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cloud_pubsub_sink.go
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cloud_pubsub_sink.go
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// Copyright 2023 Google LLC
//
// 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 sinks
import (
"context"
"fmt"
"log"
"time"
"cloud.google.com/go/pubsub"
api "github.com/p2004a/gbcsdpd/api"
"github.com/p2004a/gbcsdpd/pkg/config"
"google.golang.org/api/option"
"google.golang.org/protobuf/proto"
)
// CloudPubSubSink publishes measurements to Google Cloud Pub/Sub.
type CloudPubSubSink struct {
config *config.CloudPubSubSink
client *pubsub.Client
topic *pubsub.Topic
rl *rateLimiter
}
// Publish is used to push measurement for publication.
func (s *CloudPubSubSink) Publish(m *api.Measurement) {
s.rl.Publish(m)
}
func (s *CloudPubSubSink) groupPublish(ms []*api.Measurement) {
ctx, cancel := context.WithTimeout(context.Background(), 40*time.Second)
defer cancel()
pub := &api.MeasurementsPublication{Measurements: ms}
serPub, err := proto.Marshal(pub)
if err != nil {
log.Fatalf("Failed to binary encode measurement: %v", err)
}
// The attributes are named for compatibility with the IoT Core way of publishing.
_, err = s.topic.Publish(context.Background(), &pubsub.Message{
Data: serPub,
Attributes: map[string]string{
"deviceId": s.config.Device,
"deviceRegistryLocation": "global",
"projectId": s.client.Project(),
"subFolder": "v1",
},
}).Get(ctx)
if err != nil {
log.Printf("Failed to publish measurement: %v", err)
}
}
// NewCloudPubSubSink creates new CloudPubSubSink.
func NewCloudPubSubSink(config *config.CloudPubSubSink) (*CloudPubSubSink, error) {
ctx := context.Background()
client, err := pubsub.NewClient(ctx, config.Project, option.WithCredentials(config.Creds))
if err != nil {
return nil, fmt.Errorf("failed to create pubsub client: %v", err)
}
topic := client.Topic(config.Topic)
topic.PublishSettings.Timeout = 30 * time.Second
s := &CloudPubSubSink{
config: config,
topic: topic,
client: client,
}
s.rl = newRateLimiter(config.RateLimit, s.groupPublish)
return s, nil
}