137 lines
3.1 KiB
Go
137 lines
3.1 KiB
Go
package redis
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import (
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"context"
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"fmt"
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"time"
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"github.com/bsm/redislock"
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"github.com/go-redis/redis/v8"
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)
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// Client is wrapper interface for redis.Client and redis.ClusterClient.
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type Client interface {
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Get(ctx context.Context, key string) ([]byte, error)
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Lock(ctx context.Context, key string, expiration time.Duration) error
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Unlock(ctx context.Context, key string) error
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Set(ctx context.Context, key string, value []byte, expiration time.Duration) error
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Del(ctx context.Context, key string) error
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}
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var _ Client = (*client)(nil)
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type client struct {
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*redis.Client
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locker *redislock.Client
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locks map[string]*redislock.Lock
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}
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func newClient(c *redis.Client) Client {
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return &client{
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Client: c,
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locker: redislock.New(c),
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locks: map[string]*redislock.Lock{},
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}
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}
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func (c *client) Get(ctx context.Context, key string) ([]byte, error) {
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if c.locks[key] != nil {
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for {
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ttl, err := c.locks[key].TTL(ctx)
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if err != nil {
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return nil, err
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}
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if ttl <= 0 {
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break
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}
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}
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}
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return c.Client.Get(ctx, key).Bytes()
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}
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func (c *client) Lock(ctx context.Context, key string, expiration time.Duration) error {
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if c.locks[key] != nil {
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return fmt.Errorf("locks for key %s already exists", key)
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}
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lock, err := c.locker.Obtain(ctx, key, expiration, nil)
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if err != nil {
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return err
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}
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c.locks[key] = lock
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return nil
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}
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func (c *client) Unlock(ctx context.Context, key string) error {
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if c.locks[key] == nil {
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return nil
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}
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return c.locks[key].Release(ctx)
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}
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func (c *client) Set(ctx context.Context, key string, value []byte, expiration time.Duration) error {
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err := c.Client.Set(ctx, key, value, expiration).Err()
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if err != nil {
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return err
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}
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if c.locks[key] == nil {
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return nil
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}
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err = c.locks[key].Release(ctx)
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if err != nil {
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return err
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}
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c.locks = nil
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return nil
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}
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func (c *client) Del(ctx context.Context, key string) error {
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return c.Client.Del(ctx, key).Err()
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}
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var _ Client = (*clusterClient)(nil)
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type clusterClient struct {
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*redis.ClusterClient
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locker *redislock.Client
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locks map[string]*redislock.Lock
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}
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func newClusterClient(c *redis.ClusterClient) Client {
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return &clusterClient{
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ClusterClient: c,
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locker: redislock.New(c),
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locks: map[string]*redislock.Lock{},
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}
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}
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func (c *clusterClient) Get(ctx context.Context, key string) ([]byte, error) {
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return c.ClusterClient.Get(ctx, key).Bytes()
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}
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func (c *clusterClient) Lock(ctx context.Context, key string, expiration time.Duration) error {
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if c.locks[key] != nil {
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return fmt.Errorf("locks for key %s already exists", key)
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}
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lock, err := c.locker.Obtain(ctx, key, expiration, nil)
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if err != nil {
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return err
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}
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c.locks[key] = lock
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return nil
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}
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func (c *clusterClient) Unlock(ctx context.Context, key string) error {
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if c.locks[key] == nil {
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return nil
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}
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return c.locks[key].Release(ctx)
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}
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func (c *clusterClient) Set(ctx context.Context, key string, value []byte, expiration time.Duration) error {
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return c.ClusterClient.Set(ctx, key, value, expiration).Err()
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}
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func (c *clusterClient) Del(ctx context.Context, key string) error {
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return c.ClusterClient.Del(ctx, key).Err()
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}
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