96 lines
2.7 KiB
Go
96 lines
2.7 KiB
Go
package migrations
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import (
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// stdlib
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"database/sql"
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"log"
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"os"
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"strconv"
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// other
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"github.com/pressly/goose"
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)
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// Initialize initializes database migrations. This is the function
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// where migrations should be registered.
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func Initialize() {
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log.Println("Initializing database migrations...")
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_ = goose.SetDialect("postgres")
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goose.AddNamedMigration("1_create_users_table.go", CreateUsersTableUp, CreateUsersTableDown)
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goose.AddNamedMigration("2_create_groups_info_table.go", CreateGroupsTableUp, CreateGroupsTableDown)
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}
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// Migrate parses environment for necessary parameters and starts
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// database migration process.
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func Migrate(db *sql.DB) {
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log.Println("Starting database migration procedure...")
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var action = "UP"
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actionFromEnv, actionFound := os.LookupEnv("DATABASE_ACTION")
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if actionFound {
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log.Println("Migration action override: " + actionFromEnv)
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action = actionFromEnv
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} else {
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log.Println("Executing default migration action (UP)")
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}
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var count int64
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countFromEnv, countFound := os.LookupEnv("DATABASE_COUNT")
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if countFound {
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log.Println("Migration count override: " + countFromEnv)
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countAsInt, err := strconv.ParseInt(countFromEnv, 10, 64)
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if err != nil {
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log.Fatalln("Failed to convert count gathered from DATABASE_COUNT to integer")
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}
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count = countAsInt
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} else {
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log.Println("Applying or rollback this count of migrations: " + countFromEnv + ". 0 - all.")
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}
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// Execute migrations.
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var err error
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currentDBVersion, gooseerr := goose.GetDBVersion(db)
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if gooseerr != nil {
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log.Fatalln("Failed to get database version: " + gooseerr.Error())
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}
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log.Println("Current database version obtained: " + strconv.Itoa(int(currentDBVersion)))
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switch {
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case action == "UP" && count == 0:
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log.Println("Applying all unapplied migrations...")
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err = goose.Up(db, ".")
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case action == "UP" && count != 0:
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newVersion := currentDBVersion + count
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log.Println("Migrating database to specific version: " + strconv.Itoa(int(newVersion)))
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err = goose.UpTo(db, ".", newVersion)
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case action == "DOWN" && count == 0:
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log.Println("Downgrading database to zero state, you'll need to re-apply migrations!")
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_ = goose.Down(db, ".")
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log.Fatalln("Database downgraded to zero state. You have to re-apply migrations")
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case action == "DOWN" && count != 0:
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newVersion := currentDBVersion - count
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log.Println("Downgrading database to specific version: " + strconv.Itoa(int(newVersion)))
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err = goose.DownTo(db, ".", newVersion)
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default:
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log.Fatalln("Unsupported set of migration parameters, cannot continue: " + action + "/" + countFromEnv)
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}
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if err != nil {
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log.Fatalln("Failed to execute migration sequence: " + err.Error())
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}
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log.Println("Database migrated successfully")
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}
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