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detect.go
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detect.go
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package detect
import (
"context"
"os"
"path/filepath"
"sort"
"strconv"
"sync"
"github.com/moby/buildkit/util/bklog"
"github.com/pkg/errors"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
"go.opentelemetry.io/otel/trace"
)
type ExporterDetector func() (sdktrace.SpanExporter, error)
type detector struct {
f ExporterDetector
priority int
}
var ServiceName string
var Recorder *TraceRecorder
var detectors map[string]detector
var once sync.Once
var tp trace.TracerProvider
var exporter sdktrace.SpanExporter
var closers []func(context.Context) error
var err error
func Register(name string, exp ExporterDetector, priority int) {
if detectors == nil {
detectors = map[string]detector{}
}
detectors[name] = detector{
f: exp,
priority: priority,
}
}
func detectExporter() (sdktrace.SpanExporter, error) {
if n := os.Getenv("OTEL_TRACES_EXPORTER"); n != "" {
d, ok := detectors[n]
if !ok {
if n == "none" {
return nil, nil
}
return nil, errors.Errorf("unsupported opentelemetry tracer %v", n)
}
return d.f()
}
arr := make([]detector, 0, len(detectors))
for _, d := range detectors {
arr = append(arr, d)
}
sort.Slice(arr, func(i, j int) bool {
return arr[i].priority < arr[j].priority
})
for _, d := range arr {
exp, err := d.f()
if err != nil {
return nil, err
}
if exp != nil {
return exp, nil
}
}
return nil, nil
}
func getExporter() (sdktrace.SpanExporter, error) {
exp, err := detectExporter()
if err != nil {
return nil, err
}
if Recorder != nil {
Recorder.SpanExporter = exp
exp = Recorder
}
return exp, nil
}
func detect() error {
tp = trace.NewNoopTracerProvider()
exp, err := getExporter()
if err != nil || exp == nil {
return err
}
// enable log with traceID when valid exporter
bklog.EnableLogWithTraceID(true)
res, err := resource.Detect(context.Background(), serviceNameDetector{})
if err != nil {
return err
}
res, err = resource.Merge(resource.Default(), res)
if err != nil {
return err
}
sp := sdktrace.NewBatchSpanProcessor(exp)
if Recorder != nil {
Recorder.flush = sp.ForceFlush
}
sdktp := sdktrace.NewTracerProvider(sdktrace.WithSpanProcessor(sp), sdktrace.WithResource(res))
closers = append(closers, sdktp.Shutdown)
exporter = exp
tp = sdktp
return nil
}
func TracerProvider() (trace.TracerProvider, error) {
once.Do(func() {
if err1 := detect(); err1 != nil {
err = err1
}
})
b, _ := strconv.ParseBool(os.Getenv("OTEL_IGNORE_ERROR"))
if err != nil && !b {
return nil, err
}
return tp, nil
}
func Exporter() (sdktrace.SpanExporter, error) {
_, err := TracerProvider()
if err != nil {
return nil, err
}
return exporter, nil
}
func Shutdown(ctx context.Context) error {
for _, c := range closers {
if err := c(ctx); err != nil {
return err
}
}
return nil
}
type serviceNameDetector struct{}
func (serviceNameDetector) Detect(ctx context.Context) (*resource.Resource, error) {
return resource.StringDetector(
semconv.SchemaURL,
semconv.ServiceNameKey,
func() (string, error) {
if n := os.Getenv("OTEL_SERVICE_NAME"); n != "" {
return n, nil
}
if ServiceName != "" {
return ServiceName, nil
}
return filepath.Base(os.Args[0]), nil
},
).Detect(ctx)
}