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receiver.go
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receiver.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package statsdreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/statsdreceiver"
import (
"context"
"errors"
"fmt"
"net"
"strings"
"time"
"go.opentelemetry.io/collector/client"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.opentelemetry.io/collector/receiver"
"go.uber.org/zap"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/statsdreceiver/internal/protocol"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/statsdreceiver/internal/transport"
)
var _ receiver.Metrics = (*statsdReceiver)(nil)
// statsdReceiver implements the receiver.Metrics for StatsD protocol.
type statsdReceiver struct {
settings receiver.CreateSettings
config *Config
server transport.Server
reporter transport.Reporter
parser protocol.Parser
nextConsumer consumer.Metrics
cancel context.CancelFunc
}
// newReceiver creates the StatsD receiver with the given parameters.
func newReceiver(
set receiver.CreateSettings,
config Config,
nextConsumer consumer.Metrics,
) (receiver.Metrics, error) {
if nextConsumer == nil {
return nil, component.ErrNilNextConsumer
}
if config.NetAddr.Endpoint == "" {
config.NetAddr.Endpoint = "localhost:8125"
}
rep, err := newReporter(set)
if err != nil {
return nil, err
}
r := &statsdReceiver{
settings: set,
config: &config,
nextConsumer: nextConsumer,
reporter: rep,
parser: &protocol.StatsDParser{
BuildInfo: set.BuildInfo,
},
}
return r, nil
}
func buildTransportServer(config Config) (transport.Server, error) {
// TODO: Add TCP/unix socket transport implementations
switch strings.ToLower(config.NetAddr.Transport) {
case "", "udp":
return transport.NewUDPServer(config.NetAddr.Endpoint)
case "tcp":
return transport.NewTCPServer(config.NetAddr.Endpoint)
}
return nil, fmt.Errorf("unsupported transport %q", config.NetAddr.Transport)
}
// Start starts a UDP server that can process StatsD messages.
func (r *statsdReceiver) Start(ctx context.Context, host component.Host) error {
ctx, r.cancel = context.WithCancel(ctx)
server, err := buildTransportServer(*r.config)
if err != nil {
return err
}
r.server = server
transferChan := make(chan transport.Metric, 10)
ticker := time.NewTicker(r.config.AggregationInterval)
err = r.parser.Initialize(
r.config.EnableMetricType,
r.config.IsMonotonicCounter,
r.config.TimerHistogramMapping,
)
if err != nil {
return err
}
go func() {
if err := r.server.ListenAndServe(r.parser, r.nextConsumer, r.reporter, transferChan); err != nil {
if !errors.Is(err, net.ErrClosed) {
host.ReportFatalError(err)
}
}
}()
go func() {
for {
select {
case <-ticker.C:
batchMetrics := r.parser.GetMetrics()
for _, batch := range batchMetrics {
batchCtx := client.NewContext(ctx, batch.Info)
if err := r.Flush(batchCtx, batch.Metrics, r.nextConsumer); err != nil {
r.reporter.OnDebugf("Error flushing metrics", zap.Error(err))
}
}
case metric := <-transferChan:
if err := r.parser.Aggregate(metric.Raw, metric.Addr); err != nil {
r.reporter.OnDebugf("Error aggregating metric", zap.Error(err))
}
case <-ctx.Done():
ticker.Stop()
return
}
}
}()
return nil
}
// Shutdown stops the StatsD receiver.
func (r *statsdReceiver) Shutdown(context.Context) error {
if r.cancel == nil || r.server == nil {
return nil
}
err := r.server.Close()
r.cancel()
return err
}
func (r *statsdReceiver) Flush(ctx context.Context, metrics pmetric.Metrics, nextConsumer consumer.Metrics) error {
return nextConsumer.ConsumeMetrics(ctx, metrics)
}