1 | package org.greenstone.atea;
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2 |
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3 |
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4 | import java.io.*;
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5 | import java.util.Properties;
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6 | import java.util.zip.GZIPInputStream;
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7 | import org.apache.log4j.Logger;
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8 |
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9 | /**
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10 | * The main() method of this class takes a folder of warc.wet(.gz) files and goes through
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11 | * the WET records in each, putting each WET record into a file. Each file is put into a
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12 | * keep or discard folder, based on content-length and number of lines.
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13 | * A single instance of the WETProcessor class processes a single unzipped warc.wet file.
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14 | *
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15 | * To compile, including the jars in lib/ for compiling.
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16 | * maori-lang-detection/src$ javac -cp ".:../lib/*" org/greenstone/atea/WETProcessor.java
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17 | *
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18 | * To run, passing the log4j and other properties files in conf/ folder:
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19 | * maori-lang-detection/src$ java -cp ".:../conf:../lib/*" org.greenstone.atea.WETProcessor <folder containing warc.wet(.gz) files> <outputFolder>
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20 | *
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21 | * e.g.
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22 | * - java -cp ".:../conf" org.greenstone.atea.WETProcessor ../tmp/processWET /Scratch/ak19/gs3-extensions/maori-lang-detection/tmp/processedWET
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23 | * - java -cp ".:../conf" org.greenstone.atea.WETProcessor ../tmp/processWET /Scratch/ak19/gs3-extensions/maori-lang-detection/tmp/processedWET
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24 | * - java -cp ".:../conf" org.greenstone.atea.WETProcessor ../tmp/processWET /Scratch/ak19/gs3-extensions/maori-lang-detection/tmp/processedWET 2>&1 | less
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25 | *
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26 | */
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27 | public class WETProcessor {
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28 | //private static Logger logger = Logger.getLogger(org.greenstone.atea.WETProcessor.class.getName());
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29 | private Properties configProperties = null;
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30 |
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31 |
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32 | // arbitrary cut-off values, TODO: put in .properties file
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33 | private static final int MIN_CONTENT_LENGTH = 100;
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34 | private static final int MIN_LINE_COUNT = 2;
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35 | private static final int MIN_CONTENT_LENGTH_WRAPPED_LINE = 500;
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36 | private static final int MIN_SPACES_IN_A_WRAPPED_LINE = 10;
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37 |
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38 | // keep a count of all the records that all WETProcessors instantiated
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39 | // by our main method have processed
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40 | private static int recordCount = 0;
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41 |
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42 | private final File outputFolder;
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43 | private final String WETFileID;
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44 |
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45 |
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46 | public static int getRecordCount() { return recordCount; }
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47 |
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48 | public WETProcessor(File inFile, File outFolder, Properties configProps) {
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49 | this.outputFolder = outFolder;
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50 | this.configProperties = configProps;
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51 |
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52 | StringBuilder record = null;
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53 | String line = null;
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54 | boolean readingRecord = false;
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55 |
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56 | //this.recordCount = 0;
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57 |
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58 | int contentLength = -1; // of record
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59 | int lineCount = -1; // actual number of non-empty lines in record body (i.e. excludes WET/WARC headers)
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60 |
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61 | // We just want a unique recordID prefix, which we get from the wet file name suffix:
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62 | // inFile name looks something like MAORI-CC-2019-30-20190902100139-000000.warc.wet
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63 | // the prefix will be everything after the last hyphen and without file extension,
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64 | // so "000000" in our example.
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65 |
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66 | String fileID = inFile.getName();
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67 | fileID = fileID.substring(fileID.lastIndexOf("-")+1);
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68 | fileID = fileID.substring(0, fileID.indexOf("."));
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69 | this.WETFileID = fileID;
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70 |
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71 | // read from WETfile
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72 | try (BufferedReader reader = new BufferedReader(new FileReader(inFile))) {
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73 |
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74 | while((line = reader.readLine()) != null) { // readLine removes newline separator
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75 |
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76 | if(line.startsWith("WARC-Type: warcinfo")) {
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77 | readingRecord = false;
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78 | record = null; // drop this record, which is just an info record not actual web page's text
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79 | recordCount--;
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80 | continue;
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81 | }
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82 |
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83 | if(line.startsWith("WARC/1.0")) { // finished previous WET record
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84 | // process any previous record
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85 | if(record != null) {
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86 | processWETrecord(recordCount, contentLength, lineCount, record.toString());
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87 | record = null;
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88 | contentLength = -1;
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89 | lineCount = -1;
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90 | }
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91 |
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92 | recordCount++;
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93 | // get ready to start a new record
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94 | readingRecord = true;
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95 | record = new StringBuilder();
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96 | }
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97 |
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98 | if(readingRecord) { // append current line to current record
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99 |
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100 | record.append(line + "\n"); // add back (unix style) line ending
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101 |
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102 | // if the line is non-empty
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103 | // AND if we've started counting lines, which happens only when the current
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104 | // line is past WARC/WET headers and we're into the actual body portion
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105 | // of the WET record,
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106 | // start incrementing the line counter.
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107 | if(lineCount >= 0 && !line.trim().equals("")) {
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108 | lineCount++;
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109 | }
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110 | else if(line.startsWith("Content-Length:")) {
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111 | String contentLengthStr = line.substring("Content-Length:".length()).trim();
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112 | contentLength = Integer.parseInt(contentLengthStr);
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113 | lineCount = 0;
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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 | }
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119 |
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120 | // flush the last record. If it was a warcinfo record, record would be null here
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121 | if(record != null) {
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122 | processWETrecord(recordCount, contentLength, lineCount, record.toString());
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123 | record = null;
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124 | }
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125 |
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126 | } catch(IOException ioe) {
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127 | ioe.printStackTrace();
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128 | }
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129 | }
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130 |
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131 |
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132 | private void processWETrecord(int recordID, int contentLength, int lineCount, String record)
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133 | {
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134 | System.err.println("WET #" + this.WETFileID + " record #" + recordID
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135 | + " - contentLength: " + contentLength
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136 | + " - lineCount: " + lineCount);
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137 | //System.err.println(record);
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138 | //System.err.println("--------------------------");
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139 |
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140 | String paddedFileName = String.format("%04d.txt", recordID);
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141 |
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142 | File discardFolder = new File(this.outputFolder, "discard");
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143 | File keepFolder = new File(this.outputFolder, "keep");
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144 | File parentFolder = null;
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145 |
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146 | if(lineCount >= MIN_LINE_COUNT && contentLength >= MIN_CONTENT_LENGTH) {
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147 | parentFolder = keepFolder;
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148 | System.err.println("@@@KEEPING");
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149 | } else if(contentLength >= MIN_CONTENT_LENGTH_WRAPPED_LINE) {
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150 | int countSpaces = 0;
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151 | for(int i = 0; i < record.length(); i++) {
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152 | if(record.charAt(i) == ' ') countSpaces++;
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153 | }
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154 | if(countSpaces >= MIN_SPACES_IN_A_WRAPPED_LINE) {
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155 | // So we have at least 500 chars (possibly on a single wrapped line)
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156 | // containing at least 10 spaces. Such a record is also worth keeping.
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157 | parentFolder = keepFolder;
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158 | }
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159 | }
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160 |
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161 | // if parentFolder still not set, set to discard pile folder
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162 | if(parentFolder == null) {
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163 | parentFolder = discardFolder;
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164 | System.err.println("@@@DISCARDING");
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165 | }
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166 |
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167 | System.err.println("--------------------------");
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168 |
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169 | File outFile = new File(parentFolder, this.WETFileID + "-" + paddedFileName);
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170 |
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171 | try (BufferedWriter writer = new BufferedWriter(new FileWriter(outFile))) {
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172 | writer.write(record);
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173 | writer.close();
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174 | } catch(IOException ioe) {
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175 | ioe.printStackTrace();
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176 | System.err.println("\n@@@@@@@@@ Error writing to file " + outFile);
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177 | }
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178 | }
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179 |
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180 |
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181 | public static void printUsage() {
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182 | System.err.println("Run this program as:");
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183 | System.err.println("\tWetProcessor <folder containing wet(.gz) files> <output folder path>");
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184 | }
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185 |
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186 | /** Filename filter that only lists warc.wet files or else warc.wet.gz files
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187 | * for which unzipped warc.wet equivalents don't yet exist.
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188 | */
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189 | private static class WETFilenameFilter implements FilenameFilter {
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190 |
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191 | public boolean accept(File dir, String name) {
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192 | if(name.endsWith(".warc.wet")) {
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193 | System.err.println("Will include " + name + " for processing.");
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194 | return true;
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195 | }
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196 |
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197 | if(name.endsWith(".warc.wet.gz")) {
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198 | String nameWithoutGZext = name.substring(0, name.lastIndexOf(".gz"));
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199 | File unzippedVersion = new File(dir, nameWithoutGZext);
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200 | if(unzippedVersion.exists()) {
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201 | System.err.println("--- Unzipped version " + unzippedVersion + " exists.");
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202 | System.err.println("Skipping " + name);
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203 | return false; // don't count gzipped version if unzipped version exists.
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204 | }
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205 | else {
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206 | System.err.println("Only zipped version " + name + " exists.");
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207 | return true; // No unzipped version, so have to work with gzipped version
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208 | }
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209 | }
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210 |
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211 | System.err.println("Skipping " + name);
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212 |
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213 | // we're not even interested in any other file extensions
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214 | return false;
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215 | }
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216 | }
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217 |
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218 | public static void main(String[] args) {
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219 | if(args.length != 2) {
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220 | printUsage();
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221 | return;
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222 | }
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223 |
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224 |
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225 | File WETFileDir = new File(args[0]);
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226 | if(!WETFileDir.exists() || !WETFileDir.isDirectory()) {
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227 | System.err.println("Error: " + args[0] + " does not exist or is not a directory");
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228 | return;
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229 | }
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230 |
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231 | File outFolder = new File(args[1]);
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232 | if(!outFolder.exists() || !outFolder.isDirectory()) {
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233 | System.err.println("Error: " + args[1] + " does not exist or is not a directory.");
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234 | return;
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235 | }
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236 |
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237 | File discardFolder = new File(outFolder, "discard");
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238 | if(!discardFolder.exists()) {
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239 | discardFolder.mkdir();
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240 | }
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241 | File keepFolder = new File(outFolder, "keep");
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242 | if(!keepFolder.exists()) {
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243 | keepFolder.mkdir();
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244 | }
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245 |
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246 | // load up the properties from the config file
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247 | Properties configProps;
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248 | try (InputStream infile = Class.forName("org.greenstone.atea.WETProcessor").getClassLoader().getResourceAsStream("config.properties")) {
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249 | configProps = new Properties();
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250 | configProps.load(infile);
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251 | infile.close();
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252 |
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253 | } catch(Exception e) {
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254 | System.err.println("Exception attempting to read properties from config.properties.");
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255 | e.printStackTrace();
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256 | return;
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257 | }
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258 |
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259 | // Will list all the warc.wet files in the input directory or else their gzipped versions
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260 | File[] WETFiles = WETFileDir.listFiles(new WETFilenameFilter());
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261 |
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262 | for(int i = 0; i < WETFiles.length; i++) {
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263 | File WETFile = WETFiles[i];
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264 | System.err.println("Processing WETfile: " + WETFile);
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265 |
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266 | // Any .gz files listed means they haven't been unzipped yet. So unzip.
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267 | String WETFilename = WETFile.toString();
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268 | if(WETFilename.endsWith(".gz")) {
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269 | File GZippedWETFile = WETFile;
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270 | String WETGZippedFilename = WETFilename;
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271 | WETFilename = WETFilename.substring(0, WETFilename.lastIndexOf(".gz"));
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272 |
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273 | WETFile = new File(WETFilename);
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274 | Utility.unzipFile(GZippedWETFile, WETFile);
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275 | }
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276 | // hereafter all WETFiles should refer to the unzipped version
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277 | // Check the unzipped WETFile exists
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278 |
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279 | if(!WETFile.exists() || !WETFile.isFile()) {
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280 | System.err.println("Error: " + WETFile + " does not exist (failure to unzip?)");
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281 | return;
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282 | }
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283 |
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284 | // Finally, we can process this WETFile's records into the keep and discard pile
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285 | System.err.println("Off to process " + WETFile);
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286 | WETProcessor processor = new WETProcessor(WETFile, outFolder, configProps);
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287 |
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288 | }
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289 |
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290 | return;
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291 | }
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292 | }
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