Class: CobwebCrawlHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/cobweb_crawl_helper.rb

Overview

The crawl class gives easy access to information about the crawl, and gives the ability to stop a crawl

Constant Summary collapse

BATCH_SIZE = 
200
FINISHED = 
"Finished"
STARTING = 
"Starting"
CANCELLED = 
"Cancelled"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ CobwebCrawlHelper

Returns a new instance of CobwebCrawlHelper.



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# File 'lib/cobweb_crawl_helper.rb', line 11

def initialize(data)
  @data = data
  
  # TAKING A LONG TIME TO RUN ON PRODUCTION BOX
  @stats = Stats.new(data)
end

Instance Attribute Details

#id ⇒ Object

Returns the value of attribute id.



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# File 'lib/cobweb_crawl_helper.rb', line 4

def id
  @id
end

Instance Method Details

#destroy(options = {}) ⇒ Object 



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# File 'lib/cobweb_crawl_helper.rb', line 18

def destroy(options={})
  
  options[:queue_name] = "cobweb_crawl_job" unless options.has_key?(:queue_name)
  options[:finished_resque_queue] = CobwebFinishedJob unless options.has_key?(:finished_resque_queue)
  
  # set status as cancelled now so that we don't enqueue any further pages
  self.statistics.end_crawl(@data, true)
  
  if options[:finished_resque_queue]
    
    additional_stats = {:crawl_id => id, :crawled_base_url => @stats.redis.get("crawled_base_url")}
    additional_stats[:redis_options] = @data[:redis_options] unless @data[:redis_options] == {}
    additional_stats[:source_id] = options[:source_id] unless options[:source_id].nil?
    
    Resque.enqueue(options[:finished_resque_queue], @stats.get_statistics.merge(additional_stats))
  end
  
  counter = 0
  while(counter < 200) do
    break if self.statistics.get_status == CANCELLED
    sleep 1
    counter += 1
  end
  position = Resque.size(options[:queue_name])
  until position == 0
    position-=BATCH_SIZE
    position = 0 if position < 0
    job_items = Resque.peek(options[:queue_name], position, BATCH_SIZE)
    job_items.each do |item|
      if item["args"][0]["crawl_id"] == id
        # remove this job from the queue
        Resque.dequeue(CrawlJob, item["args"][0])
      end
    end
  end
  
end

#statistics ⇒ Object 



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# File 'lib/cobweb_crawl_helper.rb', line 56

def statistics
  @stats
end

#status ⇒ Object 



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# File 'lib/cobweb_crawl_helper.rb', line 60

def status
  statistics.get_status
end