mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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0425c09c31
* Add dice example * Add manual instrumentation * Update changelog * Add comments * Use naked return consistently * Move handleFunc to main * refactor: Extract newHTTPHandler * Fix comment * Improve comments * Update example/dice/otel.go Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com> * Simplify BaseContext * Update doc.go * Update example/dice/main.go Co-authored-by: Phillip Carter <pcarter@fastmail.com> * Rename span and metric names --------- Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com> Co-authored-by: Phillip Carter <pcarter@fastmail.com>
60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"io"
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"log"
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"math/rand"
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"net/http"
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"strconv"
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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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var (
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tracer = otel.Tracer("rolldice")
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meter = otel.Meter("rolldice")
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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)
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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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log.Printf("Write failed: %v\n", err)
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}
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}
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