1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
// Copyright (C) 2020 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.gitdiff;
import static com.google.common.collect.ImmutableList.toImmutableList;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.gerrit.entities.Patch;
import com.google.gerrit.proto.Protos;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.cache.proto.Cache.ModifiedFilesProto;
import com.google.gerrit.server.cache.serialize.CacheSerializer;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.patch.DiffNotAvailableException;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.Singleton;
import com.google.inject.TypeLiteral;
import com.google.inject.name.Named;
import java.io.IOException;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ExecutionException;
import org.eclipse.jgit.diff.DiffEntry;
import org.eclipse.jgit.diff.DiffEntry.ChangeType;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.util.io.DisabledOutputStream;
/** Implementation of the {@link GitModifiedFilesCache} */
@Singleton
public class GitModifiedFilesCacheImpl implements GitModifiedFilesCache {
private static final String GIT_MODIFIED_FILES = "git_modified_files";
private static final ImmutableMap<ChangeType, Patch.ChangeType> changeTypeMap =
ImmutableMap.of(
DiffEntry.ChangeType.ADD,
Patch.ChangeType.ADDED,
DiffEntry.ChangeType.MODIFY,
Patch.ChangeType.MODIFIED,
DiffEntry.ChangeType.DELETE,
Patch.ChangeType.DELETED,
DiffEntry.ChangeType.RENAME,
Patch.ChangeType.RENAMED,
DiffEntry.ChangeType.COPY,
Patch.ChangeType.COPIED);
private LoadingCache<GitModifiedFilesCacheKey, ImmutableList<ModifiedFile>> cache;
public static Module module() {
return new CacheModule() {
@Override
protected void configure() {
bind(GitModifiedFilesCache.class).to(GitModifiedFilesCacheImpl.class);
persist(
GIT_MODIFIED_FILES,
GitModifiedFilesCacheKey.class,
new TypeLiteral<ImmutableList<ModifiedFile>>() {})
.keySerializer(GitModifiedFilesCacheKey.Serializer.INSTANCE)
.valueSerializer(ValueSerializer.INSTANCE)
// The documentation has some defaults and recommendations for setting the cache
// attributes:
// https://gerrit-review.googlesource.com/Documentation/config-gerrit.html#cache.
.maximumWeight(10 << 20)
.weigher(GitModifiedFilesWeigher.class)
// The cache is using the default disk limit as per section cache.<name>.diskLimit
// in the cache documentation link.
.version(2)
.loader(GitModifiedFilesCacheImpl.Loader.class);
}
};
}
@Inject
public GitModifiedFilesCacheImpl(
@Named(GIT_MODIFIED_FILES)
LoadingCache<GitModifiedFilesCacheKey, ImmutableList<ModifiedFile>> cache) {
this.cache = cache;
}
@Override
public ImmutableList<ModifiedFile> get(GitModifiedFilesCacheKey key)
throws DiffNotAvailableException {
try {
return cache.get(key);
} catch (ExecutionException e) {
throw new DiffNotAvailableException(e);
}
}
static class Loader extends CacheLoader<GitModifiedFilesCacheKey, ImmutableList<ModifiedFile>> {
private final GitRepositoryManager repoManager;
@Inject
Loader(GitRepositoryManager repoManager) {
this.repoManager = repoManager;
}
@Override
public ImmutableList<ModifiedFile> load(GitModifiedFilesCacheKey key) throws IOException {
try (Repository repo = repoManager.openRepository(key.project());
ObjectReader reader = repo.newObjectReader()) {
List<DiffEntry> entries = getGitTreeDiff(repo, reader, key);
return entries.stream().map(Loader::toModifiedFile).collect(toImmutableList());
}
}
private List<DiffEntry> getGitTreeDiff(
Repository repo, ObjectReader reader, GitModifiedFilesCacheKey key) throws IOException {
try (DiffFormatter df = new DiffFormatter(DisabledOutputStream.INSTANCE)) {
df.setReader(reader, repo.getConfig());
if (key.renameDetection()) {
df.setDetectRenames(true);
df.getRenameDetector().setRenameScore(key.renameScore());
}
// Skip detecting content renames for binary files.
df.getRenameDetector().setSkipContentRenamesForBinaryFiles(true);
// The scan method only returns the file paths that are different. Callers may choose to
// format these paths themselves.
return df.scan(key.aTree().equals(ObjectId.zeroId()) ? null : key.aTree(), key.bTree());
}
}
private static ModifiedFile toModifiedFile(DiffEntry entry) {
String oldPath = entry.getOldPath();
String newPath = entry.getNewPath();
return ModifiedFile.builder()
.changeType(toChangeType(entry.getChangeType()))
.oldPath(oldPath.equals(DiffEntry.DEV_NULL) ? Optional.empty() : Optional.of(oldPath))
.newPath(newPath.equals(DiffEntry.DEV_NULL) ? Optional.empty() : Optional.of(newPath))
.build();
}
private static Patch.ChangeType toChangeType(DiffEntry.ChangeType changeType) {
if (!changeTypeMap.containsKey(changeType)) {
throw new IllegalArgumentException("Unsupported type " + changeType);
}
return changeTypeMap.get(changeType);
}
}
public enum ValueSerializer implements CacheSerializer<ImmutableList<ModifiedFile>> {
INSTANCE;
@Override
public byte[] serialize(ImmutableList<ModifiedFile> modifiedFiles) {
ModifiedFilesProto.Builder builder = ModifiedFilesProto.newBuilder();
modifiedFiles.forEach(
f -> builder.addModifiedFile(ModifiedFile.Serializer.INSTANCE.toProto(f)));
return Protos.toByteArray(builder.build());
}
@Override
public ImmutableList<ModifiedFile> deserialize(byte[] in) {
ImmutableList.Builder<ModifiedFile> modifiedFiles = ImmutableList.builder();
ModifiedFilesProto modifiedFilesProto =
Protos.parseUnchecked(ModifiedFilesProto.parser(), in);
modifiedFilesProto
.getModifiedFileList()
.forEach(f -> modifiedFiles.add(ModifiedFile.Serializer.INSTANCE.fromProto(f)));
return modifiedFiles.build();
}
}
}
|
