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heartbeat.go
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heartbeat.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 fluentforwardreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/fluentforwardreceiver"
import (
"context"
"errors"
"net"
"syscall"
"go.uber.org/zap"
)
// See https://github.com/fluent/fluentd/wiki/Forward-Protocol-Specification-v1#heartbeat-message
func respondToHeartbeats(ctx context.Context, udpSock net.PacketConn, logger *zap.Logger) {
go func() {
<-ctx.Done()
udpSock.Close()
}()
buf := make([]byte, 1)
for {
n, addr, err := udpSock.ReadFrom(buf)
if err != nil || n == 0 {
if ctx.Err() != nil || errors.Is(err, syscall.EINVAL) {
return
}
continue
}
// Technically the heartbeat should be a byte 0x00 but just echo back
// whatever the client sent and move on.
_, err = udpSock.WriteTo(buf, addr)
if err != nil {
logger.Debug("Failed to write back heartbeat packet", zap.String("addr", addr.String()), zap.Error(err))
}
}
}