Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 527:47b7bedf0569

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Tests for present HgCheckoutCommand functionality. Update branch information on checkout. Use UTF8 encoding for the branch file
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Jan 2013 19:46:19 +0100
parents 2f9ed6bcefa2
children 688c1ab113bb
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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22
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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.Internals;
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34 import org.tmatesoft.hg.internal.Lifecycle;
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35 import org.tmatesoft.hg.internal.Patch;
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36 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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37 import org.tmatesoft.hg.util.Adaptable;
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38 import org.tmatesoft.hg.util.CancelledException;
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39
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40 /**
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41 * WORK IN PROGRESS
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42 *
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43 * @see http://mercurial.selenic.com/wiki/BundleFormat
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44 *
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45 * @author Artem Tikhomirov
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46 * @author TMate Software Ltd.
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47 */
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48 @Experimental(reason="API is not stable")
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49 public class HgBundle {
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50
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51 private final File bundleFile;
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52 private final DataAccessProvider accessProvider;
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53 // private final SessionContext sessionContext;
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54 private Lifecycle.BasicCallback flowControl;
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55
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56 HgBundle(SessionContext ctx, DataAccessProvider dap, File bundle) {
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57 // sessionContext = ctx;
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58 accessProvider = dap;
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59 bundleFile = bundle;
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60 }
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61
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62 private DataAccess getDataStream() throws IOException {
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63 DataAccess da = accessProvider.create(bundleFile);
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64 byte[] signature = new byte[6];
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65 if (da.length() > 6) {
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66 da.readBytes(signature, 0, 6);
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67 if (signature[0] == 'H' && signature[1] == 'G' && signature[2] == '1' && signature[3] == '0') {
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68 if (signature[4] == 'G' && signature[5] == 'Z') {
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69 return new InflaterDataAccess(da, 6, da.length() - 6);
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70 }
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71 if (signature[4] == 'B' && signature[5] == 'Z') {
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72 throw Internals.notImplemented();
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73 }
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74 if (signature[4] != 'U' || signature[5] != 'N') {
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75 throw new HgInvalidStateException(String.format("Bad bundle signature: %s", String.valueOf(signature)));
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76 }
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77 // "...UN", fall-through
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78 } else {
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79 da.reset();
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80 }
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81 }
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82 return da;
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83 }
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84
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85 private int uses = 0;
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86 public HgBundle link() {
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87 uses++;
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88 return this;
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89 }
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90 public void unlink() {
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91 uses--;
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92 if (uses == 0 && bundleFile != null) {
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93 bundleFile.deleteOnExit();
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94 }
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95 }
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96 public boolean inUse() {
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97 return uses > 0;
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98 }
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99
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100 /**
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101 * Get changes recorded in the bundle that are missing from the supplied repository.
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102 * @param hgRepo repository that shall possess base revision for this bundle
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103 * @param inspector callback to get each changeset found
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104 */
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105 public void changes(final HgRepository hgRepo, final HgChangelog.Inspector inspector) throws HgRuntimeException {
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106 Inspector bundleInsp = new Inspector() {
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107 DigestHelper dh = new DigestHelper();
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108 boolean emptyChangelog = true;
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109 private DataAccess prevRevContent;
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110 private int revisionIndex;
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112 public void changelogStart() {
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113 emptyChangelog = true;
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114 revisionIndex = 0;
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115 }
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116
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117 public void changelogEnd() {
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118 if (emptyChangelog) {
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119 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
42
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120 }
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121 }
169
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122
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123 /*
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124 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches
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125 * (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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126 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one
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127 * before is its parent (i.e. ge.firstParent()) or not.
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128 *
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129 Actual state in the changelog.i
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130 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid
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131 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e
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132 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0
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133 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5
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134 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725
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135 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d
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136
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137 Excerpt from bundle (nodeid, p1, p2, cs):
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138 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4
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139 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3
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140 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3
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141 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3
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142 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3
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143
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144 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e
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145 */
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146 public boolean element(GroupElement ge) {
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147 emptyChangelog = false;
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148 HgChangelog changelog = hgRepo.getChangelog();
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149 try {
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150 if (prevRevContent == null) {
274
9fb50c04f03c Use Nodeid.isNull check instead of NULL.equals
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151 if (ge.firstParent().isNull() && ge.secondParent().isNull()) {
169
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152 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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153 } else {
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154 final Nodeid base = ge.firstParent();
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155 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) {
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156 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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157 }
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158 ByteArrayChannel bac = new ByteArrayChannel();
418
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159 changelog.rawContent(base, bac); // TODO post-1.0 get DataAccess directly, to avoid
169
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160 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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161 prevRevContent = new ByteArrayDataAccess(bac.toArray());
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162 }
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163 }
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164 //
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165 byte[] csetContent = ge.apply(prevRevContent);
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166 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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167 if (!ge.node().equalsTo(dh.asBinary())) {
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168 throw new HgInvalidStateException(String.format("Integrity check failed on %s, node: %s", bundleFile, ge.node().shortNotation()));
169
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169 }
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170 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent);
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171 RawChangeset cs = RawChangeset.parse(csetDataAccess);
182
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172 inspector.next(revisionIndex++, ge.node(), cs);
170
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173 prevRevContent.done();
169
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174 prevRevContent = csetDataAccess.reset();
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175 } catch (CancelledException ex) {
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176 return false;
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177 } catch (IOException ex) {
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178 throw new HgInvalidFileException("Invalid bundle file", ex, bundleFile); // TODO post-1.0 revisit exception handling
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179 } catch (HgInvalidDataFormatException ex) {
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180 throw new HgInvalidControlFileException("Invalid bundle file", ex, bundleFile);
169
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181 }
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182 return true;
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183 }
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184
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185 public void manifestStart() {}
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186 public void manifestEnd() {}
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187 public void fileStart(String name) {}
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188 public void fileEnd(String name) {}
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189
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190 };
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191 inspectChangelog(bundleInsp);
169
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192 }
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193
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194 // callback to minimize amount of Strings and Nodeids instantiated
512
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195 @Callback
169
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196 public interface Inspector {
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197 void changelogStart();
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198
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199 void changelogEnd();
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200
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201 void manifestStart();
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202
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203 void manifestEnd();
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204
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205 void fileStart(String name);
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206
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207 void fileEnd(String name);
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208
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209 /**
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210 * XXX desperately need exceptions here
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211 * @param element data element, instance might be reused, don't keep a reference to it or its raw data
169
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212 * @return <code>true</code> to continue
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213 */
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214 boolean element(GroupElement element);
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215 }
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216
423
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217 /**
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218 * @param inspector callback to visit changelog entries
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219 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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220 * @throws IllegalArgumentException if inspector argument is null
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221 */
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222 public void inspectChangelog(Inspector inspector) throws HgRuntimeException {
169
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223 if (inspector == null) {
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224 throw new IllegalArgumentException();
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225 }
512
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226 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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227 DataAccess da = null;
169
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228 try {
295
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229 da = getDataStream();
182
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230 internalInspectChangelog(da, inspector);
295
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231 } catch (IOException ex) {
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232 throw new HgInvalidFileException("Bundle.inspectChangelog failed", ex, bundleFile);
37
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233 } finally {
295
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234 if (da != null) {
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235 da.done();
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236 }
512
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237 lifecycleTearDown(lifecycle);
37
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238 }
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239 }
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240
423
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241 /**
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242 * @param inspector callback to visit manifest entries
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243 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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244 * @throws IllegalArgumentException if inspector argument is null
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245 */
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246 public void inspectManifest(Inspector inspector) throws HgRuntimeException {
169
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247 if (inspector == null) {
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248 throw new IllegalArgumentException();
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249 }
512
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250 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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251 DataAccess da = null;
36
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252 try {
295
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253 da = getDataStream();
169
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254 if (da.isEmpty()) {
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255 return;
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256 }
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257 skipGroup(da); // changelog
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258 internalInspectManifest(da, inspector);
295
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259 } catch (IOException ex) {
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260 throw new HgInvalidFileException("Bundle.inspectManifest failed", ex, bundleFile);
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261 } finally {
295
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262 if (da != null) {
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263 da.done();
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264 }
512
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265 lifecycleTearDown(lifecycle);
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266 }
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267 }
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268
423
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269 /**
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270 * @param inspector callback to visit file entries
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271 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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272 * @throws IllegalArgumentException if inspector argument is null
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273 */
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274 public void inspectFiles(Inspector inspector) throws HgRuntimeException {
169
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275 if (inspector == null) {
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276 throw new IllegalArgumentException();
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277 }
512
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278 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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279 DataAccess da = null;
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280 try {
295
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281 da = getDataStream();
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282 if (da.isEmpty()) {
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283 return;
169
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284 }
182
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285 skipGroup(da); // changelog
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286 if (da.isEmpty()) {
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287 return;
169
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288 }
182
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289 skipGroup(da); // manifest
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290 internalInspectFiles(da, inspector);
295
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291 } catch (IOException ex) {
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292 throw new HgInvalidFileException("Bundle.inspectFiles failed", ex, bundleFile);
169
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293 } finally {
295
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294 if (da != null) {
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295 da.done();
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296 }
512
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297 lifecycleTearDown(lifecycle);
169
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298 }
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299 }
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300
423
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301 /**
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diff changeset
302 * @param inspector visit complete bundle (changelog, manifest and file entries)
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303 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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304 * @throws IllegalArgumentException if inspector argument is null
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305 */
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diff changeset
306 public void inspectAll(Inspector inspector) throws HgRuntimeException {
169
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307 if (inspector == null) {
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308 throw new IllegalArgumentException();
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309 }
512
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310 final Lifecycle lifecycle = lifecycleSetUp(inspector);
295
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311 DataAccess da = null;
169
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312 try {
295
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313 da = getDataStream();
182
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diff changeset
314 internalInspectChangelog(da, inspector);
513
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diff changeset
315 if (flowControl.isStopped()) {
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diff changeset
316 return;
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diff changeset
317 }
182
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diff changeset
318 internalInspectManifest(da, inspector);
513
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diff changeset
319 if (flowControl.isStopped()) {
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diff changeset
320 return;
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321 }
182
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diff changeset
322 internalInspectFiles(da, inspector);
295
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323 } catch (IOException ex) {
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324 throw new HgInvalidFileException("Bundle.inspectAll failed", ex, bundleFile);
169
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325 } finally {
295
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326 if (da != null) {
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diff changeset
327 da.done();
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diff changeset
328 }
512
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diff changeset
329 lifecycleTearDown(lifecycle);
169
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330 }
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diff changeset
331 }
512
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diff changeset
332
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diff changeset
333 // initialize flowControl, check for concurrent usage, starts lifecyle, if any
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334 // return non-null only if inspector is interested in lifecycle events
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335 private Lifecycle lifecycleSetUp(Inspector inspector) throws ConcurrentModificationException {
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336 // Don't need flowControl in case Inspector doesn't implement Lifecycle,
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337 // however is handy not to expect it == null inside internalInspect*
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338 // XXX Once there's need to make this class thread-safe,
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339 // shall move flowControl to thread-local state.
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340 if (flowControl != null) {
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341 throw new ConcurrentModificationException("HgBundle is in use and not thread-safe yet");
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342 }
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343 flowControl = new Lifecycle.BasicCallback();
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344 final Lifecycle lifecycle = Adaptable.Factory.getAdapter(inspector, Lifecycle.class, null);
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345 if (lifecycle != null) {
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346 lifecycle.start(-1, flowControl, flowControl);
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347 }
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348 return lifecycle;
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349 }
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350
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351 private void lifecycleTearDown(Lifecycle lifecycle) {
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352 if (lifecycle != null) {
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353 lifecycle.finish(flowControl);
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354 }
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355 flowControl = null;
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356 }
169
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357
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358 private void internalInspectChangelog(DataAccess da, Inspector inspector) throws IOException {
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359 if (da.isEmpty()) {
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360 return;
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361 }
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362 inspector.changelogStart();
513
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363 if (flowControl.isStopped()) {
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364 return;
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365 }
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366 readGroup(da, inspector);
513
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367 if (flowControl.isStopped()) {
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368 return;
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369 }
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370 inspector.changelogEnd();
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371 }
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372
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373 private void internalInspectManifest(DataAccess da, Inspector inspector) throws IOException {
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374 if (da.isEmpty()) {
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375 return;
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376 }
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377 inspector.manifestStart();
513
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378 if (flowControl.isStopped()) {
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379 return;
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380 }
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381 readGroup(da, inspector);
513
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382 if (flowControl.isStopped()) {
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383 return;
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384 }
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385 inspector.manifestEnd();
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386 }
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387
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388 private void internalInspectFiles(DataAccess da, Inspector inspector) throws IOException {
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389 while (!da.isEmpty()) {
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390 int fnameLen = da.readInt();
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391 if (fnameLen <= 4) {
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392 break; // null chunk, the last one.
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393 }
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394 byte[] fnameBuf = new byte[fnameLen - 4];
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395 da.readBytes(fnameBuf, 0, fnameBuf.length);
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396 String name = new String(fnameBuf);
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397 inspector.fileStart(name);
513
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398 if (flowControl.isStopped()) {
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399 return;
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400 }
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401 readGroup(da, inspector);
513
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402 if (flowControl.isStopped()) {
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403 return;
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404 }
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405 inspector.fileEnd(name);
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406 }
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407 }
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408
169
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409 private static void readGroup(DataAccess da, Inspector inspector) throws IOException {
36
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410 int len = da.readInt();
169
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411 boolean good2go = true;
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412 while (len > 4 && !da.isEmpty() && good2go) {
36
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413 byte[] nb = new byte[80];
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414 da.readBytes(nb, 0, 80);
169
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415 int dataLength = len - 84 /* length field + 4 nodeids */;
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416 byte[] data = new byte[dataLength];
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417 da.readBytes(data, 0, dataLength);
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418 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess.
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419 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts),
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420 // regardless whether that slice has read it or not.
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421 GroupElement ge = new GroupElement(nb, slice);
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422 good2go = inspector.element(ge);
170
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diff changeset
423 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array)
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424 /// 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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diff changeset
425 // implementations out there do not retain GroupElement.rawData()
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426 len = da.isEmpty() ? 0 : da.readInt();
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427 }
169
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428 // need to skip up to group end if inspector told he don't want to continue with the group,
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429 // because outer code may try to read next group immediately as we return back.
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430 while (len > 4 && !da.isEmpty()) {
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431 da.skip(len - 4 /* length field */);
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432 len = da.isEmpty() ? 0 : da.readInt();
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433 }
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434 }
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435
169
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diff changeset
436 private static void skipGroup(DataAccess da) throws IOException {
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437 int len = da.readInt();
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diff changeset
438 while (len > 4 && !da.isEmpty()) {
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diff changeset
439 da.skip(len - 4); // sizeof(int)
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440 len = da.isEmpty() ? 0 : da.readInt();
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441 }
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442 }
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443
358
fc8bc2f1edbe Clean internal classes from public API
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diff changeset
444 @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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diff changeset
445 public static class GroupElement {
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446 private final byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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447 private final DataAccess dataAccess;
329
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diff changeset
448 private Patch patches;
169
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449
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450 GroupElement(byte[] fourNodeids, DataAccess rawDataAccess) {
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451 assert fourNodeids != null && fourNodeids.length == 80;
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452 header = fourNodeids;
169
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diff changeset
453 dataAccess = rawDataAccess;
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454 }
169
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diff changeset
455
358
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456 /**
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457 * <b>node</b> field of the group element
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458 * @return node revision, never <code>null</code>
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459 */
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460 public Nodeid node() {
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461 return Nodeid.fromBinary(header, 0);
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462 }
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463
358
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464 /**
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465 * <b>p1</b> <i>(parent 1)</i> field of the group element
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466 * @return revision of parent 1, never <code>null</code>
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467 */
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468 public Nodeid firstParent() {
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469 return Nodeid.fromBinary(header, 20);
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470 }
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471
358
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472 /**
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473 * <b>p2</b> <i>(parent 2)</i> field of the group element
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474 * @return revision of parent 2, never <code>null</code>
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475 */
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476 public Nodeid secondParent() {
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477 return Nodeid.fromBinary(header, 40);
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478 }
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479
358
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480 /**
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481 * <b>cs</b> <i>(changeset link)</i> field of the group element
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482 * @return changeset revision, never <code>null</code>
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483 */
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484 public Nodeid cset() {
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485 return Nodeid.fromBinary(header, 60);
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486 }
358
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487
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488 public byte[] rawDataByteArray() throws IOException { // XXX IOException or HgInvalidFileException?
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489 return rawData().byteArray();
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490 }
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491
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492 public byte[] apply(byte[] baseContent) throws IOException {
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493 return apply(new ByteArrayDataAccess(baseContent));
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494 }
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495
358
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496 /*package-local*/ DataAccess rawData() {
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497 return dataAccess;
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498 }
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499
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500 /*package-local*/ Patch patch() throws IOException {
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501 if (patches == null) {
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502 dataAccess.reset();
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503 patches = new Patch();
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504 patches.read(dataAccess);
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505 }
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506 return patches;
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507 }
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508
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509 /*package-local*/ byte[] apply(DataAccess baseContent) throws IOException {
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510 return patch().apply(baseContent, -1);
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511 }
357
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512
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513 public String toString() {
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514 int patchCount;
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515 try {
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516 patchCount = patch().count();
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517 } catch (IOException ex) {
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518 ex.printStackTrace();
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519 patchCount = -1;
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520 }
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521 return String.format("%s %s %s %s; patches:%d\n", node().shortNotation(), firstParent().shortNotation(), secondParent().shortNotation(), cset().shortNotation(), patchCount);
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522 }
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523 }
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524 }