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package detect
import (
"context"
"os"
"sort"
"strconv"
"github.com/pkg/errors"
sdkmetric "go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
type ExporterDetector interface {
DetectTraceExporter() (sdktrace.SpanExporter, error)
DetectMetricExporter() (sdkmetric.Exporter, error)
}
type detector struct {
f ExporterDetector
priority int
}
var detectors map[string]detector
func Register(name string, exp ExporterDetector, priority int) {
if detectors == nil {
detectors = map[string]detector{}
}
detectors[name] = detector{
f: exp,
priority: priority,
}
}
type TraceExporterDetector func() (sdktrace.SpanExporter, error)
func (fn TraceExporterDetector) DetectTraceExporter() (sdktrace.SpanExporter, error) {
return fn()
}
func (fn TraceExporterDetector) DetectMetricExporter() (sdkmetric.Exporter, error) {
return nil, nil
}
func detectExporter[T any](envVar string, fn func(d ExporterDetector) (T, bool, error)) (exp T, err error) {
ignoreErrors, _ := strconv.ParseBool("OTEL_IGNORE_ERROR")
if n := os.Getenv(envVar); n != "" {
d, ok := detectors[n]
if !ok {
if !ignoreErrors {
err = errors.Errorf("unsupported opentelemetry exporter %v", n)
}
return exp, err
}
exp, _, err = fn(d.f)
if err != nil && ignoreErrors {
err = nil
}
return exp, err
}
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
})
var ok bool
for _, d := range arr {
exp, ok, err = fn(d.f)
if err != nil && !ignoreErrors {
return exp, err
}
if ok {
break
}
}
return exp, nil
}
func NewSpanExporter(_ context.Context) (sdktrace.SpanExporter, error) {
return detectExporter("OTEL_TRACES_EXPORTER", func(d ExporterDetector) (sdktrace.SpanExporter, bool, error) {
exp, err := d.DetectTraceExporter()
return exp, exp != nil, err
})
}
func NewMetricExporter(_ context.Context) (sdkmetric.Exporter, error) {
return detectExporter("OTEL_METRICS_EXPORTER", func(d ExporterDetector) (sdkmetric.Exporter, bool, error) {
exp, err := d.DetectMetricExporter()
return exp, exp != nil, err
})
}
type noneDetector struct{}
func (n noneDetector) DetectTraceExporter() (sdktrace.SpanExporter, error) {
return noneSpanExporter{}, nil
}
func (n noneDetector) DetectMetricExporter() (sdkmetric.Exporter, error) {
return noneMetricExporter{}, nil
}
type noneSpanExporter struct{}
func (n noneSpanExporter) ExportSpans(_ context.Context, _ []sdktrace.ReadOnlySpan) error {
return nil
}
func (n noneSpanExporter) Shutdown(_ context.Context) error {
return nil
}
func IsNoneSpanExporter(exp sdktrace.SpanExporter) bool {
_, ok := exp.(noneSpanExporter)
return ok
}
type noneMetricExporter struct{}
func (n noneMetricExporter) Temporality(kind sdkmetric.InstrumentKind) metricdata.Temporality {
return sdkmetric.DefaultTemporalitySelector(kind)
}
func (n noneMetricExporter) Aggregation(kind sdkmetric.InstrumentKind) sdkmetric.Aggregation {
return sdkmetric.DefaultAggregationSelector(kind)
}
func (n noneMetricExporter) Export(_ context.Context, _ *metricdata.ResourceMetrics) error {
return nil
}
func (n noneMetricExporter) ForceFlush(_ context.Context) error {
return nil
}
func (n noneMetricExporter) Shutdown(_ context.Context) error {
return nil
}
func IsNoneMetricExporter(exp sdkmetric.Exporter) bool {
_, ok := exp.(noneMetricExporter)
return ok
}
func init() {
// Register a none detector. This will never be chosen if there's another suitable
// exporter that can be detected, but exists to allow telemetry to be explicitly
// disabled.
Register("none", noneDetector{}, 1000)
}
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