Add exception error manager

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

exception/builder.go

@@ -0,0 +1,55 @@
+package exception
+
+import (
+	"fmt"
+)
+
+// 12 chars len
+// :1=status
+// :3=service
+// :2=endpoint
+// :1=common/specific
+// :5=original
+
+type Builder struct {
+	Status   string
+	Service  string
+	Endpoint string
+	Type     string
+	Original string
+}
+
+func (self *Builder) SetStatus(s string) *Builder {
+	self.Status = s
+	return self
+}
+
+func (self *Builder) SetService(s string) *Builder {
+	self.Service = s
+	return self
+}
+
+func (self *Builder) SetEndpoint(s string) *Builder {
+	self.Endpoint = s
+	return self
+}
+
+func (self *Builder) SetType(s string) *Builder {
+	self.Type = s
+	return self
+}
+
+func (self *Builder) SetOriginal(s string) *Builder {
+	self.Original = s
+	return self
+}
+
+func (self *Builder) Build() string {
+	return fmt.Sprintf("%s%s%s%s%s",
+		self.Status,
+		self.Service,
+		self.Endpoint,
+		self.Type,
+		self.Original,
+	)
+}