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require "faraday/middleware"
module ZendeskAPI
module Middleware
module Request
# Request middleware that caches responses based on etags
# can be removed once this is merged: https://github.com/pengwynn/faraday_middleware/pull/42
# @private
class EtagCache < Faraday::Middleware
def initialize(app, options = {})
@app = app
@cache = options[:cache] ||
raise("need :cache option e.g. ActiveSupport::Cache::MemoryStore.new")
@cache_key_prefix = options.fetch(:cache_key_prefix, :faraday_etags)
end
def cache_key(env)
[@cache_key_prefix, env[:url].to_s]
end
def call(env)
return @app.call(env) unless [:get, :head].include?(env[:method])
# send known etag
cached = @cache.read(cache_key(env))
if cached
env[:request_headers]["If-None-Match"] ||= cached[:response_headers]["Etag"]
end
@app.call(env).on_complete do
if cached && env[:status] == 304 # not modified
env[:body] = cached[:body]
env[:response_headers].merge!(
:etag => cached[:response_headers][:etag],
:content_type => cached[:response_headers][:content_type],
:content_length => cached[:response_headers][:content_length],
:content_encoding => cached[:response_headers][:content_encoding]
)
elsif env[:status] == 200 && env[:response_headers]["Etag"] # modified and cacheable
@cache.write(cache_key(env), env)
end
end
end
end
end
end
end
Version data entries
29 entries across 29 versions & 1 rubygems