50 lines
1.6 KiB
Ruby
50 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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# This middleware provides a health check that does not hit the database. Its purpose
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# is to notify the prober that the application server is handling requests, but a 200
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# response does not signify that the database or other services are ready.
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#
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# See https://thisdata.com/blog/making-a-rails-health-check-that-doesnt-hit-the-database/ for
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# more details.
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module Gitlab
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module Middleware
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class BasicHealthCheck
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# This can't be frozen because Rails::Rack::Logger wraps the body
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# rubocop:disable Style/MutableConstant
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OK_RESPONSE = [200, { 'Content-Type' => 'text/plain' }, ["GitLab OK"]]
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EMPTY_RESPONSE = [404, { 'Content-Type' => 'text/plain' }, [""]]
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# rubocop:enable Style/MutableConstant
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HEALTH_PATH = '/-/health'
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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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return @app.call(env) unless env['PATH_INFO'] == HEALTH_PATH
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# We should be using ActionDispatch::Request instead of
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# Rack::Request to be consistent with Rails, but due to a Rails
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# bug described in
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# https://gitlab.com/gitlab-org/gitlab-foss/issues/58573#note_149799010
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# hosts behind a load balancer will only see 127.0.0.1 for the
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# load balancer's IP.
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request = Rack::Request.new(env)
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return OK_RESPONSE if client_ip_whitelisted?(request)
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EMPTY_RESPONSE
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end
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def client_ip_whitelisted?(request)
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ip_whitelist.any? { |e| e.include?(request.ip) }
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end
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def ip_whitelist
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@ip_whitelist ||= Settings.monitoring.ip_whitelist.map(&IPAddr.method(:new))
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end
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end
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end
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end
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