Generic web crawler powered by Node.js
npm install node-spidernode-spider
=======
Generic web crawler powered by Node.js
$ npm install node-spider
js
var Spider = require('node-spider');var spider = new Spider({
// How many requests can be run in parallel
concurrent: 5,
// How long to wait after each request
delay: 0,
// A stream to where internal logs are sent, optional
logs: process.stderr,
// Re-visit visited URLs, false by default
allowDuplicates: false,
// If
true all queued handlers will be try-catch'd, errors go to error callback
catchErrors: true,
// If true the spider will set the Referer header automatically on subsequent requests
addReferrer: false,
// If true adds the X-Requested-With:XMLHttpRequest header
xhr: false,
// If true adds the Connection:keep-alive header and forever option on request module
keepAlive: false,
// Called when there's an error, throw will be used if none is provided
error: function(err, url) {
},
// Called when there are no more requests
done: function() {
}, //- All options are passed to
request module, for example:
headers: { 'user-agent': 'node-spider' },
encoding: 'utf8'
});var handleRequest = function(doc) {
// new page crawled
console.log(doc.res); // response object
console.log(doc.url); // page url
// uses cheerio, check its docs for more info
doc.$('a').each(function(i, elem) {
// do stuff with element
var href = doc.$(elem).attr('href').split('#')[0];
var url = doc.resolve(href);
// crawl more
spider.queue(url, handleRequest);
});
};
// start crawling
spider.queue('http://google.com/', handleRequest);
``Copyright (c) 2014, Ariel Flesler
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
* Neither the name of the {organization} nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.