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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
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class AnonymousCache
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def self.anon_cache(env, duration)
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env["ANON_CACHE_DURATION"] = duration
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end
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class Helper
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def initialize(env)
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@env = env
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end
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def cache_key
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@cache_key ||= "ANON_CACHE_#{@env["HTTP_HOST"]}#{@env["REQUEST_URI"]}"
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end
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def cache_key_body
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@cache_key_body ||= "#{cache_key}_body"
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end
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def cache_key_other
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@cache_key_other || "#{cache_key}_other"
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end
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def get?
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@env["REQUEST_METHOD"] == "GET"
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end
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def cacheable?
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!!(!CurrentUser.has_auth_cookie?(@env) && get?)
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end
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def cached
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if body = $redis.get(cache_key_body)
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if other = $redis.get(cache_key_other)
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other = JSON.parse(other)
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[other[0], other[1], [body]]
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end
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end
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end
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def cache_duration
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@env["ANON_CACHE_DURATION"]
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end
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# NOTE in an ideal world cache still serves out cached content except for one magic worker
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# that fills it up, this avoids a herd killing you, we can probably do this using a job or redis tricks
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# but coordinating this is tricky
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def cache(result)
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status,headers,response = result
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if status == 200 && cache_duration
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headers_stripped = headers.dup.delete_if{|k,v| ["Set-Cookie","X-MiniProfiler-Ids"].include? k}
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parts = []
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response.each do |part|
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parts << part
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end
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$redis.setex(cache_key_body, cache_duration, parts.join)
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$redis.setex(cache_key_other, cache_duration, [status,headers_stripped].to_json)
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else
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parts = response
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end
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[status,headers,parts]
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end
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def clear_cache
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$redis.del(cache_key_body)
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$redis.del(cache_key_other)
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end
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end
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def initialize(app, settings={})
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@app = app
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end
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def call(env)
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helper = Helper.new(env)
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if helper.cacheable?
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helper.cached or helper.cache(@app.call(env))
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else
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@app.call(env)
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end
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end
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end
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end
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