139 lines
3.5 KiB
Go
139 lines
3.5 KiB
Go
/*
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* Copyright © 2019 A Bunch Tell LLC.
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*
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* This file is part of WriteFreely.
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*
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* WriteFreely is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, included
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* in the LICENSE file in this source code package.
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*/
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// Package migrations contains database migrations for WriteFreely
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package migrations
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import (
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"database/sql"
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"github.com/writeas/web-core/log"
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)
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// TODO: refactor to use the datastore struct from writefreely pkg
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type datastore struct {
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*sql.DB
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driverName string
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}
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func NewDatastore(db *sql.DB, dn string) *datastore {
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return &datastore{db, dn}
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}
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// TODO: use these consts from writefreely pkg
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const (
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driverMySQL = "mysql"
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driverSQLite = "sqlite3"
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)
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type Migration interface {
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Description() string
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Migrate(db *datastore) error
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}
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type migration struct {
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description string
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migrate func(db *datastore) error
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}
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func New(d string, fn func(db *datastore) error) Migration {
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return &migration{d, fn}
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}
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func (m *migration) Description() string {
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return m.description
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}
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func (m *migration) Migrate(db *datastore) error {
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return m.migrate(db)
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}
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var migrations = []Migration{
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New("support user invites", supportUserInvites), // -> V1 (v0.8.0)
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New("support dynamic instance pages", supportInstancePages), // V1 -> V2 (v0.9.0)
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New("support users suspension", supportUserStatus), // V2 -> V3 (v0.11.0)
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New("support oauth", oauth), // V3 -> V4
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New("support slack oauth", oauthSlack), // V4 -> v5
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New("support ActivityPub mentions", supportActivityPubMentions), // V5 -> V6 (v0.12.0)
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}
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// CurrentVer returns the current migration version the application is on
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func CurrentVer() int {
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return len(migrations)
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}
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func SetInitialMigrations(db *datastore) error {
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// Included schema files represent changes up to V1, so note that in the database
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_, err := db.Exec("INSERT INTO appmigrations (version, migrated, result) VALUES (?, "+db.now()+", ?)", 1, "")
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if err != nil {
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return err
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}
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return nil
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}
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func Migrate(db *datastore) error {
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var version int
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var err error
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if db.tableExists("appmigrations") {
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err = db.QueryRow("SELECT MAX(version) FROM appmigrations").Scan(&version)
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} else {
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log.Info("Initializing appmigrations table...")
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version = 0
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_, err = db.Exec(`CREATE TABLE appmigrations (
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version ` + db.typeInt() + ` NOT NULL,
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migrated ` + db.typeDateTime() + ` NOT NULL,
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result ` + db.typeText() + ` NOT NULL
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) ` + db.engine() + `;`)
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if err != nil {
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return err
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}
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}
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if len(migrations[version:]) > 0 {
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for i, m := range migrations[version:] {
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curVer := version + i + 1
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log.Info("Migrating to V%d: %s", curVer, m.Description())
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err = m.Migrate(db)
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if err != nil {
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return err
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}
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// Update migrations table
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_, err = db.Exec("INSERT INTO appmigrations (version, migrated, result) VALUES (?, "+db.now()+", ?)", curVer, "")
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if err != nil {
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return err
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}
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}
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} else {
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log.Info("Database up-to-date. No migrations to run.")
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}
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return nil
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}
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func (db *datastore) tableExists(t string) bool {
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var dummy string
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var err error
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if db.driverName == driverSQLite {
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err = db.QueryRow("SELECT name FROM sqlite_master WHERE type = 'table' AND name = ?", t).Scan(&dummy)
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} else {
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err = db.QueryRow("SHOW TABLES LIKE '" + t + "'").Scan(&dummy)
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}
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switch {
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case err == sql.ErrNoRows:
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return false
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case err != nil:
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log.Error("Couldn't SHOW TABLES: %v", err)
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return false
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}
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return true
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}
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