fix: add missing feedIndexNext fields (#991)

Author: Cafe137

src/feed/index.ts

@@ -178,6 +178,7 @@ export function makeFeedReader(requestOptions: BeeRequestOptions, topic: Topic,
     return {
       payload: update.payload,
       feedIndex,
+      feedIndexNext: feedIndex.next(),
     }
   }
 
@@ -198,6 +199,7 @@ export function makeFeedReader(requestOptions: BeeRequestOptions, topic: Topic,
     return {
       payload,
       feedIndex,
+      feedIndexNext: feedIndex.next(),
     }
   }
 
@@ -213,6 +215,7 @@ export function makeFeedReader(requestOptions: BeeRequestOptions, topic: Topic,
     return {
       reference: new Reference(payload.payload.toUint8Array()),
       feedIndex: payload.feedIndex,
+      feedIndexNext: payload.feedIndexNext ?? payload.feedIndex.next(),
     }
   }
 

src/utils/typed-bytes.ts

@@ -195,9 +195,11 @@ export class Topic extends Bytes {
   }
 }
 
+const MAX_UINT64 = new Uint8Array(8).fill(0xff, 0, 8)
+
 export class FeedIndex extends Bytes {
   static readonly LENGTH = 8
-  static readonly MINUS_ONE = new FeedIndex(new Uint8Array(8).fill(0xff, 0, 8))
+  static readonly MINUS_ONE = new FeedIndex(MAX_UINT64)
 
   constructor(bytes: Uint8Array | string | Bytes) {
     super(bytes, 8)
@@ -210,4 +212,12 @@ export class FeedIndex extends Bytes {
   toBigInt(): bigint {
     return Binary.uint64ToNumber(this.bytes, 'BE')
   }
+
+  next(): FeedIndex {
+    if (Binary.equals(this.bytes, MAX_UINT64)) {
+      return FeedIndex.fromBigInt(0n)
+    }
+
+    return FeedIndex.fromBigInt(this.toBigInt() + 1n)
+  }
 }

test/integration/stamp.spec.ts

@@ -21,10 +21,10 @@ test('GET batches', async () => {
 })
 
 test('POST stamps', async () => {
-  const response = await bee.createPostageBatch('670000000', 17, { waitForUsable: true })
+  const response = await bee.createPostageBatch('780000000', 17, { waitForUsable: true })
   expect(response.toHex()).toHaveLength(64)
 
-  await bee.topUpBatch(response, '670000000')
+  await bee.topUpBatch(response, '780000000')
 
   await System.waitFor(
     async () => {

test/unit/feed-index.spec.ts

@@ -0,0 +1,12 @@
+import { FeedIndex } from '../../src'
+
+test('FeedIndex.next', () => {
+  expect(FeedIndex.fromBigInt(0n).next().toBigInt()).toBe(1n)
+
+  expect(FeedIndex.MINUS_ONE.next().toBigInt()).toBe(0n)
+  expect(FeedIndex.MINUS_ONE.next().toBigInt()).toBe(0n) // no mutation
+
+  const feedIndex = FeedIndex.fromBigInt(137n)
+  expect(feedIndex.next().next().next().toBigInt()).toBe(140n)
+  expect(feedIndex.toBigInt()).toBe(137n) // no mutation
+})