mirror of
https://github.com/go-gitea/gitea.git
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* Update go-redis to v8.4.0 * github.com/go-redis/redis/v8 v8.4.0 -> v8.5.0 * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * TODO * Use the Queue termination channel as the default context for pushes Signed-off-by: Andrew Thornton <art27@cantab.net> * missed one Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: zeripath <art27@cantab.net>
732 lines
16 KiB
Go
Vendored
732 lines
16 KiB
Go
Vendored
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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"fmt"
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"net"
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"strconv"
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"sync"
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"sync/atomic"
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"time"
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"github.com/cespare/xxhash/v2"
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"github.com/dgryski/go-rendezvous"
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"github.com/go-redis/redis/v8/internal"
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"github.com/go-redis/redis/v8/internal/hashtag"
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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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var errRingShardsDown = errors.New("redis: all ring shards are down")
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//------------------------------------------------------------------------------
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type ConsistentHash interface {
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Get(string) string
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}
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type rendezvousWrapper struct {
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*rendezvous.Rendezvous
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}
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func (w rendezvousWrapper) Get(key string) string {
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return w.Lookup(key)
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}
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func newRendezvous(shards []string) ConsistentHash {
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return rendezvousWrapper{rendezvous.New(shards, xxhash.Sum64String)}
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}
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//------------------------------------------------------------------------------
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// RingOptions are used to configure a ring client and should be
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// passed to NewRing.
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type RingOptions struct {
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// Map of name => host:port addresses of ring shards.
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Addrs map[string]string
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// NewClient creates a shard client with provided name and options.
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NewClient func(name string, opt *Options) *Client
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// Frequency of PING commands sent to check shards availability.
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// Shard is considered down after 3 subsequent failed checks.
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HeartbeatFrequency time.Duration
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// NewConsistentHash returns a consistent hash that is used
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// to distribute keys across the shards.
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//
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// See https://medium.com/@dgryski/consistent-hashing-algorithmic-tradeoffs-ef6b8e2fcae8
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// for consistent hashing algorithmic tradeoffs.
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NewConsistentHash func(shards []string) ConsistentHash
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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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Limiter Limiter
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}
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func (opt *RingOptions) init() {
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if opt.NewClient == nil {
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opt.NewClient = func(name string, opt *Options) *Client {
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return NewClient(opt)
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}
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}
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if opt.HeartbeatFrequency == 0 {
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opt.HeartbeatFrequency = 500 * time.Millisecond
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}
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if opt.NewConsistentHash == nil {
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opt.NewConsistentHash = newRendezvous
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}
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if opt.MaxRetries == -1 {
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opt.MaxRetries = 0
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} else if opt.MaxRetries == 0 {
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opt.MaxRetries = 3
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}
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switch opt.MinRetryBackoff {
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case -1:
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opt.MinRetryBackoff = 0
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case 0:
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opt.MinRetryBackoff = 8 * time.Millisecond
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}
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switch opt.MaxRetryBackoff {
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case -1:
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opt.MaxRetryBackoff = 0
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case 0:
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opt.MaxRetryBackoff = 512 * time.Millisecond
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}
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}
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func (opt *RingOptions) clientOptions() *Options {
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return &Options{
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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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DB: opt.DB,
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MaxRetries: -1,
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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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MinIdleConns: opt.MinIdleConns,
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MaxConnAge: opt.MaxConnAge,
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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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TLSConfig: opt.TLSConfig,
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Limiter: opt.Limiter,
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}
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}
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//------------------------------------------------------------------------------
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type ringShard struct {
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Client *Client
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down int32
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}
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func newRingShard(opt *RingOptions, name, addr string) *ringShard {
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clopt := opt.clientOptions()
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clopt.Addr = addr
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return &ringShard{
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Client: opt.NewClient(name, clopt),
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}
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}
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func (shard *ringShard) String() string {
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var state string
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if shard.IsUp() {
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state = "up"
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} else {
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state = "down"
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}
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return fmt.Sprintf("%s is %s", shard.Client, state)
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}
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func (shard *ringShard) IsDown() bool {
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const threshold = 3
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return atomic.LoadInt32(&shard.down) >= threshold
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}
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func (shard *ringShard) IsUp() bool {
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return !shard.IsDown()
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}
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// Vote votes to set shard state and returns true if state was changed.
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func (shard *ringShard) Vote(up bool) bool {
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if up {
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changed := shard.IsDown()
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atomic.StoreInt32(&shard.down, 0)
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return changed
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}
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if shard.IsDown() {
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return false
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}
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atomic.AddInt32(&shard.down, 1)
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return shard.IsDown()
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}
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//------------------------------------------------------------------------------
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type ringShards struct {
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opt *RingOptions
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mu sync.RWMutex
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hash ConsistentHash
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shards map[string]*ringShard // read only
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list []*ringShard // read only
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numShard int
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closed bool
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}
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func newRingShards(opt *RingOptions) *ringShards {
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shards := make(map[string]*ringShard, len(opt.Addrs))
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list := make([]*ringShard, 0, len(shards))
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for name, addr := range opt.Addrs {
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shard := newRingShard(opt, name, addr)
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shards[name] = shard
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list = append(list, shard)
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}
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c := &ringShards{
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opt: opt,
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shards: shards,
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list: list,
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}
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c.rebalance()
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return c
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}
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func (c *ringShards) List() []*ringShard {
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var list []*ringShard
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c.mu.RLock()
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if !c.closed {
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list = c.list
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}
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c.mu.RUnlock()
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return list
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}
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func (c *ringShards) Hash(key string) string {
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key = hashtag.Key(key)
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var hash string
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c.mu.RLock()
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if c.numShard > 0 {
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hash = c.hash.Get(key)
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}
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c.mu.RUnlock()
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return hash
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}
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func (c *ringShards) GetByKey(key string) (*ringShard, error) {
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key = hashtag.Key(key)
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c.mu.RLock()
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if c.closed {
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c.mu.RUnlock()
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return nil, pool.ErrClosed
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}
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if c.numShard == 0 {
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c.mu.RUnlock()
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return nil, errRingShardsDown
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}
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hash := c.hash.Get(key)
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if hash == "" {
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c.mu.RUnlock()
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return nil, errRingShardsDown
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}
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shard := c.shards[hash]
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c.mu.RUnlock()
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return shard, nil
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}
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func (c *ringShards) GetByName(shardName string) (*ringShard, error) {
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if shardName == "" {
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return c.Random()
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}
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c.mu.RLock()
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shard := c.shards[shardName]
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c.mu.RUnlock()
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return shard, nil
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}
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func (c *ringShards) Random() (*ringShard, error) {
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return c.GetByKey(strconv.Itoa(rand.Int()))
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}
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// heartbeat monitors state of each shard in the ring.
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func (c *ringShards) Heartbeat(frequency time.Duration) {
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ticker := time.NewTicker(frequency)
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defer ticker.Stop()
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ctx := context.Background()
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for range ticker.C {
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var rebalance bool
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for _, shard := range c.List() {
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err := shard.Client.Ping(ctx).Err()
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isUp := err == nil || err == pool.ErrPoolTimeout
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if shard.Vote(isUp) {
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internal.Logger.Printf(context.Background(), "ring shard state changed: %s", shard)
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rebalance = true
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}
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}
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if rebalance {
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c.rebalance()
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}
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}
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}
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// rebalance removes dead shards from the Ring.
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func (c *ringShards) rebalance() {
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c.mu.RLock()
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shards := c.shards
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c.mu.RUnlock()
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liveShards := make([]string, 0, len(shards))
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for name, shard := range shards {
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if shard.IsUp() {
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liveShards = append(liveShards, name)
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}
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}
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hash := c.opt.NewConsistentHash(liveShards)
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c.mu.Lock()
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c.hash = hash
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c.numShard = len(liveShards)
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c.mu.Unlock()
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}
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func (c *ringShards) Len() int {
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c.mu.RLock()
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l := c.numShard
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c.mu.RUnlock()
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return l
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}
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func (c *ringShards) Close() error {
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c.mu.Lock()
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defer c.mu.Unlock()
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if c.closed {
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return nil
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}
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c.closed = true
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var firstErr error
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for _, shard := range c.shards {
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if err := shard.Client.Close(); err != nil && firstErr == nil {
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firstErr = err
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}
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}
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c.hash = nil
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c.shards = nil
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c.list = nil
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return firstErr
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}
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//------------------------------------------------------------------------------
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type ring struct {
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opt *RingOptions
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shards *ringShards
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cmdsInfoCache *cmdsInfoCache //nolint:structcheck
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}
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// Ring is a Redis client that uses consistent hashing to distribute
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// keys across multiple Redis servers (shards). It's safe for
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// concurrent use by multiple goroutines.
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//
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// Ring monitors the state of each shard and removes dead shards from
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// the ring. When a shard comes online it is added back to the ring. This
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// gives you maximum availability and partition tolerance, but no
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// consistency between different shards or even clients. Each client
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// uses shards that are available to the client and does not do any
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// coordination when shard state is changed.
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//
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// Ring should be used when you need multiple Redis servers for caching
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// and can tolerate losing data when one of the servers dies.
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// Otherwise you should use Redis Cluster.
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type Ring struct {
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*ring
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cmdable
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hooks
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ctx context.Context
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}
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func NewRing(opt *RingOptions) *Ring {
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opt.init()
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ring := Ring{
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ring: &ring{
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opt: opt,
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shards: newRingShards(opt),
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},
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ctx: context.Background(),
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}
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ring.cmdsInfoCache = newCmdsInfoCache(ring.cmdsInfo)
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ring.cmdable = ring.Process
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go ring.shards.Heartbeat(opt.HeartbeatFrequency)
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return &ring
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}
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func (c *Ring) Context() context.Context {
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return c.ctx
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}
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func (c *Ring) WithContext(ctx context.Context) *Ring {
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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.cmdable = clone.Process
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clone.hooks.lock()
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clone.ctx = ctx
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return &clone
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}
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// Do creates a Cmd from the args and processes the cmd.
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func (c *Ring) Do(ctx context.Context, args ...interface{}) *Cmd {
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cmd := NewCmd(ctx, args...)
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_ = c.Process(ctx, cmd)
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return cmd
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}
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func (c *Ring) Process(ctx context.Context, cmd Cmder) error {
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return c.hooks.process(ctx, cmd, c.process)
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}
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// Options returns read-only Options that were used to create the client.
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func (c *Ring) Options() *RingOptions {
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return c.opt
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}
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func (c *Ring) retryBackoff(attempt int) time.Duration {
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return internal.RetryBackoff(attempt, c.opt.MinRetryBackoff, c.opt.MaxRetryBackoff)
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}
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// PoolStats returns accumulated connection pool stats.
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func (c *Ring) PoolStats() *PoolStats {
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shards := c.shards.List()
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var acc PoolStats
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for _, shard := range shards {
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s := shard.Client.connPool.Stats()
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acc.Hits += s.Hits
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acc.Misses += s.Misses
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acc.Timeouts += s.Timeouts
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acc.TotalConns += s.TotalConns
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acc.IdleConns += s.IdleConns
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}
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return &acc
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}
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// Len returns the current number of shards in the ring.
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func (c *Ring) Len() int {
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return c.shards.Len()
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}
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// Subscribe subscribes the client to the specified channels.
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func (c *Ring) Subscribe(ctx context.Context, channels ...string) *PubSub {
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if len(channels) == 0 {
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panic("at least one channel is required")
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}
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shard, err := c.shards.GetByKey(channels[0])
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if err != nil {
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// TODO: return PubSub with sticky error
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panic(err)
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}
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return shard.Client.Subscribe(ctx, channels...)
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}
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// PSubscribe subscribes the client to the given patterns.
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func (c *Ring) PSubscribe(ctx context.Context, channels ...string) *PubSub {
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if len(channels) == 0 {
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panic("at least one channel is required")
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}
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shard, err := c.shards.GetByKey(channels[0])
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if err != nil {
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// TODO: return PubSub with sticky error
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panic(err)
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}
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return shard.Client.PSubscribe(ctx, channels...)
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}
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// ForEachShard concurrently calls the fn on each live shard in the ring.
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// It returns the first error if any.
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func (c *Ring) ForEachShard(
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ctx context.Context,
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fn func(ctx context.Context, client *Client) error,
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) error {
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shards := c.shards.List()
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var wg sync.WaitGroup
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errCh := make(chan error, 1)
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for _, shard := range shards {
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if shard.IsDown() {
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continue
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}
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wg.Add(1)
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go func(shard *ringShard) {
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defer wg.Done()
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err := fn(ctx, shard.Client)
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if err != nil {
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select {
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case errCh <- err:
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default:
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}
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}
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}(shard)
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}
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wg.Wait()
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select {
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case err := <-errCh:
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return err
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default:
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return nil
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}
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}
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func (c *Ring) cmdsInfo(ctx context.Context) (map[string]*CommandInfo, error) {
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shards := c.shards.List()
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var firstErr error
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for _, shard := range shards {
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cmdsInfo, err := shard.Client.Command(ctx).Result()
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if err == nil {
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return cmdsInfo, nil
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}
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if firstErr == nil {
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firstErr = err
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}
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}
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if firstErr == nil {
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return nil, errRingShardsDown
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}
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return nil, firstErr
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}
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func (c *Ring) cmdInfo(ctx context.Context, name string) *CommandInfo {
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cmdsInfo, err := c.cmdsInfoCache.Get(ctx)
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if err != nil {
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return nil
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}
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info := cmdsInfo[name]
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if info == nil {
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internal.Logger.Printf(c.Context(), "info for cmd=%s not found", name)
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}
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return info
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}
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func (c *Ring) cmdShard(ctx context.Context, cmd Cmder) (*ringShard, error) {
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cmdInfo := c.cmdInfo(ctx, cmd.Name())
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pos := cmdFirstKeyPos(cmd, cmdInfo)
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if pos == 0 {
|
|
return c.shards.Random()
|
|
}
|
|
firstKey := cmd.stringArg(pos)
|
|
return c.shards.GetByKey(firstKey)
|
|
}
|
|
|
|
func (c *Ring) process(ctx context.Context, cmd Cmder) error {
|
|
var lastErr error
|
|
for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
|
|
if attempt > 0 {
|
|
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
shard, err := c.cmdShard(ctx, cmd)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
lastErr = shard.Client.Process(ctx, cmd)
|
|
if lastErr == nil || !shouldRetry(lastErr, cmd.readTimeout() == nil) {
|
|
return lastErr
|
|
}
|
|
}
|
|
return lastErr
|
|
}
|
|
|
|
func (c *Ring) Pipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) {
|
|
return c.Pipeline().Pipelined(ctx, fn)
|
|
}
|
|
|
|
func (c *Ring) Pipeline() Pipeliner {
|
|
pipe := Pipeline{
|
|
ctx: c.ctx,
|
|
exec: c.processPipeline,
|
|
}
|
|
pipe.init()
|
|
return &pipe
|
|
}
|
|
|
|
func (c *Ring) processPipeline(ctx context.Context, cmds []Cmder) error {
|
|
return c.hooks.processPipeline(ctx, cmds, func(ctx context.Context, cmds []Cmder) error {
|
|
return c.generalProcessPipeline(ctx, cmds, false)
|
|
})
|
|
}
|
|
|
|
func (c *Ring) TxPipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) {
|
|
return c.TxPipeline().Pipelined(ctx, fn)
|
|
}
|
|
|
|
func (c *Ring) TxPipeline() Pipeliner {
|
|
pipe := Pipeline{
|
|
ctx: c.ctx,
|
|
exec: c.processTxPipeline,
|
|
}
|
|
pipe.init()
|
|
return &pipe
|
|
}
|
|
|
|
func (c *Ring) processTxPipeline(ctx context.Context, cmds []Cmder) error {
|
|
return c.hooks.processPipeline(ctx, cmds, func(ctx context.Context, cmds []Cmder) error {
|
|
return c.generalProcessPipeline(ctx, cmds, true)
|
|
})
|
|
}
|
|
|
|
func (c *Ring) generalProcessPipeline(
|
|
ctx context.Context, cmds []Cmder, tx bool,
|
|
) error {
|
|
cmdsMap := make(map[string][]Cmder)
|
|
for _, cmd := range cmds {
|
|
cmdInfo := c.cmdInfo(ctx, cmd.Name())
|
|
hash := cmd.stringArg(cmdFirstKeyPos(cmd, cmdInfo))
|
|
if hash != "" {
|
|
hash = c.shards.Hash(hash)
|
|
}
|
|
cmdsMap[hash] = append(cmdsMap[hash], cmd)
|
|
}
|
|
|
|
var wg sync.WaitGroup
|
|
for hash, cmds := range cmdsMap {
|
|
wg.Add(1)
|
|
go func(hash string, cmds []Cmder) {
|
|
defer wg.Done()
|
|
|
|
_ = c.processShardPipeline(ctx, hash, cmds, tx)
|
|
}(hash, cmds)
|
|
}
|
|
|
|
wg.Wait()
|
|
return cmdsFirstErr(cmds)
|
|
}
|
|
|
|
func (c *Ring) processShardPipeline(
|
|
ctx context.Context, hash string, cmds []Cmder, tx bool,
|
|
) error {
|
|
// TODO: retry?
|
|
shard, err := c.shards.GetByName(hash)
|
|
if err != nil {
|
|
setCmdsErr(cmds, err)
|
|
return err
|
|
}
|
|
|
|
if tx {
|
|
return shard.Client.processTxPipeline(ctx, cmds)
|
|
}
|
|
return shard.Client.processPipeline(ctx, cmds)
|
|
}
|
|
|
|
func (c *Ring) Watch(ctx context.Context, fn func(*Tx) error, keys ...string) error {
|
|
if len(keys) == 0 {
|
|
return fmt.Errorf("redis: Watch requires at least one key")
|
|
}
|
|
|
|
var shards []*ringShard
|
|
for _, key := range keys {
|
|
if key != "" {
|
|
shard, err := c.shards.GetByKey(hashtag.Key(key))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
shards = append(shards, shard)
|
|
}
|
|
}
|
|
|
|
if len(shards) == 0 {
|
|
return fmt.Errorf("redis: Watch requires at least one shard")
|
|
}
|
|
|
|
if len(shards) > 1 {
|
|
for _, shard := range shards[1:] {
|
|
if shard.Client != shards[0].Client {
|
|
err := fmt.Errorf("redis: Watch requires all keys to be in the same shard")
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
return shards[0].Client.Watch(ctx, fn, keys...)
|
|
}
|
|
|
|
// Close closes the ring client, releasing any open resources.
|
|
//
|
|
// It is rare to Close a Ring, as the Ring is meant to be long-lived
|
|
// and shared between many goroutines.
|
|
func (c *Ring) Close() error {
|
|
return c.shards.Close()
|
|
}
|