micro/tracer/noop.go

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package tracer
import (
"context"
"go.unistack.org/micro/v4/options"
)
var _ Tracer = (*noopTracer)(nil)
type noopTracer struct {
opts Options
}
func (t *noopTracer) Start(ctx context.Context, name string, opts ...options.Option) (context.Context, Span) {
span := &noopSpan{
name: name,
ctx: ctx,
tracer: t,
opts: NewSpanOptions(opts...),
}
if span.ctx == nil {
span.ctx = context.Background()
}
return NewSpanContext(ctx, span), span
}
func (t *noopTracer) Flush(ctx context.Context) error {
return nil
}
func (t *noopTracer) Init(opts ...options.Option) error {
for _, o := range opts {
o(&t.opts)
}
return nil
}
func (t *noopTracer) Name() string {
return t.opts.Name
}
type noopSpan struct {
ctx context.Context
tracer Tracer
name string
opts SpanOptions
status SpanStatus
statusMsg string
}
func (s *noopSpan) Finish(opts ...options.Option) {
}
func (s *noopSpan) Context() context.Context {
return s.ctx
}
func (s *noopSpan) Tracer() Tracer {
return s.tracer
}
func (s *noopSpan) AddEvent(name string, opts ...options.Option) {
}
func (s *noopSpan) SetName(name string) {
s.name = name
}
func (s *noopSpan) SetLabels(labels ...interface{}) {
s.opts.Labels = labels
}
func (s *noopSpan) AddLabels(labels ...interface{}) {
s.opts.Labels = append(s.opts.Labels, labels...)
}
func (s *noopSpan) Kind() SpanKind {
return s.opts.Kind
}
func (s *noopSpan) Status() (SpanStatus, string) {
return s.status, s.statusMsg
}
func (s *noopSpan) SetStatus(st SpanStatus, msg string) {
s.status = st
s.statusMsg = msg
}
// NewTracer returns new memory tracer
func NewTracer(opts ...options.Option) Tracer {
return &noopTracer{
opts: NewOptions(opts...),
}
}