76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
// Copyright 2018 Frédéric Guillot. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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package database // import "miniflux.app/database"
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import (
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"database/sql"
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"fmt"
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// Postgresql driver import
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_ "github.com/lib/pq"
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)
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// NewConnectionPool configures the database connection pool.
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func NewConnectionPool(dsn string, minConnections, maxConnections int) (*sql.DB, error) {
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db, err := sql.Open("postgres", dsn)
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if err != nil {
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return nil, err
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}
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db.SetMaxOpenConns(maxConnections)
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db.SetMaxIdleConns(minConnections)
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return db, nil
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}
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// Migrate executes database migrations.
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func Migrate(db *sql.DB) error {
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var currentVersion int
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db.QueryRow(`SELECT version FROM schema_version`).Scan(¤tVersion)
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fmt.Println("-> Current schema version:", currentVersion)
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fmt.Println("-> Latest schema version:", schemaVersion)
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for version := currentVersion; version < schemaVersion; version++ {
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newVersion := version + 1
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fmt.Println("* Migrating to version:", newVersion)
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tx, err := db.Begin()
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if err != nil {
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return fmt.Errorf("[Migration v%d] %v", newVersion, err)
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}
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if err := migrations[version](tx); err != nil {
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tx.Rollback()
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return fmt.Errorf("[Migration v%d] %v", newVersion, err)
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}
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if _, err := tx.Exec(`DELETE FROM schema_version`); err != nil {
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tx.Rollback()
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return fmt.Errorf("[Migration v%d] %v", newVersion, err)
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}
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if _, err := tx.Exec(`INSERT INTO schema_version (version) VALUES ($1)`, newVersion); err != nil {
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tx.Rollback()
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return fmt.Errorf("[Migration v%d] %v", newVersion, err)
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}
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if err := tx.Commit(); err != nil {
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return fmt.Errorf("[Migration v%d] %v", newVersion, err)
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}
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}
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return nil
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}
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// IsSchemaUpToDate checks if the database schema is up to date.
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func IsSchemaUpToDate(db *sql.DB) error {
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var currentVersion int
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db.QueryRow(`SELECT version FROM schema_version`).Scan(¤tVersion)
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if currentVersion < schemaVersion {
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return fmt.Errorf(`the database schema is not up to date: current=v%d expected=v%d`, currentVersion, schemaVersion)
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}
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return nil
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}
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