finish config module support ini/json/xml/yaml

config/config.go

@@ -0,0 +1,43 @@
+package config
+
+import (
+	"fmt"
+)
+
+type ConfigContainer interface {
+	Set(key, val string) error
+	String(key string) string
+	Int(key string) (int, error)
+	Int64(key string) (int64, error)
+	Bool(key string) (bool, error)
+	Float(key string) (float64, error)
+	DIY(key string) (interface{}, error)
+}
+
+type Config interface {
+	Parse(key string) (ConfigContainer, error)
+}
+
+var adapters = make(map[string]Config)
+
+// Register makes a config adapter available by the adapter name.
+// If Register is called twice with the same name or if driver is nil,
+// it panics.
+func Register(name string, adapter Config) {
+	if adapter == nil {
+		panic("config: Register adapter is nil")
+	}
+	if _, dup := adapters[name]; dup {
+		panic("config: Register called twice for adapter " + name)
+	}
+	adapters[name] = adapter
+}
+
+// config need to be correct JSON as string: {"interval":360}
+func NewConfig(adapterName, fileaname string) (ConfigContainer, error) {
+	adapter, ok := adapters[adapterName]
+	if !ok {
+		return nil, fmt.Errorf("config: unknown adaptername %q (forgotten import?)", adapterName)
+	}
+	return adapter.Parse(fileaname)
+}