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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,191 @@ | ||
| package redisha | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "math/rand" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/meshplus/bitxhub-core/agency" | ||
| "github.com/meshplus/pier/internal/repo" | ||
|
|
||
| "github.com/Rican7/retry" | ||
| "github.com/Rican7/retry/strategy" | ||
| "github.com/go-redis/redis/v8" | ||
| "github.com/google/uuid" | ||
| ) | ||
|
|
||
| // todo: currently outer logic directly New, | ||
| // todo: use register later, the constructor param is not proper | ||
| //func init() { | ||
| // agency.RegisterPierHAConstructor("redis", New) | ||
| //} | ||
|
|
||
| //type RedisConfWrapper struct { | ||
| // agency.HAClient | ||
| // Conf repo.Redis | ||
| //} | ||
|
|
||
| type RedisPierMng struct { | ||
| isMain chan bool | ||
| ID string | ||
| LockName string | ||
| RedisCli *redis.Client | ||
| Expire time.Duration | ||
| Renew time.Duration | ||
| ctx context.Context | ||
| cancel context.CancelFunc | ||
| } | ||
|
|
||
| func (m *RedisPierMng) Start() error { | ||
| m.compete() | ||
| return nil | ||
| } | ||
|
|
||
| func (m *RedisPierMng) Stop() error { | ||
| m.cancel() | ||
| return nil | ||
| } | ||
|
|
||
| func (m *RedisPierMng) IsMain() <-chan bool { | ||
| return m.isMain | ||
| } | ||
|
|
||
| func New(conf repo.Redis, pierID string) agency.PierHA { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| obj := &RedisPierMng{ | ||
| isMain: make(chan bool), | ||
| ID: uuid.New().String(), | ||
| LockName: strings.Join([]string{conf.LockPrefix, pierID}, "_"), | ||
| RedisCli: redis.NewClient(&redis.Options{ | ||
| Addr: conf.Address, | ||
| Password: conf.Password, | ||
| DB: conf.Database, | ||
| }), | ||
| Expire: time.Duration(conf.LeaseTimeout * int64(time.Second)), | ||
| Renew: time.Duration(conf.LeaseRenewal * int64(time.Second)), | ||
| ctx: ctx, | ||
| cancel: cancel, | ||
| } | ||
| return obj | ||
| } | ||
|
|
||
| func (m *RedisPierMng) compete() { | ||
| time.Sleep(time.Duration(int64(time.Millisecond) * rand.Int63n(1000))) | ||
| _ = retry.Retry(func(attempt uint) error { | ||
| locked, err := m.lock() | ||
| if err != nil { | ||
| fmt.Printf("[instance-%s] compete lock error: %s\n", m.ID, err.Error()) | ||
| return err | ||
| } | ||
| if locked { | ||
| m.startMain() | ||
| } else { | ||
| m.startAux() | ||
| } | ||
| return nil | ||
| }, strategy.Wait(2*time.Second)) | ||
| } | ||
|
|
||
| func (m *RedisPierMng) startMain() { | ||
| ticker := time.NewTicker(m.Renew) | ||
| go func() { | ||
| m.isMain <- true | ||
| fmt.Printf("[instance-%s] start in main mode\n", m.ID) | ||
| for { | ||
| select { | ||
| case <-ticker.C: | ||
| needStartAux := true | ||
| str, err := m.RedisCli.Get(m.ctx, m.LockName).Result() | ||
| if err != nil { | ||
| fmt.Printf("[instance-%s] get lock value error: %s\n", m.ID, err.Error()) | ||
| } else { | ||
| if str == m.ID { | ||
| if rerr := retry.Retry( | ||
| func(attempt uint) error { | ||
| success, eerr := m.RedisCli.Expire(m.ctx, m.LockName, m.Expire).Result() | ||
| if eerr != nil { | ||
| fmt.Printf("[instance-%s] set expire error: %s\n", m.ID, eerr.Error()) | ||
| return eerr | ||
| } | ||
| if success { | ||
| // value == self.ID && set Expire success, stay main | ||
| needStartAux = false | ||
| } | ||
| return nil | ||
| }, | ||
| strategy.Limit(3), | ||
| ); rerr != nil { | ||
| fmt.Printf("[instance-%s] retry set expire finished with error: %s\n", m.ID, rerr.Error()) | ||
| } | ||
| } | ||
| } | ||
| if needStartAux { | ||
| fmt.Printf("[instance-%s] quit main mode\n", m.ID) | ||
| m.startAux() | ||
| return | ||
| } | ||
| case <-m.ctx.Done(): | ||
| _ = m.unlock() | ||
| return | ||
| } | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func (m *RedisPierMng) startAux() { | ||
| ticker := time.NewTicker(m.Expire) | ||
| go func() { | ||
| m.isMain <- false | ||
| fmt.Printf("[instance-%s] start in aux mode\n", m.ID) | ||
| for { | ||
| select { | ||
| case <-ticker.C: | ||
| locked, err := m.lock() | ||
| if err != nil { | ||
| fmt.Printf("[instance-%s] in aux mode, try lock error: %s\n", m.ID, err.Error()) | ||
| continue | ||
| } | ||
| if !locked { | ||
| fmt.Printf("[instance-%s] in aux mode, try lock failed\n", m.ID) | ||
| continue | ||
| } | ||
| m.startMain() | ||
| return | ||
| case <-m.ctx.Done(): | ||
| _ = m.unlock() | ||
| return | ||
| } | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func (m *RedisPierMng) lock() (bool, error) { | ||
| return m.RedisCli.SetNX(m.ctx, m.LockName, m.ID, m.Expire).Result() | ||
| } | ||
|
|
||
| func (m *RedisPierMng) unlock() error { | ||
| script := redis.NewScript(LauCheckAndDelete) | ||
| res, err := script.Run(m.ctx, m.RedisCli, []string{m.LockName}, m.ID).Int64() | ||
| if err != nil { | ||
| fmt.Printf("[instance-%s] unlock error: %s\n", m.ID, err.Error()) | ||
| return err | ||
| } | ||
| if res != 1 { | ||
| fmt.Printf("[instance-%s] unlock failed: res %d\n", m.ID, res) | ||
| return errors.New("can not unlock because del result not is one") | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| const ( | ||
| LauCheckAndDelete = ` | ||
| if(redis.call('get',KEYS[1])==ARGV[1]) then | ||
| return redis.call('del',KEYS[1]) | ||
| else | ||
| return 0 | ||
| end | ||
| ` | ||
| ) |