swarm/storage/feed: Renamed package

swarm/storage/feed/error.go

@@ -0,0 +1,73 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package feed
+
+import (
+	"fmt"
+)
+
+const (
+	ErrInit = iota
+	ErrNotFound
+	ErrIO
+	ErrUnauthorized
+	ErrInvalidValue
+	ErrDataOverflow
+	ErrNothingToReturn
+	ErrCorruptData
+	ErrInvalidSignature
+	ErrNotSynced
+	ErrPeriodDepth
+	ErrCnt
+)
+
+// Error is a the typed error object used for Swarm feeds
+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 feeds package
+func (e *Error) Code() int {
+	return e.code
+}
+
+// NewError creates a new Swarm feeds 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...))
+}