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annotate src/org/tmatesoft/hg/repo/HgDataFile.java @ 305:ae8d116f4ee2

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Experimental code to build file history
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Sep 2011 03:57:38 +0200
parents 650b45d290b1
children 971baa95fb07
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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61
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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
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360 return null;
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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 }
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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 {
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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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431
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432 public Nodeid getCopySourceRevision() throws HgDataStreamException {
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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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437 }
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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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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
88
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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 }