From 341f4510830f169653f47a3428037c612fdd0e36 Mon Sep 17 00:00:00 2001
From: Shude Li <islishude@gmail.com>
Date: Tue, 25 Aug 2020 16:38:56 +0800
Subject: [PATCH] graphql: add support for retrieving the chain id (#21451)

---
 graphql/graphql.go | 4 ++++
 graphql/schema.go  | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/graphql/graphql.go b/graphql/graphql.go
index 1479ae7fdb..559da8aaaa 100644
--- a/graphql/graphql.go
+++ b/graphql/graphql.go
@@ -1044,6 +1044,10 @@ func (r *Resolver) ProtocolVersion(ctx context.Context) (int32, error) {
 	return int32(r.backend.ProtocolVersion()), nil
 }
 
+func (r *Resolver) ChainID(ctx context.Context) (hexutil.Big, error) {
+	return hexutil.Big(*r.backend.ChainConfig().ChainID), nil
+}
+
 // SyncState represents the synchronisation status returned from the `syncing` accessor.
 type SyncState struct {
 	progress ethereum.SyncProgress
diff --git a/graphql/schema.go b/graphql/schema.go
index 5dec10db20..d7b253f227 100644
--- a/graphql/schema.go
+++ b/graphql/schema.go
@@ -314,6 +314,8 @@ const schema string = `
         protocolVersion: Int!
         # Syncing returns information on the current synchronisation state.
         syncing: SyncState
+        # ChainID returns the current chain ID for transaction replay protection.
+        chainID: BigInt!
     }
 
     type Mutation {