1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"log"
"net/http"
"github.com/labstack/echo/v4"
"go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/propagation"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
oteltrace "go.opentelemetry.io/otel/trace"
)
var tracer = otel.Tracer("echo-server")
func main() {
tp, err := initTracer()
if err != nil {
log.Fatal(err)
}
defer func() {
if err := tp.Shutdown(context.Background()); err != nil {
log.Printf("Error shutting down tracer provider: %v", err)
}
}()
r := echo.New()
r.Use(otelecho.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() (*sdktrace.TracerProvider, error) {
exporter, err := stdout.New(stdout.WithPrettyPrint())
if err != nil {
return nil, err
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
)
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
return tp, nil
}
func getUser(ctx context.Context, id string) string {
_, span := tracer.Start(ctx, "getUser", oteltrace.WithAttributes(attribute.String("id", id)))
defer span.End()
if id == "123" {
return "otelecho tester"
}
return "unknown"
}
|
