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pulsar_receiver.go
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/
pulsar_receiver.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package pulsarreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/pulsarreceiver"
import (
"context"
"errors"
"strings"
"time"
"github.com/apache/pulsar-client-go/pulsar"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/receiver"
"go.uber.org/zap"
)
var errUnrecognizedEncoding = errors.New("unrecognized encoding")
const alreadyClosedError = "AlreadyClosedError"
type pulsarTracesConsumer struct {
tracesConsumer consumer.Traces
topic string
client pulsar.Client
cancel context.CancelFunc
consumer pulsar.Consumer
unmarshaler TracesUnmarshaler
settings receiver.CreateSettings
consumerOptions pulsar.ConsumerOptions
}
func newTracesReceiver(config Config, set receiver.CreateSettings, unmarshalers map[string]TracesUnmarshaler, nextConsumer consumer.Traces) (*pulsarTracesConsumer, error) {
unmarshaler := unmarshalers[config.Encoding]
if nil == unmarshaler {
return nil, errUnrecognizedEncoding
}
options := config.clientOptions()
client, err := pulsar.NewClient(options)
if err != nil {
return nil, err
}
consumerOptions, err := config.consumerOptions()
if err != nil {
return nil, err
}
return &pulsarTracesConsumer{
tracesConsumer: nextConsumer,
topic: config.Topic,
unmarshaler: unmarshaler,
settings: set,
client: client,
consumerOptions: consumerOptions,
}, nil
}
func (c *pulsarTracesConsumer) Start(context.Context, component.Host) error {
ctx, cancel := context.WithCancel(context.Background())
c.cancel = cancel
_consumer, err := c.client.Subscribe(c.consumerOptions)
if err == nil {
c.consumer = _consumer
go func() {
if e := consumerTracesLoop(ctx, c); e != nil {
c.settings.Logger.Error("consume traces loop occurs an error", zap.Error(e))
}
}()
}
return err
}
func consumerTracesLoop(ctx context.Context, c *pulsarTracesConsumer) error {
unmarshaler := c.unmarshaler
traceConsumer := c.tracesConsumer
for {
message, err := c.consumer.Receive(ctx)
if err != nil {
if strings.Contains(err.Error(), alreadyClosedError) {
return err
}
if errors.Is(err, context.Canceled) {
c.settings.Logger.Info("exiting consume traces loop")
return err
}
c.settings.Logger.Error("failed to receive traces message from Pulsar, waiting for one second before retrying", zap.Error(err))
time.Sleep(time.Second)
continue
}
traces, err := unmarshaler.Unmarshal(message.Payload())
if err != nil {
c.settings.Logger.Error("failed to unmarshaler traces message", zap.Error(err))
c.consumer.Ack(message)
return err
}
if err := traceConsumer.ConsumeTraces(context.Background(), traces); err != nil {
c.settings.Logger.Error("consume traces failed", zap.Error(err))
}
c.consumer.Ack(message)
}
}
func (c *pulsarTracesConsumer) Shutdown(context.Context) error {
if c.cancel == nil {
return nil
}
c.cancel()
c.consumer.Close()
c.client.Close()
return nil
}
type pulsarMetricsConsumer struct {
metricsConsumer consumer.Metrics
unmarshaler MetricsUnmarshaler
topic string
client pulsar.Client
consumer pulsar.Consumer
cancel context.CancelFunc
settings receiver.CreateSettings
consumerOptions pulsar.ConsumerOptions
}
func newMetricsReceiver(config Config, set receiver.CreateSettings, unmarshalers map[string]MetricsUnmarshaler, nextConsumer consumer.Metrics) (*pulsarMetricsConsumer, error) {
unmarshaler := unmarshalers[config.Encoding]
if nil == unmarshaler {
return nil, errUnrecognizedEncoding
}
options := config.clientOptions()
client, err := pulsar.NewClient(options)
if err != nil {
return nil, err
}
consumerOptions, err := config.consumerOptions()
if err != nil {
return nil, err
}
return &pulsarMetricsConsumer{
metricsConsumer: nextConsumer,
topic: config.Topic,
unmarshaler: unmarshaler,
settings: set,
client: client,
consumerOptions: consumerOptions,
}, nil
}
func (c *pulsarMetricsConsumer) Start(context.Context, component.Host) error {
ctx, cancel := context.WithCancel(context.Background())
c.cancel = cancel
_consumer, err := c.client.Subscribe(c.consumerOptions)
if err == nil {
c.consumer = _consumer
go func() {
if e := consumeMetricsLoop(ctx, c); e != nil {
c.settings.Logger.Error("consume metrics loop occurs an error", zap.Error(e))
}
}()
}
return err
}
func consumeMetricsLoop(ctx context.Context, c *pulsarMetricsConsumer) error {
unmarshaler := c.unmarshaler
metricsConsumer := c.metricsConsumer
for {
message, err := c.consumer.Receive(ctx)
if err != nil {
if strings.Contains(err.Error(), alreadyClosedError) {
return err
}
if errors.Is(err, context.Canceled) {
c.settings.Logger.Info("exiting consume metrics loop")
return err
}
c.settings.Logger.Error("failed to receive metrics message from Pulsar, waiting for one second before retrying", zap.Error(err))
time.Sleep(time.Second)
continue
}
metrics, err := unmarshaler.Unmarshal(message.Payload())
if err != nil {
c.settings.Logger.Error("failed to unmarshaler metrics message", zap.Error(err))
c.consumer.Ack(message)
return err
}
if err := metricsConsumer.ConsumeMetrics(context.Background(), metrics); err != nil {
c.settings.Logger.Error("consume traces failed", zap.Error(err))
}
c.consumer.Ack(message)
}
}
func (c *pulsarMetricsConsumer) Shutdown(context.Context) error {
if c.cancel == nil {
return nil
}
c.cancel()
c.consumer.Close()
c.client.Close()
return nil
}
type pulsarLogsConsumer struct {
logsConsumer consumer.Logs
unmarshaler LogsUnmarshaler
topic string
client pulsar.Client
consumer pulsar.Consumer
cancel context.CancelFunc
settings receiver.CreateSettings
consumerOptions pulsar.ConsumerOptions
}
func newLogsReceiver(config Config, set receiver.CreateSettings, unmarshalers map[string]LogsUnmarshaler, nextConsumer consumer.Logs) (*pulsarLogsConsumer, error) {
unmarshaler := unmarshalers[config.Encoding]
if nil == unmarshaler {
return nil, errUnrecognizedEncoding
}
options := config.clientOptions()
client, err := pulsar.NewClient(options)
if err != nil {
return nil, err
}
consumerOptions, err := config.consumerOptions()
if err != nil {
return nil, err
}
return &pulsarLogsConsumer{
logsConsumer: nextConsumer,
topic: config.Topic,
cancel: nil,
unmarshaler: unmarshaler,
settings: set,
client: client,
consumerOptions: consumerOptions,
}, nil
}
func (c *pulsarLogsConsumer) Start(context.Context, component.Host) error {
ctx, cancel := context.WithCancel(context.Background())
c.cancel = cancel
_consumer, err := c.client.Subscribe(c.consumerOptions)
if err == nil {
c.consumer = _consumer
go func() {
if e := consumeLogsLoop(ctx, c); e != nil {
c.settings.Logger.Error("consume logs loop occurs an error", zap.Error(e))
}
}()
}
return err
}
func consumeLogsLoop(ctx context.Context, c *pulsarLogsConsumer) error {
unmarshaler := c.unmarshaler
logsConsumer := c.logsConsumer
for {
message, err := c.consumer.Receive(ctx)
if err != nil {
if strings.Contains(err.Error(), alreadyClosedError) {
return err
}
if errors.Is(err, context.Canceled) {
c.settings.Logger.Info("exiting consume traces loop canceled")
return err
}
c.settings.Logger.Error("failed to receive logs message from Pulsar, waiting for one second before retrying", zap.Error(err))
time.Sleep(time.Second)
continue
}
logs, err := unmarshaler.Unmarshal(message.Payload())
if err != nil {
c.settings.Logger.Error("failed to unmarshaler logs message", zap.Error(err))
c.consumer.Ack(message)
return err
}
if err := logsConsumer.ConsumeLogs(context.Background(), logs); err != nil {
c.settings.Logger.Error("consume traces failed", zap.Error(err))
}
c.consumer.Ack(message)
}
}
func (c *pulsarLogsConsumer) Shutdown(context.Context) error {
if c.cancel == nil {
return nil
}
c.cancel()
c.consumer.Close()
c.client.Close()
return nil
}