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
	# channel.prefetch(1)
	self.declarations = Apollo::Agent.declare_entities(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
			if(doc.nil? == false)
				puts "Same as #{doc.inspect}"
			end
		end

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

			# Publish
			declarations[:exchanges]["crawler"].publish(msg.to_json, :reply_to => "planner.crawled")
		end
	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 128

def fetch_queued_urls(opts={})
	fetching_count = Apollo::Model::QueuedUrl.where({:state => :fetching}).count
	
	if(fetching_count > 4)
		puts "Fetching too many URLs. Slowing down for a while ..."
		return
	end

	while get_url_count(:fetching) < 4
		url = get_next_url(opts)
		puts "SmartPlanner::fetch_queued_urls() - Queueing: #{url.inspect}"
		fetch_url(url, opts)
	end
end

#fetch_url(url, opts = {}) ⇒ Object 



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 114

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 123

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

#get_url_count(state, opts = {}) ⇒ Object 



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 110

def get_url_count(state, opts={})
	Apollo::Model::QueuedUrl.where({:state => state}).count
end

#run(opts = {}) ⇒ Object 



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# File 'lib/apollo_crawler/planner/smart_planner.rb', line 143

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

	return 0
end