50 lines
1012 B
Go
50 lines
1012 B
Go
package backends
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import (
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"fmt"
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"time"
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"github.com/jmoiron/sqlx"
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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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)
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// OpenDatabase opens the database and performs a ping to make sure the
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// database is up.
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// Taken from brocaar's lora-app-server: https://github.com/brocaar/lora-app-server
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func OpenDatabase(dsn, engine string, tries int, maxLifeTime int64) (*sqlx.DB, error) {
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db, err := sqlx.Open(engine, dsn)
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if err != nil {
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return nil, errors.Wrap(err, "database connection error")
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}
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if tries == 0 {
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tries = 1
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}
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for tries != 0 {
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if err = db.Ping(); err != nil {
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log.Errorf("ping database %s error, will retry in 2s: %s", engine, err)
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time.Sleep(2 * time.Second)
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} else {
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break
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}
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if tries > 0 {
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tries--
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}
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}
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// Return last ping error when done trying.
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if tries == 0 {
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return nil, fmt.Errorf("couldn't ping database %s: %s", engine, err)
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}
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if maxLifeTime > 0 {
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db.SetConnMaxLifetime(time.Duration(maxLifeTime) * time.Second)
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}
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return db, nil
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}
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