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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package main
import (
"fmt"
"io"
"math/rand"
"net/http"
"strconv"
"go.opentelemetry.io/contrib/bridges/otelslog"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric"
)
const name = "go.opentelemetry.io/contrib/examples/dice"
var (
tracer = otel.Tracer(name)
meter = otel.Meter(name)
logger = otelslog.NewLogger(name)
rollCnt metric.Int64Counter
)
func init() {
var err error
rollCnt, err = meter.Int64Counter("dice.rolls",
metric.WithDescription("The number of rolls by roll value"),
metric.WithUnit("{roll}"))
if err != nil {
panic(err)
}
}
func rolldice(w http.ResponseWriter, r *http.Request) {
ctx, span := tracer.Start(r.Context(), "roll")
defer span.End()
roll := 1 + rand.Intn(6) //nolint:gosec // G404: Use of weak random number generator (math/rand instead of crypto/rand) is ignored as this is not security-sensitive.
var msg string
if player := r.PathValue("player"); player != "" {
msg = fmt.Sprintf("%s is rolling the dice", player)
} else {
msg = "Anonymous player is rolling the dice"
}
logger.InfoContext(ctx, msg, "result", roll)
rollValueAttr := attribute.Int("roll.value", roll)
span.SetAttributes(rollValueAttr)
rollCnt.Add(ctx, 1, metric.WithAttributes(rollValueAttr))
resp := strconv.Itoa(roll) + "\n"
if _, err := io.WriteString(w, resp); err != nil {
logger.ErrorContext(ctx, "Write failed", "error", err)
}
}
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