mirror of
https://github.com/ClusterCockpit/cc-backend
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93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
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// All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package repository
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import (
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"database/sql"
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"sync"
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"time"
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"github.com/ClusterCockpit/cc-backend/pkg/log"
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"github.com/jmoiron/sqlx"
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"github.com/mattn/go-sqlite3"
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"github.com/qustavo/sqlhooks/v2"
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)
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var (
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dbConnOnce sync.Once
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dbConnInstance *DBConnection
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)
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type DBConnection struct {
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DB *sqlx.DB
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Driver string
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}
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type DatabaseOptions struct {
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URL string
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MaxOpenConnections int
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MaxIdleConnections int
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ConnectionMaxLifetime time.Duration
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ConnectionMaxIdleTime time.Duration
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}
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func Connect(driver string, db string) {
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var err error
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var dbHandle *sqlx.DB
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dbConnOnce.Do(func() {
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opts := DatabaseOptions{
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URL: db,
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MaxOpenConnections: 4,
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MaxIdleConnections: 4,
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ConnectionMaxLifetime: time.Hour,
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ConnectionMaxIdleTime: time.Hour,
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}
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switch driver {
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case "sqlite3":
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// - Set WAL mode (not strictly necessary each time because it's persisted in the database, but good for first run)
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// - Set busy timeout, so concurrent writers wait on each other instead of erroring immediately
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// - Enable foreign key checks
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opts.URL += "?_journal=WAL&_timeout=5000&_fk=true"
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if log.Loglevel() == "debug" {
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sql.Register("sqlite3WithHooks", sqlhooks.Wrap(&sqlite3.SQLiteDriver{}, &Hooks{}))
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dbHandle, err = sqlx.Open("sqlite3WithHooks", opts.URL)
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} else {
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dbHandle, err = sqlx.Open("sqlite3", opts.URL)
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}
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case "mysql":
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opts.URL += "?multiStatements=true"
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dbHandle, err = sqlx.Open("mysql", opts.URL)
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default:
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log.Abortf("DB Connection: Unsupported database driver '%s'.\n", driver)
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}
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if err != nil {
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log.Abortf("DB Connection: Could not connect to '%s' database with sqlx.Open().\nError: %s\n", driver, err.Error())
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}
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dbHandle.SetMaxOpenConns(opts.MaxOpenConnections)
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dbHandle.SetMaxIdleConns(opts.MaxIdleConnections)
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dbHandle.SetConnMaxLifetime(opts.ConnectionMaxLifetime)
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dbHandle.SetConnMaxIdleTime(opts.ConnectionMaxIdleTime)
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dbConnInstance = &DBConnection{DB: dbHandle, Driver: driver}
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err = checkDBVersion(driver, dbHandle.DB)
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if err != nil {
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log.Abortf("DB Connection: Failed DB version check.\nError: %s\n", err.Error())
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}
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})
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}
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func GetConnection() *DBConnection {
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if dbConnInstance == nil {
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log.Fatalf("Database connection not initialized!")
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}
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return dbConnInstance
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}
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