Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgBundle.java @ 423:9c9c442b5f2e

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Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 23 Mar 2012 22:51:18 +0100
parents 528b6780a8bd
children 31a89587eb04
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
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22 import org.tmatesoft.hg.core.HgBadArgumentException;
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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.DataAccess;
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28 import org.tmatesoft.hg.internal.DataAccessProvider;
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29 import org.tmatesoft.hg.internal.DigestHelper;
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30 import org.tmatesoft.hg.internal.Experimental;
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31 import org.tmatesoft.hg.internal.InflaterDataAccess;
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32 import org.tmatesoft.hg.internal.Patch;
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33 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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34 import org.tmatesoft.hg.util.CancelledException;
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35
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36 /**
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37 * WORK IN PROGRESS
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38 *
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39 * @see http://mercurial.selenic.com/wiki/BundleFormat
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40 *
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public class HgBundle {
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46 private final File bundleFile;
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47 private final DataAccessProvider accessProvider;
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48 // private final SessionContext sessionContext;
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49
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50 HgBundle(SessionContext ctx, DataAccessProvider dap, File bundle) {
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51 // sessionContext = ctx;
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52 accessProvider = dap;
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53 bundleFile = bundle;
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54 }
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56 private DataAccess getDataStream() throws IOException {
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57 DataAccess da = accessProvider.create(bundleFile);
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58 byte[] signature = new byte[6];
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59 if (da.length() > 6) {
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60 da.readBytes(signature, 0, 6);
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61 if (signature[0] == 'H' && signature[1] == 'G' && signature[2] == '1' && signature[3] == '0') {
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62 if (signature[4] == 'G' && signature[5] == 'Z') {
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63 return new InflaterDataAccess(da, 6, da.length() - 6);
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64 }
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65 if (signature[4] == 'B' && signature[5] == 'Z') {
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66 throw HgRepository.notImplemented();
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67 }
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68 if (signature[4] != 'U' || signature[5] != 'N') {
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69 throw new HgInvalidStateException(String.format("Bad bundle signature: %s", String.valueOf(signature)));
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70 }
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71 // "...UN", fall-through
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72 } else {
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73 da.reset();
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74 }
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75 }
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76 return da;
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77 }
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79 private int uses = 0;
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80 public HgBundle link() {
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81 uses++;
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82 return this;
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83 }
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84 public void unlink() {
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85 uses--;
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86 if (uses == 0 && bundleFile != null) {
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87 bundleFile.deleteOnExit();
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88 }
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89 }
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90 public boolean inUse() {
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91 return uses > 0;
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92 }
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93
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94 /**
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95 * Get changes recorded in the bundle that are missing from the supplied repository.
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96 * @param hgRepo repository that shall possess base revision for this bundle
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97 * @param inspector callback to get each changeset found
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98 */
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99 public void changes(final HgRepository hgRepo, final HgChangelog.Inspector inspector) throws HgRuntimeException {
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100 Inspector bundleInsp = new Inspector() {
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101 DigestHelper dh = new DigestHelper();
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102 boolean emptyChangelog = true;
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103 private DataAccess prevRevContent;
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104 private int revisionIndex;
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105
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106 public void changelogStart() {
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107 emptyChangelog = true;
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108 revisionIndex = 0;
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109 }
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111 public void changelogEnd() {
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112 if (emptyChangelog) {
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113 throw new IllegalStateException("No changelog group in the bundle"); // XXX perhaps, just be silent and/or log?
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114 }
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115 }
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116
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117 /*
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118 * Despite that BundleFormat wiki says: "Each Changelog entry patches the result of all previous patches
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119 * (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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120 * it seems not to hold true. Instead, each entry patches previous one, regardless of whether the one
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121 * before is its parent (i.e. ge.firstParent()) or not.
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122 *
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123 Actual state in the changelog.i
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124 Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid
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125 50: 9212 0 209 329 48 50 49 -1 f1db8610da62a3e0beb8d360556ee1fd6eb9885e
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126 51: 9421 0 278 688 48 51 50 -1 9429c7bd1920fab164a9d2b621d38d57bcb49ae0
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127 52: 9699 0 154 179 52 52 50 -1 30bd389788464287cee22ccff54c330a4b715de5
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128 53: 9853 0 133 204 52 53 51 52 a6f39e595b2b54f56304470269a936ead77f5725
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129 54: 9986 0 156 182 54 54 52 -1 fd4f2c98995beb051070630c272a9be87bef617d
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130
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131 Excerpt from bundle (nodeid, p1, p2, cs):
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132 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 26e3eeaa39623de552b45ee1f55c14f36460f220 0000000000000000000000000000000000000000 f1db8610da62a3e0beb8d360556ee1fd6eb9885e; patches:4
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133 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 9429c7bd1920fab164a9d2b621d38d57bcb49ae0; patches:3
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134 > 30bd389788464287cee22ccff54c330a4b715de5 f1db8610da62a3e0beb8d360556ee1fd6eb9885e 0000000000000000000000000000000000000000 30bd389788464287cee22ccff54c330a4b715de5; patches:3
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135 a6f39e595b2b54f56304470269a936ead77f5725 9429c7bd1920fab164a9d2b621d38d57bcb49ae0 30bd389788464287cee22ccff54c330a4b715de5 a6f39e595b2b54f56304470269a936ead77f5725; patches:3
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136 fd4f2c98995beb051070630c272a9be87bef617d 30bd389788464287cee22ccff54c330a4b715de5 0000000000000000000000000000000000000000 fd4f2c98995beb051070630c272a9be87bef617d; patches:3
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137
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138 To recreate 30bd..e5, one have to take content of 9429..e0, not its p1 f1db..5e
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139 */
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140 public boolean element(GroupElement ge) {
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141 emptyChangelog = false;
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142 HgChangelog changelog = hgRepo.getChangelog();
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143 try {
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144 if (prevRevContent == null) {
274
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145 if (ge.firstParent().isNull() && ge.secondParent().isNull()) {
169
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146 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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147 } else {
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148 final Nodeid base = ge.firstParent();
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149 if (!changelog.isKnown(base) /*only first parent, that's Bundle contract*/) {
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150 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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151 }
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152 ByteArrayChannel bac = new ByteArrayChannel();
418
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153 changelog.rawContent(base, bac); // TODO post-1.0 get DataAccess directly, to avoid
169
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154 // extra byte[] (inside ByteArrayChannel) duplication just for the sake of subsequent ByteArrayDataChannel wrap.
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155 prevRevContent = new ByteArrayDataAccess(bac.toArray());
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156 }
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157 }
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158 //
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159 byte[] csetContent = ge.apply(prevRevContent);
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160 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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161 if (!ge.node().equalsTo(dh.asBinary())) {
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162 throw new HgInvalidStateException(String.format("Integrity check failed on %s, node: %s", bundleFile, ge.node().shortNotation()));
169
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163 }
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164 ByteArrayDataAccess csetDataAccess = new ByteArrayDataAccess(csetContent);
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165 RawChangeset cs = RawChangeset.parse(csetDataAccess);
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166 inspector.next(revisionIndex++, ge.node(), cs);
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167 prevRevContent.done();
169
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168 prevRevContent = csetDataAccess.reset();
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169 } catch (CancelledException ex) {
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170 return false;
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171 } catch (IOException ex) {
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172 throw new HgInvalidFileException("Invalid bundle file", ex, bundleFile); // TODO post-1.0 revisit exception handling
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173 } catch (HgBadArgumentException ex) {
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174 throw new HgInvalidControlFileException("Invalid bundle file", ex, bundleFile);
169
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175 }
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176 return true;
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177 }
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178
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179 public void manifestStart() {}
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180 public void manifestEnd() {}
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181 public void fileStart(String name) {}
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182 public void fileEnd(String name) {}
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183
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184 };
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185 inspectChangelog(bundleInsp);
169
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186 }
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187
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188 // callback to minimize amount of Strings and Nodeids instantiated
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189 public interface Inspector {
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190 void changelogStart();
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191
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192 void changelogEnd();
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193
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194 void manifestStart();
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195
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196 void manifestEnd();
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197
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198 void fileStart(String name);
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199
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200 void fileEnd(String name);
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201
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202 /**
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203 * XXX desperately need exceptions here
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204 * @param element data element, instance might be reused, don't keep a reference to it or its raw data
169
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205 * @return <code>true</code> to continue
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206 */
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207 boolean element(GroupElement element);
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208 }
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209
423
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210 /**
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211 * @param inspector callback to visit changelog entries
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212 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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213 * @throws IllegalArgumentException if inspector argument is null
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214 */
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215 public void inspectChangelog(Inspector inspector) throws HgRuntimeException {
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216 if (inspector == null) {
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217 throw new IllegalArgumentException();
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218 }
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219 DataAccess da = null;
169
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220 try {
295
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221 da = getDataStream();
182
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222 internalInspectChangelog(da, inspector);
295
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223 } catch (IOException ex) {
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224 throw new HgInvalidFileException("Bundle.inspectChangelog failed", ex, bundleFile);
37
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225 } finally {
295
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226 if (da != null) {
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227 da.done();
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228 }
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229 }
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230 }
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231
423
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232 /**
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233 * @param inspector callback to visit manifest entries
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234 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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235 * @throws IllegalArgumentException if inspector argument is null
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236 */
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237 public void inspectManifest(Inspector inspector) throws HgRuntimeException {
169
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238 if (inspector == null) {
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239 throw new IllegalArgumentException();
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240 }
295
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241 DataAccess da = null;
36
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242 try {
295
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243 da = getDataStream();
169
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244 if (da.isEmpty()) {
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245 return;
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246 }
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247 skipGroup(da); // changelog
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248 internalInspectManifest(da, inspector);
295
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249 } catch (IOException ex) {
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250 throw new HgInvalidFileException("Bundle.inspectManifest failed", ex, bundleFile);
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251 } finally {
295
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252 if (da != null) {
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253 da.done();
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254 }
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255 }
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256 }
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257
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258 /**
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259 * @param inspector callback to visit file entries
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260 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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261 * @throws IllegalArgumentException if inspector argument is null
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262 */
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263 public void inspectFiles(Inspector inspector) throws HgRuntimeException {
169
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264 if (inspector == null) {
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265 throw new IllegalArgumentException();
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266 }
295
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267 DataAccess da = null;
169
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268 try {
295
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269 da = getDataStream();
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270 if (da.isEmpty()) {
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271 return;
169
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272 }
182
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273 skipGroup(da); // changelog
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274 if (da.isEmpty()) {
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275 return;
169
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276 }
182
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277 skipGroup(da); // manifest
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278 internalInspectFiles(da, inspector);
295
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279 } catch (IOException ex) {
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280 throw new HgInvalidFileException("Bundle.inspectFiles failed", ex, bundleFile);
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281 } finally {
295
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282 if (da != null) {
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283 da.done();
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284 }
169
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285 }
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286 }
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287
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288 /**
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289 * @param inspector visit complete bundle (changelog, manifest and file entries)
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290 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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291 * @throws IllegalArgumentException if inspector argument is null
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292 */
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293 public void inspectAll(Inspector inspector) throws HgRuntimeException {
169
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294 if (inspector == null) {
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295 throw new IllegalArgumentException();
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296 }
295
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297 DataAccess da = null;
169
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298 try {
295
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299 da = getDataStream();
182
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300 internalInspectChangelog(da, inspector);
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301 internalInspectManifest(da, inspector);
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302 internalInspectFiles(da, inspector);
295
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303 } catch (IOException ex) {
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304 throw new HgInvalidFileException("Bundle.inspectAll failed", ex, bundleFile);
169
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305 } finally {
295
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306 if (da != null) {
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307 da.done();
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308 }
169
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309 }
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310 }
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311
182
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312 private void internalInspectChangelog(DataAccess da, Inspector inspector) throws IOException {
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313 if (da.isEmpty()) {
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314 return;
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315 }
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316 inspector.changelogStart();
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317 readGroup(da, inspector);
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318 inspector.changelogEnd();
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319 }
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320
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321 private void internalInspectManifest(DataAccess da, Inspector inspector) throws IOException {
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322 if (da.isEmpty()) {
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323 return;
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324 }
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325 inspector.manifestStart();
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326 readGroup(da, inspector);
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327 inspector.manifestEnd();
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328 }
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329
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330 private void internalInspectFiles(DataAccess da, Inspector inspector) throws IOException {
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331 while (!da.isEmpty()) {
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332 int fnameLen = da.readInt();
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333 if (fnameLen <= 4) {
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334 break; // null chunk, the last one.
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335 }
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336 byte[] fnameBuf = new byte[fnameLen - 4];
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337 da.readBytes(fnameBuf, 0, fnameBuf.length);
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338 String name = new String(fnameBuf);
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339 inspector.fileStart(name);
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340 readGroup(da, inspector);
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341 inspector.fileEnd(name);
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342 }
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343 }
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344
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345 private static void readGroup(DataAccess da, Inspector inspector) throws IOException {
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346 int len = da.readInt();
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347 boolean good2go = true;
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348 while (len > 4 && !da.isEmpty() && good2go) {
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349 byte[] nb = new byte[80];
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350 da.readBytes(nb, 0, 80);
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351 int dataLength = len - 84 /* length field + 4 nodeids */;
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352 byte[] data = new byte[dataLength];
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353 da.readBytes(data, 0, dataLength);
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354 DataAccess slice = new ByteArrayDataAccess(data); // XXX in fact, may pass a slicing DataAccess.
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355 // Just need to make sure that we seek to proper location afterwards (where next GroupElement starts),
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356 // regardless whether that slice has read it or not.
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357 GroupElement ge = new GroupElement(nb, slice);
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358 good2go = inspector.element(ge);
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359 slice.done(); // BADA doesn't implement done(), but it could (e.g. free array)
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360 /// 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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361 // implementations out there do not retain GroupElement.rawData()
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362 len = da.isEmpty() ? 0 : da.readInt();
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363 }
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364 // need to skip up to group end if inspector told he don't want to continue with the group,
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365 // because outer code may try to read next group immediately as we return back.
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366 while (len > 4 && !da.isEmpty()) {
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367 da.skip(len - 4 /* length field */);
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368 len = da.isEmpty() ? 0 : da.readInt();
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369 }
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370 }
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371
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372 private static void skipGroup(DataAccess da) throws IOException {
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373 int len = da.readInt();
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374 while (len > 4 && !da.isEmpty()) {
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375 da.skip(len - 4); // sizeof(int)
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376 len = da.isEmpty() ? 0 : da.readInt();
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377 }
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378 }
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379
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380 @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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381 public static class GroupElement {
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382 private final byte[] header; // byte[80] takes 120 bytes, 4 Nodeids - 192
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383 private final DataAccess dataAccess;
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384 private Patch patches;
169
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385
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386 GroupElement(byte[] fourNodeids, DataAccess rawDataAccess) {
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387 assert fourNodeids != null && fourNodeids.length == 80;
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388 header = fourNodeids;
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389 dataAccess = rawDataAccess;
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390 }
169
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391
358
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392 /**
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393 * <b>node</b> field of the group element
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394 * @return node revision, never <code>null</code>
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395 */
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396 public Nodeid node() {
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397 return Nodeid.fromBinary(header, 0);
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398 }
169
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399
358
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400 /**
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401 * <b>p1</b> <i>(parent 1)</i> field of the group element
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402 * @return revision of parent 1, never <code>null</code>
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403 */
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404 public Nodeid firstParent() {
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405 return Nodeid.fromBinary(header, 20);
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406 }
169
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407
358
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408 /**
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409 * <b>p2</b> <i>(parent 2)</i> field of the group element
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410 * @return revision of parent 2, never <code>null</code>
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411 */
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412 public Nodeid secondParent() {
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413 return Nodeid.fromBinary(header, 40);
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414 }
169
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415
358
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416 /**
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417 * <b>cs</b> <i>(changeset link)</i> field of the group element
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418 * @return changeset revision, never <code>null</code>
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419 */
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420 public Nodeid cset() {
36
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421 return Nodeid.fromBinary(header, 60);
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422 }
358
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423
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424 public byte[] rawDataByteArray() throws IOException { // XXX IOException or HgInvalidFileException?
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425 return rawData().byteArray();
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426 }
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427
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428 public byte[] apply(byte[] baseContent) throws IOException {
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429 return apply(new ByteArrayDataAccess(baseContent));
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430 }
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431
358
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432 /*package-local*/ DataAccess rawData() {
169
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433 return dataAccess;
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434 }
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435
329
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436 /*package-local*/ Patch patch() throws IOException {
169
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437 if (patches == null) {
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438 dataAccess.reset();
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439 patches = new Patch();
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440 patches.read(dataAccess);
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441 }
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442 return patches;
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443 }
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444
358
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445 /*package-local*/ byte[] apply(DataAccess baseContent) throws IOException {
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446 return patch().apply(baseContent, -1);
169
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447 }
357
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448
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449 public String toString() {
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450 int patchCount;
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451 try {
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452 patchCount = patch().count();
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453 } catch (IOException ex) {
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454 ex.printStackTrace();
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455 patchCount = -1;
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456 }
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457 return String.format("%s %s %s %s; patches:%d\n", node().shortNotation(), firstParent().shortNotation(), secondParent().shortNotation(), cset().shortNotation(), patchCount);
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458 }
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459 }
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460 }