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exporter.go
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/
exporter.go
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// Copyright The OpenTelemetry Authors
//
// 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:https://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 googlecloudpubsubexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/googlecloudpubsubexporter"
import (
"bytes"
"compress/gzip"
"context"
"fmt"
"time"
pubsub "cloud.google.com/go/pubsub/apiv1"
"github.com/google/uuid"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/pdata/plog"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.opentelemetry.io/collector/pdata/ptrace"
"go.uber.org/zap"
"google.golang.org/api/option"
pubsubpb "google.golang.org/genproto/googleapis/pubsub/v1"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
const name = "googlecloudpubsub"
type pubsubExporter struct {
logger *zap.Logger
client *pubsub.PublisherClient
cancel context.CancelFunc
userAgent string
ceSource string
ceCompression compression
config *Config
tracesMarshaler ptrace.Marshaler
tracesWatermarkFunc tracesWatermarkFunc
metricsMarshaler pmetric.Marshaler
metricsWatermarkFunc metricsWatermarkFunc
logsMarshaler plog.Marshaler
logsWatermarkFunc logsWatermarkFunc
}
func (*pubsubExporter) Name() string {
return name
}
type encoding int
const (
otlpProtoTrace encoding = iota
otlpProtoMetric = iota
otlpProtoLog = iota
)
type compression int
const (
uncompressed compression = iota
gZip = iota
)
type WatermarkBehavior int
const (
current WatermarkBehavior = iota
earliest = iota
)
func (ex *pubsubExporter) start(ctx context.Context, _ component.Host) error {
ctx, ex.cancel = context.WithCancel(ctx)
if ex.client == nil {
copts := ex.generateClientOptions()
client, err := pubsub.NewPublisherClient(ctx, copts...)
if err != nil {
return fmt.Errorf("failed creating the gRPC client to Pubsub: %w", err)
}
ex.client = client
}
return nil
}
func (ex *pubsubExporter) shutdown(context.Context) error {
if ex.client != nil {
ex.client.Close()
ex.client = nil
}
return nil
}
func (ex *pubsubExporter) generateClientOptions() (copts []option.ClientOption) {
if ex.userAgent != "" {
copts = append(copts, option.WithUserAgent(ex.userAgent))
}
if ex.config.endpoint != "" {
if ex.config.insecure {
var dialOpts []grpc.DialOption
if ex.userAgent != "" {
dialOpts = append(dialOpts, grpc.WithUserAgent(ex.userAgent))
}
conn, _ := grpc.Dial(ex.config.endpoint, append(dialOpts, grpc.WithTransportCredentials(insecure.NewCredentials()))...)
copts = append(copts, option.WithGRPCConn(conn))
} else {
copts = append(copts, option.WithEndpoint(ex.config.endpoint))
}
}
return copts
}
func (ex *pubsubExporter) publishMessage(ctx context.Context, encoding encoding, data []byte, watermark time.Time) error {
id, err := uuid.NewRandom()
if err != nil {
return err
}
ceTime, err := watermark.MarshalText()
if err != nil {
return err
}
attributes := map[string]string{
"ce-specversion": "1.0",
"ce-id": id.String(),
"ce-source": ex.ceSource,
"ce-time": string(ceTime),
}
switch encoding {
case otlpProtoTrace:
attributes["ce-type"] = "org.opentelemetry.otlp.traces.v1"
attributes["content-type"] = "application/protobuf"
case otlpProtoMetric:
attributes["ce-type"] = "org.opentelemetry.otlp.metrics.v1"
attributes["content-type"] = "application/protobuf"
case otlpProtoLog:
attributes["ce-type"] = "org.opentelemetry.otlp.logs.v1"
attributes["content-type"] = "application/protobuf"
}
switch ex.ceCompression {
case gZip:
attributes["content-encoding"] = "gzip"
data, err = ex.compress(data)
if err != nil {
return err
}
}
_, err = ex.client.Publish(ctx, &pubsubpb.PublishRequest{
Topic: ex.config.Topic,
Messages: []*pubsubpb.PubsubMessage{
{
Attributes: attributes,
Data: data,
},
},
})
return err
}
func (ex *pubsubExporter) compress(payload []byte) ([]byte, error) {
switch ex.ceCompression {
case gZip:
var buf bytes.Buffer
writer := gzip.NewWriter(&buf)
_, err := writer.Write(payload)
if err != nil {
return nil, err
}
err = writer.Close()
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
return payload, nil
}
func (ex *pubsubExporter) consumeTraces(ctx context.Context, traces ptrace.Traces) error {
buffer, err := ex.tracesMarshaler.MarshalTraces(traces)
if err != nil {
return err
}
return ex.publishMessage(ctx, otlpProtoTrace, buffer, ex.tracesWatermarkFunc(traces, time.Now(), ex.config.Watermark.AllowedDrift).UTC())
}
func (ex *pubsubExporter) consumeMetrics(ctx context.Context, metrics pmetric.Metrics) error {
buffer, err := ex.metricsMarshaler.MarshalMetrics(metrics)
if err != nil {
return err
}
return ex.publishMessage(ctx, otlpProtoMetric, buffer, ex.metricsWatermarkFunc(metrics, time.Now(), ex.config.Watermark.AllowedDrift).UTC())
}
func (ex *pubsubExporter) consumeLogs(ctx context.Context, logs plog.Logs) error {
buffer, err := ex.logsMarshaler.MarshalLogs(logs)
if err != nil {
return err
}
return ex.publishMessage(ctx, otlpProtoLog, buffer, ex.logsWatermarkFunc(logs, time.Now(), ex.config.Watermark.AllowedDrift).UTC())
}