class OpenTelemetry::Adapters::Sinatra::Middlewares::TracerMiddleware

Middleware to trace Sinatra requests

Attributes

app[R]

Public Class Methods

new(app) click to toggle source
# File lib/opentelemetry/adapters/sinatra/middlewares/tracer_middleware.rb, line 13
def initialize(app)
  @app = app
end

Public Instance Methods

call(env) click to toggle source
# File lib/opentelemetry/adapters/sinatra/middlewares/tracer_middleware.rb, line 17
def call(env)
  tracer.in_span(
    env['PATH_INFO'],
    attributes: { 'http.method' => env['REQUEST_METHOD'],
                  'http.url' => env['PATH_INFO'] },
    kind: :server,
    with_parent_context: parent_context(env)
  ) do |span|
    app.call(env).tap { |resp| trace_response(span, env, resp) }
  end
end

Private Instance Methods

parent_context(env) click to toggle source
# File lib/opentelemetry/adapters/sinatra/middlewares/tracer_middleware.rb, line 33
def parent_context(env)
  OpenTelemetry.propagation.http.extract(env)
end
trace_response(span, env, resp) click to toggle source
# File lib/opentelemetry/adapters/sinatra/middlewares/tracer_middleware.rb, line 41
def trace_response(span, env, resp)
  status, _headers, _response_body = resp

  span.set_attribute('http.status_code', status)
  span.set_attribute('http.status_text', ::Rack::Utils::HTTP_STATUS_CODES[status])
  span.set_attribute('http.route', env['sinatra.route'].split.last) if env['sinatra.route']
  span.status = OpenTelemetry::Trace::Status.http_to_status(status)
end
tracer() click to toggle source
# File lib/opentelemetry/adapters/sinatra/middlewares/tracer_middleware.rb, line 37
def tracer
  OpenTelemetry::Adapters::Sinatra::Adapter.instance.tracer
end