child-process

I have a node.js application that receives a file, via a web request and then will apply a conversion process to this file. Since the task is long running this needs to run separate to the main thread. At the moment I have just called the necessary code via a setTimeout() call. To isolate the main application from the conversion process I would like to move it out into a child process, since it is long running and I would like to isolate the main code from the work being done (am I worrying too much?). At the moment I am calling: const execFile = require('child_process').execFile; const child

Microsoft played safe here. In their article, "Creating a Child Process with Redirected Input and Output" , they are saying: The remaining open handles are cleaned up when this process terminates. To avoid resource leaks in a larger application, close handles explicitly. Which is perfectly useless. What handles? In which process? I want to get my head around it. When a handle is created in parent process with SECURITY_ATTRIBUTES.bInheritHandle = TRUE , a child process can see and use it, and the handle has the same value and access rights in both processes. But is it the same handle, or is it

I would like to use custom stream to handle child_process.spawn stdio. For example const cp = require('child_process'); const process = require('process'); const stream = require('stream'); var customStream = new stream.Stream(); customStream.on('data', function (chunk) { console.log(chunk); }); cp.spawn('ls', [], { stdio: [null, customStream, process.stderr] }); I get error Incorrect value for stdio stream . There is documentation for child_process.spawn https://nodejs.org/api/child_process.html#child_process_options_stdio . It says for stdio options that it can take Stream object Stream

I'm spawning npm install -g create-react-app from a js script. I want to know if it's possible to get the progress of the installation using spawn . const npmExecutable = /^win/.test(process.platform) ? "npm.cmd" : "npm"; const npm = spawn(npmExecutable, ["install", "-g", "create-react-app"]); I have read this question about using: npm.on("message", data => { console.log(`A message: ${data}`); }); but it does not show anything. There is a related question , about knowing the progress of a python script, but it does not have any answers. Does someone of you have tried something like that or

Let's say I have a parent.js containing a method named parent var childProcess = require('child_process'); var options = { someData: {a:1, b:2, c:3}, asyncFn: function (data, callback) { /*do other async stuff here*/ } }; function Parent(options, callback) { var child = childProcess.fork('./child'); child.send({ method: method, options: options }); child.on('message', function(data){ callback(data,err, data,result); child.kill(); }); } Meanwhile in child.js process.on('message', function(data){ var method = data.method; var options = data.options; var someData = options.someData; var asyncFn =

I need to create token with Stripe.js in React JS, but I can't find any easy way. In node.js I would do something like this: stripeClient.tokens.create({ card: { number: '4242424242424242', exp_month: 12, exp_year: 2050, cvc: '123' } But the Stripe npm module doesn't work for me in React JS. I'm getting error: Cannot resolve module 'child_process' So since this is node pibrary obviously, I would like to use <script type="text/javascript" src="https://js.stripe.com/v2/"></script> But I'm not sure what should be the best practice to implement external libraries in React You can just go ahead and

I have some Perl code that executes a shell script for multiple parameters, to simplify, I'll just assume that I have code that looks like this: for $p (@a){ system("/path/to/file.sh $p&"); } I'd like to do some more things after that, but I can't find a way to wait for all the child processes to finish before continuing. Converting the code to use fork() would be difficult. Isn't there an easier way? Using fork/exec/wait isn't so bad: my @a = (1, 2, 3); for my $p (@a) { my $pid = fork(); if ($pid == -1) { die; } elsif ($pid == 0) { exec '/bin/sleep', $p or die; } } while (wait() != -1) {}