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through-logged

Through stream that logs to console everything that passes through it.

Logged though stream

Build Status

Synopsis

Through stream that logs to console everything that passes through it. Use it as a quick debuuging tool by inserting in at a right point of a pipeline to see what is passing through.

Description

Let say that you have the following pipeline

    var spawn =  require('child_process').spawn,
        child = require('event-stream').child,
        filed = require('filed');
        filed('/etc/passwd').pipe(child(spawn('grep',['odysseas']))
                            .pipe(child(spawn('wc', ['-l']));

and you are wondering what is being piped through the grep process to the wc - and do so without affecting the rest of the program. You can do :

    var throughLogged = require('through-logged');
    ....
        filed('/etc/passwd').pipe(child(spawn('grep',['odysseas']))
                            .pipe(throughLogged())  // we inserted the logger here. 
                            .pipe(child(spawn('wc', ['-l']));

which will print to the output the greped lines - before passed to wc.

The code of this module is tiny:

var tee = require('tee-1'),
    consoleStream = require('console-stream');
 
function throughLogged() {
    return tee(consoleStream());
}
module.exports = throughLogged;

Installation

npm install through-logged