forked from open-telemetry/opentelemetry-collector-contrib
/
pulsar_exporter.go
106 lines (91 loc) · 2.93 KB
/
pulsar_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://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 pulsarexporter // import "github.com/sparam/opentelemetry-collector-contrib/exporter/pulsarexporter"
import (
"context"
"fmt"
"log"
"time"
"github.com/apache/pulsar-client-go/pulsar"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.uber.org/zap"
)
var errUnrecognizedEncoding = fmt.Errorf("unrecognized encoding")
// pulsarMetricsProducer uses sarama to produce metrics messages to pulsar
type pulsarMetricsProducer struct {
producer pulsar.Producer
marshaler MetricsMarshaler
logger *zap.Logger
}
type pulsarErrors struct {
err string
}
func (pe pulsarErrors) Error() string {
return fmt.Sprintf("Failed to deliver messages due to %s", pe.err)
}
func (e *pulsarMetricsProducer) metricsDataPusher(_ context.Context, md pmetric.Metrics) error {
messages, err := e.marshaler.Marshal(md)
if err != nil {
return consumererror.NewPermanent(err)
}
for _, element := range messages { // (1) pulsar at the time of implementing this did not support sending an array of messages. (2) Use array index if needed to propagate back the errors
_, err = e.producer.Send(context.Background(), element)
}
if err != nil {
log.Fatal(err)
return pulsarErrors{err.Error()}
}
return nil
}
func newPulsarProducer(config Config) (pulsar.Producer, error) {
client, err := pulsar.NewClient(pulsar.ClientOptions{
URL: config.Brokers,
OperationTimeout: 30 * time.Second,
ConnectionTimeout: 30 * time.Second,
})
if err != nil {
log.Fatalf("Could not instantiate Pulsar client: %v", err)
}
producer, err := client.CreateProducer(pulsar.ProducerOptions{
Topic: config.Topic,
})
if err != nil {
return nil, err
}
return producer, nil
}
func newMetricsExporter(config Config, set component.ExporterCreateSettings, marshalers map[string]MetricsMarshaler) (*pulsarMetricsProducer, error) {
marshaler := marshalers[config.Encoding]
if marshaler == nil {
return nil, errUnrecognizedEncoding
}
producer, err := newPulsarProducer(config)
if err != nil {
log.Fatal(err)
}
if err != nil {
return nil, err
}
return &pulsarMetricsProducer{
producer: producer,
marshaler: marshaler,
logger: set.Logger,
}, nil
}
func (e *pulsarMetricsProducer) Close(context.Context) error {
e.producer.Close()
return nil // TODO: check return
}