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tracer.go
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tracer.go
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package trace
import (
"log"
"net/http"
api "github.com/kyma-project/kyma/components/event-bus/api/publish"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
otlog "github.com/opentracing/opentracing-go/log"
zipkin "github.com/openzipkin/zipkin-go-opentracing"
)
const (
DefaultTraceAPIURL = ""
DefaultTraceHostPort = "0.0.0.0:0"
DefaultTraceServiceName = "trace-service"
DefaultTraceOperationName = "trace-operation"
)
type Options struct {
APIURL string
HostPort string
ServiceName string
OperationName string
Debug bool
}
type Tracer interface {
Started() bool
Options() *Options
Stop()
}
type OpenTracer struct {
opts Options
collector zipkin.Collector
}
func StartNewTracer(opts *Options) Tracer {
tracer := new(OpenTracer)
tracer.opts = *opts
tracer.Start()
return tracer
}
func (zk *OpenTracer) Start() {
if collector, err := zipkin.NewHTTPCollector(zk.opts.APIURL); err != nil {
log.Printf("Tracer :: Start :: Error creating Zipkin collector :: Error: %v", err)
} else {
recorder := zipkin.NewRecorder(collector, zk.opts.Debug, zk.opts.HostPort, zk.opts.ServiceName)
if tracer, err := zipkin.NewTracer(recorder, zipkin.TraceID128Bit(false)); err != nil {
log.Printf("Tracer :: Start :: Error creating Zipkin tracer :: Error: %v", err)
} else {
zk.collector = collector
opentracing.SetGlobalTracer(tracer)
}
}
}
func (zk *OpenTracer) Started() bool {
return zk.collector != nil
}
func (zk *OpenTracer) Options() *Options {
return &zk.opts
}
func (zk *OpenTracer) Stop() {
if zk.collector != nil {
zk.collector.Close()
}
}
func ReadTraceHeaders(header *http.Header) *opentracing.SpanContext {
if header == nil {
return nil
}
if spanContext, err := opentracing.GlobalTracer().Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(*header)); err != nil {
return nil
} else {
return &spanContext
}
}
func ReadTraceContext(traceContext *api.TraceContext) *opentracing.SpanContext {
if spanContext, err := opentracing.GlobalTracer().Extract(opentracing.TextMap, (*opentracing.TextMapCarrier)(traceContext)); err != nil {
return nil
} else {
return &spanContext
}
}
func StartSpan(spanContext *opentracing.SpanContext, operationName *string, opts ...opentracing.StartSpanOption) *opentracing.Span {
if spanContext != nil {
if opts == nil || len(opts) == 0 {
opts = make([]opentracing.StartSpanOption, 0)
}
opts = append(opts, opentracing.ChildOf(*spanContext))
}
span := opentracing.StartSpan(*operationName, opts...)
return &span
}
func WriteSpan(span *opentracing.Span) *api.TraceContext {
if span == nil {
log.Printf("Tracer :: WriteSpan :: Error writing trace span nil")
return nil
}
traceContext := make(api.TraceContext)
carrier := opentracing.TextMapCarrier(traceContext)
opentracing.GlobalTracer().Inject((*span).Context(), opentracing.TextMap, carrier)
return &traceContext
}
func TagSpanAsError(span *opentracing.Span, errorMessage, errorStack string) {
if span != nil {
ext.Error.Set(*span, true)
// log more details about the error
var fields []otlog.Field
if len(errorMessage) != 0 {
fields = append(fields, otlog.String("message", errorMessage)) // human readable error message
}
if len(errorStack) != 0 {
fields = append(fields, otlog.String("stack", errorStack)) // error stacktrace
}
(*span).LogFields(fields...)
}
}
func TagSpanWithHttpStatusCode(span *opentracing.Span, statusCode uint16) {
if span != nil {
ext.HTTPStatusCode.Set(*span, statusCode)
}
}
func FinishSpan(span *opentracing.Span) {
if span != nil {
(*span).Finish()
}
}
func SetSpanTags(span *opentracing.Span, tags *map[string]string) {
if span != nil && tags != nil {
for key, value := range *tags {
(*span).SetTag(key, value)
}
}
}