WIP: Full restruct, seprate service and api

Signed-off-by: Asai Neko <sugar@sne.moe>

internal/exception/builder.go

@@ -13,12 +13,13 @@ import (
 // :5=original
 
 type Builder struct {
-	Status   string
-	Service  string
-	Endpoint string
-	Type     string
-	Original string
-	Error    error
+	Status    string
+	Service   string
+	Endpoint  string
+	Type      string
+	Original  string
+	Error     error
+	ErrorCode string
 }
 
 func (self *Builder) SetStatus(s string) *Builder {
@@ -51,16 +52,25 @@ func (self *Builder) SetError(e error) *Builder {
 	return self
 }
 
-func (self *Builder) Build(ctx context.Context) string {
-	errorCode := fmt.Sprintf("%s%s%s%s%s",
+func (self *Builder) build() {
+	self.ErrorCode = fmt.Sprintf("%s%s%s%s%s",
 		self.Status,
 		self.Service,
 		self.Endpoint,
 		self.Type,
 		self.Original,
 	)
-	if self.Error != nil {
-		ErrorHandler(ctx, self.Status, errorCode, self.Error)
-	}
-	return errorCode
+}
+
+func (self *Builder) Throw(ctx *context.Context) *Builder {
+	self.build()
+	if self.Error != nil {
+		ErrorHandler(ctx, self.Status, self.ErrorCode, self.Error)
+	}
+	return self
+}
+
+func (self *Builder) String() string {
+	self.build()
+	return self.ErrorCode
 }