100 lines
2.8 KiB
Ruby
100 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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require 'webrick'
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require 'prometheus/client/rack/exporter'
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module Gitlab
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module Metrics
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module Exporter
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class BaseExporter < Daemon
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attr_reader :server
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# @param settings [Hash] SettingsLogic hash containing the `*_exporter` config
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# @param log_enabled [Boolean] whether to log HTTP requests
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# @param log_file [String] path to where the server log should be located
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# @param gc_requests [Boolean] whether to run a major GC after each scraper request
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def initialize(settings, log_enabled:, log_file:, gc_requests: false, **options)
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super(**options)
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@settings = settings
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@gc_requests = gc_requests
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# log_enabled does not exist for all exporters
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log_sink = log_enabled ? File.join(Rails.root, 'log', log_file) : File::NULL
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@logger = WEBrick::Log.new(log_sink)
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@logger.time_format = "[%Y-%m-%dT%H:%M:%S.%L%z]"
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end
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def enabled?
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settings.enabled
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end
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private
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attr_reader :settings, :logger
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def start_working
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access_log = [
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[logger, WEBrick::AccessLog::COMBINED_LOG_FORMAT]
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]
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@server = ::WEBrick::HTTPServer.new(
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Port: settings.port, BindAddress: settings.address,
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Logger: logger, AccessLog: access_log
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)
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server.mount '/', Rack::Handler::WEBrick, rack_app
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true
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rescue StandardError => e
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logger.error(e)
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false
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end
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def run_thread
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server&.start
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rescue IOError
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# ignore forcibily closed servers
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end
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def stop_working
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if server
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# we close sockets if thread is not longer running
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# this happens, when the process forks
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if thread.alive?
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server.shutdown
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else
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server.listeners.each(&:close)
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end
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end
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@server = nil
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end
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def rack_app
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readiness = readiness_probe
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liveness = liveness_probe
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pid = thread_name
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gc_requests = @gc_requests
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Rack::Builder.app do
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use Rack::Deflater
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use Gitlab::Metrics::Exporter::MetricsMiddleware, pid
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use Gitlab::Metrics::Exporter::HealthChecksMiddleware, readiness, liveness
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use Gitlab::Metrics::Exporter::GcRequestMiddleware if gc_requests
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use ::Prometheus::Client::Rack::Exporter if ::Gitlab::Metrics.metrics_folder_present?
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run -> (env) { [404, {}, ['']] }
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end
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end
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def readiness_probe
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::Gitlab::HealthChecks::Probes::Collection.new
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end
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def liveness_probe
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::Gitlab::HealthChecks::Probes::Collection.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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end
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