315 lines
7.4 KiB
Go
315 lines
7.4 KiB
Go
package opentracing
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import (
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"context"
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"errors"
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"fmt"
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ot "github.com/opentracing/opentracing-go"
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otlog "github.com/opentracing/opentracing-go/log"
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"go.opentelemetry.io/otel/attribute"
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"go.unistack.org/micro/v3/metadata"
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"go.unistack.org/micro/v3/tracer"
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rutil "go.unistack.org/micro/v3/util/reflect"
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)
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var _ tracer.Tracer = &otTracer{}
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type otTracer struct {
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opts tracer.Options
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tracer ot.Tracer
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}
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func (t *otTracer) Name() string {
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return t.opts.Name
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}
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func (t *otTracer) Flush(ctx context.Context) error {
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return nil
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}
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func (t *otTracer) Init(opts ...tracer.Option) error {
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for _, o := range opts {
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o(&t.opts)
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}
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if tr, ok := t.opts.Context.Value(tracerKey{}).(ot.Tracer); ok {
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t.tracer = tr
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} else {
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return errors.New("Tracer option missing")
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}
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return nil
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}
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type spanContext interface {
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TraceID() idStringer
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SpanID() idStringer
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}
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func (t *otTracer) Start(ctx context.Context, name string, opts ...tracer.SpanOption) (context.Context, tracer.Span) {
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options := tracer.NewSpanOptions(opts...)
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var span ot.Span
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switch options.Kind {
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case tracer.SpanKindUnspecified:
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ctx, span = t.startSpanFromAny(ctx, name)
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case tracer.SpanKindInternal:
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ctx, span = t.startSpanFromContext(ctx, name)
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case tracer.SpanKindClient, tracer.SpanKindProducer:
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ctx, span = t.startSpanFromOutgoingContext(ctx, name)
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case tracer.SpanKindServer, tracer.SpanKindConsumer:
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ctx, span = t.startSpanFromIncomingContext(ctx, name)
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}
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sp := &otSpan{span: span, opts: options}
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spctx := span.Context()
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if v, ok := spctx.(spanContext); ok {
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sp.traceID = v.TraceID().String()
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sp.spanID = v.SpanID().String()
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} else {
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if val, err := rutil.StructFieldByName(spctx, "TraceID"); err == nil {
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sp.traceID = fmt.Sprintf("%v", val)
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}
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if val, err := rutil.StructFieldByName(spctx, "SpanID"); err == nil {
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sp.spanID = fmt.Sprintf("%v", val)
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}
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}
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return tracer.NewSpanContext(ctx, sp), sp
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}
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type idStringer struct {
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s string
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}
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func (s idStringer) String() string {
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return s.s
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}
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type otSpan struct {
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span ot.Span
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spanID string
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traceID string
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opts tracer.SpanOptions
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status tracer.SpanStatus
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statusMsg string
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labels []interface{}
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}
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func (os *otSpan) TraceID() string {
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return os.traceID
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}
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func (os *otSpan) SpanID() string {
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return os.spanID
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}
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func (os *otSpan) SetStatus(st tracer.SpanStatus, msg string) {
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os.status = st
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os.statusMsg = msg
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}
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func (os *otSpan) Status() (tracer.SpanStatus, string) {
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return os.status, os.statusMsg
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}
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func (os *otSpan) Tracer() tracer.Tracer {
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return &otTracer{tracer: os.span.Tracer()}
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}
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func (os *otSpan) Finish(opts ...tracer.SpanOption) {
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options := os.opts
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for _, o := range opts {
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o(&options)
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}
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l := len(options.Labels)
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for idx := 0; idx < l; idx++ {
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switch lt := options.Labels[idx].(type) {
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case attribute.KeyValue:
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os.span.SetTag(string(lt.Key), lt.Value.AsInterface())
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case string:
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if l > idx+1 {
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os.span.SetTag(lt, options.Labels[idx+1])
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idx++
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}
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}
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}
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if os.status == tracer.SpanStatusError {
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os.span.SetTag("error", true)
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os.span.LogKV("error", os.statusMsg)
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}
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os.span.SetTag("span.kind", options.Kind)
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os.span.Finish()
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}
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func (os *otSpan) AddEvent(name string, opts ...tracer.EventOption) {
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os.span.LogFields(otlog.Event(name))
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}
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func (os *otSpan) AddLogs(kv ...interface{}) {
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os.span.LogKV(kv...)
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}
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func (os *otSpan) Context() context.Context {
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return ot.ContextWithSpan(context.Background(), os.span)
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}
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func (os *otSpan) SetName(name string) {
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os.span = os.span.SetOperationName(name)
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}
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func (os *otSpan) SetLabels(labels ...interface{}) {
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os.opts.Labels = labels
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}
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func (os *otSpan) Kind() tracer.SpanKind {
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return os.opts.Kind
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}
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func (os *otSpan) AddLabels(labels ...interface{}) {
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os.labels = append(os.labels, labels...)
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}
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func NewTracer(opts ...tracer.Option) *otTracer {
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options := tracer.NewOptions(opts...)
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return &otTracer{opts: options}
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}
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func (t *otTracer) startSpanFromAny(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
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if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
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return t.startSpanFromContext(ctx, name, opts...)
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}
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if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
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return t.startSpanFromContext(ctx, name, opts...)
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}
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if md, ok := metadata.FromIncomingContext(ctx); ok && md != nil {
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return t.startSpanFromIncomingContext(ctx, name, opts...)
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}
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if md, ok := metadata.FromOutgoingContext(ctx); ok && md != nil {
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return t.startSpanFromOutgoingContext(ctx, name, opts...)
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}
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return t.startSpanFromContext(ctx, name, opts...)
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}
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func (t *otTracer) startSpanFromContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
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var parentSpan ot.Span
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if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
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if sp, ok := tracerSpan.(*otSpan); ok {
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parentSpan = sp.span
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}
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}
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if parentSpan == nil {
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if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
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parentSpan = otSpan
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}
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}
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if parentSpan != nil {
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opts = append(opts, ot.ChildOf(parentSpan.Context()))
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}
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md := metadata.New(1)
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sp := t.tracer.StartSpan(name, opts...)
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if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(md)); err != nil {
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return nil, nil
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}
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ctx = ot.ContextWithSpan(ctx, sp)
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return ctx, sp
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}
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func (t *otTracer) startSpanFromOutgoingContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
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var parentSpan ot.Span
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if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
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if sp, ok := tracerSpan.(*otSpan); ok {
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parentSpan = sp.span
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}
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}
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if parentSpan == nil {
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if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
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parentSpan = otSpan
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}
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}
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md, ok := metadata.FromOutgoingContext(ctx)
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if parentSpan != nil {
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opts = append(opts, ot.ChildOf(parentSpan.Context()))
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} else {
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var parentCtx ot.SpanContext
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if ok && md != nil {
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if spanCtx, err := t.tracer.Extract(ot.TextMap, ot.TextMapCarrier(md)); err == nil && ok {
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parentCtx = spanCtx
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}
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}
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if parentCtx != nil {
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opts = append(opts, ot.ChildOf(parentCtx))
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}
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}
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nmd := metadata.Copy(md)
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sp := t.tracer.StartSpan(name, opts...)
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if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(nmd)); err != nil {
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return nil, nil
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}
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ctx = metadata.NewOutgoingContext(ot.ContextWithSpan(ctx, sp), nmd)
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return ctx, sp
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}
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func (t *otTracer) startSpanFromIncomingContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
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var parentSpan ot.Span
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if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
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if sp, ok := tracerSpan.(*otSpan); ok {
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parentSpan = sp.span
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}
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}
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if parentSpan == nil {
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if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
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parentSpan = otSpan
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}
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}
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md, ok := metadata.FromIncomingContext(ctx)
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if parentSpan != nil {
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opts = append(opts, ot.ChildOf(parentSpan.Context()))
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} else {
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var parentCtx ot.SpanContext
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if ok && md != nil {
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if spanCtx, err := t.tracer.Extract(ot.TextMap, ot.TextMapCarrier(md)); err == nil {
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parentCtx = spanCtx
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}
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}
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if parentCtx != nil {
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opts = append(opts, ot.ChildOf(parentCtx))
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}
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}
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nmd := metadata.Copy(md)
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sp := t.tracer.StartSpan(name, opts...)
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if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(nmd)); err != nil {
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return nil, nil
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}
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ctx = metadata.NewIncomingContext(ot.ContextWithSpan(ctx, sp), nmd)
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return ctx, sp
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}
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