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annotate src/org/tmatesoft/hg/internal/RevlogDump.java @ 624:507602cb4fb3

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FIXMEs and TODOs: pay some technical debt
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 20 May 2013 20:34:33 +0200
parents 47dfa0ec7e35
children
rev   line source
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1 /*
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2 * Copyright (c) 2010-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.BufferedInputStream;
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20 import java.io.ByteArrayInputStream;
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21 import java.io.DataInput;
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22 import java.io.DataInputStream;
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23 import java.io.File;
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24 import java.io.FileInputStream;
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25 import java.io.IOException;
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26 import java.io.UnsupportedEncodingException;
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27 import java.math.BigInteger;
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28 import java.nio.ByteBuffer;
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29 import java.nio.channels.FileChannel;
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30 import java.util.regex.Matcher;
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31 import java.util.regex.Pattern;
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32 import java.util.zip.DataFormatException;
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33 import java.util.zip.Inflater;
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34
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35 /**
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36 * Utility to test/debug/troubleshoot
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class RevlogDump {
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42
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43 /**
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44 * Takes 3 command line arguments -
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45 * repository path,
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46 * path to index file (i.e. store/data/hello.c.i) in the repository (relative)
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47 * and "dumpData" whether to print actual content or just revlog headers
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48 */
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49 public static void main(String[] args) throws Exception {
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50 String repo = "/temp/hg/hello/.hg/";
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51 String filename = "store/00changelog.i";
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52 // String filename = "store/data/hello.c.i";
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53 // String filename = "store/data/docs/readme.i";
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54 // System.out.println(escape("abc\0def\nzxc\tmnb"));
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55 boolean dumpDataFull = true;
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56 boolean dumpDataStats = false;
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57 if (args.length > 1) {
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58 repo = args[0];
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59 filename = args[1];
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60 dumpDataFull = args.length > 2 ? "dumpData".equals(args[2]) : false;
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61 dumpDataStats = args.length > 2 ? "dumpDataStats".equals(args[2]) : false;
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62 }
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63 final boolean needRevData = dumpDataFull || dumpDataStats;
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64 //
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65 RevlogReader rr = new RevlogReader(new File(repo, filename)).needData(needRevData);
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66 rr.init(needRevData);
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67 System.out.printf("%#8x, inline: %b\n", rr.versionField, rr.inlineData);
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68 System.out.println("Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid");
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69 ByteBuffer data = null;
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70 while (rr.hasMore()) {
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71 rr.readNext();
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72 System.out.printf("%4d:%14d %6X %10d %10d %10d %10d %8d %8d %040x\n", rr.entryIndex, rr.offset, rr.flags, rr.compressedLen, rr.actualLen, rr.baseRevision, rr.linkRevision, rr.parent1Revision, rr.parent2Revision, new BigInteger(rr.nodeid));
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73 if (needRevData) {
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74 String resultString;
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75 if (rr.getDataLength() == 0) {
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76 resultString = "<NO DATA>";
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77 } else {
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78 data = ensureCapacity(data, rr.getDataLength());
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79 rr.getData(data);
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80 data.flip();
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81 resultString = buildString(data, rr.isPatch(), dumpDataFull);
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82 }
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83 if (resultString.endsWith("\n")) {
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84 System.out.print(resultString);
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85 } else {
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86 System.out.println(resultString);
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87 }
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88 }
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89 }
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90 rr.done();
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91 }
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92
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93 private static ByteBuffer ensureCapacity(ByteBuffer src, int requiredCap) {
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94 if (src == null || src.capacity() < requiredCap) {
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95 return ByteBuffer.allocate((1 + requiredCap) * 3 / 2);
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96 }
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97 src.clear();
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98 return src;
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99 }
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100
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101 private static String buildString(ByteBuffer data, boolean isPatch, boolean completeDataDump) throws IOException, UnsupportedEncodingException {
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102 if (isPatch) {
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103 DataInputStream dis = new DataInputStream(new ByteArrayInputStream(data.array(), data.arrayOffset(), data.remaining()));
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104 StringBuilder sb = new StringBuilder();
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105 sb.append("<PATCH>:\n");
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106 while (dis.available() > 0) {
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107 int s = dis.readInt();
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108 int e = dis.readInt();
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109 int l = dis.readInt();
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110 sb.append(String.format("%d..%d, %d", s, e, l));
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111 if (completeDataDump) {
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112 byte[] src = new byte[l];
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113 dis.read(src, 0, l);
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114 sb.append(":");
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115 sb.append(escape(new String(src, 0, l, "UTF-8")));
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116 } else {
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117 dis.skipBytes(l);
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118 }
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119 sb.append('\n');
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120 }
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121 return sb.toString();
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122 } else {
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123 if (completeDataDump) {
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124 return escape(new String(data.array(), data.arrayOffset(), data.remaining(), "UTF-8"));
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125 }
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diff changeset
126 return String.format("<DATA>:%d bytes", data.remaining());
392
656a6c1346ff Extra debug option (dumpDataStats) and patch structure decoding for RevlogDump debug utility
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127 }
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diff changeset
128 }
533
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129
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130 private static Pattern controlCharPattern = Pattern.compile("\\p{Cntrl}");
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131 // \p{Cntrl} A control character: [\x00-\x1F\x7F]
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132 private static String[] replacements = new String[33];
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133 static {
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134 for (int i = 0; i < 32; i++) {
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135 // no idea why need FOUR backslashes to get only one in printout
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136 replacements[i] = String.format("\\\\%X", i);
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137 }
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138 replacements[32] = String.format("\\\\%X", 127);
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139 }
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140 // handy to get newline-separated data printed on newlines.
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141 // set to false for non-printable data (e.g. binaries, where \n doesn't make sense)
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142 private static boolean leaveNewlineInData = true;
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143
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144 private static String escape(CharSequence possiblyWithBinary) {
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diff changeset
145 Matcher m = controlCharPattern.matcher(possiblyWithBinary);
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diff changeset
146 StringBuffer rv = new StringBuffer();
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147 while (m.find()) {
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148 char c = m.group().charAt(0);
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diff changeset
149 if (leaveNewlineInData && c == '\n') {
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diff changeset
150 continue;
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diff changeset
151 }
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diff changeset
152 int x = (int) c;
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diff changeset
153 m.appendReplacement(rv, replacements[x == 127 ? 32 : x]);
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diff changeset
154 }
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155 m.appendTail(rv);
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diff changeset
156 return rv.toString();
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157 }
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diff changeset
158
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diff changeset
159 public static class RevlogReader {
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160
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diff changeset
161 private final File file;
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162 private boolean needRevData;
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163 private DataInputStream dis;
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164 private boolean inlineData;
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165 public int versionField;
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166 private FileChannel dataStream;
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167 public int entryIndex;
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168 private byte[] data;
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169 private int dataOffset, dataLen;
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diff changeset
170 public long offset;
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diff changeset
171 public int flags;
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diff changeset
172 public int baseRevision;
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diff changeset
173 public int linkRevision;
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diff changeset
174 public int parent1Revision;
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175 public int parent2Revision;
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176 public int compressedLen;
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177 public int actualLen;
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diff changeset
178 public byte[] nodeid = new byte[21]; // need 1 byte in the front to be 0 to avoid negative BigInts
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diff changeset
179
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diff changeset
180 public RevlogReader(File f) {
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diff changeset
181 assert f.getName().endsWith(".i");
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diff changeset
182 file = f;
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diff changeset
183 }
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diff changeset
184
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diff changeset
185 // affects #readNext()
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diff changeset
186 public RevlogReader needData(boolean needData) {
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diff changeset
187 needRevData = needData;
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diff changeset
188 return this;
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diff changeset
189 }
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diff changeset
190
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diff changeset
191 public void init(boolean mayRequireData) throws IOException {
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diff changeset
192 dis = new DataInputStream(new BufferedInputStream(new FileInputStream(file)));
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diff changeset
193 DataInput di = dis;
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diff changeset
194 dis.mark(10);
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diff changeset
195 versionField = di.readInt();
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diff changeset
196 dis.reset();
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diff changeset
197 final int INLINEDATA = 1 << 16;
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diff changeset
198 inlineData = (versionField & INLINEDATA) != 0;
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parents: 533
diff changeset
199
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diff changeset
200 dataStream = null;
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parents: 533
diff changeset
201 if (!inlineData && mayRequireData) {
47dfa0ec7e35 Effective revlog patching
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diff changeset
202 String fname = file.getAbsolutePath();
47dfa0ec7e35 Effective revlog patching
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diff changeset
203 dataStream = new FileInputStream(new File(fname.substring(0, fname.length()-2) + ".d")).getChannel();
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diff changeset
204 }
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parents: 533
diff changeset
205
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diff changeset
206 entryIndex = -1;
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diff changeset
207 }
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diff changeset
208
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diff changeset
209 public void startFrom(int startEntryIndex) throws IOException {
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diff changeset
210 if (dis == null) {
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diff changeset
211 throw new IllegalStateException("Call #init() first");
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diff changeset
212 }
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diff changeset
213 if (entryIndex != -1 && startEntryIndex != 0) {
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diff changeset
214 throw new IllegalStateException("Can't seek once iteration has started");
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diff changeset
215 }
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diff changeset
216 if (dataStream == null) {
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diff changeset
217 throw new IllegalStateException("Sorry, initial seek is now supported for separate .i/.d only");
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diff changeset
218 }
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diff changeset
219 long newPos = startEntryIndex * Internals.REVLOGV1_RECORD_SIZE, actualSkip;
47dfa0ec7e35 Effective revlog patching
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parents: 533
diff changeset
220 do {
47dfa0ec7e35 Effective revlog patching
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diff changeset
221 actualSkip = dis.skip(newPos);
47dfa0ec7e35 Effective revlog patching
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parents: 533
diff changeset
222 if (actualSkip <= 0) {
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diff changeset
223 throw new IllegalStateException(String.valueOf(actualSkip));
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diff changeset
224 }
47dfa0ec7e35 Effective revlog patching
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parents: 533
diff changeset
225 newPos -= actualSkip;
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diff changeset
226 } while (newPos > 0);
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diff changeset
227 entryIndex = startEntryIndex - 1;
47dfa0ec7e35 Effective revlog patching
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diff changeset
228 }
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diff changeset
229
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diff changeset
230 public boolean hasMore() throws IOException {
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diff changeset
231 return dis.available() > 0;
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diff changeset
232 }
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diff changeset
233
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diff changeset
234 public void readNext() throws IOException, DataFormatException {
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diff changeset
235 entryIndex++;
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diff changeset
236 DataInput di = dis;
47dfa0ec7e35 Effective revlog patching
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diff changeset
237 long l = di.readLong();
47dfa0ec7e35 Effective revlog patching
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diff changeset
238 offset = entryIndex == 0 ? 0 : (l >>> 16);
47dfa0ec7e35 Effective revlog patching
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parents: 533
diff changeset
239 flags = (int) (l & 0x0FFFF);
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diff changeset
240 compressedLen = di.readInt();
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diff changeset
241 actualLen = di.readInt();
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diff changeset
242 baseRevision = di.readInt();
47dfa0ec7e35 Effective revlog patching
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 533
diff changeset
243 linkRevision = di.readInt();
47dfa0ec7e35 Effective revlog patching
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diff changeset
244 parent1Revision = di.readInt();
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parents: 533
diff changeset
245 parent2Revision = di.readInt();
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diff changeset
246 di.readFully(nodeid, 1, 20);
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diff changeset
247 dis.skipBytes(12);
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diff changeset
248 // CAN'T USE skip() here without extra precautions. E.g. I ran into situation when
47dfa0ec7e35 Effective revlog patching
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parents: 533
diff changeset
249 // buffer was 8192 and BufferedInputStream was at position 8182 before attempt to skip(12).
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parents: 533
diff changeset
250 // BIS silently skips available bytes and leaves me two extra bytes that ruin the rest of the code.
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diff changeset
251 data = new byte[compressedLen];
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diff changeset
252 if (inlineData) {
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diff changeset
253 di.readFully(data);
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diff changeset
254 } else if (needRevData) {
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diff changeset
255 dataStream.position(offset);
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diff changeset
256 dataStream.read(ByteBuffer.wrap(data));
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diff changeset
257 }
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diff changeset
258 if (needRevData) {
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diff changeset
259 if (compressedLen == 0) {
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diff changeset
260 data = null;
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diff changeset
261 dataOffset = dataLen = 0;
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diff changeset
262 } else {
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diff changeset
263 if (data[0] == 0x78 /* 'x' */) {
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diff changeset
264 Inflater zlib = new Inflater();
47dfa0ec7e35 Effective revlog patching
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265 zlib.setInput(data, 0, compressedLen);
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266 byte[] result = new byte[actualLen * 3];
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267 int resultLen = zlib.inflate(result);
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268 zlib.end();
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269 data = result;
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270 dataOffset = 0;
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271 dataLen = resultLen;
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272 } else if (data[0] == 0x75 /* 'u' */) {
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273 dataOffset = 1;
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274 dataLen = data.length - 1;
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275 } else {
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276 dataOffset = 0;
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277 dataLen = data.length;
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278 }
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279 }
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280 }
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281 }
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282
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283 public int getDataLength() {
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284 // NOT actualLen - there are empty patch revisions (dataLen == 0, but actualLen == previous length)
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285 // NOT compressedLen - zip data is uncompressed
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286 return dataLen;
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287 }
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288
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289 public void getData(ByteBuffer bb) {
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290 assert bb.remaining() >= dataLen;
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291 bb.put(data, dataOffset, dataLen);
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292 }
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293
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294 public boolean isPatch() {
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295 assert entryIndex != -1;
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296 return baseRevision != entryIndex;
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297 }
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298
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299 public boolean isInline() {
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300 assert dis != null;
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301 return inlineData;
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302 }
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303
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304 public void done() throws IOException {
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305 dis.close();
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306 dis = null;
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307 if (dataStream != null) {
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308 dataStream.close();
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309 dataStream = null;
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310 }
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311 }
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312 }
0
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313 }