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exporter.go
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exporter.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 jaegerexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/jaegerexporter"
import (
"context"
"fmt"
"sync"
"time"
jaegerproto "github.com/jaegertracing/jaeger/proto-gen/api_v2"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config/configgrpc"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/exporter/exporterhelper"
"go.opentelemetry.io/collector/model/pdata"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/metadata"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/translator/jaeger"
)
// newTracesExporter returns a new Jaeger gRPC exporter.
// The exporter name is the name to be used in the observability of the exporter.
// The collectorEndpoint should be of the form "hostname:14250" (a gRPC target).
func newTracesExporter(cfg *Config, set component.ExporterCreateSettings) (component.TracesExporter, error) {
s := newProtoGRPCSender(cfg, set.TelemetrySettings)
return exporterhelper.NewTracesExporter(
cfg, set, s.pushTraces,
exporterhelper.WithCapabilities(consumer.Capabilities{MutatesData: false}),
exporterhelper.WithStart(s.start),
exporterhelper.WithShutdown(s.shutdown),
exporterhelper.WithTimeout(cfg.TimeoutSettings),
exporterhelper.WithRetry(cfg.RetrySettings),
exporterhelper.WithQueue(cfg.QueueSettings),
)
}
// protoGRPCSender forwards spans encoded in the jaeger proto
// format, to a grpc server.
type protoGRPCSender struct {
name string
settings component.TelemetrySettings
client jaegerproto.CollectorServiceClient
metadata metadata.MD
waitForReady bool
conn stateReporter
connStateReporterInterval time.Duration
stateChangeCallbacks []func(connectivity.State)
stopCh chan struct{}
stopped bool
stopLock sync.Mutex
clientSettings *configgrpc.GRPCClientSettings
}
func newProtoGRPCSender(cfg *Config, settings component.TelemetrySettings) *protoGRPCSender {
s := &protoGRPCSender{
name: cfg.ID().String(),
settings: settings,
metadata: metadata.New(cfg.GRPCClientSettings.Headers),
waitForReady: cfg.WaitForReady,
connStateReporterInterval: time.Second,
stopCh: make(chan struct{}),
clientSettings: &cfg.GRPCClientSettings,
}
s.AddStateChangeCallback(s.onStateChange)
return s
}
type stateReporter interface {
GetState() connectivity.State
}
func (s *protoGRPCSender) pushTraces(
ctx context.Context,
td pdata.Traces,
) error {
batches, err := jaeger.ProtoFromTraces(td)
if err != nil {
return consumererror.NewPermanent(fmt.Errorf("failed to push trace data via Jaeger exporter: %w", err))
}
if s.metadata.Len() > 0 {
ctx = metadata.NewOutgoingContext(ctx, s.metadata)
}
for _, batch := range batches {
_, err = s.client.PostSpans(
ctx,
&jaegerproto.PostSpansRequest{Batch: *batch}, grpc.WaitForReady(s.waitForReady))
if err != nil {
s.settings.Logger.Debug("failed to push trace data to Jaeger", zap.Error(err))
return fmt.Errorf("failed to push trace data via Jaeger exporter: %w", err)
}
}
return nil
}
func (s *protoGRPCSender) shutdown(context.Context) error {
s.stopLock.Lock()
s.stopped = true
s.stopLock.Unlock()
close(s.stopCh)
return nil
}
func (s *protoGRPCSender) start(_ context.Context, host component.Host) error {
if s.clientSettings == nil {
return fmt.Errorf("client settings not found")
}
opts, err := s.clientSettings.ToDialOptions(host, s.settings)
if err != nil {
return err
}
conn, err := grpc.Dial(s.clientSettings.Endpoint, opts...)
if err != nil {
return err
}
s.client = jaegerproto.NewCollectorServiceClient(conn)
s.conn = conn
go s.startConnectionStatusReporter()
return nil
}
func (s *protoGRPCSender) startConnectionStatusReporter() {
connState := s.conn.GetState()
s.propagateStateChange(connState)
ticker := time.NewTicker(s.connStateReporterInterval)
for {
select {
case <-ticker.C:
s.stopLock.Lock()
if s.stopped {
s.stopLock.Unlock()
return
}
st := s.conn.GetState()
if connState != st {
// state has changed, report it
connState = st
s.propagateStateChange(st)
}
s.stopLock.Unlock()
case <-s.stopCh:
return
}
}
}
func (s *protoGRPCSender) propagateStateChange(st connectivity.State) {
for _, callback := range s.stateChangeCallbacks {
callback(st)
}
}
func (s *protoGRPCSender) onStateChange(st connectivity.State) {
mCtx, _ := tag.New(context.Background(), tag.Upsert(tag.MustNewKey("exporter_name"), s.name))
stats.Record(mCtx, mLastConnectionState.M(int64(st)))
s.settings.Logger.Info("State of the connection with the Jaeger Collector backend", zap.Stringer("state", st))
}
func (s *protoGRPCSender) AddStateChangeCallback(f func(connectivity.State)) {
s.stateChangeCallbacks = append(s.stateChangeCallbacks, f)
}