website/pkg/redis/redis.go

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// Package redis provides simple Redis cache functions.
package redis
import (
"context"
"encoding/json"
"fmt"
"strconv"
"strings"
"time"
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"code.nonshy.com/nonshy/website/pkg/log"
"github.com/go-redis/redis/v8"
)
var ctx = context.Background()
var Client *redis.Client
/*
Setup the Redis connection.
The addr format is like:
- localhost:6379
- localhost:6379/6
The latter format to specify the DB number if not the default (0).
*/
func Setup(addr string) error {
// Parse the addr string.
parts := strings.Split(addr, "/")
addr = parts[0]
db := 0
if len(parts) > 1 && len(parts[1]) > 0 {
a, err := strconv.Atoi(parts[1])
if err != nil {
return fmt.Errorf("redis DB number was not an integer: %s", err)
}
db = a
}
Client = redis.NewClient(&redis.Options{
Addr: addr,
DB: db,
})
return nil
}
// Set a JSON serializable object in Redis.
func Set(key string, v interface{}, expire time.Duration) error {
bin, err := json.Marshal(v)
if err != nil {
return err
}
log.Debug("redis.Set(%s): %s", key, bin)
_, err = Client.Set(ctx, key, bin, expire).Result()
if err != nil {
return err
}
return nil
}
// Get a JSON serialized value out of Redis.
func Get(key string, v any) error {
val, err := Client.Get(ctx, key).Result()
if err != nil {
return err
}
log.Debug("redis.Get(%s): %s", key, val)
return json.Unmarshal([]byte(val), v)
}
// Exists checks if a Redis key existed.
func Exists(key string) bool {
val, err := Client.Exists(ctx, key).Result()
if err != nil {
return false
}
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log.Debug("redis.Exists(%s): %d", key, val)
return val == 1
}
// Delete a key from Redis.
func Delete(key string) error {
return Client.Del(ctx, key).Err()
}