Module: StackServiceBase

Defined in:
lib/stack-service-base.rb,
lib/stack-service-base/version.rb

Constant Summary collapse

VERSION = 
'0.0.77'

Class Method Summary collapse

Class Method Details

.pre_init ⇒ Object 



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# File 'lib/stack-service-base.rb', line 17

def pre_init()
  if defined? Sequel
    require 'stack-service-base/database'

    Sequel::Database.after_initialize { _1.loggers << LOGGER }

    attempts= 10
    sleep_interval= 1

    mod = Module.new do
      define_method(:connect) do |*args, **opts, &blk|
        tries = attempts
        begin
          super(*args, **opts, &blk)
        rescue Sequel::DatabaseConnectionError, Sequel::DatabaseError => e
          if (tries -= 1) > 0
            LOGGER.warn "DB connect failed (#{e.message}), retrying in #{sleep_interval}s… (#{tries} left)"
            sleep sleep_interval
            retry
          end
          raise
        end
      end
    end

    Sequel.singleton_class.prepend(mod)

    require 'sequel/adapters/postgres'
    PG::Connection.singleton_class.prepend(Module.new{
      def connect_to_hosts(*args)
        stack_name = ENV['STACK_NAME'] || 'undefined_stack'
        service_name = ENV['STACK_SERVICE_NAME'] || 'undefined_service'
        args[0][:fallback_application_name] ||= "#{stack_name}_#{service_name}"
        super *args
      end
    })

    require_relative 'stack-service-base/fiber_pool'
  end
  @pre_init = :done
end

.rack_setup(app) ⇒ Object 



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# File 'lib/stack-service-base.rb', line 59

def rack_setup app
  # skip if called within Rspec task
  # TODO: warn if called not within Rspec task but with a wrong app class
  return unless app.respond_to? :use

  app.instance_eval do
    if OTEL_ENABLED
      otel_initialize
    end

    if NATS_ENABLED
      initialize_nats_service
    end

    RackHelpers.rack_setup app

    if ENV.fetch('PROMETHEUS_METRICS_EXPORT', 'true') == 'true'
      require 'stack-service-base/prometheus'

      # use Rack::Deflater
      use Prometheus::Middleware::Collector
      use Prometheus::Middleware::Exporter
    end

    # Sinatra?
    # disable :show_exceptions unless ENV['DEBUG']
    # error do
    #   status 500
    #   $stderr.puts "Exception: #{env['sinatra.error']}"
    #   $stderr.puts "Exception backtrace: #{env['sinatra.error'].backtrace[0..10].join("\n")}"
    #   { error: "Internal server error", message: env['sinatra.error'].message }.to_json
    # end
    StackServiceBase.pre_init unless @pre_init == :done
  end
end