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com.google.gerrit.server.patch.PatchScriptBuilder Maven / Gradle / Ivy
// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.server.patch;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.collect.ImmutableSet.toImmutableSet;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.gerrit.common.data.PatchScript;
import com.google.gerrit.common.data.PatchScript.DisplayMethod;
import com.google.gerrit.entities.FixReplacement;
import com.google.gerrit.entities.Patch;
import com.google.gerrit.entities.Patch.ChangeType;
import com.google.gerrit.entities.Patch.PatchType;
import com.google.gerrit.extensions.client.DiffPreferencesInfo;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.server.fixes.FixCalculator;
import com.google.gerrit.server.mime.FileTypeRegistry;
import com.google.gerrit.server.patch.DiffContentCalculator.DiffCalculatorResult;
import com.google.gerrit.server.patch.DiffContentCalculator.TextSource;
import com.google.gerrit.server.patch.filediff.FileDiffOutput;
import com.google.gerrit.server.patch.filediff.TaggedEdit;
import com.google.inject.Inject;
import eu.medsea.mimeutil.MimeType;
import eu.medsea.mimeutil.MimeUtil2;
import java.io.IOException;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import org.eclipse.jgit.diff.Edit;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;
class PatchScriptBuilder {
private DiffPreferencesInfo diffPrefs;
private final FileTypeRegistry registry;
private IntraLineDiffCalculator intralineDiffCalculator;
@Inject
PatchScriptBuilder(FileTypeRegistry ftr) {
registry = ftr;
}
void setDiffPrefs(DiffPreferencesInfo dp) {
diffPrefs = dp;
}
void setIntraLineDiffCalculator(IntraLineDiffCalculator calculator) {
intralineDiffCalculator = calculator;
}
/** Convert into {@link PatchScript} using the new diff cache output. */
PatchScript toPatchScript(Repository git, FileDiffOutput content) throws IOException {
PatchFileChange change =
new PatchFileChange(
content.edits().stream().map(TaggedEdit::jgitEdit).collect(toImmutableList()),
content.edits().stream()
.filter(TaggedEdit::dueToRebase)
.map(TaggedEdit::jgitEdit)
.collect(toImmutableSet()),
content.headerLines(),
FilePathAdapter.getOldPath(content.oldPath(), content.changeType()),
FilePathAdapter.getNewPath(content.oldPath(), content.newPath(), content.changeType()),
content.changeType(),
content.patchType().orElse(null));
SidesResolver sidesResolver = new SidesResolver(git, content.comparisonType());
ResolvedSides sides =
resolveSides(
git,
sidesResolver,
oldName(change),
newName(change),
content.oldCommitId(),
content.newCommitId());
return build(sides.a, sides.b, change);
}
private ResolvedSides resolveSides(
Repository git,
SidesResolver sidesResolver,
String oldName,
String newName,
ObjectId aId,
ObjectId bId)
throws IOException {
try (ObjectReader reader = git.newObjectReader()) {
PatchSide a = sidesResolver.resolve(registry, reader, oldName, null, aId, true);
PatchSide b =
sidesResolver.resolve(registry, reader, newName, a, bId, Objects.equals(aId, bId));
return new ResolvedSides(a, b);
}
}
PatchScript toPatchScript(
Repository git, ObjectId baseId, String fileName, List fixReplacements)
throws IOException, ResourceConflictException, ResourceNotFoundException {
SidesResolver sidesResolver = new SidesResolver(git, ComparisonType.againstOtherPatchSet());
PatchSide a = resolveSideA(git, sidesResolver, fileName, baseId);
if (a.mode == FileMode.MISSING) {
throw new ResourceNotFoundException(String.format("File %s not found", fileName));
}
FixCalculator.FixResult fixResult = FixCalculator.calculateFix(a.src, fixReplacements);
PatchSide b =
new PatchSide(
null,
fileName,
ObjectId.zeroId(),
a.mode,
fixResult.text.getContent(),
fixResult.text,
a.mimeType,
a.displayMethod,
a.fileMode);
PatchFileChange change =
new PatchFileChange(
fixResult.edits,
ImmutableSet.of(),
ImmutableList.of(),
fileName,
fileName,
ChangeType.MODIFIED,
PatchType.UNIFIED);
return build(a, b, change);
}
private PatchSide resolveSideA(
Repository git, SidesResolver sidesResolver, String path, ObjectId baseId)
throws IOException {
try (ObjectReader reader = git.newObjectReader()) {
return sidesResolver.resolve(registry, reader, path, null, baseId, true);
}
}
private PatchScript build(PatchSide a, PatchSide b, PatchFileChange content) {
ImmutableList contentEdits = content.getEdits();
ImmutableSet editsDueToRebase = content.getEditsDueToRebase();
IntraLineDiffCalculatorResult intralineResult = IntraLineDiffCalculatorResult.NO_RESULT;
if (isModify(content) && intralineDiffCalculator != null && isIntralineModeAllowed(b)) {
intralineResult =
intralineDiffCalculator.calculateIntraLineDiff(
contentEdits, editsDueToRebase, a.id, b.id, a.src, b.src, b.treeId, b.path);
}
ImmutableList finalEdits = intralineResult.edits.orElse(contentEdits);
DiffContentCalculator calculator = new DiffContentCalculator(diffPrefs);
DiffCalculatorResult diffCalculatorResult =
calculator.calculateDiffContent(new TextSource(a.src), new TextSource(b.src), finalEdits);
return new PatchScript(
content.getChangeType(),
content.getOldName(),
content.getNewName(),
a.fileMode,
b.fileMode,
content.getHeaderLines(),
diffPrefs,
diffCalculatorResult.diffContent.a,
diffCalculatorResult.diffContent.b,
diffCalculatorResult.edits,
editsDueToRebase,
a.displayMethod,
b.displayMethod,
a.mimeType,
b.mimeType,
intralineResult.failure,
intralineResult.timeout,
content.getPatchType() == Patch.PatchType.BINARY,
a.treeId == null ? null : a.treeId.getName(),
b.treeId == null ? null : b.treeId.getName());
}
private static boolean isModify(PatchFileChange content) {
switch (content.getChangeType()) {
case MODIFIED:
case COPIED:
case RENAMED:
case REWRITE:
return true;
case ADDED:
case DELETED:
default:
return false;
}
}
private static String oldName(PatchFileChange entry) {
switch (entry.getChangeType()) {
case ADDED:
return null;
case DELETED:
case MODIFIED:
return entry.getNewName();
case COPIED:
case RENAMED:
case REWRITE:
default:
return entry.getOldName();
}
}
private static String newName(PatchFileChange entry) {
switch (entry.getChangeType()) {
case DELETED:
return null;
case ADDED:
case MODIFIED:
case COPIED:
case RENAMED:
case REWRITE:
default:
return entry.getNewName();
}
}
private static boolean isIntralineModeAllowed(PatchSide side) {
// The intraline diff cache keys are the same for these cases. It's better to not show
// intraline results than showing completely wrong diffs or to run into a server error.
return !Patch.isMagic(side.path) && !isSubmoduleCommit(side.mode);
}
private static boolean isSubmoduleCommit(FileMode mode) {
return mode.getObjectType() == Constants.OBJ_COMMIT;
}
private static class PatchSide {
final ObjectId treeId;
final String path;
final ObjectId id;
final FileMode mode;
final byte[] srcContent;
final Text src;
final String mimeType;
final DisplayMethod displayMethod;
final PatchScript.FileMode fileMode;
private PatchSide(
ObjectId treeId,
String path,
ObjectId id,
FileMode mode,
byte[] srcContent,
Text src,
String mimeType,
DisplayMethod displayMethod,
PatchScript.FileMode fileMode) {
this.treeId = treeId;
this.path = path;
this.id = id;
this.mode = mode;
this.srcContent = srcContent;
this.src = src;
this.mimeType = mimeType;
this.displayMethod = displayMethod;
this.fileMode = fileMode;
}
}
private static class ResolvedSides {
// Not an @AutoValue because PatchSide can't be AutoValue
public final PatchSide a;
public final PatchSide b;
ResolvedSides(PatchSide a, PatchSide b) {
this.a = a;
this.b = b;
}
}
static class SidesResolver {
private final Repository db;
private final ComparisonType comparisonType;
SidesResolver(Repository db, ComparisonType comparisonType) {
this.db = db;
this.comparisonType = comparisonType;
}
PatchSide resolve(
final FileTypeRegistry registry,
final ObjectReader reader,
final String path,
final PatchSide other,
final ObjectId within,
final boolean isWithinEqualsA)
throws IOException {
try {
boolean isCommitMsg = Patch.COMMIT_MSG.equals(path);
boolean isMergeList = Patch.MERGE_LIST.equals(path);
if (isCommitMsg || isMergeList) {
if (comparisonType.isAgainstParentOrAutoMerge() && isWithinEqualsA) {
return createSide(
within,
path,
ObjectId.zeroId(),
FileMode.MISSING,
Text.NO_BYTES,
Text.EMPTY,
MimeUtil2.UNKNOWN_MIME_TYPE.toString(),
DisplayMethod.NONE,
false);
}
Text src =
isCommitMsg
? Text.forCommit(reader, within)
: Text.forMergeList(comparisonType, reader, within);
byte[] srcContent = src.getContent();
DisplayMethod displayMethod;
FileMode mode;
if (src == Text.EMPTY) {
mode = FileMode.MISSING;
displayMethod = DisplayMethod.NONE;
} else {
mode = FileMode.REGULAR_FILE;
displayMethod = DisplayMethod.DIFF;
}
return createSide(
within,
path,
within,
mode,
srcContent,
src,
MimeUtil2.UNKNOWN_MIME_TYPE.toString(),
displayMethod,
false);
}
final TreeWalk tw = find(reader, path, within);
ObjectId id = tw != null ? tw.getObjectId(0) : ObjectId.zeroId();
FileMode mode = tw != null ? tw.getFileMode(0) : FileMode.MISSING;
boolean reuse =
other != null
&& other.id.equals(id)
&& (other.mode == mode || isBothFile(other.mode, mode));
Text src = null;
byte[] srcContent;
if (reuse) {
srcContent = other.srcContent;
} else {
srcContent = SrcContentResolver.getSourceContent(db, id, mode);
}
String mimeType = MimeUtil2.UNKNOWN_MIME_TYPE.toString();
DisplayMethod displayMethod = DisplayMethod.DIFF;
if (reuse) {
mimeType = other.mimeType;
displayMethod = other.displayMethod;
src = other.src;
} else if (srcContent.length > 0 && FileMode.SYMLINK != mode) {
MimeType registryMimeType = registry.getMimeType(path, srcContent);
if ("image".equals(registryMimeType.getMediaType())
&& registry.isSafeInline(registryMimeType)) {
displayMethod = DisplayMethod.IMG;
}
mimeType = registryMimeType.toString();
}
return createSide(within, path, id, mode, srcContent, src, mimeType, displayMethod, reuse);
} catch (IOException err) {
throw new IOException("Cannot read " + within.name() + ":" + path, err);
}
}
private PatchSide createSide(
ObjectId treeId,
String path,
ObjectId id,
FileMode mode,
byte[] srcContent,
Text src,
String mimeType,
DisplayMethod displayMethod,
boolean reuse) {
if (!reuse) {
if (srcContent == Text.NO_BYTES) {
src = Text.EMPTY;
} else {
src = new Text(srcContent);
}
}
if (mode == FileMode.MISSING) {
displayMethod = DisplayMethod.NONE;
}
PatchScript.FileMode fileMode = PatchScript.FileMode.fromJgitFileMode(mode);
return new PatchSide(
treeId, path, id, mode, srcContent, src, mimeType, displayMethod, fileMode);
}
private TreeWalk find(ObjectReader reader, String path, ObjectId within) throws IOException {
if (path == null || within == null) {
return null;
}
try (RevWalk rw = new RevWalk(reader)) {
final RevTree tree = rw.parseTree(within);
return TreeWalk.forPath(reader, path, tree);
}
}
}
private static boolean isBothFile(FileMode a, FileMode b) {
return (a.getBits() & FileMode.TYPE_FILE) == FileMode.TYPE_FILE
&& (b.getBits() & FileMode.TYPE_FILE) == FileMode.TYPE_FILE;
}
static class IntraLineDiffCalculatorResult {
// Not an @AutoValue because Edit is mutable
final boolean failure;
final boolean timeout;
private final Optional> edits;
private IntraLineDiffCalculatorResult(
Optional> edits, boolean failure, boolean timeout) {
this.failure = failure;
this.timeout = timeout;
this.edits = edits;
}
static final IntraLineDiffCalculatorResult NO_RESULT =
new IntraLineDiffCalculatorResult(Optional.empty(), false, false);
static final IntraLineDiffCalculatorResult FAILURE =
new IntraLineDiffCalculatorResult(Optional.empty(), true, false);
static final IntraLineDiffCalculatorResult TIMEOUT =
new IntraLineDiffCalculatorResult(Optional.empty(), false, true);
static IntraLineDiffCalculatorResult success(ImmutableList edits) {
return new IntraLineDiffCalculatorResult(Optional.of(edits), false, false);
}
}
interface IntraLineDiffCalculator {
IntraLineDiffCalculatorResult calculateIntraLineDiff(
ImmutableList edits,
Set editsDueToRebase,
ObjectId aId,
ObjectId bId,
Text aSrc,
Text bSrc,
ObjectId bTreeId,
String bPath);
}
static class PatchFileChange {
private final ImmutableList edits;
private final ImmutableSet editsDueToRebase;
private final ImmutableList headerLines;
private final String oldName;
private final String newName;
private final ChangeType changeType;
private final Patch.PatchType patchType;
public PatchFileChange(
ImmutableList edits,
ImmutableSet editsDueToRebase,
ImmutableList headerLines,
String oldName,
String newName,
ChangeType changeType,
Patch.PatchType patchType) {
this.edits = edits;
this.editsDueToRebase = editsDueToRebase;
this.headerLines = headerLines;
this.oldName = oldName;
this.newName = newName;
this.changeType = changeType;
this.patchType = patchType;
}
ImmutableList getEdits() {
return edits;
}
ImmutableSet getEditsDueToRebase() {
return editsDueToRebase;
}
ImmutableList getHeaderLines() {
return headerLines;
}
String getNewName() {
return newName;
}
String getOldName() {
return oldName;
}
ChangeType getChangeType() {
return changeType;
}
Patch.PatchType getPatchType() {
return patchType;
}
}
}
