Un-reference intervals and timeouts

package.json

@@ -1,6 +1,6 @@
 {
   "name": "memx",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "description": "Simple and fast memcached client",
   "main": "./dist/index.cjs",
   "module": "./dist/index.mjs",
@@ -28,14 +28,14 @@
   "author": "Juit Developers <[email protected]>",
   "license": "Apache-2.0",
   "devDependencies": {
-    "@plugjs/build": "^0.4.7",
-    "@types/chai": "^4.3.5",
-    "@types/chai-as-promised": "^7.1.5",
-    "@types/memjs": "^1.3.0",
-    "chai": "^4.3.7",
+    "@plugjs/build": "^0.5.22",
+    "@types/chai": "^4.3.11",
+    "@types/chai-as-promised": "^7.1.8",
+    "@types/memjs": "^1.3.3",
+    "chai": "<5.0.0",
     "chai-as-promised": "^7.1.1",
     "chai-exclude": "^2.1.0",
-    "memjs": "^1.3.1"
+    "memjs": "^1.3.2"
   },
   "directories": {
     "test": "test"

src/cluster.ts

@@ -2,8 +2,8 @@ import assert from 'node:assert'
 
 import { ServerAdapter } from './server'
 
-import type { Adapter, Counter, AdapterResult, Stats } from './types'
 import type { ServerOptions } from './server'
+import type { Adapter, AdapterResult, Counter, Stats } from './types'
 
 function parseHosts(hosts?: string): ServerOptions[] {
   const result: { host: string, port?: number }[] = []

src/connection.ts

@@ -1,14 +1,14 @@
 import assert from 'node:assert'
 import net from 'node:net'
 
-import { Encoder } from './encode'
-import { Decoder } from './decode'
 import { BUFFERS, OPCODE } from './constants'
+import { Decoder } from './decode'
+import { Encoder } from './encode'
 import { socketFinalizationRegistry } from './internals'
 
+import type { Socket } from 'node:net'
 import type { RawIncomingPacket } from './decode'
 import type { RawOutgoingPacket } from './encode'
-import type { Socket } from 'node:net'
 
 export type RawIncomingPackets = [ RawIncomingPacket, ...RawIncomingPacket[] ]
 
@@ -173,7 +173,7 @@ export class Connection {
       if (error) return deferred.reject(error)
     })
 
-    const timeout = setTimeout(() => deferred.reject(new Error('No response')), this.#timeout)
+    const timeout = setTimeout(() => deferred.reject(new Error('No response')), this.#timeout).unref()
 
     return deferred.promise.finally(() => {
       clearTimeout(timeout)

src/decode.ts

@@ -1,7 +1,7 @@
 import assert from 'node:assert'
 
-import { DATA_TYPE, EMPTY_BUFFER, MAGIC, OFFSETS } from './constants'
 import { allocateBuffer } from './buffers'
+import { DATA_TYPE, EMPTY_BUFFER, MAGIC, OFFSETS } from './constants'
 
 import type { RecyclableBuffer } from './buffers'
 

src/encode.ts

@@ -1,5 +1,5 @@
 import { allocateBuffer } from './buffers'
-import { DATA_TYPE, EMPTY_BUFFER, MAGIC, VBUCKET, OFFSETS } from './constants'
+import { DATA_TYPE, EMPTY_BUFFER, MAGIC, OFFSETS, VBUCKET } from './constants'
 
 import type { RecyclableBuffer } from './buffers'
 import type { OPCODE } from './constants'

src/fake.ts

@@ -204,7 +204,7 @@ export class FakeAdapter implements Adapter {
     if (! ttl) return this.#cache.clear()
 
     const wait = toExp(ttl) - Date.now()
-    setTimeout(() => this.#cache.clear(), wait)
+    setTimeout(() => this.#cache.clear(), wait).unref()
   }
 
   async noop(): Promise<void> {

src/index.ts

@@ -1,20 +1,15 @@
 export type { RecyclableBuffer } from './buffers'
 
+import * as connection from './connection'
+import * as constants from './constants'
 import * as decode from './decode'
 import * as encode from './encode'
-import * as constants from './constants'
-import * as connection from './connection'
 
-export {
-  decode,
-  encode,
-  constants,
-  connection,
-}
+export { connection, constants, decode, encode }
 
-export * from './fake'
-export * from './types'
+export * from './client'
 export * from './cluster'
+export * from './fake'
 export * from './server'
-export * from './client'
+export * from './types'
 export * from './utils'

src/server.ts

@@ -1,9 +1,9 @@
 import { Connection } from './connection'
 import { BUFFERS, OPCODE, STATUS } from './constants'
 
-import type { Adapter, Counter, AdapterResult, Stats } from './types'
 import type { ConnectionOptions } from './connection'
 import type { RawIncomingPacket } from './decode'
+import type { Adapter, AdapterResult, Counter, Stats } from './types'
 
 const statsBigInt: readonly string[] = [
   'auth_cmds', 'auth_errors', 'bytes', 'bytes_read', 'bytes_written', 'cas_badval', 'cas_hits', 'cas_misses',

src/utils.ts

@@ -135,7 +135,7 @@ export class PoorManLock {
     do {
       cas = await this.#client.add(this.#name, owner, { ttl: 2 })
       if (cas !== undefined) break
-      await new Promise((resolve) => setTimeout(resolve, 100))
+      await new Promise((resolve) => void setTimeout(resolve, 100).unref())
     } while (Date.now() < end)
 
     if (cas === undefined) {
@@ -154,7 +154,7 @@ export class PoorManLock {
         assert(replaced !== undefined, `Lock "${this.#client.prefix}${this.#name}" not replaced`)
         cas = replaced
       })(), `Error extending lock "${this.#client.prefix}${this.#name}"`)
-    }, 100)
+    }, 100).unref()
 
     try {
       return await executor()

test/01-decode.test.ts

@@ -2,7 +2,7 @@ import { randomFillSync } from 'node:crypto'
 
 import { expect } from 'chai'
 
-import { decode, constants } from '../src/index'
+import { constants, decode } from '../src/index'
 
 
 describe('Decoding Packets', () => {

test/02-encode.test.ts

@@ -1,6 +1,6 @@
 import { expect } from 'chai'
 
-import { encode, constants } from '../src/index'
+import { constants, encode } from '../src/index'
 
 describe('Encoding Packets', () => {
   it('should encode a packet with all information required', () => {

test/06-client.test.ts

@@ -3,7 +3,7 @@ import { randomBytes } from 'node:crypto'
 
 import { expect } from 'chai'
 
-import { MemxClient, ClusterAdapter, ServerAdapter } from '../src/index'
+import { ClusterAdapter, MemxClient, ServerAdapter } from '../src/index'
 
 import type { Adapter } from '../src/index'
 

test/10-utils.test.ts

@@ -1,9 +1,9 @@
 import { randomBytes } from 'node:crypto'
 
+import { exec } from '@plugjs/build'
 import { expect } from 'chai'
 
-
-import { Bundle, MemxClient, Factory, PoorManLock } from '../src/index'
+import { Bundle, Factory, MemxClient, PoorManLock } from '../src/index'
 
 describe('Utilities', () => {
   const host = process.env.MEMCACHED_HOST || '127.0.0.1'
@@ -273,5 +273,33 @@ describe('Utilities', () => {
       expect((await client.getc(key))?.value).to.be.undefined
       expect(record).to.eql([ 'create 1', 'create 2', 'start 1', 'end 1' ])
     }, 3000)
+
+    it('should acquire when another process holding the lock crashes', async () => {
+      const lockname = `distributed-${process.pid}-${Math.floor(Math.random() * 100000)}`
+      const child = exec('tsrun', './test/locker.ts', lockname)
+
+      // this should give the child process enough time to start and lock
+      await new Promise((resolve) => void setTimeout(resolve, 500))
+
+      // the first attempt to locking should fail, the child should be locking!
+      await expect(new PoorManLock(client, lockname).execute(() => {
+        log.error('Initial lock attempt succesful')
+      }, { timeout: 100, owner: `test-parent-${process.pid}` }))
+          .to.be.rejectedWith(/timeout/)
+
+      // the second attempt should succeed, once the child dies...
+      const p1 = new PoorManLock(client, lockname).execute(() => {
+        log('Parent process executing 1')
+      }, { owner: `test-parent-${process.pid}@1` })
+      const p2 = new PoorManLock(client, lockname).execute(() => {
+        log('Parent process executing 2')
+      }, { owner: `test-parent-${process.pid}@2` })
+      const p3 = new PoorManLock(client, lockname).execute(() => {
+        log('Parent process executing 3')
+      }, { owner: `test-parent-${process.pid}@3` })
+
+      // reap up the child's leftovers...
+      await Promise.all([ p1, p2, p3, child ])
+    }, 10000)
   })
 })

test/locker.ts

@@ -0,0 +1,27 @@
+/* eslint-disable no-console */
+import { log } from '@plugjs/build'
+
+import { MemxClient, PoorManLock } from '../src/index'
+
+const host = process.env.MEMCACHED_HOST || '127.0.0.1'
+const port = parseInt(process.env.MEMCACHED_PORT || '11211')
+const client = new MemxClient({ hosts: [ { host, port } ] })
+
+async function test(): Promise<void> {
+  console.log(`Child process using lock "${process.argv[2]}"`)
+
+  const lock = new PoorManLock(client, process.argv[2])
+  try {
+    await lock.execute(async () => {
+      console.log('Child process locking')
+      await new Promise((resolve) => void setTimeout(resolve, 2000))
+      console.log('Child process exiting')
+      process.exit(123)
+    }, { owner: `test-child-${process.pid}` })
+  } finally {
+    console.log('Child process exit interrupted ???')
+    process.exit(123)
+  }
+}
+
+test().catch((error) => log.error('Error in child process test', error))