/
difference.go
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/
difference.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 cmd
import (
"fmt"
"strings"
)
// differType difference in type.
type differType int
const (
differInNone differType = iota // does not differ
differInSize // differs in size
differInType // only in source
differInFirst // only in target
differInSecond // differs in type, exfile/directory
)
func (d differType) String() string {
switch d {
case differInNone:
return ""
case differInSize:
return "size"
case differInType:
return "type"
case differInFirst:
return "only-in-first"
case differInSecond:
return "only-in-second"
}
return "unknown"
}
// objectDifference function finds the difference between all objects
// recursively in sorted order from source and target.
func objectDifference(sourceClnt, targetClnt Client, sourceURL, targetURL string) (diffCh chan diffMessage) {
var (
srcEOF, tgtEOF bool
srcOk, tgtOk bool
srcCtnt, tgtCtnt *clientContent
srcSuffix, tgtSuffix string
)
// Set default values for listing.
isRecursive := true // recursive is always true for diff.
isIncomplete := false // we will not compare any incomplete objects.
srcCh := sourceClnt.List(isRecursive, isIncomplete, DirNone)
tgtCh := targetClnt.List(isRecursive, isIncomplete, DirNone)
diffCh = make(chan diffMessage, 1000)
go func() {
srcCtnt, srcOk = <-srcCh
tgtCtnt, tgtOk = <-tgtCh
for {
srcEOF = !srcOk
tgtEOF = !tgtOk
// No objects from source AND target: Finish
if srcEOF && tgtEOF {
close(diffCh)
break
}
if !srcEOF && srcCtnt.Err != nil {
if isErrIgnored(srcCtnt.Err) {
errorIf(srcCtnt.Err.Trace(sourceURL, targetURL), fmt.Sprintf("Failed on '%s'", sourceURL))
} else {
errorIf(srcCtnt.Err.Trace(sourceURL, targetURL), fmt.Sprintf("Failed on '%s'", sourceURL))
}
srcCtnt, srcOk = <-srcCh
continue
}
if !tgtEOF && tgtCtnt.Err != nil {
if isErrIgnored(tgtCtnt.Err) {
errorIf(tgtCtnt.Err.Trace(sourceURL, targetURL), fmt.Sprintf("Failed on '%s'", targetURL))
} else {
errorIf(tgtCtnt.Err.Trace(sourceURL, targetURL), fmt.Sprintf("Failed on '%s'", targetURL))
}
tgtCtnt, tgtOk = <-tgtCh
continue
}
// If source doesn't have objects anymore, comparison becomes obvious
if srcEOF {
diffCh <- diffMessage{
SecondURL: tgtCtnt.URL.String(),
Diff: differInSecond,
secondContent: tgtCtnt,
}
tgtCtnt, tgtOk = <-tgtCh
continue
}
// The same for target
if tgtEOF {
diffCh <- diffMessage{
FirstURL: srcCtnt.URL.String(),
Diff: differInFirst,
firstContent: srcCtnt,
}
srcCtnt, srcOk = <-srcCh
continue
}
srcSuffix = strings.TrimPrefix(srcCtnt.URL.String(), sourceURL)
tgtSuffix = strings.TrimPrefix(tgtCtnt.URL.String(), targetURL)
current := urlJoinPath(targetURL, srcSuffix)
expected := urlJoinPath(targetURL, tgtSuffix)
if expected > current {
diffCh <- diffMessage{
FirstURL: srcCtnt.URL.String(),
Diff: differInFirst,
firstContent: srcCtnt,
}
srcCtnt, srcOk = <-srcCh
continue
}
if expected == current {
srcType, tgtType := srcCtnt.Type, tgtCtnt.Type
srcSize, tgtSize := srcCtnt.Size, tgtCtnt.Size
if srcType.IsRegular() && !tgtType.IsRegular() ||
!srcType.IsRegular() && tgtType.IsRegular() {
// Type differes. Source is never a directory.
diffCh <- diffMessage{
FirstURL: srcCtnt.URL.String(),
SecondURL: tgtCtnt.URL.String(),
Diff: differInType,
firstContent: srcCtnt,
secondContent: tgtCtnt,
}
} else if (srcType.IsRegular() && tgtType.IsRegular()) && srcSize != tgtSize {
// Regular files differing in size.
diffCh <- diffMessage{
FirstURL: srcCtnt.URL.String(),
SecondURL: tgtCtnt.URL.String(),
Diff: differInSize,
firstContent: srcCtnt,
secondContent: tgtCtnt,
}
}
// No differ
srcCtnt, srcOk = <-srcCh
tgtCtnt, tgtOk = <-tgtCh
continue
}
// Differ in second
diffCh <- diffMessage{
SecondURL: tgtCtnt.URL.String(),
Diff: differInSecond,
secondContent: tgtCtnt,
}
tgtCtnt, tgtOk = <-tgtCh
continue
}
}()
return diffCh
}