feat: add optional stateOverride parameter validation to eth_call (#4420)

Signed-off-by: Logan Nguyen <[email protected]>

Author: quiet-node

packages/relay/src/lib/eth.ts

@@ -968,6 +968,7 @@ export class EthImpl implements Eth {
   @rpcParamValidationRules({
     0: { type: 'transaction', required: true },
     1: { type: 'blockParams', required: true },
+    2: { type: 'stateOverride', required: false },
   })
   @cache({
     skipParams: [{ index: '1', value: constants.NON_CACHABLE_BLOCK_PARAMS }],

packages/relay/src/lib/validators/types.ts

@@ -150,6 +150,14 @@ export const TYPES = {
     },
     error: 'Expected TracerConfigWrapper which contains a valid TracerType and/or TracerConfig',
   },
+  stateOverride: {
+    test: (param: any) => {
+      // Must be an object if provided
+      // TODO: This validation should be more detailed when state override is officially supported.
+      return typeof param === 'object' && !Array.isArray(param);
+    },
+    error: 'Expected StateOverride object (currently accepting any object structure)',
+  },
 } satisfies {
   [paramTypeName: string]: {
     test: (param: any) => boolean;

packages/server/tests/acceptance/rpc_batch3.spec.ts

@@ -2094,6 +2094,7 @@ describe('@api-batch-3 RPC Server Acceptance Tests', function () {
           data: '0x70a082310000000000000000000000006E0d01A76C3Cf4288372a29124A26D4353EE51BE',
         },
         'latest',
+        {},
         null,
       ],
       eth_getTransactionByHash: ['0x4cc9a77780cf0e6d0dc75373bf00e3437db450ede45cb51b5da936fb46342c99', null],