fix handle piece indexer not found response

backend/lib/piece-indexer-service.js

@@ -7,6 +7,10 @@ const PieceIndexerResponse = Type.Object({
   samples: Type.Array(Type.String())
 })
 
+const PieceIndexerErrorResponse = Type.Object({
+  error: Type.String()
+})
+
 /**
  * @param {string} providerId
  * @param {string} pieceCid
@@ -20,6 +24,14 @@ export const getDealPayloadCid = async (providerId, pieceCid) => {
       headers: { 'content-type': 'application/json' }
     }), { retries: 5 })
     const json = await response.json()
+
+    try {
+      const parsedPixResponse = Value.Parse(PieceIndexerErrorResponse, json)
+      if (parsedPixResponse.error === 'PROVIDER_OR_PIECE_NOT_FOUND') {
+        return null
+      }
+    } catch {}
+
     try {
       const parsedPixResponse = Value.Parse(PieceIndexerResponse, json)
       return parsedPixResponse.samples.length === 0

backend/test/piece-indexer-service.test.js

@@ -0,0 +1,12 @@
+import { it, describe } from 'node:test'
+import { getDealPayloadCid } from '../lib/piece-indexer-service.js'
+import assert from 'node:assert/strict'
+
+describe('piece-indexer-service', () => {
+  describe('integration', () => {
+    it('ignores missing deal payload cids', async () => {
+      const sample = await getDealPayloadCid('f0notfound', 'bafynotfound')
+      assert.strictEqual(sample, null)
+    })
+  })
+})