Class: Plumnailer::CachingFetcher

Inherits:
Fetcher
  • Object
show all
Defined in:
lib/plumnailer/caching_fetcher.rb

Overview

Fetch the contents of a url and cache result on filesystem.

Constant Summary

Constants inherited from Fetcher

Fetcher::RedirectLimit

Instance Attribute Summary collapse

Attributes inherited from Fetcher

#user_agent

Instance Method Summary collapse

Constructor Details

#initialize(cache_dir) ⇒ CachingFetcher

Returns a new instance of CachingFetcher.



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# File 'lib/plumnailer/caching_fetcher.rb', line 11

def initialize(cache_dir)
  @cache_dir = cache_dir
  FileUtils.mkdir_p cache_dir
end

Instance Attribute Details

#cache_dir ⇒ Object

Returns the value of attribute cache_dir.



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# File 'lib/plumnailer/caching_fetcher.rb', line 29

def cache_dir
  @cache_dir
end

Instance Method Details

#fetch(url, orig_url = nil, redirect_count = 0) ⇒ Object

Fetch the contents of a url and cache result on filesystem.



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# File 'lib/plumnailer/caching_fetcher.rb', line 17

def fetch(url, orig_url=nil, redirect_count=0)
  cache_file = File.join(cache_dir, CGI.escape(url.to_s))

  if File.exists?(cache_file)
    open(cache_file) { |f| f.read }
  else
    data = super
    open(cache_file, 'w') { |f| f.write(data) }
    data
  end
end