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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
FLAG = 'rack.multithread'.freeze
def initialize(app, mutex = Mutex.new)
@app, @mutex = app, mutex
end
def call(env)
old, env[FLAG] = env[FLAG], false
@mutex.lock
response = @app.call(env)
body = BodyProxy.new(response[2]) { @mutex.unlock }
response[2] = body
response
ensure
@mutex.unlock unless body
env[FLAG] = old
end
end
end
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