Class: Salopulse::Instrumentation::RackMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/salopulse/instrumentation/rack_middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, client = Salopulse::Client.instance) ⇒ RackMiddleware

Returns a new instance of RackMiddleware.



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# File 'lib/salopulse/instrumentation/rack_middleware.rb', line 7

def initialize(app, client = Salopulse::Client.instance)
  @app = app
  @client = client
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/salopulse/instrumentation/rack_middleware.rb', line 12

def call(env)
  return @app.call(env) if @client.disabled?

  endpoint = derive_endpoint(env)
  http_method = env["REQUEST_METHOD"]
  Salopulse::RequestContext.start(endpoint: endpoint, http_method: http_method)

  status = 500
  begin
    status, headers, body = @app.call(env)
    [status, headers, body]
  rescue Exception => e # rubocop:disable Lint/RescueException
    @client.capture_exception(e, environment_data: env_snapshot(env))
    raise
  ensure
    begin
      @client.capture_performance(
        endpoint: endpoint,
        http_method: http_method,
        duration_ms: Salopulse::RequestContext.elapsed_ms,
        status_code: status
      )
      @client.flush_request_scope_events
    rescue StandardError
      # never let SDK errors propagate
    end
    Salopulse::RequestContext.clear
  end
end