micro/tracer/memory.go

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package tracer
import (
"context"
"time"
"github.com/google/uuid"
"github.com/unistack-org/micro/v3/util/ring"
)
type tracer struct {
opts Options
// ring buffer of traces
buffer *ring.Buffer
}
func (t *tracer) Read(opts ...ReadOption) ([]*Span, error) {
var options ReadOptions
for _, o := range opts {
o(&options)
}
sp := t.buffer.Get(t.buffer.Size())
spans := make([]*Span, 0, len(sp))
for _, span := range sp {
val := span.Value.(*Span)
// skip if trace id is specified and doesn't match
if len(options.Trace) > 0 && val.Trace != options.Trace {
continue
}
spans = append(spans, val)
}
return spans, nil
}
func (t *tracer) Start(ctx context.Context, name string) (context.Context, *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 NewContext(context.Background(), span.Trace, span.Id), span
}
traceID, parentSpanID, ok := FromContext(ctx)
// If the trace can not be found in the header,
// that means this is where the trace is created.
if !ok {
return NewContext(ctx, span.Trace, span.Id), span
}
// set trace id
span.Trace = traceID
// set parent
span.Parent = parentSpanID
// return the span
return NewContext(ctx, span.Trace, span.Id), span
}
func (t *tracer) Finish(s *Span) error {
// set finished time
s.Duration = time.Since(s.Started)
// save the span
t.buffer.Put(s)
return nil
}
func (t *tracer) Init(opts ...Option) error {
for _, o := range opts {
o(&t.opts)
}
return nil
}
func (t *tracer) Lookup(ctx context.Context) (*Span, error) {
return nil, nil
}
func (t *tracer) Name() string {
return t.opts.Name
}
func NewTracer(opts ...Option) Tracer {
return &tracer{
opts: NewOptions(opts...),
// the last 256 requests
buffer: ring.New(256),
}
}