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basic.go
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basic.go
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package basic
import (
"fmt"
"strconv"
"strings"
"sync"
"time"
basic "github.com/opentracing/basictracer-go"
opentracing "github.com/opentracing/opentracing-go"
)
type CloseableTracer interface {
opentracing.Tracer
Close()
}
type basicTracer struct {
opentracing.Tracer
quit chan struct{}
once sync.Once
}
func InitTracer(opts []string) (CloseableTracer, error) {
fmt.Printf("DO NOT USE IN PRODUCTION\n")
var (
dropAllLogs bool
sampleModulo uint64 = 1
maxLogsPerSpan = 0
recorder basic.SpanRecorder = basic.NewInMemoryRecorder()
err error
)
for _, o := range opts {
k, v, _ := strings.Cut(o, "=")
switch k {
case "drop-all-logs":
dropAllLogs = true
case "sample-modulo":
if v == "" {
return nil, missingArg(k)
}
sampleModulo, err = strconv.ParseUint(v, 10, 64)
if err != nil {
return nil, invalidArg(k, err)
}
case "max-logs-per-span":
if v == "" {
return nil, missingArg(k)
}
maxLogsPerSpan, err = strconv.Atoi(v)
if err != nil {
return nil, invalidArg(k, err)
}
case "recorder":
if v == "" {
return nil, missingArg(k)
}
switch v {
case "in-memory":
recorder = basic.NewInMemoryRecorder()
default:
return nil, fmt.Errorf("invalid recorder parameter")
}
}
}
quit := make(chan struct{})
bt := &basicTracer{
basic.NewWithOptions(basic.Options{
DropAllLogs: dropAllLogs,
ShouldSample: func(traceID uint64) bool { return traceID%sampleModulo == 0 },
MaxLogsPerSpan: maxLogsPerSpan,
Recorder: recorder,
}),
quit,
sync.Once{},
}
go func() {
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
for {
rec := recorder.(*basic.InMemorySpanRecorder)
spans := rec.GetSampledSpans()
// Argh! we cannot lock it...
rec.Reset()
for _, span := range spans {
fmt.Printf("SAMPLED=%#v\n", span)
}
select {
case <-ticker.C:
case <-quit:
return
}
}
}()
return bt, nil
}
func missingArg(opt string) error {
return fmt.Errorf("missing argument for %s option", opt)
}
func invalidArg(opt string, err error) error {
return fmt.Errorf("invalid argument for %s option: %s", opt, err)
}
func (bt *basicTracer) Close() {
bt.once.Do(func() {
close(bt.quit)
})
}