feat: 实现网关服务的长连接功能

backend/gateway/internal/config/config.go

@@ -0,0 +1,56 @@
+package config
+
+import (
+	"github.com/spf13/viper"
+)
+
+type Config struct {
+	Server   ServerConfig
+	Redis    RedisConfig
+	Services ServicesConfig
+}
+
+type ServerConfig struct {
+	Port int
+}
+
+type RedisConfig struct {
+	Addr     string
+	Password string
+	DB       int
+}
+
+type ServicesConfig struct {
+	UserService UserServiceConfig
+}
+
+type UserServiceConfig struct {
+	Addr string
+}
+
+func Load() (*Config, error) {
+	viper.SetConfigName("config")
+	viper.SetConfigType("yaml")
+	viper.AddConfigPath("./config")
+	viper.AddConfigPath("../config")
+	viper.AddConfigPath("../../config")
+
+	viper.SetDefault("server.port", 8000)
+	viper.SetDefault("redis.addr", "redis:6379")
+	viper.SetDefault("redis.password", "")
+	viper.SetDefault("redis.db", 0)
+	viper.SetDefault("services.userService.addr", "user-svc:9000")
+
+	if err := viper.ReadInConfig(); err != nil {
+		if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
+			return nil, err
+		}
+	}
+
+	var config Config
+	if err := viper.Unmarshal(&config); err != nil {
+		return nil, err
+	}
+
+	return &config, nil
+}