mirror of
https://github.com/codeninjasllc/discourse.git
synced 2024-11-24 16:18:42 -05:00
3d647a4b41
instead implement an aggressive anonymous cache that is stored in redis this cache is sitting in the front of the middleware stack enabled only in production TODO: expire it more intelligently when stuff is created
92 lines
2.1 KiB
Ruby
92 lines
2.1 KiB
Ruby
module Middleware
|
|
class AnonymousCache
|
|
|
|
def self.anon_cache(env, duration)
|
|
env["ANON_CACHE_DURATION"] = duration
|
|
end
|
|
|
|
class Helper
|
|
def initialize(env)
|
|
@env = env
|
|
end
|
|
|
|
def cache_key
|
|
@cache_key ||= "ANON_CACHE_#{@env["HTTP_HOST"]}#{@env["REQUEST_URI"]}"
|
|
end
|
|
|
|
def cache_key_body
|
|
@cache_key_body ||= "#{cache_key}_body"
|
|
end
|
|
|
|
def cache_key_other
|
|
@cache_key_other || "#{cache_key}_other"
|
|
end
|
|
|
|
def get?
|
|
@env["REQUEST_METHOD"] == "GET"
|
|
end
|
|
|
|
def cacheable?
|
|
!!(!CurrentUser.has_auth_cookie?(@env) && get?)
|
|
end
|
|
|
|
def cached
|
|
if body = $redis.get(cache_key_body)
|
|
if other = $redis.get(cache_key_other)
|
|
other = JSON.parse(other)
|
|
[other[0], other[1], [body]]
|
|
end
|
|
end
|
|
end
|
|
|
|
def cache_duration
|
|
@env["ANON_CACHE_DURATION"]
|
|
end
|
|
|
|
# NOTE in an ideal world cache still serves out cached content except for one magic worker
|
|
# that fills it up, this avoids a herd killing you, we can probably do this using a job or redis tricks
|
|
# but coordinating this is tricky
|
|
def cache(result)
|
|
status,headers,response = result
|
|
|
|
if status == 200 && cache_duration
|
|
headers_stripped = headers.dup.delete_if{|k,v| ["Set-Cookie","X-MiniProfiler-Ids"].include? k}
|
|
parts = []
|
|
response.each do |part|
|
|
parts << part
|
|
end
|
|
|
|
$redis.setex(cache_key_body, cache_duration, parts.join)
|
|
$redis.setex(cache_key_other, cache_duration, [status,headers_stripped].to_json)
|
|
else
|
|
parts = response
|
|
end
|
|
|
|
[status,headers,parts]
|
|
end
|
|
|
|
def clear_cache
|
|
$redis.del(cache_key_body)
|
|
$redis.del(cache_key_other)
|
|
end
|
|
|
|
end
|
|
|
|
def initialize(app, settings={})
|
|
@app = app
|
|
end
|
|
|
|
def call(env)
|
|
helper = Helper.new(env)
|
|
|
|
if helper.cacheable?
|
|
helper.cached or helper.cache(@app.call(env))
|
|
else
|
|
@app.call(env)
|
|
end
|
|
|
|
end
|
|
|
|
end
|
|
|
|
end
|