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# frozen_string_literal: true
require 'thread'
require 'rack/body_proxy'
module Rack
# Rack::Lock locks every request inside a mutex, so that every request
# will effectively be executed synchronously.
class Lock
def initialize(app, mutex = Mutex.new)
@app, @mutex = app, mutex
end
def call(env)
@mutex.lock
@env = env
@old_rack_multithread = env[RACK_MULTITHREAD]
begin
response = @app.call(env.merge!(RACK_MULTITHREAD => false))
returned = response << BodyProxy.new(response.pop) { unlock }
ensure
unlock unless returned
end
end
private
def unlock
@mutex.unlock
@env[RACK_MULTITHREAD] = @old_rack_multithread
end
end
end
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