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logic.go
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logic.go
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package main
import (
"context"
"time"
)
// ShortToLong gets the long URL from a short URL
func ShortToLong(ctx context.Context, shortKey string) string {
rc := GetRedisClient()
return rc.Get(ctx, shortKey).Val()
}
// LongToShortOptions are the options for the LongToShort function
type LongToShortOptions struct {
ShortKey string
URL string
expiration time.Duration
}
// LongToShort creates a short URL from a long URL
func LongToShort(ctx context.Context, options *LongToShortOptions) error {
rc := GetRedisClient()
return rc.SetEx(ctx, options.ShortKey, options.URL, options.expiration).Err()
}
// Renew updates the expiration time of a short URL
func Renew(ctx context.Context, shortKey string, expiration time.Duration) error {
rc := GetRedisClient()
rs := rc.TTL(ctx, shortKey)
if rs.Err() != nil {
return rs.Err()
}
ttl := rs.Val()
if ttl < 0 {
return nil
}
return rc.Expire(ctx, shortKey, ttl+expiration).Err()
}
func CheckRedisKeyIfExist(ctx context.Context, key string) (bool, error) {
rc := GetRedisClient()
rs := rc.Exists(ctx, key)
if rs.Err() != nil {
return false, rs.Err()
}
return rs.Val() > 0, nil
}