feat: add proving retries (AztecProtocol#6145)

This PR adds retries to proving requests. This is especially needed when
building real proofs as those touch the filesystem (to generate keys,
move bytecode, write public inputs etc.) and that could fail for various
reasons.

yarn-project/prover-client/package.json

@@ -27,7 +27,7 @@
     "formatting": "run -T prettier --check ./src && run -T eslint ./src",
     "formatting:fix": "run -T eslint --fix ./src && run -T prettier -w ./src",
     "bb": "node --no-warnings ./dest/bb/index.js",
-    "test": "LOG_LEVEL=${LOG_LEVEL:-silent} DEBUG_COLORS=1 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --testTimeout=600000 --forceExit"
+    "test": "LOG_LEVEL=${LOG_LEVEL:-silent} DEBUG_COLORS=1 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --testTimeout=750000 --forceExit"
   },
   "jest": {
     "moduleNameMapper": {

yarn-project/prover-client/package.local.json

@@ -1,5 +1,5 @@
 {
   "scripts": {
-    "test": "LOG_LEVEL=${LOG_LEVEL:-silent} DEBUG_COLORS=1 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --testTimeout=600000 --forceExit"
+    "test": "LOG_LEVEL=${LOG_LEVEL:-silent} DEBUG_COLORS=1 NODE_NO_WARNINGS=1 node --experimental-vm-modules ../node_modules/.bin/jest --testTimeout=750000 --forceExit"
   }
 }

yarn-project/prover-client/src/prover-pool/memory-proving-queue.test.ts

@@ -45,14 +45,27 @@ describe('MemoryProvingQueue', () => {
     await expect(promise).resolves.toEqual(new RootParityInput(proof, vk, publicInputs));
   });
 
-  it('notifies of errors', async () => {
+  it('retries failed jobs', async () => {
     const inputs = makeBaseParityInputs();
-    const promise = queue.getBaseParityProof(inputs);
+    void queue.getBaseParityProof(inputs);
+
     const job = await queue.getProvingJob();
     expect(job?.request.inputs).toEqual(inputs);
 
     const error = new Error('test error');
+
     await queue.rejectProvingJob(job!.id, error);
+    await expect(queue.getProvingJob()).resolves.toEqual(job);
+  });
+
+  it('notifies errors', async () => {
+    const promise = queue.getBaseParityProof(makeBaseParityInputs());
+
+    const error = new Error('test error');
+    await queue.rejectProvingJob((await queue.getProvingJob())!.id, error);
+    await queue.rejectProvingJob((await queue.getProvingJob())!.id, error);
+    await queue.rejectProvingJob((await queue.getProvingJob())!.id, error);
+
     await expect(promise).rejects.toEqual(error);
   });
 });

yarn-project/prover-client/src/prover-pool/memory-proving-queue.ts

@@ -33,8 +33,11 @@ type ProvingJobWithResolvers<T extends ProvingRequest = ProvingRequest> = {
   id: string;
   request: T;
   signal?: AbortSignal;
+  attempts: number;
 } & PromiseWithResolvers<ProvingRequestResult<T['type']>>;
 
+const MAX_RETRIES = 3;
+
 export class MemoryProvingQueue implements CircuitProver, ProvingJobSource {
   private jobId = 0;
   private log = createDebugLogger('aztec:prover-client:prover-pool:queue');
@@ -95,7 +98,18 @@ export class MemoryProvingQueue implements CircuitProver, ProvingJobSource {
       return Promise.resolve();
     }
 
-    job.reject(err);
+    if (job.attempts < MAX_RETRIES) {
+      job.attempts++;
+      this.log.warn(
+        `Job id=${job.id} type=${ProvingRequestType[job.request.type]} failed with error: ${err}. Retry ${
+          job.attempts
+        }/${MAX_RETRIES}`,
+      );
+      this.queue.put(job);
+    } else {
+      this.log.error(`Job id=${job.id} type=${ProvingRequestType[job.request.type]} failed with error: ${err}`);
+      job.reject(err);
+    }
     return Promise.resolve();
   }
 
@@ -111,13 +125,16 @@ export class MemoryProvingQueue implements CircuitProver, ProvingJobSource {
       promise,
       resolve,
       reject,
+      attempts: 1,
     };
 
     if (signal) {
       signal.addEventListener('abort', () => reject(new AbortedError('Operation has been aborted')));
     }
 
-    this.log.info(`Adding ${ProvingRequestType[request.type]} proving job to queue`);
+    this.log.info(
+      `Adding id=${item.id} type=${ProvingRequestType[request.type]} proving job to queue depth=${this.queue.length()}`,
+    );
     // TODO (alexg) remove the `any`
     if (!this.queue.put(item as any)) {
       throw new Error();