Class: Apollo::Planner::SmartPlanner

Inherits:
BasePlanner show all
Defined in:
lib/apollo_crawler/planner/smart_planner.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(amqp = nil, mongo = nil, opts = {}) ⇒ SmartPlanner

Returns a new instance of SmartPlanner.



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 38

def initialize(amqp=nil, mongo=nil, opts={})
  self.amqp = amqp
  self.mongo = mongo

  # Declarations
  channel = amqp.create_channel
  self.declarations = Apollo::Agent.declare_exchanges(channel, opts)

  # Bindings
  declarations[:queues]["planner.fetched.queue"].bind(declarations[:exchanges]["planner.fetched"]).subscribe do |delivery_info, metadata, payload|
    msg = JSON.parse(payload)

    request = msg['request']
    response = msg['response']

    doc = Apollo::Model::QueuedUrl.find(request["_id"])
    doc.update_attributes(msg['request'])
    doc.state = :fetched
    doc.save

    doc = Apollo::Model::RawDocument.where(:url => request['url']).first
    if doc
      if doc.sha_hash != response['sha_hash']
        puts "Removing old cached version of '#{request['url']}'" if opts[:verbose]
        
        doc.destroy
        doc = nil
      else
        puts "Using cached version of '#{request['url']}'" if opts[:verbose]
      end
    else
      doc = Apollo::Model::RawDocument.where(:sha_hash => response['sha_hash']).first
    end

    if(doc.nil?)
      doc = Apollo::Model::RawDocument.new(response).save
    end

    # Publish
    declarations[:exchanges]["crawler"].publish(msg.to_json, :reply_to => "planner.crawled")
  end

  declarations[:queues]["planner.domained.queue"].bind(declarations[:exchanges]["planner.domained"]).subscribe do |delivery_info, metadata, payload|
    msg = JSON.parse(payload)

    puts "DOMAINED !!!"
  end

  declarations[:queues]["planner.crawled.queue"].bind(declarations[:exchanges]["planner.crawled"]).subscribe do |delivery_info, metadata, payload|
    msg = JSON.parse(payload)

    request = msg['request']
    response = msg['response']
    data = msg['data']
    links = msg['links']
    links = [] if links.nil?

    links.each do |url|
      link = url['link']
      
      Apollo::Scheduler::BaseScheduler::schedule(link, request['crawler_name'])
    end

    # puts JSON.pretty_generate(data)
    # puts JSON.pretty_generate(links)
  end
end

Instance Attribute Details

#amqp ⇒ Object

Returns the value of attribute amqp.



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 34

def amqp
  @amqp
end

#declarations ⇒ Object

Returns the value of attribute declarations.



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 36

def declarations
  @declarations
end

#mongo ⇒ Object

Returns the value of attribute mongo.



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 35

def mongo
  @mongo
end

Instance Method Details

#fetch_queued_urls(opts = {}) ⇒ Object 



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 119

def fetch_queued_urls(opts={})
  url = get_next_url(opts)
  
  while url
    puts url.inspect 
    # puts "Count of URLs in Queue: #{url.count}" if opts[:verbose]

    fetch_url(url, opts)

    url = get_next_url()
  end
end

#fetch_url(url, opts = {}) ⇒ Object 



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 106

def fetch_url(url, opts={})
  if(opts[:verbose])
    puts "AMQP fetching '#{url.inspect}'"
  end

  # Publish
  declarations[:exchanges]["fetcher"].publish(url.to_json, :reply_to => "planner.fetched")
end

#get_next_url(opts = {}) ⇒ Object 



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 115

def get_next_url(opts={})
  Apollo::Model::QueuedUrl.where({:state => :queued}).find_and_modify({ "$set" => { state: :fetching }}, new: true)
end

#run(opts = {}) ⇒ Object 



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 132

def run(opts={})
  request_exit = false
  
  while request_exit == false
    fetch_queued_urls(opts)
    sleep 1
  end

  return 0
end