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62 lines
1.4 KiB
62 lines
1.4 KiB
require 'base64'
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require 'logger'
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require 'uri'
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require 'nokogiri'
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require 'typhoeus'
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class GoogleMapLocationFetcher
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attr_accessor :base_map_url, :log
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def initialize
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@base_map_url = [
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'http://maps.googleapis.com/maps/api/staticmap',
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'?zoom=12',
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'&sensor=false',
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'&size=512x512',
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'&maptype=satellite',
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].join('')
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@log = Logger.new(
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File.expand_path('../log/map-crawler.log', File.dirname(__FILE__))
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)
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@log.level = Logger::INFO
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@log.formatter = lambda do |severity, time, prog, message|
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"#{time} - #{severity} - #{message}\n"
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end
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end
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def self.mapdump_callback(location, image)
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puts "Map '#{location}':"
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puts Base64.encode64(image)
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end
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def fetch(locations, &callback)
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callback ||= self.class.method(:mapdump_callback)
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hydra = Typhoeus::Hydra.new(:initial_pool_size => 26)
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locations.each do |location|
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request = Typhoeus::Request.new(
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"#{@base_map_url}¢er=#{URI.encode(location)}"
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)
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request.on_complete do |response|
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handle_response(response, location, &callback)
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end
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hydra.queue(request)
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end
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hydra.run
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end
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def handle_response(response, location, &callback)
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@log.info("Handling request at url #{response.effective_url}")
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if response.success? and response.headers_hash[:content_type] =~ /image\/.*/
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callback.call(location, response.body)
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else
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callback.call(location, '')
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end
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end
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end
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