micro/debug/trace/default.go

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2020-01-18 13:20:46 +03:00
package trace
import (
"context"
"time"
"github.com/google/uuid"
"github.com/micro/go-micro/util/ring"
)
type trace struct {
opts Options
// ring buffer of traces
buffer *ring.Buffer
}
func (t *trace) Read(opts ...ReadOption) ([]*Span, error) {
return []*Span{}, nil
}
func (t *trace) Start(ctx context.Context, name string) *Span {
span := &Span{
Name: name,
Trace: uuid.New().String(),
Id: uuid.New().String(),
Started: time.Now(),
Metadata: make(map[string]string),
}
// return span if no context
if ctx == nil {
return span
}
s, ok := FromContext(ctx)
if !ok {
return span
}
// set trace id
span.Trace = s.Trace
// set parent
span.Parent = s.Id
// return the sapn
return span
}
func (t *trace) Finish(s *Span) error {
// set finished time
s.Finished = time.Now()
// save the span
t.buffer.Put(s)
return nil
}
func NewTrace(opts ...Option) Trace {
var options Options
for _, o := range opts {
o(&options)
}
return &trace{
opts: options,
// the last 64 requests
buffer: ring.New(64),
}
}