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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"database/sql"
"fmt"
"os"
"time"
"github.com/newrelic/go-agent"
_ "github.com/newrelic/go-agent/_integrations/nrmysql"
)
func mustGetEnv(key string) string {
if val := os.Getenv(key); "" != val {
return val
}
panic(fmt.Sprintf("environment variable %s unset", key))
}
func main() {
// Set up a local mysql docker container with:
// docker run -it -p 3306:3306 --net "bridge" -e MYSQL_ALLOW_EMPTY_PASSWORD=true mysql
db, err := sql.Open("nrmysql", "root@/information_schema")
if nil != err {
panic(err)
}
cfg := newrelic.NewConfig("MySQL App", mustGetEnv("NEW_RELIC_LICENSE_KEY"))
cfg.Logger = newrelic.NewDebugLogger(os.Stdout)
app, err := newrelic.NewApplication(cfg)
if nil != err {
panic(err)
}
app.WaitForConnection(5 * time.Second)
txn := app.StartTransaction("mysqlQuery", nil, nil)
ctx := newrelic.NewContext(context.Background(), txn)
row := db.QueryRowContext(ctx, "SELECT count(*) from tables")
var count int
row.Scan(&count)
txn.End()
app.Shutdown(5 * time.Second)
fmt.Println("number of tables in information_schema", count)
}
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