forked from mirror/ledisdb
535 lines
10 KiB
Go
535 lines
10 KiB
Go
package server
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import (
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"errors"
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"fmt"
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"strings"
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"sync"
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"time"
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"github.com/ledisdb/ledisdb/ledis"
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"github.com/siddontang/go/hack"
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"github.com/siddontang/go/log"
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"github.com/siddontang/goredis"
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)
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func dumpCommand(c *client) error {
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if len(c.args) != 1 {
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return ErrCmdParams
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}
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key := c.args[0]
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if data, err := c.db.Dump(key); err != nil {
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return err
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} else {
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c.resp.writeBulk(data)
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}
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return nil
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}
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func ldumpCommand(c *client) error {
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if len(c.args) != 1 {
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return ErrCmdParams
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}
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key := c.args[0]
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if data, err := c.db.LDump(key); err != nil {
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return err
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} else {
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c.resp.writeBulk(data)
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}
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return nil
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}
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func hdumpCommand(c *client) error {
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if len(c.args) != 1 {
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return ErrCmdParams
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}
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key := c.args[0]
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if data, err := c.db.HDump(key); err != nil {
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return err
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} else {
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c.resp.writeBulk(data)
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}
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return nil
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}
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func sdumpCommand(c *client) error {
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if len(c.args) != 1 {
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return ErrCmdParams
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}
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key := c.args[0]
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if data, err := c.db.SDump(key); err != nil {
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return err
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} else {
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c.resp.writeBulk(data)
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}
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return nil
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}
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func zdumpCommand(c *client) error {
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if len(c.args) != 1 {
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return ErrCmdParams
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}
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key := c.args[0]
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if data, err := c.db.ZDump(key); err != nil {
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return err
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} else {
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c.resp.writeBulk(data)
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}
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return nil
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}
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// unlike redis, restore will try to delete old key first
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func restoreCommand(c *client) error {
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args := c.args
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if len(args) != 3 {
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return ErrCmdParams
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}
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key := args[0]
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ttl, err := ledis.StrInt64(args[1], nil)
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if err != nil {
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return err
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}
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data := args[2]
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if err = c.db.Restore(key, ttl, data); err != nil {
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return err
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} else {
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c.resp.writeStatus(OK)
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}
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return nil
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}
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// maybe only used in xcodis for redis data port
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func xrestoreCommand(c *client) error {
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args := c.args
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if len(args) != 4 {
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return ErrCmdParams
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}
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// tp := strings.ToUpper(string(args[2]))
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key := args[1]
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ttl, err := ledis.StrInt64(args[2], nil)
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if err != nil {
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return err
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}
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data := args[3]
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if err = c.db.Restore(key, ttl, data); err != nil {
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return err
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} else {
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c.resp.writeStatus(OK)
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}
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return nil
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}
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func xdump(db *ledis.DB, tp string, key []byte) ([]byte, error) {
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var err error
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var data []byte
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switch strings.ToUpper(tp) {
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case KVName:
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data, err = db.Dump(key)
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case HashName:
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data, err = db.HDump(key)
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case ListName:
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data, err = db.LDump(key)
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case SetName:
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data, err = db.SDump(key)
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case ZSetName:
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data, err = db.ZDump(key)
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default:
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err = fmt.Errorf("invalid key type %s", tp)
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}
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return data, err
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}
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func xdel(db *ledis.DB, tp string, key []byte) error {
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var err error
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switch strings.ToUpper(tp) {
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case KVName:
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_, err = db.Del(key)
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case HashName:
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_, err = db.HClear(key)
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case ListName:
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_, err = db.LClear(key)
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case SetName:
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_, err = db.SClear(key)
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case ZSetName:
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_, err = db.ZClear(key)
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default:
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err = fmt.Errorf("invalid key type %s", tp)
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}
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return err
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}
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func xttl(db *ledis.DB, tp string, key []byte) (int64, error) {
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switch strings.ToUpper(tp) {
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case KVName:
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return db.TTL(key)
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case HashName:
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return db.HTTL(key)
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case ListName:
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return db.LTTL(key)
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case SetName:
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return db.STTL(key)
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case ZSetName:
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return db.ZTTL(key)
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default:
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return 0, fmt.Errorf("invalid key type %s", tp)
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}
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}
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func xscan(db *ledis.DB, tp string, count int) ([][]byte, error) {
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switch strings.ToUpper(tp) {
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case KVName:
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return db.Scan(KV, nil, count, false, "")
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case HashName:
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return db.Scan(HASH, nil, count, false, "")
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case ListName:
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return db.Scan(LIST, nil, count, false, "")
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case SetName:
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return db.Scan(SET, nil, count, false, "")
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case ZSetName:
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return db.Scan(ZSET, nil, count, false, "")
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default:
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return nil, fmt.Errorf("invalid key type %s", tp)
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}
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}
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func xdumpCommand(c *client) error {
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args := c.args
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if len(args) != 2 {
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return ErrCmdParams
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}
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tp := strings.ToUpper(string(args[0]))
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key := args[1]
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if data, err := xdump(c.db, tp, key); err != nil {
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return err
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} else {
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c.resp.writeBulk(data)
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}
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return nil
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}
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func (app *App) getMigrateClient(addr string) *goredis.Client {
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app.migrateM.Lock()
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mc, ok := app.migrateClients[addr]
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if !ok {
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mc = goredis.NewClient(addr, "")
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app.migrateClients[addr] = mc
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}
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app.migrateM.Unlock()
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return mc
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}
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type migrateKeyLocker struct {
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m sync.Mutex
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locks map[string]struct{}
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}
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func (m *migrateKeyLocker) Lock(key []byte) bool {
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m.m.Lock()
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defer m.m.Unlock()
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k := hack.String(key)
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_, ok := m.locks[k]
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if ok {
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return false
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}
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m.locks[k] = struct{}{}
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return true
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}
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func (m *migrateKeyLocker) Unlock(key []byte) {
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m.m.Lock()
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defer m.m.Unlock()
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delete(m.locks, hack.String(key))
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}
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func newMigrateKeyLocker() *migrateKeyLocker {
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m := new(migrateKeyLocker)
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m.locks = make(map[string]struct{})
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return m
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}
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func (a *App) newMigrateKeyLockers() {
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a.migrateKeyLockers = make(map[string]*migrateKeyLocker)
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a.migrateKeyLockers[KVName] = newMigrateKeyLocker()
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a.migrateKeyLockers[HashName] = newMigrateKeyLocker()
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a.migrateKeyLockers[ListName] = newMigrateKeyLocker()
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a.migrateKeyLockers[SetName] = newMigrateKeyLocker()
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a.migrateKeyLockers[ZSetName] = newMigrateKeyLocker()
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}
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func (a *App) migrateKeyLock(tp string, key []byte) bool {
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l, ok := a.migrateKeyLockers[strings.ToUpper(tp)]
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if !ok {
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return false
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}
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return l.Lock(key)
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}
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func (a *App) migrateKeyUnlock(tp string, key []byte) {
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l, ok := a.migrateKeyLockers[strings.ToUpper(tp)]
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if !ok {
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return
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}
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l.Unlock(key)
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}
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//XMIGRATEDB host port tp count db timeout
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//select count tp type keys and migrate
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//will block any other write operations
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//maybe only for xcodis
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func xmigratedbCommand(c *client) error {
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args := c.args
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if len(args) != 6 {
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return ErrCmdParams
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}
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addr := fmt.Sprintf("%s:%s", string(args[0]), string(args[1]))
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if addr == c.app.cfg.Addr {
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//same server， can not migrate
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return fmt.Errorf("migrate in same server is not allowed")
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}
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tp := strings.ToUpper(string(args[2]))
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count, err := ledis.StrInt64(args[3], nil)
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if err != nil {
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return err
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} else if count <= 0 {
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count = 10
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}
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db, err := parseMigrateDB(c, args[4])
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if err != nil {
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return err
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}
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timeout, err := ledis.StrInt64(args[5], nil)
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if err != nil {
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return err
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} else if timeout < 0 {
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return fmt.Errorf("invalid timeout %d", timeout)
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}
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keys, err := xscan(c.db, tp, int(count))
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if err != nil {
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return err
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} else if len(keys) == 0 {
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c.resp.writeInteger(0)
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return nil
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}
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conn, err := getMigrateDBConn(c, addr, db)
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if err != nil {
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return err
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}
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defer conn.Close()
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migrateNum := int64(0)
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for _, key := range keys {
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err = migrateKey(c, conn, tp, key, timeout)
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if err != nil {
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if err == errNoKey || err == errKeyInMigrating {
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continue
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} else {
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return err
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}
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}
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migrateNum++
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}
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c.resp.writeInteger(migrateNum)
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return nil
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}
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func parseMigrateDB(c *client, arg []byte) (uint64, error) {
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db, err := ledis.StrUint64(arg, nil)
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if err != nil {
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return 0, err
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} else if db >= uint64(c.app.cfg.Databases) {
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return 0, fmt.Errorf("invalid db index %d, must < %d", db, c.app.cfg.Databases)
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}
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return db, nil
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}
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//XMIGRATE host port type key destination-db timeout
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//will block any other write operations
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//maybe only for xcodis
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func xmigrateCommand(c *client) error {
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args := c.args
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if len(args) != 6 {
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return ErrCmdParams
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}
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addr := fmt.Sprintf("%s:%s", string(args[0]), string(args[1]))
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if addr == c.app.cfg.Addr {
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//same server， can not migrate
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return fmt.Errorf("migrate in same server is not allowed")
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}
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tp := strings.ToUpper(string(args[2]))
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key := args[3]
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db, err := parseMigrateDB(c, args[4])
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if err != nil {
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return err
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}
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timeout, err := ledis.StrInt64(args[5], nil)
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if err != nil {
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return err
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} else if timeout < 0 {
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return fmt.Errorf("invalid timeout %d", timeout)
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}
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conn, err := getMigrateDBConn(c, addr, db)
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if err != nil {
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return err
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}
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defer conn.Close()
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// if key is in migrating, we will wait 500ms and retry again
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for i := 0; i < 10; i++ {
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if tp == "ALL" {
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// if tp is ALL, we will migrate the key in all types
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// this feature is useful for xcodis RESTORE or other commands that we don't know the data type exactly
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err = migrateAllTypeKeys(c, conn, key, timeout)
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} else {
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err = migrateKey(c, conn, tp, key, timeout)
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}
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if err != errKeyInMigrating {
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break
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} else {
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log.Infof("%s key %s is in migrating, wait 500ms and retry", tp, key)
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time.Sleep(500 * time.Millisecond)
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}
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}
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if err != nil {
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if err == errNoKey {
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c.resp.writeStatus(NOKEY)
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return nil
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} else {
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return err
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}
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}
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c.resp.writeStatus(OK)
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return nil
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}
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func getMigrateDBConn(c *client, addr string, db uint64) (*goredis.PoolConn, error) {
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mc := c.app.getMigrateClient(addr)
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conn, err := mc.Get()
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if err != nil {
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return nil, err
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}
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if _, err = conn.Do("select", db); err != nil {
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conn.Close()
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return nil, err
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}
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return conn, nil
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}
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var (
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errNoKey = errors.New("migrate key is not exists")
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errKeyInMigrating = errors.New("key is in migrating yet")
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)
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func migrateKey(c *client, conn *goredis.PoolConn, tp string, key []byte, timeout int64) error {
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if !c.app.migrateKeyLock(tp, key) {
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// other may also migrate this key, skip it
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return errKeyInMigrating
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}
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defer c.app.migrateKeyUnlock(tp, key)
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data, err := xdump(c.db, tp, key)
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if err != nil {
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return err
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} else if data == nil {
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return errNoKey
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}
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ttl, err := xttl(c.db, tp, key)
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if err != nil {
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return err
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}
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//timeout is milliseconds
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t := time.Duration(timeout) * time.Millisecond
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conn.SetReadDeadline(time.Now().Add(t))
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//ttl is second, but restore need millisecond
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if _, err = conn.Do("restore", key, ttl*1e3, data); err != nil {
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return err
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}
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if err = xdel(c.db, tp, key); 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 migrateAllTypeKeys(c *client, conn *goredis.PoolConn, key []byte, timeout int64) error {
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for _, tp := range TypeNames {
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err := migrateKey(c, conn, tp, key, timeout)
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if err != nil {
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if err == errNoKey {
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continue
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} else {
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return err
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}
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}
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}
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return nil
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}
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func init() {
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register("dump", dumpCommand)
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register("ldump", ldumpCommand)
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register("hdump", hdumpCommand)
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register("sdump", sdumpCommand)
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register("zdump", zdumpCommand)
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register("restore", restoreCommand)
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register("xrestore", xrestoreCommand)
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register("xdump", xdumpCommand)
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register("xmigrate", xmigrateCommand)
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register("xmigratedb", xmigratedbCommand)
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}
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