roach

A very adaptable web crawler framework. Impossible to kill.

Roach

A very adaptable web crawler framework. Impossible to kill.

  1. Install the module via npm:
npm install roach
var Roach = require('roach');
 
var roach = new Roach();
 
// Use multiple transports with default options 
roach.use('rabbitmq').use('mongodb');
 
// Add a job to get all the 'a' links from google.com 
roach.addJob( 'http://google.com', 'google' ).filter( 'links' );
 
// run the job 
roach.run();
var Roach = require('roach'),
    Proxy = Roach.Proxy;
 
var roach = new Roach();
 
// Use multiple transports with default options 
roach.use('rabbitmq').use('mongodb');
 
var proxy = new Proxy( 'http://google.com', 'google' );
 
proxy.filter('links')
     .each(function(urlindex){
        roach.addJob(url, 'job:' + index)
             .filter('filters/xml_parser.js');
      })
     .run(function(){
        roach.run();
      });

Note: Custom filters need to end with .js (crappy I know, but it was tricky to automatically resolve your filters vs. our custom ones.)

var Roach = require('roach'),
    Proxy = Roach.Proxy;
 
var roach = new Roach();
 
var config = roach.config('config.json');
 
roach.use('redis', config.transports.redis);
 
var proxy = new Proxy( '/tmp', 'awesomesauce' );
 
// Use the Roach directory filter and a custom filter 
// to grab every .txt file the '/tmp' directory 
proxy.filter( 'directory' )
     .filter( 'filters/text_file.js' )
     .each(function(filepathindex){
 
        // Apply some custom filters to each job that  
        // gets created from each fetched file 
        roach.addJob(filepath, 'job:' + index)
             .filter('filters/special_error.js')
             .filter('filters/every_third_word.js');
     })
     .run(function(){
        roach.run();
     });

TODO

TODO

TODO

TODO

Roach has multiple transports that can be used to save your data somewhere. They all have default options that are specific to the individual transport. The options can be overridden by passing in an options object like so:

roach.use('rabbitmq', { host: '192.168.1.1', port: 8001 });

All the transports should adhere to the same basic interface and they pretty simple to implement so feel free to write your own!

This is as simple as it gets. It just spits stuff out to console. Useful for debugging or just piping results to a file.

Defaults:

{
    name : 'logger'
}
 

For saving to file system.

Defaults:

{
    path : path.resolve('/tmp'),
    name: 'file',
    filename: 'data:'
}
 

Saving to a single collection. No replica set support at the moment. Single DB only.

Defaults:

{
    protocol : 'mongo',
    name: 'mongodb',
    host : 'localhost',
    port : '27017',
    db: 'roach',
    collection: 'roach',
    safe: true
}
 

Obviously, saving to RabbitMQ.

Defaults:

{
    protocol : 'amqp',
    name: 'rabbitmq',
    host : 'localhost',
    port : '5672',
    exchange : {
        name: 'roach',
        options: {
            durable : true,
            confirm : true
        }
    },
    login: 'guest',
    password: 'guest',
    vhost: '/',
    routingKey: '#'
}

Saving to Redis. Right now this is tightly coupled to our own use case, so it currently saves a key to a set and then saves the key + a score + the data to a sorted set. We plan on abstracting so that you can determine your save method or override the default.

Defaults:

{
    protocol : 'redis',
    name: 'redis',
    host : 'localhost',
    port : 6379
}

We provide a few helpful utility libraries wrapped up in the Roach.Utils namespace. At the moment they are:

Creative Commons 3.0 - Attribution Sharealike

You can remix, copy or use for both commercial and non-commercial products and services but you need to provide attribution for the original work in the source code to "PetroFeed Inc.". You must also share the original or any derivative under the same license. A description of the license can be found here.


Proudly brought to you by PetroFeed.