pgte
Bubble 
Domains for the poor man.
Flow-control for cascading callbacks.
Aborts groups of callbacks.
With timeouts (if you will).
Inspired by substack/node-toss.
Example:
var bubble = require('bubble')
var timeout = 2000
require('http').createServer(function(req, res) {
var b = bubble(timeout, function(err, file_c_data) {
if (err) {
res.writeHead(500)
res.write(err.message)
} else {
res.end(file_c_data)
}
});
fs.readFile('./file_a', b(function(file_a_data) {
fs.readFile('./file_b', b(function(file_b_data) {
fs.readFile('./file_c', b())
})
}))
})You can also leave out the timeout:
var b = bubble(function(err, file_c_data) {
// ...
});
fs.readFile('./file_a', b(function(file_a_data) {
// ...
});
You can also leave out the last wrapper if you're not doing more IO and don't care about the callback values:
var bubble = require('bubble')
var timeout = 2000
require('http').createServer(function(req, res) {
var file_c_data;
var b = bubble(timeout, function(err) {
if (err) {
res.writeHead(500)
res.write(err.message)
} else {
res.end(file_c_data)
}
});
fs.readFile('./file_a', b(function(file_a_data) {
fs.readFile('./file_b', b(function(file_b_data) {
fs.readFile('./file_c', function(err, value) {
if (err) {
// handle error
}
file_c_data = data;
console.log('file ended, but bubble callback will be called anyway');
})
})
}))
})