WS URL can be optional when LogBroadcaster is disabled

.changeset/silly-lies-boil.md

@@ -0,0 +1,8 @@
+---
+"chainlink": minor
+---
+
+Make websocket URL `WSURL` for `EVM.Nodes` optional, and apply logic so that:
+* If WS URL was not provided, SubscribeFilterLogs should fail with an explicit error
+* If WS URL was not provided LogBroadcaster should be disabled 
+#nops

common/client/node.go

@@ -91,14 +91,14 @@ type node[
 	services.StateMachine
 	lfcLog      logger.Logger
 	name        string
-	id          int32
+	id          int
 	chainID     CHAIN_ID
 	nodePoolCfg NodeConfig
 	chainCfg    ChainConfig
 	order       int32
 	chainFamily string
 
-	ws   url.URL
+	ws   *url.URL
 	http *url.URL
 
 	rpc RPC
@@ -121,10 +121,10 @@ func NewNode[
 	nodeCfg NodeConfig,
 	chainCfg ChainConfig,
 	lggr logger.Logger,
-	wsuri url.URL,
+	wsuri *url.URL,
 	httpuri *url.URL,
 	name string,
-	id int32,
+	id int,
 	chainID CHAIN_ID,
 	nodeOrder int32,
 	rpc RPC,
@@ -136,8 +136,10 @@ func NewNode[
 	n.chainID = chainID
 	n.nodePoolCfg = nodeCfg
 	n.chainCfg = chainCfg
-	n.ws = wsuri
 	n.order = nodeOrder
+	if wsuri != nil {
+		n.ws = wsuri
+	}
 	if httpuri != nil {
 		n.http = httpuri
 	}
@@ -157,7 +159,10 @@ func NewNode[
 }
 
 func (n *node[CHAIN_ID, HEAD, RPC]) String() string {
-	s := fmt.Sprintf("(%s)%s:%s", Primary.String(), n.name, n.ws.String())
+	s := fmt.Sprintf("(%s)%s", Primary.String(), n.name)
+	if n.ws != nil {
+		s = s + fmt.Sprintf(":%s", n.ws.String())
+	}
 	if n.http != nil {
 		s = s + fmt.Sprintf(":%s", n.http.String())
 	}

common/client/node_test.go

@@ -67,10 +67,10 @@ type testNodeOpts struct {
 	config      testNodeConfig
 	chainConfig clientMocks.ChainConfig
 	lggr        logger.Logger
-	wsuri       url.URL
+	wsuri       *url.URL
 	httpuri     *url.URL
 	name        string
-	id          int32
+	id          int
 	chainID     types.ID
 	nodeOrder   int32
 	rpc         *mockNodeClient[types.ID, Head]

core/chains/evm/client/config_builder.go

@@ -80,15 +80,21 @@ func NewClientConfigs(
 func parseNodeConfigs(nodeCfgs []NodeConfig) ([]*toml.Node, error) {
 	nodes := make([]*toml.Node, len(nodeCfgs))
 	for i, nodeCfg := range nodeCfgs {
-		if nodeCfg.WSURL == nil || nodeCfg.HTTPURL == nil {
-			return nil, fmt.Errorf("node config [%d]: missing WS or HTTP URL", i)
+		var wsURL, httpURL *commonconfig.URL
+		// wsUrl requirement will be checked in EVMConfig validation
+		if nodeCfg.WSURL != nil {
+			wsURL = commonconfig.MustParseURL(*nodeCfg.WSURL)
 		}
-		wsUrl := commonconfig.MustParseURL(*nodeCfg.WSURL)
-		httpUrl := commonconfig.MustParseURL(*nodeCfg.HTTPURL)
+
+		if nodeCfg.HTTPURL == nil {
+			return nil, fmt.Errorf("node config [%d]: missing HTTP URL", i)
+		}
+
+		httpURL = commonconfig.MustParseURL(*nodeCfg.HTTPURL)
 		node := &toml.Node{
 			Name:     nodeCfg.Name,
-			WSURL:    wsUrl,
-			HTTPURL:  httpUrl,
+			WSURL:    wsURL,
+			HTTPURL:  httpURL,
 			SendOnly: nodeCfg.SendOnly,
 			Order:    nodeCfg.Order,
 		}

core/chains/evm/client/config_builder_test.go

@@ -93,15 +93,15 @@ func TestNodeConfigs(t *testing.T) {
 		require.Len(t, tomlNodes, len(nodeConfigs))
 	})
 
-	t.Run("parsing missing ws url fails", func(t *testing.T) {
+	t.Run("ws can be optional", func(t *testing.T) {
 		nodeConfigs := []client.NodeConfig{
 			{
 				Name:    ptr("foo1"),
 				HTTPURL: ptr("http://foo1.test"),
 			},
 		}
 		_, err := client.ParseTestNodeConfigs(nodeConfigs)
-		require.Error(t, err)
+		require.Nil(t, err)
 	})
 
 	t.Run("parsing missing http url fails", func(t *testing.T) {

core/chains/evm/client/evm_client.go

@@ -15,22 +15,25 @@ import (
 )
 
 func NewEvmClient(cfg evmconfig.NodePool, chainCfg commonclient.ChainConfig, clientErrors evmconfig.ClientErrors, lggr logger.Logger, chainID *big.Int, nodes []*toml.Node, chainType chaintype.ChainType) Client {
-	var empty url.URL
 	var primaries []commonclient.Node[*big.Int, *evmtypes.Head, RPCClient]
 	var sendonlys []commonclient.SendOnlyNode[*big.Int, RPCClient]
 	largePayloadRPCTimeout, defaultRPCTimeout := getRPCTimeouts(chainType)
 	for i, node := range nodes {
+		var ws *url.URL
+		if node.WSURL != nil {
+			ws = (*url.URL)(node.WSURL)
+		}
 		if node.SendOnly != nil && *node.SendOnly {
-			rpc := NewRPCClient(lggr, empty, (*url.URL)(node.HTTPURL), *node.Name, int32(i), chainID,
+			rpc := NewRPCClient(lggr, nil, (*url.URL)(node.HTTPURL), *node.Name, i, chainID,
 				commonclient.Secondary, cfg.FinalizedBlockPollInterval(), cfg.NewHeadsPollInterval(), 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),
+			rpc := NewRPCClient(lggr, ws, (*url.URL)(node.HTTPURL), *node.Name, i,
 				chainID, commonclient.Primary, cfg.FinalizedBlockPollInterval(), cfg.NewHeadsPollInterval(), largePayloadRPCTimeout, defaultRPCTimeout, chainType)
 			primaryNode := commonclient.NewNode(cfg, chainCfg,
-				lggr, (url.URL)(*node.WSURL), (*url.URL)(node.HTTPURL), *node.Name, int32(i), chainID, *node.Order,
+				lggr, ws, (*url.URL)(node.HTTPURL), *node.Name, i, chainID, *node.Order,
 				rpc, "EVM")
 			primaries = append(primaries, primaryNode)
 		}

core/chains/evm/client/helpers_test.go

@@ -135,7 +135,7 @@ func NewChainClientWithTestNode(
 	rpcUrl string,
 	rpcHTTPURL *url.URL,
 	sendonlyRPCURLs []url.URL,
-	id int32,
+	id int,
 	chainID *big.Int,
 ) (Client, error) {
 	parsed, err := url.ParseRequestURI(rpcUrl)
@@ -148,10 +148,10 @@ func NewChainClientWithTestNode(
 	}
 
 	lggr := logger.Test(t)
-	rpc := NewRPCClient(lggr, *parsed, rpcHTTPURL, "eth-primary-rpc-0", id, chainID, commonclient.Primary, 0, 0, commonclient.QueryTimeout, commonclient.QueryTimeout, "")
+	rpc := NewRPCClient(lggr, parsed, rpcHTTPURL, "eth-primary-rpc-0", id, chainID, commonclient.Primary, 0, 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")
+		nodeCfg, clientMocks.ChainConfig{NoNewHeadsThresholdVal: noNewHeadsThreshold}, lggr, parsed, rpcHTTPURL, "eth-primary-node-0", id, chainID, 1, rpc, "EVM")
 	primaries := []commonclient.Node[*big.Int, *evmtypes.Head, RPCClient]{n}
 
 	var sendonlys []commonclient.SendOnlyNode[*big.Int, RPCClient]
@@ -160,7 +160,7 @@ 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, 0, commonclient.QueryTimeout, commonclient.QueryTimeout, "")
+		rpc := NewRPCClient(lggr, &empty, &sendonlyRPCURLs[i], fmt.Sprintf("eth-sendonly-rpc-%d", i), id, chainID, commonclient.Secondary, 0, 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)
@@ -206,7 +206,7 @@ func NewChainClientWithMockedRpc(
 	parsed, _ := url.ParseRequestURI("ws://test")
 
 	n := commonclient.NewNode[*big.Int, *evmtypes.Head, RPCClient](
-		cfg, clientMocks.ChainConfig{NoNewHeadsThresholdVal: noNewHeadsThreshold}, lggr, *parsed, nil, "eth-primary-node-0", 1, chainID, 1, rpc, "EVM")
+		cfg, clientMocks.ChainConfig{NoNewHeadsThresholdVal: noNewHeadsThreshold}, lggr, parsed, nil, "eth-primary-node-0", 1, chainID, 1, rpc, "EVM")
 	primaries := []commonclient.Node[*big.Int, *evmtypes.Head, RPCClient]{n}
 	clientErrors := NewTestClientErrors()
 	c := NewChainClient(lggr, selectionMode, leaseDuration, noNewHeadsThreshold, primaries, nil, chainID, chainType, &clientErrors, 0)

core/chains/evm/client/rpc_client.go

@@ -117,7 +117,7 @@ type rawclient struct {
 type rpcClient struct {
 	rpcLog                     logger.SugaredLogger
 	name                       string
-	id                         int32
+	id                         int
 	chainID                    *big.Int
 	tier                       commonclient.NodeTier
 	largePayloadRpcTimeout     time.Duration
@@ -126,7 +126,7 @@ type rpcClient struct {
 	newHeadsPollInterval       time.Duration
 	chainType                  chaintype.ChainType
 
-	ws   rawclient
+	ws   *rawclient
 	http *rawclient
 
 	stateMu sync.RWMutex // protects state* fields
@@ -153,10 +153,10 @@ type rpcClient struct {
 // NewRPCCLient returns a new *rpcClient as commonclient.RPC
 func NewRPCClient(
 	lggr logger.Logger,
-	wsuri url.URL,
+	wsuri *url.URL,
 	httpuri *url.URL,
 	name string,
-	id int32,
+	id int,
 	chainID *big.Int,
 	tier commonclient.NodeTier,
 	finalizedBlockPollInterval time.Duration,
@@ -174,9 +174,11 @@ func NewRPCClient(
 	r.id = id
 	r.chainID = chainID
 	r.tier = tier
-	r.ws.uri = wsuri
 	r.finalizedBlockPollInterval = finalizedBlockPollInterval
 	r.newHeadsPollInterval = newHeadsPollInterval
+	if wsuri != nil {
+		r.ws = &rawclient{uri: *wsuri}
+	}
 	if httpuri != nil {
 		r.http = &rawclient{uri: *httpuri}
 	}
@@ -198,30 +200,33 @@ func (r *rpcClient) Dial(callerCtx context.Context) error {
 	ctx, cancel := r.makeQueryCtx(callerCtx, r.rpcTimeout)
 	defer cancel()
 
-	promEVMPoolRPCNodeDials.WithLabelValues(r.chainID.String(), r.name).Inc()
-	lggr := r.rpcLog.With("wsuri", r.ws.uri.Redacted())
-	if r.http != nil {
-		lggr = lggr.With("httpuri", r.http.uri.Redacted())
+	if r.ws == nil && r.http == nil {
+		return errors.New("cannot dial rpc client when both ws and http info are missing")
 	}
-	lggr.Debugw("RPC dial: evmclient.Client#dial")
 
-	wsrpc, err := rpc.DialWebsocket(ctx, r.ws.uri.String(), "")
-	if err != nil {
-		promEVMPoolRPCNodeDialsFailed.WithLabelValues(r.chainID.String(), r.name).Inc()
-		return r.wrapRPCClientError(pkgerrors.Wrapf(err, "error while dialing websocket: %v", r.ws.uri.Redacted()))
-	}
+	promEVMPoolRPCNodeDials.WithLabelValues(r.chainID.String(), r.name).Inc()
+	lggr := r.rpcLog
+	if r.ws != nil {
+		lggr = lggr.With("wsuri", r.ws.uri.Redacted())
+		wsrpc, err := rpc.DialWebsocket(ctx, r.ws.uri.String(), "")
+		if err != nil {
+			promEVMPoolRPCNodeDialsFailed.WithLabelValues(r.chainID.String(), r.name).Inc()
+			return r.wrapRPCClientError(pkgerrors.Wrapf(err, "error while dialing websocket: %v", r.ws.uri.Redacted()))
+		}
 
-	r.ws.rpc = wsrpc
-	r.ws.geth = ethclient.NewClient(wsrpc)
+		r.ws.rpc = wsrpc
+		r.ws.geth = ethclient.NewClient(wsrpc)
+	}
 
 	if r.http != nil {
+		lggr = lggr.With("httpuri", r.http.uri.Redacted())
 		if err := r.DialHTTP(); err != nil {
 			return err
 		}
 	}
 
+	lggr.Debugw("RPC dial: evmclient.Client#dial")
 	promEVMPoolRPCNodeDialsSuccess.WithLabelValues(r.chainID.String(), r.name).Inc()
-
 	return nil
 }
 
@@ -230,7 +235,7 @@ func (r *rpcClient) Dial(callerCtx context.Context) error {
 // It can only return error if the URL is malformed.
 func (r *rpcClient) DialHTTP() error {
 	promEVMPoolRPCNodeDials.WithLabelValues(r.chainID.String(), r.name).Inc()
-	lggr := r.rpcLog.With("httpuri", r.ws.uri.Redacted())
+	lggr := r.rpcLog.With("httpuri", r.http.uri.Redacted())
 	lggr.Debugw("RPC dial: evmclient.Client#dial")
 
 	var httprpc *rpc.Client
@@ -269,7 +274,10 @@ func (r *rpcClient) cancelInflightRequests() {
 }
 
 func (r *rpcClient) String() string {
-	s := fmt.Sprintf("(%s)%s:%s", r.tier.String(), r.name, r.ws.uri.Redacted())
+	s := fmt.Sprintf("(%s)%s", r.tier.String(), r.name)
+	if r.ws != nil {
+		s = s + fmt.Sprintf(":%s", r.ws.uri.Redacted())
+	}
 	if r.http != nil {
 		s = s + fmt.Sprintf(":%s", r.http.uri.Redacted())
 	}
@@ -488,11 +496,8 @@ func isRequestingFinalizedBlock(el rpc.BatchElem) bool {
 
 // TODO: Full transition from SubscribeNewHead to SubscribeToHeads is done in BCI-2875
 func (r *rpcClient) SubscribeNewHead(ctx context.Context, channel chan<- *evmtypes.Head) (_ commontypes.Subscription, err error) {
-	ctx, cancel, chStopInFlight, ws, _ := r.acquireQueryCtx(ctx, r.rpcTimeout)
-	defer cancel()
 	args := []interface{}{"newHeads"}
 	lggr := r.newRqLggr().With("args", args)
-
 	if r.newHeadsPollInterval > 0 {
 		interval := r.newHeadsPollInterval
 		timeout := interval
@@ -505,6 +510,12 @@ func (r *rpcClient) SubscribeNewHead(ctx context.Context, channel chan<- *evmtyp
 		return &poller, nil
 	}
 
+	ctx, cancel, chStopInFlight, ws, _ := r.acquireQueryCtx(ctx, r.rpcTimeout)
+	defer cancel()
+	if ws == nil {
+		return nil, errors.New("SubscribeNewHead is not allowed without ws url")
+	}
+
 	lggr.Debug("RPC call: evmclient.Client#EthSubscribe")
 	start := time.Now()
 	defer func() {
@@ -531,9 +542,6 @@ func (r *rpcClient) SubscribeNewHead(ctx context.Context, channel chan<- *evmtyp
 }
 
 func (r *rpcClient) SubscribeToHeads(ctx context.Context) (ch <-chan *evmtypes.Head, sub commontypes.Subscription, err error) {
-	ctx, cancel, chStopInFlight, ws, _ := r.acquireQueryCtx(ctx, r.rpcTimeout)
-	defer cancel()
-
 	args := []interface{}{rpcSubscriptionMethodNewHeads}
 	start := time.Now()
 	lggr := r.newRqLggr().With("args", args)
@@ -551,6 +559,12 @@ func (r *rpcClient) SubscribeToHeads(ctx context.Context) (ch <-chan *evmtypes.H
 		return channel, &poller, nil
 	}
 
+	ctx, cancel, chStopInFlight, ws, _ := r.acquireQueryCtx(ctx, r.rpcTimeout)
+	defer cancel()
+	if ws == nil {
+		return nil, nil, errors.New("SubscribeNewHead is not allowed without ws url")
+	}
+
 	lggr.Debug("RPC call: evmclient.Client#EthSubscribe")
 	defer func() {
 		duration := time.Since(start)
@@ -1249,6 +1263,9 @@ func (r *rpcClient) ClientVersion(ctx context.Context) (version string, err erro
 func (r *rpcClient) SubscribeFilterLogs(ctx context.Context, q ethereum.FilterQuery, ch chan<- types.Log) (_ ethereum.Subscription, err error) {
 	ctx, cancel, chStopInFlight, ws, _ := r.acquireQueryCtx(ctx, r.rpcTimeout)
 	defer cancel()
+	if ws == nil {
+		return nil, errors.New("SubscribeFilterLogs is not allowed without ws url")
+	}
 	lggr := r.newRqLggr().With("q", q)
 
 	lggr.Debug("RPC call: evmclient.Client#SubscribeFilterLogs")
@@ -1353,18 +1370,21 @@ func (r *rpcClient) wrapHTTP(err error) error {
 }
 
 // makeLiveQueryCtxAndSafeGetClients wraps makeQueryCtx
-func (r *rpcClient) makeLiveQueryCtxAndSafeGetClients(parentCtx context.Context, timeout time.Duration) (ctx context.Context, cancel context.CancelFunc, ws rawclient, http *rawclient) {
+func (r *rpcClient) makeLiveQueryCtxAndSafeGetClients(parentCtx context.Context, timeout time.Duration) (ctx context.Context, cancel context.CancelFunc, ws *rawclient, http *rawclient) {
 	ctx, cancel, _, ws, http = r.acquireQueryCtx(parentCtx, timeout)
 	return
 }
 
 func (r *rpcClient) acquireQueryCtx(parentCtx context.Context, timeout time.Duration) (ctx context.Context, cancel context.CancelFunc,
-	chStopInFlight chan struct{}, ws rawclient, http *rawclient) {
+	chStopInFlight chan struct{}, ws *rawclient, http *rawclient) {
 	// Need to wrap in mutex because state transition can cancel and replace the
 	// context
 	r.stateMu.RLock()
 	chStopInFlight = r.chStopInFlight
-	ws = r.ws
+	if r.ws != nil {
+		cp := *r.ws
+		ws = &cp
+	}
 	if r.http != nil {
 		cp := *r.http
 		http = &cp