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default.go
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default.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package events
import (
"context"
"go.thethings.network/lorawan-stack/v3/pkg/ttnpb"
)
type noopPubSub struct{}
func (noopPubSub) Publish(...Event) {}
func (noopPubSub) Subscribe(context.Context, []string, []*ttnpb.EntityIdentifiers, Handler) error {
return nil
}
var defaultPubSub PubSub = &noopPubSub{}
// SetDefaultPubSub sets pubsub used by the package to ps.
func SetDefaultPubSub(ps PubSub) {
defaultPubSub = ps
}
// DefaultPubSub returns the default PubSub.
func DefaultPubSub() PubSub {
return defaultPubSub
}
// Subscribe subscribes on the default PubSub.
func Subscribe(ctx context.Context, names []string, ids []*ttnpb.EntityIdentifiers, hdl Handler) error {
return defaultPubSub.Subscribe(ctx, names, ids, hdl)
}
// Publish emits events on the default event pubsub.
func Publish(evs ...Event) {
if len(evs) == 0 {
return
}
evs = append(evs[:0:0], evs...)
for i, evt := range evs {
evs[i] = local(evt).withCaller()
publishes.WithLabelValues(evt.Name()).Inc()
}
defaultPubSub.Publish(evs...)
}