1 files changed, 41 insertions, 0 deletions
diff --git a/swarm/storage/mru/error.go b/swarm/storage/mru/error.go
index bf33e6540..18ab52558 100644
--- a/swarm/storage/mru/error.go
+++ b/swarm/storage/mru/error.go
@@ -16,6 +16,10 @@
 
 package mru
 
+import (
+	"fmt"
+)
+
 const (
 	ErrInit = iota
 	ErrNotFound
@@ -30,3 +34,40 @@ const (
 	ErrPeriodDepth
 	ErrCnt
 )
+
+// Error is a the typed error object used for Mutable Resources
+type Error struct {
+	code int
+	err  string
+}
+
+// Error implements the error interface
+func (e *Error) Error() string {
+	return e.err
+}
+
+// Code returns the error code
+// Error codes are enumerated in the error.go file within the mru package
+func (e *Error) Code() int {
+	return e.code
+}
+
+// NewError creates a new Mutable Resource Error object with the specified code and custom error message
+func NewError(code int, s string) error {
+	if code < 0 || code >= ErrCnt {
+		panic("no such error code!")
+	}
+	r := &Error{
+		err: s,
+	}
+	switch code {
+	case ErrNotFound, ErrIO, ErrUnauthorized, ErrInvalidValue, ErrDataOverflow, ErrNothingToReturn, ErrInvalidSignature, ErrNotSynced, ErrPeriodDepth, ErrCorruptData:
+		r.code = code
+	}
+	return r
+}
+
+// NewErrorf is a convenience version of NewError that incorporates printf-style formatting
+func NewErrorf(code int, format string, args ...interface{}) error {
+	return NewError(code, fmt.Sprintf(format, args...))
+}