micro/tracer/trace.go

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// Package tracer provides an interface for distributed tracing
package tracer
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import (
"context"
"time"
)
var (
// DefaultTracer is the global default tracer
DefaultTracer Tracer = NewTracer()
)
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// Tracer is an interface for distributed tracing
type Tracer interface {
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// Start a trace
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Start(ctx context.Context, name string) (context.Context, *Span)
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// Finish the trace
Finish(*Span) error
// Read the traces
Read(...ReadOption) ([]*Span, error)
}
// SpanType describe the nature of the trace span
type SpanType int
const (
// SpanTypeRequestInbound is a span created when serving a request
SpanTypeRequestInbound SpanType = iota
// SpanTypeRequestOutbound is a span created when making a service call
SpanTypeRequestOutbound
)
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// Span is used to record an entry
type Span struct {
// Id of the trace
Trace string
// name of the span
Name string
// id of the span
Id string
// parent span id
Parent string
// Start time
Started time.Time
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// Duration in nano seconds
Duration time.Duration
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// associated data
Metadata map[string]string
// Type
Type SpanType
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}