Class: Apollo::CrawlerProgram

Inherits:
BaseProgram show all
Defined in:
lib/apollo_crawler/program/crawler_program.rb

Constant Summary

Constants inherited from BaseProgram

BaseProgram::CONFIG_DIR, BaseProgram::DEFAULT_OPTIONS

Instance Attribute Summary

Attributes inherited from BaseProgram

#amqp, #config, #mongo, #options, #optparser

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BaseProgram

get_config_path, #init_amqp, #init_mongo, #init_seeds, #init_seeds_crawlers, #load_config, #load_configs, require_files

Constructor Details

#initialize ⇒ CrawlerProgram

Initializer - Constructor



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 70

def initialize
	super
	
	@options = {}

	at_exit { 
		at_exit_handler
	}
end

Class Method Details

.console_table(headings, rows) ⇒ Object

Show tabular data in form of CLI table



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 98

def self.console_table(headings, rows)
	rows = rows.map do |o| 
		i = o.new

		res = []
		headings.each do |h|
			res << i.instance_eval(h)
		end
		res
	end

	table = Terminal::Table.new :headings => headings, :rows => rows
	puts table
end

.get_modules_paths(modules = APOLLO_CRAWLER_MODULES) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 80

def self.get_modules_paths(modules = APOLLO_CRAWLER_MODULES)
	res = modules.map do |name|
		Dir[File.join(APOLLO_CRAWLER_BASE_DIR, name, "*.rb")].each do |path|
			path
		end
	end

	res.flatten.sort
end

.register_modules(modules = APOLLO_CRAWLER_MODULES) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 90

def self.register_modules(modules = APOLLO_CRAWLER_MODULES)
	get_modules_paths(modules).each do |file| 
		# puts "Adding module '#{file}'"
		require file
	end
end

Instance Method Details

#at_exit_handler ⇒ Object

At Exit handler



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 511

def at_exit_handler()
	# if(@options[:verbose])
	# 	puts "Running at_exit_handler" 
	# end

	# TODO: Flush caches
	# TODO: End gracefully

	# Force exit event machine
	# EventMachine.stop
end

#generate_crawler(name, url = nil, matcher = nil, options = @options) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 265

def generate_crawler(name, url = nil, matcher = nil, options = @options)
	name = name.titleize.gsub(" ", "")

	if(@options[:verbose])
		puts "Generating new crawler '#{name}'"
	end

	template_path = RbConfig::CRAWLER_TEMPLATE_PATH
	puts template_path
	if(File.exists?(template_path) == false)
		puts "Template file '#{template_path}' does not exists!"
		return -1
	end

	if(options[:verbose])
		puts "Using template '#{template_path}'"
	end

	unless(options[:silent])
		dest_path = File.join(Dir.pwd, "#{name.underscore}.rb")
	end

	url = url ? url : "http://some-url-here"
	matcher = matcher ? matcher : "//a"
	
	placeholders = {
		"CRAWLER_CLASS_NAME" => name,
		"CRAWLER_NAME" => name.titleize,
		"CRAWLER_URL"  => url,
		"CRAWLER_MATCHER" => matcher
	}

	puts "Generating crawler '#{name.titleize}', class: '#{name}', path: '#{dest_path}'"

	File.open(template_path, 'r') do |tmpl|
		File.open(dest_path, 'w') do |crawler|  
			while line = tmpl.gets  
				#puts line
				placeholders.each do |k, v|
					line.gsub!(k, v)
				end
				
				crawler.puts line
			end  
		end
	end  

	return 0
end

#get_crawlers(args, options = @options) ⇒ Object

Get crawlers passd to cmd-line



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 363

def get_crawlers(args, options = @options)
	crawlers = []
	if(args.length > 0)
		crawlers << args.shift
	end

	if(options[:run_all])
		crawlers = @crawlers.keys
	end

	return crawlers
end

#get_crawlers_by_name(crawlers, crawler_classes = Apollo::Crawler::BaseCrawler.subclasses) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 315

def get_crawlers_by_name(crawlers, crawler_classes = Apollo::Crawler::BaseCrawler.subclasses)
	res = []
	crawlers.each do |crawler|
		next if crawler.nil?

		crawler_classes.each do |klass|
			next if klass.nil?

			crawler_name = crawler.to_s.split('::').last.downcase
			klass_name = klass.to_s.split('::').last.downcase.gsub("crawler", "")

			# puts "#{crawler_name} => #{klass_name}"

			if crawler_name == klass_name || crawler_name == "#{klass_name}crawler"
				res << klass
				break
			end
		end
	end
	res
end

#init_additional_crawlers(dirs) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 401

def init_additional_crawlers(dirs)
	# puts "Initializing aditional crawlers ..."
	dirs.each do |dir|
		if(@options[:verbose])
			puts "Registering additional crawler dir '#{dir}'"
		end

		Dir.glob("#{dir}/*.rb").each do |f| 
			if(@options[:verbose])
				puts "Registering crawler '#{f}'"
			end
			require f
		end
	end
end

#init_options ⇒ Object

Initialize command-line options



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 114

def init_options()
	@options[:env] = Apollo::ENV	

	@options[:doc_limit] = nil
	@options[:verbose] = false
	@options[:version] = nil
	
	@options[:cache_dirs] = [
		RbConfig::CACHES_DIR
	]
	
	@options[:crawler_dirs] = [
		RbConfig::CRAWLERS_DIR
	]
	
	@options[:formatter_dirs] = [
		RbConfig::FORMATTERS_DIR
	]

	@options[:generate_crawler] = nil
end

#init_options_parser ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 136

def init_options_parser()
	@optparser = OptionParser.new do | opts |
		opts.banner = "Usage: apollo-crawler [OPTIONS] CRAWLER_NAME [START_URL]"

		opts.separator ""
    			opts.separator "Specific options:"

		# This displays the help screen, all programs are
		# assumed to have this option.
		opts.on('-h', '--help', 'Display this screen') do
			@options[:show_help] = true
		end

		opts.on('-a', '--all', 'Run all crawlers') do
			@options[:run_all] = true
		end	

		opts.on('-e', '--environment [NAME]', "Environment used, default '#{@options[:env]}'") do |name|
			@options[:env] = name
		end

		opts.on('-f', '--format [NAME]', "Formatter used") do |name|
			@options[:formatter] = name
		end

		opts.on('-g', '--generate [NAME]', "Generate scaffold for new crawler") do |name|
			@options[:generate_crawler] = name
		end

		opts.on('-i', '--include [PATH]', 'Include additional crawler or crawler directory') do |path|
			@options[:crawler_dirs] << path

			init_additional_crawlers([path])
		end

		opts.on('-n', '--doc-limit [NUM]', 'Limit count of documents to be processed') do |count|
			@options[:doc_limit] = count.to_i
		end

		opts.on('-v', '--verbose', 'Enable verbose output') do
			@options[:verbose] = true
		end

		opts.on('-V', '--version', 'Show version info') do
			@options[:version] = true
		end

		opts.on('-l', '--list-crawlers', 'List of crawlers') do
			@options[:list_crawlers] = true
		end

		opts.on(nil, '--list-formatters', 'List of formatters available') do
			@options[:list_formatters] = true
		end			

		# opts.on('-q', '--query [QUERY]', 'Query crawler database for phrase') do |query|
		# 	@options[:query] = query
		# end	

		opts.on('-s', '--silent', 'Silent mode - do not print processed document') do
			@options[:silent] = true
		end	
	end
end

#init_program(args) ⇒ Object

Init program



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 418

def init_program(args)
	init_options()
	init_options_parser()

	CrawlerProgram.register_modules()

	parse_options(args)

	init_program_directory(RbConfig::PROGRAM_DIRECTORY, RbConfig::PROGRAM_DIRECTORIES)

	load_config_file()

	res = process_options(args)
	if res != nil
		return res
	end

	return nil
end

#init_program_directory(base_dir = RbConfig::PROGRAM_DIRECTORY, dirs = RbConfig::PROGRAM_DIRECTORIES, options = @options) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 376

def init_program_directory(base_dir = RbConfig::PROGRAM_DIRECTORY, dirs = RbConfig::PROGRAM_DIRECTORIES, options = @options)			
	dirs.each do |dir|
		if(File.directory?(dir) == false)
			if(options[:verbose])
				puts "Creating '#{dir}'"
			end

			FileUtils.mkpath(dir)
		end
	end

	init_user_config_file(File.join(File.dirname(__FILE__), 'config_user.trb'), File.join(base_dir, 'config.rb'))			
end

#init_user_config_file(config_path, dest_path, options = @options) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 390

def init_user_config_file(config_path, dest_path, options = @options)
	# Create user config file
	if(File.exists?(config_path) && File.exists?(dest_path) == false)
		if(options[:verbose])
			puts "Creating user config file '#{config_path}' => '#{dest_path}'"
		end

		FileUtils.cp(config_path, dest_path)
	end
end

#load_config_file(config = RbConfig::PROGRAM_CONFIG_PATH) ⇒ Object

Load global options first Merge it with local options (if they exists)



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 247

def load_config_file(config = RbConfig::PROGRAM_CONFIG_PATH)
	if(File.exists?(config))
		if(@options[:verbose])
			puts "Loading config '#{config}'"
		end
		
		require config
	else
		if(@options[:verbose])
			# TODO: Add support for initial rake task generation
			#          Something like this:
			#          rake config:init # Initializes config files with
			#            their defaults (if not exists already)        
			puts "Default config does not exist, skipping - '#{config}'"
		end
	end
end

#parse_options(args = ARGV) ⇒ Object

Parse the options passed to command-line



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 202

def parse_options(args = ARGV)
	# Parse the command-line. Remember there are two forms
	# of the parse method. The 'parse' method simply parses
	# ARGV, while the 'parse!' method parses ARGV and removes
	# any options found there, as well as any parameters for
	# the options. What's left is the list of files to resize.
	@optparser.parse!(args)
end

#process_docs_handler(docs, options = options, formatter) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 492

def process_docs_handler(docs, options = options, formatter)
	if(docs.nil?)
		return docs
	end

	if(docs.kind_of?(Array) == false)
		docs = [docs]
	end

	if options[:silent] != true
		docs.each do |doc|
			puts formatter.format(doc)
		end
	end

	return docs
end

#process_options(args) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 211

def process_options(args)
	if(@options[:version])
		puts Apollo::VERSION
		return 0
	end

	if(@options[:show_help])
		puts @optparser
		return 0
	end

	if(@options[:generate_crawler])
		name = @options[:generate_crawler]
		url = args.length > 0 ? args[0] : nil
		matcher = args.length > 1 ? args[1] : nil
		
		return self.generate_crawler(name, url, matcher)
	end

	if(@options[:list_formatters])
		objs = Apollo::Formatter::BaseFormatter.subclasses
		CrawlerProgram.console_table(['name', 'self.class'], objs)
		return 0
	end

	if(@options[:list_crawlers])
		objs = Apollo::Crawler::BaseCrawler.subclasses
		CrawlerProgram.console_table(['name', 'self.class'], objs)
		return 0
	end

	return nil
end

#request_exit(code = 0) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 482

def request_exit(code = 0)
	begin
		exit(0)
	rescue SystemExit => e
		# puts "rescued a SystemExit exception, reason: '#{e.to_s}'"
	end

	return code
end

#run(args = ARGV) ⇒ Object

Run Program



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 447

def run(args = ARGV)
	res_code = init_program(args)

	if res_code.nil? == false
		return request_exit(res_code)
	end

	if(@options[:verbose])
		puts "Running environment '#{@options[:env]}'"
	end

	# Look for query
	if(@options[:query])
		res_code = run_query(@options[:query], @options)
		return request_exit(res_code)
	end

	# Parse remaining arguments as crawlers
	crawler_names = get_crawlers(args)
	if(crawler_names.nil? || crawler_names.empty?)
		puts @optparser
		return request_exit(0)
	end	

	# Get crawlers by their names
	crawlers = get_crawlers_by_name(crawler_names, Apollo::Crawler::BaseCrawler.subclasses)
	if(crawlers.nil? || crawlers.empty?)
		puts @optparser
		return request_exit(0)
	end	

	res_code = run_crawlers(crawlers, args, @options)
	return request_exit(res_code)
end

#run_crawlers(crawlers, args, options = @options) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 337

def run_crawlers(crawlers, args, options = @options)
	crawlers.each do |crawler|
		if(options[:verbose])
			puts "Running '#{crawler}'"
		end

		opts = {
			:doc_limit => options[:doc_limit]
		}

		# Run crawlers
		instance = crawler.new

		if(args.nil? || args.empty?)
			args = instance.url
		end

		res = instance.etl(args, opts) do | docs |
			process_docs_handler(docs, options, Apollo::Formatter::JsonFormatter.new)
		end
	end

	return 0
end

#run_query(query, options = {}) ⇒ Object 



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# File 'lib/apollo_crawler/program/crawler_program.rb', line 438

def run_query(query, options = {})
	if(options[:verbose])
		puts "Investigating query '#{query}'"
	end

	return 0
end