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Feat: RPC failover support(read only) #1073

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Feat: RPC failover support(read only) #1073

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cf6b1a9
feat(node): add multi-endpoint failover for the L1 RPC client
Sep 21, 2026
4731eda
fix(node): harden the L1 RPC failover transport
Sep 22, 2026
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17 changes: 12 additions & 5 deletions node/cmd/node/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ import (
"morph-l2/node/flags"
"morph-l2/node/hakeeper"
"morph-l2/node/l1sequencer"
"morph-l2/node/rpcfailover"
"morph-l2/node/sequencer"
"morph-l2/node/sequencer/mock"
"morph-l2/node/sync"
Expand Down Expand Up @@ -106,15 +107,21 @@ func L2NodeMain(ctx *cli.Context) error {
}

// ========== Shared L1 client ==========
// One ethclient.Dial per process — all L1-touching components (syncer,
// derivation, l1sequencer Tracker/Verifier/Signer, rollup binding) share
// the same connection pool, retry policy, and metrics surface. Adding a
// new consumer means injecting this client, not opening a new one.
// One dial per process — all L1-touching components (syncer, derivation,
// l1sequencer Tracker/Verifier/Signer, rollup binding) share the same
// connection pool, retry policy, and metrics surface. Adding a new consumer
// means injecting this client, not opening a new one.
//
// --l1.rpc accepts a comma-separated list of endpoints, primary first. When
// more than one is given, failover happens inside the HTTP transport, so
// every consumer below keeps receiving a plain *ethclient.Client. See
// node/rpcfailover for what does and does not count as endpoint failure —
// notably, it assumes the caller only reads, which holds here.
l1RPC := ctx.GlobalString(flags.L1NodeAddr.Name)
if l1RPC == "" {
return fmt.Errorf("%s is required", flags.L1NodeAddr.Name)
}
l1Client, err := ethclient.Dial(l1RPC)
l1Client, err := rpcfailover.Dial(context.Background(), "L1", l1RPC, nodeConfig.Logger)
if err != nil {
return fmt.Errorf("dial l1 node error: %v", err)
}
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2 changes: 1 addition & 1 deletion node/flags/flags.go
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Expand Up @@ -60,7 +60,7 @@ var (

L1NodeAddr = cli.StringFlag{
Name: "l1.rpc",
Usage: "Address of L1 User JSON-RPC endpoint to use (eth namespace required)",
Usage: "Address of L1 User JSON-RPC endpoint to use (eth namespace required). Accepts a comma-separated list, primary first, to fail over when an endpoint stops answering; multiple endpoints must all be http(s)",
EnvVar: prefixEnvVar("L1_ETH_RPC"),
}

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