Class: Fetch::UrlFetcher

Inherits:
Object
  • Object
show all
Defined in:
lib/url-fetcher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ UrlFetcher

Returns a new instance of UrlFetcher.



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# File 'lib/url-fetcher.rb', line 10

def initialize(options={})
  @url = get_url_params(options[:url]).scheme.nil? ? "http://#{options[:url]}" : options[:url] 
  @width = options[:width].nil? ? 100 : options[:width]
end

Instance Attribute Details

#image_urls ⇒ Object (readonly)

Returns the value of attribute image_urls.



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# File 'lib/url-fetcher.rb', line 8

def image_urls
  @image_urls
end

#title ⇒ Object (readonly)

Returns the value of attribute title.



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# File 'lib/url-fetcher.rb', line 8

def title
  @title
end

#url ⇒ Object

Returns the value of attribute url.



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# File 'lib/url-fetcher.rb', line 7

def url
  @url
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/url-fetcher.rb', line 8

def width
  @width
end

Instance Method Details

#find ⇒ Object

def custom_error

raise(Fetch::MyCustomException, 'Your custom error message here')

end



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# File 'lib/url-fetcher.rb', line 19

def find
  agent = Mechanize.new
  doc = agent.get(url)

  images = doc.parser.xpath("//img/@src | //a/img/@src").map {|a|
    unless get_url_params(a.value).nil?
      image_uri = a.value
      #if fetch uri is relative, we just add host name
      if is_related_uri?(image_uri)
        image_uri = url+image_uri
      end

      #check this uri has file extension
      unless has_extention?(image_uri).empty?
        image_sizes = calculate_img_size(image_uri)
        if image_sizes
          (image_sizes[0].to_i > width) ? image_uri : nil
        else
          return nil 
        end
      end
    end
  }

  @image_urls = images.compact
  @title = doc.title
end