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annotate src/org/tmatesoft/hg/internal/RevlogStreamWriter.java @ 660:4fd317a2fecf

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Pull: phase1 get remote changes and add local revisions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 09 Jul 2013 21:46:45 +0200
parents 14dac192aa26
children 46b56864b483
rev   line source
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1 /*
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2 * Copyright (c) 2013 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.internal;
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19 import static org.tmatesoft.hg.internal.Internals.REVLOGV1_RECORD_SIZE;
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20 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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21
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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24
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25 import org.tmatesoft.hg.core.HgIOException;
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26 import org.tmatesoft.hg.core.Nodeid;
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27 import org.tmatesoft.hg.core.SessionContext;
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28 import org.tmatesoft.hg.internal.DataSerializer.ByteArrayDataSource;
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29 import org.tmatesoft.hg.internal.DataSerializer.ByteArraySerializer;
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30 import org.tmatesoft.hg.internal.DataSerializer.DataSource;
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31 import org.tmatesoft.hg.repo.HgBundle.GroupElement;
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32 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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33 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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34 import org.tmatesoft.hg.repo.HgInvalidStateException;
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35 import org.tmatesoft.hg.repo.HgRepository;
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36 import org.tmatesoft.hg.repo.HgRuntimeException;
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37 import org.tmatesoft.hg.util.Pair;
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38
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39 /**
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40 *
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41 * TODO [post-1.1] separate operation to check if index is too big and split into index+data
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class RevlogStreamWriter {
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47
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48 private final DigestHelper dh = new DigestHelper();
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49 private final RevlogCompressor revlogDataZip;
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50 private final Transaction transaction;
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51 private int lastEntryBase, lastEntryIndex, lastEntryActualLen;
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52 // record revision and its full content
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53 // the name might be misleading, it does not necessarily match lastEntryIndex
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54 private Pair<Integer, byte[]> lastFullContent;
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55 private Nodeid lastEntryRevision;
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56 private IntMap<Nodeid> revisionCache = new IntMap<Nodeid>(32);
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57 private RevlogStream revlogStream;
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58
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59 public RevlogStreamWriter(SessionContext.Source ctxSource, RevlogStream stream, Transaction tr) {
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60 assert ctxSource != null;
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61 assert stream != null;
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62 assert tr != null;
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63
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64 revlogDataZip = new RevlogCompressor(ctxSource.getSessionContext());
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65 revlogStream = stream;
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66 transaction = tr;
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67 }
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68
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69 public Pair<Integer,Nodeid> addPatchRevision(GroupElement ge, RevisionToIndexMap clogRevs, RevisionToIndexMap revlogRevs) throws HgIOException, HgRuntimeException {
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70 populateLastEntryIndex();
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71 //
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72 final Nodeid nodeRev = ge.node();
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73 final Nodeid csetRev = ge.cset();
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74 int linkRev;
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75 if (nodeRev.equals(csetRev)) {
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76 linkRev = lastEntryIndex+1;
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77 } else {
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78 linkRev = clogRevs.revisionIndex(csetRev);
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79 }
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80 assert linkRev >= 0;
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81 final Nodeid p1Rev = ge.firstParent();
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82 int p1 = p1Rev.isNull() ? NO_REVISION : revlogRevs.revisionIndex(p1Rev);
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83 final Nodeid p2Rev = ge.secondParent();
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84 int p2 = p2Rev.isNull() ? NO_REVISION : revlogRevs.revisionIndex(p2Rev);
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85 Patch p = new Patch();
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86 final byte[] patchBytes;
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87 try {
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88 // XXX there's ge.rawData(), to avoid extra array wrap
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89 patchBytes = ge.rawDataByteArray();
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90 p.read(new ByteArrayDataAccess(patchBytes));
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91 } catch (IOException ex) {
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92 throw new HgIOException("Failed to read patch information", ex, null);
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93 }
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94 //
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95 final Nodeid patchBase = ge.patchBase();
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96 int patchBaseRev = patchBase.isNull() ? NO_REVISION : revlogRevs.revisionIndex(patchBase);
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97 int baseRev = lastEntryIndex == NO_REVISION ? 0 : revlogStream.baseRevision(patchBaseRev);
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98 int revLen;
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99 DataSource ds;
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100 byte[] complete = null;
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101 if (patchBaseRev == lastEntryIndex && lastEntryIndex != NO_REVISION) {
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102 // we may write patch from GroupElement as is
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103 int patchBaseLen = dataLength(patchBaseRev);
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104 revLen = patchBaseLen + p.patchSizeDelta();
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105 ds = new ByteArrayDataSource(patchBytes);
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106 } else {
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107 // read baseRev, unless it's the pull to empty repository
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108 try {
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109 if (lastEntryIndex == NO_REVISION) {
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110 complete = p.apply(new ByteArrayDataAccess(new byte[0]), -1);
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111 baseRev = 0; // it's done above, but doesn't hurt
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112 } else {
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113 ReadContentInspector insp = new ReadContentInspector().read(revlogStream, baseRev);
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114 complete = p.apply(new ByteArrayDataAccess(insp.content), -1);
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115 baseRev = lastEntryIndex + 1;
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116 }
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117 ds = new ByteArrayDataSource(complete);
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118 revLen = complete.length;
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119 } catch (IOException ex) {
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120 // unlikely to happen, as ByteArrayDataSource doesn't throw IOException
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121 throw new HgIOException("Failed to reconstruct revision", ex, null);
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122 }
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123 }
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124 doAdd(nodeRev, p1, p2, linkRev, baseRev, revLen, ds);
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125 if (complete != null) {
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126 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, complete);
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127 }
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128 return new Pair<Integer, Nodeid>(lastEntryIndex, lastEntryRevision);
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129 }
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130
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131 /**
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132 * @return nodeid of added revision
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133 * @throws HgRuntimeException
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134 */
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135 public Pair<Integer,Nodeid> addRevision(DataSource content, int linkRevision, int p1, int p2) throws HgIOException, HgRuntimeException {
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136 populateLastEntryIndex();
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137 populateLastEntryContent();
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138 //
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139 byte[] contentByteArray = toByteArray(content);
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140 Patch patch = GeneratePatchInspector.delta(lastFullContent.second(), contentByteArray);
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141 int patchSerializedLength = patch.serializedLength();
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142
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143 final boolean writeComplete = preferCompleteOverPatch(patchSerializedLength, contentByteArray.length);
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144 DataSerializer.DataSource dataSource = writeComplete ? new ByteArrayDataSource(contentByteArray) : patch.new PatchDataSource();
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145 //
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146 Nodeid p1Rev = revision(p1);
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147 Nodeid p2Rev = revision(p2);
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148 Nodeid newRev = Nodeid.fromBinary(dh.sha1(p1Rev, p2Rev, contentByteArray).asBinary(), 0);
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149 doAdd(newRev, p1, p2, linkRevision, writeComplete ? lastEntryIndex+1 : lastEntryBase, contentByteArray.length, dataSource);
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150 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, contentByteArray);
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151 return new Pair<Integer, Nodeid>(lastEntryIndex, lastEntryRevision);
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152 }
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153
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154 private Nodeid doAdd(Nodeid rev, int p1, int p2, int linkRevision, int baseRevision, int revLen, DataSerializer.DataSource dataSource) throws HgIOException, HgRuntimeException {
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155 assert linkRevision >= 0;
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156 assert baseRevision >= 0;
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157 assert p1 == NO_REVISION || p1 >= 0;
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158 assert p2 == NO_REVISION || p2 >= 0;
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159 assert !rev.isNull();
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160 assert revLen >= 0;
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161 revlogDataZip.reset(dataSource);
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162 final int compressedLen;
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163 final boolean useCompressedData = preferCompressedOverComplete(revlogDataZip.getCompressedLength(), dataSource.serializeLength());
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164 if (useCompressedData) {
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165 compressedLen= revlogDataZip.getCompressedLength();
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166 } else {
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167 // compression wasn't too effective,
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168 compressedLen = dataSource.serializeLength() + 1 /*1 byte for 'u' - uncompressed prefix byte*/;
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169 }
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170 //
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171 DataSerializer indexFile, dataFile;
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172 indexFile = dataFile = null;
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173 try {
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174 //
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175 indexFile = revlogStream.getIndexStreamWriter(transaction);
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176 final boolean isInlineData = revlogStream.isInlineData();
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177 HeaderWriter revlogHeader = new HeaderWriter(isInlineData);
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178 revlogHeader.length(revLen, compressedLen);
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179 revlogHeader.nodeid(rev.toByteArray());
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180 revlogHeader.linkRevision(linkRevision);
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181 revlogHeader.parents(p1, p2);
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182 revlogHeader.baseRevision(baseRevision);
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183 long lastEntryOffset = revlogStream.newEntryOffset();
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184 revlogHeader.offset(lastEntryOffset);
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185 //
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186 revlogHeader.serialize(indexFile);
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187
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188 if (isInlineData) {
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189 dataFile = indexFile;
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190 } else {
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191 dataFile = revlogStream.getDataStreamWriter(transaction);
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192 }
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193 if (useCompressedData) {
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194 int actualCompressedLenWritten = revlogDataZip.writeCompressedData(dataFile);
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195 if (actualCompressedLenWritten != compressedLen) {
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196 throw new HgInvalidStateException(String.format("Expected %d bytes of compressed data, but actually wrote %d in %s", compressedLen, actualCompressedLenWritten, revlogStream.getDataFileName()));
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197 }
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198 } else {
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199 dataFile.writeByte((byte) 'u');
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200 dataSource.serialize(dataFile);
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201 }
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202
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203 lastEntryBase = revlogHeader.baseRevision();
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204 lastEntryIndex++;
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205 lastEntryActualLen = revLen;
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206 lastEntryRevision = rev;
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207 revisionCache.put(lastEntryIndex, lastEntryRevision);
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208
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209 revlogStream.revisionAdded(lastEntryIndex, lastEntryRevision, lastEntryBase, lastEntryOffset);
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210 } finally {
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211 indexFile.done();
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212 if (dataFile != null && dataFile != indexFile) {
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213 dataFile.done();
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214 }
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215 }
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216 return lastEntryRevision;
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217 }
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218
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219 private byte[] toByteArray(DataSource content) throws HgIOException, HgRuntimeException {
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220 ByteArraySerializer ba = new ByteArraySerializer();
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221 content.serialize(ba);
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222 return ba.toByteArray();
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223 }
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224
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225 private Nodeid revision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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226 if (revisionIndex == NO_REVISION) {
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227 return Nodeid.NULL;
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228 }
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229 Nodeid n = revisionCache.get(revisionIndex);
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230 if (n == null) {
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231 n = Nodeid.fromBinary(revlogStream.nodeid(revisionIndex), 0);
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232 revisionCache.put(revisionIndex, n);
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233 }
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234 return n;
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235 }
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236
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237 private int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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238 assert revisionIndex >= 0;
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239 if (revisionIndex == lastEntryIndex) {
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240 return lastEntryActualLen;
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241 }
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242 if (lastFullContent != null && lastFullContent.first() == revisionIndex) {
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243 return lastFullContent.second().length;
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244 }
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245 return revlogStream.dataLength(revisionIndex);
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246 }
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247
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248 private void populateLastEntryIndex() throws HgRuntimeException {
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249 int revCount = revlogStream.revisionCount();
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250 lastEntryIndex = revCount == 0 ? NO_REVISION : revCount - 1;
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251 }
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252
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253 private void populateLastEntryContent() throws HgRuntimeException {
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254 if (lastFullContent != null && lastFullContent.first() == lastEntryIndex) {
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255 // we have last entry cached
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256 return;
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257 }
660
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258 lastEntryRevision = Nodeid.NULL;
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259 if (lastEntryIndex != NO_REVISION) {
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260 ReadContentInspector insp = new ReadContentInspector().read(revlogStream, lastEntryIndex);
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261 lastEntryBase = insp.baseRev;
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262 lastEntryRevision = insp.rev;
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263 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, insp.content);
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264 } else {
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265 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, new byte[0]);
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266 }
660
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267 assert lastFullContent.first() == lastEntryIndex;
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268 assert lastFullContent.second() != null;
538
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269 }
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270
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271 public static boolean preferCompleteOverPatch(int patchLength, int fullContentLength) {
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272 return !decideWorthEffort(patchLength, fullContentLength);
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273 }
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274
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275 public static boolean preferCompressedOverComplete(int compressedLen, int fullContentLength) {
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276 if (compressedLen <= 0) { // just in case, meaningless otherwise
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277 return false;
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278 }
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279 return decideWorthEffort(compressedLen, fullContentLength);
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280 }
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281
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282 // true if length obtained with effort is worth it
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283 private static boolean decideWorthEffort(int lengthWithExtraEffort, int lengthWithoutEffort) {
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284 return lengthWithExtraEffort < (/* 3/4 of original */lengthWithoutEffort - (lengthWithoutEffort >>> 2));
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285 }
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286
534
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287 /*XXX public because HgCloneCommand uses it*/
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288 public static class HeaderWriter implements DataSerializer.DataSource {
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289 private final ByteBuffer header;
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290 private final boolean isInline;
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291 private long offset;
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292 private int length, compressedLength;
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293 private int baseRev, linkRev, p1, p2;
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294 private byte[] nodeid;
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295
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296 public HeaderWriter(boolean inline) {
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297 isInline = inline;
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298 header = ByteBuffer.allocate(REVLOGV1_RECORD_SIZE);
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299 }
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300
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301 public HeaderWriter offset(long offset) {
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302 this.offset = offset;
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303 return this;
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304 }
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305
532
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306 public int baseRevision() {
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307 return baseRev;
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308 }
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309
530
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310 public HeaderWriter baseRevision(int baseRevision) {
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311 this.baseRev = baseRevision;
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312 return this;
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313 }
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314
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315 public HeaderWriter length(int len, int compressedLen) {
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316 this.length = len;
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317 this.compressedLength = compressedLen;
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318 return this;
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319 }
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320
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321 public HeaderWriter parents(int parent1, int parent2) {
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322 p1 = parent1;
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323 p2 = parent2;
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324 return this;
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325 }
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326
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327 public HeaderWriter linkRevision(int linkRevision) {
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328 linkRev = linkRevision;
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329 return this;
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330 }
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331
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332 public HeaderWriter nodeid(Nodeid n) {
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333 nodeid = n.toByteArray();
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334 return this;
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335 }
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336
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337 public HeaderWriter nodeid(byte[] nodeidBytes) {
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338 nodeid = nodeidBytes;
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339 return this;
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340 }
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341
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342 public void serialize(DataSerializer out) throws HgIOException {
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343 header.clear();
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344 if (offset == 0) {
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345 int version = 1 /* RevlogNG */;
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346 if (isInline) {
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347 version |= RevlogStream.INLINEDATA;
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348 }
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349 header.putInt(version);
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350 header.putInt(0);
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351 } else {
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352 header.putLong(offset << 16);
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353 }
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354 header.putInt(compressedLength);
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355 header.putInt(length);
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356 header.putInt(baseRev);
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357 header.putInt(linkRev);
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358 header.putInt(p1);
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359 header.putInt(p2);
534
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360 header.put(nodeid);
530
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361 // assume 12 bytes left are zeros
534
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362 out.write(header.array(), 0, header.capacity());
530
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363
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364 // regardless whether it's inline or separate data,
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365 // offset field always represent cumulative compressedLength
539
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366 // (while physical offset in the index file with inline==true differs by n*sizeof(header), where n is entry's position in the file)
530
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367 offset += compressedLength;
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368 }
534
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369
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370 public int serializeLength() {
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371 return header.capacity();
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372 }
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373 }
660
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374
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375 // XXX part of HgRevisionMap contract, need public counterparts (along with IndexToRevisionMap)
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376 public interface RevisionToIndexMap {
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377
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378 /**
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379 * @return {@link HgRepository#NO_REVISION} if unknown revision
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380 */
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381 int revisionIndex(Nodeid revision);
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382 }
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383
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384 private static class ReadContentInspector implements RevlogStream.Inspector {
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385 public int baseRev;
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386 public Nodeid rev;
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387 public byte[] content;
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388 private IOException failure;
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389
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390 public ReadContentInspector read(RevlogStream rs, int revIndex) throws HgInvalidControlFileException {
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391 assert revIndex >= 0;
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392 rs.iterate(revIndex, revIndex, true, this);
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393 if (failure != null) {
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394 String m = String.format("Failed to get content of revision %d", revIndex);
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395 throw rs.initWithDataFile(new HgInvalidControlFileException(m, failure, null));
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396 }
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397 return this;
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398 }
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399
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400 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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401 try {
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402 baseRev = baseRevision;
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403 rev = Nodeid.fromBinary(nodeid, 0);
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404 content = data.byteArray();
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405 } catch (IOException ex) {
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406 failure = ex;
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407 }
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408 }
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409 }
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410 }