refactor(backend): extract to pkg/cap

pkg/trace/trace_provider.go

@@ -0,0 +1,53 @@
+// Copyright 2025 linux.do
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package trace
+
+import (
+	"context"
+	"os"
+
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
+)
+
+func newTracerProvider(cfg Config) (*sdktrace.TracerProvider, error) {
+	// 获取主机名和容器信息
+	hostname, err := os.Hostname()
+	if err != nil {
+		return nil, err
+	}
+
+	// 初始化 Resource
+	r, err := resource.Merge(
+		resource.Default(),
+		resource.NewWithAttributes(
+			semconv.SchemaURL,
+			semconv.ServiceName(cfg.AppName),
+			semconv.HostName(hostname),
+			semconv.K8SNamespaceName(os.Getenv("KUBERNETES_NAMESPACE")),
+			semconv.K8SPodName(os.Getenv("KUBERNETES_POD_NAME")),
+			semconv.K8SPodUID(os.Getenv("KUBERNETES_POD_UID")),
+		),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	// 初始化 Exporter
+	traceExporter, err := otlptracegrpc.New(context.Background())
+	if err != nil {
+		return nil, err
+	}
+
+	// 初始化 Trace
+	tracerProvider := sdktrace.NewTracerProvider(
+		sdktrace.WithBatcher(traceExporter),
+		sdktrace.WithResource(r),
+		sdktrace.WithSampler(ParentBasedErrorAwareSampler(cfg.SamplingRate)),
+	)
+	return tracerProvider, nil
+}