106 lines
2.0 KiB
Go
106 lines
2.0 KiB
Go
package redis
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"os"
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"strconv"
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"time"
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redis "github.com/redis/go-redis/v9"
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)
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type Client struct {
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rdb *redis.Client
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}
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func NewFromEnv() (*Client, error) {
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addr := os.Getenv("REDIS_ADDR")
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if addr == "" {
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addr = "127.0.0.1:6379"
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}
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db := 0
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if v := os.Getenv("REDIS_DB"); v != "" {
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n, err := strconv.Atoi(v)
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if err != nil {
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return nil, err
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}
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db = n
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}
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rdb := redis.NewClient(&redis.Options{
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Addr: addr,
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Password: os.Getenv("REDIS_PASSWORD"),
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DB: db,
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})
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return &Client{rdb: rdb}, nil
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}
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func (c *Client) Close() error {
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if c == nil || c.rdb == nil {
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return nil
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}
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return c.rdb.Close()
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}
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func (c *Client) Ping(ctx context.Context) error {
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if c == nil || c.rdb == nil {
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return nil
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}
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return c.rdb.Ping(ctx).Err()
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}
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func (c *Client) GetBytes(ctx context.Context, key string) ([]byte, error) {
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return c.rdb.Get(ctx, key).Bytes()
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}
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func (c *Client) SetBytes(ctx context.Context, key string, value []byte, ttl time.Duration) error {
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return c.rdb.Set(ctx, key, value, ttl).Err()
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}
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func (c *Client) Del(ctx context.Context, key string) error {
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return c.rdb.Del(ctx, key).Err()
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}
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func IsMiss(err error) bool {
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return err == redis.Nil
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}
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func randToken(n int) (string, error) {
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b := make([]byte, n)
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if _, err := rand.Read(b); err != nil {
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return "", err
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}
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return hex.EncodeToString(b), nil
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}
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func (c *Client) Lock(ctx context.Context, key string, ttl time.Duration) (token string, ok bool, err error) {
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if c == nil || c.rdb == nil {
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return "", false, nil
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}
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token, err = randToken(16)
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if err != nil {
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return "", false, err
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}
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ok, err = c.rdb.SetNX(ctx, key, token, ttl).Result()
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return token, ok, err
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}
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var unlockScript = redis.NewScript(`
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if redis.call("GET", KEYS[1]) == ARGV[1] then
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return redis.call("DEL", KEYS[1])
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else
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return 0
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end
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`)
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func (c *Client) Unlock(ctx context.Context, key string, token string) error {
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if c == nil || c.rdb == nil {
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return nil
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}
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_, err := unlockScript.Run(ctx, c.rdb, []string{key}, token).Result()
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return err
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}
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