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provide.go
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provide.go
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package kubernetes
import (
"context"
"go.uber.org/fx"
"github.com/fluxninja/aperture/pkg/config"
"github.com/fluxninja/aperture/pkg/discovery/entities"
kubernetesconfig "github.com/fluxninja/aperture/pkg/discovery/kubernetes/config"
"github.com/fluxninja/aperture/pkg/k8s"
"github.com/fluxninja/aperture/pkg/log"
"github.com/fluxninja/aperture/pkg/status"
)
// Module returns an fx.Option that provides the Kubernetes discovery module.
func Module() fx.Option {
return fx.Options(
fx.Invoke(InvokeServiceDiscovery),
)
}
// FxInSvc describes parameters passed to k8s discovery constructor.
type FxInSvc struct {
fx.In
Unmarshaller config.Unmarshaller
Lifecycle fx.Lifecycle
StatusRegistry status.Registry
KubernetesClient k8s.K8sClient
EntityTrackers *entities.EntityTrackers
}
// InvokeServiceDiscovery creates a Kubernetes service discovery.
func InvokeServiceDiscovery(in FxInSvc) error {
var cfg kubernetesconfig.KubernetesDiscoveryConfig
if err := in.Unmarshaller.UnmarshalKey(kubernetesconfig.Key, &cfg); err != nil {
log.Error().Err(err).Msg("Unable to deserialize K8S discovery configuration!")
return err
}
if !cfg.Enabled {
log.Info().Msg("Skipping Kubernetes discovery since it is disabled")
return nil
}
if in.KubernetesClient == nil {
// No error, but Genuinely nil, example not in Kubernetes cluster
log.Info().Msg("Kubernetes client is nil, skipping Kubernetes discovery")
return nil
}
entityEvents := in.EntityTrackers.RegisterServiceDiscovery(podTrackerPrefix)
ksd, err := newServiceDiscovery(entityEvents, in.KubernetesClient)
if err != nil {
log.Info().Err(err).Msg("Failed to create Kubernetes service discovery")
return err
}
in.Lifecycle.Append(fx.Hook{
OnStart: func(ctx context.Context) error {
return ksd.start(ctx)
},
OnStop: func(ctx context.Context) error {
return ksd.stop(ctx)
},
})
return nil
}