mirror of
https://github.com/go-gitea/gitea.git
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659 lines
14 KiB
Go
659 lines
14 KiB
Go
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package redis
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import (
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"context"
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"errors"
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"fmt"
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"math/rand"
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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/go-redis/redis/internal"
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"github.com/go-redis/redis/internal/consistenthash"
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"github.com/go-redis/redis/internal/hashtag"
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"github.com/go-redis/redis/internal/pool"
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)
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// Hash is type of hash function used in consistent hash.
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type Hash consistenthash.Hash
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var errRingShardsDown = errors.New("redis: all ring shards are down")
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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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// 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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// Hash function used in consistent hash.
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// Default is crc32.ChecksumIEEE.
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Hash Hash
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// Number of replicas in consistent hash.
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// Default is 100 replicas.
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//
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// Higher number of replicas will provide less deviation, that is keys will be
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// distributed to nodes more evenly.
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//
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// Following is deviation for common nreplicas:
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// --------------------------------------------------------
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// | nreplicas | standard error | 99% confidence interval |
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// | 10 | 0.3152 | (0.37, 1.98) |
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// | 100 | 0.0997 | (0.76, 1.28) |
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// | 1000 | 0.0316 | (0.92, 1.09) |
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// --------------------------------------------------------
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//
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// See https://arxiv.org/abs/1406.2294 for reference
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HashReplicas int
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// Following options are copied from Options struct.
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OnConnect func(*Conn) error
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DB int
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Password string
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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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}
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func (opt *RingOptions) init() {
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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.HashReplicas == 0 {
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opt.HashReplicas = 100
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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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OnConnect: opt.OnConnect,
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DB: opt.DB,
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Password: opt.Password,
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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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}
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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 (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.Map
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shards map[string]*ringShard // read only
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list []*ringShard // read only
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len int
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closed bool
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}
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func newRingShards(opt *RingOptions) *ringShards {
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return &ringShards{
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opt: opt,
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hash: newConsistentHash(opt),
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shards: make(map[string]*ringShard),
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}
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}
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func (c *ringShards) Add(name string, cl *Client) {
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shard := &ringShard{Client: cl}
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c.hash.Add(name)
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c.shards[name] = shard
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c.list = append(c.list, shard)
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}
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func (c *ringShards) List() []*ringShard {
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c.mu.RLock()
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list := c.list
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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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c.mu.RLock()
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hash := c.hash.Get(key)
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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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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) GetByHash(name string) (*ringShard, error) {
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if name == "" {
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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[name]
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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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for range ticker.C {
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var rebalance bool
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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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break
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}
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shards := c.list
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c.mu.RUnlock()
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for _, shard := range shards {
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err := shard.Client.Ping().Err()
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if shard.Vote(err == nil || err == pool.ErrPoolTimeout) {
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internal.Logf("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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hash := newConsistentHash(c.opt)
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var shardsNum int
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for name, shard := range c.shards {
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if shard.IsUp() {
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hash.Add(name)
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shardsNum++
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}
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}
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c.mu.Lock()
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c.hash = hash
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c.len = shardsNum
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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.len
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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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// 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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cmdable
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ctx context.Context
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opt *RingOptions
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shards *ringShards
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cmdsInfoCache *cmdsInfoCache
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process func(Cmder) error
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processPipeline func([]Cmder) error
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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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opt: opt,
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shards: newRingShards(opt),
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}
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ring.cmdsInfoCache = newCmdsInfoCache(ring.cmdsInfo)
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ring.process = ring.defaultProcess
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ring.processPipeline = ring.defaultProcessPipeline
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ring.cmdable.setProcessor(ring.Process)
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for name, addr := range opt.Addrs {
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clopt := opt.clientOptions()
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clopt.Addr = addr
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ring.shards.Add(name, NewClient(clopt))
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}
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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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if c.ctx != nil {
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return c.ctx
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}
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return context.Background()
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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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c2 := c.copy()
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c2.ctx = ctx
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return c2
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}
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func (c *Ring) copy() *Ring {
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cp := *c
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return &cp
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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(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(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(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(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(fn func(client *Client) error) 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(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() (map[string]*CommandInfo, error) {
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shards := c.shards.List()
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firstErr := errRingShardsDown
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for _, shard := range shards {
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cmdsInfo, err := shard.Client.Command().Result()
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if err == nil {
|
||
|
return cmdsInfo, nil
|
||
|
}
|
||
|
if firstErr == nil {
|
||
|
firstErr = err
|
||
|
}
|
||
|
}
|
||
|
return nil, firstErr
|
||
|
}
|
||
|
|
||
|
func (c *Ring) cmdInfo(name string) *CommandInfo {
|
||
|
cmdsInfo, err := c.cmdsInfoCache.Get()
|
||
|
if err != nil {
|
||
|
return nil
|
||
|
}
|
||
|
info := cmdsInfo[name]
|
||
|
if info == nil {
|
||
|
internal.Logf("info for cmd=%s not found", name)
|
||
|
}
|
||
|
return info
|
||
|
}
|
||
|
|
||
|
func (c *Ring) cmdShard(cmd Cmder) (*ringShard, error) {
|
||
|
cmdInfo := c.cmdInfo(cmd.Name())
|
||
|
pos := cmdFirstKeyPos(cmd, cmdInfo)
|
||
|
if pos == 0 {
|
||
|
return c.shards.Random()
|
||
|
}
|
||
|
firstKey := cmd.stringArg(pos)
|
||
|
return c.shards.GetByKey(firstKey)
|
||
|
}
|
||
|
|
||
|
// Do creates a Cmd from the args and processes the cmd.
|
||
|
func (c *Ring) Do(args ...interface{}) *Cmd {
|
||
|
cmd := NewCmd(args...)
|
||
|
c.Process(cmd)
|
||
|
return cmd
|
||
|
}
|
||
|
|
||
|
func (c *Ring) WrapProcess(
|
||
|
fn func(oldProcess func(cmd Cmder) error) func(cmd Cmder) error,
|
||
|
) {
|
||
|
c.process = fn(c.process)
|
||
|
}
|
||
|
|
||
|
func (c *Ring) Process(cmd Cmder) error {
|
||
|
return c.process(cmd)
|
||
|
}
|
||
|
|
||
|
func (c *Ring) defaultProcess(cmd Cmder) error {
|
||
|
for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
|
||
|
if attempt > 0 {
|
||
|
time.Sleep(c.retryBackoff(attempt))
|
||
|
}
|
||
|
|
||
|
shard, err := c.cmdShard(cmd)
|
||
|
if err != nil {
|
||
|
cmd.setErr(err)
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
err = shard.Client.Process(cmd)
|
||
|
if err == nil {
|
||
|
return nil
|
||
|
}
|
||
|
if !internal.IsRetryableError(err, cmd.readTimeout() == nil) {
|
||
|
return err
|
||
|
}
|
||
|
}
|
||
|
return cmd.Err()
|
||
|
}
|
||
|
|
||
|
func (c *Ring) Pipeline() Pipeliner {
|
||
|
pipe := Pipeline{
|
||
|
exec: c.processPipeline,
|
||
|
}
|
||
|
pipe.cmdable.setProcessor(pipe.Process)
|
||
|
return &pipe
|
||
|
}
|
||
|
|
||
|
func (c *Ring) Pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
|
||
|
return c.Pipeline().Pipelined(fn)
|
||
|
}
|
||
|
|
||
|
func (c *Ring) WrapProcessPipeline(
|
||
|
fn func(oldProcess func([]Cmder) error) func([]Cmder) error,
|
||
|
) {
|
||
|
c.processPipeline = fn(c.processPipeline)
|
||
|
}
|
||
|
|
||
|
func (c *Ring) defaultProcessPipeline(cmds []Cmder) error {
|
||
|
cmdsMap := make(map[string][]Cmder)
|
||
|
for _, cmd := range cmds {
|
||
|
cmdInfo := c.cmdInfo(cmd.Name())
|
||
|
hash := cmd.stringArg(cmdFirstKeyPos(cmd, cmdInfo))
|
||
|
if hash != "" {
|
||
|
hash = c.shards.Hash(hashtag.Key(hash))
|
||
|
}
|
||
|
cmdsMap[hash] = append(cmdsMap[hash], cmd)
|
||
|
}
|
||
|
|
||
|
for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
|
||
|
if attempt > 0 {
|
||
|
time.Sleep(c.retryBackoff(attempt))
|
||
|
}
|
||
|
|
||
|
var mu sync.Mutex
|
||
|
var failedCmdsMap map[string][]Cmder
|
||
|
var wg sync.WaitGroup
|
||
|
|
||
|
for hash, cmds := range cmdsMap {
|
||
|
wg.Add(1)
|
||
|
go func(hash string, cmds []Cmder) {
|
||
|
defer wg.Done()
|
||
|
|
||
|
shard, err := c.shards.GetByHash(hash)
|
||
|
if err != nil {
|
||
|
setCmdsErr(cmds, err)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
cn, err := shard.Client.getConn()
|
||
|
if err != nil {
|
||
|
setCmdsErr(cmds, err)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
canRetry, err := shard.Client.pipelineProcessCmds(cn, cmds)
|
||
|
shard.Client.releaseConnStrict(cn, err)
|
||
|
|
||
|
if canRetry && internal.IsRetryableError(err, true) {
|
||
|
mu.Lock()
|
||
|
if failedCmdsMap == nil {
|
||
|
failedCmdsMap = make(map[string][]Cmder)
|
||
|
}
|
||
|
failedCmdsMap[hash] = cmds
|
||
|
mu.Unlock()
|
||
|
}
|
||
|
}(hash, cmds)
|
||
|
}
|
||
|
|
||
|
wg.Wait()
|
||
|
if len(failedCmdsMap) == 0 {
|
||
|
break
|
||
|
}
|
||
|
cmdsMap = failedCmdsMap
|
||
|
}
|
||
|
|
||
|
return cmdsFirstErr(cmds)
|
||
|
}
|
||
|
|
||
|
func (c *Ring) TxPipeline() Pipeliner {
|
||
|
panic("not implemented")
|
||
|
}
|
||
|
|
||
|
func (c *Ring) TxPipelined(fn func(Pipeliner) error) ([]Cmder, error) {
|
||
|
panic("not implemented")
|
||
|
}
|
||
|
|
||
|
// 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()
|
||
|
}
|
||
|
|
||
|
func newConsistentHash(opt *RingOptions) *consistenthash.Map {
|
||
|
return consistenthash.New(opt.HashReplicas, consistenthash.Hash(opt.Hash))
|
||
|
}
|