micro-tracer-opentracing/opentracing.go

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package opentracing
import (
"context"
"errors"
"fmt"
ot "github.com/opentracing/opentracing-go"
otlog "github.com/opentracing/opentracing-go/log"
"go.unistack.org/micro/v4/metadata"
"go.unistack.org/micro/v4/options"
"go.unistack.org/micro/v4/tracer"
)
var _ tracer.Tracer = &otTracer{}
type otTracer struct {
opts tracer.Options
tracer ot.Tracer
}
func (t *otTracer) Name() string {
return t.opts.Name
}
func (t *otTracer) Flush(ctx context.Context) error {
return nil
}
func (t *otTracer) Init(opts ...options.Option) error {
for _, o := range opts {
o(&t.opts)
}
if tr, ok := t.opts.Context.Value(tracerKey{}).(ot.Tracer); ok {
t.tracer = tr
} else {
return errors.New("Tracer option missing")
}
return nil
}
func (t *otTracer) Start(ctx context.Context, name string, opts ...options.Option) (context.Context, tracer.Span) {
options := tracer.NewSpanOptions(opts...)
var span ot.Span
switch options.Kind {
case tracer.SpanKindUnspecified:
ctx, span = t.startSpanFromAny(ctx, name)
case tracer.SpanKindInternal:
ctx, span = t.startSpanFromContext(ctx, name)
case tracer.SpanKindClient, tracer.SpanKindProducer:
ctx, span = t.startSpanFromOutgoingContext(ctx, name)
case tracer.SpanKindServer, tracer.SpanKindConsumer:
ctx, span = t.startSpanFromIncomingContext(ctx, name)
}
sp := &otSpan{span: span, opts: options}
return tracer.NewSpanContext(ctx, sp), sp
}
type otSpan struct {
span ot.Span
opts tracer.SpanOptions
status tracer.SpanStatus
statusMsg string
}
func (os *otSpan) SetStatus(st tracer.SpanStatus, msg string) {
os.status = st
os.statusMsg = msg
}
func (os *otSpan) Status() (tracer.SpanStatus, string) {
return os.status, os.statusMsg
}
func (os *otSpan) Tracer() tracer.Tracer {
return &otTracer{tracer: os.span.Tracer()}
}
func (os *otSpan) Finish(opts ...options.Option) {
if len(os.opts.Labels)%2 != 0 {
os.opts.Labels = os.opts.Labels[:len(os.opts.Labels)-1]
}
for idx := 0; idx < len(os.opts.Labels); idx += 2 {
switch os.opts.Labels[idx] {
case "err":
os.status = tracer.SpanStatusError
os.statusMsg = fmt.Sprintf("%v", os.opts.Labels[idx+1])
case "error":
continue
case "X-Request-Id", "x-request-id":
os.span.SetTag("x-request-id", os.opts.Labels[idx+1])
case "rpc.call", "rpc.call_type", "rpc.flavor", "span.kind", "sdk.database", "db.statement", "db.args", "args", "db.query", "query", "method":
os.span.SetTag(fmt.Sprintf("%v", os.opts.Labels[idx]), fmt.Sprintf("%v", os.opts.Labels[idx+1]))
default:
os.span.LogKV(os.opts.Labels[idx], os.opts.Labels[idx+1])
}
}
if os.status == tracer.SpanStatusError {
os.span.SetTag("error", true)
os.span.LogKV("error", os.statusMsg)
}
os.span.Finish()
}
func (os *otSpan) AddEvent(name string, opts ...options.Option) {
os.span.LogFields(otlog.Event(name))
}
func (os *otSpan) Context() context.Context {
return ot.ContextWithSpan(context.Background(), os.span)
}
func (os *otSpan) SetName(name string) {
os.span = os.span.SetOperationName(name)
}
func (os *otSpan) SetLabels(labels ...interface{}) {
os.opts.Labels = labels
}
func (os *otSpan) Kind() tracer.SpanKind {
return os.opts.Kind
}
func (os *otSpan) AddLabels(labels ...interface{}) {
os.opts.Labels = append(os.opts.Labels, labels...)
}
func NewTracer(opts ...options.Option) *otTracer {
options := tracer.NewOptions(opts...)
return &otTracer{opts: options}
}
func spanFromContext(ctx context.Context) ot.Span {
return ot.SpanFromContext(ctx)
}
func (t *otTracer) startSpanFromAny(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
return t.startSpanFromContext(ctx, name, opts...)
}
if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
return t.startSpanFromContext(ctx, name, opts...)
}
if md, ok := metadata.FromIncomingContext(ctx); ok && md != nil {
return t.startSpanFromIncomingContext(ctx, name, opts...)
}
if md, ok := metadata.FromOutgoingContext(ctx); ok && md != nil {
return t.startSpanFromOutgoingContext(ctx, name, opts...)
}
return t.startSpanFromContext(ctx, name, opts...)
}
func (t *otTracer) startSpanFromContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
var parentSpan ot.Span
if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
if sp, ok := tracerSpan.(*otSpan); ok {
parentSpan = sp.span
}
}
if parentSpan == nil {
if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
parentSpan = otSpan
}
}
if parentSpan != nil {
opts = append(opts, ot.ChildOf(parentSpan.Context()))
}
md := metadata.New(1)
sp := t.tracer.StartSpan(name, opts...)
if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(md)); err != nil {
return nil, nil
}
ctx = ot.ContextWithSpan(ctx, sp)
return ctx, sp
}
func (t *otTracer) startSpanFromOutgoingContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
var parentSpan ot.Span
if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
if sp, ok := tracerSpan.(*otSpan); ok {
parentSpan = sp.span
}
}
if parentSpan == nil {
if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
parentSpan = otSpan
}
}
md, ok := metadata.FromOutgoingContext(ctx)
if parentSpan != nil {
opts = append(opts, ot.ChildOf(parentSpan.Context()))
} else {
var parentCtx ot.SpanContext
if ok && md != nil {
if spanCtx, err := t.tracer.Extract(ot.TextMap, ot.TextMapCarrier(md)); err == nil && ok {
parentCtx = spanCtx
}
}
if parentCtx != nil {
opts = append(opts, ot.ChildOf(parentCtx))
}
}
nmd := metadata.Copy(md)
sp := t.tracer.StartSpan(name, opts...)
if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(nmd)); err != nil {
return nil, nil
}
ctx = metadata.NewOutgoingContext(ot.ContextWithSpan(ctx, sp), nmd)
return ctx, sp
}
func (t *otTracer) startSpanFromIncomingContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
var parentSpan ot.Span
if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
if sp, ok := tracerSpan.(*otSpan); ok {
parentSpan = sp.span
}
}
if parentSpan == nil {
if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
parentSpan = otSpan
}
}
md, ok := metadata.FromIncomingContext(ctx)
if parentSpan != nil {
opts = append(opts, ot.ChildOf(parentSpan.Context()))
} else {
var parentCtx ot.SpanContext
if ok && md != nil {
if spanCtx, err := t.tracer.Extract(ot.TextMap, ot.TextMapCarrier(md)); err == nil {
parentCtx = spanCtx
}
}
if parentCtx != nil {
opts = append(opts, ot.ChildOf(parentCtx))
}
}
nmd := metadata.Copy(md)
sp := t.tracer.StartSpan(name, opts...)
if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(nmd)); err != nil {
return nil, nil
}
ctx = metadata.NewIncomingContext(ot.ContextWithSpan(ctx, sp), nmd)
return ctx, sp
}