pool

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README

go-redis-pool

Build Status Go Report Card Coverage Status GitHub release GitHub release date LICENSE GoDoc

go-redis-pool was designed to implement the read/write split in Redis master-slave mode, and easy way to sharding the data.

Installation

go-redis-pool requires a Go version with Modules support and uses import versioning. So please make sure to initialize a Go module before installing go-redis-pool:

go mod init github.com/my/repo
go get github.com/bitleak/go-redis-pool

Quick Start

API documentation and examples are available via godoc

Setup The Master-Slave Pool
pool, err := pool.NewHA(&pool.HAConfig{
        Master: "127.0.0.1:6379",
        Slaves: []string{
            "127.0.0.1:6380",
            "127.0.0.1:6381",
        },
        Password: "", // set master password
        ReadonlyPassword: "", // use password if no set
})

pool.Set("foo", "bar", 0)

The read-only commands would go throught slaves and write commands would into the master instance. We use the Round-Robin as default when determing which slave to serve the readonly request, and currently supports:

  • RoundRobin (default)
  • Random
  • Weight

For example, we change the distribution type to Weight:

pool, err := pool.NewHA(&pool.HAConfig{
        Master: "127.0.0.1:6379",
        Slaves: []string{
            "127.0.0.1:6380",  // default weight is 100 if missing
            "127.0.0.1:6381:200", // weight is 200
            "127.0.0.1:6382:300", // weigght is 300
        },
        PollType: pool.PollByWeight,
})

The first slave would serve 1/6 reqeusts, and second slave would serve 2/6, last one would serve 3/6.

Auto Eject The Failure Host
pool, err := pool.NewHA(&pool.HAConfig{
        Master: "127.0.0.1:6379",
        Slaves: []string{
            "127.0.0.1:6380",  // default weight is 100 if missing
            "127.0.0.1:6381:200", // weight is 200
            "127.0.0.1:6382:300", // weigght is 300
        },

        AutoEjectHost: true,
        ServerFailureLimit: 3,
        ServerRetryTimeout: 5 * time.Second,
        MinServerNum: 2,
})

The pool would evict the host if reached ServerFailureLimit times of failure and retry the host after ServerRetryTimeout. The MinServerNum was used to avoid evicting too many and would overrun other alive servers.

Setup The Sharding Pool
pool, err := pool.NewShard(&pool.ShardConfig{
    Shards: []*HAConfig {

        // shard 1
        &pool.HAConfig{
            Master: "127.0.0.1:6379",
            Slaves: []string{
                "127.0.0.1:6380",
                "127.0.0.1:6381",
            },
            Password: "", // set master password
            ReadonlyPassword: "", // use password if no set
        },

        // shard 2
        &pool.HAConfig{
            Master: "127.0.0.1:6382",
            Slaves: []string{
                "127.0.0.1:6383",
            },
            Password: "", // set master password
            ReadonlyPassword: "", // use password if no set
        },
    },
})

pool.Set("foo", "bar", 0)

Shard pool use the CRC32 as default hash function when sharding the key, you can overwrite the HashFn in config if wants to use other sharding hash function. The distribution type supports ketama and modular, default is modular.

Test

$ make test

See Also

https://github.com/go-redis/redis

Documentation

Index

Constants

View Source 
const (
	// PollByRandom selects the slave factory by random index
	PollByRandom = iota + 1
	// PollByWeight selects the slave factory by weight
	PollByWeight
	// PollByRoundRobin selects the slave with round-robin order
	PollByRoundRobin
)
View Source 
const (
	// DistributeByModular selects the sharding factory by modular
	DistributeByModular = iota + 1
	// DistributeByKetama selects the sharding factory by ketama consistent algorithm
	DistributeByKetama
)

Variables

This section is empty.

Functions

This section is empty.

Types

type ConnFactory 

type ConnFactory interface {
	// contains filtered or unexported methods
}

type HAConfig 

type HAConfig struct {
	Master           string         // the address of the master, e.g. "127.0.0.1:6379"
	Slaves           []string       // list of slaves, e.g. ["127.0.0.1:6379", "127.0.0.1:6380"]
	Password         string         // the password of the master
	ReadonlyPassword string         // the passsword of slaves
	Options          *redis.Options // redis options
	PollType         int            // the slave polling type

	AutoEjectHost      bool          // eject the failure host or not
	ServerFailureLimit int32         // eject if reached `ServerFailureLimit` times of failure
	ServerRetryTimeout time.Duration // retry the ejected host after `ServerRetryTimeout`
	MinServerNum       int           // reserved the min server
	// contains filtered or unexported fields
}

type HAConnFactory 

type HAConnFactory struct {
	// contains filtered or unexported fields
}

HAConnFactory impls the read/write splits between master and slaves

func NewHAConnFactory 

func NewHAConnFactory(cfg *HAConfig) (*HAConnFactory, error)

type Pool 

type Pool struct {
	// contains filtered or unexported fields
}

func NewHA 

func NewHA(cfg *HAConfig) (*Pool, error)

func NewShard 

func NewShard(cfg *ShardConfig) (*Pool, error)

func (*Pool) Append 

func (p *Pool) Append(key, value string) *redis.IntCmd

func (*Pool) BLPop 

func (p *Pool) BLPop(timeout time.Duration, keys ...string) *redis.StringSliceCmd

func (*Pool) BRPop 

func (p *Pool) BRPop(timeout time.Duration, keys ...string) *redis.StringSliceCmd

func (*Pool) BRPopLPush 

func (p *Pool) BRPopLPush(source, destination string, timeout time.Duration) *redis.StringCmd

func (*Pool) BitCount 

func (p *Pool) BitCount(key string, bitCount *redis.BitCount) *redis.IntCmd

func (*Pool) BitField 

func (p *Pool) BitField(key string, args ...interface{}) *redis.IntSliceCmd

func (*Pool) BitOp 

func (p *Pool) BitOp(op int, destKey string, keys ...string) *redis.IntCmd

func (*Pool) BitOpAnd 

func (p *Pool) BitOpAnd(destKey string, keys ...string) *redis.IntCmd

func (*Pool) BitOpNot 

func (p *Pool) BitOpNot(destKey string, key string) *redis.IntCmd

func (*Pool) BitOpOr 

func (p *Pool) BitOpOr(destKey string, keys ...string) *redis.IntCmd

func (*Pool) BitOpXor 

func (p *Pool) BitOpXor(destKey string, keys ...string) *redis.IntCmd

func (*Pool) BitPos 

func (p *Pool) BitPos(key string, bit int64, pos ...int64) *redis.IntCmd

func (*Pool) Close 

func (p *Pool) Close()

func (*Pool) DebugObject 

func (p *Pool) DebugObject(key string) *redis.StringCmd

func (*Pool) Decr 

func (p *Pool) Decr(key string) *redis.IntCmd

func (*Pool) DecrBy 

func (p *Pool) DecrBy(key string, decrement int64) *redis.IntCmd

func (*Pool) Del 

func (p *Pool) Del(keys ...string) (int64, error)

func (*Pool) Dump 

func (p *Pool) Dump(key string) *redis.StringCmd

func (*Pool) Echo 

func (p *Pool) Echo(message interface{}) *redis.StringCmd

func (*Pool) Eval 

func (p *Pool) Eval(script string, keys []string, args ...interface{}) *redis.Cmd

func (*Pool) EvalSha 

func (p *Pool) EvalSha(sha1 string, keys []string, args ...interface{}) *redis.Cmd

func (*Pool) Exists 

func (p *Pool) Exists(keys ...string) (int64, error)

func (*Pool) Expire 

func (p *Pool) Expire(key string, expiration time.Duration) *redis.BoolCmd

func (*Pool) ExpireAt 

func (p *Pool) ExpireAt(key string, tm time.Time) *redis.BoolCmd

func (*Pool) GeoAdd 

func (p *Pool) GeoAdd(key string, geoLocation ...*redis.GeoLocation) *redis.IntCmd

func (*Pool) GeoDist 

func (p *Pool) GeoDist(key string, member1, member2, unit string) *redis.FloatCmd

func (*Pool) GeoHash 

func (p *Pool) GeoHash(key string, members ...string) *redis.StringSliceCmd

func (*Pool) GeoPos 

func (p *Pool) GeoPos(key string, members ...string) *redis.GeoPosCmd

func (*Pool) GeoRadius 

func (p *Pool) GeoRadius(key string, longitude, latitude float64, query *redis.GeoRadiusQuery) *redis.GeoLocationCmd

func (*Pool) GeoRadiusByMember 

func (p *Pool) GeoRadiusByMember(key, member string, query *redis.GeoRadiusQuery) *redis.GeoLocationCmd

func (*Pool) GeoRadiusByMemberStore 

func (p *Pool) GeoRadiusByMemberStore(key, member string, query *redis.GeoRadiusQuery) *redis.IntCmd

func (*Pool) GeoRadiusStore 

func (p *Pool) GeoRadiusStore(key string, longitude, latitude float64, query *redis.GeoRadiusQuery) *redis.IntCmd

func (*Pool) Get 

func (p *Pool) Get(key string) *redis.StringCmd

func (*Pool) GetBit 

func (p *Pool) GetBit(key string, offset int64) *redis.IntCmd

func (*Pool) GetRange 

func (p *Pool) GetRange(key string, start, end int64) *redis.StringCmd

func (*Pool) GetSet 

func (p *Pool) GetSet(key string, value interface{}) *redis.StringCmd

func (*Pool) HDel 

func (p *Pool) HDel(key string, fields ...string) *redis.IntCmd

func (*Pool) HExists 

func (p *Pool) HExists(key, field string) *redis.BoolCmd

func (*Pool) HGet 

func (p *Pool) HGet(key, field string) *redis.StringCmd

func (*Pool) HGetAll 

func (p *Pool) HGetAll(key string) *redis.StringStringMapCmd

func (*Pool) HIncrBy 

func (p *Pool) HIncrBy(key, field string, incr int64) *redis.IntCmd

func (*Pool) HIncrByFloat 

func (p *Pool) HIncrByFloat(key, field string, incr float64) *redis.FloatCmd

func (*Pool) HKeys 

func (p *Pool) HKeys(key string) *redis.StringSliceCmd

func (*Pool) HLen 

func (p *Pool) HLen(key string) *redis.IntCmd

func (*Pool) HMGet 

func (p *Pool) HMGet(key string, fields ...string) *redis.SliceCmd

func (*Pool) HMSet 

func (p *Pool) HMSet(key string, values ...interface{}) *redis.BoolCmd

func (*Pool) HScan 

func (p *Pool) HScan(key string, cursor uint64, match string, count int64) *redis.ScanCmd

func (*Pool) HSet 

func (p *Pool) HSet(key, field string, value interface{}) *redis.IntCmd

func (*Pool) HSetNX 

func (p *Pool) HSetNX(key, field string, value interface{}) *redis.BoolCmd

func (*Pool) HVals 

func (p *Pool) HVals(key string) *redis.StringSliceCmd

func (*Pool) Incr 

func (p *Pool) Incr(key string) *redis.IntCmd

func (*Pool) IncrBy 

func (p *Pool) IncrBy(key string, increment int64) *redis.IntCmd

func (*Pool) IncrByFloat 

func (p *Pool) IncrByFloat(key string, value float64) *redis.FloatCmd

func (*Pool) LIndex 

func (p *Pool) LIndex(key string, index int64) *redis.StringCmd

func (*Pool) LInsert 

func (p *Pool) LInsert(key, op string, pivot, value interface{}) *redis.IntCmd

func (*Pool) LInsertAfter 

func (p *Pool) LInsertAfter(key string, pivot, value interface{}) *redis.IntCmd

func (*Pool) LInsertBefore 

func (p *Pool) LInsertBefore(key string, pivot, value interface{}) *redis.IntCmd

func (*Pool) LLen 

func (p *Pool) LLen(key string) *redis.IntCmd

func (*Pool) LPop 

func (p *Pool) LPop(key string) *redis.StringCmd

func (*Pool) LPush 

func (p *Pool) LPush(key string, values ...interface{}) *redis.IntCmd

func (*Pool) LPushX 

func (p *Pool) LPushX(key string, values ...interface{}) *redis.IntCmd

func (*Pool) LRange 

func (p *Pool) LRange(key string, start, stop int64) *redis.StringSliceCmd

func (*Pool) LRem 

func (p *Pool) LRem(key string, count int64, value interface{}) *redis.IntCmd

func (*Pool) LSet 

func (p *Pool) LSet(key string, index int64, value interface{}) *redis.StatusCmd

func (*Pool) LTrim 

func (p *Pool) LTrim(key string, start, stop int64) *redis.StatusCmd

func (*Pool) MGet 

func (p *Pool) MGet(keys ...string) ([]interface{}, error)

func (*Pool) MSet 

func (p *Pool) MSet(values ...interface{}) *redis.StatusCmd

MSet is like Set but accepts multiple values:

  • MSet("key1", "value1", "key2", "value2")
  • MSet([]string{"key1", "value1", "key2", "value2"})
  • MSet(map[string]interface{}{"key1": "value1", "key2": "value2"})

func (*Pool) MSetNX 

func (p *Pool) MSetNX(values ...interface{}) *redis.BoolCmd

MSetNX is like SetNX but accepts multiple values:

  • MSetNX("key1", "value1", "key2", "value2")
  • MSetNX([]string{"key1", "value1", "key2", "value2"})
  • MSetNX(map[string]interface{}{"key1": "value1", "key2": "value2"})

func (*Pool) MemoryUsage 

func (p *Pool) MemoryUsage(key string, samples ...int) *redis.IntCmd

func (*Pool) ObjectEncoding 

func (p *Pool) ObjectEncoding(key string) *redis.StringCmd

func (*Pool) ObjectIdleTime 

func (p *Pool) ObjectIdleTime(key string) *redis.DurationCmd

func (*Pool) ObjectRefCount 

func (p *Pool) ObjectRefCount(key string) *redis.IntCmd

func (*Pool) PFAdd 

func (p *Pool) PFAdd(key string, els ...interface{}) *redis.IntCmd

func (*Pool) PFCount 

func (p *Pool) PFCount(keys ...string) *redis.IntCmd

func (*Pool) PFMerge 

func (p *Pool) PFMerge(dest string, keys ...string) *redis.StatusCmd

func (*Pool) Ping 

func (p *Pool) Ping() *redis.StatusCmd

func (*Pool) Pipeline 

func (p *Pool) Pipeline() (redis.Pipeliner, error)

func (*Pool) Pipelined 

func (p *Pool) Pipelined(fn func(redis.Pipeliner) error) ([]redis.Cmder, error)

func (*Pool) PubSubChannels 

func (p *Pool) PubSubChannels(pattern string) *redis.StringSliceCmd

func (*Pool) PubSubNumPat 

func (p *Pool) PubSubNumPat() *redis.IntCmd

func (*Pool) PubSubNumSub 

func (p *Pool) PubSubNumSub(channels ...string) *redis.StringIntMapCmd

func (*Pool) Publish 

func (p *Pool) Publish(channel string, message interface{}) *(redis.IntCmd)

func (*Pool) RPop 

func (p *Pool) RPop(key string) *redis.StringCmd

func (*Pool) RPopLPush 

func (p *Pool) RPopLPush(source, destination string) *redis.StringCmd

func (*Pool) RPush 

func (p *Pool) RPush(key string, values ...interface{}) *redis.IntCmd

func (*Pool) RPushX 

func (p *Pool) RPushX(key string, values ...interface{}) *redis.IntCmd

func (*Pool) Rename 

func (p *Pool) Rename(key, newkey string) *redis.StatusCmd

func (*Pool) RenameNX 

func (p *Pool) RenameNX(key, newkey string) *redis.BoolCmd

func (*Pool) SAdd 

func (p *Pool) SAdd(key string, members ...interface{}) *redis.IntCmd

func (*Pool) SCard 

func (p *Pool) SCard(key string) *redis.IntCmd

func (*Pool) SDiff 

func (p *Pool) SDiff(keys ...string) *redis.StringSliceCmd

func (*Pool) SDiffStore 

func (p *Pool) SDiffStore(destination string, keys ...string) *redis.IntCmd

func (*Pool) SInter 

func (p *Pool) SInter(keys ...string) *redis.StringSliceCmd

func (*Pool) SInterStore 

func (p *Pool) SInterStore(destination string, keys ...string) *redis.IntCmd

func (*Pool) SIsMember 

func (p *Pool) SIsMember(key string, member interface{}) *redis.BoolCmd

func (*Pool) SMembers 

func (p *Pool) SMembers(key string) *redis.StringSliceCmd

func (*Pool) SMembersMap 

func (p *Pool) SMembersMap(key string) *redis.StringStructMapCmd

func (*Pool) SMove 

func (p *Pool) SMove(source, destination string, member interface{}) *redis.BoolCmd

func (*Pool) SPop 

func (p *Pool) SPop(key string) *redis.StringCmd

func (*Pool) SPopN 

func (p *Pool) SPopN(key string, count int64) *redis.StringSliceCmd

func (*Pool) SRandMember 

func (p *Pool) SRandMember(key string) *redis.StringCmd

func (*Pool) SRandMemberN 

func (p *Pool) SRandMemberN(key string, count int64) *redis.StringSliceCmd

func (*Pool) SRem 

func (p *Pool) SRem(key string, members ...interface{}) *redis.IntCmd

func (*Pool) SScan 

func (p *Pool) SScan(key string, cursor uint64, match string, count int64) *redis.ScanCmd

func (*Pool) SUnion 

func (p *Pool) SUnion(keys ...string) *redis.StringSliceCmd

func (*Pool) SUnionStore 

func (p *Pool) SUnionStore(destination string, keys ...string) *redis.IntCmd

func (*Pool) Scan 

func (p *Pool) Scan(cursor uint64, match string, count int64) *redis.ScanCmd

func (*Pool) ScriptExists 

func (p *Pool) ScriptExists(hashes ...string) *redis.BoolSliceCmd

func (*Pool) ScriptFlush 

func (p *Pool) ScriptFlush() *redis.StatusCmd

func (*Pool) ScriptKill 

func (p *Pool) ScriptKill() *redis.StatusCmd

func (*Pool) ScriptLoad 

func (p *Pool) ScriptLoad(script string) *redis.StringCmd

func (*Pool) Set 

func (p *Pool) Set(key string, value interface{}, expiration time.Duration) *redis.StatusCmd

func (*Pool) SetBit 

func (p *Pool) SetBit(key string, offset int64, value int) *redis.IntCmd

func (*Pool) SetNX 

func (p *Pool) SetNX(key string, value interface{}, expiration time.Duration) *redis.BoolCmd

func (*Pool) SetRange 

func (p *Pool) SetRange(key string, offset int64, value string) *redis.IntCmd

func (*Pool) SetXX 

func (p *Pool) SetXX(key string, value interface{}, expiration time.Duration) *redis.BoolCmd

func (*Pool) Sort 

func (p *Pool) Sort(key string, sort *redis.Sort) *redis.StringSliceCmd

func (*Pool) SortInterfaces 

func (p *Pool) SortInterfaces(key string, sort *redis.Sort) *redis.SliceCmd

func (*Pool) SortStore 

func (p *Pool) SortStore(key, store string, sort *redis.Sort) *redis.IntCmd

func (*Pool) StrLen 

func (p *Pool) StrLen(key string) *redis.IntCmd

func (*Pool) TTL 

func (p *Pool) TTL(key string) *redis.DurationCmd

func (*Pool) Touch 

func (p *Pool) Touch(keys ...string) (int64, error)

func (*Pool) TxPipeline 

func (p *Pool) TxPipeline() (redis.Pipeliner, error)

func (*Pool) TxPipelined 

func (p *Pool) TxPipelined(fn func(redis.Pipeliner) error) ([]redis.Cmder, error)

func (*Pool) Type 

func (p *Pool) Type(key string) *redis.StatusCmd
func (p *Pool) Unlink(keys ...string) (int64, error)

func (*Pool) WithMaster 

func (p *Pool) WithMaster(key ...string) (*redis.Client, error)

func (*Pool) ZAdd 

func (p *Pool) ZAdd(key string, members ...*redis.Z) *redis.IntCmd

func (*Pool) ZAddCh 

func (p *Pool) ZAddCh(key string, members ...*redis.Z) *redis.IntCmd

func (*Pool) ZAddNX 

func (p *Pool) ZAddNX(key string, members ...*redis.Z) *redis.IntCmd

func (*Pool) ZAddNXCh 

func (p *Pool) ZAddNXCh(key string, members ...*redis.Z) *redis.IntCmd

func (*Pool) ZAddXX 

func (p *Pool) ZAddXX(key string, members ...*redis.Z) *redis.IntCmd

func (*Pool) ZAddXXCh 

func (p *Pool) ZAddXXCh(key string, members ...*redis.Z) *redis.IntCmd

func (*Pool) ZCard 

func (p *Pool) ZCard(key string) *redis.IntCmd

func (*Pool) ZCount 

func (p *Pool) ZCount(key, min, max string) *redis.IntCmd

func (*Pool) ZIncr 

func (p *Pool) ZIncr(key string, member *redis.Z) *redis.FloatCmd

func (*Pool) ZIncrBy 

func (p *Pool) ZIncrBy(key string, increment float64, member string) *redis.FloatCmd

func (*Pool) ZIncrNX 

func (p *Pool) ZIncrNX(key string, member *redis.Z) *redis.FloatCmd

func (*Pool) ZIncrXX 

func (p *Pool) ZIncrXX(key string, member *redis.Z) *redis.FloatCmd

func (*Pool) ZInterStore 

func (p *Pool) ZInterStore(destination string, store *redis.ZStore) *redis.IntCmd

func (*Pool) ZLexCount 

func (p *Pool) ZLexCount(key, min, max string) *redis.IntCmd

func (*Pool) ZPopMax 

func (p *Pool) ZPopMax(key string, count ...int64) *redis.ZSliceCmd

func (*Pool) ZPopMin 

func (p *Pool) ZPopMin(key string, count ...int64) *redis.ZSliceCmd

func (*Pool) ZRange 

func (p *Pool) ZRange(key string, start, stop int64) *redis.StringSliceCmd

func (*Pool) ZRangeByLex 

func (p *Pool) ZRangeByLex(key string, opt *redis.ZRangeBy) *redis.StringSliceCmd

func (*Pool) ZRangeByScore 

func (p *Pool) ZRangeByScore(key string, opt *redis.ZRangeBy) *redis.StringSliceCmd

func (*Pool) ZRangeByScoreWithScores 

func (p *Pool) ZRangeByScoreWithScores(key string, opt *redis.ZRangeBy) *redis.ZSliceCmd

func (*Pool) ZRangeWithScores 

func (p *Pool) ZRangeWithScores(key string, start, stop int64) *redis.ZSliceCmd

func (*Pool) ZRank 

func (p *Pool) ZRank(key, member string) *redis.IntCmd

func (*Pool) ZRem 

func (p *Pool) ZRem(key string, members ...interface{}) *redis.IntCmd

func (*Pool) ZRemRangeByLex 

func (p *Pool) ZRemRangeByLex(key, min, max string) *redis.IntCmd

func (*Pool) ZRemRangeByRank 

func (p *Pool) ZRemRangeByRank(key string, start, stop int64) *redis.IntCmd

func (*Pool) ZRemRangeByScore 

func (p *Pool) ZRemRangeByScore(key, min, max string) *redis.IntCmd

func (*Pool) ZRevRange 

func (p *Pool) ZRevRange(key string, start, stop int64) *redis.StringSliceCmd

func (*Pool) ZRevRangeByLex 

func (p *Pool) ZRevRangeByLex(key string, opt *redis.ZRangeBy) *redis.StringSliceCmd

func (*Pool) ZRevRangeByScore 

func (p *Pool) ZRevRangeByScore(key string, opt *redis.ZRangeBy) *redis.StringSliceCmd

func (*Pool) ZRevRangeByScoreWithScores 

func (p *Pool) ZRevRangeByScoreWithScores(key string, opt *redis.ZRangeBy) *redis.ZSliceCmd

func (*Pool) ZRevRangeWithScores 

func (p *Pool) ZRevRangeWithScores(key string, start, stop int64) *redis.ZSliceCmd

func (*Pool) ZRevRank 

func (p *Pool) ZRevRank(key, member string) *redis.IntCmd

func (*Pool) ZScan 

func (p *Pool) ZScan(key string, cursor uint64, match string, count int64) *redis.ScanCmd

func (*Pool) ZScore 

func (p *Pool) ZScore(key, member string) *redis.FloatCmd

func (*Pool) ZUnionStore 

func (p *Pool) ZUnionStore(dest string, store *redis.ZStore) *redis.IntCmd

type ShardConfig 

type ShardConfig struct {
	Shards         []*HAConfig
	DistributeType int // distribution type of the shards, supports `DistributeByModular` or `DistributeByKetama`
	HashFn         func(key []byte) uint32
}

type ShardConnFactory 

type ShardConnFactory struct {
	// contains filtered or unexported fields
}

func NewShardConnFactory 

func NewShardConnFactory(cfg *ShardConfig) (*ShardConnFactory, error)

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