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wakapi/migrations/common/custom_pre.go
2020-11-08 12:46:12 +01:00

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package common
import (
"github.com/muety/wakapi/config"
"github.com/muety/wakapi/models"
"gorm.io/gorm"
"log"
)
var customPreMigrations []migrationFunc
func init() {
customPreMigrations = []migrationFunc{
{
f: func(db *gorm.DB, cfg *config.Config) error {
migrator := db.Migrator()
oldTableName, newTableName := "custom_rules", "language_mappings"
oldIndexName, newIndexName := "idx_customrule_user", "idx_language_mapping_user"
if migrator.HasTable(oldTableName) {
log.Printf("renaming '%s' table to '%s'\n", oldTableName, newTableName)
if err := migrator.RenameTable(oldTableName, &models.LanguageMapping{}); err != nil {
return err
}
log.Printf("renaming '%s' index to '%s'\n", oldIndexName, newIndexName)
return migrator.RenameIndex(&models.LanguageMapping{}, oldIndexName, newIndexName)
}
return nil
},
name: "rename language mappings table",
},
{
f: func(db *gorm.DB, cfg *config.Config) error {
// drop all already existing foreign key constraints
// afterwards let them be re-created by auto migrate with the newly introduced cascade settings,
migrator := db.Migrator()
const lookupKey = "20201106-migration_cascade_constraints"
if cfg.Db.Dialect == config.SQLDialectSqlite {
// https://stackoverflow.com/a/1884893/3112139
// unfortunately, we can't migrate existing sqlite databases to the newly introduced cascade settings
// things like deleting all summaries won't work in those cases unless an entirely new db is created
log.Println("not attempting to drop and regenerate constraints on sqlite")
return nil
}
if !migrator.HasTable(&models.KeyStringValue{}) {
log.Println("key-value table not yet existing")
return nil
}
condition := "key = ?"
if cfg.Db.Dialect == config.SQLDialectMysql {
condition = "`key` = ?"
}
lookupResult := db.Where(condition, lookupKey).First(&models.KeyStringValue{})
if lookupResult.Error == nil && lookupResult.RowsAffected > 0 {
log.Println("no need to migrate cascade constraints")
return nil
}
// SELECT * FROM INFORMATION_SCHEMA.table_constraints;
constraints := map[string]interface{}{
"fk_summaries_editors": &models.SummaryItem{},
"fk_summaries_languages": &models.SummaryItem{},
"fk_summaries_machines": &models.SummaryItem{},
"fk_summaries_operating_systems": &models.SummaryItem{},
"fk_summaries_projects": &models.SummaryItem{},
"fk_summary_items_summary": &models.SummaryItem{},
"fk_summaries_user": &models.Summary{},
"fk_language_mappings_user": &models.LanguageMapping{},
"fk_heartbeats_user": &models.Heartbeat{},
"fk_aliases_user": &models.Alias{},
}
for name, table := range constraints {
if migrator.HasConstraint(table, name) {
log.Printf("dropping constraint '%s'", name)
if err := migrator.DropConstraint(table, name); err != nil {
return err
}
}
}
if err := db.Create(&models.KeyStringValue{
Key: lookupKey,
Value: "done",
}).Error; err != nil {
return err
}
return nil
},
name: "add cascade constraints",
},
}
}
func RunCustomPreMigrations(db *gorm.DB, cfg *config.Config) {
for _, m := range customPreMigrations {
log.Printf("potentially running migration '%s'\n", m.name)
if err := m.f(db, cfg); err != nil {
log.Fatalf("migration '%s' failed %v\n", m.name, err)
}
}
}