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wait.go
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wait.go
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package migo
import (
"database/sql"
"fmt"
"time"
"github.com/go-sql-driver/mysql"
"github.com/pkg/errors"
)
const (
timeoutForWait = time.Minute
)
type Logger struct{}
func (l Logger) Print(v ...interface{}) {
// do nothing
}
func Wait(op WaitOption) error {
db, err := NewDB(op.ConfigFile, op.Environment)
if err != nil {
return errors.Wrap(err, "Parse db config")
}
return db.wait()
}
func (db DB) wait() error {
if err := mysql.SetLogger(Logger{}); err != nil {
return errors.Wrap(err, "Can't set logger")
}
mysql, err := sql.Open("mysql", db.FormatDBUnspecifiedDSN())
if err != nil {
return errors.Wrap(err, "Create mysql connection")
}
defer mysql.Close()
fmt.Printf("Waiting for accepting query ")
startedAt := time.Now()
for {
fmt.Printf(".")
query := fmt.Sprintf("show databases")
if time.Now().Sub(startedAt) > timeoutForWait {
fmt.Printf("\n")
return errors.New("Timeout for waiting")
}
if _, err := mysql.Exec(query); err == nil {
fmt.Printf("\nAccepted\n")
break
}
time.Sleep(time.Second)
}
return nil
}