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tailgate.js
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var app = require('http').createServer(handler),
io = require('socket.io').listen(app, {log:false}),
fs = require('fs');
app.listen(8081);
var maxBuffer = 20000;
function handler (req, res) {
fs.readFile(__dirname + '/html/index.html',
function (err, data) {
if (err) {
res.writeHead(500);
return res.end('Error loading index.html');
}
res.writeHead(200);
res.end(data);
});
}
io.sockets.on('connection', function (socket) {
var currentWatcher;
var currentFilesize;
socket.emit('connected');
socket.on('openFile', function (data) {
fs.stat(data.filename, function(err, stat){
if(currentWatcher)
currentWatcher.close();
if(err) {
console.log(err);
socket.emit('error', err.toString());
return;
}
currentFilesize = stat.size;
var start = (stat.size > maxBuffer)?(stat.size - maxBuffer):0;
var stream = fs.createReadStream(data.filename,{start:start, end:stat.size});
stream.addListener("error",function(err){
socket.emit('error', err.toString());
});
stream.addListener("data", function(filedata){
filedata = filedata.toString('utf-8');
var lines;
if(filedata.length >= maxBuffer){
lines = filedata.slice(filedata.indexOf("\n")+1).split("\n");
} else {
lines = filedata.split("\n");
}
socket.emit('initialTextData',{ text : lines, filename: data.filename});
startWatching(data.filename, socket);
console.log('started watching '+data.filename);
});
});
});
function startWatching(filename, socket) {
currentWatcher = fs.watch(filename, function(event){
fs.stat(filename, function(err,stat){
if(err) {
console.log(err);
socket.emit('error', err.toString());
return;
}
if(currentFilesize > stat.size) {
socket.emit('fileReset',{filename:filename});
currentFilesize = stat.size;
return;
}
var stream = fs.createReadStream(filename, { start: currentFilesize, end: stat.size});
stream.addListener("error",function(err){
socket.emit('error', err.toString());
});
stream.addListener("data", function(filedata) {
socket.emit('continuousTextData',{ text : filedata.toString('utf-8').split("\n") });
currentFilesize = stat.size;
});
});
});
}
});