Custom Astar finality (#14021)

* Custom Astar finality * fix merge artifact * fix lint issue * simplify isRequestingFinalizedBlock * avoid iterating through the whole batch again * fix errors wrapping
smartcontractkit · Aug 9, 2024 · bd648bd · bd648bd
1 parent 95cb692
commit bd648bd
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Showing 11 changed files with 277 additions and 49 deletions.
diff --git a/.changeset/warm-houses-build.md b/.changeset/warm-houses-build.md
@@ -0,0 +1,5 @@
+---
+"chainlink": minor
+---
+
+Added custom finality calculation for Astar #internal
diff --git a/core/chains/evm/client/chain_client.go b/core/chains/evm/client/chain_client.go
@@ -160,9 +160,13 @@ func (c *chainClient) BalanceAt(ctx context.Context, account common.Address, blo
 	return c.multiNode.BalanceAt(ctx, account, blockNumber)
 }
 
+// BatchCallContext - sends all given requests as a single batch.
 // Request specific errors for batch calls are returned to the individual BatchElem.
 // Ensure the same BatchElem slice provided by the caller is passed through the call stack
 // to ensure the caller has access to the errors.
+// Note: some chains (e.g Astar) have custom finality requests, so even when FinalityTagEnabled=true, finality tag
+// might not be properly handled and returned results might have weaker finality guarantees. It's highly recommended
+// to use HeadTracker to identify latest finalized block.
 func (c *chainClient) BatchCallContext(ctx context.Context, b []rpc.BatchElem) error {
 	return c.multiNode.BatchCallContext(ctx, b)
 }

diff --git a/core/chains/evm/client/chain_client_test.go b/core/chains/evm/client/chain_client_test.go
@@ -328,7 +328,7 @@ func TestEthClient_HeaderByNumber(t *testing.T) {
 			`{"difficulty":"0xf3a00","extraData":"0xd883010503846765746887676f312e372e318664617277696e","gasLimit":"0xffc001","gasUsed":"0x0","hash":"0x41800b5c3f1717687d85fc9018faac0a6e90b39deaa0b99e7fe4fe796ddeb26a","logsBloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","miner":"0xd1aeb42885a43b72b518182ef893125814811048","mixHash":"0x0f98b15f1a4901a7e9204f3c500a7bd527b3fb2c3340e12176a44b83e414a69e","nonce":"0x0ece08ea8c49dfd9","number":"0x1","parentHash":"0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d","receiptsRoot":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","sha3Uncles":"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347","size":"0x218","stateRoot":"0xc7b01007a10da045eacb90385887dd0c38fcb5db7393006bdde24b93873c334b","timestamp":"0x58318da2","totalDifficulty":"0x1f3a00","transactions":[],"transactionsRoot":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","uncles":[]}`},
 		{"happy parity", expectedBlockNum, expectedBlockNum.Int64(), nil,
 			`{"author":"0xd1aeb42885a43b72b518182ef893125814811048","difficulty":"0xf3a00","extraData":"0xd883010503846765746887676f312e372e318664617277696e","gasLimit":"0xffc001","gasUsed":"0x0","hash":"0x41800b5c3f1717687d85fc9018faac0a6e90b39deaa0b99e7fe4fe796ddeb26a","logsBloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","miner":"0xd1aeb42885a43b72b518182ef893125814811048","mixHash":"0x0f98b15f1a4901a7e9204f3c500a7bd527b3fb2c3340e12176a44b83e414a69e","nonce":"0x0ece08ea8c49dfd9","number":"0x1","parentHash":"0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d","receiptsRoot":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","sealFields":["0xa00f98b15f1a4901a7e9204f3c500a7bd527b3fb2c3340e12176a44b83e414a69e","0x880ece08ea8c49dfd9"],"sha3Uncles":"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347","size":"0x218","stateRoot":"0xc7b01007a10da045eacb90385887dd0c38fcb5db7393006bdde24b93873c334b","timestamp":"0x58318da2","totalDifficulty":"0x1f3a00","transactions":[],"transactionsRoot":"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","uncles":[]}`},
-		{"missing header", expectedBlockNum, 0, fmt.Errorf("no live nodes available for chain %s", testutils.FixtureChainID.String()),
+		{"missing header", expectedBlockNum, 0, fmt.Errorf("RPCClient returned error (eth-primary-rpc-0): not found"),
 			`null`},
 	}
 
@@ -366,7 +366,7 @@ func TestEthClient_HeaderByNumber(t *testing.T) {
 			ctx, cancel := context.WithTimeout(tests.Context(t), 5*time.Second)
 			result, err := ethClient.HeadByNumber(ctx, expectedBlockNum)
 			if test.error != nil {
-				require.Error(t, err, test.error)
+				require.EqualError(t, err, test.error.Error())
 			} else {
 				require.NoError(t, err)
 				require.Equal(t, expectedBlockHash, result.Hash.Hex())

diff --git a/core/chains/evm/client/evm_client.go b/core/chains/evm/client/evm_client.go
@@ -22,13 +22,13 @@ func NewEvmClient(cfg evmconfig.NodePool, chainCfg commonclient.ChainConfig, cli
 	for i, node := range nodes {
 		if node.SendOnly != nil && *node.SendOnly {
 			rpc := NewRPCClient(lggr, empty, (*url.URL)(node.HTTPURL), *node.Name, int32(i), chainID,
-				commonclient.Secondary, cfg.FinalizedBlockPollInterval(), largePayloadRPCTimeout, defaultRPCTimeout)
+				commonclient.Secondary, cfg.FinalizedBlockPollInterval(), largePayloadRPCTimeout, defaultRPCTimeout, chainType)
 			sendonly := commonclient.NewSendOnlyNode(lggr, (url.URL)(*node.HTTPURL),
 				*node.Name, chainID, rpc)
 			sendonlys = append(sendonlys, sendonly)
 		} else {
 			rpc := NewRPCClient(lggr, (url.URL)(*node.WSURL), (*url.URL)(node.HTTPURL), *node.Name, int32(i),
-				chainID, commonclient.Primary, cfg.FinalizedBlockPollInterval(), largePayloadRPCTimeout, defaultRPCTimeout)
+				chainID, commonclient.Primary, cfg.FinalizedBlockPollInterval(), largePayloadRPCTimeout, defaultRPCTimeout, chainType)
 			primaryNode := commonclient.NewNode(cfg, chainCfg,
 				lggr, (url.URL)(*node.WSURL), (*url.URL)(node.HTTPURL), *node.Name, int32(i), chainID, *node.Order,
 				rpc, "EVM")

diff --git a/core/chains/evm/client/helpers_test.go b/core/chains/evm/client/helpers_test.go
@@ -140,7 +140,7 @@ func NewChainClientWithTestNode(
 	}
 
 	lggr := logger.Test(t)
-	rpc := NewRPCClient(lggr, *parsed, rpcHTTPURL, "eth-primary-rpc-0", id, chainID, commonclient.Primary, 0, commonclient.QueryTimeout, commonclient.QueryTimeout)
+	rpc := NewRPCClient(lggr, *parsed, rpcHTTPURL, "eth-primary-rpc-0", id, chainID, commonclient.Primary, 0, commonclient.QueryTimeout, commonclient.QueryTimeout, "")
 
 	n := commonclient.NewNode[*big.Int, *evmtypes.Head, RPCClient](
 		nodeCfg, clientMocks.ChainConfig{NoNewHeadsThresholdVal: noNewHeadsThreshold}, lggr, *parsed, rpcHTTPURL, "eth-primary-node-0", id, chainID, 1, rpc, "EVM")
@@ -152,7 +152,7 @@ func NewChainClientWithTestNode(
 			return nil, pkgerrors.Errorf("sendonly ethereum rpc url scheme must be http(s): %s", u.String())
 		}
 		var empty url.URL
-		rpc := NewRPCClient(lggr, empty, &sendonlyRPCURLs[i], fmt.Sprintf("eth-sendonly-rpc-%d", i), id, chainID, commonclient.Secondary, 0, commonclient.QueryTimeout, commonclient.QueryTimeout)
+		rpc := NewRPCClient(lggr, empty, &sendonlyRPCURLs[i], fmt.Sprintf("eth-sendonly-rpc-%d", i), id, chainID, commonclient.Secondary, 0, commonclient.QueryTimeout, commonclient.QueryTimeout, "")
 		s := commonclient.NewSendOnlyNode[*big.Int, RPCClient](
 			lggr, u, fmt.Sprintf("eth-sendonly-%d", i), chainID, rpc)
 		sendonlys = append(sendonlys, s)

diff --git a/core/chains/evm/client/rpc_client.go b/core/chains/evm/client/rpc_client.go
@@ -2,6 +2,7 @@ package client
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"math/big"
@@ -28,6 +29,7 @@ import (
 	commonclient "github.com/smartcontractkit/chainlink/v2/common/client"
 	commontypes "github.com/smartcontractkit/chainlink/v2/common/types"
 	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/assets"
+	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/config/chaintype"
 	evmtypes "github.com/smartcontractkit/chainlink/v2/core/chains/evm/types"
 	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/utils"
 	ubig "github.com/smartcontractkit/chainlink/v2/core/chains/evm/utils/big"
@@ -120,6 +122,7 @@ type rpcClient struct {
 	largePayloadRpcTimeout     time.Duration
 	rpcTimeout                 time.Duration
 	finalizedBlockPollInterval time.Duration
+	chainType                  chaintype.ChainType
 
 	ws   rawclient
 	http *rawclient
@@ -156,10 +159,12 @@ func NewRPCClient(
 	finalizedBlockPollInterval time.Duration,
 	largePayloadRpcTimeout time.Duration,
 	rpcTimeout time.Duration,
+	chainType chaintype.ChainType,
 ) RPCClient {
 	r := &rpcClient{
 		largePayloadRpcTimeout: largePayloadRpcTimeout,
 		rpcTimeout:             rpcTimeout,
+		chainType:              chainType,
 	}
 	r.name = name
 	r.id = id
@@ -396,8 +401,28 @@ func (r *rpcClient) CallContext(ctx context.Context, result interface{}, method
 	return err
 }
 
-func (r *rpcClient) BatchCallContext(ctx context.Context, b []rpc.BatchElem) error {
-	ctx, cancel, ws, http := r.makeLiveQueryCtxAndSafeGetClients(ctx, r.largePayloadRpcTimeout)
+func (r *rpcClient) BatchCallContext(rootCtx context.Context, b []rpc.BatchElem) error {
+	// Astar's finality tags provide weaker finality guarantees than we require.
+	// Fetch latest finalized block using Astar's custom requests and populate it after batch request completes
+	var astarRawLatestFinalizedBlock json.RawMessage
+	var requestedFinalizedBlock bool
+	if r.chainType == chaintype.ChainAstar {
+		for _, el := range b {
+			if !isRequestingFinalizedBlock(el) {
+				continue
+			}
+
+			requestedFinalizedBlock = true
+			err := r.astarLatestFinalizedBlock(rootCtx, &astarRawLatestFinalizedBlock)
+			if err != nil {
+				return fmt.Errorf("failed to get astar latest finalized block: %w", err)
+			}
+
+			break
+		}
+	}
+
+	ctx, cancel, ws, http := r.makeLiveQueryCtxAndSafeGetClients(rootCtx, r.largePayloadRpcTimeout)
 	defer cancel()
 	lggr := r.newRqLggr().With("nBatchElems", len(b), "batchElems", b)
 
@@ -412,8 +437,46 @@ func (r *rpcClient) BatchCallContext(ctx context.Context, b []rpc.BatchElem) err
 	duration := time.Since(start)
 
 	r.logResult(lggr, err, duration, r.getRPCDomain(), "BatchCallContext")
+	if err != nil {
+		return err
+	}
 
-	return err
+	if r.chainType == chaintype.ChainAstar && requestedFinalizedBlock {
+		// populate requested finalized block with correct value
+		for _, el := range b {
+			if !isRequestingFinalizedBlock(el) {
+				continue
+			}
+
+			el.Error = nil
+			err = json.Unmarshal(astarRawLatestFinalizedBlock, el.Result)
+			if err != nil {
+				el.Error = fmt.Errorf("failed to unmarshal astar finalized block into provided struct: %w", err)
+			}
+		}
+	}
+
+	return nil
+}
+
+func isRequestingFinalizedBlock(el rpc.BatchElem) bool {
+	isGetBlock := el.Method == "eth_getBlockByNumber" && len(el.Args) > 0
+	if !isGetBlock {
+		return false
+	}
+
+	if el.Args[0] == rpc.FinalizedBlockNumber {
+		return true
+	}
+
+	switch arg := el.Args[0].(type) {
+	case string:
+		return arg == rpc.FinalizedBlockNumber.String()
+	case fmt.Stringer:
+		return arg.String() == rpc.FinalizedBlockNumber.String()
+	default:
+		return false
+	}
 }
 
 // TODO: Full transition from SubscribeNewHead to SubscribeToHeads is done in BCI-2875
@@ -601,17 +664,84 @@ func (r *rpcClient) HeaderByHash(ctx context.Context, hash common.Hash) (header
 	return
 }
 
-func (r *rpcClient) LatestFinalizedBlock(ctx context.Context) (*evmtypes.Head, error) {
-	return r.blockByNumber(ctx, rpc.FinalizedBlockNumber.String())
+func (r *rpcClient) LatestFinalizedBlock(ctx context.Context) (head *evmtypes.Head, err error) {
+	// capture chStopInFlight to ensure we are not updating chainInfo with observations related to previous life cycle
+	ctx, cancel, chStopInFlight, _, _ := r.acquireQueryCtx(ctx, r.rpcTimeout)
+	defer cancel()
+	if r.chainType == chaintype.ChainAstar {
+		// astar's finality tags provide weaker guarantee. Use their custom request to request latest finalized block
+		err = r.astarLatestFinalizedBlock(ctx, &head)
+	} else {
+		err = r.ethGetBlockByNumber(ctx, rpc.FinalizedBlockNumber.String(), &head)
+	}
+
+	if err != nil {
+		return
+	}
+
+	if head == nil {
+		err = r.wrapRPCClientError(ethereum.NotFound)
+		return
+	}
+
+	head.EVMChainID = ubig.New(r.chainID)
+
+	r.onNewFinalizedHead(ctx, chStopInFlight, head)
+	return
+}
+
+func (r *rpcClient) astarLatestFinalizedBlock(ctx context.Context, result interface{}) (err error) {
+	var hashResult string
+	err = r.CallContext(ctx, &hashResult, "chain_getFinalizedHead")
+	if err != nil {
+		return fmt.Errorf("failed to get astar latest finalized hash: %w", err)
+	}
+
+	var astarHead struct {
+		Number *hexutil.Big `json:"number"`
+	}
+	err = r.CallContext(ctx, &astarHead, "chain_getHeader", hashResult, false)
+	if err != nil {
+		return fmt.Errorf("failed to get astar head by hash: %w", err)
+	}
+
+	if astarHead.Number == nil {
+		return r.wrapRPCClientError(fmt.Errorf("expected non empty head number of finalized block"))
+	}
+
+	err = r.ethGetBlockByNumber(ctx, astarHead.Number.String(), result)
+	if err != nil {
+		return fmt.Errorf("failed to get astar finalized block: %w", err)
+	}
+
+	return nil
 }
 
 func (r *rpcClient) BlockByNumber(ctx context.Context, number *big.Int) (head *evmtypes.Head, err error) {
-	hex := ToBlockNumArg(number)
-	return r.blockByNumber(ctx, hex)
+	ctx, cancel, chStopInFlight, _, _ := r.acquireQueryCtx(ctx, r.rpcTimeout)
+	defer cancel()
+	hexNumber := ToBlockNumArg(number)
+	err = r.ethGetBlockByNumber(ctx, hexNumber, &head)
+	if err != nil {
+		return
+	}
+
+	if head == nil {
+		err = r.wrapRPCClientError(ethereum.NotFound)
+		return
+	}
+
+	head.EVMChainID = ubig.New(r.chainID)
+
+	if hexNumber == rpc.LatestBlockNumber.String() {
+		r.onNewHead(ctx, chStopInFlight, head)
+	}
+
+	return
 }
 
-func (r *rpcClient) blockByNumber(ctx context.Context, number string) (head *evmtypes.Head, err error) {
-	ctx, cancel, chStopInFlight, ws, http := r.acquireQueryCtx(ctx, r.rpcTimeout)
+func (r *rpcClient) ethGetBlockByNumber(ctx context.Context, number string, result interface{}) (err error) {
+	ctx, cancel, ws, http := r.makeLiveQueryCtxAndSafeGetClients(ctx, r.rpcTimeout)
 	defer cancel()
 	const method = "eth_getBlockByNumber"
 	args := []interface{}{number, false}
@@ -623,30 +753,14 @@ func (r *rpcClient) blockByNumber(ctx context.Context, number string) (head *evm
 	lggr.Debug("RPC call: evmclient.Client#CallContext")
 	start := time.Now()
 	if http != nil {
-		err = r.wrapHTTP(http.rpc.CallContext(ctx, &head, method, args...))
+		err = r.wrapHTTP(http.rpc.CallContext(ctx, result, method, args...))
 	} else {
-		err = r.wrapWS(ws.rpc.CallContext(ctx, &head, method, args...))
+		err = r.wrapWS(ws.rpc.CallContext(ctx, result, method, args...))
 	}
 	duration := time.Since(start)
 
 	r.logResult(lggr, err, duration, r.getRPCDomain(), "CallContext")
-	if err != nil {
-		return nil, err
-	}
-	if head == nil {
-		err = r.wrapRPCClientError(ethereum.NotFound)
-		return
-	}
-	head.EVMChainID = ubig.New(r.chainID)
-
-	switch number {
-	case rpc.FinalizedBlockNumber.String():
-		r.onNewFinalizedHead(ctx, chStopInFlight, head)
-	case rpc.LatestBlockNumber.String():
-		r.onNewHead(ctx, chStopInFlight, head)
-	}
-
-	return
+	return err
 }
 
 func (r *rpcClient) BlockByHash(ctx context.Context, hash common.Hash) (head *evmtypes.Head, err error) {