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cluster.go
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cluster.go
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package redis
import (
"fmt"
"math/rand"
"sync"
"sync/atomic"
"time"
"github.com/go-redis/redis/internal"
"github.com/go-redis/redis/internal/hashtag"
"github.com/go-redis/redis/internal/pool"
"github.com/go-redis/redis/internal/proto"
)
var errClusterNoNodes = internal.RedisError("redis: cluster has no nodes")
var errNilClusterState = internal.RedisError("redis: cannot load cluster slots")
// ClusterOptions are used to configure a cluster client and should be
// passed to NewClusterClient.
type ClusterOptions struct {
// A seed list of host:port addresses of cluster nodes.
Addrs []string
// The maximum number of retries before giving up. Command is retried
// on network errors and MOVED/ASK redirects.
// Default is 16.
MaxRedirects int
// Enables read queries for a connection to a Redis Cluster slave node.
ReadOnly bool
// Enables routing read-only queries to the closest master or slave node.
RouteByLatency bool
// Following options are copied from Options struct.
MaxRetries int
Password string
DialTimeout time.Duration
ReadTimeout time.Duration
WriteTimeout time.Duration
// PoolSize applies per cluster node and not for the whole cluster.
PoolSize int
PoolTimeout time.Duration
IdleTimeout time.Duration
IdleCheckFrequency time.Duration
}
func (opt *ClusterOptions) init() {
if opt.MaxRedirects == -1 {
opt.MaxRedirects = 0
} else if opt.MaxRedirects == 0 {
opt.MaxRedirects = 16
}
if opt.RouteByLatency {
opt.ReadOnly = true
}
}
func (opt *ClusterOptions) clientOptions() *Options {
const disableIdleCheck = -1
return &Options{
MaxRetries: opt.MaxRetries,
Password: opt.Password,
ReadOnly: opt.ReadOnly,
DialTimeout: opt.DialTimeout,
ReadTimeout: opt.ReadTimeout,
WriteTimeout: opt.WriteTimeout,
PoolSize: opt.PoolSize,
PoolTimeout: opt.PoolTimeout,
IdleTimeout: opt.IdleTimeout,
// IdleCheckFrequency is not copied to disable reaper
IdleCheckFrequency: disableIdleCheck,
}
}
//------------------------------------------------------------------------------
type clusterNode struct {
Client *Client
Latency time.Duration
loading time.Time
}
func newClusterNode(clOpt *ClusterOptions, addr string) *clusterNode {
opt := clOpt.clientOptions()
opt.Addr = addr
node := clusterNode{
Client: NewClient(opt),
}
if clOpt.RouteByLatency {
node.updateLatency()
}
return &node
}
func (n *clusterNode) updateLatency() {
const probes = 10
for i := 0; i < probes; i++ {
start := time.Now()
n.Client.Ping()
n.Latency += time.Since(start)
}
n.Latency = n.Latency / probes
}
func (n *clusterNode) Loading() bool {
return !n.loading.IsZero() && time.Since(n.loading) < time.Minute
}
//------------------------------------------------------------------------------
type clusterNodes struct {
opt *ClusterOptions
mu sync.RWMutex
addrs []string
nodes map[string]*clusterNode
closed bool
}
func newClusterNodes(opt *ClusterOptions) *clusterNodes {
return &clusterNodes{
opt: opt,
nodes: make(map[string]*clusterNode),
}
}
func (c *clusterNodes) Close() error {
c.mu.Lock()
defer c.mu.Unlock()
if c.closed {
return nil
}
c.closed = true
var firstErr error
for _, node := range c.nodes {
if err := node.Client.Close(); err != nil && firstErr == nil {
firstErr = err
}
}
c.addrs = nil
c.nodes = nil
return firstErr
}
func (c *clusterNodes) All() ([]*clusterNode, error) {
c.mu.RLock()
defer c.mu.RUnlock()
if c.closed {
return nil, pool.ErrClosed
}
nodes := make([]*clusterNode, 0, len(c.nodes))
for _, node := range c.nodes {
nodes = append(nodes, node)
}
return nodes, nil
}
func (c *clusterNodes) Get(addr string) (*clusterNode, error) {
var node *clusterNode
var ok bool
c.mu.RLock()
if !c.closed {
node, ok = c.nodes[addr]
}
c.mu.RUnlock()
if ok {
return node, nil
}
c.mu.Lock()
defer c.mu.Unlock()
if c.closed {
return nil, pool.ErrClosed
}
node, ok = c.nodes[addr]
if ok {
return node, nil
}
c.addrs = append(c.addrs, addr)
node = newClusterNode(c.opt, addr)
c.nodes[addr] = node
return node, nil
}
func (c *clusterNodes) Random() (*clusterNode, error) {
c.mu.RLock()
closed := c.closed
addrs := c.addrs
c.mu.RUnlock()
if closed {
return nil, pool.ErrClosed
}
if len(addrs) == 0 {
return nil, errClusterNoNodes
}
var nodeErr error
for i := 0; i <= c.opt.MaxRedirects; i++ {
n := rand.Intn(len(addrs))
node, err := c.Get(addrs[n])
if err != nil {
return nil, err
}
nodeErr = node.Client.ClusterInfo().Err()
if nodeErr == nil {
return node, nil
}
}
return nil, nodeErr
}
//------------------------------------------------------------------------------
type clusterState struct {
nodes *clusterNodes
slots [][]*clusterNode
}
func newClusterState(nodes *clusterNodes, slots []ClusterSlot) (*clusterState, error) {
c := clusterState{
nodes: nodes,
slots: make([][]*clusterNode, hashtag.SlotNumber),
}
for _, slot := range slots {
var nodes []*clusterNode
for _, slotNode := range slot.Nodes {
node, err := c.nodes.Get(slotNode.Addr)
if err != nil {
return nil, err
}
nodes = append(nodes, node)
}
for i := slot.Start; i <= slot.End; i++ {
c.slots[i] = nodes
}
}
return &c, nil
}
func (c *clusterState) slotMasterNode(slot int) (*clusterNode, error) {
nodes := c.slotNodes(slot)
if len(nodes) > 0 {
return nodes[0], nil
}
return c.nodes.Random()
}
func (c *clusterState) slotSlaveNode(slot int) (*clusterNode, error) {
nodes := c.slotNodes(slot)
switch len(nodes) {
case 0:
return c.nodes.Random()
case 1:
return nodes[0], nil
case 2:
if slave := nodes[1]; !slave.Loading() {
return slave, nil
}
return nodes[0], nil
default:
var slave *clusterNode
for i := 0; i < 10; i++ {
n := rand.Intn(len(nodes)-1) + 1
slave = nodes[n]
if !slave.Loading() {
break
}
}
return slave, nil
}
}
func (c *clusterState) slotClosestNode(slot int) (*clusterNode, error) {
const threshold = time.Millisecond
nodes := c.slotNodes(slot)
if len(nodes) == 0 {
return c.nodes.Random()
}
var node *clusterNode
for _, n := range nodes {
if n.Loading() {
continue
}
if node == nil || node.Latency-n.Latency > threshold {
node = n
}
}
return node, nil
}
func (c *clusterState) slotNodes(slot int) []*clusterNode {
if slot < len(c.slots) {
return c.slots[slot]
}
return nil
}
//------------------------------------------------------------------------------
// ClusterClient is a Redis Cluster client representing a pool of zero
// or more underlying connections. It's safe for concurrent use by
// multiple goroutines.
type ClusterClient struct {
cmdable
opt *ClusterOptions
cmds map[string]*CommandInfo
nodes *clusterNodes
_state atomic.Value
// Reports where slots reloading is in progress.
reloading uint32
}
// NewClusterClient returns a Redis Cluster client as described in
// http://redis.io/topics/cluster-spec.
func NewClusterClient(opt *ClusterOptions) *ClusterClient {
opt.init()
c := &ClusterClient{
opt: opt,
nodes: newClusterNodes(opt),
}
c.cmdable.process = c.Process
// Add initial nodes.
for _, addr := range opt.Addrs {
_, _ = c.nodes.Get(addr)
}
// Preload cluster slots.
for i := 0; i < 10; i++ {
state, err := c.reloadSlots()
if err == nil {
c._state.Store(state)
break
}
}
if opt.IdleCheckFrequency > 0 {
go c.reaper(opt.IdleCheckFrequency)
}
return c
}
// Options returns read-only Options that were used to create the client.
func (c *ClusterClient) Options() *ClusterOptions {
return c.opt
}
func (c *ClusterClient) state() *clusterState {
v := c._state.Load()
if v != nil {
return v.(*clusterState)
}
c.lazyReloadSlots()
return nil
}
func (c *ClusterClient) cmdSlotAndNode(state *clusterState, cmd Cmder) (int, *clusterNode, error) {
if state == nil {
node, err := c.nodes.Random()
return 0, node, err
}
cmdInfo := c.cmds[cmd.name()]
firstKey := cmd.arg(cmdFirstKeyPos(cmd, cmdInfo))
slot := hashtag.Slot(firstKey)
if cmdInfo != nil && cmdInfo.ReadOnly && c.opt.ReadOnly {
if c.opt.RouteByLatency {
node, err := state.slotClosestNode(slot)
return slot, node, err
}
node, err := state.slotSlaveNode(slot)
return slot, node, err
}
node, err := state.slotMasterNode(slot)
return slot, node, err
}
func (c *ClusterClient) Watch(fn func(*Tx) error, keys ...string) error {
state := c.state()
var node *clusterNode
var err error
if state != nil && len(keys) > 0 {
node, err = state.slotMasterNode(hashtag.Slot(keys[0]))
} else {
node, err = c.nodes.Random()
}
if err != nil {
return err
}
return node.Client.Watch(fn, keys...)
}
// Close closes the cluster client, releasing any open resources.
//
// It is rare to Close a ClusterClient, as the ClusterClient is meant
// to be long-lived and shared between many goroutines.
func (c *ClusterClient) Close() error {
return c.nodes.Close()
}
func (c *ClusterClient) Process(cmd Cmder) error {
slot, node, err := c.cmdSlotAndNode(c.state(), cmd)
if err != nil {
cmd.setErr(err)
return err
}
var ask bool
for attempt := 0; attempt <= c.opt.MaxRedirects; attempt++ {
if ask {
pipe := node.Client.Pipeline()
pipe.Process(NewCmd("ASKING"))
pipe.Process(cmd)
_, err = pipe.Exec()
pipe.Close()
ask = false
} else {
err = node.Client.Process(cmd)
}
// If there is no (real) error - we are done.
if err == nil {
return nil
}
// If slave is loading - read from master.
if c.opt.ReadOnly && internal.IsLoadingError(err) {
node.loading = time.Now()
continue
}
// On network errors try random node.
if internal.IsRetryableError(err) {
node, err = c.nodes.Random()
if err != nil {
cmd.setErr(err)
return err
}
continue
}
var moved bool
var addr string
moved, ask, addr = internal.IsMovedError(err)
if moved || ask {
state := c.state()
if state != nil && slot >= 0 {
master, _ := state.slotMasterNode(slot)
if moved && (master == nil || master.Client.getAddr() != addr) {
c.lazyReloadSlots()
}
}
node, err = c.nodes.Get(addr)
if err != nil {
cmd.setErr(err)
return err
}
continue
}
break
}
return cmd.Err()
}
// ForEachNode concurrently calls the fn on each ever known node in the cluster.
// It returns the first error if any.
func (c *ClusterClient) ForEachNode(fn func(client *Client) error) error {
nodes, err := c.nodes.All()
if err != nil {
return err
}
var wg sync.WaitGroup
errCh := make(chan error, 1)
for _, node := range nodes {
wg.Add(1)
go func(node *clusterNode) {
defer wg.Done()
err := fn(node.Client)
if err != nil {
select {
case errCh <- err:
default:
}
}
}(node)
}
wg.Wait()
select {
case err := <-errCh:
return err
default:
return nil
}
}
// ForEachMaster concurrently calls the fn on each master node in the cluster.
// It returns the first error if any.
func (c *ClusterClient) ForEachMaster(fn func(client *Client) error) error {
state := c.state()
if state == nil {
return errNilClusterState
}
var wg sync.WaitGroup
visited := make(map[*clusterNode]struct{})
errCh := make(chan error, 1)
for _, nodes := range state.slots {
if len(nodes) == 0 {
continue
}
master := nodes[0]
if _, ok := visited[master]; ok {
continue
}
visited[master] = struct{}{}
wg.Add(1)
go func(node *clusterNode) {
defer wg.Done()
err := fn(node.Client)
if err != nil {
select {
case errCh <- err:
default:
}
}
}(master)
}
wg.Wait()
select {
case err := <-errCh:
return err
default:
return nil
}
}
// PoolStats returns accumulated connection pool stats.
func (c *ClusterClient) PoolStats() *PoolStats {
var acc PoolStats
nodes, err := c.nodes.All()
if err != nil {
return &acc
}
for _, node := range nodes {
s := node.Client.connPool.Stats()
acc.Requests += s.Requests
acc.Hits += s.Hits
acc.Timeouts += s.Timeouts
acc.TotalConns += s.TotalConns
acc.FreeConns += s.FreeConns
}
return &acc
}
func (c *ClusterClient) lazyReloadSlots() {
if !atomic.CompareAndSwapUint32(&c.reloading, 0, 1) {
return
}
go func() {
for i := 0; i < 1000; i++ {
state, err := c.reloadSlots()
if err == pool.ErrClosed {
break
}
if err == nil {
c._state.Store(state)
break
}
time.Sleep(time.Millisecond)
}
time.Sleep(3 * time.Second)
atomic.StoreUint32(&c.reloading, 0)
}()
}
func (c *ClusterClient) reloadSlots() (*clusterState, error) {
node, err := c.nodes.Random()
if err != nil {
return nil, err
}
// TODO: fix race
if c.cmds == nil {
cmds, err := node.Client.Command().Result()
if err != nil {
return nil, err
}
c.cmds = cmds
}
slots, err := node.Client.ClusterSlots().Result()
if err != nil {
return nil, err
}
return newClusterState(c.nodes, slots)
}
// reaper closes idle connections to the cluster.
func (c *ClusterClient) reaper(idleCheckFrequency time.Duration) {
ticker := time.NewTicker(idleCheckFrequency)
defer ticker.Stop()
for range ticker.C {
nodes, err := c.nodes.All()
if err != nil {
break
}
var n int
for _, node := range nodes {
nn, err := node.Client.connPool.(*pool.ConnPool).ReapStaleConns()
if err != nil {
internal.Logf("ReapStaleConns failed: %s", err)
} else {
n += nn
}
}
s := c.PoolStats()
internal.Logf(
"reaper: removed %d stale conns (TotalConns=%d FreeConns=%d Requests=%d Hits=%d Timeouts=%d)",
n, s.TotalConns, s.FreeConns, s.Requests, s.Hits, s.Timeouts,
)
}
}
func (c *ClusterClient) Pipeline() *Pipeline {
pipe := Pipeline{
exec: c.pipelineExec,
}
pipe.cmdable.process = pipe.Process
pipe.statefulCmdable.process = pipe.Process
return &pipe
}
func (c *ClusterClient) Pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
return c.Pipeline().pipelined(fn)
}
func (c *ClusterClient) pipelineExec(cmds []Cmder) error {
cmdsMap, err := c.mapCmdsByNode(cmds)
if err != nil {
return err
}
for i := 0; i <= c.opt.MaxRedirects; i++ {
failedCmds := make(map[*clusterNode][]Cmder)
for node, cmds := range cmdsMap {
cn, _, err := node.Client.conn()
if err != nil {
setCmdsErr(cmds, err)
continue
}
err = c.pipelineProcessCmds(cn, cmds, failedCmds)
node.Client.putConn(cn, err)
}
if len(failedCmds) == 0 {
break
}
cmdsMap = failedCmds
}
var firstErr error
for _, cmd := range cmds {
if err := cmd.Err(); err != nil {
firstErr = err
break
}
}
return firstErr
}
func (c *ClusterClient) mapCmdsByNode(cmds []Cmder) (map[*clusterNode][]Cmder, error) {
state := c.state()
cmdsMap := make(map[*clusterNode][]Cmder)
for _, cmd := range cmds {
_, node, err := c.cmdSlotAndNode(state, cmd)
if err != nil {
return nil, err
}
cmdsMap[node] = append(cmdsMap[node], cmd)
}
return cmdsMap, nil
}
func (c *ClusterClient) pipelineProcessCmds(
cn *pool.Conn, cmds []Cmder, failedCmds map[*clusterNode][]Cmder,
) error {
cn.SetWriteTimeout(c.opt.WriteTimeout)
if err := writeCmd(cn, cmds...); err != nil {
setCmdsErr(cmds, err)
return err
}
// Set read timeout for all commands.
cn.SetReadTimeout(c.opt.ReadTimeout)
return c.pipelineReadCmds(cn, cmds, failedCmds)
}
func (c *ClusterClient) pipelineReadCmds(
cn *pool.Conn, cmds []Cmder, failedCmds map[*clusterNode][]Cmder,
) error {
var firstErr error
for _, cmd := range cmds {
err := cmd.readReply(cn)
if err == nil {
continue
}
if firstErr == nil {
firstErr = err
}
err = c.checkMovedErr(cmd, failedCmds)
if err != nil && firstErr == nil {
firstErr = err
}
}
return firstErr
}
func (c *ClusterClient) checkMovedErr(cmd Cmder, failedCmds map[*clusterNode][]Cmder) error {
moved, ask, addr := internal.IsMovedError(cmd.Err())
if moved {
c.lazyReloadSlots()
node, err := c.nodes.Get(addr)
if err != nil {
return err
}
failedCmds[node] = append(failedCmds[node], cmd)
}
if ask {
node, err := c.nodes.Get(addr)
if err != nil {
return err
}
failedCmds[node] = append(failedCmds[node], NewCmd("ASKING"), cmd)
}
return nil
}
// TxPipeline acts like Pipeline, but wraps queued commands with MULTI/EXEC.
func (c *ClusterClient) TxPipeline() *Pipeline {
pipe := Pipeline{
exec: c.txPipelineExec,
}
pipe.cmdable.process = pipe.Process
pipe.statefulCmdable.process = pipe.Process
return &pipe
}
func (c *ClusterClient) TxPipelined(fn func(*Pipeline) error) ([]Cmder, error) {
return c.TxPipeline().pipelined(fn)
}
func (c *ClusterClient) txPipelineExec(cmds []Cmder) error {
cmdsMap, err := c.mapCmdsBySlot(cmds)
if err != nil {
return err
}
state := c.state()
if state == nil {
return errNilClusterState
}
for slot, cmds := range cmdsMap {
node, err := state.slotMasterNode(slot)
if err != nil {
setCmdsErr(cmds, err)
continue
}
cmdsMap := map[*clusterNode][]Cmder{node: cmds}
for i := 0; i <= c.opt.MaxRedirects; i++ {
failedCmds := make(map[*clusterNode][]Cmder)
for node, cmds := range cmdsMap {
cn, _, err := node.Client.conn()
if err != nil {
setCmdsErr(cmds, err)
continue
}
err = c.txPipelineProcessCmds(node, cn, cmds, failedCmds)
node.Client.putConn(cn, err)
}
if len(failedCmds) == 0 {
break
}
cmdsMap = failedCmds
}
}
var firstErr error
for _, cmd := range cmds {
if err := cmd.Err(); err != nil {
firstErr = err
break
}
}
return firstErr
}
func (c *ClusterClient) mapCmdsBySlot(cmds []Cmder) (map[int][]Cmder, error) {
state := c.state()
cmdsMap := make(map[int][]Cmder)
for _, cmd := range cmds {
slot, _, err := c.cmdSlotAndNode(state, cmd)
if err != nil {
return nil, err
}
cmdsMap[slot] = append(cmdsMap[slot], cmd)
}
return cmdsMap, nil
}
func (c *ClusterClient) txPipelineProcessCmds(
node *clusterNode, cn *pool.Conn, cmds []Cmder, failedCmds map[*clusterNode][]Cmder,
) error {
cn.SetWriteTimeout(c.opt.WriteTimeout)
if err := txPipelineWriteMulti(cn, cmds); err != nil {
setCmdsErr(cmds, err)
failedCmds[node] = cmds
return err
}
// Set read timeout for all commands.
cn.SetReadTimeout(c.opt.ReadTimeout)
if err := c.txPipelineReadQueued(cn, cmds, failedCmds); err != nil {
return err
}
_, err := pipelineReadCmds(cn, cmds)
return err
}
func (c *ClusterClient) txPipelineReadQueued(
cn *pool.Conn, cmds []Cmder, failedCmds map[*clusterNode][]Cmder,
) error {
var firstErr error
// Parse queued replies.
var statusCmd StatusCmd
if err := statusCmd.readReply(cn); err != nil && firstErr == nil {
firstErr = err
}
for _, cmd := range cmds {
err := statusCmd.readReply(cn)
if err == nil {
continue
}
cmd.setErr(err)
if firstErr == nil {
firstErr = err
}
err = c.checkMovedErr(cmd, failedCmds)
if err != nil && firstErr == nil {
firstErr = err
}
}
// Parse number of replies.
line, err := cn.Rd.ReadLine()
if err != nil {
if err == Nil {
err = TxFailedErr
}
return err
}
switch line[0] {
case proto.ErrorReply:
return proto.ParseErrorReply(line)
case proto.ArrayReply:
// ok
default:
err := fmt.Errorf("redis: expected '*', but got line %q", line)
return err
}
return firstErr
}