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Add ClusterPipeline.

This commit is contained in:
Vladimir Mihailenco 2015-03-18 12:41:24 +02:00
parent 5c951b37d5
commit 99fe9114b1
9 changed files with 310 additions and 104 deletions
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75
cluster.go
View File

@ -47,12 +47,16 @@ func (c *ClusterClient) Close() error {
// ------------------------------------------------------------------------
// getClient returns a Client for a given address.
func (c *ClusterClient) getClient(addr string) *Client {
func (c *ClusterClient) getClient(addr string) (*Client, error) {
if addr == "" {
return c.randomClient()
}
c.clientsMx.RLock()
client, ok := c.clients[addr]
if ok {
c.clientsMx.RUnlock()
return client
return client, nil
}
c.clientsMx.RUnlock()
@ -66,14 +70,24 @@ func (c *ClusterClient) getClient(addr string) *Client {
}
c.clientsMx.Unlock()
return client
return client, nil
}
func (c *ClusterClient) slotAddrs(slot int) []string {
c.slotsMx.RLock()
addrs := c.slots[slot]
c.slotsMx.RUnlock()
return addrs
}
// randomClient returns a Client for the first live node.
func (c *ClusterClient) randomClient() (client *Client, err error) {
for i := 0; i < 10; i++ {
n := rand.Intn(len(c.addrs))
client = c.getClient(c.addrs[n])
client, err = c.getClient(c.addrs[n])
if err != nil {
continue
}
err = client.Ping().Err()
if err == nil {
return client, nil
@ -82,27 +96,22 @@ func (c *ClusterClient) randomClient() (client *Client, err error) {
return nil, err
}
// Process a command
func (c *ClusterClient) process(cmd Cmder) {
var client *Client
var ask bool
c.reloadIfDue()
slot := hashSlot(cmd.clusterKey())
c.slotsMx.RLock()
addrs := c.slots[slot]
c.slotsMx.RUnlock()
if len(addrs) > 0 {
client = c.getClient(addrs[0]) // First address is master.
} else {
var err error
client, err = c.randomClient()
if err != nil {
cmd.setErr(err)
return
}
var addr string
if addrs := c.slotAddrs(slot); len(addrs) > 0 {
addr = addrs[0] // First address is master.
}
client, err := c.getClient(addr)
if err != nil {
cmd.setErr(err)
return
}
for attempt := 0; attempt <= c.opt.getMaxRedirects(); attempt++ {
@ -132,24 +141,22 @@ func (c *ClusterClient) process(cmd Cmder) {
continue
}
// Check the error message, return if unexpected
parts := strings.SplitN(err.Error(), " ", 3)
if len(parts) != 3 {
return
var moved bool
var addr string
moved, ask, addr = isMovedError(err)
if moved || ask {
if moved {
c.scheduleReload()
}
client, err = c.getClient(addr)
if err != nil {
return
}
cmd.reset()
continue
}
// Handle MOVE and ASK redirections, return on any other error
switch parts[0] {
case "MOVED":
c.scheduleReload()
client = c.getClient(parts[2])
case "ASK":
ask = true
client = c.getClient(parts[2])
default:
return
}
cmd.reset()
break
}
}

17
cluster_client_test.go
View File

@ -5,6 +5,23 @@ import (
. "github.com/onsi/gomega"
)
// GetSlot returns the cached slot addresses
func (c *ClusterClient) GetSlot(pos int) []string {
c.slotsMx.RLock()
defer c.slotsMx.RUnlock()
return c.slots[pos]
}
// SwapSlot swaps a slot's master/slave address
// for testing MOVED redirects
func (c *ClusterClient) SwapSlot(pos int) []string {
c.slotsMx.Lock()
defer c.slotsMx.Unlock()
c.slots[pos][0], c.slots[pos][1] = c.slots[pos][1], c.slots[pos][0]
return c.slots[pos]
}
var _ = Describe("ClusterClient", func() {
var subject *ClusterClient

128
cluster_pipeline.go Normal file
View File

@ -0,0 +1,128 @@
package redis
// ClusterPipeline is not thread-safe.
type ClusterPipeline struct {
commandable
cmds []Cmder
cluster *ClusterClient
closed bool
}
// Pipeline creates a new pipeline which is able to execute commands
// against multiple shards.
func (c *ClusterClient) Pipeline() *ClusterPipeline {
pipe := &ClusterPipeline{
cluster: c,
cmds: make([]Cmder, 0, 10),
}
pipe.commandable.process = pipe.process
return pipe
}
func (c *ClusterPipeline) process(cmd Cmder) {
c.cmds = append(c.cmds, cmd)
}
// Close marks the pipeline as closed
func (c *ClusterPipeline) Close() error {
c.closed = true
return nil
}
// Discard resets the pipeline and discards queued commands
func (c *ClusterPipeline) Discard() error {
if c.closed {
return errClosed
}
c.cmds = c.cmds[:0]
return nil
}
func (c *ClusterPipeline) Exec() (cmds []Cmder, retErr error) {
if c.closed {
return nil, errClosed
}
if len(c.cmds) == 0 {
return []Cmder{}, nil
}
cmds = c.cmds
c.cmds = make([]Cmder, 0, 10)
cmdsMap := make(map[string][]Cmder)
for _, cmd := range cmds {
slot := hashSlot(cmd.clusterKey())
addrs := c.cluster.slotAddrs(slot)
var addr string
if len(addrs) > 0 {
addr = addrs[0] // First address is master.
}
cmdsMap[addr] = append(cmdsMap[addr], cmd)
}
for attempt := 0; attempt <= c.cluster.opt.getMaxRedirects(); attempt++ {
failedCmds := make(map[string][]Cmder)
for addr, cmds := range cmdsMap {
client, err := c.cluster.getClient(addr)
if err != nil {
setCmdsErr(cmds, err)
retErr = err
continue
}
cn, err := client.conn()
if err != nil {
setCmdsErr(cmds, err)
retErr = err
continue
}
failedCmds, err = c.execClusterCmds(cn, cmds, failedCmds)
if err != nil {
retErr = err
}
client.freeConn(cn, err)
}
cmdsMap = failedCmds
}
return cmds, retErr
}
func (c *ClusterPipeline) execClusterCmds(
cn *conn, cmds []Cmder, failedCmds map[string][]Cmder,
) (map[string][]Cmder, error) {
if err := cn.writeCmds(cmds...); err != nil {
setCmdsErr(cmds, err)
return failedCmds, err
}
var firstCmdErr error
for i, cmd := range cmds {
err := cmd.parseReply(cn.rd)
if err == nil {
continue
}
if isNetworkError(err) {
cmd.reset()
failedCmds[""] = append(failedCmds[""], cmds[i:]...)
break
} else if moved, ask, addr := isMovedError(err); moved {
c.cluster.scheduleReload()
cmd.reset()
failedCmds[addr] = append(failedCmds[addr], cmd)
} else if ask {
cmd.reset()
failedCmds[addr] = append(failedCmds[addr], NewCmd("ASKING"), cmd)
} else if firstCmdErr == nil {
firstCmdErr = err
}
}
return failedCmds, firstCmdErr
}

52
cluster_test.go
View File

@ -2,9 +2,11 @@ package redis_test
import (
"math/rand"
"time"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"gopkg.in/redis.v2"
)
@ -181,22 +183,50 @@ var _ = Describe("Cluster", func() {
It("should follow redirects", func() {
Expect(client.Set("A", "VALUE", 0).Err()).NotTo(HaveOccurred())
Expect(redis.HashSlot("A")).To(Equal(6373))
// Slot 6373 is stored on the second node
defer func() {
scenario.masters()[1].ClusterFailover()
}()
slave := scenario.slaves()[1]
Expect(slave.ClusterFailover().Err()).NotTo(HaveOccurred())
Eventually(func() string {
return slave.Info().Val()
}, "10s", "200ms").Should(ContainSubstring("role:master"))
Expect(client.SwapSlot(6373)).To(Equal([]string{"127.0.0.1:8224", "127.0.0.1:8221"}))
val, err := client.Get("A").Result()
Expect(err).NotTo(HaveOccurred())
Expect(val).To(Equal("VALUE"))
Expect(client.GetSlot(6373)).To(Equal([]string{"127.0.0.1:8224", "127.0.0.1:8221"}))
val, err = client.Get("A").Result()
Expect(err).NotTo(HaveOccurred())
Expect(val).To(Equal("VALUE"))
Expect(client.GetSlot(6373)).To(Equal([]string{"127.0.0.1:8221", "127.0.0.1:8224"}))
})
It("should perform multi-pipelines", func() {
// Dummy command to load slots info.
Expect(client.Ping().Err()).NotTo(HaveOccurred())
slot := redis.HashSlot("A")
Expect(client.SwapSlot(slot)).To(Equal([]string{"127.0.0.1:8224", "127.0.0.1:8221"}))
pipe := client.Pipeline()
defer pipe.Close()
keys := []string{"A", "B", "C", "D", "E", "F", "G"}
for i, key := range keys {
pipe.Set(key, key+"_value", 0)
pipe.Expire(key, time.Duration(i+1)*time.Hour)
}
for _, key := range keys {
pipe.Get(key)
pipe.TTL(key)
}
cmds, err := pipe.Exec()
Expect(err).NotTo(HaveOccurred())
Expect(cmds).To(HaveLen(28))
Expect(cmds[14].(*redis.StringCmd).Val()).To(Equal("A_value"))
Expect(cmds[15].(*redis.DurationCmd).Val()).To(BeNumerically("~", 1*time.Hour, time.Second))
Expect(cmds[20].(*redis.StringCmd).Val()).To(Equal("D_value"))
Expect(cmds[21].(*redis.DurationCmd).Val()).To(BeNumerically("~", 4*time.Hour, time.Second))
Expect(cmds[26].(*redis.StringCmd).Val()).To(Equal("G_value"))
Expect(cmds[27].(*redis.DurationCmd).Val()).To(BeNumerically("~", 7*time.Hour, time.Second))
})
})
})

43
command_test.go
View File

@ -117,51 +117,52 @@ var _ = Describe("Command", func() {
})
Describe("races", func() {
var C, N = 10, 1000
if testing.Short() {
N = 100
}
It("should echo", func() {
var n = 10000
if testing.Short() {
n = 1000
}
wg := &sync.WaitGroup{}
wg.Add(n)
for i := 0; i < n; i++ {
for i := 0; i < C; i++ {
wg.Add(1)
go func(i int) {
defer GinkgoRecover()
defer wg.Done()
msg := "echo" + strconv.Itoa(i)
echo := client.Echo(msg)
Expect(echo.Err()).NotTo(HaveOccurred())
Expect(echo.Val()).To(Equal(msg))
for j := 0; j < N; j++ {
msg := "echo" + strconv.Itoa(i)
echo := client.Echo(msg)
Expect(echo.Err()).NotTo(HaveOccurred())
Expect(echo.Val()).To(Equal(msg))
}
}(i)
}
wg.Wait()
})
It("should incr", func() {
var n = 10000
if testing.Short() {
n = 1000
}
key := "TestIncrFromGoroutines"
wg := &sync.WaitGroup{}
wg.Add(n)
for i := 0; i < n; i++ {
for i := 0; i < C; i++ {
wg.Add(1)
go func() {
defer GinkgoRecover()
defer wg.Done()
err := client.Incr(key).Err()
Expect(err).NotTo(HaveOccurred())
for j := 0; j < N; j++ {
err := client.Incr(key).Err()
Expect(err).NotTo(HaveOccurred())
}
}()
}
wg.Wait()
val, err := client.Get(key).Int64()
Expect(err).NotTo(HaveOccurred())
Expect(val).To(Equal(int64(n)))
Expect(val).To(Equal(int64(C * N)))
})
})

52
commands_test.go
View File

@ -2245,53 +2245,49 @@ var _ = Describe("Commands", func() {
Describe("watch/unwatch", func() {
var safeIncr = func() ([]redis.Cmder, error) {
multi := client.Multi()
defer multi.Close()
watch := multi.Watch("key")
Expect(watch.Err()).NotTo(HaveOccurred())
Expect(watch.Val()).To(Equal("OK"))
get := multi.Get("key")
Expect(get.Err()).NotTo(HaveOccurred())
Expect(get.Val()).NotTo(Equal(redis.Nil))
v, err := strconv.ParseInt(get.Val(), 10, 64)
Expect(err).NotTo(HaveOccurred())
return multi.Exec(func() error {
multi.Set("key", strconv.FormatInt(v+1, 10), 0)
return nil
})
}
It("should WatchUnwatch", func() {
var n = 10000
var C, N = 10, 1000
if testing.Short() {
n = 1000
N = 100
}
err := client.Set("key", "0", 0).Err()
Expect(err).NotTo(HaveOccurred())
wg := &sync.WaitGroup{}
for i := 0; i < n; i++ {
for i := 0; i < C; i++ {
wg.Add(1)
go func() {
defer GinkgoRecover()
defer wg.Done()
for {
cmds, err := safeIncr()
multi := client.Multi()
defer multi.Close()
for j := 0; j < N; j++ {
val, err := multi.Watch("key").Result()
Expect(err).NotTo(HaveOccurred())
Expect(val).To(Equal("OK"))
val, err = multi.Get("key").Result()
Expect(err).NotTo(HaveOccurred())
Expect(val).NotTo(Equal(redis.Nil))
num, err := strconv.ParseInt(val, 10, 64)
Expect(err).NotTo(HaveOccurred())
cmds, err := multi.Exec(func() error {
multi.Set("key", strconv.FormatInt(num+1, 10), 0)
return nil
})
if err == redis.TxFailedErr {
j--
continue
}
Expect(err).NotTo(HaveOccurred())
Expect(cmds).To(HaveLen(1))
Expect(cmds[0].Err()).NotTo(HaveOccurred())
break
}
}()
}
@ -2299,7 +2295,7 @@ var _ = Describe("Commands", func() {
val, err := client.Get("key").Int64()
Expect(err).NotTo(HaveOccurred())
Expect(val).To(Equal(int64(n)))
Expect(val).To(Equal(int64(C * N)))
})
})

23
error.go
View File

@ -4,6 +4,7 @@ import (
"fmt"
"io"
"net"
"strings"
)
// Redis nil reply.
@ -30,3 +31,25 @@ func isNetworkError(err error) bool {
}
return false
}
func isMovedError(err error) (moved bool, ask bool, addr string) {
if _, ok := err.(redisError); !ok {
return
}
parts := strings.SplitN(err.Error(), " ", 3)
if len(parts) != 3 {
return
}
switch parts[0] {
case "MOVED":
moved = true
addr = parts[2]
case "ASK":
ask = true
addr = parts[2]
}
return
}

22
pipeline.go
View File

@ -54,14 +54,13 @@ func (c *Pipeline) Exec() ([]Cmder, error) {
if c.closed {
return nil, errClosed
}
if len(c.cmds) == 0 {
return []Cmder{}, nil
}
cmds := c.cmds
c.cmds = make([]Cmder, 0, 0)
if len(cmds) == 0 {
return []Cmder{}, nil
}
cn, err := c.client.conn()
if err != nil {
setCmdsErr(cmds, err)
@ -84,11 +83,16 @@ func (c *Pipeline) execCmds(cn *conn, cmds []Cmder) error {
}
var firstCmdErr error
for _, cmd := range cmds {
if err := cmd.parseReply(cn.rd); err != nil {
if firstCmdErr == nil {
firstCmdErr = err
}
for i, cmd := range cmds {
err := cmd.parseReply(cn.rd)
if err == nil {
continue
}
if firstCmdErr == nil {
firstCmdErr = err
}
if isNetworkError(err) {
setCmdsErr(cmds[i:], err)
}
}

2
redis_test.go
View File

@ -127,7 +127,7 @@ func TestGinkgoSuite(t *testing.T) {
func execCmd(name string, args ...string) (*os.Process, error) {
cmd := exec.Command(name, args...)
if false {
if testing.Verbose() {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
}