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cache lock release function

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This commit is contained in:
Andre Medeiros 2023-04-01 12:07:48 -04:00
parent 1dd0c3a47d
commit 9709c3a099
3 changed files with 42 additions and 21 deletions
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27
internal/distributedlock/distributed_lock.go
View file

@ -3,23 +3,42 @@ package distributedlock
import (
"context"
"fmt"
"github.com/go-redis/redis/v8"
"math/rand"
"time"
"github.com/go-redis/redis/v8"
)
const lockTopicFormat = "pubsub:locks:%s"
const (
lockTopicFormat = "pubsub:locks:%s"
lockReleaseScript = `
if redis.call("GET", KEYS[1]) == ARGV[1] then
redis.call("DEL", KEYS[1])
redis.call("PUBLISH", KEYS[2], KEYS[1])
return 1
else
return 0
end
`
)
type DistributedLock struct {
client *redis.Client
sha string
timeout time.Duration
}
func New(client *redis.Client, timeout time.Duration) *DistributedLock {
func New(client *redis.Client, timeout time.Duration) (*DistributedLock, error) {
sha, err := client.ScriptLoad(context.Background(), lockReleaseScript).Result()
if err != nil {
return nil, err
}
return &DistributedLock{
client: client,
sha: sha,
timeout: timeout,
}
}, nil
}
func (d *DistributedLock) setLock(ctx context.Context, key string, uid string) error {

25
internal/distributedlock/distributed_lock_test.go
View file

@ -3,12 +3,15 @@ package distributedlock_test
import (
"context"
"fmt"
"github.com/christianselig/apollo-backend/internal/distributedlock"
"github.com/go-redis/redis/v8"
"github.com/stretchr/testify/assert"
"math/rand"
"os"
"testing"
"time"
"github.com/christianselig/apollo-backend/internal/distributedlock"
"github.com/go-redis/redis/v8"
"github.com/stretchr/testify/assert"
)
func NewRedisClient(t *testing.T, ctx context.Context) (*redis.Client, func()) {
@ -29,13 +32,17 @@ func NewRedisClient(t *testing.T, ctx context.Context) (*redis.Client, func()) {
}
func TestDistributedLock_AcquireLock(t *testing.T) {
t.Parallel()
ctx := context.Background()
key := fmt.Sprintf("%d", time.Now().UnixNano())
key := fmt.Sprintf("key:%d-%d", time.Now().UnixNano(), rand.Int63())
client, closer := NewRedisClient(t, ctx)
defer closer()
d := distributedlock.New(client, 10*time.Second)
d, err := distributedlock.New(client, 10*time.Second)
assert.NoError(t, err)
lock, err := d.AcquireLock(ctx, key)
assert.NoError(t, err)
@ -50,13 +57,17 @@ func TestDistributedLock_AcquireLock(t *testing.T) {
}
func TestDistributedLock_WaitAcquireLock(t *testing.T) {
t.Parallel()
ctx := context.Background()
key := fmt.Sprintf("%d", time.Now().UnixNano())
key := fmt.Sprintf("key:%d-%d", time.Now().UnixNano(), rand.Int63())
client, closer := NewRedisClient(t, ctx)
defer closer()
d := distributedlock.New(client, 10*time.Second)
d, err := distributedlock.New(client, 10*time.Second)
assert.NoError(t, err)
lock, err := d.AcquireLock(ctx, key)
assert.NoError(t, err)

11
internal/distributedlock/lock.go
View file

@ -20,19 +20,10 @@ func NewLock(distributedLock *DistributedLock, key string, uid string) *Lock {
}
func (l *Lock) Release(ctx context.Context) error {
script := `
if redis.call("GET", KEYS[1]) == ARGV[1] then
redis.call("DEL", KEYS[1])
redis.call("PUBLISH", KEYS[2], KEYS[1])
return 1
else
return 0
end
`
ch := fmt.Sprintf(lockTopicFormat, l.key)
result, err := l.distributedLock.client.Eval(ctx, script, []string{l.key, ch}, l.uid).Result()
result, err := l.distributedLock.client.EvalSha(ctx, l.distributedLock.sha, []string{l.key, ch}, l.uid).Result()
if err != nil {
return err
}