cloud-red/src/components/runtime/lib/exec.js

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/**
 * Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

const child_process = require('child_process');
const { util } = require('../../util');

var events;

function logLines(id, type, data) {
  events.emit('event-log', {
    id: id,
    payload: { ts: Date.now(), data: data, type: type }
  });
}

module.exports = {
  init: function(_runtime) {
    events = _runtime.events;
  },
  run: function(command, args, options, emit) {
    var invocationId = util.generateId();

    emit &&
      events.emit('event-log', {
        ts: Date.now(),
        id: invocationId,
        payload: { ts: Date.now(), data: command + ' ' + args.join(' ') }
      });

    return new Promise((resolve, reject) => {
      let stdout = '';
      let stderr = '';
      const child = child_process.spawn(command, args, options);
      child.stdout.on('data', data => {
        const str = '' + data;
        stdout += str;
        emit && logLines(invocationId, 'out', str);
      });
      child.stderr.on('data', data => {
        const str = '' + data;
        stderr += str;
        emit && logLines(invocationId, 'err', str);
      });
      child.on('error', function(err) {
        stderr = err.toString();
        emit && logLines(invocationId, 'err', stderr);
      });
      child.on('close', code => {
        let result = {
          code: code,
          stdout: stdout,
          stderr: stderr
        };
        emit &&
          events.emit('event-log', {
            id: invocationId,
            payload: { ts: Date.now(), data: 'rc=' + code }
          });

        if (code === 0) {
          resolve(result);
        } else {
          reject(result);
        }
      });
    });
  }
};