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November 27, 2010 16:26
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`tail -f` in Node.js and WebSockets
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| .DS_Store | |
| *.log | |
| tmp/ |
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| [submodule "lib/socket.io"] | |
| path = lib/socket.io | |
| url = http://github.com/LearnBoost/Socket.IO.git | |
| [submodule "lib/socket.io-node"] | |
| path = lib/socket.io-node | |
| url = http://github.com/LearnBoost/Socket.IO-node.git |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>tail.js</title> | |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> | |
| <script src="/socket.io/socket.io.js"></script> | |
| <style> | |
| body | |
| { color: #1a2c37; | |
| font-family: 'Helvetica', sans-serif; font-size: 86%; | |
| padding: 2em; } | |
| #info | |
| { font-size: 120%; | |
| font-weight: bold; } | |
| #tail | |
| { border: 1px solid #ccc; | |
| height: 300px; | |
| padding: 0.5em; | |
| overflow: hidden; | |
| position: relative; | |
| overflow-y: scroll; } | |
| </style> | |
| </head> | |
| <body> | |
| <pre id="info"></pre> | |
| <pre id="tail"></pre> | |
| <script> | |
| var Application = function() { | |
| var socket = new io.Socket(null, {port: 8000}); | |
| socket.connect(); | |
| var lines = 0; | |
| socket.on('connect', function() { | |
| console.log('Connected to:', socket.host); | |
| }); | |
| socket.on('message', function(message) { | |
| console.log('Received message:', message); | |
| if (message.filename) { | |
| $('#info').html( '$ tail -f ' + message.filename ); | |
| }; | |
| if (message.tail) { | |
| $('#tail').html( $('#tail').html() + message.tail ); | |
| lines++ | |
| $('#tail').scrollTop(lines*100) | |
| } | |
| }); | |
| return { | |
| socket : socket | |
| }; | |
| }; | |
| $(function() { var app = Application(); }); | |
| </script> | |
| </body> | |
| </html> |
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| // =================================== | |
| // `tail -f` in Node.js and WebSockets | |
| // =================================== | |
| // | |
| // Usage: | |
| // | |
| // git clone git://gist.github.com/718035.git tail.js | |
| // cd tail.js | |
| // git submodule update --init | |
| // | |
| // node server.js /path/to/your.log | |
| // | |
| // Connect with browser and watch changes in the logfile | |
| // | |
| // | |
| require.paths.unshift('./lib/socket-io/lib/', | |
| './lib/socket.io-node/lib/'); | |
| var http = require('http'), | |
| io = require('socket.io'), | |
| fs = require('fs'); | |
| var spawn = require('child_process').spawn; | |
| var filename = process.ARGV[2]; | |
| if (!filename) return util.puts("Usage: node <server.js> <filename>"); | |
| // -- Node.js Server ---------------------------------------------------------- | |
| server = http.createServer(function(req, res){ | |
| res.writeHead(200, {'Content-Type': 'text/html'}) | |
| fs.readFile(__dirname + '/index.html', function(err, data){ | |
| res.write(data, 'utf8'); | |
| res.end(); | |
| }); | |
| }) | |
| server.listen(8000, '0.0.0.0'); | |
| // -- Setup Socket.IO --------------------------------------------------------- | |
| var io = io.listen(server); | |
| io.on('connection', function(client){ | |
| console.log('Client connected'); | |
| var tail = spawn("tail", ["-f", filename]); | |
| client.send( { filename : filename } ); | |
| tail.stdout.on("data", function (data) { | |
| console.log(data.toString('utf-8')) | |
| client.send( { tail : data.toString('utf-8') } ) | |
| }); | |
| }); | |
| console.log('Server running at http://0.0.0.0:8000/, connect with a browser to see tail output'); |
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Slightly modded version put here on Stack Overflow.... Thanks!
http://stackoverflow.com/a/34363535/26510