Move to promises

Closes https://github.com/Chocobozzz/PeerTube/issues/74

server/helpers/core-utils.ts

@@ -4,6 +4,20 @@
 */
 
 import { join } from 'path'
+import { pseudoRandomBytes } from 'crypto'
+import {
+  readdir,
+  readFile,
+  rename,
+  unlink,
+  writeFile,
+  access
+} from 'fs'
+import * as mkdirp from 'mkdirp'
+import * as bcrypt from 'bcrypt'
+import * as createTorrent from 'create-torrent'
+import * as openssl from 'openssl-wrapper'
+import * as Promise from 'bluebird'
 
 function isTestInstance () {
   return process.env.NODE_ENV === 'test'
@@ -14,9 +28,82 @@ function root () {
   return join(__dirname, '..', '..', '..')
 }
 
+function promisify0<A> (func: (cb: (err: any, result: A) => void) => void): () => Promise<A> {
+  return function promisified (): Promise<A> {
+    return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
+      func.apply(null, [ (err: any, res: A) => err ? reject(err) : resolve(res) ])
+    })
+  }
+}
+
+// Thanks to https://gist.github.com/kumasento/617daa7e46f13ecdd9b2
+function promisify1<T, A> (func: (arg: T, cb: (err: any, result: A) => void) => void): (arg: T) => Promise<A> {
+  return function promisified (arg: T): Promise<A> {
+    return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
+      func.apply(null, [ arg, (err: any, res: A) => err ? reject(err) : resolve(res) ])
+    })
+  }
+}
+
+function promisify1WithVoid<T> (func: (arg: T, cb: (err: any) => void) => void): (arg: T) => Promise<void> {
+  return function promisified (arg: T): Promise<void> {
+    return new Promise<void>((resolve: () => void, reject: (err: any) => void) => {
+      func.apply(null, [ arg, (err: any) => err ? reject(err) : resolve() ])
+    })
+  }
+}
+
+function promisify2<T, U, A> (func: (arg1: T, arg2: U, cb: (err: any, result: A) => void) => void): (arg1: T, arg2: U) => Promise<A> {
+  return function promisified (arg1: T, arg2: U): Promise<A> {
+    return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
+      func.apply(null, [ arg1, arg2, (err: any, res: A) => err ? reject(err) : resolve(res) ])
+    })
+  }
+}
+
+function promisify2WithVoid<T, U> (func: (arg1: T, arg2: U, cb: (err: any) => void) => void): (arg1: T, arg2: U) => Promise<void> {
+  return function promisified (arg1: T, arg2: U): Promise<void> {
+    return new Promise<void>((resolve: () => void, reject: (err: any) => void) => {
+      func.apply(null, [ arg1, arg2, (err: any) => err ? reject(err) : resolve() ])
+    })
+  }
+}
+
+const readFilePromise = promisify2<string, string, string>(readFile)
+const readFileBufferPromise = promisify1<string, Buffer>(readFile)
+const unlinkPromise = promisify1WithVoid<string>(unlink)
+const renamePromise = promisify2WithVoid<string, string>(rename)
+const writeFilePromise = promisify2<string, any, void>(writeFile)
+const readdirPromise = promisify1<string, string[]>(readdir)
+const mkdirpPromise = promisify1<string, string>(mkdirp)
+const pseudoRandomBytesPromise = promisify1<number, Buffer>(pseudoRandomBytes)
+const accessPromise = promisify1WithVoid<string|Buffer>(access)
+const opensslExecPromise = promisify2WithVoid<string, any>(openssl.exec)
+const bcryptComparePromise = promisify2<any, string, boolean>(bcrypt.compare)
+const bcryptGenSaltPromise = promisify1<number, string>(bcrypt.genSalt)
+const bcryptHashPromise = promisify2<any, string|number, string>(bcrypt.hash)
+const createTorrentPromise = promisify2<string, any, any>(createTorrent)
+
 // ---------------------------------------------------------------------------
 
 export {
   isTestInstance,
-  root
+  root,
+
+  promisify0,
+  promisify1,
+  readdirPromise,
+  readFilePromise,
+  readFileBufferPromise,
+  unlinkPromise,
+  renamePromise,
+  writeFilePromise,
+  mkdirpPromise,
+  pseudoRandomBytesPromise,
+  accessPromise,
+  opensslExecPromise,
+  bcryptComparePromise,
+  bcryptGenSaltPromise,
+  bcryptHashPromise,
+  createTorrentPromise
 }