micro/tracer/tracer.go

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// Package tracer provides an interface for distributed tracing
package tracer // import "go.unistack.org/micro/v3/tracer"
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import (
"context"
"go.unistack.org/micro/v3/logger"
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)
// DefaultTracer is the global default tracer
var DefaultTracer Tracer = NewTracer()
var (
// TraceIDKey is the key used for the trace id in the log call
TraceIDKey = "trace-id"
// SpanIDKey is the key used for the span id in the log call
SpanIDKey = "span-id"
)
func init() {
logger.DefaultContextAttrFuncs = append(logger.DefaultContextAttrFuncs,
func(ctx context.Context) []interface{} {
if span, ok := SpanFromContext(ctx); ok {
return []interface{}{
TraceIDKey, span.TraceID(),
SpanIDKey, span.SpanID(),
}
}
return nil
})
}
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// Tracer is an interface for distributed tracing
type Tracer interface {
// Name return tracer name
Name() string
// Init tracer with options
Init(...Option) error
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// Start a trace
Start(ctx context.Context, name string, opts ...SpanOption) (context.Context, Span)
// Flush flushes spans
Flush(ctx context.Context) error
}
type Span interface {
// Tracer return underlining tracer
Tracer() Tracer
// Finish complete and send span
Finish(opts ...SpanOption)
// Context return context with span
Context() context.Context
// SetName set the span name
SetName(name string)
// SetStatus set the span status code and msg
SetStatus(status SpanStatus, msg string)
// Status returns span status and msg
Status() (SpanStatus, string)
// AddLabels append labels to span
AddLabels(kv ...interface{})
// AddEvent append event to span
AddEvent(name string, opts ...EventOption)
// AddEvent append event to span
AddLogs(kv ...interface{})
// Kind returns span kind
Kind() SpanKind
// TraceID returns trace id
TraceID() string
// SpanID returns span id
SpanID() string
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}