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https://github.com/openfoodfoundation/openfoodnetwork
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77 lines
1.8 KiB
Ruby
77 lines
1.8 KiB
Ruby
# Copied from http://blog.salsify.com/engineering/tearing-capybara-ajax-tests
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# https://gist.github.com/jturkel/9317269/raw/ff7838684370fd8a468ffe1e5ce1f3e46ba39951/rack_request_blocker.rb
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require 'atomic'
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# Rack middleware that keeps track of the number of active requests and can block new requests.
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class RackRequestBlocker
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@@num_active_requests = Atomic.new(0)
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@@block_requests = Atomic.new(false)
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# Returns the number of requests the server is currently processing.
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def self.num_active_requests
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@@num_active_requests.value
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end
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# Prevents the server from accepting new requests. Any new requests will return an HTTP
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# 503 status.
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def self.block_requests!
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@@block_requests.value = true
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end
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# Allows the server to accept requests again.
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def self.allow_requests!
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@@block_requests.value = false
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end
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def initialize(app)
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@app = app
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end
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def call(env)
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increment_active_requests
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if block_requests?
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block_request(env)
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else
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@app.call(env)
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end
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ensure
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decrement_active_requests
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end
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def self.wait_for_requests_complete
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block_requests!
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max_wait_time = 30
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polling_interval = 0.01
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wait_until = Time.now.in_time_zone + max_wait_time.seconds
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loop do
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return if num_active_requests == 0
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if Time.now.in_time_zone > wait_until
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raise "Failed waiting for completing requests, #{num_active_requests} running."
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else
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sleep(polling_interval)
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end
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end
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ensure
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allow_requests!
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end
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private
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def block_requests?
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@@block_requests.value
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end
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def block_request(_env)
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[503, {}, []]
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end
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def increment_active_requests
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@@num_active_requests.update { |v| v + 1 }
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end
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def decrement_active_requests
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@@num_active_requests.update { |v| v - 1 }
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end
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end
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