79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"context"
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"log"
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"net/http"
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"github.com/labstack/echo/v4"
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echotrace "go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo"
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otelglobal "go.opentelemetry.io/otel/api/global"
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"go.opentelemetry.io/otel/api/kv"
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oteltrace "go.opentelemetry.io/otel/api/trace"
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"go.opentelemetry.io/otel/exporters/stdout"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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)
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var tracer = otelglobal.Tracer("gin-server")
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func main() {
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initTracer()
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r := echo.New()
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r.Use(echotrace.Middleware("my-server"))
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r.GET("/users/:id", func(c echo.Context) error {
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id := c.Param("id")
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name := getUser(c.Request().Context(), id)
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return c.JSON(http.StatusOK, struct {
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ID string
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Name string
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}{
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ID: id,
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Name: name,
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})
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})
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_ = r.Start(":8080")
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}
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func initTracer() {
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exporter, err := stdout.NewExporter(stdout.WithPrettyPrint())
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if err != nil {
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log.Fatal(err)
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}
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cfg := sdktrace.Config{
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DefaultSampler: sdktrace.AlwaysSample(),
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}
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tp, err := sdktrace.NewProvider(
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sdktrace.WithConfig(cfg),
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sdktrace.WithSyncer(exporter),
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)
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if err != nil {
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log.Fatal(err)
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}
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otelglobal.SetTraceProvider(tp)
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}
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func getUser(ctx context.Context, id string) string {
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_, span := tracer.Start(ctx, "getUser", oteltrace.WithAttributes(kv.String("id", id)))
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defer span.End()
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if id == "123" {
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return "echotrace tester"
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}
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return "unknown"
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}
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