Module: Sinatra::Cache::Helpers

Defined in:
lib/nesta/cache.rb

Instance Method Summary collapse

Instance Method Details

#cache(content, opts = {}) ⇒ Object

Caches the given URI to a html file in /public

Usage:

>> cache( erb(:contact, :layout => :layout))
  =>  returns the HTML output written to /public/<CACHE_DIR_PATH>/contact.html

Also accepts an Options Hash, with the following options:

* :extension => in case you need to change the file extension

TODO:: implement the opts={} hash functionality. What other options are needed?



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# File 'lib/nesta/cache.rb', line 29

def cache(content, opts={})
  return content unless options.cache_enabled
  
  unless content.nil?
    content = "#{content}\n#{page_cached_timestamp}\n"
    path = cache_page_path(request.path_info,opts)
    FileUtils.makedirs(File.dirname(path))
    open(path, 'wb+') { |f| f << content }
    log("Cached Page: [#{path}]",:info) 
    content
  end
end

#cache_expire(path = nil, opts = {}) ⇒ Object

Expires the cached URI (as .html file) in /public

Usage:

  >> cache_expire('/contact')
    =>  deletes the /public/<CACHE_DIR_PATH>contact.html page

  get '/contact' do 
   cache_expire   # deletes the /public/<CACHE_DIR_PATH>contact.html page as well
  end

TODO:: implement the options={} hash functionality. What options are really needed ?



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# File 'lib/nesta/cache.rb', line 53

def cache_expire(path = nil, opts={})
  return unless options.cache_enabled
  
  path = (path.nil?) ? cache_page_path(request.path_info) : cache_page_path(path)
  if File.exist?(path)
    File.delete(path)
    log("Expired Page deleted at: [#{path}]",:info)
  else
    log("No Expired Page was found at the path: [#{path}]",:info)
  end
end

#page_cached_timestamp ⇒ Object

Prints a basic HTML comment with a timestamp in it, so that you can see when a file was cached last.

NB! IE6 does NOT like this to be the first line of a HTML document, so output inside the <head> tag. Many hours wasted on that lesson ;-)

Usage:

>> <%= page_cached_timestamp %>
  => <!--  page cached: 2009-02-24 12:00:00 -->



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# File 'lib/nesta/cache.rb', line 74

def page_cached_timestamp
  "<!-- page cached: #{Time.now.strftime("%Y-%d-%m %H:%M:%S")} -->\n" if options.cache_enabled
end