1 files changed, 332 insertions, 0 deletions
diff --git a/toolkit/jetpack/sdk/system/child_process.js b/toolkit/jetpack/sdk/system/child_process.js
new file mode 100644
index 000000000..8ea1f4f80
--- /dev/null
+++ b/toolkit/jetpack/sdk/system/child_process.js
@@ -0,0 +1,332 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+module.metadata = {
+  'stability': 'experimental'
+};
+
+var { Ci } = require('chrome');
+var subprocess = require('./child_process/subprocess');
+var { EventTarget } = require('../event/target');
+var { Stream } = require('../io/stream');
+var { on, emit, off } = require('../event/core');
+var { Class } = require('../core/heritage');
+var { platform } = require('../system');
+var { isFunction, isArray } = require('../lang/type');
+var { delay } = require('../lang/functional');
+var { merge } = require('../util/object');
+var { setTimeout, clearTimeout } = require('../timers');
+var isWindows = platform.indexOf('win') === 0;
+
+var processes = new WeakMap();
+
+
+/**
+ * The `Child` class wraps a subprocess command, exposes
+ * the stdio streams, and methods to manipulate the subprocess
+ */
+var Child = Class({
+  implements: [EventTarget],
+  initialize: function initialize (options) {
+    let child = this;
+    let proc;
+
+    this.killed = false;
+    this.exitCode = undefined;
+    this.signalCode = undefined;
+
+    this.stdin = Stream();
+    this.stdout = Stream();
+    this.stderr = Stream();
+
+    try {
+      proc = subprocess.call({
+        command: options.file,
+        arguments: options.cmdArgs,
+        environment: serializeEnv(options.env),
+        workdir: options.cwd,
+        charset: options.encoding,
+        stdout: data => emit(child.stdout, 'data', data),
+        stderr: data => emit(child.stderr, 'data', data),
+        stdin: stream => {
+          child.stdin.on('data', pumpStdin);
+          child.stdin.on('end', function closeStdin () {
+            child.stdin.off('data', pumpStdin);
+            child.stdin.off('end', closeStdin);
+            stream.close();
+          });
+          function pumpStdin (data) {
+            stream.write(data);
+          }
+        },
+        done: function (result, error) {
+          if (error)
+            return handleError(error);
+
+          // Only emit if child is not killed; otherwise,
+          // the `kill` method will handle this
+          if (!child.killed) {
+            child.exitCode = result.exitCode;
+            child.signalCode = null;
+
+            // If process exits with < 0, there was an error
+            if (child.exitCode < 0) {
+              handleError(new Error('Process exited with exit code ' + child.exitCode));
+            }
+            else {
+              // Also do 'exit' event as there's not much of
+              // a difference in our implementation as we're not using
+              // node streams
+              emit(child, 'exit', child.exitCode, child.signalCode);
+            }
+
+            // Emit 'close' event with exit code and signal,
+            // which is `null`, as it was not a killed process
+            emit(child, 'close', child.exitCode, child.signalCode);
+          }
+        }
+      });
+      processes.set(child, proc);
+    } catch (e) {
+      // Delay the error handling so an error handler can be set
+      // during the same tick that the Child was created
+      delay(() => handleError(e));
+    }
+
+    // `handleError` is called when process could not even
+    // be spawned
+    function handleError (e) {
+      // If error is an nsIObject, make a fresh error object
+      // so we're not exposing nsIObjects, and we can modify it
+      // with additional process information, like node
+      let error = e;
+      if (e instanceof Ci.nsISupports) {
+        error = new Error(e.message, e.filename, e.lineNumber);
+      }
+      emit(child, 'error', error);
+      child.exitCode = -1;
+      child.signalCode = null;
+      emit(child, 'close', child.exitCode, child.signalCode);
+    }
+  },
+  kill: function kill (signal) {
+    let proc = processes.get(this);
+    proc.kill(signal);
+    this.killed = true;
+    this.exitCode = null;
+    this.signalCode = signal;
+    emit(this, 'exit', this.exitCode, this.signalCode);
+    emit(this, 'close', this.exitCode, this.signalCode);
+  },
+  get pid() { return processes.get(this, {}).pid || -1; }
+});
+
+function spawn (file, ...args) {
+  let cmdArgs = [];
+  // Default options
+  let options = {
+    cwd: null,
+    env: null,
+    encoding: 'UTF-8'
+  };
+
+  if (args[1]) {
+    merge(options, args[1]);
+    cmdArgs = args[0];
+  }
+  else {
+    if (isArray(args[0]))
+      cmdArgs = args[0];
+    else
+      merge(options, args[0]);
+  }
+
+  if ('gid' in options)
+    console.warn('`gid` option is not yet supported for `child_process`');
+  if ('uid' in options)
+    console.warn('`uid` option is not yet supported for `child_process`');
+  if ('detached' in options)
+    console.warn('`detached` option is not yet supported for `child_process`');
+
+  options.file = file;
+  options.cmdArgs = cmdArgs;
+
+  return Child(options);
+}
+
+exports.spawn = spawn;
+
+/**
+ * exec(command, options, callback)
+ */
+function exec (cmd, ...args) {
+  let file, cmdArgs, callback, options = {};
+
+  if (isFunction(args[0]))
+    callback = args[0];
+  else {
+    merge(options, args[0]);
+    callback = args[1];
+  }
+
+  if (isWindows) {
+    file = 'C:\\Windows\\System32\\cmd.exe';
+    cmdArgs = ['/S/C', cmd || ''];
+  }
+  else {
+    file = '/bin/sh';
+    cmdArgs = ['-c', cmd];
+  }
+
+  // Undocumented option from node being able to specify shell
+  if (options && options.shell)
+    file = options.shell;
+
+  return execFile(file, cmdArgs, options, callback);
+}
+exports.exec = exec;
+/**
+ * execFile (file, args, options, callback)
+ */
+function execFile (file, ...args) {
+  let cmdArgs = [], callback;
+  // Default options
+  let options = {
+    cwd: null,
+    env: null,
+    encoding: 'utf8',
+    timeout: 0,
+    maxBuffer: 204800,    //200 KB (200*1024 bytes)
+    killSignal: 'SIGTERM'
+  };
+
+  if (isFunction(args[args.length - 1]))
+    callback = args[args.length - 1];
+
+  if (isArray(args[0])) {
+    cmdArgs = args[0];
+    merge(options, args[1]);
+  } else if (!isFunction(args[0]))
+    merge(options, args[0]);
+
+  let child = spawn(file, cmdArgs, options);
+  let exited = false;
+  let stdout = '';
+  let stderr = '';
+  let error = null;
+  let timeoutId = null;
+
+  child.stdout.setEncoding(options.encoding);
+  child.stderr.setEncoding(options.encoding);
+
+  on(child.stdout, 'data', pumpStdout);
+  on(child.stderr, 'data', pumpStderr);
+  on(child, 'close', exitHandler);
+  on(child, 'error', errorHandler);
+
+  if (options.timeout > 0) {
+    setTimeout(() => {
+      kill();
+      timeoutId = null;
+    }, options.timeout);
+  }
+
+  function exitHandler (code, signal) {
+
+    // Return if exitHandler called previously, occurs
+    // when multiple maxBuffer errors thrown and attempt to kill multiple
+    // times
+    if (exited) return;
+    exited = true;
+
+    if (!isFunction(callback)) return;
+
+    if (timeoutId) {
+      clearTimeout(timeoutId);
+      timeoutId = null;
+    }
+
+    if (!error && (code !== 0 || signal !== null))
+      error = createProcessError(new Error('Command failed: ' + stderr), {
+        code: code,
+        signal: signal,
+        killed: !!child.killed
+      });
+
+    callback(error, stdout, stderr);
+
+    off(child.stdout, 'data', pumpStdout);
+    off(child.stderr, 'data', pumpStderr);
+    off(child, 'close', exitHandler);
+    off(child, 'error', errorHandler);
+  }
+
+  function errorHandler (e) {
+    error = e;
+    exitHandler();
+  }
+
+  function kill () {
+    try {
+      child.kill(options.killSignal);
+    } catch (e) {
+      // In the scenario where the kill signal happens when
+      // the process is already closing, just abort the kill fail
+      if (/library is not open/.test(e))
+        return;
+      error = e;
+      exitHandler(-1, options.killSignal);
+    }
+  }
+
+  function pumpStdout (data) {
+    stdout += data;
+    if (stdout.length > options.maxBuffer) {
+      error = new Error('stdout maxBuffer exceeded');
+      kill();
+    }
+  }
+
+  function pumpStderr (data) {
+    stderr += data;
+    if (stderr.length > options.maxBuffer) {
+      error = new Error('stderr maxBuffer exceeded');
+      kill();
+    }
+  }
+
+  return child;
+}
+exports.execFile = execFile;
+
+exports.fork = function fork () {
+  throw new Error("child_process#fork is not currently supported");
+};
+
+function serializeEnv (obj) {
+  return Object.keys(obj || {}).map(prop => prop + '=' + obj[prop]);
+}
+
+function createProcessError (err, options = {}) {
+  // If code and signal look OK, this was probably a failure
+  // attempting to spawn the process (like ENOENT in node) -- use
+  // the code from the error message
+  if (!options.code && !options.signal) {
+    let match = err.message.match(/(NS_ERROR_\w*)/);
+    if (match && match.length > 1)
+      err.code = match[1];
+    else {
+      // If no good error message found, use the passed in exit code;
+      // this occurs when killing a process that's already closing,
+      // where we want both a valid exit code (0) and the error
+      err.code = options.code != null ? options.code : null;
+    }
+  }
+  else
+    err.code = options.code != null ? options.code : null;
+  err.signal = options.signal || null;
+  err.killed = options.killed || false;
+  return err;
+}