Collection of cross-platform routines for child process monitoring. Allows to keep track of creation, spawn and termination of a child process via events. Get information about command, arguments and options used to create a child process. Modify command,
npm install wprocesswatcherCollection of cross-platform routines for child process monitoring. Allows to keep track of creation, spawn and termination of a child process via events. Get information about command, arguments and options used to create a child process. Modify command, arguments or options on the creation stage. Access instance of ChildProcess on spawn and termination stages.
``
git clone https://github.com/Wandalen/wProcessWatcher
cd wProcessWatcher
will .npm.install
node sample/trivial/Sample.s
Make sure you have utility willbe installed. To install willbe: npm i -g willbe@stable. Willbe is required to build of the module.
`
npm add 'wprocesswatcher@stable'
Willbe is not required to use the module in your project as submodule.
##### Example
`javascript
let _ = require( 'wTools' );
_.include( 'wProcessWatcher' )
/ How to change default homedir for new child process by modifying original arguments /
var ChildProcess = require( 'child_process' );
var args = [ '-e', "console.log( require( 'os' ).homedir() )" ]
var options = { stdio : 'inherit', shell : true };
/ Spawn child process that will print homedir path before using process watcher /
console.log( 'Homedir before arguments patching:' );
ChildProcess.spawnSync( 'node', args, options, );
/ Enable process watcher and register callback that will be executed before spawning the child process /
function subprocessStartBegin( o )
{
o.arguments[ 2 ].env =
{
'USERPROFILE' : 'C:\\some\\path',
'HOME' : '/some/path'
}
}
_.process.watcherEnable();
_.process.on( 'subprocessStartBegin', subprocessStartBegin )
/ Spawn child process that will print new homedir path /
console.log( '\nHomedir after arguments patching:' );
ChildProcess.spawnSync( 'node', args, options );
/ Deregister callback and disable process watcher /
_.process.off( 'subprocessStartBegin', subprocessStartBegin )
_.process.watcherDisable();
/*
Output:
Homedir before arguments patching:
C:\Users\fov
Homedir after arguments patching:
C:\some\path
*/
``