/
basic.go
84 lines (74 loc) · 1.92 KB
/
basic.go
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package basic
import (
"fmt"
"strconv"
"strings"
"time"
basic "github.com/opentracing/basictracer-go"
opentracing "github.com/opentracing/opentracing-go"
)
func InitTracer(opts []string) (opentracing.Tracer, error) {
fmt.Printf("DO NOT USE IN PRODUCTION\n")
var dropAllLogs bool
var sampleModulo uint64 = 1
var maxLogsPerSpan int64 = 0
var recorder basic.SpanRecorder = basic.NewInMemoryRecorder()
var err error
for _, o := range opts {
parts := strings.SplitN(o, "=", 2)
switch parts[0] {
case "drop-all-logs":
dropAllLogs = true
case "sample-modulo":
if len(parts) == 1 {
return nil, missingArg(parts[0])
}
sampleModulo, err = strconv.ParseUint(parts[1], 10, 64)
if err != nil {
return nil, invalidArg(parts[0], err)
}
case "max-logs-per-span":
if len(parts) == 1 {
return nil, missingArg(parts[0])
}
maxLogsPerSpan, err = strconv.ParseInt(parts[1], 10, 64)
if err != nil {
return nil, invalidArg(parts[0], err)
}
case "recorder":
if len(parts) == 1 {
return nil, missingArg(parts[0])
}
switch parts[1] {
case "in-memory":
recorder = basic.NewInMemoryRecorder()
default:
return nil, fmt.Errorf("invalid recorder parameter")
}
}
}
go func() {
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)
}
time.Sleep(1 * time.Second)
}
}()
return basic.NewWithOptions(basic.Options{
DropAllLogs: dropAllLogs,
ShouldSample: func(traceID uint64) bool { return traceID%sampleModulo == 0 },
MaxLogsPerSpan: int(maxLogsPerSpan),
Recorder: recorder,
}), 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)
}