Separate Shomei RPC for Linea

src/linea/LineaProver.ts

@@ -1,4 +1,4 @@
-import type { HexString, HexString32, ProofRef } from '../types.js';
+import type { HexString, HexString32, ProofRef, Provider } from '../types.js';
 import { BlockProver, makeStorageKey, type TargetNeed } from '../vm.js';
 import { ZeroAddress, ZeroHash } from 'ethers/constants';
 import { withResolvers, toPaddedHex, isRPCError } from '../utils.js';
@@ -15,7 +15,8 @@ export class LineaProver extends BlockProver {
   static readonly isContract = isContract;
   static readonly encodeProof = encodeProof;
   static readonly latest = this._createLatest();
-  stateRoot?: HexString32;
+  shomeiProvider: Provider | undefined;
+  stateRoot: HexString32 | undefined;
   override async fetchStateRoot() {
     if (!this.stateRoot) throw new Error(`unknown stateRoot`);
     return this.stateRoot;
@@ -159,13 +160,15 @@ export class LineaProver extends BlockProver {
   }
   async fetchProofs(target: HexString, slots: bigint[] = []) {
     const ps: Promise<RPCLineaGetProof>[] = [];
+    const provider = this.shomeiProvider ?? this.provider;
     for (let i = 0; ; ) {
       ps.push(
         // 20240825: most cloud providers seem to reject batched getProof
         // since we aren't in control of provider construction (ie. batchMaxSize)
         // sendImmediate is a temporary hack to avoid this issue
         // 20241027: use GatewayProvider
-        this.provider.send('linea_getProof', [
+        // 20240227: add optional separate provider
+        provider.send('linea_getProof', [
           target,
           slots
             .slice(i, (i += this.proofBatchSize))

src/linea/LineaRollup.ts

@@ -11,6 +11,7 @@ import type {
   ProofSequence,
 } from '../types.js';
 import { Contract, EventLog } from 'ethers/contract';
+import { JsonRpcProvider } from 'ethers/providers';
 import { LineaProver } from './LineaProver.js';
 import { ROLLUP_ABI } from './types.js';
 import { CHAINS } from '../chains.js';
@@ -57,6 +58,22 @@ export class LineaRollup extends AbstractRollup<LineaCommit> {
     firstCommitV3: 6391917n,
   };
 
+  protected _shomeiProvider: JsonRpcProvider | undefined;
+
+  // "linea_getProof" is implemented by https://github.com/Consensys/shomei/
+  // https://documenter.getpostman.com/view/27370530/2s93ebTr7h#8c98cbd9-5c3b-4e1a-8d8e-790a2a9ab305
+  // this appears to be implemented as a passthru rpc call
+  // if we know the URL directly, we can avoid an extra hop
+  // TODO: acquire a direct shomei rpc url
+  setShomeiURL(url: string | undefined) {
+    this._shomeiProvider = url
+      ? new JsonRpcProvider(url, 1, {
+          staticNetwork: true,
+          batchMaxCount: 1, // batching not supported
+        })
+      : undefined;
+  }
+
   readonly firstCommitV3: bigint | undefined;
   readonly L1MessageService: Contract;
   constructor(providers: ProviderPair, config: LineaConfig) {
@@ -127,6 +144,7 @@ export class LineaRollup extends AbstractRollup<LineaCommit> {
     }
     const prover = new LineaProver(this.provider2, index);
     prover.stateRoot = stateRoot;
+    prover.shomeiProvider = this._shomeiProvider;
     return { index, startIndex, stateRoot, prevStateRoot, prover };
   }
   override encodeWitness(