class Her::Middleware::CacheUnmodified
Easy way to begin support 304 status, so on ther side if data was not changed You will load it from local cache. Of course, other side must support Of course, other side must support 304 status also. Here is Rails controller example with this support:
class Post < ApplicationController
before_action :check_changes private def check_changes return unless request.headers['HTTP_IF_MODIFIED_SINCE'] return if request.headers['HTTP_IF_MODIFIED_SINCE'].to_datetime > resource.updated_at render body: nil, status: 304 end
end
Constants
- SAVE_METHODS
Attributes
cache[R]
options[R]
url[RW]
Public Class Methods
new(app, options={})
click to toggle source
apply with optinos: cache # default value is Rails.cache if Rails is used cache_key_prefix # defauilt is nil
# File lib/her_cache_unmodified.rb, line 27 def initialize(app, options={}) @app = app @cache = options[:cache] @cache ||= Rails.cache if defined?(Rails) @options = options end
Public Instance Methods
call(env)
click to toggle source
# File lib/her_cache_unmodified.rb, line 34 def call(env) return @app.call(env) unless SAVE_METHODS.include?(env[:method]) self.url = env.url.to_s env[:request_headers]["If-Modified-Since"] ||= cached_time if cached_time @app.call(env).on_complete do if env[:status] == 304 if cached_body env[:body] = cached_body # with out this hack Her crushes env[:status] = 200 end elsif env[:status] == 200 cache.write cache_key_body, env[:body], expires_in: cache_key_ttl cache.write cache_key_time, Time.zone.now.httpdate, expires_in: cache_key_ttl end end end
Private Instance Methods
cache_key_body()
click to toggle source
# File lib/her_cache_unmodified.rb, line 59 def cache_key_body [options[:cache_key_prefix], "body", url].compact.join("/") end
cache_key_time()
click to toggle source
# File lib/her_cache_unmodified.rb, line 55 def cache_key_time [options[:cache_key_prefix], "time", url].compact.join("/") end
cache_key_ttl()
click to toggle source
# File lib/her_cache_unmodified.rb, line 71 def cache_key_ttl 1.week.freeze end
cached_body()
click to toggle source
# File lib/her_cache_unmodified.rb, line 67 def cached_body cache.read(cache_key_body) end
cached_time()
click to toggle source
# File lib/her_cache_unmodified.rb, line 63 def cached_time cache.read(cache_key_time) end