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sql.go
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sql.go
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/*
* Copyright (c) 2018. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package dao
import (
"database/sql"
"fmt"
"time"
"github.com/pydio/cells/common/service/metrics"
)
var (
SqlConnectionOpenTimeout = 60 * time.Second
SqlConnectionOpenRetries = 10 * time.Second
)
func getSqlConnection(driver string, dsn string) (*sql.DB, error) {
if db, err := sql.Open(driver, dsn); err != nil {
return nil, err
} else {
if err := pingWithRetries(db); err != nil {
return nil, err
}
computeStats(db)
return db, nil
}
}
func pingWithRetries(db *sql.DB) error {
var lastErr error
if err := db.Ping(); err == nil {
return nil
} else {
lastErr = err
fmt.Println("[SQL] Server does not answer yet, will retry in 10 seconds...")
}
tick := time.NewTicker(SqlConnectionOpenRetries)
timeout := time.NewTimer(SqlConnectionOpenTimeout)
defer tick.Stop()
defer timeout.Stop()
for {
select {
case <-tick.C:
if err := db.Ping(); err == nil {
return nil
} else {
lastErr = err
fmt.Println("[SQL] Server does not answer yet, will retry in 10 seconds...")
}
case <-timeout.C:
return lastErr
}
}
}
func computeStats(db *sql.DB) {
go func() {
for {
s := db.Stats()
metrics.GetMetrics().Gauge("db_open_connections").Update(float64(s.OpenConnections))
<-time.After(30 * time.Second)
}
}()
}