/
protospan_to_jaegerthrift.go
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/
protospan_to_jaegerthrift.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 jaeger
import (
"fmt"
commonpb "github.com/census-instrumentation/opencensus-proto/gen-go/agent/common/v1"
resourcepb "github.com/census-instrumentation/opencensus-proto/gen-go/resource/v1"
tracepb "github.com/census-instrumentation/opencensus-proto/gen-go/trace/v1"
"github.com/golang/protobuf/ptypes"
"github.com/golang/protobuf/ptypes/timestamp"
"github.com/jaegertracing/jaeger/thrift-gen/jaeger"
"github.com/open-telemetry/opentelemetry-collector/consumer/consumerdata"
tracetranslator "github.com/open-telemetry/opentelemetry-collector/translator/trace"
)
var (
unknownProcess = &jaeger.Process{ServiceName: "unknown-service-name"}
)
// OCProtoToJaegerThrift translates OpenCensus trace data into the Jaeger Thrift format.
func OCProtoToJaegerThrift(td consumerdata.TraceData) (*jaeger.Batch, error) {
jSpans, err := ocSpansToJaegerSpans(td.Spans)
if err != nil {
return nil, err
}
jb := &jaeger.Batch{
Process: ocNodeAndResourceToJaegerProcess(td.Node, td.Resource),
Spans: jSpans,
}
return jb, nil
}
func ocNodeAndResourceToJaegerProcess(node *commonpb.Node, resource *resourcepb.Resource) *jaeger.Process {
if node == nil {
// Jaeger requires a non-nil Process
return unknownProcess
}
var jTags []*jaeger.Tag
nodeAttribsLen := len(node.Attributes)
if nodeAttribsLen > 0 {
jTags = make([]*jaeger.Tag, 0, nodeAttribsLen)
for k, v := range node.Attributes {
str := v
jTag := &jaeger.Tag{
Key: k,
VType: jaeger.TagType_STRING,
VStr: &str,
}
jTags = append(jTags, jTag)
}
}
if node.Identifier != nil {
if node.Identifier.HostName != "" {
hostTag := &jaeger.Tag{
Key: "hostname",
VType: jaeger.TagType_STRING,
VStr: &node.Identifier.HostName,
}
jTags = append(jTags, hostTag)
}
if node.Identifier.Pid != 0 {
pid := int64(node.Identifier.Pid)
hostTag := &jaeger.Tag{
Key: "pid",
VType: jaeger.TagType_LONG,
VLong: &pid,
}
jTags = append(jTags, hostTag)
}
if node.Identifier.StartTimestamp != nil && node.Identifier.StartTimestamp.Seconds != 0 {
startTimeStr := ptypes.TimestampString(node.Identifier.StartTimestamp)
hostTag := &jaeger.Tag{
Key: "start.time",
VType: jaeger.TagType_STRING,
VStr: &startTimeStr,
}
jTags = append(jTags, hostTag)
}
}
// Add OpenCensus library information as tags if available
ocLib := node.LibraryInfo
if ocLib != nil {
// Only add language if specified
if ocLib.Language != commonpb.LibraryInfo_LANGUAGE_UNSPECIFIED {
languageStr := ocLib.Language.String()
languageTag := &jaeger.Tag{
Key: opencensusLanguage,
VType: jaeger.TagType_STRING,
VStr: &languageStr,
}
jTags = append(jTags, languageTag)
}
if ocLib.ExporterVersion != "" {
exporterTag := &jaeger.Tag{
Key: opencensusExporterVersion,
VType: jaeger.TagType_STRING,
VStr: &ocLib.ExporterVersion,
}
jTags = append(jTags, exporterTag)
}
if ocLib.CoreLibraryVersion != "" {
exporterTag := &jaeger.Tag{
Key: opencensusCoreLibVersion,
VType: jaeger.TagType_STRING,
VStr: &ocLib.CoreLibraryVersion,
}
jTags = append(jTags, exporterTag)
}
}
var serviceName string
if node.ServiceInfo != nil && node.ServiceInfo.Name != "" {
serviceName = node.ServiceInfo.Name
}
if resource != nil {
resourceType := resource.GetType()
if resourceType != "" {
resourceTypeTag := &jaeger.Tag{
Key: opencensusResourceType,
VType: jaeger.TagType_STRING,
VStr: &resourceType,
}
jTags = append(jTags, resourceTypeTag)
}
for k, v := range resource.GetLabels() {
str := v
resourceTag := &jaeger.Tag{
Key: k,
VType: jaeger.TagType_STRING,
VStr: &str,
}
jTags = append(jTags, resourceTag)
}
}
if serviceName == "" && len(jTags) == 0 {
// No info to put in the process...
return nil
}
jProc := &jaeger.Process{
ServiceName: serviceName,
Tags: jTags,
}
return jProc
}
func ocSpansToJaegerSpans(ocSpans []*tracepb.Span) ([]*jaeger.Span, error) {
if ocSpans == nil {
return nil, nil
}
// Pre-allocate assuming that few, if any spans, are nil.
jSpans := make([]*jaeger.Span, 0, len(ocSpans))
for _, ocSpan := range ocSpans {
traceIDHigh, traceIDLow, err := tracetranslator.BytesToInt64TraceID(ocSpan.TraceId)
if err != nil {
return nil, fmt.Errorf("OC span has invalid trace ID: %v", err)
}
if traceIDLow == 0 && traceIDHigh == 0 {
return nil, errZeroTraceID
}
jReferences, err := ocLinksToJaegerReferences(ocSpan.Links)
if err != nil {
return nil, fmt.Errorf("error converting OC links to Jaeger references: %v", err)
}
spanID, err := tracetranslator.BytesToInt64SpanID(ocSpan.SpanId)
if err != nil {
return nil, fmt.Errorf("OC span has invalid span ID: %v", err)
}
if spanID == 0 {
return nil, errZeroSpanID
}
// OC ParentSpanId can be nil/empty: only attempt conversion if not nil/empty.
var parentSpanID int64
if len(ocSpan.ParentSpanId) != 0 {
parentSpanID, err = tracetranslator.BytesToInt64SpanID(ocSpan.ParentSpanId)
if err != nil {
return nil, fmt.Errorf("OC span has invalid parent span ID: %v", err)
}
}
startTime := timestampToEpochMicroseconds(ocSpan.StartTime)
jSpan := &jaeger.Span{
TraceIdLow: traceIDLow,
TraceIdHigh: traceIDHigh,
SpanId: spanID,
ParentSpanId: parentSpanID,
OperationName: truncableStringToStr(ocSpan.Name),
References: jReferences,
// Flags: TODO (@pjanotti) Nothing from OC-Proto seems to match the values for Flags see https://www.jaegertracing.io/docs/1.8/client-libraries/
StartTime: startTime,
Duration: timestampToEpochMicroseconds(ocSpan.EndTime) - startTime,
Tags: ocSpanAttributesToJaegerTags(ocSpan.Attributes),
Logs: ocTimeEventsToJaegerLogs(ocSpan.TimeEvents),
}
// Only add the "span.kind" tag if not set in the OC span attributes.
if !tracetranslator.OCAttributeKeyExist(ocSpan.Attributes, tracetranslator.TagSpanKind) {
jSpan.Tags = appendJaegerTagFromOCSpanKind(jSpan.Tags, ocSpan.Kind)
}
// Only add status tags if neither status.code and status.message are set in the OC span attributes.
if !tracetranslator.OCAttributeKeyExist(ocSpan.Attributes, tracetranslator.TagStatusCode) &&
!tracetranslator.OCAttributeKeyExist(ocSpan.Attributes, tracetranslator.TagStatusMsg) {
jSpan.Tags = appendJaegerThriftTagFromOCStatus(jSpan.Tags, ocSpan.Status)
}
jSpans = append(jSpans, jSpan)
}
return jSpans, nil
}
func ocLinksToJaegerReferences(ocSpanLinks *tracepb.Span_Links) ([]*jaeger.SpanRef, error) {
if ocSpanLinks == nil || ocSpanLinks.Link == nil {
return nil, nil
}
ocLinks := ocSpanLinks.Link
jRefs := make([]*jaeger.SpanRef, 0, len(ocLinks))
for _, ocLink := range ocLinks {
traceIDHigh, traceIDLow, err := tracetranslator.BytesToInt64TraceID(ocLink.TraceId)
if err != nil {
return nil, fmt.Errorf("OC link has invalid trace ID: %v", err)
}
var jRefType jaeger.SpanRefType
switch ocLink.Type {
case tracepb.Span_Link_PARENT_LINKED_SPAN:
jRefType = jaeger.SpanRefType_CHILD_OF
default:
// TODO: (@pjanotti) Jaeger doesn't have a unknown SpanRefType, it has FOLLOWS_FROM or CHILD_OF
// at first mapping all others to FOLLOWS_FROM.
jRefType = jaeger.SpanRefType_FOLLOWS_FROM
}
spanID, err := tracetranslator.BytesToInt64SpanID(ocLink.SpanId)
if err != nil {
return nil, fmt.Errorf("OC link has invalid span ID: %v", err)
}
jRef := &jaeger.SpanRef{
TraceIdLow: traceIDLow,
TraceIdHigh: traceIDHigh,
RefType: jRefType,
SpanId: spanID,
}
jRefs = append(jRefs, jRef)
}
return jRefs, nil
}
func appendJaegerThriftTagFromOCStatus(jTags []*jaeger.Tag, ocStatus *tracepb.Status) []*jaeger.Tag {
if ocStatus == nil {
return jTags
}
code := int64(ocStatus.Code)
jTags = append(jTags, &jaeger.Tag{
Key: tracetranslator.TagStatusCode,
VLong: &code,
VType: jaeger.TagType_LONG,
})
if ocStatus.Message != "" {
jTags = append(jTags, &jaeger.Tag{
Key: tracetranslator.TagStatusMsg,
VStr: &ocStatus.Message,
VType: jaeger.TagType_STRING,
})
}
return jTags
}
func appendJaegerTagFromOCSpanKind(jTags []*jaeger.Tag, ocSpanKind tracepb.Span_SpanKind) []*jaeger.Tag {
// Follow OpenTracing conventions to set span kind value as a tag.
var tagValue string
switch ocSpanKind {
case tracepb.Span_CLIENT:
tagValue = string(tracetranslator.OpenTracingSpanKindClient)
case tracepb.Span_SERVER:
tagValue = string(tracetranslator.OpenTracingSpanKindServer)
}
if tagValue != "" {
jTag := &jaeger.Tag{
Key: tracetranslator.TagSpanKind,
VStr: &tagValue,
VType: jaeger.TagType_STRING,
}
jTags = append(jTags, jTag)
}
return jTags
}
func ocTimeEventsToJaegerLogs(ocSpanTimeEvents *tracepb.Span_TimeEvents) []*jaeger.Log {
if ocSpanTimeEvents == nil || ocSpanTimeEvents.TimeEvent == nil {
return nil
}
ocTimeEvents := ocSpanTimeEvents.TimeEvent
// Assume that in general no time events are going to produce nil Jaeger logs.
jLogs := make([]*jaeger.Log, 0, len(ocTimeEvents))
for _, ocTimeEvent := range ocTimeEvents {
jLog := &jaeger.Log{
Timestamp: timestampToEpochMicroseconds(ocTimeEvent.Time),
}
switch teValue := ocTimeEvent.Value.(type) {
case *tracepb.Span_TimeEvent_Annotation_:
jLog.Fields = ocAnnotationToJagerTags(teValue.Annotation)
case *tracepb.Span_TimeEvent_MessageEvent_:
jLog.Fields = ocMessageEventToJaegerTags(teValue.MessageEvent)
default:
msg := "An unknown OpenCensus TimeEvent type was detected when translating to Jaeger"
jTag := &jaeger.Tag{
Key: ocTimeEventUnknownType,
VStr: &msg,
}
jLog.Fields = append(jLog.Fields, jTag)
}
jLogs = append(jLogs, jLog)
}
return jLogs
}
func ocAnnotationToJagerTags(annotation *tracepb.Span_TimeEvent_Annotation) []*jaeger.Tag {
if annotation == nil {
return nil
}
jTags := ocSpanAttributesToJaegerTags(annotation.Attributes)
desc := truncableStringToStr(annotation.Description)
if desc != "" {
jDescTag := &jaeger.Tag{
Key: tracetranslator.AnnotationDescriptionKey,
VStr: &desc,
VType: jaeger.TagType_STRING,
}
jTags = append(jTags, jDescTag)
}
return jTags
}
func ocMessageEventToJaegerTags(msgEvent *tracepb.Span_TimeEvent_MessageEvent) []*jaeger.Tag {
if msgEvent == nil {
return nil
}
jID := int64(msgEvent.Id)
idTag := &jaeger.Tag{
Key: tracetranslator.MessageEventIDKey,
VLong: &jID,
VType: jaeger.TagType_LONG,
}
msgTypeStr := msgEvent.Type.String()
msgType := &jaeger.Tag{
Key: tracetranslator.MessageEventTypeKey,
VStr: &msgTypeStr,
VType: jaeger.TagType_STRING,
}
// Some implementations always have these two fields as zeros.
if msgEvent.CompressedSize == 0 && msgEvent.UncompressedSize == 0 {
return []*jaeger.Tag{
idTag, msgType,
}
}
// There is a risk in this cast since we are converting from uint64, but
// seems a good compromise since the risk of such large values are small.
compSize := int64(msgEvent.CompressedSize)
compressedSize := &jaeger.Tag{
Key: tracetranslator.MessageEventCompressedSizeKey,
VLong: &compSize,
VType: jaeger.TagType_LONG,
}
uncompSize := int64(msgEvent.UncompressedSize)
uncompressedSize := &jaeger.Tag{
Key: tracetranslator.MessageEventUncompressedSizeKey,
VLong: &uncompSize,
VType: jaeger.TagType_LONG,
}
return []*jaeger.Tag{
idTag, msgType, compressedSize, uncompressedSize,
}
}
func truncableStringToStr(ts *tracepb.TruncatableString) string {
if ts == nil {
return ""
}
return ts.Value
}
func timestampToEpochMicroseconds(ts *timestamp.Timestamp) int64 {
if ts == nil {
return 0
}
return ts.GetSeconds()*1e6 + int64(ts.GetNanos()/1e3)
}
func ocSpanAttributesToJaegerTags(ocAttribs *tracepb.Span_Attributes) []*jaeger.Tag {
if ocAttribs == nil {
return nil
}
// Pre-allocate assuming that few attributes, if any at all, are nil.
jTags := make([]*jaeger.Tag, 0, len(ocAttribs.AttributeMap))
for key, attrib := range ocAttribs.AttributeMap {
if attrib == nil || attrib.Value == nil {
continue
}
jTag := &jaeger.Tag{Key: key}
switch attribValue := attrib.Value.(type) {
case *tracepb.AttributeValue_StringValue:
// Jaeger-to-OC maps binary tags to string attributes and encodes them as
// base64 strings. Blindingly attempting to decode base64 seems too much.
str := truncableStringToStr(attribValue.StringValue)
jTag.VStr = &str
jTag.VType = jaeger.TagType_STRING
case *tracepb.AttributeValue_IntValue:
i := attribValue.IntValue
jTag.VLong = &i
jTag.VType = jaeger.TagType_LONG
case *tracepb.AttributeValue_BoolValue:
b := attribValue.BoolValue
jTag.VBool = &b
jTag.VType = jaeger.TagType_BOOL
case *tracepb.AttributeValue_DoubleValue:
d := attribValue.DoubleValue
jTag.VDouble = &d
jTag.VType = jaeger.TagType_DOUBLE
default:
str := "<Unknown OpenCensus Attribute for key \"" + key + "\">"
jTag.VStr = &str
jTag.VType = jaeger.TagType_STRING
}
jTags = append(jTags, jTag)
}
return jTags
}