/
tracing.go
81 lines (72 loc) · 2.11 KB
/
tracing.go
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package main
import (
"context"
"fmt"
"net/http"
"os"
"runtime/debug"
"strings"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
"go.opentelemetry.io/otel/trace"
)
func tagHTTPRequestHeader(h string) string { return "http.request.header." + h }
func tagHTTPResponseHeader(h string) string { return "http.response.header." + h }
func tagsFromRequest(span trace.Span, r *http.Request) {
if r == nil {
return
}
hdrLabels := make([]attribute.KeyValue, len(r.Header))
i := 0
for k, h := range r.Header {
hdrLabels[i] = attribute.String(tagHTTPRequestHeader(k), strings.Join(h, "\n"))
i++
}
span.SetAttributes(hdrLabels...)
span.SetAttributes(semconv.HTTPClientAttributesFromHTTPRequest(r)...)
}
func tagsFromResponse(span trace.Span, r *http.Response) {
if r == nil {
return
}
hdrLabels := make([]attribute.KeyValue, len(r.Header))
i := 0
for k, h := range r.Header {
hdrLabels[i] = attribute.String(tagHTTPResponseHeader(k), strings.Join(h, "\n"))
i++
}
span.SetAttributes(hdrLabels...)
span.SetAttributes(semconv.HTTPResponseContentLengthKey.Int64(r.ContentLength))
span.SetAttributes(semconv.HTTPAttributesFromHTTPStatusCode(r.StatusCode)...)
}
func initTracer(ctx context.Context, exporter sdktrace.SpanExporter) error {
hostname, err := os.Hostname()
if err != nil {
return fmt.Errorf("failed to lookup hostname: %w", err)
}
version := "unknown"
module := "unknown"
if bi, ok := debug.ReadBuildInfo(); ok {
version = bi.Main.Version
module = bi.Main.Path
// sum = bi.Main.Sum
}
res, err := resource.New(ctx, resource.WithAttributes(
semconv.ServiceNameKey.String("wnp-bridge"),
semconv.ServiceInstanceIDKey.String(hostname),
attribute.String("module.path", module),
semconv.ServiceVersionKey.String(version),
))
if err != nil {
return fmt.Errorf("failed to create resource: %w", err)
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(res),
)
otel.SetTracerProvider(tp)
return nil
}