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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 enabled?
settings.enabled
end
def settings
raise NotImplementedError
end
def log_filename
raise NotImplementedError
end
private
def start_working
logger = WEBrick::Log.new(log_filename)
logger.time_format = "[%Y-%m-%dT%H:%M:%S.%L%z]"
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_proc '/readiness' do |req, res|
render_probe(readiness_probe, req, res)
end
server.mount_proc '/liveness' do |req, res|
render_probe(liveness_probe, req, res)
end
server.mount '/', Rack::Handler::WEBrick, rack_app
true
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
Rack::Builder.app do
use Rack::Deflater
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
def render_probe(probe, req, res)
result = probe.execute
res.status = result.http_status
res.content_type = 'application/json; charset=utf-8'
res.body = result.json.to_json
end
end
end
end
end
|
