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database.go
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database.go
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// reddlinks, a simple link shortener written in Go.
// Copyright (C) 2024 redd
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// Package database is used to handle the database connection and queries.
package database
import (
"database/sql"
"errors"
"fmt"
"github.com/lib/pq" // Driver for postgresql
_ "modernc.org/sqlite" // Driver for sqlite3
)
// DBConnect returns a pointer to a database connection.
//
// It connects to the database using [sql.Open] with the database type and the connection string,
// it then tests the connection before returning it.
func DBConnect(dbType, dbURL, dbUser, dbPass, dbHost, dbPort, dbName string) (*sql.DB, error) {
var err error
var dbase *sql.DB
switch {
case dbURL != "":
// Connect to the database
dbase, err = sql.Open(dbType, dbURL)
if err != nil {
return nil, err
}
// Test the connection
err = dbase.Ping()
// If the postgres server doesn't support ssl, disable it
if errors.Is(err, pq.ErrSSLNotSupported) {
dbURL += "?sslmode=disable"
dbase, err = sql.Open(dbType, dbURL)
if err != nil {
return nil, err
}
err = dbase.Ping()
}
case dbURL == "":
dbURL = fmt.Sprintf(
"user=%s dbname=%s password=%s host=%s port=%s",
dbUser,
dbName,
dbPass,
dbHost,
dbPort,
)
// Connect to the database
dbase, err = sql.Open(dbType, dbURL)
if err != nil {
return nil, err
}
// Test the connection
err = dbase.Ping()
// If the postgres server doesn't support ssl, disable it
if errors.Is(err, pq.ErrSSLNotSupported) {
dbURL += " sslmode=disable"
dbase, err = sql.Open(dbType, dbURL)
if err != nil {
return nil, err
}
err = dbase.Ping()
}
}
return dbase, err
}