gitlab-org--gitlab-foss/lib/gitlab/testing/request_blocker_middleware.rb
2018-01-11 16:34:01 +00:00

75 lines
1.8 KiB
Ruby

# rubocop:disable Style/ClassVars
# This is inspired by http://www.salsify.com/blog/engineering/tearing-capybara-ajax-tests
# Rack middleware that keeps track of the number of active requests and can block new requests.
module Gitlab
module Testing
class RequestBlockerMiddleware
@@num_active_requests = Concurrent::AtomicFixnum.new(0)
@@block_requests = Concurrent::AtomicBoolean.new(false)
@@slow_requests = Concurrent::AtomicBoolean.new(false)
# Returns the number of requests the server is currently processing.
def self.num_active_requests
@@num_active_requests.value
end
# Prevents the server from accepting new requests. Any new requests will return an HTTP
# 503 status.
def self.block_requests!
@@block_requests.value = true
end
# Slows down incoming requests (useful for race conditions).
def self.slow_requests!
@@slow_requests.value = true
end
# Allows the server to accept requests again.
def self.allow_requests!
@@block_requests.value = false
@@slow_requests.value = false
end
def initialize(app)
@app = app
end
def call(env)
increment_active_requests
if block_requests?
block_request(env)
else
sleep 0.2 if slow_requests?
@app.call(env)
end
ensure
decrement_active_requests
end
private
def block_requests?
@@block_requests.true?
end
def slow_requests?
@@slow_requests.true?
end
def block_request(env)
[503, {}, []]
end
def increment_active_requests
@@num_active_requests.increment
end
def decrement_active_requests
@@num_active_requests.decrement
end
end
end
end