/
diff.go
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/
diff.go
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/*
* Minio Client (C) 2015 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"path/filepath"
"github.com/minio/mc/pkg/client"
"github.com/minio/minio/pkg/iodine"
)
//
// NOTE: All the parse rules should reduced to 1: Diff(First, Second).
//
// Valid cases
// =======================
// 1: diff(f, f) -> diff(f, f)
// 2: diff(f, d) -> copy(f, d/f) -> 1
// 3: diff(d1..., d2) -> []diff(d1/f, d2/f) -> []1
//
// InValid cases
// =======================
// 1. diff(d1..., d2) -> INVALID
// 2. diff(d1..., d2...) -> INVALID
//
type diff struct {
message string
err error
}
// urlJoinPath Join a path to existing URL
func urlJoinPath(url1, url2 string) (newURLStr string, err error) {
u1, err := client.Parse(url1)
if err != nil {
return "", iodine.New(err, nil)
}
u2, err := client.Parse(url2)
if err != nil {
return "", iodine.New(err, nil)
}
u1.Path = filepath.Join(u1.Path, u2.Path)
newURLStr = u1.String()
return newURLStr, nil
}
// doDiffObjects - Diff two object URLs
func doDiffObjects(firstURL, secondURL string, ch chan diff) {
_, firstContent, errFirst := url2Stat(firstURL)
_, secondContent, errSecond := url2Stat(secondURL)
switch {
case errFirst != nil && errSecond == nil:
ch <- diff{
message: "Only in ‘" + secondURL + "’",
err: nil,
}
return
case errFirst == nil && errSecond != nil:
ch <- diff{
message: "Only in ‘" + firstURL + "’",
err: nil,
}
return
}
if firstContent.Name == secondContent.Name {
return
}
switch {
case firstContent.Type.IsRegular():
if !secondContent.Type.IsRegular() {
ch <- diff{
message: firstURL + " and " + secondURL + " differs in type.",
err: nil,
}
}
default:
ch <- diff{
message: "‘" + firstURL + "’ is not an object. Please report this bug with ‘--debug’ option.",
err: iodine.New(errNotAnObject{url: firstURL}, nil),
}
return
}
if firstContent.Size != secondContent.Size {
ch <- diff{
message: firstURL + " and " + secondURL + " differs in size.",
err: nil,
}
}
}
func dodiffdirs(firstClnt client.Client, firstURL, secondURL string, recursive bool, ch chan diff) {
for contentCh := range firstClnt.List(recursive) {
if contentCh.Err != nil {
ch <- diff{
message: "Failed to list ‘" + firstURL + "’",
err: iodine.New(contentCh.Err, nil),
}
return
}
newFirstURL, err := urlJoinPath(firstURL, contentCh.Content.Name)
if err != nil {
ch <- diff{
message: "Unable to construct new URL from ‘" + firstURL + "’ using ‘" + contentCh.Content.Name + "’",
err: iodine.New(err, nil),
}
return
}
newSecondURL, err := urlJoinPath(secondURL, contentCh.Content.Name)
if err != nil {
ch <- diff{
message: "Unable to construct new URL from ‘" + secondURL + "’ using ‘" + contentCh.Content.Name + "’",
err: iodine.New(err, nil),
}
return
}
_, newFirstContent, errFirst := url2Stat(newFirstURL)
_, newSecondContent, errSecond := url2Stat(newSecondURL)
switch {
case errFirst != nil && errSecond == nil:
ch <- diff{
message: "‘" + newSecondURL + "’ Only in ‘" + secondURL + "’",
err: nil,
}
continue
case errFirst == nil && errSecond != nil:
ch <- diff{
message: "‘" + newFirstURL + "’ Only in ‘" + firstURL + "’",
err: nil,
}
continue
case errFirst == nil && errSecond == nil:
switch {
case newFirstContent.Type.IsDir():
if !newSecondContent.Type.IsDir() {
ch <- diff{
message: newFirstURL + " and " + newSecondURL + " differs in type.",
err: nil,
}
}
continue
case newFirstContent.Type.IsRegular():
if !newSecondContent.Type.IsRegular() {
ch <- diff{
message: newFirstURL + " and " + newSecondURL + " differs in type.",
err: nil,
}
continue
}
doDiffObjects(newFirstURL, newSecondURL, ch)
}
}
} // End of for-loop
}
// doDiffDirs - Diff two Dir URLs
func doDiffDirs(firstURL, secondURL string, recursive bool, ch chan diff) {
firstClnt, firstContent, err := url2Stat(firstURL)
if err != nil {
ch <- diff{
message: "Failed to stat ‘" + firstURL + "’",
err: iodine.New(err, nil),
}
return
}
_, secondContent, err := url2Stat(secondURL)
if err != nil {
ch <- diff{
message: "Failed to stat ‘" + secondURL + "’",
err: iodine.New(err, nil),
}
return
}
switch {
case firstContent.Type.IsDir():
if !secondContent.Type.IsDir() {
ch <- diff{
message: firstURL + " and " + secondURL + " differs in type.",
err: nil,
}
}
default:
ch <- diff{
message: "‘" + firstURL + "’ is not an object. Please report this bug with ‘--debug’ option.",
err: iodine.New(errNotAnObject{url: firstURL}, nil),
}
return
}
dodiffdirs(firstClnt, firstURL, secondURL, recursive, ch)
}