initial commits 2

cache.go

@@ -0,0 +1,73 @@
+package core
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+var ctx context.Context
+
+type Cache struct {
+	redis *redis.Client
+}
+
+func NewCache(cacheConfig CacheConfig) *Cache {
+	ctx = context.Background()
+	dbStr := os.Getenv("REDIS_DB")
+	db64, err := strconv.ParseInt(dbStr, 10, 64)
+	if err != nil {
+		panic(fmt.Sprintf("error parsing redis db env var: %v", err))
+	}
+	db := int(db64)
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     fmt.Sprintf("%v:%v", os.Getenv("REDIS_HOST"), os.Getenv("REDIS_PORT")),
+		Password: os.Getenv("REDIS_PASSWORD"), // no password set
+		DB:       db,                          // use default DB
+	})
+
+	_, err = rdb.Ping(ctx).Result()
+	if cacheConfig.EnableCache && err != nil {
+		panic(fmt.Sprintf("problem connecting to redis cache, (if it's not needed you can disable it in config/cache.go): %v", err))
+	}
+
+	return &Cache{
+		redis: rdb,
+	}
+}
+
+func (c *Cache) Set(key string, value string) error {
+	err := c.redis.Set(ctx, key, value, 0).Err()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (c *Cache) SetWithExpiration(key string, value string, expiration time.Duration) error {
+	err := c.redis.Set(ctx, key, value, expiration).Err()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (c *Cache) Get(key string) (string, error) {
+	result, err := c.redis.Get(ctx, key).Result()
+	if err != nil {
+		return "", err
+	}
+	return result, nil
+}
+
+func (c *Cache) Delete(key string) error {
+	err := c.redis.Del(ctx, key).Err()
+	if err != nil {
+		return err
+	}
+	return nil
+}