285 lines
7.4 KiB
Go
285 lines
7.4 KiB
Go
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package otel
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/baggage"
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"go.opentelemetry.io/otel/codes"
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"go.opentelemetry.io/otel/propagation"
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tracesdk "go.opentelemetry.io/otel/sdk/trace"
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"go.opentelemetry.io/otel/trace"
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"go.unistack.org/micro/v4/metadata"
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"go.unistack.org/micro/v4/tracer"
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)
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var _ tracer.Tracer = (*otelTracer)(nil)
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type otelTracer struct {
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opts tracer.Options
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tracep *tracesdk.TracerProvider
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tracer trace.Tracer
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propagator propagation.TextMapPropagator
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}
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type otelSpan struct {
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ctx context.Context
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tracer trace.Tracer
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tracep *tracesdk.TracerProvider
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span trace.Span
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opts tracer.SpanOptions
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status tracer.SpanStatus
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statusMsg string
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}
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func (ot *otelTracer) Name() string {
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return ot.opts.Name
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}
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func (ot *otelTracer) Flush(ctx context.Context) error {
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return ot.tracep.ForceFlush(ctx)
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}
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func (ot *otelTracer) Init(opts ...tracer.Option) error {
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for _, o := range opts {
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o(&ot.opts)
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}
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var to []trace.TracerOption
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if o, ok := ot.opts.Context.Value(tracerOptionsKey{}).([]trace.TracerOption); ok {
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to = o
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}
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var tp *tracesdk.TracerProvider
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if p, ok := ot.opts.Context.Value(providerKey{}).(*tracesdk.TracerProvider); ok {
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tp = p
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}
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if o, ok := ot.opts.Context.Value(providerOptionsKey{}).([]tracesdk.TracerProviderOption); ok {
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tp = tracesdk.NewTracerProvider(o...)
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}
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if tp == nil {
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return fmt.Errorf("missing Provider or ProviderOptions option")
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}
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ot.tracep = tp
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ot.tracer = tp.Tracer(ot.opts.Name, to...)
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ot.propagator = propagation.NewCompositeTextMapPropagator(
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propagation.Baggage{},
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propagation.TraceContext{},
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)
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return nil
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}
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func (ot *otelTracer) 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 trace.Span
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switch options.Kind {
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case tracer.SpanKindInternal, tracer.SpanKindUnspecified:
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ctx, span = ot.startSpanFromContext(ctx, name)
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case tracer.SpanKindClient, tracer.SpanKindProducer:
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ctx, span = ot.startSpanFromOutgoingContext(ctx, name)
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case tracer.SpanKindServer, tracer.SpanKindConsumer:
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ctx, span = ot.startSpanFromIncomingContext(ctx, name)
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}
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return ctx, &otelSpan{ctx: ctx, tracep: ot.tracep, tracer: ot.tracer, span: span, opts: options}
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}
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func (os *otelSpan) SetStatus(st tracer.SpanStatus, msg string) {
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switch st {
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case tracer.SpanStatusError:
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os.span.SetStatus(codes.Error, msg)
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os.span.RecordError(errors.New(msg))
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case tracer.SpanStatusOK:
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os.span.SetStatus(codes.Ok, msg)
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case tracer.SpanStatusUnset:
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os.span.SetStatus(codes.Unset, msg)
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}
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os.status = st
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os.statusMsg = msg
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}
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func (os *otelSpan) Status() (tracer.SpanStatus, string) {
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return os.status, os.statusMsg
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}
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func (os *otelSpan) Tracer() tracer.Tracer {
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return &otelTracer{tracep: os.tracep, tracer: os.tracer}
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}
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func (os *otelSpan) Finish(opts ...tracer.SpanOption) {
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if len(os.opts.Labels) > 0 {
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os.span.SetAttributes(convertLabels(os.opts.Labels...)...)
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}
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os.span.End()
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}
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func (os *otelSpan) AddEvent(name string, opts ...tracer.EventOption) {
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os.span.AddEvent(name)
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}
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func (os *otelSpan) Context() context.Context {
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return trace.ContextWithSpan(os.ctx, os.span)
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}
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func (os *otelSpan) SetName(name string) {
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os.span.SetName(name)
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}
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func (os *otelSpan) SetLabels(labels ...interface{}) {
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os.opts.Labels = labels
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}
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func (os *otelSpan) Kind() tracer.SpanKind {
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return os.opts.Kind
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}
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func (os *otelSpan) AddLabels(labels ...interface{}) {
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os.opts.Labels = append(os.opts.Labels, labels...)
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}
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func NewTracer(opts ...tracer.Option) *otelTracer {
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options := tracer.NewOptions(opts...)
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return &otelTracer{opts: options}
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}
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func (ot *otelTracer) startSpanFromContext(ctx context.Context, name string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
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md, ok := metadata.FromContext(ctx)
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if !ok {
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md = metadata.New(1)
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}
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mc := make(propagation.MapCarrier)
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for k, v := range md {
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for _, f := range ot.propagator.Fields() {
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if strings.EqualFold(k, f) {
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mc[f] = v
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}
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}
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}
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ctx = ot.propagator.Extract(ctx, mc)
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spanCtx := trace.SpanContextFromContext(ctx)
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ctx = baggage.ContextWithBaggage(ctx, baggage.FromContext(ctx))
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var span trace.Span
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ctx, span = ot.tracer.Start(trace.ContextWithRemoteSpanContext(ctx, spanCtx), name, opts...)
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mc = make(propagation.MapCarrier)
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ot.propagator.Inject(ctx, mc)
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for k, v := range mc {
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md.Set(k, v)
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}
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ctx = metadata.NewContext(ctx, md)
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return ctx, span
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}
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func (ot *otelTracer) startSpanFromOutgoingContext(ctx context.Context, name string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
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md, ok := metadata.FromOutgoingContext(ctx)
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if !ok {
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md = metadata.New(1)
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}
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mc := make(propagation.MapCarrier)
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for k, v := range md {
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for _, f := range ot.propagator.Fields() {
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if strings.EqualFold(k, f) {
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mc[f] = v
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}
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}
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}
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ctx = ot.propagator.Extract(ctx, mc)
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spanCtx := trace.SpanContextFromContext(ctx)
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ctx = baggage.ContextWithBaggage(ctx, baggage.FromContext(ctx))
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var span trace.Span
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ctx, span = ot.tracer.Start(trace.ContextWithRemoteSpanContext(ctx, spanCtx), name, opts...)
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mc = make(propagation.MapCarrier)
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ot.propagator.Inject(ctx, mc)
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for k, v := range mc {
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md.Set(k, v)
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}
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ctx = metadata.NewOutgoingContext(ctx, md)
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return ctx, span
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}
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func (ot *otelTracer) startSpanFromIncomingContext(ctx context.Context, name string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
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md, ok := metadata.FromIncomingContext(ctx)
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if !ok {
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md = metadata.New(1)
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}
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mc := make(propagation.MapCarrier)
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for k, v := range md {
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for _, f := range ot.propagator.Fields() {
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if strings.EqualFold(k, f) {
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mc[f] = v
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}
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}
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}
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ctx = ot.propagator.Extract(ctx, mc)
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spanCtx := trace.SpanContextFromContext(ctx)
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ctx = baggage.ContextWithBaggage(ctx, baggage.FromContext(ctx))
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var span trace.Span
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ctx, span = ot.tracer.Start(trace.ContextWithRemoteSpanContext(ctx, spanCtx), name, opts...)
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mc = make(propagation.MapCarrier)
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ot.propagator.Inject(ctx, mc)
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for k, v := range mc {
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md.Set(k, v)
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}
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ctx = metadata.NewIncomingContext(ctx, md)
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return ctx, span
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}
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func convertLabels(labels ...interface{}) []attribute.KeyValue {
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kv := make([]attribute.KeyValue, 0, len(labels)/2)
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for idx := 0; idx < len(labels)/2; idx += 2 {
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if v, ok := labels[idx].(attribute.KeyValue); ok {
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kv = append(kv, v)
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}
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switch v := labels[idx+1].(type) {
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case attribute.KeyValue:
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kv = append(kv, v)
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case bool:
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kv = append(kv, attribute.Bool(labels[idx].(string), v))
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case []bool:
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kv = append(kv, attribute.BoolSlice(labels[idx].(string), v))
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case float64:
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kv = append(kv, attribute.Float64(labels[idx].(string), v))
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case []float64:
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kv = append(kv, attribute.Float64Slice(labels[idx].(string), v))
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case int:
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kv = append(kv, attribute.Int(labels[idx].(string), v))
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case []int:
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kv = append(kv, attribute.IntSlice(labels[idx].(string), v))
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case int64:
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kv = append(kv, attribute.Int64(labels[idx].(string), v))
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case []int64:
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kv = append(kv, attribute.Int64Slice(labels[idx].(string), v))
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case string:
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kv = append(kv, attribute.String(labels[idx].(string), v))
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case []string:
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kv = append(kv, attribute.StringSlice(labels[idx].(string), v))
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case fmt.Stringer:
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kv = append(kv, attribute.Stringer(labels[idx].(string), v))
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default:
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kv = append(kv, attribute.String(labels[idx].(string), fmt.Sprintf("%v", v)))
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}
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}
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return kv
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}
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