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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| import fs from 'fs' | ||
| import AsyncLock from 'async-lock' | ||
|
|
||
| export class PersistentQueue<T> { | ||
| private queue: T[] = [] | ||
| private writeStream: fs.WriteStream | null = null | ||
| private initialized = false | ||
| private asyncLock = new AsyncLock({ maxPending: Number.MAX_SAFE_INTEGER }) | ||
| filepath = '' | ||
|
|
||
| constructor(filepath: string) { | ||
| this.filepath = filepath | ||
| this.queue = [] | ||
| this.loadQueue() | ||
| this.writeStream = fs.createWriteStream(this.filepath, { flags: 'a' }) | ||
| this.initialized = true | ||
| } | ||
|
|
||
| loadQueue() { | ||
| try { | ||
| if (!fs.existsSync(this.filepath)) { | ||
| return | ||
| } | ||
| const data = fs.readFileSync(this.filepath, { encoding: 'utf-8' }) | ||
| this.queue = JSON.parse(`[${data.split('\n').slice(0, -1).join(',')}]`) | ||
| } catch (error) { | ||
| if ((error as NodeJS.ErrnoException).code !== 'ENOENT') { | ||
| console.error('Failed to load queue:', error) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| lockQueue(cb: () => Promise<void>) { | ||
| return this.asyncLock.acquire( | ||
| this.filepath, | ||
| async (done) => { | ||
| await cb() | ||
| done() | ||
| }, | ||
| { skipQueue: true } | ||
| ) | ||
| } | ||
|
|
||
| flushQueue() { | ||
| return this.asyncLock.acquire( | ||
| this.filepath, | ||
| async (done) => { | ||
| this.writeStream?.end() | ||
| fs.truncate(this.filepath, 0, (err) => { | ||
| if (err) { | ||
| done() | ||
| throw err | ||
| } | ||
| this.queue = [] | ||
| this.writeStream = fs.createWriteStream(this.filepath, { flags: 'a' }) | ||
| done() | ||
| }) | ||
| }, | ||
| { skipQueue: true } | ||
| ) | ||
| } | ||
|
|
||
| async addToQueue(item: T) { | ||
| if (!this.initialized) { | ||
| return | ||
| } | ||
| await this.writeItemToFile(item) | ||
| this.queue.push(item) | ||
| } | ||
|
|
||
| writeItemToFile(item: T) { | ||
| return this.asyncLock.acquire(this.filepath, async (done) => { | ||
| const dataToWrite = JSON.stringify(item).trim().replace('\n', '') + '\n' | ||
| this.writeStream?.write(dataToWrite, 'utf8', (err) => { | ||
| if (err) { | ||
| done() | ||
| throw err | ||
| } else { | ||
| done() | ||
| } | ||
| }) | ||
| }) | ||
| } | ||
|
|
||
| getQueue() { | ||
| return this.queue | ||
| } | ||
| } |