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subscription.go
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subscription.go
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// Copyright © 2021 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 basic
import (
"context"
"go.thethings.network/lorawan-stack/v3/pkg/events"
"go.thethings.network/lorawan-stack/v3/pkg/ttnpb"
"go.thethings.network/lorawan-stack/v3/pkg/unique"
)
// Subscription is a basic implementation of a PubSub subscription.
type Subscription struct {
ctx context.Context
names []string
identifiers []*ttnpb.EntityIdentifiers
handler events.Handler
}
// NewSubscription creates a new basic PubSub subscription.
func NewSubscription(ctx context.Context, names []string, identifiers []*ttnpb.EntityIdentifiers, hdl events.Handler) (*Subscription, error) {
s := &Subscription{
ctx: ctx,
names: names,
identifiers: identifiers,
handler: hdl,
}
return s, nil
}
func (s *Subscription) matchName(evt events.Event) bool {
if len(s.names) == 0 {
return true
}
for _, subName := range s.names {
if subName == evt.Name() {
return true
}
}
return false
}
func (s *Subscription) matchIdentifiers(evt events.Event) bool {
if len(s.identifiers) == 0 {
return true
}
for _, evtIDs := range evt.Identifiers() {
evtEntityType := evtIDs.EntityType()
for _, subIDs := range s.identifiers {
subEntityType, subUID := subIDs.EntityType(), unique.ID(s.ctx, subIDs)
if evtEntityType == subEntityType && unique.ID(evt.Context(), evtIDs) == subUID {
return true
}
if evtEntityType == "end device" && subEntityType == "application" &&
unique.ID(evt.Context(), evtIDs.GetDeviceIds().ApplicationIdentifiers) == unique.ID(s.ctx, subIDs) {
return true
}
}
}
return false
}
// Match returns whether the event matches the subscription.
func (s *Subscription) Match(evt events.Event) bool {
if s == nil {
return false
}
return s.matchName(evt) && s.matchIdentifiers(evt)
}
// Notify notifies the subscription of a new matching event.
func (s *Subscription) Notify(evt events.Event) {
if s == nil {
return
}
s.handler.Notify(evt)
}