/
server.go
78 lines (69 loc) · 1.93 KB
/
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"
"net/http"
"github.com/labstack/echo/v4"
echotrace "go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo"
otelglobal "go.opentelemetry.io/otel/api/global"
oteltrace "go.opentelemetry.io/otel/api/trace"
"go.opentelemetry.io/otel/exporters/stdout"
"go.opentelemetry.io/otel/label"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
var tracer = otelglobal.Tracer("gin-server")
func main() {
initTracer()
r := echo.New()
r.Use(echotrace.Middleware("my-server"))
r.GET("/users/:id", func(c echo.Context) error {
id := c.Param("id")
name := getUser(c.Request().Context(), id)
return c.JSON(http.StatusOK, struct {
ID string
Name string
}{
ID: id,
Name: name,
})
})
_ = r.Start(":8080")
}
func initTracer() {
exporter, err := stdout.NewExporter(stdout.WithPrettyPrint())
if err != nil {
log.Fatal(err)
}
cfg := sdktrace.Config{
DefaultSampler: sdktrace.AlwaysSample(),
}
tp, err := sdktrace.NewProvider(
sdktrace.WithConfig(cfg),
sdktrace.WithSyncer(exporter),
)
if err != nil {
log.Fatal(err)
}
otelglobal.SetTraceProvider(tp)
}
func getUser(ctx context.Context, id string) string {
_, span := tracer.Start(ctx, "getUser", oteltrace.WithAttributes(label.String("id", id)))
defer span.End()
if id == "123" {
return "echotrace tester"
}
return "unknown"
}