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
|
// Copyright (C) 2015 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.change;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.MultimapBuilder;
import com.google.gerrit.extensions.common.BlameInfo;
import com.google.gerrit.extensions.common.RangeInfo;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.CacheControl;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.RestReadView;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.git.MergeUtil;
import com.google.gerrit.server.patch.AutoMerger;
import com.google.gerrit.server.project.InvalidChangeOperationException;
import com.google.gitiles.blame.cache.BlameCache;
import com.google.gitiles.blame.cache.Region;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.merge.ThreeWayMergeStrategy;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.kohsuke.args4j.Option;
public class GetBlame implements RestReadView<FileResource> {
private final GitRepositoryManager repoManager;
private final BlameCache blameCache;
private final boolean allowBlame;
private final ThreeWayMergeStrategy mergeStrategy;
private final AutoMerger autoMerger;
@Option(
name = "--base",
aliases = {"-b"},
usage =
"whether to load the blame of the base revision (the direct"
+ " parent of the change) instead of the change")
private boolean base;
@Inject
GetBlame(
GitRepositoryManager repoManager,
BlameCache blameCache,
@GerritServerConfig Config cfg,
AutoMerger autoMerger) {
this.repoManager = repoManager;
this.blameCache = blameCache;
this.mergeStrategy = MergeUtil.getMergeStrategy(cfg);
this.autoMerger = autoMerger;
allowBlame = cfg.getBoolean("change", "allowBlame", true);
}
@Override
public Response<List<BlameInfo>> apply(FileResource resource)
throws RestApiException, OrmException, IOException, InvalidChangeOperationException {
if (!allowBlame) {
throw new BadRequestException("blame is disabled");
}
Project.NameKey project = resource.getRevision().getChange().getProject();
try (Repository repository = repoManager.openRepository(project);
ObjectInserter ins = repository.newObjectInserter();
ObjectReader reader = ins.newReader();
RevWalk revWalk = new RevWalk(reader)) {
String refName =
resource.getRevision().getEdit().isPresent()
? resource.getRevision().getEdit().get().getRefName()
: resource.getRevision().getPatchSet().getRefName();
Ref ref = repository.findRef(refName);
if (ref == null) {
throw new ResourceNotFoundException("unknown ref " + refName);
}
ObjectId objectId = ref.getObjectId();
RevCommit revCommit = revWalk.parseCommit(objectId);
RevCommit[] parents = revCommit.getParents();
String path = resource.getPatchKey().getFileName();
List<BlameInfo> result;
if (!base) {
result = blame(revCommit, path, repository, revWalk);
} else if (parents.length == 0) {
throw new ResourceNotFoundException("Initial commit doesn't have base");
} else if (parents.length == 1) {
result = blame(parents[0], path, repository, revWalk);
} else if (parents.length == 2) {
ObjectId automerge = autoMerger.merge(repository, revWalk, ins, revCommit, mergeStrategy);
result = blame(automerge, path, repository, revWalk);
} else {
throw new ResourceNotFoundException(
"Cannot generate blame for merge commit with more than 2 parents");
}
Response<List<BlameInfo>> r = Response.ok(result);
if (resource.isCacheable()) {
r.caching(CacheControl.PRIVATE(7, TimeUnit.DAYS));
}
return r;
}
}
private List<BlameInfo> blame(ObjectId id, String path, Repository repository, RevWalk revWalk)
throws IOException {
ListMultimap<BlameInfo, RangeInfo> ranges =
MultimapBuilder.hashKeys().arrayListValues().build();
List<BlameInfo> result = new ArrayList<>();
if (blameCache.findLastCommit(repository, id, path) == null) {
return result;
}
List<Region> blameRegions = blameCache.get(repository, id, path);
int from = 1;
for (Region region : blameRegions) {
RevCommit commit = revWalk.parseCommit(region.getSourceCommit());
BlameInfo blameInfo = toBlameInfo(commit, region.getSourceAuthor());
ranges.put(blameInfo, new RangeInfo(from, from + region.getCount() - 1));
from += region.getCount();
}
for (BlameInfo key : ranges.keySet()) {
key.ranges = ranges.get(key);
result.add(key);
}
return result;
}
private static BlameInfo toBlameInfo(RevCommit commit, PersonIdent sourceAuthor) {
BlameInfo blameInfo = new BlameInfo();
blameInfo.author = sourceAuthor.getName();
blameInfo.id = commit.getName();
blameInfo.commitMsg = commit.getFullMessage();
blameInfo.time = commit.getCommitTime();
return blameInfo;
}
}
|
