Created
July 2, 2015 12:30
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Stream examples
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var Readable = require('stream').Readable | |
var Writable = require('stream').Writable | |
var Transform = require('stream').Transform | |
var a = new Readable({ objectMode: true }) | |
var b = new Transform({ objectMode: true }) | |
var c = new Writable({ objectMode: true }) | |
a.counter = 0 | |
a._read = function (size) { | |
size = this.counter + size | |
var that = this | |
if (this.counter > 50) { | |
setImmediate(this.push.bind(this, null)) | |
return | |
} | |
console.log('READ -->', size, this.counter) | |
for (; this.counter < size; this.counter ++) { | |
(function (count) { | |
console.log('PUSHING -->', count) | |
setImmediate(function () { | |
that.push({ | |
value: count | |
}) | |
}) | |
})(this.counter) | |
} | |
} | |
b._transform = function (chunk, enc, cb) { | |
console.log('TRANSFORM -->', chunk) | |
chunk.newPro = 'something-' + chunk.value | |
this.push(chunk) | |
cb() | |
} | |
c._write = function (chunk, enc, cb) { | |
console.log('_write called', chunk) | |
setImmediate(function () { | |
console.log('WRITE -->', chunk) | |
cb() | |
}) | |
} | |
a.pipe(b).pipe(c) |
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var net = require('net') | |
var through = require('through2') | |
net.createServer(function (socket) { | |
socket.pipe(through(process)).pipe(socket) | |
}).listen(4242) | |
function process (chunk, enc, cb) { | |
var string = chunk.toString().toUpperCase() | |
console.dir(string) | |
this.push(string, 'utf8') | |
cb() | |
} |
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