Class: Ey::Core::ResponseCache

Inherits:
Object
  • Object
show all
Defined in:
lib/ey-core/response_cache.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}, &block) ⇒ ResponseCache

Returns a new instance of ResponseCache.



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# File 'lib/ey-core/response_cache.rb', line 2

def initialize(app, options = {}, &block)
  @app = app
  @cache = options.fetch(:cache, &block)
  @cache_key_prefix = options.fetch(:cache_key_prefix, :ey_core)
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/ey-core/response_cache.rb', line 8

def call(env)
  # Only cache "safe" requests
  return @app.call(env) unless [:get, :head].include?(env[:method])

  cache_key = [ @cache_key_prefix, env[:url].to_s ]
  cached = @cache.read(cache_key)

  if cached
    env[:request_headers]["If-None-Match"] ||= cached[:response_headers]["Etag"]
  end

  @app.call(env).on_complete do
    if cached && env[:status] == 304
      env[:body] = cached[:body]
    end

    if !cached && env[:response_headers]["Etag"]
      @cache.write(cache_key, env)
    end
  end
end