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receiver.go
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receiver.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:https://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 awsxrayreceiver
import (
"context"
"fmt"
"sync"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/component/componenterror"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/obsreport"
"go.uber.org/zap"
"github.com/open-telemetry/opentelemetry-collector-contrib/internal/awsxray"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awsxrayreceiver/internal/proxy"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awsxrayreceiver/internal/translator"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awsxrayreceiver/internal/udppoller"
)
const (
// number of goroutines polling the UDP socket.
// https://github.com/aws/aws-xray-daemon/blob/master/pkg/cfg/cfg.go#L184
maxPollerCount = 2
)
// xrayReceiver implements the component.TracesReceiver interface for converting
// AWS X-Ray segment document into the OT internal trace format.
type xrayReceiver struct {
instanceName string
poller udppoller.Poller
server proxy.Server
logger *zap.Logger
consumer consumer.TracesConsumer
longLivedCtx context.Context
startOnce sync.Once
stopOnce sync.Once
}
func newReceiver(config *Config,
consumer consumer.TracesConsumer,
logger *zap.Logger) (component.TracesReceiver, error) {
if consumer == nil {
return nil, componenterror.ErrNilNextConsumer
}
logger.Info("Going to listen on endpoint for X-Ray segments",
zap.String(udppoller.Transport, config.Endpoint))
poller, err := udppoller.New(&udppoller.Config{
ReceiverInstanceName: config.Name(),
Transport: config.Transport,
Endpoint: config.Endpoint,
NumOfPollerToStart: maxPollerCount,
}, logger)
if err != nil {
return nil, err
}
logger.Info("Listening on endpoint for X-Ray segments",
zap.String(udppoller.Transport, config.Endpoint))
srv, err := proxy.NewServer(config.ProxyServer, logger)
if err != nil {
return nil, err
}
return &xrayReceiver{
instanceName: config.Name(),
poller: poller,
server: srv,
logger: logger,
consumer: consumer,
}, nil
}
func (x *xrayReceiver) Start(ctx context.Context, host component.Host) error {
// TODO: Might want to pass `host` into read() below to report a fatal error
var err = componenterror.ErrAlreadyStarted
x.startOnce.Do(func() {
x.longLivedCtx = obsreport.ReceiverContext(ctx, x.instanceName, udppoller.Transport)
x.poller.Start(x.longLivedCtx)
go x.start()
go x.server.ListenAndServe()
x.logger.Info("X-Ray TCP proxy server started")
err = nil
})
return err
}
func (x *xrayReceiver) Shutdown(_ context.Context) error {
var err = componenterror.ErrAlreadyStopped
x.stopOnce.Do(func() {
err = nil
pollerErr := x.poller.Close()
if pollerErr != nil {
err = pollerErr
}
proxyErr := x.server.Close()
if proxyErr != nil {
if err == nil {
err = proxyErr
} else {
err = fmt.Errorf("failed to close proxy: %s: failed to close poller: %s",
proxyErr.Error(), err.Error())
}
}
})
return err
}
func (x *xrayReceiver) start() {
incomingSegments := x.poller.SegmentsChan()
for seg := range incomingSegments {
traces, totalSpansCount, err := translator.ToTraces(seg.Payload)
if err != nil {
x.logger.Warn("X-Ray segment to OT traces conversion failed", zap.Error(err))
obsreport.EndTraceDataReceiveOp(seg.Ctx, awsxray.TypeStr, totalSpansCount, err)
continue
}
err = x.consumer.ConsumeTraces(seg.Ctx, *traces)
if err != nil {
x.logger.Warn("Trace consumer errored out", zap.Error(err))
obsreport.EndTraceDataReceiveOp(seg.Ctx, awsxray.TypeStr, totalSpansCount, err)
continue
}
obsreport.EndTraceDataReceiveOp(seg.Ctx, awsxray.TypeStr, totalSpansCount, nil)
}
}