class ScoutApm::Middleware

Constants

MAX_ATTEMPTS

Public Class Methods

new(app) click to toggle source
# File lib/scout_apm/middleware.rb, line 5
def initialize(app)
  @app = app
  @attempts = 0
  # @enabled = ScoutApm::Agent.instance.context.apm_enabled?
  # XXX: Figure out if this middleware should even know
  @enabled = true
  @started = ScoutApm::Agent.instance.context.started? && ScoutApm::Agent.instance.background_worker_running?
end

Public Instance Methods

attempt_to_start_agent() click to toggle source
# File lib/scout_apm/middleware.rb, line 24
def attempt_to_start_agent
  @attempts += 1
  ScoutApm::Agent.instance.start
  @started = ScoutApm::Agent.instance.context.started? && ScoutApm::Agent.instance.background_worker_running?
rescue => e
  ScoutApm::Agent.instance.context.logger.info("Failed to start via Middleware: #{e.message}\n\t#{e.backtrace.join("\n\t")}")
end
call(env) click to toggle source

If we get a web request in, then we know we're running in some sort of app server

# File lib/scout_apm/middleware.rb, line 15
def call(env)
  if !@enabled || @started || @attempts > MAX_ATTEMPTS
    @app.call(env)
  else
    attempt_to_start_agent
    @app.call(env)
  end
end