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v1.1.2 Latest Latest Go to latest Published: Jul 1, 2023 License: AGPL-3.0 Imports: 4 Imported by: 0

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var ErrUnknownVersion = errors.New("version is unknown")

func DoMigration(name string, m MigrationMap) error

func GetCurrentVersion(name string) int64

func SetVersion(name string, version int64) (oldVersion int64, err error)

type Migration interface {
	Func() MigrationFunc
	TargetVersion() int64
}

func CreateSimpleMigration(targetVersion int64, f MigrationFunc) Migration

CreateSimpleMigration 可以用来快速创建一个 Migration 的helper 如果逻辑较为复杂，需要其他更多信息，也可以自行实现 Migration

type MigrationFunc func() error

MigrationFunc 定义了迁移函数，实现的时候只能在当前goroutine内操作，不可创建其他goroutine，执行时会在RW事务中

func ChainMigration(fn ...MigrationFunc) MigrationFunc

ChainMigration 将多个 MigrationFunc 组合成一个 MigrationFunc ，每个 MigrationFunc 会按顺序执行

func CopyKeyValueByPattern(patternFunc localdb.KeyPatternFunc,
	operator func(key, value string) (string, string)) MigrationFunc

CopyKeyValueByPattern 遍历一个KeyPattern，对每个key/value执行operator，并把operator的返回值作为新的key/value，保留TTL 如果key变化了，不会删除老的key

func MigrationKeyValueByPattern(patternFunc localdb.KeyPatternFunc,
	operator func(key, value string) (string, string)) MigrationFunc

MigrationKeyValueByPattern 遍历一个KeyPattern，对每个key/value执行operator，并把operator的返回值作为新的key/value，保留TTL 如果key变化了，会删除老的key

func MigrationValueByPattern(patternFunc localdb.KeyPatternFunc,
	operator func(key, value string) string) MigrationFunc

MigrationValueByPattern 遍历一个KeyPattern，对每个key/value执行operator，并把operator的返回值作为新的value，保留TTL

type MigrationMap interface {
	From(v int64) Migration
}

func NewMigrationMapFromMap(m map[int64]Migration) MigrationMap