/
zipkin.go
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/
zipkin.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 zipkinexporter
import (
"bytes"
"context"
"fmt"
"net/http"
"time"
commonpb "github.com/census-instrumentation/opencensus-proto/gen-go/agent/common/v1"
resourcepb "github.com/census-instrumentation/opencensus-proto/gen-go/resource/v1"
zipkinmodel "github.com/openzipkin/zipkin-go/model"
zipkinproto "github.com/openzipkin/zipkin-go/proto/v2"
zipkinreporter "github.com/openzipkin/zipkin-go/reporter"
"go.opencensus.io/trace"
"go.uber.org/zap"
"github.com/open-telemetry/opentelemetry-collector/component"
"github.com/open-telemetry/opentelemetry-collector/config/configmodels"
"github.com/open-telemetry/opentelemetry-collector/consumer/consumerdata"
"github.com/open-telemetry/opentelemetry-collector/consumer/consumererror"
"github.com/open-telemetry/opentelemetry-collector/exporter/exporterhelper"
spandatatranslator "github.com/open-telemetry/opentelemetry-collector/translator/trace/spandata"
"github.com/open-telemetry/opentelemetry-collector/translator/trace/zipkin"
)
// zipkinExporter is a multiplexing exporter that spawns a new OpenCensus-Go Zipkin
// exporter per unique node encountered. This is because serviceNames per node define
// unique services, alongside their IPs. Also it is useful to receive traffic from
// Zipkin servers and then transform them back to the final form when creating an
// OpenCensus spandata.
type zipkinExporter struct {
defaultServiceName string
exportResourceLabels bool
url string
client *http.Client
serializer zipkinreporter.SpanSerializer
}
// Default values for Zipkin endpoint.
const (
defaultTimeout = time.Second * 5
defaultServiceName string = "<missing service name>"
DefaultExportResourceLabels = true
DefaultZipkinEndpointHostPort = "localhost:9411"
DefaultZipkinEndpointURL = "http://" + DefaultZipkinEndpointHostPort + "/api/v2/spans"
)
// NewTraceExporter creates an zipkin trace exporter.
func NewTraceExporter(logger *zap.Logger, config configmodels.Exporter) (component.TraceExporterOld, error) {
ze, err := createZipkinExporter(logger, config)
if err != nil {
return nil, err
}
zexp, err := exporterhelper.NewTraceExporterOld(
config,
ze.PushTraceData)
if err != nil {
return nil, err
}
return zexp, nil
}
func createZipkinExporter(logger *zap.Logger, config configmodels.Exporter) (*zipkinExporter, error) {
zCfg := config.(*Config)
serviceName := defaultServiceName
if zCfg.DefaultServiceName != "" {
serviceName = zCfg.DefaultServiceName
}
exportResourceLabels := DefaultExportResourceLabels
if zCfg.ExportResourceLabels != nil {
exportResourceLabels = *zCfg.ExportResourceLabels
}
ze := &zipkinExporter{
defaultServiceName: serviceName,
exportResourceLabels: exportResourceLabels,
url: zCfg.URL,
client: &http.Client{Timeout: defaultTimeout},
}
switch zCfg.Format {
case "json":
ze.serializer = zipkinreporter.JSONSerializer{}
case "proto":
ze.serializer = zipkinproto.SpanSerializer{}
default:
return nil, fmt.Errorf("%s is not one of json or proto", zCfg.Format)
}
return ze, nil
}
func (ze *zipkinExporter) PushTraceData(ctx context.Context, td consumerdata.TraceData) (int, error) {
tbatch := []*zipkinmodel.SpanModel{}
var resource *resourcepb.Resource
if ze.exportResourceLabels {
resource = td.Resource
}
for _, span := range td.Spans {
sd, err := spandatatranslator.ProtoSpanToOCSpanData(span, resource)
if err != nil {
return len(td.Spans), consumererror.Permanent(err)
}
zs := ze.zipkinSpan(td.Node, sd)
tbatch = append(tbatch, &zs)
}
body, err := ze.serializer.Serialize(tbatch)
if err != nil {
return len(td.Spans), err
}
req, err := http.NewRequest("POST", ze.url, bytes.NewReader(body))
if err != nil {
return len(td.Spans), err
}
req.Header.Set("Content-Type", ze.serializer.ContentType())
resp, err := ze.client.Do(req)
if err != nil {
return len(td.Spans), err
}
_ = resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return len(td.Spans), fmt.Errorf("failed the request with status code %d", resp.StatusCode)
}
return 0, nil
}
func (ze *zipkinExporter) zipkinSpan(
node *commonpb.Node,
s *trace.SpanData,
) (zc zipkinmodel.SpanModel) {
return zipkin.OCSpanDataToZipkin(node, s, ze.defaultServiceName)
}