/
info.go
41 lines (34 loc) · 878 Bytes
/
info.go
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package main
import (
"encoding/json"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/metric"
"net/http"
)
type InfoResponse struct {
Version string `json:"version"`
ServiceName string `json:"service-name"`
}
var (
tracer = otel.Tracer("info-service")
meter = otel.Meter("info-service")
viewCounter metric.Int64Counter
)
func init() {
var err error
viewCounter, err = meter.Int64Counter("user.views",
metric.WithDescription("The number of views"),
metric.WithUnit("{views}"))
if err != nil {
panic(err)
}
}
func info(w http.ResponseWriter, r *http.Request) {
ctx, span := tracer.Start(r.Context(), "info")
defer span.End()
viewCounter.Add(ctx, 1)
w.Header().Set("Content-Type", "application/json")
response := InfoResponse{Version: "0.1.0", ServiceName: "otlp-sample"}
//nolint:errcheck
json.NewEncoder(w).Encode(response)
}