Class: Upfluence::HTTP::Middleware::Prometheus

Inherits:
Object
  • Object
show all
Defined in:
lib/upfluence/http/middleware/prometheus.rb

Constant Summary collapse

LABELS = 
%i[path method env].freeze

Instance Method Summary collapse

Constructor Details

#initialize(app, registry = ::Prometheus::Client.registry) ⇒ Prometheus

Returns a new instance of Prometheus.



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# File 'lib/upfluence/http/middleware/prometheus.rb', line 10

def initialize(app, registry = ::Prometheus::Client.registry)
  @registry = registry

  @request_total_count = @registry.get(
    :uhttp_handler_requests_total
  ) || @registry.counter(
    :uhttp_handler_requests_total,
    docstring: 'Histogram of processed items',
    labels:    LABELS + %i[status]
  )

  @request_histogram = @registry.get(
    :uhttp_handler_requests_duration_second
  ) || @registry.histogram(
    :uhttp_handler_requests_duration_second,
    docstring: 'Histogram of processing time',
    labels:    LABELS
  )

  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/upfluence/http/middleware/prometheus.rb', line 32

def call(env)
  trace(env) { @app.call(env) }
end