64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package main
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import (
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"fmt"
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"io"
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"log/slog"
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"math/rand"
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"net/http"
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"os"
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"strconv"
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// TODO: https://github.com/open-telemetry/opentelemetry-go/issues/5801
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// "go.opentelemetry.io/contrib/bridges/otelslog".
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/metric"
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)
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const name = "go.opentelemetry.io/contrib/examples/dice"
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var (
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tracer = otel.Tracer(name)
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meter = otel.Meter(name)
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logger = slog.New(slog.NewJSONHandler(os.Stdout, nil)) // TODO: logger = otelslog.NewLogger(name).
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rollCnt metric.Int64Counter
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)
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func init() {
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var err error
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rollCnt, err = meter.Int64Counter("dice.rolls",
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metric.WithDescription("The number of rolls by roll value"),
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metric.WithUnit("{roll}"))
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if err != nil {
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panic(err)
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}
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}
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func rolldice(w http.ResponseWriter, r *http.Request) {
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ctx, span := tracer.Start(r.Context(), "roll")
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defer span.End()
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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.
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var msg string
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if player := r.PathValue("player"); player != "" {
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msg = fmt.Sprintf("%s is rolling the dice", player)
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} else {
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msg = "Anonymous player is rolling the dice"
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}
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logger.InfoContext(ctx, msg, "result", roll)
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rollValueAttr := attribute.Int("roll.value", roll)
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span.SetAttributes(rollValueAttr)
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rollCnt.Add(ctx, 1, metric.WithAttributes(rollValueAttr))
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resp := strconv.Itoa(roll) + "\n"
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if _, err := io.WriteString(w, resp); err != nil {
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logger.ErrorContext(ctx, "Write failed", "error", err)
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}
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}
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