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redis.go
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redis.go
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package throttle
import (
"context"
"errors"
"fmt"
"time"
"github.com/go-redis/redis/v8"
)
// RedisThrottler redis throttler
type RedisThrottler struct {
redisClient redis.UniversalClient
}
var _ Throttler = (*RedisThrottler)(nil)
// NewRedisThrottler creates a new RedisThrottler
func NewRedisThrottler(redisClient redis.UniversalClient) *RedisThrottler {
return &RedisThrottler{
redisClient: redisClient,
}
}
// New curried redis throttling
func (r *RedisThrottler) New(key string, duration time.Duration, fn func(ctx context.Context) error) func(context.Context) error {
return func(ctx context.Context) error {
return r.do(ctx, key, duration, fn)
}
}
// New inline redis throttling
func (r *RedisThrottler) Do(ctx context.Context, key string, duration time.Duration, fn func(ctx context.Context) error) error {
return r.do(ctx, key, duration, fn)
}
func (r *RedisThrottler) do(ctx context.Context, key string, duration time.Duration, fn func(ctx context.Context) error) error {
err := r.redisClient.SetArgs(ctx, key, "", redis.SetArgs{Get: true, KeepTTL: true}).Err()
if err != nil && !errors.Is(err, redis.Nil) {
return fmt.Errorf("getting key: %w", err)
}
if err == nil {
return ErrThrottled
}
err = r.redisClient.SetEX(ctx, key, "", duration).Err()
if err != nil {
return fmt.Errorf("setting expiration: %w", err)
}
return fn(ctx)
}