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server.go
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server.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"log"
"github.com/astaxie/beego"
"go.opentelemetry.io/contrib/instrumentation/github.com/astaxie/beego/otelbeego"
"go.opentelemetry.io/otel"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.10.0"
"go.opentelemetry.io/otel/trace"
)
type ExampleController struct {
beego.Controller
}
func (c *ExampleController) Get() {
ctx := c.Ctx.Request.Context()
span := trace.SpanFromContext(ctx)
span.AddEvent("handling this...")
c.Ctx.WriteString("Hello, world!")
}
func (c *ExampleController) Template() {
c.TplName = "hello.tpl"
// Render the template file with tracing enabled
if err := otelbeego.Render(&c.Controller); err != nil {
c.Abort("500")
}
}
func initTracer() *sdktrace.TracerProvider {
// Create stdout exporter to be able to retrieve
// the collected spans.
exporter, err := stdout.New(stdout.WithPrettyPrint())
if err != nil {
log.Fatal(err)
}
// For the demonstration, use sdktrace.AlwaysSample sampler to sample all traces.
// In a production application, use sdktrace.ProbabilitySampler with a desired probability.
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(resource.NewWithAttributes(semconv.SchemaURL, semconv.ServiceNameKey.String("ExampleService"))))
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
return tp
}
func main() {
tp := initTracer()
defer func() {
if err := tp.Shutdown(context.Background()); err != nil {
log.Printf("Error shutting down tracer provider: %v", err)
}
}()
// To enable tracing on template rendering, disable autorender
beego.BConfig.WebConfig.AutoRender = false
beego.Router("/hello", &ExampleController{})
beego.Router("/", &ExampleController{}, "get:Template")
mware := otelbeego.NewOTelBeegoMiddleWare("beego-example")
beego.RunWithMiddleWares(":7777", mware)
}