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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,66 +1,69 @@ | ||
| /* eslint-disable header/header */ | ||
| import { default as fastq } from 'fastq'; | ||
| import type { queueAsPromised } from 'fastq'; | ||
| import * as winston from 'winston'; | ||
| import { createHash } from 'crypto'; | ||
| import { pipeline } from 'stream/promises'; | ||
| import { isMainThread, parentPort } from 'worker_threads'; | ||
|
|
||
| import { ContiguousDataSource, MatchableItem } from '../types.js'; | ||
| import { GatewayDataSource } from '../data/gateway-data-source.js'; | ||
| import { currentUnixTimestamp } from '../lib/time.js'; | ||
| import logger from '../log.js'; | ||
| import { FsDataStore } from '../store/fs-data-store.js'; | ||
| import { WorkerMessage, wrapWorkerFn } from './worker-thead.js'; | ||
|
|
||
| const DEFAULT_WORKER_COUNT = 4; | ||
| export type PrefetchJobBody = { | ||
| id: string; | ||
| }; | ||
|
|
||
| export class DataPrefetcher { | ||
| // Dependencies | ||
| private log: winston.Logger; | ||
| private contiguousDataSource: ContiguousDataSource; | ||
| // private indexWriter: DataItemIndexWriter; | ||
| // seperate deps, as we can't load the DB. | ||
| const dataStore = new FsDataStore({ log: logger, baseDir: 'data/contiguous' }); | ||
| const dataSource = new GatewayDataSource({ | ||
| log: logger, | ||
| trustedGatewayUrl: 'https://arweave.net', | ||
| }); | ||
|
|
||
| // Data indexing queue | ||
| private queue: queueAsPromised<MatchableItem, void>; | ||
| export async function prefetchTransaction( | ||
| job: PrefetchJobBody, | ||
| ): Promise<PrefetchJobReturnBody> { | ||
| const txId = job.id; | ||
| const log = logger.child({ worker: 'transaction-prefetch', txId: txId }); | ||
| const then = performance.now(); | ||
| log.verbose(`Prefetching ${txId}`); | ||
|
|
||
| constructor({ | ||
| log, | ||
| // indexWriter, | ||
| contiguousDataSource, | ||
| workerCount = DEFAULT_WORKER_COUNT, | ||
| }: { | ||
| log: winston.Logger; | ||
| // indexWriter: DataItemIndexWriter; | ||
| contiguousDataSource: ContiguousDataSource; | ||
| workerCount?: number; | ||
| }) { | ||
| this.log = log.child({ class: 'DataPrefetcher' }); | ||
| // this.indexWriter = indexWriter; | ||
| this.contiguousDataSource = contiguousDataSource; | ||
|
|
||
| this.queue = fastq.promise(this.prefetchData.bind(this), workerCount); | ||
| } | ||
|
|
||
| async queuePrefetchData(item: MatchableItem): Promise<void> { | ||
| const log = this.log.child({ | ||
| method: 'queueDataItem', | ||
| id: item.id, | ||
| }); | ||
| log.debug('Queueing item for prefetching...'); | ||
| this.queue.push(item); | ||
| log.debug('Data item queued for prefetching.'); | ||
| } | ||
| const data = await dataSource.getData(txId); | ||
| const hasher = createHash('sha256'); | ||
| const cacheStream = await dataStore.createWriteStream(); | ||
| const dataStream = data.stream; | ||
| data.stream.on('data', (chunk) => { | ||
| hasher.update(chunk); | ||
| }); | ||
| data.stream.pause(); | ||
| await pipeline(dataStream, cacheStream); | ||
| const hash = hasher.digest('base64url'); | ||
| await dataStore.finalize(cacheStream, hash); | ||
| log.verbose( | ||
| `Prefetched ${txId} in ${((performance.now() - then) / 1000).toFixed(3)}s`, | ||
| ); | ||
| return { | ||
| id: txId, | ||
| dataRoot: undefined, | ||
| hash, | ||
| dataSize: data.size, | ||
| contentType: data.sourceContentType, | ||
| cachedAt: currentUnixTimestamp(), | ||
| }; | ||
| } | ||
|
|
||
| async prefetchData(item: MatchableItem): Promise<void> { | ||
| const log = this.log.child({ | ||
| method: 'indexDataItem', | ||
| id: item.id, | ||
| }); | ||
| export type PrefetchJobReturnBody = { | ||
| id: string; | ||
| dataRoot?: string; | ||
| hash: string; | ||
| dataSize: number; | ||
| contentType?: string; | ||
| cachedAt?: number; | ||
| }; | ||
|
|
||
| try { | ||
| log.debug('Prefetching data item...'); | ||
| const res = await this.contiguousDataSource.getData(item.id); | ||
| const stream = res.stream; | ||
| // you have to consume the stream so it actually caches the item fully. | ||
| for await (const _ of stream) { | ||
| true; // void it | ||
| } | ||
| log.debug('Data item prefetched.'); | ||
| } catch (error) { | ||
| log.error('Failed to prefetch data item data:', error); | ||
| } | ||
| } | ||
| if (!isMainThread) { | ||
| parentPort?.on('message', (msg: WorkerMessage<PrefetchJobBody>) => | ||
| wrapWorkerFn(prefetchTransaction, msg), | ||
| ); | ||
| } | ||
|
|
||
| // export default prefetchTransaction; |
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