Class: OpenTelemetry::Instrumentation::Sinatra::Middlewares::TracerMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/opentelemetry/instrumentation/sinatra/middlewares/tracer_middleware.rb

Overview

Middleware to trace Sinatra requests

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ TracerMiddleware

Returns a new instance of TracerMiddleware.



13
14
15
 
# File 'lib/opentelemetry/instrumentation/sinatra/middlewares/tracer_middleware.rb', line 13

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/opentelemetry/instrumentation/sinatra/middlewares/tracer_middleware.rb', line 17

def call(env)
  extracted_context = OpenTelemetry.propagation.extract(
    env,
    getter: OpenTelemetry::Common::Propagation.rack_env_getter
  )
  OpenTelemetry::Context.with_current(extracted_context) do
    tracer.in_span(
      env['PATH_INFO'],
      attributes: { 'http.method' => env['REQUEST_METHOD'],
                    'http.url' => env['PATH_INFO'] },
      kind: :server
    ) do |span|
      @app.call(env).tap { |resp| trace_response(span, env, resp) }
    end
  end
end