/
opencensus.go
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/
opencensus.go
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// Copyright 2019, 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 opencensusexporter
import (
"context"
"fmt"
"sync"
"contrib.go.opencensus.io/exporter/ocagent"
agentmetricspb "github.com/census-instrumentation/opencensus-proto/gen-go/agent/metrics/v1"
agenttracepb "github.com/census-instrumentation/opencensus-proto/gen-go/agent/trace/v1"
"go.uber.org/zap"
"github.com/open-telemetry/opentelemetry-collector/config/configmodels"
"github.com/open-telemetry/opentelemetry-collector/consumer/consumerdata"
"github.com/open-telemetry/opentelemetry-collector/exporter"
"github.com/open-telemetry/opentelemetry-collector/exporter/exporterhelper"
"github.com/open-telemetry/opentelemetry-collector/oterr"
)
type ocAgentExporter struct {
exporters chan *ocagent.Exporter
}
type ocExporterErrorCode int
type ocExporterError struct {
code ocExporterErrorCode
msg string
}
var _ error = (*ocExporterError)(nil)
func (e *ocExporterError) Error() string {
return e.msg
}
const (
defaultNumWorkers int = 2
_ ocExporterErrorCode = iota // skip 0
// errEndpointRequired indicates that this exporter was not provided with an endpoint in its config.
errEndpointRequired
// errUnsupportedCompressionType indicates that this exporter was provided with a compression protocol it does not support.
errUnsupportedCompressionType
// errUnableToGetTLSCreds indicates that this exporter could not read the provided TLS credentials.
errUnableToGetTLSCreds
// errAlreadyStopped indicates that the exporter was already stopped.
errAlreadyStopped
)
// NewTraceExporter creates an Open Census trace exporter.
func NewTraceExporter(logger *zap.Logger, config configmodels.Exporter, opts ...ocagent.ExporterOption) (exporter.TraceExporter, error) {
oce, err := createOCAgentExporter(logger, config, opts...)
if err != nil {
return nil, err
}
oexp, err := exporterhelper.NewTraceExporter(
config,
oce.PushTraceData,
exporterhelper.WithTracing(true),
exporterhelper.WithMetrics(true),
exporterhelper.WithShutdown(oce.Shutdown))
if err != nil {
return nil, err
}
return oexp, nil
}
// createOCAgentExporter takes ocagent exporter options and create an OC exporter
func createOCAgentExporter(logger *zap.Logger, config configmodels.Exporter, opts ...ocagent.ExporterOption) (*ocAgentExporter, error) {
oCfg := config.(*Config)
numWorkers := defaultNumWorkers
if oCfg.NumWorkers > 0 {
numWorkers = oCfg.NumWorkers
}
exportersChan := make(chan *ocagent.Exporter, numWorkers)
for exporterIndex := 0; exporterIndex < numWorkers; exporterIndex++ {
// TODO: ocagent.NewExporter blocks for connection. Now that we have ability
// to report errors asynchronously using Host.ReportFatalError we can move this
// code to Start() and do it in background to avoid blocking Collector startup
// as we do now.
exporter, serr := ocagent.NewExporter(opts...)
if serr != nil {
return nil, fmt.Errorf("cannot configure OpenCensus exporter: %v", serr)
}
exportersChan <- exporter
}
oce := &ocAgentExporter{exporters: exportersChan}
return oce, nil
}
// NewMetricsExporter creates an Open Census metrics exporter.
func NewMetricsExporter(logger *zap.Logger, config configmodels.Exporter, opts ...ocagent.ExporterOption) (exporter.MetricsExporter, error) {
oce, err := createOCAgentExporter(logger, config, opts...)
if err != nil {
return nil, err
}
oexp, err := exporterhelper.NewMetricsExporter(
config,
oce.PushMetricsData,
exporterhelper.WithTracing(true),
exporterhelper.WithMetrics(true),
exporterhelper.WithShutdown(oce.Shutdown))
if err != nil {
return nil, err
}
return oexp, nil
}
func (oce *ocAgentExporter) Shutdown() error {
wg := &sync.WaitGroup{}
var errors []error
var errorsMu sync.Mutex
visitedCnt := 0
for currExporter := range oce.exporters {
wg.Add(1)
go func(exporter *ocagent.Exporter) {
defer wg.Done()
err := exporter.Stop()
if err != nil {
errorsMu.Lock()
errors = append(errors, err)
errorsMu.Unlock()
}
}(currExporter)
visitedCnt++
if visitedCnt == cap(oce.exporters) {
// Visited and started Stop on all exporters, just wait for the stop to finish.
break
}
}
wg.Wait()
close(oce.exporters)
return oterr.CombineErrors(errors)
}
func (oce *ocAgentExporter) PushTraceData(ctx context.Context, td consumerdata.TraceData) (int, error) {
// Get first available exporter.
exporter, ok := <-oce.exporters
if !ok {
err := &ocExporterError{
code: errAlreadyStopped,
msg: fmt.Sprintf("OpenCensus exporter was already stopped."),
}
return len(td.Spans), err
}
err := exporter.ExportTraceServiceRequest(
&agenttracepb.ExportTraceServiceRequest{
Spans: td.Spans,
Resource: td.Resource,
Node: td.Node,
},
)
oce.exporters <- exporter
if err != nil {
return len(td.Spans), err
}
return 0, nil
}
func (oce *ocAgentExporter) PushMetricsData(ctx context.Context, md consumerdata.MetricsData) (int, error) {
// Get first available exporter.
exporter, ok := <-oce.exporters
if !ok {
err := &ocExporterError{
code: errAlreadyStopped,
msg: fmt.Sprintf("OpenCensus exporter was already stopped."),
}
return exporterhelper.NumTimeSeries(md), err
}
req := &agentmetricspb.ExportMetricsServiceRequest{
Metrics: md.Metrics,
Resource: md.Resource,
Node: md.Node,
}
err := exporter.ExportMetricsServiceRequest(req)
oce.exporters <- exporter
if err != nil {
return exporterhelper.NumTimeSeries(md), err
}
return 0, nil
}