Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 306:971baa95fb07

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Experimental code to build file history, handy access to changeset added
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Sep 2011 04:05:41 +0200
parents ae8d116f4ee2
children 09628675bcee
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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19 import static org.tmatesoft.hg.repo.HgInternals.wrongLocalRevision;
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20 import static org.tmatesoft.hg.repo.HgRepository.*;
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22 import java.io.ByteArrayOutputStream;
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23 import java.io.File;
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24 import java.io.FileInputStream;
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25 import java.io.IOException;
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26 import java.nio.ByteBuffer;
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27 import java.nio.channels.FileChannel;
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28 import java.util.ArrayList;
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29 import java.util.Arrays;
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30 import java.util.Collection;
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31 import java.util.Collections;
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32 import java.util.List;
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33 import java.util.NoSuchElementException;
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34
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35 import org.tmatesoft.hg.core.HgDataStreamException;
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36 import org.tmatesoft.hg.core.HgException;
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37 import org.tmatesoft.hg.core.Nodeid;
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38 import org.tmatesoft.hg.internal.DataAccess;
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39 import org.tmatesoft.hg.internal.Experimental;
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40 import org.tmatesoft.hg.internal.FilterByteChannel;
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41 import org.tmatesoft.hg.internal.FilterDataAccess;
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42 import org.tmatesoft.hg.internal.IntMap;
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43 import org.tmatesoft.hg.internal.RevlogStream;
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44 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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45 import org.tmatesoft.hg.util.ByteChannel;
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46 import org.tmatesoft.hg.util.CancelSupport;
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47 import org.tmatesoft.hg.util.CancelledException;
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48 import org.tmatesoft.hg.util.Pair;
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49 import org.tmatesoft.hg.util.Path;
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50 import org.tmatesoft.hg.util.ProgressSupport;
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54 /**
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55 * ? name:HgFileNode?
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56 *
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57 * @author Artem Tikhomirov
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58 * @author TMate Software Ltd.
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59 */
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60 public class HgDataFile extends Revlog {
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62 // absolute from repo root?
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63 // slashes, unix-style?
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64 // repo location agnostic, just to give info to user, not to access real storage
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65 private final Path path;
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66 private Metadata metadata; // get initialized on first access to file content.
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68 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath, RevlogStream content) {
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69 super(hgRepo, content);
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70 path = filePath;
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71 }
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73 /*package-local*/HgDataFile(HgRepository hgRepo, Path filePath) {
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74 super(hgRepo);
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75 path = filePath;
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76 }
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78 // exists is not the best name possible. now it means no file with such name was ever known to the repo.
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79 // it might be confused with files existed before but lately removed.
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80 public boolean exists() {
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81 return content != null; // XXX need better impl
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82 }
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84 // human-readable (i.e. "COPYING", not "store/data/_c_o_p_y_i_n_g.i")
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85 public Path getPath() {
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86 return path; // hgRepo.backresolve(this) -> name? In this case, what about hashed long names?
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87 }
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89 /**
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90 * @return size of the file content at the given revision
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91 */
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92 public int length(Nodeid nodeid) throws HgDataStreamException {
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93 return length(getLocalRevision(nodeid));
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95 }
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97 /**
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98 * @return size of the file content at the revision identified by local revision number.
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99 */
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100 public int length(int localRev) throws HgDataStreamException {
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101 if (metadata == null || !metadata.checked(localRev)) {
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102 checkAndRecordMetadata(localRev);
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103 }
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104 final int dataLen = content.dataLength(localRev);
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105 if (metadata.known(localRev)) {
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106 return dataLen - metadata.dataOffset(localRev);
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107 }
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108 return dataLen;
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109 }
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111 /**
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112 * Reads content of the file from working directory. If file present in the working directory, its actual content without
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113 * any filters is supplied through the sink. If file does not exist in the working dir, this method provides content of a file
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114 * as if it would be refreshed in the working copy, i.e. its corresponding revision
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115 * (XXX according to dirstate? file tip?) is read from the repository, and filters repo -> working copy get applied.
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116 *
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117 * @param sink where to pipe content to
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118 * @throws HgDataStreamException to indicate troubles reading repository file
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119 * @throws CancelledException if operation was cancelled
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120 */
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121 public void workingCopy(ByteChannel sink) throws HgDataStreamException, CancelledException {
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122 File f = getRepo().getFile(this);
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123 if (f.exists()) {
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124 final CancelSupport cs = CancelSupport.Factory.get(sink);
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125 final ProgressSupport progress = ProgressSupport.Factory.get(sink);
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126 final long flength = f.length();
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127 final int bsize = (int) Math.min(flength, 32*1024);
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128 progress.start((int) (flength > Integer.MAX_VALUE ? flength >>> 15 /*32 kb buf size*/ : flength));
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129 ByteBuffer buf = ByteBuffer.allocate(bsize);
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130 FileChannel fc = null;
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131 try {
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132 fc = new FileInputStream(f).getChannel();
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133 while (fc.read(buf) != -1) {
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134 cs.checkCancelled();
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135 buf.flip();
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136 int consumed = sink.write(buf);
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137 progress.worked(flength > Integer.MAX_VALUE ? 1 : consumed);
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138 buf.compact();
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139 }
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140 } catch (IOException ex) {
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141 throw new HgDataStreamException(getPath(), ex);
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142 } finally {
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143 progress.done();
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144 if (fc != null) {
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145 try {
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146 fc.close();
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147 } catch (IOException ex) {
295
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148 getRepo().getContext().getLog().info(getClass(), ex, null);
237
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149 }
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150 }
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151 }
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152 } else {
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153 contentWithFilters(TIP, sink);
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154 }
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155 }
115
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156
157
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157 // public void content(int revision, ByteChannel sink, boolean applyFilters) throws HgDataStreamException, IOException, CancelledException {
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158 // byte[] content = content(revision);
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159 // final CancelSupport cancelSupport = CancelSupport.Factory.get(sink);
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160 // final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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161 // ByteBuffer buf = ByteBuffer.allocate(512);
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162 // int left = content.length;
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163 // progressSupport.start(left);
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164 // int offset = 0;
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165 // cancelSupport.checkCancelled();
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166 // ByteChannel _sink = applyFilters ? new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())) : sink;
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167 // do {
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168 // buf.put(content, offset, Math.min(left, buf.remaining()));
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169 // buf.flip();
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170 // cancelSupport.checkCancelled();
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171 // // XXX I may not rely on returned number of bytes but track change in buf position instead.
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172 // int consumed = _sink.write(buf);
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173 // buf.compact();
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174 // offset += consumed;
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175 // left -= consumed;
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176 // progressSupport.worked(consumed);
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177 // } while (left > 0);
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178 // progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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179 // }
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180
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181 /*XXX not sure distinct method contentWithFilters() is the best way to do, perhaps, callers shall add filters themselves?*/
237
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182 public void contentWithFilters(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException {
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183 if (revision == WORKING_COPY) {
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184 workingCopy(sink); // pass un-mangled sink
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185 } else {
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186 content(revision, new FilterByteChannel(sink, getRepo().getFiltersFromRepoToWorkingDir(getPath())));
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187 }
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188 }
22
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189
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190 // for data files need to check heading of the file content for possible metadata
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191 // @see http://mercurial.selenic.com/wiki/FileFormats#data.2BAC8-
237
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192 public void content(int revision, ByteChannel sink) throws HgDataStreamException, CancelledException {
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193 if (revision == TIP) {
135
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194 revision = getLastRevision();
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195 }
157
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196 if (revision == WORKING_COPY) {
237
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197 // sink is supposed to come into workingCopy without filters
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198 // thus we shall not get here (into #content) from #contentWithFilters(WC)
157
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199 workingCopy(sink);
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200 return;
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201 }
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202 if (wrongLocalRevision(revision) || revision == BAD_REVISION) {
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203 throw new IllegalArgumentException(String.valueOf(revision));
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204 }
157
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205 if (sink == null) {
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206 throw new IllegalArgumentException();
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207 }
134
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208 if (metadata == null) {
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209 metadata = new Metadata();
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210 }
277
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211 ErrorHandlingInspector insp;
134
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212 if (metadata.none(revision)) {
157
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213 insp = new ContentPipe(sink, 0);
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214 } else if (metadata.known(revision)) {
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215 insp = new ContentPipe(sink, metadata.dataOffset(revision));
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216 } else {
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217 // do not know if there's metadata
277
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218 insp = new MetadataInspector(metadata, getPath(), new ContentPipe(sink, 0));
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219 }
157
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220 insp.checkCancelled();
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221 super.content.iterate(revision, revision, true, insp);
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222 try {
237
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223 insp.checkFailed(); // XXX is there real need to throw IOException from ContentPipe?
157
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224 } catch (HgDataStreamException ex) {
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225 throw ex;
237
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226 } catch (IOException ex) {
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227 throw new HgDataStreamException(getPath(), ex);
157
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228 } catch (HgException ex) {
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229 // shall not happen, unless we changed ContentPipe or its subclass
215
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230 throw new HgDataStreamException(getPath(), ex.getClass().getName(), ex);
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231 }
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232 }
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233
305
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234 @Experimental(reason="Investigate approaches to build complete file history log")
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235 public interface HistoryWalker {
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236 void next();
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237 boolean hasNext();
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238 Nodeid changesetRevision();
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239 RawChangeset changeset();
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240 boolean isFork();
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241 boolean isJoin();
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242 Pair<Nodeid, Nodeid> parentChangesets();
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243 Collection<Nodeid> childChangesets();
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244 }
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245
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246 public HistoryWalker history() {
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247 final boolean[] needsSorting = { false };
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248 class HistoryNode {
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249 int changeset;
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250 Nodeid cset;
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251 HistoryNode parent1, parent2;
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252 List<HistoryNode> children;
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253
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254 public HistoryNode(int cs, HistoryNode p1, HistoryNode p2) {
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255 changeset = cs;
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256 parent1 = p1;
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257 parent2 = p2;
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258 if (p1 != null) {
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259 p1.addChild(this);
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260 }
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261 if (p2 != null) {
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262 p2.addChild(this);
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263 }
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264 }
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265
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266 public Nodeid changesetRevision() {
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267 if (cset == null) {
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268 cset = getRepo().getChangelog().getRevision(changeset);
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269 }
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270 return cset;
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271 }
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272
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273 public void addChild(HistoryNode child) {
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274 if (children == null) {
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275 children = new ArrayList<HistoryNode>(2);
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276 }
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277 children.add(child);
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278 }
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279 }
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280 final HistoryNode[] completeHistory = new HistoryNode[getRevisionCount()];
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281 final int[] commitRevisions = new int[completeHistory.length];
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282 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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283 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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284 if (revisionNumber > 0) {
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285 if (commitRevisions[revisionNumber-1] > linkRevision) {
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286 needsSorting[0] = true;
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287 }
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288 }
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289 HistoryNode p1 = null, p2 = null;
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290 if (parent1Revision != -1) {
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291 p1 = completeHistory[parent1Revision];
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292 }
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293 if (parent2Revision != -1) {
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294 p2 = completeHistory[parent2Revision];
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295 }
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296 completeHistory[revisionNumber] = new HistoryNode(linkRevision, p1, p2);
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297 }
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298 };
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299 content.iterate(0, getLastRevision(), false, insp);
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300 // XXX may read changeset revisions at once (to avoid numerous changelog.getRevision reads)
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301 // but perhaps just nodeids, not RawChangeset (changelog.iterate(data=false)
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302 // XXX sort completeHistory according to changeset numbers?
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303 return new HistoryWalker() {
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304 private int index = -1;
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305
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306 public void next() {
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307 if (!hasNext()) {
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308 throw new NoSuchElementException();
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309 }
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310 index++;
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311 }
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312
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313 public boolean hasNext() {
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314 return index+1 < completeHistory.length;
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315 }
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316
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317 public Pair<Nodeid, Nodeid> parentChangesets() {
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318 HistoryNode p;
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319 Nodeid p1, p2;
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320 if ((p = completeHistory[index].parent1) != null) {
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321 p1 = p.changesetRevision();
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322 } else {
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323 p1 = Nodeid.NULL;
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324 }
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325 if ((p = completeHistory[index].parent2) != null) {
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326 p2 = p.changesetRevision();
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327 } else {
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328 p2 = Nodeid.NULL;
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329 }
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330 return new Pair<Nodeid, Nodeid>(p1, p2);
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331 }
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332
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333 public boolean isJoin() {
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334 return completeHistory[index].parent1 != null && completeHistory[index].parent2 != null;
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335 }
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336
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337 public boolean isFork() {
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338 HistoryNode n = completeHistory[index];
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339 return n.children != null && n.children.size() > 1;
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340 }
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341
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342 public Collection<Nodeid> childChangesets() {
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343 HistoryNode n = completeHistory[index];
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344 if (n.children == null) {
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345 return Collections.emptyList();
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346 }
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347 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(n.children.size());
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348 for (HistoryNode hn : n.children) {
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349 rv.add(hn.changesetRevision());
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350 }
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351 return rv;
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352 }
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353
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354 public Nodeid changesetRevision() {
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355 return completeHistory[index].changesetRevision();
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356 }
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357
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358 public RawChangeset changeset() {
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359 final int cs = completeHistory[index].changeset;
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360 return getRepo().getChangelog().range(cs, cs).get(0);
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361 }
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362 };
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363 }
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364
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365 public void history(HgChangelog.Inspector inspector) {
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366 history(0, getLastRevision(), inspector);
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367 }
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368
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369 public void history(int start, int end, HgChangelog.Inspector inspector) {
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370 if (!exists()) {
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371 throw new IllegalStateException("Can't get history of invalid repository file node");
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372 }
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373 final int last = getLastRevision();
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374 if (end == TIP) {
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375 end = last;
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376 }
300
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377 if (start == TIP) {
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378 start = last;
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379 }
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380 HgInternals.checkRevlogRange(start, end, last);
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381
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382 final int[] commitRevisions = new int[end - start + 1];
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383 final boolean[] needsSorting = { false };
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384 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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385 int count = 0;
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386 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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387 if (count > 0) {
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388 if (commitRevisions[count -1] > linkRevision) {
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389 needsSorting[0] = true;
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390 }
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391 }
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392 commitRevisions[count++] = linkRevision;
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393 }
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394 };
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395 content.iterate(start, end, false, insp);
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396 final HgChangelog changelog = getRepo().getChangelog();
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397 if (needsSorting[0]) {
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398 // automatic tools (svnmerge?) produce unnatural file history
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399 // (e.g. cpython/Lib/doctest.py, revision 164 points to cset 63509, 165 - to 38453)
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400 Arrays.sort(commitRevisions);
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401 }
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402 changelog.rangeInternal(inspector, commitRevisions);
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403 }
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404
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405 // for a given local revision of the file, find out local revision in the changelog
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406 public int getChangesetLocalRevision(int revision) {
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407 return content.linkRevision(revision);
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408 }
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409
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410 public Nodeid getChangesetRevision(Nodeid nid) {
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411 int changelogRevision = getChangesetLocalRevision(getLocalRevision(nid));
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412 return getRepo().getChangelog().getRevision(changelogRevision);
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413 }
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414
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415 public boolean isCopy() throws HgDataStreamException {
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416 if (metadata == null || !metadata.checked(0)) {
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417 checkAndRecordMetadata(0);
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418 }
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419 if (!metadata.known(0)) {
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420 return false;
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421 }
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422 return metadata.find(0, "copy") != null;
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423 }
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424
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425 public Path getCopySourceName() throws HgDataStreamException {
78
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426 if (isCopy()) {
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427 return Path.create(metadata.find(0, "copy"));
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428 }
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429 throw new UnsupportedOperationException(); // XXX REVISIT, think over if Exception is good (clients would check isCopy() anyway, perhaps null is sufficient?)
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430 }
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diff changeset
431
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diff changeset
432 public Nodeid getCopySourceRevision() throws HgDataStreamException {
78
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433 if (isCopy()) {
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434 return Nodeid.fromAscii(metadata.find(0, "copyrev")); // XXX reuse/cache Nodeid
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435 }
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436 throw new UnsupportedOperationException();
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diff changeset
437 }
88
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diff changeset
438
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439 @Override
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440 public String toString() {
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441 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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442 sb.append('(');
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443 sb.append(getPath());
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444 sb.append(')');
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445 return sb.toString();
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446 }
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447
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diff changeset
448 private void checkAndRecordMetadata(int localRev) throws HgDataStreamException {
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449 // content() always initializes metadata.
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450 // FIXME this is expensive way to find out metadata, distinct RevlogStream.Iterator would be better.
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451 // Alternatively, may parameterize MetadataContentPipe to do prepare only.
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452 // For reference, when throwing CancelledException, hg status -A --rev 3:80 takes 70 ms
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453 // however, if we just consume buffer instead (buffer.position(buffer.limit()), same command takes ~320ms
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454 // (compared to command-line counterpart of 190ms)
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diff changeset
455 try {
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456 content(localRev, new ByteChannel() { // No-op channel
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457 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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458 throw new CancelledException();
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459 }
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diff changeset
460 });
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461 } catch (CancelledException ex) {
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462 // it's ok, we did that
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463 } catch (Exception ex) {
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464 throw new HgDataStreamException(getPath(), "Can't initialize metadata", ex).setRevisionNumber(localRev);
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465 }
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diff changeset
466 }
78
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diff changeset
467
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468 private static final class MetadataEntry {
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469 private final String entry;
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470 private final int valueStart;
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471 /*package-local*/MetadataEntry(String key, String value) {
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472 entry = key + value;
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473 valueStart = key.length();
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474 }
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475 /*package-local*/boolean matchKey(String key) {
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476 return key.length() == valueStart && entry.startsWith(key);
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477 }
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478 // uncomment once/if needed
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479 // public String key() {
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480 // return entry.substring(0, valueStart);
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481 // }
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482 public String value() {
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483 return entry.substring(valueStart);
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484 }
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485 }
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486
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487 private static class Metadata {
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488 private static class Record {
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489 public final int offset;
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490 public final MetadataEntry[] entries;
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491
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492 public Record(int off, MetadataEntry[] entr) {
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493 offset = off;
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494 entries = entr;
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495 }
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496 }
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497 // XXX sparse array needed
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498 private final IntMap<Record> entries = new IntMap<Record>(5);
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499
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500 private final Record NONE = new Record(-1, null); // don't want statics
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501
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502 // true when there's metadata for given revision
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503 boolean known(int revision) {
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504 Record i = entries.get(revision);
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505 return i != null && NONE != i;
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506 }
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507
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508 // true when revision has been checked for metadata presence.
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509 public boolean checked(int revision) {
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510 return entries.containsKey(revision);
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511 }
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512
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513 // true when revision has been checked and found not having any metadata
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514 boolean none(int revision) {
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515 Record i = entries.get(revision);
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516 return i == NONE;
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517 }
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518
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519 // mark revision as having no metadata.
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520 void recordNone(int revision) {
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521 Record i = entries.get(revision);
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522 if (i == NONE) {
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523 return; // already there
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524 }
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525 if (i != null) {
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526 throw new IllegalStateException(String.format("Trying to override Metadata state for revision %d (known offset: %d)", revision, i));
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527 }
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528 entries.put(revision, NONE);
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529 }
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530
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531 // since this is internal class, callers are supposed to ensure arg correctness (i.e. ask known() before)
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532 int dataOffset(int revision) {
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533 return entries.get(revision).offset;
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534 }
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535 void add(int revision, int dataOffset, Collection<MetadataEntry> e) {
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536 assert !entries.containsKey(revision);
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537 entries.put(revision, new Record(dataOffset, e.toArray(new MetadataEntry[e.size()])));
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538 }
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539
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540 String find(int revision, String key) {
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541 for (MetadataEntry me : entries.get(revision).entries) {
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542 if (me.matchKey(key)) {
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543 return me.value();
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544 }
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545 }
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546 return null;
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547 }
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548 }
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549
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550 private static class MetadataInspector extends ErrorHandlingInspector implements RevlogStream.Inspector {
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551 private final Metadata metadata;
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552 private final Path fname; // need this only for error reporting
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553 private final RevlogStream.Inspector delegate;
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554
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555 public MetadataInspector(Metadata _metadata, Path file, RevlogStream.Inspector chain) {
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556 metadata = _metadata;
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557 fname = file;
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558 delegate = chain;
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559 setCancelSupport(CancelSupport.Factory.get(chain));
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560 }
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561
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562 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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563 try {
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564 final int daLength = data.length();
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565 if (daLength < 4 || data.readByte() != 1 || data.readByte() != 10) {
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566 metadata.recordNone(revisionNumber);
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567 data.reset();
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568 } else {
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569 ArrayList<MetadataEntry> _metadata = new ArrayList<MetadataEntry>();
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570 int offset = parseMetadata(data, daLength, _metadata);
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571 metadata.add(revisionNumber, offset, _metadata);
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572 // da is in prepared state (i.e. we consumed all bytes up to metadata end).
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573 // However, it's not safe to assume delegate won't call da.reset() for some reason,
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574 // and we need to ensure predictable result.
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575 data.reset();
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576 data = new FilterDataAccess(data, offset, daLength - offset);
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577 }
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578 if (delegate != null) {
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579 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, data);
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580 }
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581 } catch (IOException ex) {
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582 recordFailure(ex);
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583 } catch (HgDataStreamException ex) {
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584 recordFailure(ex.setRevisionNumber(revisionNumber));
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585 }
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586 }
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587
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588 private int parseMetadata(DataAccess data, final int daLength, ArrayList<MetadataEntry> _metadata) throws IOException, HgDataStreamException {
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589 int lastEntryStart = 2;
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590 int lastColon = -1;
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591 // XXX in fact, need smth like ByteArrayBuilder, similar to StringBuilder,
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592 // which can't be used here because we can't convert bytes to chars as we read them
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593 // (there might be multi-byte encoding), and we need to collect all bytes before converting to string
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594 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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595 String key = null, value = null;
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596 boolean byteOne = false;
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597 for (int i = 2; i < daLength; i++) {
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598 byte b = data.readByte();
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599 if (b == '\n') {
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600 if (byteOne) { // i.e. \n follows 1
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601 lastEntryStart = i+1;
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602 // XXX is it possible to have here incomplete key/value (i.e. if last pair didn't end with \n)
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603 break;
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604 }
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605 if (key == null || lastColon == -1 || i <= lastColon) {
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606 throw new IllegalStateException(); // FIXME log instead and record null key in the metadata. Ex just to fail fast during dev
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607 }
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608 value = new String(bos.toByteArray()).trim();
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609 bos.reset();
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610 _metadata.add(new MetadataEntry(key, value));
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611 key = value = null;
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612 lastColon = -1;
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613 lastEntryStart = i+1;
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614 continue;
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615 }
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616 // byteOne has to be consumed up to this line, if not yet, consume it
157
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617 if (byteOne) {
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618 // insert 1 we've read on previous step into the byte builder
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619 bos.write(1);
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620 byteOne = false;
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621 // fall-through to consume current byte
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622 }
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623 if (b == (int) ':') {
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624 assert value == null;
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625 key = new String(bos.toByteArray());
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626 bos.reset();
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627 lastColon = i;
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628 } else if (b == 1) {
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629 byteOne = true;
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630 } else {
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631 bos.write(b);
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632 }
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633 }
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634 if (data.isEmpty() || !byteOne) {
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635 throw new HgDataStreamException(fname, "Metadata is not closed properly", null);
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636 }
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637 return lastEntryStart;
17
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638 }
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639 }
2
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640 }