add http config loader

providers/http/env.go

@@ -0,0 +1,44 @@
+package http
+
+import (
+	"log"
+
+	"github.com/rogeecn/atom/utils/fs"
+	"github.com/spf13/viper"
+)
+
+const DefaultPrefix = "HTTP"
+
+func AutoLoadConfig() *Config {
+	return LoadConfig("", DefaultPrefix)
+}
+
+func LoadConfig(file, envPrefix string) *Config {
+	if file == "" {
+		file = "config.toml"
+	}
+
+	if envPrefix == "" {
+		envPrefix = DefaultPrefix
+	}
+
+	viper.SetEnvPrefix(envPrefix)
+	viper.AutomaticEnv()
+
+	if !fs.FileExist(file) {
+		return &Config{}
+	}
+
+	// load file
+	viper.SetConfigFile(file)
+	if err := viper.ReadInConfig(); err != nil {
+		log.Fatal(err)
+	}
+
+	var config Config
+	if err := viper.Unmarshal(&config); err != nil {
+		log.Fatal(err)
+	}
+
+	return &config
+}