/
receiver.go
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/
receiver.go
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// Copyright 2020 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 (
"context"
"net"
"strings"
"go.uber.org/zap"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/consumer"
)
// Give the event channel a bit of buffer to help reduce backpressure on
// FluentBit and increase throughput.
const eventChannelLength = 100
type fluentReceiver struct {
collector *Collector
listener net.Listener
conf *Config
logger *zap.Logger
server *server
cancel context.CancelFunc
}
func newFluentReceiver(logger *zap.Logger, conf *Config, next consumer.LogsConsumer) (component.LogsReceiver, error) {
eventCh := make(chan Event, eventChannelLength)
collector := newCollector(eventCh, next, logger)
server := newServer(eventCh, logger)
return &fluentReceiver{
collector: collector,
server: server,
conf: conf,
logger: logger,
}, nil
}
func (r *fluentReceiver) Start(ctx context.Context, _ component.Host) error {
receiverCtx, cancel := context.WithCancel(ctx)
r.cancel = cancel
r.collector.Start(receiverCtx)
listenAddr := r.conf.ListenAddress
var listener net.Listener
var udpListener net.PacketConn
var err error
if strings.HasPrefix(listenAddr, "/") || strings.HasPrefix(listenAddr, "unix://") {
listener, err = net.Listen("unix", strings.TrimPrefix(listenAddr, "unix://"))
} else {
listener, err = net.Listen("tcp", listenAddr)
if err == nil {
udpListener, err = net.ListenPacket("udp", listenAddr)
}
}
if err != nil {
return err
}
r.listener = listener
r.server.Start(receiverCtx, listener)
if udpListener != nil {
go respondToHeartbeats(receiverCtx, udpListener, r.logger)
}
return nil
}
func (r *fluentReceiver) Shutdown(context.Context) error {
r.cancel()
return nil
}