Add getLatestInfo function to ILightClient

.gas-snapshot

@@ -1,20 +1,20 @@
 IBCMockAppTest:testHandshake() (gas: 3433206)
 IBCMockAppTest:testHandshakeBetweenDifferentPorts() (gas: 2539275)
-IBCMockAppTest:testPacketRelay() (gas: 9485102)
-IBCMockAppTest:testPacketTimeout() (gas: 2906505)
+IBCMockAppTest:testPacketRelay() (gas: 9417242)
+IBCMockAppTest:testPacketTimeout() (gas: 2899060)
 IBCTest:testBenchmarkCreateMockClient() (gas: 209365)
 IBCTest:testBenchmarkLCUpdateMockClient() (gas: 39945)
 IBCTest:testBenchmarkRecvPacket() (gas: 129941)
-IBCTest:testBenchmarkSendPacket() (gas: 84051)
+IBCTest:testBenchmarkSendPacket() (gas: 81008)
 IBCTest:testBenchmarkUpdateMockClient() (gas: 137373)
 IBCTest:testToUint128((uint64,uint64)) (runs: 256, μ: 947, ~: 947)
-TestICS02:testCreateClient() (gas: 23157317)
-TestICS02:testInvalidCreateClient() (gas: 23006914)
-TestICS02:testInvalidUpdateClient() (gas: 23008761)
-TestICS02:testRegisterClient() (gas: 22751790)
-TestICS02:testRegisterClientDuplicatedClientType() (gas: 22735015)
-TestICS02:testRegisterClientInvalidClientType() (gas: 22719144)
-TestICS02:testUpdateClient() (gas: 23174313)
+TestICS02:testCreateClient() (gas: 23141284)
+TestICS02:testInvalidCreateClient() (gas: 22990881)
+TestICS02:testInvalidUpdateClient() (gas: 22992728)
+TestICS02:testRegisterClient() (gas: 22735757)
+TestICS02:testRegisterClientDuplicatedClientType() (gas: 22718982)
+TestICS02:testRegisterClientInvalidClientType() (gas: 22703111)
+TestICS02:testUpdateClient() (gas: 23158280)
 TestICS03Handshake:testConnOpenAck() (gas: 1631720)
 TestICS03Handshake:testConnOpenConfirm() (gas: 1766228)
 TestICS03Handshake:testConnOpenInit() (gas: 1279055)
@@ -40,12 +40,12 @@ TestICS04Handshake:testInvalidChanOpenConfirm() (gas: 2116580)
 TestICS04Handshake:testInvalidChanOpenInit() (gas: 1275939)
 TestICS04Handshake:testInvalidChanOpenTry() (gas: 1352198)
 TestICS04Packet:testAcknowledgementPacket() (gas: 2276942)
-TestICS04Packet:testInvalidSendPacket() (gas: 2274601)
+TestICS04Packet:testInvalidSendPacket() (gas: 2274365)
 TestICS04Packet:testRecvPacket() (gas: 7645640)
-TestICS04Packet:testRecvPacketTimeoutHeight() (gas: 2320869)
-TestICS04Packet:testRecvPacketTimeoutTimestamp() (gas: 2319828)
-TestICS04Packet:testSendPacket() (gas: 5067297)
-TestICS04Packet:testTimeoutOnClose() (gas: 2539008)
+TestICS04Packet:testRecvPacketTimeoutHeight() (gas: 2314783)
+TestICS04Packet:testRecvPacketTimeoutTimestamp() (gas: 2313742)
+TestICS04Packet:testSendPacket() (gas: 5018609)
+TestICS04Packet:testTimeoutOnClose() (gas: 2532922)
 TestICS20:testAddressToHex(address) (runs: 256, μ: 22676, ~: 22804)
 TestICS20:testHexToAddress(string) (runs: 256, μ: 4776, ~: 4734)
 TestICS20:testIsEscapedString() (gas: 48979)

contracts/clients/IBFT2Client.sol

@@ -81,7 +81,7 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
         string calldata clientId,
         bytes calldata protoClientState,
         bytes calldata protoConsensusState
-    ) external override onlyIBC returns (Height.Data memory height) {
+    ) public override onlyIBC returns (Height.Data memory height) {
         ClientState.Data memory clientState = unmarshalClientState(protoClientState);
         ConsensusState.Data memory consensusState = unmarshalConsensusState(protoConsensusState);
         if (clientState.ibc_store_address.length != 20) {
@@ -103,7 +103,7 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
      *      The light client encodes a client message as ethereum ABI.
      */
     function routeUpdateClient(string calldata clientId, bytes calldata protoClientMessage)
-        external
+        public
         pure
         virtual
         override
@@ -118,7 +118,7 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
      *      The timestamp is nanoseconds since unix epoch.
      */
     function getTimestampAtHeight(string calldata clientId, Height.Data calldata height)
-        external
+        public
         view
         override
         returns (uint64)
@@ -134,7 +134,7 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
     /**
      * @dev getLatestHeight returns the latest height of the client state corresponding to `clientId`.
      */
-    function getLatestHeight(string calldata clientId) external view override returns (Height.Data memory) {
+    function getLatestHeight(string calldata clientId) public view override returns (Height.Data memory) {
         ClientState.Data storage clientState = clientStates[clientId];
         if (clientState.latest_height.revision_height == 0) {
             revert ClientStateNotFound(clientId);
@@ -145,10 +145,23 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
     /**
      * @dev getStatus returns the status of the client corresponding to `clientId`.
      */
-    function getStatus(string calldata) external pure override returns (ILightClient.ClientStatus) {
+    function getStatus(string calldata) public pure override returns (ILightClient.ClientStatus) {
         return ILightClient.ClientStatus.Active;
     }
 
+    /**
+     * @dev getLatestInfo returns the latest height, timestamp and status of the client corresponding to `clientId`.
+     */
+    function getLatestInfo(string calldata clientId)
+        public
+        view
+        returns (Height.Data memory latestHeight, uint64 latestTimestamp, ClientStatus status)
+    {
+        latestHeight = getLatestHeight(clientId);
+        latestTimestamp = consensusStates[clientId][latestHeight.toUint128()].timestamp;
+        status = ILightClient.ClientStatus.Active;
+    }
+
     /**
      * @dev updateClient updates the client with the given header
      */
@@ -204,7 +217,7 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
         bytes memory prefix,
         bytes memory path,
         bytes calldata value
-    ) external view override returns (bool) {
+    ) public view override returns (bool) {
         if (!validateArgsAndDelayPeriod(clientId, height, delayTimePeriod, delayBlockPeriod, prefix, proof)) {
             return false;
         }
@@ -232,7 +245,7 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
         bytes calldata proof,
         bytes calldata prefix,
         bytes calldata path
-    ) external view override returns (bool) {
+    ) public view override returns (bool) {
         if (!validateArgsAndDelayPeriod(clientId, height, delayTimePeriod, delayBlockPeriod, prefix, proof)) {
             return false;
         }
@@ -493,7 +506,7 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
      * @dev getClientState returns the clientState corresponding to `clientId`.
      *      If it's not found, the function returns false.
      */
-    function getClientState(string calldata clientId) external view returns (bytes memory clientStateBytes, bool) {
+    function getClientState(string calldata clientId) public view returns (bytes memory clientStateBytes, bool) {
         ClientState.Data storage clientState = clientStates[clientId];
         if (clientState.latest_height.revision_height == 0) {
             return (clientStateBytes, false);
@@ -506,7 +519,7 @@ contract IBFT2Client is ILightClient, ILightClientErrors {
      *      If it's not found, the function returns false.
      */
     function getConsensusState(string calldata clientId, Height.Data calldata height)
-        external
+        public
         view
         returns (bytes memory consensusStateBytes, bool)
     {

contracts/clients/LocalhostClient.sol

@@ -114,6 +114,16 @@ contract LocalhostClient is ILightClient, ILightClientErrors {
         return ClientStatus.Active;
     }
 
+    function getLatestInfo(string calldata clientId)
+        public
+        view
+        returns (Height.Data memory latestHeight, uint64 latestTimestamp, ClientStatus status)
+    {
+        latestHeight = getLatestHeight(clientId);
+        latestTimestamp = uint64(block.timestamp);
+        status = ILightClient.ClientStatus.Active;
+    }
+
     /**
      * @dev verifyMembership is a generic proof verification method which verifies a proof of the existence of a value at a given CommitmentPath at the specified height.
      * The caller is expected to construct the full CommitmentPath from a CommitmentPrefix and a standardized path (as defined in ICS 24).

contracts/clients/MockClient.sol

@@ -50,7 +50,7 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
         string calldata clientId,
         bytes calldata protoClientState,
         bytes calldata protoConsensusState
-    ) external virtual override onlyIBC returns (Height.Data memory height) {
+    ) public virtual override onlyIBC returns (Height.Data memory height) {
         ClientState.Data memory clientState = unmarshalClientState(protoClientState);
         ConsensusState.Data memory consensusState = unmarshalConsensusState(protoConsensusState);
         if (clientState.latest_height.revision_number != 0 || clientState.latest_height.revision_height == 0) {
@@ -70,7 +70,7 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
      *      The light client encodes a client message as ethereum ABI.
      */
     function routeUpdateClient(string calldata clientId, bytes calldata protoClientMessage)
-        external
+        public
         pure
         virtual
         override
@@ -92,7 +92,7 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
      *      The timestamp is nanoseconds since unix epoch.
      */
     function getTimestampAtHeight(string calldata clientId, Height.Data calldata height)
-        external
+        public
         view
         virtual
         override
@@ -108,7 +108,7 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
     /**
      * @dev getLatestHeight returns the latest height of the client state corresponding to `clientId`.
      */
-    function getLatestHeight(string calldata clientId) external view virtual override returns (Height.Data memory) {
+    function getLatestHeight(string calldata clientId) public view virtual override returns (Height.Data memory) {
         ClientState.Data storage clientState = clientStates[clientId];
         if (clientState.latest_height.revision_height == 0) {
             revert ClientStateNotFound(clientId);
@@ -119,14 +119,27 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
     /**
      * @dev getStatus returns the status of the client corresponding to `clientId`.
      */
-    function getStatus(string calldata clientId) external view virtual override returns (ClientStatus) {
+    function getStatus(string calldata clientId) public view virtual override returns (ClientStatus) {
         return statuses[clientId];
     }
 
+    /**
+     * @dev getLatestInfo returns the latest height, the latest timestamp, and the status of the client corresponding to `clientId`.
+     */
+    function getLatestInfo(string calldata clientId)
+        public
+        view
+        returns (Height.Data memory latestHeight, uint64 latestTimestamp, ClientStatus status)
+    {
+        latestHeight = getLatestHeight(clientId);
+        latestTimestamp = consensusStates[clientId][latestHeight.toUint128()].timestamp;
+        status = statuses[clientId];
+    }
     /**
      * @dev setStatus sets the status of the client corresponding to `clientId`.
      */
-    function setStatus(string calldata clientId, ClientStatus status) external virtual onlyOwner {
+
+    function setStatus(string calldata clientId, ClientStatus status) public virtual onlyOwner {
         statuses[clientId] = status;
     }
 
@@ -165,7 +178,7 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
         bytes memory prefix,
         bytes memory path,
         bytes calldata value
-    ) external view virtual override returns (bool) {
+    ) public view virtual override returns (bool) {
         if (consensusStates[clientId][height.toUint128()].timestamp == 0) {
             revert ConsensusStateNotFound(clientId, height);
         }
@@ -191,7 +204,7 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
         bytes calldata proof,
         bytes memory prefix,
         bytes memory path
-    ) external view virtual override returns (bool) {
+    ) public view virtual override returns (bool) {
         if (consensusStates[clientId][height.toUint128()].timestamp == 0) {
             revert ConsensusStateNotFound(clientId, height);
         }
@@ -208,7 +221,7 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
      *      If it's not found, the function returns false.
      */
     function getClientState(string calldata clientId)
-        external
+        public
         view
         virtual
         returns (bytes memory clientStateBytes, bool)
@@ -225,7 +238,7 @@ contract MockClient is Ownable, ILightClient, ILightClientErrors {
      *      If it's not found, the function returns false.
      */
     function getConsensusState(string calldata clientId, Height.Data calldata height)
-        external
+        public
         view
         virtual
         returns (bytes memory consensusStateBytes, bool)

contracts/core/02-client/ILightClient.sol

@@ -67,6 +67,14 @@ interface ILightClient {
      */
     function getStatus(string calldata clientId) external view returns (ClientStatus);
 
+    /**
+     * @dev getLatestInfo returns the latest height, the latest timestamp, and the status of the client corresponding to `clientId`.
+     */
+    function getLatestInfo(string calldata clientId)
+        external
+        view
+        returns (Height.Data memory latestHeight, uint64 latestTimestamp, ClientStatus status);
+
     /**
      * @dev verifyMembership is a generic proof verification method which verifies a proof of the existence of a value at a given CommitmentPath at the specified height.
      * The caller is expected to construct the full CommitmentPath from a CommitmentPrefix and a standardized path (as defined in ICS 24).

contracts/core/04-channel/IBCChannelPacketSendRecv.sol

@@ -49,19 +49,14 @@ contract IBCChannelPacketSendRecv is
         {
             // NOTE: We can assume here that the connection state is OPEN because the channel state is OPEN
             ConnectionEnd.Data storage connection = connections[channel.connection_hops[0]];
-            ILightClient client = ILightClient(clientImpls[connection.client_id]);
-            if (address(client) == address(0)) {
-                revert IBCHostClientNotFound(connection.client_id);
-            }
-            if (client.getStatus(connection.client_id) != ILightClient.ClientStatus.Active) {
+            (Height.Data memory latestHeight, uint64 latestTimestamp, ILightClient.ClientStatus status) =
+                ILightClient(clientImpls[connection.client_id]).getLatestInfo(connection.client_id);
+            if (status != ILightClient.ClientStatus.Active) {
                 revert IBCClientNotActiveClient(connection.client_id);
             }
-
-            Height.Data memory latestHeight = client.getLatestHeight(connection.client_id);
             if (!timeoutHeight.isZero() && latestHeight.gte(timeoutHeight)) {
                 revert IBCChannelPastPacketTimeoutHeight(timeoutHeight, latestHeight);
             }
-            uint64 latestTimestamp = client.getTimestampAtHeight(connection.client_id, latestHeight);
             if (timeoutTimestamp != 0 && latestTimestamp >= timeoutTimestamp) {
                 revert IBCChannelPastPacketTimeoutTimestamp(timeoutTimestamp, latestTimestamp);
             }