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Merge pull request #135 from Sebastian-Webster/own-filelock-implement…
…ation Use homemade lock file system
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,22 +1,73 @@ | ||
| import { checkSync } from "proper-lockfile"; | ||
| import fsPromises from 'fs/promises'; | ||
| import { InternalServerOptions } from "../../types"; | ||
|
|
||
| export function waitForLock(path: string, options: InternalServerOptions): Promise<void> { | ||
| return new Promise(async (resolve, reject) => { | ||
| let retries = 0; | ||
| while (retries <= options.lockRetries) { | ||
| retries++ | ||
| const mtimeUpdateIntervalTime = 2_000 | ||
| const mtimeLimit = 10_000 | ||
|
|
||
| export async function waitForLock(path: string, options: InternalServerOptions): Promise<void> { | ||
| const lockPath = `${path}.lock` | ||
| let retries = 0; | ||
|
|
||
| do { | ||
| retries++; | ||
| try { | ||
| const stat = await fsPromises.stat(lockPath) | ||
| if (performance.now() - stat.mtime.getTime() > mtimeLimit) { | ||
| return | ||
| } else { | ||
| await new Promise(resolve => setTimeout(resolve, options.lockRetryWait)) | ||
| } | ||
| } catch (e) { | ||
| if (e.code === 'ENOENT') { | ||
| return | ||
| } else { | ||
| throw e | ||
| } | ||
| } | ||
| } while(retries <= options.lockRetries) | ||
|
|
||
| throw `lockRetries has been exceeded. Lock had not been released after ${options.lockRetryWait} * ${options.lockRetries} (${options.lockRetryWait * options.lockRetries}) milliseconds.` | ||
| } | ||
|
|
||
| function setupMTimeEditor(lockPath: string): () => Promise<void> { | ||
| const interval = setInterval(async () => { | ||
| try { | ||
| const time = new Date(); | ||
| await fsPromises.utimes(lockPath, time, time) | ||
| } catch {} | ||
| }, mtimeUpdateIntervalTime) | ||
|
|
||
| return async () => { | ||
| clearInterval(interval) | ||
| await fsPromises.rmdir(lockPath) | ||
| } | ||
| } | ||
|
|
||
| export async function lockFile(path: string): Promise<() => Promise<void>> { | ||
| const lockPath = `${path}.lock` | ||
| try { | ||
| await fsPromises.mkdir(lockPath) | ||
| return setupMTimeEditor(lockPath) | ||
| } catch (e) { | ||
| if (e.code === 'EEXIST') { | ||
| try { | ||
| const locked = checkSync(path, {realpath: false}); | ||
| if (!locked) { | ||
| return resolve() | ||
| const stat = await fsPromises.stat(lockPath) | ||
| if (performance.now() - stat.mtime.getTime() > mtimeLimit) { | ||
| return setupMTimeEditor(lockPath) | ||
| } else { | ||
| await new Promise(resolve => setTimeout(resolve, options.lockRetryWait)) | ||
| throw 'LOCKED' | ||
| } | ||
| } catch (e) { | ||
| return reject(e) | ||
| if (e.code === 'ENOENT') { | ||
| //This will run if the lock gets released after the EEXIST error is thrown but before the stat is checked. | ||
| //If this is the case, the lock acquisition should be retried. | ||
| return await lockFile(path) | ||
| } else { | ||
| throw e | ||
| } | ||
| } | ||
| } else { | ||
| throw e | ||
| } | ||
| reject(`lockRetries has been exceeded. Lock had not been released after ${options.lockRetryWait} * ${options.lockRetries} milliseconds.`) | ||
| }) | ||
| } | ||
| } |
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