/
observers.go
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/
observers.go
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// Copyright 2017 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package apiserver
import (
"github.com/juju/clock"
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/juju/pubsub/v2"
"github.com/juju/juju/agent"
"github.com/juju/juju/apiserver"
"github.com/juju/juju/apiserver/observer"
"github.com/juju/juju/apiserver/observer/metricobserver"
"github.com/juju/juju/controller"
)
func newObserverFn(
agentConfig agent.Config,
controllerConfig controller.Config,
clock clock.Clock,
hub *pubsub.StructuredHub,
metricsCollector *apiserver.Collector,
) (observer.ObserverFactory, error) {
var observerFactories []observer.ObserverFactory
// Common logging of RPC requests
observerFactories = append(observerFactories, func() observer.Observer {
logger := loggo.GetLogger("juju.apiserver")
ctx := observer.RequestObserverContext{
Clock: clock,
Logger: logger,
Hub: hub,
}
return observer.NewRequestObserver(ctx)
})
// Metrics observer.
metricObserver, err := metricobserver.NewObserverFactory(metricobserver.Config{
Clock: clock,
MetricsCollector: metricCollectorWrapper{collector: metricsCollector},
})
if err != nil {
return nil, errors.Annotate(err, "creating metric observer factory")
}
observerFactories = append(observerFactories, metricObserver)
return observer.ObserverFactoryMultiplexer(observerFactories...), nil
}
type metricCollectorWrapper struct {
collector *apiserver.Collector
}
func (o metricCollectorWrapper) APIRequestDuration() metricobserver.SummaryVec {
return o.collector.APIRequestDuration
}