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