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node-red/packages/node_modules/@node-red/util/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.
**/
/**
* Run system commands with event-log integration
* @mixin @node-red/util_exec
*/
const child_process = require('child_process');
const events = require("./events");
const util = require('./util');
function logLines(id,type,data) {
events.emit("event-log", {id:id,payload:{ts: Date.now(),data:data,type:type}});
}
module.exports = {
/**
* Run a system command with stdout/err being emitted as 'event-log' events
* on the @node-red/util/events handler.
*
* The main arguments to this function are the same as passed to `child_process.spawn`
*
* @param {String} command - the command to run
* @param {Array} args - arguments for the command
* @param {Object} options - options to pass child_process.spawn
* @param {Boolean} emit - whether to emit events to the event-log for each line of stdout/err
* @return {Promise} A promise that resolves (rc=0) or rejects (rc!=0) when the command completes. The value
* of the promise is an object of the form:
*
* {
* code: <exit code>,
* stdout: <standard output from the command>,
* stderr: <standard error from the command>
* }
* @memberof @node-red/util_exec
*/
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);
}
});
})
}
}