Last active
October 18, 2023 18:50
-
-
Save M0nteCarl0/71ba4bda2bf90eb0ecf38373a97eb027 to your computer and use it in GitHub Desktop.
SQL requests_Redis cache
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package cache | |
import ( | |
"context" | |
"database/sql" | |
"encoding/json" | |
"fmt" | |
"time" | |
"github.com/go-redis/redis/v8" | |
) | |
type Cache struct { | |
redisClient *redis.Client | |
db *sql.DB | |
} | |
func NewCache(redisClient *redis.Client, db *sql.DB) *Cache { | |
return &Cache{ | |
redisClient: redisClient, | |
db: db, | |
} | |
} | |
func (c *Cache) GetFromCacheOrDB(ctx context.Context, key string, query string, args ...interface{}) ([]byte, error) { | |
// Проверяем наличие данных в Redis по ключу | |
cacheData, err := c.redisClient.HGet(ctx, "cache", key).Bytes() | |
if err == nil { | |
// Данные найдены в Redis | |
return cacheData, nil | |
} | |
// Если данных нет в Redis, выполняем SQL запрос | |
rows, err := c.db.QueryContext(ctx, query, args...) | |
if err != nil { | |
return nil, fmt.Errorf("failed to execute SQL query: %w", err) | |
} | |
defer rows.Close() | |
// Получаем данные из результата запроса | |
var data []interface{} | |
for rows.Next() { | |
var row interface{} | |
err := rows.Scan(&row) | |
if err != nil { | |
return nil, fmt.Errorf("failed to scan SQL row: %w", err) | |
} | |
data = append(data, row) | |
} | |
// Кэшируем данные в Redis на 5 минут | |
cacheData, err = json.Marshal(data) | |
if err != nil { | |
return nil, fmt.Errorf("failed to marshal data to JSON: %w", err) | |
} | |
err = c.redisClient.HSet(ctx, "cache", key, cacheData).Err() | |
if err != nil { | |
return nil, fmt.Errorf("failed to set data in Redis: %w", err) | |
} | |
err = c.redisClient.Expire(ctx, "cache", 5*time.Minute).Err() | |
if err != nil { | |
return nil, fmt.Errorf("failed to set expiration for cache: %w", err) | |
} | |
return cacheData, nil | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package cache | |
import ( | |
"context" | |
"database/sql" | |
"encoding/json" | |
"fmt" | |
"time" | |
"github.com/go-redis/redis/v8" | |
) | |
type Cache struct { | |
redisClient *redis.Client | |
db *sql.DB | |
} | |
func NewCache(redisClient *redis.Client, db *sql.DB) *Cache { | |
return &Cache{ | |
redisClient: redisClient, | |
db: db, | |
} | |
} | |
func (c *Cache) GetFromCacheOrDB(ctx context.Context, key string, query string, args ...interface{}) ([]byte, error) { | |
// Проверяем наличие данных в Redis по ключу | |
cacheData, err := c.redisClient.Get(ctx, key).Bytes() | |
if err == nil { | |
// Данные найдены в Redis | |
return cacheData, nil | |
} | |
// Если данных нет в Redis, выполняем SQL запрос | |
rows, err := c.db.QueryContext(ctx, query, args...) | |
if err != nil { | |
return nil, fmt.Errorf("failed to execute SQL query: %w", err) | |
} | |
defer rows.Close() | |
// Получаем данные из результата запроса | |
var data []interface{} | |
for rows.Next() { | |
var row interface{} | |
err := rows.Scan(&row) | |
if err != nil { | |
return nil, fmt.Errorf("failed to scan SQL row: %w", err) | |
} | |
data = append(data, row) | |
} | |
// Кэшируем данные в Redis на 5 минут | |
cacheData, err = json.Marshal(data) | |
if err != nil { | |
return nil, fmt.Errorf("failed to marshal data to JSON: %w", err) | |
} | |
err = c.redisClient.Set(ctx, key, cacheData, 5*time.Minute).Err() | |
if err != nil { | |
return nil, fmt.Errorf("failed to set data in Redis: %w", err) | |
} | |
return cacheData, nil | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment