1 | <?php |
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2 | namespace Elgg\Cache; |
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3 | |||
4 | use Elgg\Database\Clauses\OrderByClause; |
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5 | use Elgg\Values; |
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6 | use ElggCache; |
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7 | use ElggMetadata; |
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8 | use Elgg\Database\Clauses\GroupByClause; |
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9 | |||
10 | /** |
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11 | * In memory cache of known metadata values stored by entity. |
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12 | * |
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13 | * @access private |
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14 | */ |
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15 | class MetadataCache { |
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16 | |||
17 | /** |
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18 | * @var ElggCache |
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19 | */ |
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20 | protected $cache; |
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21 | |||
22 | /** |
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23 | * Constructor |
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24 | * |
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25 | * @param ElggCache $cache Cache |
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26 | */ |
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27 | 5090 | public function __construct(ElggCache $cache) { |
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28 | 5090 | $this->cache = $cache; |
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29 | 5090 | } |
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30 | |||
31 | /** |
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32 | * Set the visible metadata for an entity in the cache |
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33 | * |
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34 | * Note this does NOT invalidate any other part of the cache. |
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35 | * |
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36 | * @param int $entity_guid The GUID of the entity |
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37 | * @param array $values The metadata values to cache |
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38 | * |
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39 | * @return void |
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40 | * |
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41 | * @interal For testing only |
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42 | */ |
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43 | 5 | public function inject($entity_guid, array $values = []) { |
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44 | 5 | $metadata = []; |
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45 | 5 | foreach ($values as $key => $value) { |
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46 | 5 | if ($value instanceof ElggMetadata) { |
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47 | $md = $value; |
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48 | } else { |
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49 | 5 | $md = new ElggMetadata(); |
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50 | 5 | $md->name = $key; |
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51 | 5 | $md->value = $value; |
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52 | 5 | $md->entity_guid = $entity_guid; |
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53 | } |
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54 | |||
55 | 5 | $metadata[] = $md->toObject(); |
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56 | } |
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57 | |||
58 | 5 | $this->cache->save($entity_guid, $metadata); |
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59 | 5 | } |
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60 | |||
61 | /** |
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62 | * Get all entity metadata |
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63 | * |
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64 | * @param int $entity_guid Entity guid |
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65 | * @return array |
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66 | */ |
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67 | 6211 | public function getAll($entity_guid) { |
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68 | 6211 | $metadata = $this->getEntityMetadata($entity_guid); |
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69 | 6211 | if (empty($metadata)) { |
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70 | 6077 | return []; |
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71 | } |
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72 | |||
73 | 1140 | $metadata_values = []; |
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74 | |||
75 | 1140 | foreach ($metadata as $md) { |
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76 | 1140 | $metadata_values[$md->name][] = $md->value; |
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77 | } |
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78 | |||
79 | 1140 | return array_map(function($values) { |
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80 | 1140 | return count($values) > 1 ? $values : $values[0]; |
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81 | 1140 | }, $metadata_values); |
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82 | } |
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83 | |||
84 | /** |
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85 | * Get the metadata for a particular name. Note, this can return an array of values. |
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86 | * |
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87 | * Warning: You should always call isLoaded() beforehand to verify that this |
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88 | * function's return value can be trusted. |
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89 | * |
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90 | * @see isLoaded |
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91 | * |
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92 | * @param int $entity_guid The GUID of the entity |
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93 | * @param string $name The metadata name |
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94 | * |
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95 | * @return array|string|int|null null = value does not exist |
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96 | */ |
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97 | 3 | public function getSingle($entity_guid, $name) { |
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98 | 3 | $metadata = $this->getEntityMetadata($entity_guid); |
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99 | 3 | if (empty($metadata)) { |
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100 | 1 | return null; |
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101 | } |
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102 | |||
103 | 3 | $values = []; |
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104 | |||
105 | 3 | foreach ($metadata as $md) { |
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106 | 3 | if ($md->name !== $name) { |
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107 | 3 | continue; |
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108 | } |
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109 | |||
110 | 3 | $values[] = $md->value; |
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111 | } |
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112 | |||
113 | 3 | if (empty($values)) { |
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114 | 1 | return null; |
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115 | } |
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116 | |||
117 | 3 | return count($values) > 1 ? $values : $values[0]; |
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118 | |||
119 | } |
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120 | |||
121 | /** |
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122 | * Get the metadata id for a particular name |
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123 | * |
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124 | * Warning: You should always call isLoaded() beforehand to verify that this |
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125 | * function's return value can be trusted. |
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126 | * |
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127 | * @see isLoaded |
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128 | * |
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129 | * @param int $entity_guid The GUID of the entity |
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130 | * @param string $name The metadata name |
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131 | * |
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132 | * @return int[]|int|null |
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133 | */ |
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134 | 1290 | public function getSingleId($entity_guid, $name) { |
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135 | 1290 | $metadata = $this->getEntityMetadata($entity_guid); |
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136 | 1290 | if (empty($metadata)) { |
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137 | 1290 | return null; |
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138 | } |
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139 | |||
140 | 874 | $ids = []; |
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141 | |||
142 | 874 | foreach ($metadata as $md) { |
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143 | 874 | if ($md->name !== $name) { |
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144 | 874 | continue; |
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145 | } |
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146 | |||
147 | 413 | $ids[] = $md->id; |
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148 | } |
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149 | |||
150 | 874 | if (empty($ids)) { |
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151 | 874 | return null; |
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152 | } |
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153 | |||
154 | 413 | return count($ids) > 1 ? $ids : $ids[0]; |
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155 | } |
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156 | |||
157 | /** |
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158 | * Forget about all metadata for an entity. |
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159 | * |
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160 | * @param int $entity_guid The GUID of the entity |
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161 | * |
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162 | * @return void |
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163 | */ |
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164 | 1295 | public function clear($entity_guid) { |
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165 | 1295 | $this->invalidateByOptions([ |
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166 | 1295 | 'guid' => $entity_guid, |
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167 | ]); |
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168 | 1295 | } |
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169 | |||
170 | /** |
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171 | * If true, getSingle() will return an accurate values from the DB |
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172 | * |
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173 | * @param int $entity_guid The GUID of the entity |
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174 | * |
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175 | * @return bool |
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176 | */ |
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177 | 1296 | public function isLoaded($entity_guid) { |
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178 | 1296 | return $this->cache->load($entity_guid) !== null; |
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179 | } |
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180 | |||
181 | /** |
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182 | * Clear entire cache |
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183 | * |
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184 | * @return void |
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185 | */ |
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186 | 9 | public function clearAll() { |
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187 | 9 | $this->invalidateByOptions([]); |
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188 | 9 | } |
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189 | |||
190 | /** |
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191 | * Returns loaded entity metadata |
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192 | * |
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193 | * @param int $entity_guid Entity guid |
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194 | * |
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195 | * @return \stdClass[]|null |
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196 | */ |
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197 | 6212 | public function getEntityMetadata($entity_guid) { |
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198 | 6212 | $entity_guid = (int) $entity_guid; |
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199 | 6212 | $metadata = $this->cache->load($entity_guid); |
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200 | 6212 | if ($metadata === null) { |
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201 | 6150 | $metadata = elgg_extract($entity_guid, $this->populateFromEntities($entity_guid)); |
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202 | } |
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203 | |||
204 | 6212 | return $metadata; |
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205 | } |
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206 | |||
207 | /** |
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208 | * Invalidate based on options passed to the global *_metadata functions |
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209 | * |
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210 | * @param array $options Options passed to elgg_(delete|disable|enable)_metadata |
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211 | * "guid" if given, invalidation will be limited to this entity |
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212 | * @return void |
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213 | */ |
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214 | 1325 | public function invalidateByOptions(array $options) { |
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215 | 1325 | if (empty($options['guid'])) { |
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216 | 9 | _elgg_services()->sessionCache->clear(); |
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217 | 9 | _elgg_services()->dataCache->clear(); |
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218 | } else { |
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219 | 1322 | _elgg_services()->entityTable->invalidateCache($options['guid']); |
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220 | } |
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221 | 1325 | } |
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222 | |||
223 | /** |
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224 | * Populate the cache from a set of entities |
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225 | * |
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226 | * @param int[] ...$guids Array of or single GUIDs |
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227 | * @return array|null [guid => [metadata]] |
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228 | */ |
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229 | 6211 | public function populateFromEntities(...$guids) { |
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230 | try { |
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231 | 6211 | $guids = Values::normalizeGuids($guids); |
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232 | } catch (\DataFormatException $e) { |
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233 | return null; |
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234 | } |
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235 | |||
236 | 6211 | if (empty($guids)) { |
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237 | 27 | return null; |
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238 | } |
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239 | |||
240 | 6211 | $version = (int) _elgg_config()->version; |
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241 | 6211 | if (!empty($version) && ($version < 2016110900)) { |
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242 | // can't use this during upgrade from 2.x to 3.0 |
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243 | return null; |
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244 | } |
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245 | |||
246 | 6211 | $cached_values = []; |
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247 | |||
248 | 6211 | foreach ($guids as $i => $guid) { |
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249 | 6211 | $value = $this->cache->load($guid); |
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250 | 6211 | if ($value !== null) { |
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251 | 418 | $cached_values[$guid] = $value; |
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252 | 6211 | unset($guids[$i]); |
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253 | } |
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254 | } |
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255 | |||
256 | 6211 | if (empty($guids)) { |
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257 | 417 | return $cached_values; |
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258 | } |
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259 | |||
260 | // could be useful at some point in future |
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261 | //$guids = $this->filterMetadataHeavyEntities($guids); |
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262 | |||
263 | $options = [ |
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264 | 6211 | 'guids' => $guids, |
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265 | 6211 | 'limit' => 0, |
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266 | 'callback' => false, |
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267 | 'distinct' => false, |
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268 | 'order_by' => [ |
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269 | 6211 | new OrderByClause('n_table.entity_guid', 'asc'), |
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270 | 6211 | new OrderByClause('n_table.time_created', 'asc'), |
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271 | 6211 | new OrderByClause('n_table.id', 'asc') |
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272 | ], |
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273 | ]; |
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274 | |||
275 | // We already have a loaded entity, so we can ignore entity access clauses |
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276 | 6211 | $ia = _elgg_services()->session->setIgnoreAccess(true); |
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277 | 6211 | $data = _elgg_services()->metadataTable->getAll($options); |
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278 | 6211 | _elgg_services()->session->setIgnoreAccess($ia); |
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279 | |||
280 | 6211 | $values = []; |
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281 | |||
282 | 6211 | foreach ($data as $i => $row) { |
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283 | 1139 | $row->value = ($row->value_type === 'text') ? $row->value : (int) $row->value; |
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284 | 1139 | $values[$row->entity_guid][] = $row; |
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285 | } |
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286 | |||
287 | // store always for every guid, even if there is no metadata |
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288 | 6211 | foreach ($guids as $guid) { |
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289 | 6211 | $metadata = elgg_extract($guid, $values, []); |
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290 | |||
291 | 6211 | $this->cache->save($guid, $metadata); |
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292 | 6211 | $cached_values[$guid] = $metadata; |
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293 | } |
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294 | |||
295 | 6211 | return $cached_values; |
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296 | } |
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297 | |||
298 | /** |
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299 | * Filter out entities whose concatenated metadata values (INTs casted as string) |
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300 | * exceed a threshold in characters. This could be used to avoid overpopulating the |
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301 | * cache if RAM usage becomes an issue. |
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302 | * |
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303 | * @param array $guids GUIDs of entities to examine |
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304 | * @param int $limit Limit in characters of all metadata (with ints casted to strings) |
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305 | * |
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306 | * @return array |
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307 | */ |
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308 | 1 | public function filterMetadataHeavyEntities(array $guids, $limit = 1024000) { |
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309 | |||
310 | 1 | $guids = _elgg_services()->metadataTable->getAll([ |
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311 | 1 | 'guids' => $guids, |
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312 | 1 | 'limit' => 0, |
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313 | 1 | 'callback' => function($e) { |
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314 | 1 | return (int) $e->entity_guid; |
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315 | 1 | }, |
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316 | 'selects' => ['SUM(LENGTH(n_table.value)) AS bytes'], |
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317 | 'order_by' => [ |
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318 | 1 | new OrderByClause('n_table.entity_guid'), |
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319 | 1 | new OrderByClause('n_table.time_created'), |
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320 | ], |
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321 | 'group_by' => [ |
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322 | 1 | new GroupByClause('n_table.entity_guid'), |
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323 | ], |
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324 | 'having' => [ |
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325 | 1 | "bytes < $limit", |
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326 | ] |
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327 | ]); |
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328 | |||
329 | 1 | return $guids ? : []; |
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330 | } |
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331 | } |
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332 |