crawler = CobwebCrawler.new(:cache => 600);
While the crawler is running, you can view statistics on http://localhost:4567stats = crawler.crawl(“http://www.pepsico.com”)
- :url – url of the resource requested
- :status_code – status code of the resource requested
- :mime_type – content type of the resource
- :character_set – character set of content determined from content type
- :length – length of the content returned
- :body – content of the resource
- :location – location header if returned
- :redirect_through – if your following redirects, any redirects are stored here detailing where you were redirected through to get to the final location
- :headers – hash or the headers returned
- :links – hash or links on the page split in to types
- :links – url’s from a tags within the resource
- :images – url’s from img tags within the resource
- :related – url’s from link tags
- :scripts – url’s from script tags
- :styles – url’s from within link tags with rel of stylesheet and from url() directives with stylesheets
Install crawler as a gem
gem install cobweb
Creates a new crawler object based on a base_url
- options – Options are passed in as a hash,
- :follow_redirects – transparently follows redirects and populates the :redirect_through key in the content hash (Default: true)
- :redirect_limit – sets the limit to be used for concurrent redirects (Default: 10)
- :processing_queue – specifies the processing queue for content to be sent to (Default: ContentProcessJob)
- :debug – enables debug output (Default: false)
- :quiet – hides default output (Default: false)
- :cache – sets the ttl for caching pages, set to nil to disable caching (Default: 300)
- :timeout – http timeout for requests (Default: 10)
- :redis_options – hash containing the initialization options for redis (e.g. {:host => “redis.mydomain.com”}) (Default: {})
- :internal_urls – array of strings representing internal url forms for your site (eg: [‘http://test.com/*’, ‘http://blog.test.com/*’, ‘http://externaltest.com/*’]) (Default: [], although your first url’s scheme, host and domain are added)
- :first_page_redirect_internal – if true and the first page crawled is a redirect, it will add the final destination of redirects to the internal_urls (e.g. http://www.test.com gets redirected to http://test.com) (Default: true)
- :crawl_id – the id used internally for identifying the crawl. Can be used by the processing job to seperate crawls
- :internal_urls – an array of urls with * wildcards that represent urls internal to the site (ie pages within the same domain)
- :external_urls – an array of urls with * wildcards that represent urls external to the site (overrides internal_urls)
- :obey_robots – boolean determining if robots.txt should be honoured. (default: false)
- :user_agent – user agent string to match in robots.txt (not sent as user_agent of requests yet) (default: cobweb)
- :crawl_limit_by_page – sets the crawl counter to only use html page types when counting objects crawled
- :valid_mime_types – an array of mime types that takes wildcards (eg ‘text/*’) defaults to [‘/’]
crawler = CobWeb.new(:follow_redirects => false)
Starts a crawl through resque. Requires the :processing_queue to be set to a valid class for the resque job to work with the data retrieved.
- base_url – the url to start the crawl from
Once the crawler starts, if the first page is redirected (eg from http://www.test.com to http://test.com) then the endpoint scheme, host and domain is added to the internal_urls automatically.
crawler.start(“http://www.google.com/”)
Simple get that obey’s the options supplied in new.
- url – url requested
crawler.get(“http://www.google.com/”)
Simple get that obey’s the options supplied in new.
- url – url requested
Feel free to contribute small or large bits of code, just please make sure that there are rspec test for the features your submitting. We also test on travis at http://travis-ci.org/#!/stewartmckee/cobweb if you want to see the state of the project. Continuous integration testing is performed by the excellent Travis: http://travis-ci.org/#!/stewartmckee/cobwebcrawler.head(“http://www.google.com/”)
- Tidy up classes with link parsing
- Refactoring of code to simplify design
- Remove requirement of redis from standalone crawler
- Add redis settings to standalone crawler (ie to connect to remote redis)
- Add ability to start and stop crawls from web interface
- Allow crawler to start as web interface only (ie not run crawls at start)
- Fix content encoding issue requiring separate process job
- DRY the cobweb get/head calls, its got a lot of duplication
- Investigate using event machine for single threaded crawling
- Refactor into a module and refactor class names to remove cobweb and increase simplicity
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