feat(filecoin-api): allow custom hashing function to be passed to aggregate builder

packages/filecoin-api/package.json

@@ -162,7 +162,7 @@
     "@ucanto/transport": "^9.1.1",
     "@web3-storage/capabilities": "workspace:^",
     "@web3-storage/content-claims": "^5.0.0",
-    "@web3-storage/data-segment": "^4.0.0",
+    "@web3-storage/data-segment": "^5.2.0",
     "fr32-sha2-256-trunc254-padded-binary-tree-multihash": "^3.3.0",
     "p-map": "^6.0.0"
   },

packages/filecoin-api/src/aggregator/api.ts

@@ -1,6 +1,6 @@
 import type { Signer, Principal, Link } from '@ucanto/interface'
 import { InclusionProof } from '@web3-storage/capabilities/types'
-import { PieceLink } from '@web3-storage/data-segment'
+import { PieceLink, API as DataSegmentAPI } from '@web3-storage/data-segment'
 import {
   AggregatorService,
   DealerService,
@@ -327,6 +327,7 @@ export interface AggregateConfig {
   minAggregateSize: number
   minUtilizationFactor: number
   prependBufferedPieces?: BufferedPiece[]
+  hasher?: DataSegmentAPI.SyncMultihashHasher<DataSegmentAPI.SHA256_CODE>
 }
 
 // Enums

packages/filecoin-api/src/aggregator/buffer-reducing.js

@@ -152,11 +152,7 @@ export async function handleBufferReducingWithoutAggregate({
  * Attempt to build an aggregate with buffered pieces within ranges.
  *
  * @param {BufferedPiece[]} bufferedPieces
- * @param {object} config
- * @param {number} config.maxAggregateSize
- * @param {number} config.minAggregateSize
- * @param {number} config.minUtilizationFactor
- * @param {BufferedPiece[]} [config.prependBufferedPieces]
+ * @param {import('./api.js').AggregateConfig} config
  */
 export function aggregatePieces(bufferedPieces, config) {
   // Guarantee buffered pieces total size is bigger than the minimum utilization
@@ -175,6 +171,7 @@ export function aggregatePieces(bufferedPieces, config) {
   // Create builder with maximum size and try to fill it up
   const builder = Aggregate.createBuilder({
     size: Aggregate.Size.from(config.maxAggregateSize),
+    hasher: config.hasher,
   })
 
   // add pieces to an aggregate until there is no more space, or no more pieces

packages/filecoin-api/src/aggregator/events.js

@@ -115,6 +115,7 @@ export const handleBufferQueueMessage = async (context, records) => {
     minAggregateSize: context.config.minAggregateSize,
     minUtilizationFactor: context.config.minUtilizationFactor,
     prependBufferedPieces: context.config.prependBufferedPieces,
+    hasher: context.config.hasher,
   })
 
   // Store buffered pieces if not enough to do aggregate and re-queue them