andrewarrow / rock

Redis Orchestration of Cluster Konnections

rock

Redis Orchestration of Cluster Konnections

ip := os.Getenv("REDIS_CLUSTER_IP")
port := os.Getenv("REDIS_CLUSTER_PORT")
poolSize := 2
c := cluster.NewClient(poolSize, ip, port)
c.ConnectAll()
r := c.Info()
fmt.Println(r)
c.Set("test", "foo")
c.Get("test")

why not goredis

I could not get goredis poolsize configs to work for me. This is a very simple thread-safe redis cluster client.

how it works

type Client struct {
	mu          sync.Mutex
	rip         string
	connections []*ClientConnection
}

A client has a pool of N *ClientConnections.

type ClientConnection struct {
	hosts  map[string]net.Conn
	target string
	buffer []byte
}

Each ClientConnection has a map of redis node hostname+port and the current "target" it just connected to after the last MOV.

For example:

hosts["127.0.0.1:30001"] = conn1
hosts["127.0.0.1:30002"] = conn2

When it gets a MOV response with 127.0.0.1:30003 and 127.0.0.1:30003 is not in the map of hosts, it will connect and add it:

hosts["127.0.0.1:30003"] = conn3

calling commands

You can make calls like:

c.Set("test", "foo")
c.Get("test")
c.SAdd("foo", "bar")
c.SMembers("foo")
c.SRem("foo", "bar")

And they are thread safe because;

cc := c.TakeFromPool()
defer c.PlaceBackInPool(cc)

Before each command it gets its own ClientConnection from the pool and is the only one using that ClientConnection until it returns it.