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database/sql: add Pinger interface to driver Conn

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Change-Id: If6eb3a7c9ad48a517e584567b1003479c1df6cca
Reviewed-on: https://go-review.googlesource.com/32136
Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
INADA Naoki 2016-10-26 17:11:13 +09:00 • committed by Brad Fitzpatrick
parent 398e861d97
commit 4b90b7a28a
3 changed files with 73 additions and 6 deletions
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24
src/database/sql/sql.go
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@ -553,15 +553,27 @@ func Open(driverName, dataSourceName string) (*DB, error) {
// PingContext verifies a connection to the database is still alive,
// establishing a connection if necessary.
func (db *DB) PingContext(ctx context.Context) error {
// TODO(bradfitz): give drivers an optional hook to implement
// this in a more efficient or more reliable way, if they
// have one.
dc, err := db.conn(ctx, cachedOrNewConn)
var dc *driverConn
var err error
for i := 0; i < maxBadConnRetries; i++ {
dc, err = db.conn(ctx, cachedOrNewConn)
if err != driver.ErrBadConn {
break
}
}
if err == driver.ErrBadConn {
dc, err = db.conn(ctx, alwaysNewConn)
}
if err != nil {
return err
}
db.putConn(dc, nil)
return nil
if pinger, ok := dc.ci.(driver.Pinger); ok {
err = pinger.Ping(ctx)
}
db.putConn(dc, err)
return err
}
// Ping verifies a connection to the database is still alive,