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annotate src/org/tmatesoft/hg/internal/RevlogStream.java @ 84:08754fce5778

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updated design questions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 25 Jan 2011 22:53:28 +0100
parents 4222b04f34ee
children 61eedab3eb3e
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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@svnkit.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.util.ArrayList;
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25 import java.util.Collections;
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26 import java.util.LinkedList;
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27 import java.util.List;
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28 import java.util.zip.DataFormatException;
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29 import java.util.zip.Inflater;
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31 import org.tmatesoft.hg.core.Nodeid;
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32 import org.tmatesoft.hg.repo.HgRepository;
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35 /**
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36 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
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37 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
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38 *
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39 * @see http://mercurial.selenic.com/wiki/Revlog
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40 * @see http://mercurial.selenic.com/wiki/RevlogNG
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class RevlogStream {
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46
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47 private List<IndexEntry> index; // indexed access highly needed
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48 private boolean inline = false;
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49 private final File indexFile;
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50 private final DataAccessProvider dataAccess;
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51
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52 // if we need anything else from HgRepo, might replace DAP parameter with HgRepo and query it for DAP.
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53 public RevlogStream(DataAccessProvider dap, File indexFile) {
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54 this.dataAccess = dap;
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55 this.indexFile = indexFile;
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56 }
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57
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58 /*package*/ DataAccess getIndexStream() {
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59 return dataAccess.create(indexFile);
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60 }
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61
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62 /*package*/ DataAccess getDataStream() {
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63 final String indexName = indexFile.getName();
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64 File dataFile = new File(indexFile.getParentFile(), indexName.substring(0, indexName.length() - 1) + "d");
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65 return dataAccess.create(dataFile);
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66 }
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67
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68 public int revisionCount() {
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69 initOutline();
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70 return index.size();
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71 }
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72
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73 public int dataLength(int revision) {
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74 // XXX in fact, use of iterate() instead of this implementation may be quite reasonable.
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75 //
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76 final int indexSize = revisionCount();
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77 DataAccess daIndex = getIndexStream(); // XXX may supply a hint that I'll need really few bytes of data (although at some offset)
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78 if (revision == TIP) {
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79 revision = indexSize - 1;
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80 }
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81 try {
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82 int recordOffset = inline ? (int) index.get(revision).offset : revision * REVLOGV1_RECORD_SIZE;
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83 daIndex.seek(recordOffset + 12); // 6+2+4
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84 int actualLen = daIndex.readInt();
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85 return actualLen;
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86 } catch (IOException ex) {
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87 ex.printStackTrace(); // log error. FIXME better handling
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88 throw new IllegalStateException(ex);
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89 } finally {
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90 daIndex.done();
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91 }
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92 }
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93
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94 public byte[] nodeid(int revision) {
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95 final int indexSize = revisionCount();
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96 if (revision == TIP) {
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97 revision = indexSize - 1;
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98 }
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99 if (revision < 0 || revision >= indexSize) {
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100 throw new IllegalArgumentException(Integer.toString(revision));
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101 }
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102 DataAccess daIndex = getIndexStream();
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103 try {
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104 int recordOffset = inline ? (int) index.get(revision).offset : revision * REVLOGV1_RECORD_SIZE;
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105 daIndex.seek(recordOffset + 32);
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106 byte[] rv = new byte[20];
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107 daIndex.readBytes(rv, 0, 20);
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108 return rv;
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109 } catch (IOException ex) {
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110 ex.printStackTrace();
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111 throw new IllegalStateException();
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112 } finally {
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113 }
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114 }
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115
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116 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
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117 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
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118 // map of nodeids, and once this comes true, we may get rid of this method.
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119 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
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120 /**
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121 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
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122 */
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123 public int findLocalRevisionNumber(Nodeid nodeid) {
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124 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
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125 final int indexSize = revisionCount();
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126 DataAccess daIndex = getIndexStream();
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127 try {
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128 byte[] nodeidBuf = new byte[20];
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129 for (int i = 0; i < indexSize; i++) {
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130 daIndex.skip(8);
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131 int compressedLen = daIndex.readInt();
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132 daIndex.skip(20);
24
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diff changeset
133 daIndex.readBytes(nodeidBuf, 0, 20);
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134 if (nodeid.equalsTo(nodeidBuf)) {
22
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135 return i;
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diff changeset
136 }
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137 daIndex.skip(inline ? 12 + compressedLen : 12);
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138 }
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139 } catch (IOException ex) {
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140 ex.printStackTrace(); // log error. FIXME better handling
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141 throw new IllegalStateException(ex);
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142 } finally {
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143 daIndex.done();
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144 }
80
4222b04f34ee Follow history of a file
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145 return BAD_REVISION;
22
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146 }
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147
2
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148
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149 private final int REVLOGV1_RECORD_SIZE = 64;
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150
3
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151 // should be possible to use TIP, ALL, or -1, -2, -n notation of Hg
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152 // ? boolean needsNodeid
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153 public void iterate(int start, int end, boolean needData, Inspector inspector) {
2
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154 initOutline();
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155 final int indexSize = index.size();
3
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156 if (indexSize == 0) {
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157 return;
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158 }
5
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159 if (end == TIP) {
3
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160 end = indexSize - 1;
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161 }
5
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162 if (start == TIP) {
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163 start = indexSize - 1;
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164 }
2
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165 if (start < 0 || start >= indexSize) {
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166 throw new IllegalArgumentException("Bad left range boundary " + start);
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167 }
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168 if (end < start || end >= indexSize) {
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169 throw new IllegalArgumentException("Bad right range boundary " + end);
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170 }
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171 // XXX may cache [start .. end] from index with a single read (pre-read)
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172
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173 DataAccess daIndex = null, daData = null;
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174 daIndex = getIndexStream();
3
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175 if (needData && !inline) {
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176 daData = getDataStream();
2
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177 }
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178 try {
24
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179 byte[] nodeidBuf = new byte[20];
3
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180 byte[] lastData = null;
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181 int i;
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182 boolean extraReadsToBaseRev = false;
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183 if (needData && index.get(start).baseRevision < start) {
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184 i = index.get(start).baseRevision;
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185 extraReadsToBaseRev = true;
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186 } else {
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187 i = start;
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188 }
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189
22
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190 daIndex.seek(inline ? (int) index.get(i).offset : i * REVLOGV1_RECORD_SIZE);
5
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191 for (; i <= end; i++ ) {
9
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192 long l = daIndex.readLong();
49
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diff changeset
193 @SuppressWarnings("unused")
2
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194 long offset = l >>> 16;
49
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195 @SuppressWarnings("unused")
2
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diff changeset
196 int flags = (int) (l & 0X0FFFF);
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197 int compressedLen = daIndex.readInt();
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198 int actualLen = daIndex.readInt();
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199 int baseRevision = daIndex.readInt();
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200 int linkRevision = daIndex.readInt();
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201 int parent1Revision = daIndex.readInt();
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202 int parent2Revision = daIndex.readInt();
24
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diff changeset
203 // Hg has 32 bytes here, uses 20 for nodeid, and keeps 12 last bytes empty
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diff changeset
204 daIndex.readBytes(nodeidBuf, 0, 20);
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diff changeset
205 daIndex.skip(12);
2
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diff changeset
206 byte[] data = null;
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diff changeset
207 if (needData) {
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diff changeset
208 byte[] dataBuf = new byte[compressedLen];
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diff changeset
209 if (inline) {
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diff changeset
210 daIndex.readBytes(dataBuf, 0, compressedLen);
2
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diff changeset
211 } else {
9
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diff changeset
212 daData.seek(index.get(i).offset);
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diff changeset
213 daData.readBytes(dataBuf, 0, compressedLen);
2
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diff changeset
214 }
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diff changeset
215 if (dataBuf[0] == 0x78 /* 'x' */) {
3
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diff changeset
216 try {
33
565ce0835674 TODO added, to try stream for unzip in revlog
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diff changeset
217 Inflater zlib = new Inflater(); // XXX Consider reuse of Inflater, and/or stream alternative
3
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diff changeset
218 zlib.setInput(dataBuf, 0, compressedLen);
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diff changeset
219 byte[] result = new byte[actualLen*2]; // FIXME need to use zlib.finished() instead
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diff changeset
220 int resultLen = zlib.inflate(result);
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diff changeset
221 zlib.end();
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diff changeset
222 data = new byte[resultLen];
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diff changeset
223 System.arraycopy(result, 0, data, 0, resultLen);
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diff changeset
224 } catch (DataFormatException ex) {
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diff changeset
225 ex.printStackTrace();
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diff changeset
226 data = new byte[0]; // FIXME need better failure strategy
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diff changeset
227 }
2
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diff changeset
228 } else if (dataBuf[0] == 0x75 /* 'u' */) {
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diff changeset
229 data = new byte[dataBuf.length - 1];
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diff changeset
230 System.arraycopy(dataBuf, 1, data, 0, data.length);
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diff changeset
231 } else {
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diff changeset
232 // XXX Python impl in fact throws exception when there's not 'x', 'u' or '0'
3
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diff changeset
233 // but I don't see reason not to return data as is
2
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diff changeset
234 data = dataBuf;
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235 }
3
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diff changeset
236 // XXX
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diff changeset
237 if (baseRevision != i) { // XXX not sure if this is the right way to detect a patch
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diff changeset
238 // this is a patch
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diff changeset
239 LinkedList<PatchRecord> patches = new LinkedList<PatchRecord>();
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diff changeset
240 int patchElementIndex = 0;
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diff changeset
241 do {
36
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
242 PatchRecord pr = PatchRecord.read(data, patchElementIndex);
205f9b59b400 Strip parsing logic out from console frontend
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diff changeset
243 patches.add(pr);
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diff changeset
244 patchElementIndex += 12 + pr.len;
3
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diff changeset
245 } while (patchElementIndex < data.length);
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diff changeset
246 //
5
fc265ddeab26 File content and non-effective, although working, patch application
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diff changeset
247 byte[] baseRevContent = lastData;
6
5abe5af181bd Ant script to build commands and run sample
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diff changeset
248 data = apply(baseRevContent, actualLen, patches);
3
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diff changeset
249 }
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250 } else {
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diff changeset
251 if (inline) {
9
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diff changeset
252 daIndex.skip(compressedLen);
3
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diff changeset
253 }
2
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254 }
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255 if (!extraReadsToBaseRev || i >= start) {
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256 inspector.next(i, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeidBuf, data);
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257 }
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258 lastData = data;
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259 }
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260 } catch (IOException ex) {
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261 throw new IllegalStateException(ex); // FIXME need better handling
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262 } finally {
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263 daIndex.done();
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264 if (daData != null) {
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265 daData.done();
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266 }
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267 }
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268 }
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269
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270 private void initOutline() {
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271 if (index != null && !index.isEmpty()) {
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272 return;
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273 }
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274 ArrayList<IndexEntry> res = new ArrayList<IndexEntry>();
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275 DataAccess da = getIndexStream();
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276 try {
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277 int versionField = da.readInt();
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278 da.readInt(); // just to skip next 2 bytes of offset + flags
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279 final int INLINEDATA = 1 << 16;
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280 inline = (versionField & INLINEDATA) != 0;
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281 long offset = 0; // first offset is always 0, thus Hg uses it for other purposes
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282 while(true) {
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283 int compressedLen = da.readInt();
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284 // 8+4 = 12 bytes total read here
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285 @SuppressWarnings("unused")
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286 int actualLen = da.readInt();
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287 int baseRevision = da.readInt();
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288 // 12 + 8 = 20 bytes read here
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289 // int linkRevision = di.readInt();
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290 // int parent1Revision = di.readInt();
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291 // int parent2Revision = di.readInt();
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292 // byte[] nodeid = new byte[32];
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293 if (inline) {
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294 res.add(new IndexEntry(offset + REVLOGV1_RECORD_SIZE * res.size(), baseRevision));
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295 da.skip(3*4 + 32 + compressedLen); // Check: 44 (skip) + 20 (read) = 64 (total RevlogNG record size)
2
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296 } else {
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297 res.add(new IndexEntry(offset, baseRevision));
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298 da.skip(3*4 + 32);
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299 }
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300 if (da.isEmpty()) {
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301 // fine, done then
22
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302 res.trimToSize();
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303 index = res;
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304 break;
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305 } else {
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306 // start reading next record
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307 long l = da.readLong();
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308 offset = l >>> 16;
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309 }
2
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310 }
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311 } catch (IOException ex) {
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312 ex.printStackTrace(); // log error
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313 // too bad, no outline then.
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314 index = Collections.emptyList();
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315 } finally {
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316 da.done();
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317 }
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318
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319 }
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320
2
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321
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322 // perhaps, package-local or protected, if anyone else from low-level needs them
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323 // XXX think over if we should keep offset in case of separate data file - we read the field anyway. Perhaps, distinct entry classes for Inline and non-inline indexes?
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324 private static class IndexEntry {
4
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325 public final long offset; // for separate .i and .d - copy of index record entry, for inline index - actual offset of the record in the .i file (record entry + revision * record size))
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326 //public final int length; // data past fixed record (need to decide whether including header size or not), and whether length is of compressed data or not
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327 public final int baseRevision;
2
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328
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329 public IndexEntry(long o, int baseRev) {
2
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330 offset = o;
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331 baseRevision = baseRev;
2
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332 }
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333 }
3
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334
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335 // mpatch.c : apply()
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336 // FIXME need to implement patch merge (fold, combine, gather and discard from aforementioned mpatch.[c|py]), also see Revlog and Mercurial PDF
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337 public/*for HgBundle; until moved to better place*/static byte[] apply(byte[] baseRevisionContent, int outcomeLen, List<PatchRecord> patch) {
3
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diff changeset
338 int last = 0, destIndex = 0;
43
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diff changeset
339 if (outcomeLen == -1) {
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diff changeset
340 outcomeLen = baseRevisionContent.length;
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341 for (PatchRecord pr : patch) {
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diff changeset
342 outcomeLen += pr.start - last + pr.len;
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343 last = pr.end;
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344 }
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345 outcomeLen -= last;
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346 last = 0;
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347 }
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diff changeset
348 byte[] rv = new byte[outcomeLen];
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349 for (PatchRecord pr : patch) {
43
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diff changeset
350 System.arraycopy(baseRevisionContent, last, rv, destIndex, pr.start-last);
3
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351 destIndex += pr.start - last;
43
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352 System.arraycopy(pr.data, 0, rv, destIndex, pr.data.length);
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353 destIndex += pr.data.length;
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354 last = pr.end;
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355 }
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356 System.arraycopy(baseRevisionContent, last, rv, destIndex, baseRevisionContent.length - last);
3
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357 return rv;
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358 }
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359
35
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diff changeset
360 // @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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diff changeset
361 public static class PatchRecord {
52
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362 /*
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363 Given there are pr1 and pr2:
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364 pr1.start to pr1.end will be replaced with pr's data (of pr1.len)
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365 pr1.end to pr2.start gets copied from base
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366 */
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367 public int start, end, len;
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368 public byte[] data;
3
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diff changeset
369
36
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370 // TODO consider PatchRecord that only records data position (absolute in data source), and acquires data as needed
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diff changeset
371 private PatchRecord(int p1, int p2, int length, byte[] src) {
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diff changeset
372 start = p1;
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373 end = p2;
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374 len = length;
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375 data = src;
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376 }
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377
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378 /*package-local*/ static PatchRecord read(byte[] data, int offset) {
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379 final int x = offset; // shorthand
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380 int p1 = ((data[x] & 0xFF)<< 24) | ((data[x+1] & 0xFF) << 16) | ((data[x+2] & 0xFF) << 8) | (data[x+3] & 0xFF);
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381 int p2 = ((data[x+4] & 0xFF) << 24) | ((data[x+5] & 0xFF) << 16) | ((data[x+6] & 0xFF) << 8) | (data[x+7] & 0xFF);
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382 int len = ((data[x+8] & 0xFF) << 24) | ((data[x+9] & 0xFF) << 16) | ((data[x+10] & 0xFF) << 8) | (data[x+11] & 0xFF);
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383 byte[] dataCopy = new byte[len];
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384 System.arraycopy(data, x+12, dataCopy, 0, len);
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385 return new PatchRecord(p1, p2, len, dataCopy);
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386 }
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387
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388 public /*for HgBundle*/ static PatchRecord read(DataAccess da) throws IOException {
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389 int p1 = da.readInt();
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390 int p2 = da.readInt();
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391 int len = da.readInt();
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392 byte[] src = new byte[len];
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393 da.readBytes(src, 0, len);
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394 return new PatchRecord(p1, p2, len, src);
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395 }
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396 }
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397
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398 // FIXME byte[] data might be too expensive, for few usecases it may be better to have intermediate Access object (when we don't need full data
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399 // instantly - e.g. calculate hash, or comparing two revisions
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400 public interface Inspector {
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401 // XXX boolean retVal to indicate whether to continue?
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402 // TODO specify nodeid and data length, and reuse policy (i.e. if revlog stream doesn't reuse nodeid[] for each call)
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403 void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[/*20*/] nodeid, byte[] data);
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404 }
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405 }