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annotate src/luan/modules/lucene/Lucene.luan @ 775:1a68fc55a80c

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simplify dir structure
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 26 Aug 2016 14:36:40 -0600
parents lucene/src/luan/modules/lucene/Lucene.luan@50f279d3f889
children 6b8ea0a9b7c9
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1 java()
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2 local Luan = require "luan:Luan.luan"
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3 local error = Luan.error
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4 local ipairs = Luan.ipairs or error()
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5 local type = Luan.type or error()
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6 local Html = require "luan:Html.luan"
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7 local Io = require "luan:Io.luan"
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8 local uri = Io.uri or error()
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9 local String = require "luan:String.luan"
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10 local matches = String.matches or error()
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11 local Rpc = require "luan:Rpc.luan"
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12 local LuceneIndex = require "java:luan.modules.lucene.LuceneIndex"
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13 local NumberFieldParser = require "java:luan.modules.lucene.queryparser.NumberFieldParser"
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14 local StringFieldParser = require "java:luan.modules.lucene.queryparser.StringFieldParser"
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15 local SaneQueryParser = require "java:luan.modules.lucene.queryparser.SaneQueryParser"
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16 local Version = require "java:org.apache.lucene.util.Version"
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17 local EnglishAnalyzer = require "java:org.apache.lucene.analysis.en.EnglishAnalyzer"
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18
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19
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20 local M = {}
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21
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22 M.instances = {}
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23
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24 M.type = {
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25 string = LuceneIndex.STRING_FIELD_PARSER;
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26 integer = NumberFieldParser.INT;
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27 long = NumberFieldParser.LONG;
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28 double = NumberFieldParser.DOUBLE;
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30 english = StringFieldParser.new(EnglishAnalyzer.new(Version.LUCENE_CURRENT))
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31 }
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32
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33 M.literal = SaneQueryParser.literal
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34
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35 function M.index(index_dir,default_type,default_fields)
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36 local index = {}
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37 index.dir = index_dir
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38 local java_index = LuceneIndex.new(index_dir,default_type,default_fields)
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39 index.indexed_fields = java_index.indexedFieldsMeta.newTable()
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41 -- index.indexed_only_fields[type][field] = fn(doc)
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42 index.indexed_only_fields = java_index.indexed_only_fields
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43
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44 index.to_string = java_index.to_string
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45 -- index.backup = java_index.backup
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46 index.snapshot = java_index.snapshot
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47 index.advanced_search = java_index.advanced_search
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48 index.search_in_transaction = java_index.search_in_transaction
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49 index.delete_all = java_index.delete_all
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50 index.delete = java_index.delete
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51 index.save = java_index.save
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52 index.update_in_transaction = java_index.update_in_transaction
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53 -- index.close = java_index.close
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54 index.ensure_open = java_index.ensure_open
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55 index.next_id = java_index.nextId
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56 index.highlighter = java_index.highlighter
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57
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58 M.instances[index] = true
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59
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60 function index.close()
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61 M.instances[index] = nil
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62 java_index.close()
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63 end
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64
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65 function index.search(query, from, to, sort)
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66 from or error "missing 'from' parameter"
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67 to or error "missing 'to' parameter"
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68 local results = {}
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69 local function fn(i,doc_fn)
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70 if i >= from then
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71 results[#results+1] = doc_fn()
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72 end
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73 end
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74 local total_hits = index.advanced_search(query,fn,to,sort)
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75 return results, total_hits
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76 end
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78 function index.get_document(query)
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79 local doc
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80 local function fn(_,doc_fn)
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81 doc = doc_fn()
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82 end
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83 local total_hits = index.advanced_search(query,fn,1)
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84 total_hits <= 1 or error( "found " .. total_hits .. " documents" )
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85 return doc
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86 end
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88 function index.count(query)
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89 return index.advanced_search(query)
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90 end
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91
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92 function index.html_highlighter(query,formatter,container_tags)
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93 local highlighter = index.highlighter(query,formatter)
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94 return function(html)
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95 local list = Html.parse(html,container_tags)
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96 local result = {}
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97 for _, obj in ipairs(list) do
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98 if type(obj) == "string" then
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99 obj = highlighter(obj)
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100 end
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101 result[#result+1] = obj
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102 end
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103 return Html.to_string(result)
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104 end
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105 end
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106
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107 function index.zip(zip_file)
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108 index.snapshot( function(dir_path,file_names)
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109 zip_file.delete()
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110 local zip_path = zip_file.canonical().to_string()
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111 local dir = uri("file:"..dir_path)
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112 local dir_name = dir.name()
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113 local options = {dir=dir.parent()}
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114 for _, file_name in ipairs(file_names) do
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115 local cmd = "zip "..zip_path.." "..dir_name.."/"..file_name
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116 Io.uri("os:"..cmd,options).read_text()
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117 end
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118 end )
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119 end
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120
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121 function index.restore(zip_file)
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122 java_index.run_in_lock( function()
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123 local lucene_dir = uri("file:"..index.dir)
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124 local before_restore = lucene_dir.parent().child("before_restore.zip")
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125 index.zip(before_restore)
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126 java_index.close()
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127 lucene_dir.delete()
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128 Io.uri("os:unzip "..zip_file.canonical().to_string(),{dir=lucene_dir.parent()}).read_text()
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129 java_index.reopen()
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130 end )
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131 end
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132
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133 local function multi_error()
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134 error "multiple lucene instances"
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135 end
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136
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137 if Rpc.functions.backup == nil then
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138
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139 function Rpc.functions.lucene_backup(password)
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140 Io.password == password or error "wrong password"
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141 local zip_file = uri("file:"..index.dir).parent().child("backup.zip")
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142 index.zip(zip_file)
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143 return zip_file
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144 end
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145
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146 function Rpc.functions.lucene_restore(password,zip_file)
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147 Io.password == password or error "wrong password"
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148 local backup_zip = uri("file:"..index.dir).parent().child("backup.zip")
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149 backup_zip.write(zip_file)
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150 index.restore(backup_zip)
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151 end
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152
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153 else
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154 Rpc.functions.lucene_backup = multi_error
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155 Rpc.functions.lucene_restore = multi_error
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156 end
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157
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158 return index
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159 end
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160
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161 return M