Add warp and cause interface

.gitignore

@@ -6,6 +6,7 @@
 # Folders
 _obj
 _test
+.idea
 
 # Architecture specific extensions/prefixes
 *.[568vq]

terror_error.go

@@ -19,6 +19,9 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 )
 
 // Error is the 'prototype' of a type of errors.
@@ -61,9 +64,11 @@ type Error struct {
 	// and the more detail this field explaining the better,
 	// even some guess of the cause could be included.
 	Description string
-	args        []interface{}
-	file        string
-	line        int
+	// Cause is used to warp some third party error.
+	cause error
+	args  []interface{}
+	file  string
+	line  int
 }
 
 // Class returns ErrClass
@@ -291,3 +296,35 @@ func (e *Error) UnmarshalJSON(data []byte) error {
 	}
 	return nil
 }
+
+func (e *Error) WarpCauseError(err error) *Error {
+	e.cause = err
+	return e
+}
+
+func (e *Error) Cause() error {
+	return e.cause
+}
+
+func (e *Error) FastGenWithCause(args ...interface{}) error {
+	err := *e
+	err.message = e.cause.Error()
+	err.args = args
+	return SuspendStack(&err)
+}
+
+func (e *Error) GenWithStackByCause(args ...interface{}) error {
+	err := *e
+	err.message = e.cause.Error()
+	err.args = args
+	err.fillLineAndFile(1)
+	return AddStack(&err)
+}
+
+func CauseError(err *Error) zap.Field {
+	return zap.Field{Key: "error", Type: zapcore.ErrorType, Interface: err.FastGenWithCause()}
+}
+
+func DetailError(err *Error) zap.Field {
+	return zap.Field{Key: "error", Type: zapcore.ErrorType, Interface: err.FastGenByArgs()}
+}

terror_test/terror_test.go

@@ -39,6 +39,7 @@ var (
 	ClassParser    = reg.RegisterErrorClass(11, "parser")
 	ClassServer    = reg.RegisterErrorClass(15, "server")
 	ClassTable     = reg.RegisterErrorClass(19, "table")
+	ClassMember    = reg.RegisterErrorClass(20, "member")
 )
 
 const (
@@ -339,3 +340,11 @@ func (*testTErrorSuite) TestLineAndFile(c *C) {
 	c.Assert(file2, Equals, f2)
 	c.Assert(line2, Equals, l2-1)
 }
+
+func (*testTErrorSuite) TestWarpAndField(c *C) {
+	causeErr := errors.New("load from etcd meet error")
+	ErrGetLeader := ClassMember.DefineError().TextualCode("ErrGetLeader").MessageTemplate("fail to get leader").Build()
+	errWithWarpedCause := ErrGetLeader.WarpCauseError(causeErr)
+	c.Assert(errWithWarpedCause.FastGenWithCause().Error(), Equals, "[DB:member:ErrGetLeader] load from etcd meet error")
+	c.Assert(fmt.Sprintf("%v", errWithWarpedCause.FastGenWithCause()), Equals, "[DB:member:ErrGetLeader] fail to get leader")
+}