasn't transmitted yet
+  function getTransmitter(
+    address receiver,
+    bytes32 workflowExecutionId,
+    bytes2 reportId
+  ) external view returns (address) {
+    return s_transmissions[getTransmissionId(receiver, workflowExecutionId, reportId)].transmitter;
+  }
+
+  /// @notice Get delivery status of a given report
+  function getTransmissionState(
+    address receiver,
+    bytes32 workflowExecutionId,
+    bytes2 reportId
+  ) external view returns (IRouter.TransmissionState) {
+    bytes32 transmissionId = getTransmissionId(receiver, workflowExecutionId, reportId);
+
+    if (s_transmissions[transmissionId].transmitter == address(0)) return IRouter.TransmissionState.NOT_ATTEMPTED;
+    return
+      s_transmissions[transmissionId].success ? IRouter.TransmissionState.SUCCEEDED : IRouter.TransmissionState.FAILED;
+  }
+
+  function isForwarder(address forwarder) external view returns (bool) {
+    return s_forwarders[forwarder];
+  }
+
+  // ================================================================
+  // │                          Forwarder                           │
+  // ================================================================
+
   function setConfig(uint32 donId, uint32 configVersion, uint8 f, address[] calldata signers) external onlyOwner {
     if (f == 0) revert FaultToleranceMustBePositive();
     if (signers.length > MAX_ORACLES) revert ExcessSigners(signers.length, MAX_ORACLES);
@@ -170,7 +249,7 @@ contract KeystoneForwarder is IForwarder, OwnerIsCreator, ITypeAndVersion {
       }
     }
 
-    bool success = IRouter(s_router).route(
+    bool success = this.route(
       getTransmissionId(receiver, workflowExecutionId, reportId),
       msg.sender,
       receiver,
@@ -181,36 +260,6 @@ contract KeystoneForwarder is IForwarder, OwnerIsCreator, ITypeAndVersion {
     emit ReportProcessed(receiver, workflowExecutionId, reportId, success);
   }
 
-  function getTransmitter(
-    address receiver,
-    bytes32 workflowExecutionId,
-    bytes2 reportId
-  ) external view returns (address) {
-    return IRouter(s_router).getTransmitter(getTransmissionId(receiver, workflowExecutionId, reportId));
-  }
-
-  function getTransmissionState(
-    address receiver,
-    bytes32 workflowExecutionId,
-    bytes2 reportId
-  ) external view returns (IRouter.TransmissionState) {
-    return IRouter(s_router).getTransmissionState(getTransmissionId(receiver, workflowExecutionId, reportId));
-  }
-
-  function getTransmissionId(
-    address receiver,
-    bytes32 workflowExecutionId,
-    bytes2 reportId
-  ) public pure returns (bytes32) {
-    // This is slightly cheaper compared to
-    // keccak256(abi.encode(receiver, workflowExecutionId, reportId));
-    return keccak256(bytes.concat(bytes20(uint160(receiver)), workflowExecutionId, reportId));
-  }
-
-  function getRouter() external view returns (address) {
-    return s_router;
-  }
-
   // solhint-disable-next-line chainlink-solidity/explicit-returns
   function _getMetadata(
     bytes memory rawReport

contracts/src/v0.8/keystone/interfaces/IRouter.sol

@@ -3,12 +3,26 @@ pragma solidity ^0.8.19;
 
 /// @title IRouter - delivers keystone reports to receiver
 interface IRouter {
+  error UnauthorizedForwarder();
+  error AlreadyAttempted(bytes32 transmissionId);
+
+  event ForwarderAdded(address indexed forwarder);
+  event ForwarderRemoved(address indexed forwarder);
+
   enum TransmissionState {
     NOT_ATTEMPTED,
     SUCCEEDED,
     FAILED
   }
 
+  struct TransmissionInfo {
+    address transmitter;
+    bool success;
+  }
+
+  function addForwarder(address forwarder) external;
+  function removeForwarder(address forwarder) external;
+
   function route(
     bytes32 transmissionId,
     address transmitter,
@@ -17,6 +31,20 @@ interface IRouter {
     bytes calldata report
   ) external returns (bool);
 
-  function getTransmitter(bytes32 transmissionId) external view returns (address);
-  function getTransmissionState(bytes32 transmissionId) external view returns (TransmissionState);
+  function getTransmissionId(
+    address receiver,
+    bytes32 workflowExecutionId,
+    bytes2 reportId
+  ) external pure returns (bytes32);
+  function getTransmitter(
+    address receiver,
+    bytes32 workflowExecutionId,
+    bytes2 reportId
+  ) external view returns (address);
+  function getTransmissionState(
+    address receiver,
+    bytes32 workflowExecutionId,
+    bytes2 reportId
+  ) external view returns (TransmissionState);
+  function isForwarder(address forwarder) external view returns (bool);
 }