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tracegen.go
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tracegen.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package main
import (
"context"
"fmt"
"math/rand"
"os"
"os/signal"
"github.com/urfave/cli/v3"
"github.com/elastic/apm-tools/pkg/tracegen"
)
func (cmd *Commands) sendTrace(ctx context.Context, c *cli.Command) error {
creds, err := cmd.getCredentials(ctx, c)
if err != nil {
return err
}
cfg := tracegen.NewConfig(
tracegen.WithAPMServerURL(cmd.cfg.APMServerURL),
tracegen.WithAPIKey(creds.APIKey),
tracegen.WithSampleRate(c.Float("sample-rate")),
tracegen.WithInsecureConn(cmd.cfg.TLSSkipVerify),
tracegen.WithOTLPProtocol(c.String("otlp-protocol")),
tracegen.WithOTLPServiceName(newUniqueServiceName("service", "otlp")),
tracegen.WithElasticAPMServiceName(newUniqueServiceName("service", "intake")),
)
ctx, cancel := signal.NotifyContext(context.Background(), os.Kill, os.Interrupt)
defer cancel()
stats, err := tracegen.SendDistributedTrace(ctx, cfg)
if err != nil {
return fmt.Errorf("error sending distributed trace: %w", err)
}
fmt.Printf(
"Sent %d span%s, %d exception%s, and %d log%s\n",
stats.SpansSent, pluralize(stats.SpansSent),
stats.ExceptionsSent, pluralize(stats.ExceptionsSent),
stats.LogsSent, pluralize(stats.LogsSent),
)
return nil
}
func pluralize(n int) string {
if n == 1 {
return ""
}
return "s"
}
func newUniqueServiceName(prefix string, suffix string) string {
uniqueName := suffixString(suffix)
return prefix + "-" + uniqueName
}
func suffixString(s string) string {
const letter = "abcdefghijklmnopqrstuvwxyz"
b := make([]byte, 6)
for i := range b {
b[i] = letter[rand.Intn(len(letter))]
}
return fmt.Sprintf("%s-%s", s, string(b))
}
// NewTraceGenCmd returns pointer to a Command that generates distributed tracing data using go-agent and otel library
func NewTraceGenCmd(commands *Commands) *cli.Command {
return &cli.Command{
Name: "generate-trace",
Usage: "generate distributed tracing data using go-agent and otel library",
Action: commands.sendTrace,
Flags: []cli.Flag{
&cli.FloatFlag{
Name: "sample-rate",
Usage: "set the sample rate. allowed value: min: 0.0001, max: 1.000",
Value: 1.0,
},
&cli.StringFlag{
Name: "otlp-protocol",
Usage: "set OTLP transport protocol to one of: grpc (default), http/protobuf",
Value: "grpc",
},
},
}
}