first commit: one-api base code + SAAS plan document

common/redis.go

@@ -0,0 +1,81 @@
+package common
+
+import (
+	"context"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/go-redis/redis/v8"
+	"github.com/songquanpeng/one-api/common/logger"
+)
+
+var RDB redis.Cmdable
+var RedisEnabled = true
+
+// InitRedisClient This function is called after init()
+func InitRedisClient() (err error) {
+	if os.Getenv("REDIS_CONN_STRING") == "" {
+		RedisEnabled = false
+		logger.SysLog("REDIS_CONN_STRING not set, Redis is not enabled")
+		return nil
+	}
+	if os.Getenv("SYNC_FREQUENCY") == "" {
+		RedisEnabled = false
+		logger.SysLog("SYNC_FREQUENCY not set, Redis is disabled")
+		return nil
+	}
+	redisConnString := os.Getenv("REDIS_CONN_STRING")
+	if os.Getenv("REDIS_MASTER_NAME") == "" {
+		logger.SysLog("Redis is enabled")
+		opt, err := redis.ParseURL(redisConnString)
+		if err != nil {
+			logger.FatalLog("failed to parse Redis connection string: " + err.Error())
+		}
+		RDB = redis.NewClient(opt)
+	} else {
+		// cluster mode
+		logger.SysLog("Redis cluster mode enabled")
+		RDB = redis.NewUniversalClient(&redis.UniversalOptions{
+			Addrs:      strings.Split(redisConnString, ","),
+			Password:   os.Getenv("REDIS_PASSWORD"),
+			MasterName: os.Getenv("REDIS_MASTER_NAME"),
+		})
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	_, err = RDB.Ping(ctx).Result()
+	if err != nil {
+		logger.FatalLog("Redis ping test failed: " + err.Error())
+	}
+	return err
+}
+
+func ParseRedisOption() *redis.Options {
+	opt, err := redis.ParseURL(os.Getenv("REDIS_CONN_STRING"))
+	if err != nil {
+		logger.FatalLog("failed to parse Redis connection string: " + err.Error())
+	}
+	return opt
+}
+
+func RedisSet(key string, value string, expiration time.Duration) error {
+	ctx := context.Background()
+	return RDB.Set(ctx, key, value, expiration).Err()
+}
+
+func RedisGet(key string) (string, error) {
+	ctx := context.Background()
+	return RDB.Get(ctx, key).Result()
+}
+
+func RedisDel(key string) error {
+	ctx := context.Background()
+	return RDB.Del(ctx, key).Err()
+}
+
+func RedisDecrease(key string, value int64) error {
+	ctx := context.Background()
+	return RDB.DecrBy(ctx, key, value).Err()
+}