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