Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 520:1ee452f31187

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Experimental support for inverse direction history walking. Refactored/streamlined cancellation in HgLogCommand and down the stack
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 21 Dec 2012 21:20:26 +0100
parents a41d955dc360
children 2f9ed6bcefa2
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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 java.io.File;
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20 import java.io.IOException;
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21 import java.util.ConcurrentModificationException;
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23 import org.tmatesoft.hg.core.Nodeid;
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24 import org.tmatesoft.hg.core.SessionContext;
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25 import org.tmatesoft.hg.internal.ByteArrayChannel;
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26 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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27 import org.tmatesoft.hg.internal.Callback;
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28 import org.tmatesoft.hg.internal.DataAccess;
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29 import org.tmatesoft.hg.internal.DataAccessProvider;
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30 import org.tmatesoft.hg.internal.DigestHelper;
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31 import org.tmatesoft.hg.internal.Experimental;
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32 import org.tmatesoft.hg.internal.InflaterDataAccess;
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33 import org.tmatesoft.hg.internal.Lifecycle;
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34 import org.tmatesoft.hg.internal.Patch;
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35 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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36 import org.tmatesoft.hg.util.Adaptable;
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37 import org.tmatesoft.hg.util.CancelledException;
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38
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39 /**
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40 * WORK IN PROGRESS
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41 *
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42 * @see http://mercurial.selenic.com/wiki/BundleFormat
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43 *
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44 * @author Artem Tikhomirov
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45 * @author TMate Software Ltd.
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46 */
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47 @Experimental(reason="API is not stable")
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48 public class HgBundle {
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49
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50 private final File bundleFile;
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51 private final DataAccessProvider accessProvider;
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52 // private final SessionContext sessionContext;
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53 private Lifecycle.BasicCallback flowControl;
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54
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55 HgBundle(SessionContext ctx, DataAccessProvider dap, File bundle) {
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56 // sessionContext = ctx;
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57 accessProvider = dap;
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58 bundleFile = bundle;
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59 }
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61 private DataAccess getDataStream() throws IOException {
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62 DataAccess da = accessProvider.create(bundleFile);
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63 byte[] signature = new byte[6];
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64 if (da.length() > 6) {
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65 da.readBytes(signature, 0, 6);
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66 if (signature[0] == 'H' && signature[1] == 'G' && signature[2] == '1' && signature[3] == '0') {
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67 if (signature[4] == 'G' && signature[5] == 'Z') {
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68 return new InflaterDataAccess(da, 6, da.length() - 6);
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69 }
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70 if (signature[4] == 'B' && signature[5] == 'Z') {
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71 throw HgRepository.notImplemented();
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72 }
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73 if (signature[4] != 'U' || signature[5] != 'N') {
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74 throw new HgInvalidStateException(String.format("Bad bundle signature: %s", String.valueOf(signature)));
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75 }
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76 // "...UN", fall-through
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77 } else {
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78 da.reset();
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79 }
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80 }
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81 return da;
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82 }
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83
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84 private int uses = 0;
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85 public HgBundle link() {
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86 uses++;
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87 return this;
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88 }
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89 public void unlink() {
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90 uses--;
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91 if (uses == 0 && bundleFile != null) {
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92 bundleFile.deleteOnExit();
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93 }
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94 }
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95 public boolean inUse() {
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96 return uses > 0;
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97 }
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98
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99 /**
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100 * Get changes recorded in the bundle that are missing from the supplied repository.
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101 * @param hgRepo repository that shall possess base revision for this bundle
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102 * @param inspector callback to get each changeset found
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103 */
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104 public void changes(final HgRepository hgRepo, final HgChangelog.Inspector inspector) throws HgRuntimeException {
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105 Inspector bundleInsp = new Inspector() {
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106 DigestHelper dh = new DigestHelper();
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107 boolean emptyChangelog = true;
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108 private DataAccess prevRevContent;
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109 private int revisionIndex;
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111 public void changelogStart() {
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112 emptyChangelog = true;
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113 revisionIndex = 0;
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114 }
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116 public void changelogEnd() {
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117 if (emptyChangelog) {
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118 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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119 }
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120 }
169
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121
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122 /*
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123 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches
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124 * (the previous, or parent patch of a given patch p is the patch that has a node equal to p's p1 field)",
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125 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one
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126 * before is its parent (i.e. ge.firstParent()) or not.
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127 *
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128 Actual state in the changelog.i
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129 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid
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130 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e
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131 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0
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132 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5
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133 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725
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134 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d
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135
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136 Excerpt from bundle (nodeid, p1, p2, cs):
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137 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4
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138 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3
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139 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3
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140 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3
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141 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3
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142
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143 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e
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144 */
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145 public boolean element(GroupElement ge) {
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146 emptyChangelog = false;
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147 HgChangelog changelog = hgRepo.getChangelog();
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148 try {
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149 if (prevRevContent == null) {
274
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150 if (ge.firstParent().isNull() && ge.secondParent().isNull()) {
169
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151 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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152 } else {
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153 final Nodeid base = ge.firstParent();
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154 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) {
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155 throw new IllegalStateException(String.format("Revision %s needs a parent %s, which is missing in the supplied repo %s", ge.node().shortNotation(), base.shortNotation(), hgRepo.toString()));
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156 }
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157 ByteArrayChannel bac = new ByteArrayChannel();
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158 changelog.rawContent(base, bac); // TODO post-1.0 get DataAccess directly, to avoid
169
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159 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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160 prevRevContent = new ByteArrayDataAccess(bac.toArray());
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161 }
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162 }
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163 //
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164 byte[] csetContent = ge.apply(prevRevContent);
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165 dh = dh.sha1(ge.firstParent(), ge.secondParent(), csetContent); // XXX ge may give me access to byte[] content of nodeid directly, perhaps, I don't need DH to be friend of Nodeid?
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166 if (!ge.node().equalsTo(dh.asBinary())) {
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167 throw new HgInvalidStateException(String.format("Integrity check failed on %s, node: %s", bundleFile, ge.node().shortNotation()));
169
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168 }
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169 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent);
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170 RawChangeset cs = RawChangeset.parse(csetDataAccess);
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171 inspector.next(revisionIndex++, ge.node(), cs);
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172 prevRevContent.done();
169
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173 prevRevContent = csetDataAccess.reset();
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174 } catch (CancelledException ex) {
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175 return false;
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176 } catch (IOException ex) {
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177 throw new HgInvalidFileException("Invalid bundle file", ex, bundleFile); // TODO post-1.0 revisit exception handling
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178 } catch (HgInvalidDataFormatException ex) {
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179 throw new HgInvalidControlFileException("Invalid bundle file", ex, bundleFile);
169
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180 }
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181 return true;
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182 }
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183
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184 public void manifestStart() {}
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185 public void manifestEnd() {}
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186 public void fileStart(String name) {}
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187 public void fileEnd(String name) {}
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188
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189 };
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190 inspectChangelog(bundleInsp);
169
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191 }
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192
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193 // callback to minimize amount of Strings and Nodeids instantiated
512
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194 @Callback
169
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195 public interface Inspector {
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196 void changelogStart();
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197
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198 void changelogEnd();
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199
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200 void manifestStart();
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201
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202 void manifestEnd();
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203
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204 void fileStart(String name);
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205
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206 void fileEnd(String name);
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207
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208 /**
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209 * XXX desperately need exceptions here
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210 * @param element data element, instance might be reused, don't keep a reference to it or its raw data
169
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211 * @return <code>true</code> to continue
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212 */
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213 boolean element(GroupElement element);
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214 }
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215
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216 /**
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217 * @param inspector callback to visit changelog entries
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218 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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219 * @throws IllegalArgumentException if inspector argument is null
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220 */
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221 public void inspectChangelog(Inspector inspector) throws HgRuntimeException {
169
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222 if (inspector == null) {
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223 throw new IllegalArgumentException();
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224 }
512
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225 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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226 DataAccess da = null;
169
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227 try {
295
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228 da = getDataStream();
182
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229 internalInspectChangelog(da, inspector);
295
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230 } catch (IOException ex) {
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231 throw new HgInvalidFileException("Bundle.inspectChangelog failed", ex, bundleFile);
37
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232 } finally {
295
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233 if (da != null) {
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234 da.done();
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235 }
512
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236 lifecycleTearDown(lifecycle);
37
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237 }
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238 }
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239
423
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240 /**
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241 * @param inspector callback to visit manifest entries
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242 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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243 * @throws IllegalArgumentException if inspector argument is null
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244 */
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245 public void inspectManifest(Inspector inspector) throws HgRuntimeException {
169
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246 if (inspector == null) {
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247 throw new IllegalArgumentException();
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248 }
512
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249 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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250 DataAccess da = null;
36
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251 try {
295
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252 da = getDataStream();
169
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253 if (da.isEmpty()) {
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254 return;
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255 }
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256 skipGroup(da); // changelog
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257 internalInspectManifest(da, inspector);
295
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258 } catch (IOException ex) {
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259 throw new HgInvalidFileException("Bundle.inspectManifest failed", ex, bundleFile);
36
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260 } finally {
295
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261 if (da != null) {
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262 da.done();
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263 }
512
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264 lifecycleTearDown(lifecycle);
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265 }
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266 }
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267
423
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268 /**
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269 * @param inspector callback to visit file entries
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270 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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271 * @throws IllegalArgumentException if inspector argument is null
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272 */
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273 public void inspectFiles(Inspector inspector) throws HgRuntimeException {
169
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274 if (inspector == null) {
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275 throw new IllegalArgumentException();
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276 }
512
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277 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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278 DataAccess da = null;
169
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279 try {
295
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280 da = getDataStream();
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281 if (da.isEmpty()) {
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282 return;
169
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283 }
182
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284 skipGroup(da); // changelog
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285 if (da.isEmpty()) {
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286 return;
169
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287 }
182
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288 skipGroup(da); // manifest
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289 internalInspectFiles(da, inspector);
295
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290 } catch (IOException ex) {
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291 throw new HgInvalidFileException("Bundle.inspectFiles failed", ex, bundleFile);
169
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292 } finally {
295
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293 if (da != null) {
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294 da.done();
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295 }
512
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296 lifecycleTearDown(lifecycle);
169
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297 }
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298 }
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299
423
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300 /**
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301 * @param inspector visit complete bundle (changelog, manifest and file entries)
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302 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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303 * @throws IllegalArgumentException if inspector argument is null
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304 */
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diff changeset
305 public void inspectAll(Inspector inspector) throws HgRuntimeException {
169
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306 if (inspector == null) {
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307 throw new IllegalArgumentException();
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308 }
512
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309 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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310 DataAccess da = null;
169
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311 try {
295
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312 da = getDataStream();
182
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diff changeset
313 internalInspectChangelog(da, inspector);
513
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diff changeset
314 if (flowControl.isStopped()) {
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diff changeset
315 return;
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diff changeset
316 }
182
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diff changeset
317 internalInspectManifest(da, inspector);
513
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diff changeset
318 if (flowControl.isStopped()) {
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diff changeset
319 return;
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320 }
182
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321 internalInspectFiles(da, inspector);
295
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322 } catch (IOException ex) {
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323 throw new HgInvalidFileException("Bundle.inspectAll failed", ex, bundleFile);
169
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diff changeset
324 } finally {
295
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diff changeset
325 if (da != null) {
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diff changeset
326 da.done();
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diff changeset
327 }
512
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diff changeset
328 lifecycleTearDown(lifecycle);
169
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diff changeset
329 }
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diff changeset
330 }
512
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331
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diff changeset
332 // initialize flowControl, check for concurrent usage, starts lifecyle, if any
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diff changeset
333 // return non-null only if inspector is interested in lifecycle events
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diff changeset
334 private Lifecycle lifecycleSetUp(Inspector inspector) throws ConcurrentModificationException {
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335 // Don't need flowControl in case Inspector doesn't implement Lifecycle,
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336 // however is handy not to expect it == null inside internalInspect*
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337 // XXX Once there's need to make this class thread-safe,
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338 // shall move flowControl to thread-local state.
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339 if (flowControl != null) {
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340 throw new ConcurrentModificationException("HgBundle is in use and not thread-safe yet");
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341 }
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342 flowControl = new Lifecycle.BasicCallback();
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343 final Lifecycle lifecycle = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
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344 if (lifecycle != null) {
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345 lifecycle.start(-1, flowControl, flowControl);
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346 }
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347 return lifecycle;
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348 }
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349
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350 private void lifecycleTearDown(Lifecycle lifecycle) {
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351 if (lifecycle != null) {
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352 lifecycle.finish(flowControl);
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353 }
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354 flowControl = null;
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355 }
169
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356
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357 private void internalInspectChangelog(DataAccess da, Inspector inspector) throws IOException {
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358 if (da.isEmpty()) {
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359 return;
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360 }
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361 inspector.changelogStart();
513
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362 if (flowControl.isStopped()) {
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363 return;
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364 }
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365 readGroup(da, inspector);
513
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366 if (flowControl.isStopped()) {
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367 return;
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368 }
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369 inspector.changelogEnd();
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370 }
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371
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372 private void internalInspectManifest(DataAccess da, Inspector inspector) throws IOException {
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373 if (da.isEmpty()) {
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374 return;
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375 }
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376 inspector.manifestStart();
513
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377 if (flowControl.isStopped()) {
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378 return;
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379 }
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380 readGroup(da, inspector);
513
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381 if (flowControl.isStopped()) {
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382 return;
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383 }
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384 inspector.manifestEnd();
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385 }
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386
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387 private void internalInspectFiles(DataAccess da, Inspector inspector) throws IOException {
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388 while (!da.isEmpty()) {
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389 int fnameLen = da.readInt();
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390 if (fnameLen <= 4) {
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391 break; // null chunk, the last one.
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392 }
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393 byte[] fnameBuf = new byte[fnameLen - 4];
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394 da.readBytes(fnameBuf, 0, fnameBuf.length);
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395 String name = new String(fnameBuf);
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396 inspector.fileStart(name);
513
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397 if (flowControl.isStopped()) {
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398 return;
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399 }
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400 readGroup(da, inspector);
513
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401 if (flowControl.isStopped()) {
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402 return;
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403 }
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404 inspector.fileEnd(name);
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405 }
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406 }
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407
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408 private static void readGroup(DataAccess da, Inspector inspector) throws IOException {
36
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409 int len = da.readInt();
169
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410 boolean good2go = true;
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411 while (len > 4 && !da.isEmpty() && good2go) {
36
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412 byte[] nb = new byte[80];
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413 da.readBytes(nb, 0, 80);
169
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414 int dataLength = len - 84 /* length field + 4 nodeids */;
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415 byte[] data = new byte[dataLength];
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416 da.readBytes(data, 0, dataLength);
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417 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess.
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418 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts),
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419 // regardless whether that slice has read it or not.
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420 GroupElement ge = new GroupElement(nb, slice);
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421 good2go = inspector.element(ge);
170
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diff changeset
422 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array)
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423 /// and we'd better tell it we are not going to use it any more. However, it's important to ensure Inspector
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424 // implementations out there do not retain GroupElement.rawData()
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425 len = da.isEmpty() ? 0 : da.readInt();
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426 }
169
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427 // need to skip up to group end if inspector told he don't want to continue with the group,
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428 // because outer code may try to read next group immediately as we return back.
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429 while (len > 4 && !da.isEmpty()) {
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430 da.skip(len - 4 /* length field */);
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431 len = da.isEmpty() ? 0 : da.readInt();
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432 }
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433 }
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434
169
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435 private static void skipGroup(DataAccess da) throws IOException {
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436 int len = da.readInt();
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437 while (len > 4 && !da.isEmpty()) {
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438 da.skip(len - 4); // sizeof(int)
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439 len = da.isEmpty() ? 0 : da.readInt();
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440 }
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441 }
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442
358
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443 @Experimental(reason="Cumbersome API, rawData and apply with byte[] perhaps need replacement with ByteChannel/ByteBuffer, and better Exceptions. Perhaps, shall split into interface and impl")
169
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444 public static class GroupElement {
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445 private final byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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446 private final DataAccess dataAccess;
329
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diff changeset
447 private Patch patches;
169
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448
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449 GroupElement(byte[] fourNodeids, DataAccess rawDataAccess) {
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450 assert fourNodeids != null && fourNodeids.length == 80;
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451 header = fourNodeids;
169
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diff changeset
452 dataAccess = rawDataAccess;
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453 }
169
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diff changeset
454
358
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diff changeset
455 /**
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456 * <b>node</b> field of the group element
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457 * @return node revision, never <code>null</code>
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458 */
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459 public Nodeid node() {
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460 return Nodeid.fromBinary(header, 0);
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461 }
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462
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463 /**
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464 * <b>p1</b> <i>(parent 1)</i> field of the group element
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465 * @return revision of parent 1, never <code>null</code>
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466 */
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467 public Nodeid firstParent() {
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468 return Nodeid.fromBinary(header, 20);
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469 }
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470
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471 /**
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472 * <b>p2</b> <i>(parent 2)</i> field of the group element
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473 * @return revision of parent 2, never <code>null</code>
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474 */
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475 public Nodeid secondParent() {
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476 return Nodeid.fromBinary(header, 40);
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477 }
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478
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479 /**
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480 * <b>cs</b> <i>(changeset link)</i> field of the group element
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481 * @return changeset revision, never <code>null</code>
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482 */
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483 public Nodeid cset() {
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484 return Nodeid.fromBinary(header, 60);
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485 }
358
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486
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487 public byte[] rawDataByteArray() throws IOException { // XXX IOException or HgInvalidFileException?
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488 return rawData().byteArray();
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489 }
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490
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491 public byte[] apply(byte[] baseContent) throws IOException {
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492 return apply(new ByteArrayDataAccess(baseContent));
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493 }
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494
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495 /*package-local*/ DataAccess rawData() {
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496 return dataAccess;
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497 }
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498
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499 /*package-local*/ Patch patch() throws IOException {
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500 if (patches == null) {
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501 dataAccess.reset();
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502 patches = new Patch();
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503 patches.read(dataAccess);
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504 }
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505 return patches;
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506 }
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507
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508 /*package-local*/ byte[] apply(DataAccess baseContent) throws IOException {
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509 return patch().apply(baseContent, -1);
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510 }
357
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511
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512 public String toString() {
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513 int patchCount;
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514 try {
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515 patchCount = patch().count();
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516 } catch (IOException ex) {
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517 ex.printStackTrace();
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518 patchCount = -1;
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519 }
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520 return String.format("%s %s %s %s; patches:%d\n", node().shortNotation(), firstParent().shortNotation(), secondParent().shortNotation(), cset().shortNotation(), patchCount);
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521 }
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522 }
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523 }