package redis import ( "context" "crypto/tls" "errors" "net" "strings" "sync" "time" "github.com/go-redis/redis/v8/internal" "github.com/go-redis/redis/v8/internal/pool" "github.com/go-redis/redis/v8/internal/rand" ) //------------------------------------------------------------------------------ // FailoverOptions are used to configure a failover client and should // be passed to NewFailoverClient. type FailoverOptions struct { // The master name. MasterName string // A seed list of host:port addresses of sentinel nodes. SentinelAddrs []string // Sentinel password from "requirepass " (if enabled) in Sentinel configuration SentinelPassword string // Allows routing read-only commands to the closest master or slave node. // This option only works with NewFailoverClusterClient. RouteByLatency bool // Allows routing read-only commands to the random master or slave node. // This option only works with NewFailoverClusterClient. RouteRandomly bool // Route all commands to slave read-only nodes. SlaveOnly bool // Use slaves disconnected with master when cannot get connected slaves // Now, this option only works in RandomSlaveAddr function. UseDisconnectedSlaves bool // Client queries sentinels in a random order QuerySentinelRandomly bool // Following options are copied from Options struct. Dialer func(ctx context.Context, network, addr string) (net.Conn, error) OnConnect func(ctx context.Context, cn *Conn) error Username string Password string DB int MaxRetries int MinRetryBackoff time.Duration MaxRetryBackoff time.Duration DialTimeout time.Duration ReadTimeout time.Duration WriteTimeout time.Duration PoolSize int MinIdleConns int MaxConnAge time.Duration PoolTimeout time.Duration IdleTimeout time.Duration IdleCheckFrequency time.Duration TLSConfig *tls.Config } func (opt *FailoverOptions) clientOptions() *Options { return &Options{ Addr: "FailoverClient", Dialer: opt.Dialer, OnConnect: opt.OnConnect, DB: opt.DB, Username: opt.Username, Password: opt.Password, MaxRetries: opt.MaxRetries, MinRetryBackoff: opt.MinRetryBackoff, MaxRetryBackoff: opt.MaxRetryBackoff, DialTimeout: opt.DialTimeout, ReadTimeout: opt.ReadTimeout, WriteTimeout: opt.WriteTimeout, PoolSize: opt.PoolSize, PoolTimeout: opt.PoolTimeout, IdleTimeout: opt.IdleTimeout, IdleCheckFrequency: opt.IdleCheckFrequency, MinIdleConns: opt.MinIdleConns, MaxConnAge: opt.MaxConnAge, TLSConfig: opt.TLSConfig, } } func (opt *FailoverOptions) sentinelOptions(addr string) *Options { return &Options{ Addr: addr, Dialer: opt.Dialer, OnConnect: opt.OnConnect, DB: 0, Password: opt.SentinelPassword, MaxRetries: opt.MaxRetries, MinRetryBackoff: opt.MinRetryBackoff, MaxRetryBackoff: opt.MaxRetryBackoff, DialTimeout: opt.DialTimeout, ReadTimeout: opt.ReadTimeout, WriteTimeout: opt.WriteTimeout, PoolSize: opt.PoolSize, PoolTimeout: opt.PoolTimeout, IdleTimeout: opt.IdleTimeout, IdleCheckFrequency: opt.IdleCheckFrequency, MinIdleConns: opt.MinIdleConns, MaxConnAge: opt.MaxConnAge, TLSConfig: opt.TLSConfig, } } func (opt *FailoverOptions) clusterOptions() *ClusterOptions { return &ClusterOptions{ Dialer: opt.Dialer, OnConnect: opt.OnConnect, Username: opt.Username, Password: opt.Password, MaxRedirects: opt.MaxRetries, RouteByLatency: opt.RouteByLatency, RouteRandomly: opt.RouteRandomly, MinRetryBackoff: opt.MinRetryBackoff, MaxRetryBackoff: opt.MaxRetryBackoff, DialTimeout: opt.DialTimeout, ReadTimeout: opt.ReadTimeout, WriteTimeout: opt.WriteTimeout, PoolSize: opt.PoolSize, PoolTimeout: opt.PoolTimeout, IdleTimeout: opt.IdleTimeout, IdleCheckFrequency: opt.IdleCheckFrequency, MinIdleConns: opt.MinIdleConns, MaxConnAge: opt.MaxConnAge, TLSConfig: opt.TLSConfig, } } // NewFailoverClient returns a Redis client that uses Redis Sentinel // for automatic failover. It's safe for concurrent use by multiple // goroutines. func NewFailoverClient(failoverOpt *FailoverOptions) *Client { if failoverOpt.RouteByLatency { panic("to route commands by latency, use NewFailoverClusterClient") } if failoverOpt.RouteRandomly { panic("to route commands randomly, use NewFailoverClusterClient") } sentinelAddrs := make([]string, len(failoverOpt.SentinelAddrs)) copy(sentinelAddrs, failoverOpt.SentinelAddrs) rand.Shuffle(len(sentinelAddrs), func(i, j int) { sentinelAddrs[i], sentinelAddrs[j] = sentinelAddrs[j], sentinelAddrs[i] }) failover := &sentinelFailover{ opt: failoverOpt, sentinelAddrs: sentinelAddrs, } opt := failoverOpt.clientOptions() opt.Dialer = masterSlaveDialer(failover) opt.init() connPool := newConnPool(opt) failover.mu.Lock() failover.onFailover = func(ctx context.Context, addr string) { _ = connPool.Filter(func(cn *pool.Conn) bool { return cn.RemoteAddr().String() != addr }) } failover.mu.Unlock() c := Client{ baseClient: newBaseClient(opt, connPool), ctx: context.Background(), } c.cmdable = c.Process c.onClose = failover.Close return &c } func masterSlaveDialer( failover *sentinelFailover, ) func(ctx context.Context, network, addr string) (net.Conn, error) { return func(ctx context.Context, network, _ string) (net.Conn, error) { var addr string var err error if failover.opt.SlaveOnly { addr, err = failover.RandomSlaveAddr(ctx) } else { addr, err = failover.MasterAddr(ctx) if err == nil { failover.trySwitchMaster(ctx, addr) } } if err != nil { return nil, err } if failover.opt.Dialer != nil { return failover.opt.Dialer(ctx, network, addr) } return net.DialTimeout("tcp", addr, failover.opt.DialTimeout) } } //------------------------------------------------------------------------------ // SentinelClient is a client for a Redis Sentinel. type SentinelClient struct { *baseClient hooks ctx context.Context } func NewSentinelClient(opt *Options) *SentinelClient { opt.init() c := &SentinelClient{ baseClient: &baseClient{ opt: opt, connPool: newConnPool(opt), }, ctx: context.Background(), } return c } func (c *SentinelClient) Context() context.Context { return c.ctx } func (c *SentinelClient) WithContext(ctx context.Context) *SentinelClient { if ctx == nil { panic("nil context") } clone := *c clone.ctx = ctx return &clone } func (c *SentinelClient) Process(ctx context.Context, cmd Cmder) error { return c.hooks.process(ctx, cmd, c.baseClient.process) } func (c *SentinelClient) pubSub() *PubSub { pubsub := &PubSub{ opt: c.opt, newConn: func(ctx context.Context, channels []string) (*pool.Conn, error) { return c.newConn(ctx) }, closeConn: c.connPool.CloseConn, } pubsub.init() return pubsub } // Ping is used to test if a connection is still alive, or to // measure latency. func (c *SentinelClient) Ping(ctx context.Context) *StringCmd { cmd := NewStringCmd(ctx, "ping") _ = c.Process(ctx, cmd) return cmd } // Subscribe subscribes the client to the specified channels. // Channels can be omitted to create empty subscription. func (c *SentinelClient) Subscribe(ctx context.Context, channels ...string) *PubSub { pubsub := c.pubSub() if len(channels) > 0 { _ = pubsub.Subscribe(ctx, channels...) } return pubsub } // PSubscribe subscribes the client to the given patterns. // Patterns can be omitted to create empty subscription. func (c *SentinelClient) PSubscribe(ctx context.Context, channels ...string) *PubSub { pubsub := c.pubSub() if len(channels) > 0 { _ = pubsub.PSubscribe(ctx, channels...) } return pubsub } func (c *SentinelClient) GetMasterAddrByName(ctx context.Context, name string) *StringSliceCmd { cmd := NewStringSliceCmd(ctx, "sentinel", "get-master-addr-by-name", name) _ = c.Process(ctx, cmd) return cmd } func (c *SentinelClient) Sentinels(ctx context.Context, name string) *SliceCmd { cmd := NewSliceCmd(ctx, "sentinel", "sentinels", name) _ = c.Process(ctx, cmd) return cmd } // Failover forces a failover as if the master was not reachable, and without // asking for agreement to other Sentinels. func (c *SentinelClient) Failover(ctx context.Context, name string) *StatusCmd { cmd := NewStatusCmd(ctx, "sentinel", "failover", name) _ = c.Process(ctx, cmd) return cmd } // Reset resets all the masters with matching name. The pattern argument is a // glob-style pattern. The reset process clears any previous state in a master // (including a failover in progress), and removes every slave and sentinel // already discovered and associated with the master. func (c *SentinelClient) Reset(ctx context.Context, pattern string) *IntCmd { cmd := NewIntCmd(ctx, "sentinel", "reset", pattern) _ = c.Process(ctx, cmd) return cmd } // FlushConfig forces Sentinel to rewrite its configuration on disk, including // the current Sentinel state. func (c *SentinelClient) FlushConfig(ctx context.Context) *StatusCmd { cmd := NewStatusCmd(ctx, "sentinel", "flushconfig") _ = c.Process(ctx, cmd) return cmd } // Master shows the state and info of the specified master. func (c *SentinelClient) Master(ctx context.Context, name string) *StringStringMapCmd { cmd := NewStringStringMapCmd(ctx, "sentinel", "master", name) _ = c.Process(ctx, cmd) return cmd } // Masters shows a list of monitored masters and their state. func (c *SentinelClient) Masters(ctx context.Context) *SliceCmd { cmd := NewSliceCmd(ctx, "sentinel", "masters") _ = c.Process(ctx, cmd) return cmd } // Slaves shows a list of slaves for the specified master and their state. func (c *SentinelClient) Slaves(ctx context.Context, name string) *SliceCmd { cmd := NewSliceCmd(ctx, "sentinel", "slaves", name) _ = c.Process(ctx, cmd) return cmd } // CkQuorum checks if the current Sentinel configuration is able to reach the // quorum needed to failover a master, and the majority needed to authorize the // failover. This command should be used in monitoring systems to check if a // Sentinel deployment is ok. func (c *SentinelClient) CkQuorum(ctx context.Context, name string) *StringCmd { cmd := NewStringCmd(ctx, "sentinel", "ckquorum", name) _ = c.Process(ctx, cmd) return cmd } // Monitor tells the Sentinel to start monitoring a new master with the specified // name, ip, port, and quorum. func (c *SentinelClient) Monitor(ctx context.Context, name, ip, port, quorum string) *StringCmd { cmd := NewStringCmd(ctx, "sentinel", "monitor", name, ip, port, quorum) _ = c.Process(ctx, cmd) return cmd } // Set is used in order to change configuration parameters of a specific master. func (c *SentinelClient) Set(ctx context.Context, name, option, value string) *StringCmd { cmd := NewStringCmd(ctx, "sentinel", "set", name, option, value) _ = c.Process(ctx, cmd) return cmd } // Remove is used in order to remove the specified master: the master will no // longer be monitored, and will totally be removed from the internal state of // the Sentinel. func (c *SentinelClient) Remove(ctx context.Context, name string) *StringCmd { cmd := NewStringCmd(ctx, "sentinel", "remove", name) _ = c.Process(ctx, cmd) return cmd } //------------------------------------------------------------------------------ type sentinelFailover struct { opt *FailoverOptions sentinelAddrs []string onFailover func(ctx context.Context, addr string) onUpdate func(ctx context.Context) mu sync.RWMutex _masterAddr string sentinel *SentinelClient pubsub *PubSub } func (c *sentinelFailover) Close() error { c.mu.Lock() defer c.mu.Unlock() if c.sentinel != nil { return c.closeSentinel() } return nil } func (c *sentinelFailover) closeSentinel() error { firstErr := c.pubsub.Close() c.pubsub = nil err := c.sentinel.Close() if err != nil && firstErr == nil { firstErr = err } c.sentinel = nil return firstErr } func (c *sentinelFailover) RandomSlaveAddr(ctx context.Context) (string, error) { if c.opt == nil { return "", errors.New("opt is nil") } addresses, err := c.slaveAddrs(ctx, false) if err != nil { return "", err } if len(addresses) == 0 && c.opt.UseDisconnectedSlaves { addresses, err = c.slaveAddrs(ctx, true) if err != nil { return "", err } } if len(addresses) == 0 { return c.MasterAddr(ctx) } return addresses[rand.Intn(len(addresses))], nil } func (c *sentinelFailover) MasterAddr(ctx context.Context) (string, error) { c.mu.RLock() sentinel := c.sentinel c.mu.RUnlock() if sentinel != nil { addr := c.getMasterAddr(ctx, sentinel) if addr != "" { return addr, nil } } c.mu.Lock() defer c.mu.Unlock() if c.sentinel != nil { addr := c.getMasterAddr(ctx, c.sentinel) if addr != "" { return addr, nil } _ = c.closeSentinel() } for i, sentinelAddr := range c.sentinelAddrs { sentinel := NewSentinelClient(c.opt.sentinelOptions(sentinelAddr)) masterAddr, err := sentinel.GetMasterAddrByName(ctx, c.opt.MasterName).Result() if err != nil { internal.Logger.Printf(ctx, "sentinel: GetMasterAddrByName master=%q failed: %s", c.opt.MasterName, err) _ = sentinel.Close() continue } // Push working sentinel to the top. c.sentinelAddrs[0], c.sentinelAddrs[i] = c.sentinelAddrs[i], c.sentinelAddrs[0] c.setSentinel(ctx, sentinel) addr := net.JoinHostPort(masterAddr[0], masterAddr[1]) return addr, nil } return "", errors.New("redis: all sentinels specified in configuration are unreachable") } func (c *sentinelFailover) slaveAddrs(ctx context.Context, useDisconnected bool) ([]string, error) { c.mu.RLock() sentinel := c.sentinel c.mu.RUnlock() if sentinel != nil { addrs := c.getSlaveAddrs(ctx, sentinel) if len(addrs) > 0 { return addrs, nil } } c.mu.Lock() defer c.mu.Unlock() if c.sentinel != nil { addrs := c.getSlaveAddrs(ctx, c.sentinel) if len(addrs) > 0 { return addrs, nil } _ = c.closeSentinel() } var sentinelReachable bool for i, sentinelAddr := range c.sentinelAddrs { sentinel := NewSentinelClient(c.opt.sentinelOptions(sentinelAddr)) slaves, err := sentinel.Slaves(ctx, c.opt.MasterName).Result() if err != nil { internal.Logger.Printf(ctx, "sentinel: Slaves master=%q failed: %s", c.opt.MasterName, err) _ = sentinel.Close() continue } sentinelReachable = true addrs := parseSlaveAddrs(slaves, useDisconnected) if len(addrs) == 0 { continue } // Push working sentinel to the top. c.sentinelAddrs[0], c.sentinelAddrs[i] = c.sentinelAddrs[i], c.sentinelAddrs[0] c.setSentinel(ctx, sentinel) return addrs, nil } if sentinelReachable { return []string{}, nil } return []string{}, errors.New("redis: all sentinels specified in configuration are unreachable") } func (c *sentinelFailover) getMasterAddr(ctx context.Context, sentinel *SentinelClient) string { addr, err := sentinel.GetMasterAddrByName(ctx, c.opt.MasterName).Result() if err != nil { internal.Logger.Printf(ctx, "sentinel: GetMasterAddrByName name=%q failed: %s", c.opt.MasterName, err) return "" } return net.JoinHostPort(addr[0], addr[1]) } func (c *sentinelFailover) getSlaveAddrs(ctx context.Context, sentinel *SentinelClient) []string { addrs, err := sentinel.Slaves(ctx, c.opt.MasterName).Result() if err != nil { internal.Logger.Printf(ctx, "sentinel: Slaves name=%q failed: %s", c.opt.MasterName, err) return []string{} } return parseSlaveAddrs(addrs, false) } func parseSlaveAddrs(addrs []interface{}, keepDisconnected bool) []string { nodes := make([]string, 0, len(addrs)) for _, node := range addrs { ip := "" port := "" flags := []string{} lastkey := "" isDown := false for _, key := range node.([]interface{}) { switch lastkey { case "ip": ip = key.(string) case "port": port = key.(string) case "flags": flags = strings.Split(key.(string), ",") } lastkey = key.(string) } for _, flag := range flags { switch flag { case "s_down", "o_down": isDown = true case "disconnected": if !keepDisconnected { isDown = true } } } if !isDown { nodes = append(nodes, net.JoinHostPort(ip, port)) } } return nodes } func (c *sentinelFailover) trySwitchMaster(ctx context.Context, addr string) { c.mu.RLock() currentAddr := c._masterAddr //nolint:ifshort c.mu.RUnlock() if addr == currentAddr { return } c.mu.Lock() defer c.mu.Unlock() if addr == c._masterAddr { return } c._masterAddr = addr internal.Logger.Printf(ctx, "sentinel: new master=%q addr=%q", c.opt.MasterName, addr) if c.onFailover != nil { c.onFailover(ctx, addr) } } func (c *sentinelFailover) setSentinel(ctx context.Context, sentinel *SentinelClient) { if c.sentinel != nil { panic("not reached") } c.sentinel = sentinel c.discoverSentinels(ctx) c.pubsub = sentinel.Subscribe(ctx, "+switch-master", "+slave-reconf-done") go c.listen(c.pubsub) } func (c *sentinelFailover) discoverSentinels(ctx context.Context) { sentinels, err := c.sentinel.Sentinels(ctx, c.opt.MasterName).Result() if err != nil { internal.Logger.Printf(ctx, "sentinel: Sentinels master=%q failed: %s", c.opt.MasterName, err) return } for _, sentinel := range sentinels { vals := sentinel.([]interface{}) var ip, port string for i := 0; i < len(vals); i += 2 { key := vals[i].(string) switch key { case "ip": ip = vals[i+1].(string) case "port": port = vals[i+1].(string) } } if ip != "" && port != "" { sentinelAddr := net.JoinHostPort(ip, port) if !contains(c.sentinelAddrs, sentinelAddr) { internal.Logger.Printf(ctx, "sentinel: discovered new sentinel=%q for master=%q", sentinelAddr, c.opt.MasterName) c.sentinelAddrs = append(c.sentinelAddrs, sentinelAddr) } } } } func (c *sentinelFailover) listen(pubsub *PubSub) { ctx := context.TODO() if c.onUpdate != nil { c.onUpdate(ctx) } ch := pubsub.Channel() for msg := range ch { if msg.Channel == "+switch-master" { parts := strings.Split(msg.Payload, " ") if parts[0] != c.opt.MasterName { internal.Logger.Printf(pubsub.getContext(), "sentinel: ignore addr for master=%q", parts[0]) continue } addr := net.JoinHostPort(parts[3], parts[4]) c.trySwitchMaster(pubsub.getContext(), addr) } if c.onUpdate != nil { c.onUpdate(ctx) } } } func contains(slice []string, str string) bool { for _, s := range slice { if s == str { return true } } return false } //------------------------------------------------------------------------------ // NewFailoverClusterClient returns a client that supports routing read-only commands // to a slave node. func NewFailoverClusterClient(failoverOpt *FailoverOptions) *ClusterClient { sentinelAddrs := make([]string, len(failoverOpt.SentinelAddrs)) copy(sentinelAddrs, failoverOpt.SentinelAddrs) failover := &sentinelFailover{ opt: failoverOpt, sentinelAddrs: sentinelAddrs, } opt := failoverOpt.clusterOptions() opt.ClusterSlots = func(ctx context.Context) ([]ClusterSlot, error) { masterAddr, err := failover.MasterAddr(ctx) if err != nil { return nil, err } nodes := []ClusterNode{{ Addr: masterAddr, }} slaveAddrs, err := failover.slaveAddrs(ctx, false) if err != nil { return nil, err } for _, slaveAddr := range slaveAddrs { nodes = append(nodes, ClusterNode{ Addr: slaveAddr, }) } slots := []ClusterSlot{ { Start: 0, End: 16383, Nodes: nodes, }, } return slots, nil } c := NewClusterClient(opt) failover.mu.Lock() failover.onUpdate = func(ctx context.Context) { c.ReloadState(ctx) } failover.mu.Unlock() return c }