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trace.go
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trace.go
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package observability
import (
"context"
"errors"
"log/slog"
"os"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
tracesdk "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
func (t *Telemetry) initTrace() error {
res, err := t.newResource(t.ctx)
if err != nil {
return err
}
if t.tracesEnabled {
t.log.Debug("Traces enabled", slog.String("exporter", t.tracesExporter))
switch t.tracesExporter {
case "grpc":
t.log.Debug("GRPC exporter", slog.String("url", t.otelExporterUrl))
conn, err := grpc.DialContext(t.ctx, t.otelExporterUrl, grpc.WithTransportCredentials(insecure.NewCredentials()), grpc.WithBlock())
if err != nil {
return err
}
t.traceExporter, err = otlptracegrpc.New(t.ctx, otlptracegrpc.WithGRPCConn(conn), otlptracegrpc.WithInsecure(), otlptracegrpc.WithEndpoint(t.otelExporterUrl))
if err != nil {
return err
}
t.log.Info("Initialized OTLP exporter", slog.String("url", t.otelExporterUrl))
case "http":
t.log.Debug("HTTP exporter", slog.String("url", t.otelExporterUrl))
t.traceExporter, err = otlptracehttp.New(t.ctx, otlptracehttp.WithEndpoint(t.otelExporterUrl), otlptracehttp.WithInsecure())
if err != nil {
return err
}
t.log.Info("Initialized OTLP exporter", slog.String("url", t.otelExporterUrl))
default:
f, err := os.Create("traces.log")
if err != nil {
return err
}
t.traceExporter, err = stdouttrace.New(stdouttrace.WithWriter(f))
if err != nil {
return err
}
t.log.Info("Initialized OTLP exporter", slog.String("file", "traces.log"))
}
}
batchSpanProcessor := tracesdk.NewBatchSpanProcessor(t.traceExporter)
tracerProvider := tracesdk.NewTracerProvider(
tracesdk.WithSampler(tracesdk.AlwaysSample()),
tracesdk.WithResource(res),
tracesdk.WithSpanProcessor(batchSpanProcessor),
)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
))
otel.SetTracerProvider(tracerProvider)
t.Tracer = otel.Tracer(t.serviceName)
if t.Tracer == nil {
return errors.New("failed to initialize telemetry instance: nil tracer")
}
return nil
}
func (t *Telemetry) newResource(ctx context.Context) (*resource.Resource, error) {
return resource.New(ctx,
resource.WithAttributes(
semconv.ServiceName(t.serviceName),
semconv.ServiceVersion(*t.version),
attribute.String("node_pub_key", t.nodePubKey),
attribute.String("application", t.serviceName),
),
)
}