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Spawn process #2

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merged 2 commits into from
May 25, 2014
Merged

Spawn process #2

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edabcf4
add route for command line child process
alexpopof May 20, 2014
80b3381
execute command line process and get return values as stream
alexpopof May 20, 2014
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3 changes: 2 additions & 1 deletion new_index.html
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
<!-- A sample where you can record your voice and it can be played back -->
<!-- Source: http://codeartists.com/post/36746402258/how-to-record-audio-in-chrome-with-native-html5-apis -->
<!-- Original source: http://codeartists.com/post/36746402258/how-to-record-audio-in-chrome-with-native-html5-apis -->
<!-- Adapted by Alex Popof for CS 224S - May 2014 -->
<html>
<body>
<audio controls autoplay></audio>
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31 changes: 31 additions & 0 deletions server.js
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,9 @@ var fs = require('fs');
var url = require('url');
var fs = require('fs');

var exec = require('child_process').exec;
var spawn = require('child_process').spawn;

var server = http.createServer(function(req,rep){
console.log('connection');
var path = url.parse(req.url).pathname;
Expand Down Expand Up @@ -82,6 +85,34 @@ var server = http.createServer(function(req,rep){
rep.end();
});
break;
// sample invocations of command line process (wc)
// http://stackoverflow.com/questions/20643470/execute-a-command-line-binary-in-node-js
// execute_all: fetches complete output
// execute_online: receives output as streams
case '/execute_all':
exec('wc recorder.js',
function (error, stdout, stderr) {
console.log('stdout: ' + stdout);
if (error !== null) {
console.log('exec error: ' + error);
}
});
rep.writeHead(200, {'Content-Type':'text/html'});
rep.write("<html><body>Executing command ... fetch complete output</body></html>");
rep.end();
break;
case '/execute_online':
// command and its list of args
var child = spawn('wc', ['recorderWorker.js', '-l']);
child.stdout.on('data', function(chunk) {
var returnedText = chunk.toString();
// need to parse buffer data bytes into ascii
console.log(returnedText);
});
rep.writeHead(200, {'Content-Type':'text/html'});
rep.write("<html><body>Executing command ... fetch in chunks</body></html>");
rep.end();
break;
default:
console.log("default path");
rep.writeHead(404);
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