redis/ring_test.go

627 lines
16 KiB
Go

package redis_test
import (
"context"
"crypto/rand"
"fmt"
"net"
"strconv"
"sync"
"time"
"github.com/go-redis/redis/v8"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Redis Ring", func() {
const heartbeat = 100 * time.Millisecond
var ring *redis.Ring
setRingKeys := func() {
for i := 0; i < 100; i++ {
err := ring.Set(ctx, fmt.Sprintf("key%d", i), "value", 0).Err()
Expect(err).NotTo(HaveOccurred())
}
}
BeforeEach(func() {
opt := redisRingOptions()
opt.HeartbeatFrequency = heartbeat
ring = redis.NewRing(opt)
err := ring.ForEachShard(ctx, func(ctx context.Context, cl *redis.Client) error {
return cl.FlushDB(ctx).Err()
})
Expect(err).NotTo(HaveOccurred())
})
AfterEach(func() {
Expect(ring.Close()).NotTo(HaveOccurred())
})
It("supports context", func() {
ctx, cancel := context.WithCancel(ctx)
cancel()
err := ring.Ping(ctx).Err()
Expect(err).To(MatchError("context canceled"))
})
It("distributes keys", func() {
setRingKeys()
// Both shards should have some keys now.
Expect(ringShard1.Info(ctx, "keyspace").Val()).To(ContainSubstring("keys=56"))
Expect(ringShard2.Info(ctx, "keyspace").Val()).To(ContainSubstring("keys=44"))
})
It("distributes keys when using EVAL", func() {
script := redis.NewScript(`
local r = redis.call('SET', KEYS[1], ARGV[1])
return r
`)
var key string
for i := 0; i < 100; i++ {
key = fmt.Sprintf("key%d", i)
err := script.Run(ctx, ring, []string{key}, "value").Err()
Expect(err).NotTo(HaveOccurred())
}
Expect(ringShard1.Info(ctx, "keyspace").Val()).To(ContainSubstring("keys=56"))
Expect(ringShard2.Info(ctx, "keyspace").Val()).To(ContainSubstring("keys=44"))
})
It("uses single shard when one of the shards is down", func() {
// Stop ringShard2.
Expect(ringShard2.Close()).NotTo(HaveOccurred())
Eventually(func() int {
return ring.Len()
}, "30s").Should(Equal(1))
setRingKeys()
// RingShard1 should have all keys.
Expect(ringShard1.Info(ctx, "keyspace").Val()).To(ContainSubstring("keys=100"))
// Start ringShard2.
var err error
ringShard2, err = startRedis(ringShard2Port)
Expect(err).NotTo(HaveOccurred())
Eventually(func() int {
return ring.Len()
}, "30s").Should(Equal(2))
setRingKeys()
// RingShard2 should have its keys.
Expect(ringShard2.Info(ctx, "keyspace").Val()).To(ContainSubstring("keys=44"))
})
It("supports hash tags", func() {
for i := 0; i < 100; i++ {
err := ring.Set(ctx, fmt.Sprintf("key%d{tag}", i), "value", 0).Err()
Expect(err).NotTo(HaveOccurred())
}
Expect(ringShard1.Info(ctx, "keyspace").Val()).ToNot(ContainSubstring("keys="))
Expect(ringShard2.Info(ctx, "keyspace").Val()).To(ContainSubstring("keys=100"))
})
Describe("pipeline", func() {
It("distributes keys", func() {
pipe := ring.Pipeline()
for i := 0; i < 100; i++ {
err := pipe.Set(ctx, fmt.Sprintf("key%d", i), "value", 0).Err()
Expect(err).NotTo(HaveOccurred())
}
cmds, err := pipe.Exec(ctx)
Expect(err).NotTo(HaveOccurred())
Expect(cmds).To(HaveLen(100))
Expect(pipe.Close()).NotTo(HaveOccurred())
for _, cmd := range cmds {
Expect(cmd.Err()).NotTo(HaveOccurred())
Expect(cmd.(*redis.StatusCmd).Val()).To(Equal("OK"))
}
// Both shards should have some keys now.
Expect(ringShard1.Info(ctx).Val()).To(ContainSubstring("keys=56"))
Expect(ringShard2.Info(ctx).Val()).To(ContainSubstring("keys=44"))
})
It("is consistent with ring", func() {
var keys []string
for i := 0; i < 100; i++ {
key := make([]byte, 64)
_, err := rand.Read(key)
Expect(err).NotTo(HaveOccurred())
keys = append(keys, string(key))
}
_, err := ring.Pipelined(ctx, func(pipe redis.Pipeliner) error {
for _, key := range keys {
pipe.Set(ctx, key, "value", 0).Err()
}
return nil
})
Expect(err).NotTo(HaveOccurred())
for _, key := range keys {
val, err := ring.Get(ctx, key).Result()
Expect(err).NotTo(HaveOccurred())
Expect(val).To(Equal("value"))
}
})
It("supports hash tags", func() {
_, err := ring.Pipelined(ctx, func(pipe redis.Pipeliner) error {
for i := 0; i < 100; i++ {
pipe.Set(ctx, fmt.Sprintf("key%d{tag}", i), "value", 0).Err()
}
return nil
})
Expect(err).NotTo(HaveOccurred())
Expect(ringShard1.Info(ctx).Val()).ToNot(ContainSubstring("keys="))
Expect(ringShard2.Info(ctx).Val()).To(ContainSubstring("keys=100"))
})
})
Describe("new client callback", func() {
It("can be initialized with a new client callback", func() {
opts := redisRingOptions()
opts.NewClient = func(name string, opt *redis.Options) *redis.Client {
opt.Password = "password1"
return redis.NewClient(opt)
}
ring = redis.NewRing(opts)
err := ring.Ping(ctx).Err()
Expect(err).To(HaveOccurred())
Expect(err.Error()).To(ContainSubstring("ERR AUTH"))
})
})
It("supports Process hook", func() {
err := ring.Ping(ctx).Err()
Expect(err).NotTo(HaveOccurred())
var stack []string
ring.AddHook(&hook{
beforeProcess: func(ctx context.Context, cmd redis.Cmder) (context.Context, error) {
Expect(cmd.String()).To(Equal("ping: "))
stack = append(stack, "ring.BeforeProcess")
return ctx, nil
},
afterProcess: func(ctx context.Context, cmd redis.Cmder) error {
Expect(cmd.String()).To(Equal("ping: PONG"))
stack = append(stack, "ring.AfterProcess")
return nil
},
})
ring.ForEachShard(ctx, func(ctx context.Context, shard *redis.Client) error {
shard.AddHook(&hook{
beforeProcess: func(ctx context.Context, cmd redis.Cmder) (context.Context, error) {
Expect(cmd.String()).To(Equal("ping: "))
stack = append(stack, "shard.BeforeProcess")
return ctx, nil
},
afterProcess: func(ctx context.Context, cmd redis.Cmder) error {
Expect(cmd.String()).To(Equal("ping: PONG"))
stack = append(stack, "shard.AfterProcess")
return nil
},
})
return nil
})
err = ring.Ping(ctx).Err()
Expect(err).NotTo(HaveOccurred())
Expect(stack).To(Equal([]string{
"ring.BeforeProcess",
"shard.BeforeProcess",
"shard.AfterProcess",
"ring.AfterProcess",
}))
})
It("supports Pipeline hook", func() {
err := ring.Ping(ctx).Err()
Expect(err).NotTo(HaveOccurred())
var stack []string
ring.AddHook(&hook{
beforeProcessPipeline: func(ctx context.Context, cmds []redis.Cmder) (context.Context, error) {
Expect(cmds).To(HaveLen(1))
Expect(cmds[0].String()).To(Equal("ping: "))
stack = append(stack, "ring.BeforeProcessPipeline")
return ctx, nil
},
afterProcessPipeline: func(ctx context.Context, cmds []redis.Cmder) error {
Expect(cmds).To(HaveLen(1))
Expect(cmds[0].String()).To(Equal("ping: PONG"))
stack = append(stack, "ring.AfterProcessPipeline")
return nil
},
})
ring.ForEachShard(ctx, func(ctx context.Context, shard *redis.Client) error {
shard.AddHook(&hook{
beforeProcessPipeline: func(ctx context.Context, cmds []redis.Cmder) (context.Context, error) {
Expect(cmds).To(HaveLen(1))
Expect(cmds[0].String()).To(Equal("ping: "))
stack = append(stack, "shard.BeforeProcessPipeline")
return ctx, nil
},
afterProcessPipeline: func(ctx context.Context, cmds []redis.Cmder) error {
Expect(cmds).To(HaveLen(1))
Expect(cmds[0].String()).To(Equal("ping: PONG"))
stack = append(stack, "shard.AfterProcessPipeline")
return nil
},
})
return nil
})
_, err = ring.Pipelined(ctx, func(pipe redis.Pipeliner) error {
pipe.Ping(ctx)
return nil
})
Expect(err).NotTo(HaveOccurred())
Expect(stack).To(Equal([]string{
"ring.BeforeProcessPipeline",
"shard.BeforeProcessPipeline",
"shard.AfterProcessPipeline",
"ring.AfterProcessPipeline",
}))
})
It("supports TxPipeline hook", func() {
err := ring.Ping(ctx).Err()
Expect(err).NotTo(HaveOccurred())
var stack []string
ring.AddHook(&hook{
beforeProcessPipeline: func(ctx context.Context, cmds []redis.Cmder) (context.Context, error) {
Expect(cmds).To(HaveLen(1))
Expect(cmds[0].String()).To(Equal("ping: "))
stack = append(stack, "ring.BeforeProcessPipeline")
return ctx, nil
},
afterProcessPipeline: func(ctx context.Context, cmds []redis.Cmder) error {
Expect(cmds).To(HaveLen(1))
Expect(cmds[0].String()).To(Equal("ping: PONG"))
stack = append(stack, "ring.AfterProcessPipeline")
return nil
},
})
ring.ForEachShard(ctx, func(ctx context.Context, shard *redis.Client) error {
shard.AddHook(&hook{
beforeProcessPipeline: func(ctx context.Context, cmds []redis.Cmder) (context.Context, error) {
Expect(cmds).To(HaveLen(3))
Expect(cmds[1].String()).To(Equal("ping: "))
stack = append(stack, "shard.BeforeProcessPipeline")
return ctx, nil
},
afterProcessPipeline: func(ctx context.Context, cmds []redis.Cmder) error {
Expect(cmds).To(HaveLen(3))
Expect(cmds[1].String()).To(Equal("ping: PONG"))
stack = append(stack, "shard.AfterProcessPipeline")
return nil
},
})
return nil
})
_, err = ring.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
pipe.Ping(ctx)
return nil
})
Expect(err).NotTo(HaveOccurred())
Expect(stack).To(Equal([]string{
"ring.BeforeProcessPipeline",
"shard.BeforeProcessPipeline",
"shard.AfterProcessPipeline",
"ring.AfterProcessPipeline",
}))
})
})
var _ = Describe("empty Redis Ring", func() {
var ring *redis.Ring
BeforeEach(func() {
ring = redis.NewRing(&redis.RingOptions{})
})
AfterEach(func() {
Expect(ring.Close()).NotTo(HaveOccurred())
})
It("returns an error", func() {
err := ring.Ping(ctx).Err()
Expect(err).To(MatchError("redis: all ring shards are down"))
})
It("pipeline returns an error", func() {
_, err := ring.Pipelined(ctx, func(pipe redis.Pipeliner) error {
pipe.Ping(ctx)
return nil
})
Expect(err).To(MatchError("redis: all ring shards are down"))
})
})
var _ = Describe("Ring watch", func() {
const heartbeat = 100 * time.Millisecond
var ring *redis.Ring
BeforeEach(func() {
opt := redisRingOptions()
opt.HeartbeatFrequency = heartbeat
ring = redis.NewRing(opt)
err := ring.ForEachShard(ctx, func(ctx context.Context, cl *redis.Client) error {
return cl.FlushDB(ctx).Err()
})
Expect(err).NotTo(HaveOccurred())
})
AfterEach(func() {
Expect(ring.Close()).NotTo(HaveOccurred())
})
It("should Watch", func() {
var incr func(string) error
// Transactionally increments key using GET and SET commands.
incr = func(key string) error {
err := ring.Watch(ctx, func(tx *redis.Tx) error {
n, err := tx.Get(ctx, key).Int64()
if err != nil && err != redis.Nil {
return err
}
_, err = tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
pipe.Set(ctx, key, strconv.FormatInt(n+1, 10), 0)
return nil
})
return err
}, key)
if err == redis.TxFailedErr {
return incr(key)
}
return err
}
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(1)
go func() {
defer GinkgoRecover()
defer wg.Done()
err := incr("key")
Expect(err).NotTo(HaveOccurred())
}()
}
wg.Wait()
n, err := ring.Get(ctx, "key").Int64()
Expect(err).NotTo(HaveOccurred())
Expect(n).To(Equal(int64(100)))
})
It("should discard", func() {
err := ring.Watch(ctx, func(tx *redis.Tx) error {
cmds, err := tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
pipe.Set(ctx, "{shard}key1", "hello1", 0)
pipe.Discard()
pipe.Set(ctx, "{shard}key2", "hello2", 0)
return nil
})
Expect(err).NotTo(HaveOccurred())
Expect(cmds).To(HaveLen(1))
return err
}, "{shard}key1", "{shard}key2")
Expect(err).NotTo(HaveOccurred())
get := ring.Get(ctx, "{shard}key1")
Expect(get.Err()).To(Equal(redis.Nil))
Expect(get.Val()).To(Equal(""))
get = ring.Get(ctx, "{shard}key2")
Expect(get.Err()).NotTo(HaveOccurred())
Expect(get.Val()).To(Equal("hello2"))
})
It("returns no error when there are no commands", func() {
err := ring.Watch(ctx, func(tx *redis.Tx) error {
_, err := tx.TxPipelined(ctx, func(redis.Pipeliner) error { return nil })
return err
}, "key")
Expect(err).NotTo(HaveOccurred())
v, err := ring.Ping(ctx).Result()
Expect(err).NotTo(HaveOccurred())
Expect(v).To(Equal("PONG"))
})
It("should exec bulks", func() {
const N = 20000
err := ring.Watch(ctx, func(tx *redis.Tx) error {
cmds, err := tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
for i := 0; i < N; i++ {
pipe.Incr(ctx, "key")
}
return nil
})
Expect(err).NotTo(HaveOccurred())
Expect(len(cmds)).To(Equal(N))
for _, cmd := range cmds {
Expect(cmd.Err()).NotTo(HaveOccurred())
}
return err
}, "key")
Expect(err).NotTo(HaveOccurred())
num, err := ring.Get(ctx, "key").Int64()
Expect(err).NotTo(HaveOccurred())
Expect(num).To(Equal(int64(N)))
})
It("should Watch/Unwatch", func() {
var C, N int
err := ring.Set(ctx, "key", "0", 0).Err()
Expect(err).NotTo(HaveOccurred())
perform(C, func(id int) {
for i := 0; i < N; i++ {
err := ring.Watch(ctx, func(tx *redis.Tx) error {
val, err := tx.Get(ctx, "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 := tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
pipe.Set(ctx, "key", strconv.FormatInt(num+1, 10), 0)
return nil
})
Expect(cmds).To(HaveLen(1))
return err
}, "key")
if err == redis.TxFailedErr {
i--
continue
}
Expect(err).NotTo(HaveOccurred())
}
})
val, err := ring.Get(ctx, "key").Int64()
Expect(err).NotTo(HaveOccurred())
Expect(val).To(Equal(int64(C * N)))
})
It("should close Tx without closing the client", func() {
err := ring.Watch(ctx, func(tx *redis.Tx) error {
_, err := tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
pipe.Ping(ctx)
return nil
})
return err
}, "key")
Expect(err).NotTo(HaveOccurred())
Expect(ring.Ping(ctx).Err()).NotTo(HaveOccurred())
})
It("respects max size on multi", func() {
perform(1000, func(id int) {
var ping *redis.StatusCmd
err := ring.Watch(ctx, func(tx *redis.Tx) error {
cmds, err := tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
ping = pipe.Ping(ctx)
return nil
})
Expect(err).NotTo(HaveOccurred())
Expect(cmds).To(HaveLen(1))
return err
}, "key")
Expect(err).NotTo(HaveOccurred())
Expect(ping.Err()).NotTo(HaveOccurred())
Expect(ping.Val()).To(Equal("PONG"))
})
ring.ForEachShard(ctx, func(ctx context.Context, cl *redis.Client) error {
defer GinkgoRecover()
pool := cl.Pool()
Expect(pool.Len()).To(BeNumerically("<=", 10))
Expect(pool.IdleLen()).To(BeNumerically("<=", 10))
Expect(pool.Len()).To(Equal(pool.IdleLen()))
return nil
})
})
})
var _ = Describe("Ring Tx timeout", func() {
const heartbeat = 100 * time.Millisecond
var ring *redis.Ring
AfterEach(func() {
_ = ring.Close()
})
testTimeout := func() {
It("Tx timeouts", func() {
err := ring.Watch(ctx, func(tx *redis.Tx) error {
return tx.Ping(ctx).Err()
}, "foo")
Expect(err).To(HaveOccurred())
Expect(err.(net.Error).Timeout()).To(BeTrue())
})
It("Tx Pipeline timeouts", func() {
err := ring.Watch(ctx, func(tx *redis.Tx) error {
_, err := tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
pipe.Ping(ctx)
return nil
})
return err
}, "foo")
Expect(err).To(HaveOccurred())
Expect(err.(net.Error).Timeout()).To(BeTrue())
})
}
const pause = 5 * time.Second
Context("read/write timeout", func() {
BeforeEach(func() {
opt := redisRingOptions()
opt.ReadTimeout = 250 * time.Millisecond
opt.WriteTimeout = 250 * time.Millisecond
opt.HeartbeatFrequency = heartbeat
ring = redis.NewRing(opt)
err := ring.ForEachShard(ctx, func(ctx context.Context, client *redis.Client) error {
return client.ClientPause(ctx, pause).Err()
})
Expect(err).NotTo(HaveOccurred())
})
AfterEach(func() {
_ = ring.ForEachShard(ctx, func(ctx context.Context, client *redis.Client) error {
defer GinkgoRecover()
Eventually(func() error {
return client.Ping(ctx).Err()
}, 2*pause).ShouldNot(HaveOccurred())
return nil
})
})
testTimeout()
})
})