1 | <?php |
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2 | /*********************************************** |
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3 | * File : statemanager.php |
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4 | * Project : Z-Push |
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5 | * Descr : The StateManager uses a IStateMachine |
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6 | * implementation to save data. |
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7 | * SyncKey's are of the form {UUID}N, in |
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8 | * which UUID is allocated during the |
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9 | * first sync, and N is incremented |
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10 | * for each request to 'GetNewSyncKey()'. |
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11 | * A sync state is simple an opaque |
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12 | * string value that can differ |
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13 | * for each backend used - normally |
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14 | * a list of items as the backend has |
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15 | * sent them to the PIM. The backend |
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16 | * can then use this backend |
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17 | * information to compute the increments |
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18 | * with current data. |
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19 | * See FileStateMachine and IStateMachine |
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20 | * for additional information. |
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21 | * |
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22 | * Created : 26.12.2011 |
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23 | * |
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24 | * Copyright 2007 - 2012 Zarafa Deutschland GmbH |
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25 | * |
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26 | * This program is free software: you can redistribute it and/or modify |
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27 | * it under the terms of the GNU Affero General Public License, version 3, |
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28 | * as published by the Free Software Foundation with the following additional |
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29 | * term according to sec. 7: |
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30 | * |
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31 | * According to sec. 7 of the GNU Affero General Public License, version 3, |
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32 | * the terms of the AGPL are supplemented with the following terms: |
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33 | * |
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34 | * "Zarafa" is a registered trademark of Zarafa B.V. |
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35 | * "Z-Push" is a registered trademark of Zarafa Deutschland GmbH |
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36 | * The licensing of the Program under the AGPL does not imply a trademark license. |
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37 | * Therefore any rights, title and interest in our trademarks remain entirely with us. |
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38 | * |
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39 | * However, if you propagate an unmodified version of the Program you are |
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40 | * allowed to use the term "Z-Push" to indicate that you distribute the Program. |
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41 | * Furthermore you may use our trademarks where it is necessary to indicate |
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42 | * the intended purpose of a product or service provided you use it in accordance |
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43 | * with honest practices in industrial or commercial matters. |
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44 | * If you want to propagate modified versions of the Program under the name "Z-Push", |
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45 | * you may only do so if you have a written permission by Zarafa Deutschland GmbH |
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46 | * (to acquire a permission please contact Zarafa at trademark@zarafa.com). |
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47 | * |
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48 | * This program is distributed in the hope that it will be useful, |
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49 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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50 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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51 | * GNU Affero General Public License for more details. |
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52 | * |
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53 | * You should have received a copy of the GNU Affero General Public License |
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54 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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55 | * |
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56 | * Consult LICENSE file for details |
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57 | ************************************************/ |
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58 | |
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59 | class StateManager { |
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60 | const FIXEDHIERARCHYCOUNTER = 99999; |
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61 | |
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62 | // backend storage types |
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63 | const BACKENDSTORAGE_PERMANENT = 1; |
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64 | const BACKENDSTORAGE_STATE = 2; |
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65 | |
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66 | private $statemachine; |
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67 | private $device; |
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68 | private $hierarchyOperation = false; |
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69 | private $deleteOldStates = false; |
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70 | |
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71 | private $foldertype; |
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72 | private $uuid; |
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73 | private $oldStateCounter; |
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74 | private $newStateCounter; |
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75 | private $synchedFolders; |
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76 | |
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77 | |
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78 | /** |
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79 | * Constructor |
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80 | * |
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81 | * @access public |
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82 | */ |
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83 | public function StateManager() { |
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84 | $this->statemachine = ZPush::GetStateMachine(); |
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85 | $this->hierarchyOperation = ZPush::HierarchyCommand(Request::GetCommandCode()); |
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86 | $this->deleteOldStates = (Request::GetCommandCode() === ZPush::COMMAND_SYNC || $this->hierarchyOperation); |
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87 | $this->synchedFolders = array(); |
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88 | } |
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89 | |
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90 | /** |
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91 | * Sets an ASDevice for the Statemanager to work with |
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92 | * |
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93 | * @param ASDevice $device |
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94 | * |
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95 | * @access public |
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96 | * @return boolean |
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97 | */ |
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98 | public function SetDevice(&$device) { |
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99 | $this->device = $device; |
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100 | return true; |
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101 | } |
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102 | |
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103 | /** |
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104 | * Returns an array will all synchronized folderids |
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105 | * |
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106 | * @access public |
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107 | * @return array |
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108 | */ |
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109 | public function GetSynchedFolders() { |
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110 | $synched = array(); |
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111 | foreach ($this->device->GetAllFolderIds() as $folderid) { |
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112 | $uuid = $this->device->GetFolderUUID($folderid); |
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113 | if ($uuid) |
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114 | $synched[] = $folderid; |
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115 | } |
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116 | return $synched; |
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117 | } |
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118 | |
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119 | /** |
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120 | * Returns a folder state (SyncParameters) for a folder id |
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121 | * |
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122 | * @param $folderid |
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123 | * |
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124 | * @access public |
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125 | * @return SyncParameters |
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126 | */ |
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127 | public function GetSynchedFolderState($folderid) { |
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128 | // new SyncParameters are cached |
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129 | if (isset($this->synchedFolders[$folderid])) |
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130 | return $this->synchedFolders[$folderid]; |
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131 | |
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132 | $uuid = $this->device->GetFolderUUID($folderid); |
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133 | if ($uuid) { |
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134 | try { |
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135 | $data = $this->statemachine->GetState($this->device->GetDeviceId(), IStateMachine::FOLDERDATA, $uuid); |
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136 | if ($data !== false) { |
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137 | $this->synchedFolders[$folderid] = $data; |
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138 | } |
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139 | } |
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140 | catch (StateNotFoundException $ex) { } |
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141 | } |
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142 | |
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143 | if (!isset($this->synchedFolders[$folderid])) |
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144 | $this->synchedFolders[$folderid] = new SyncParameters(); |
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145 | |
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146 | return $this->synchedFolders[$folderid]; |
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147 | } |
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148 | |
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149 | /** |
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150 | * Saves a folder state - SyncParameters object |
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151 | * |
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152 | * @param SyncParamerters $spa |
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153 | * |
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154 | * @access public |
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155 | * @return boolean |
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156 | */ |
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157 | public function SetSynchedFolderState($spa) { |
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158 | // make sure the current uuid is linked on the device for the folder. |
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159 | // if not, old states will be automatically removed and the new ones linked |
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160 | self::LinkState($this->device, $spa->GetUuid(), $spa->GetFolderId()); |
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161 | |
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162 | $spa->SetReferencePolicyKey($this->device->GetPolicyKey()); |
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163 | |
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164 | return $this->statemachine->SetState($spa, $this->device->GetDeviceId(), IStateMachine::FOLDERDATA, $spa->GetUuid()); |
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165 | } |
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166 | |
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167 | /** |
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168 | * Gets the new sync key for a specified sync key. The new sync state must be |
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169 | * associated to this sync key when calling SetSyncState() |
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170 | * |
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171 | * @param string $synckey |
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172 | * |
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173 | * @access public |
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174 | * @return string |
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175 | */ |
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176 | function GetNewSyncKey($synckey) { |
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177 | if(!isset($synckey) || $synckey == "0" || $synckey == false) { |
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178 | $this->uuid = $this->getNewUuid(); |
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179 | $this->newStateCounter = 1; |
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180 | } |
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181 | else { |
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182 | list($uuid, $counter) = self::ParseStateKey($synckey); |
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183 | $this->uuid = $uuid; |
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184 | $this->newStateCounter = $counter + 1; |
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185 | } |
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186 | |
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187 | return self::BuildStateKey($this->uuid, $this->newStateCounter); |
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188 | } |
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189 | |
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190 | /** |
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191 | * Gets the state for a specified synckey (uuid + counter) |
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192 | * |
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193 | * @param string $synckey |
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194 | * |
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195 | * @access public |
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196 | * @return string |
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197 | * @throws StateInvalidException, StateNotFoundException |
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198 | */ |
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199 | public function GetSyncState($synckey) { |
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200 | // No sync state for sync key '0' |
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201 | if($synckey == "0") { |
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202 | $this->oldStateCounter = 0; |
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203 | return ""; |
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204 | } |
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205 | |
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206 | // Check if synckey is allowed and set uuid and counter |
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207 | list($this->uuid, $this->oldStateCounter) = self::ParseStateKey($synckey); |
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208 | |
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209 | // make sure the hierarchy cache is in place |
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210 | if ($this->hierarchyOperation) |
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211 | $this->loadHierarchyCache(); |
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212 | |
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213 | // the state machine will discard any sync states before this one, as they are no longer required |
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214 | return $this->statemachine->GetState($this->device->GetDeviceId(), IStateMachine::DEFTYPE, $this->uuid, $this->oldStateCounter, $this->deleteOldStates); |
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215 | } |
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216 | |
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217 | /** |
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218 | * Writes the sync state to a new synckey |
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219 | * |
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220 | * @param string $synckey |
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221 | * @param string $syncstate |
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222 | * @param string $folderid (opt) the synckey is associated with the folder - should always be set when performing CONTENT operations |
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223 | * |
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224 | * @access public |
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225 | * @return boolean |
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226 | * @throws StateInvalidException |
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227 | */ |
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228 | public function SetSyncState($synckey, $syncstate, $folderid = false) { |
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229 | $internalkey = self::BuildStateKey($this->uuid, $this->newStateCounter); |
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230 | if ($this->oldStateCounter != 0 && $synckey != $internalkey) |
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231 | throw new StateInvalidException(sprintf("Unexpected synckey value oldcounter: '%s' synckey: '%s' internal key: '%s'", $this->oldStateCounter, $synckey, $internalkey)); |
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232 | |
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233 | // make sure the hierarchy cache is also saved |
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234 | if ($this->hierarchyOperation) |
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235 | $this->saveHierarchyCache(); |
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236 | |
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237 | // announce this uuid to the device, while old uuid/states should be deleted |
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238 | self::LinkState($this->device, $this->uuid, $folderid); |
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239 | |
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240 | return $this->statemachine->SetState($syncstate, $this->device->GetDeviceId(), IStateMachine::DEFTYPE, $this->uuid, $this->newStateCounter); |
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241 | } |
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242 | |
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243 | /** |
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244 | * Gets the failsave sync state for the current synckey |
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245 | * |
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246 | * @access public |
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247 | * @return array/boolean false if not available |
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248 | */ |
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249 | public function GetSyncFailState() { |
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250 | if (!$this->uuid) |
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251 | return false; |
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252 | |
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253 | try { |
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254 | return $this->statemachine->GetState($this->device->GetDeviceId(), IStateMachine::FAILSAVE, $this->uuid, $this->oldStateCounter, $this->deleteOldStates); |
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255 | } |
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256 | catch (StateNotFoundException $snfex) { |
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257 | return false; |
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258 | } |
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259 | } |
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260 | |
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261 | /** |
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262 | * Writes the failsave sync state for the current (old) synckey |
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263 | * |
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264 | * @param mixed $syncstate |
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265 | * |
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266 | * @access public |
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267 | * @return boolean |
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268 | */ |
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269 | public function SetSyncFailState($syncstate) { |
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270 | if ($this->oldStateCounter == 0) |
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271 | return false; |
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272 | |
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273 | return $this->statemachine->SetState($syncstate, $this->device->GetDeviceId(), IStateMachine::FAILSAVE, $this->uuid, $this->oldStateCounter); |
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274 | } |
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275 | |
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276 | /** |
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277 | * Gets the backendstorage data |
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278 | * |
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279 | * @param int $type permanent or state related storage |
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280 | * |
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281 | * @access public |
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282 | * @return mixed |
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283 | * @throws StateNotYetAvailableException, StateNotFoundException |
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284 | */ |
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285 | public function GetBackendStorage($type = self::BACKENDSTORAGE_PERMANENT) { |
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286 | if ($type == self::BACKENDSTORAGE_STATE) { |
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287 | if (!$this->uuid) |
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288 | throw new StateNotYetAvailableException(); |
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289 | |
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290 | return $this->statemachine->GetState($this->device->GetDeviceId(), IStateMachine::BACKENDSTORAGE, $this->uuid, $this->oldStateCounter, $this->deleteOldStates); |
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291 | } |
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292 | else { |
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293 | return $this->statemachine->GetState($this->device->GetDeviceId(), IStateMachine::BACKENDSTORAGE, false, $this->device->GetFirstSyncTime()); |
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294 | } |
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295 | } |
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296 | |
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297 | /** |
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298 | * Writes the backendstorage data |
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299 | * |
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300 | * @param mixed $data |
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301 | * @param int $type permanent or state related storage |
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302 | * |
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303 | * @access public |
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304 | * @return int amount of bytes saved |
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305 | * @throws StateNotYetAvailableException, StateNotFoundException |
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306 | */ |
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307 | public function SetBackendStorage($data, $type = self::BACKENDSTORAGE_PERMANENT) { |
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308 | if ($type == self::BACKENDSTORAGE_STATE) { |
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309 | if (!$this->uuid) |
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310 | throw new StateNotYetAvailableException(); |
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311 | |
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312 | // TODO serialization should be done in the StateMachine |
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313 | return $this->statemachine->SetState($data, $this->device->GetDeviceId(), IStateMachine::BACKENDSTORAGE, $this->uuid, $this->newStateCounter); |
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314 | } |
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315 | else { |
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316 | return $this->statemachine->SetState($data, $this->device->GetDeviceId(), IStateMachine::BACKENDSTORAGE, false, $this->device->GetFirstSyncTime()); |
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317 | } |
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318 | } |
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319 | |
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320 | /** |
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321 | * Initializes the HierarchyCache for legacy syncs |
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322 | * this is for AS 1.0 compatibility: |
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323 | * save folder information synched with GetHierarchy() |
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324 | * handled by StateManager |
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325 | * |
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326 | * @param string $folders Array with folder information |
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327 | * |
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328 | * @access public |
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329 | * @return boolean |
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330 | */ |
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331 | public function InitializeFolderCache($folders) { |
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332 | if (!is_array($folders)) |
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333 | return false; |
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334 | |
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335 | if (!isset($this->device)) |
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336 | throw new FatalException("ASDevice not initialized"); |
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337 | |
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338 | // redeclare this operation as hierarchyOperation |
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339 | $this->hierarchyOperation = true; |
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340 | |
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341 | // as there is no hierarchy uuid, we have to create one |
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342 | $this->uuid = $this->getNewUuid(); |
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343 | $this->newStateCounter = self::FIXEDHIERARCHYCOUNTER; |
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344 | |
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345 | // initialize legacy HierarchCache |
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346 | $this->device->SetHierarchyCache($folders); |
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347 | |
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348 | // force saving the hierarchy cache! |
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349 | return $this->saveHierarchyCache(true); |
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350 | } |
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351 | |
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352 | |
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353 | /**---------------------------------------------------------------------------------------------------------- |
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354 | * static StateManager methods |
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355 | */ |
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356 | |
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357 | /** |
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358 | * Links a folderid to the a UUID |
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359 | * Old states are removed if an folderid is linked to a new UUID |
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360 | * assisting the StateMachine to get rid of old data. |
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361 | * |
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362 | * @param ASDevice $device |
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363 | * @param string $uuid the uuid to link to |
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364 | * @param string $folderid (opt) if not set, hierarchy state is linked |
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365 | * |
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366 | * @access public |
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367 | * @return boolean |
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368 | */ |
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369 | static public function LinkState(&$device, $newUuid, $folderid = false) { |
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370 | $savedUuid = $device->GetFolderUUID($folderid); |
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371 | // delete 'old' states! |
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372 | if ($savedUuid != $newUuid) { |
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373 | // remove states but no need to notify device |
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374 | self::UnLinkState($device, $folderid, false); |
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375 | |
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376 | ZLog::Write(LOGLEVEL_DEBUG, sprintf("StateManager::linkState(#ASDevice, '%s','%s'): linked to uuid '%s'.", $newUuid, (($folderid === false)?'HierarchyCache':$folderid), $newUuid)); |
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377 | return $device->SetFolderUUID($newUuid, $folderid); |
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378 | } |
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379 | return true; |
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380 | } |
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381 | |
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382 | /** |
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383 | * UnLinks all states from a folder id |
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384 | * Old states are removed assisting the StateMachine to get rid of old data. |
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385 | * The UUID is then removed from the device |
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386 | * |
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387 | * @param ASDevice $device |
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388 | * @param string $folderid |
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389 | * @param boolean $removeFromDevice indicates if the device should be |
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390 | * notified that the state was removed |
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391 | * @param boolean $retrieveUUIDFromDevice indicates if the UUID should be retrieved from |
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392 | * device. If not true this parameter will be used as UUID. |
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393 | * |
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394 | * @access public |
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395 | * @return boolean |
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396 | */ |
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397 | static public function UnLinkState(&$device, $folderid, $removeFromDevice = true, $retrieveUUIDFromDevice = true) { |
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398 | if ($retrieveUUIDFromDevice === true) |
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399 | $savedUuid = $device->GetFolderUUID($folderid); |
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400 | else |
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401 | $savedUuid = $retrieveUUIDFromDevice; |
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402 | |
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403 | if ($savedUuid) { |
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404 | ZLog::Write(LOGLEVEL_DEBUG, sprintf("StateManager::UnLinkState('%s'): saved state '%s' will be deleted.", $folderid, $savedUuid)); |
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405 | ZPush::GetStateMachine()->CleanStates($device->GetDeviceId(), IStateMachine::DEFTYPE, $savedUuid, self::FIXEDHIERARCHYCOUNTER *2); |
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406 | ZPush::GetStateMachine()->CleanStates($device->GetDeviceId(), IStateMachine::FOLDERDATA, $savedUuid); // CPO |
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407 | ZPush::GetStateMachine()->CleanStates($device->GetDeviceId(), IStateMachine::FAILSAVE, $savedUuid, self::FIXEDHIERARCHYCOUNTER *2); |
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408 | ZPush::GetStateMachine()->CleanStates($device->GetDeviceId(), IStateMachine::BACKENDSTORAGE, $savedUuid, self::FIXEDHIERARCHYCOUNTER *2); |
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409 | |
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410 | // remove all messages which could not be synched before |
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411 | $device->RemoveIgnoredMessage($folderid, false); |
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412 | |
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413 | if ($folderid === false && $savedUuid !== false) |
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414 | ZPush::GetStateMachine()->CleanStates($device->GetDeviceId(), IStateMachine::HIERARCHY, $savedUuid, self::FIXEDHIERARCHYCOUNTER *2); |
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415 | } |
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416 | // delete this id from the uuid cache |
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417 | if ($removeFromDevice) |
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418 | return $device->SetFolderUUID(false, $folderid); |
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419 | else |
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420 | return true; |
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421 | } |
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422 | |
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423 | /** |
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424 | * Parses a SyncKey and returns UUID and counter |
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425 | * |
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426 | * @param string $synckey |
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427 | * |
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428 | * @access public |
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429 | * @return array uuid, counter |
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430 | * @throws StateInvalidException |
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431 | */ |
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432 | static public function ParseStateKey($synckey) { |
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433 | $matches = array(); |
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434 | if(!preg_match('/^\{([0-9A-Za-z-]+)\}([0-9]+)$/', $synckey, $matches)) |
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435 | throw new StateInvalidException(sprintf("SyncKey '%s' is invalid", $synckey)); |
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436 | |
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437 | return array($matches[1], (int)$matches[2]); |
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438 | } |
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439 | |
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440 | /** |
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441 | * Builds a SyncKey from a UUID and counter |
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442 | * |
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443 | * @param string $uuid |
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444 | * @param int $counter |
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445 | * |
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446 | * @access public |
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447 | * @return string syncKey |
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448 | * @throws StateInvalidException |
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449 | */ |
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450 | static public function BuildStateKey($uuid, $counter) { |
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451 | if(!preg_match('/^([0-9A-Za-z-]+)$/', $uuid, $matches)) |
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452 | throw new StateInvalidException(sprintf("UUID '%s' is invalid", $uuid)); |
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453 | |
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454 | return "{" . $uuid . "}" . $counter; |
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455 | } |
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456 | |
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457 | |
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458 | /**---------------------------------------------------------------------------------------------------------- |
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459 | * private StateManager methods |
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460 | */ |
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461 | |
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462 | /** |
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463 | * Loads the HierarchyCacheState and initializes the HierarchyChache |
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464 | * if this is an hierarchy operation |
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465 | * |
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466 | * @access private |
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467 | * @return boolean |
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468 | * @throws StateNotFoundException |
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469 | */ |
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470 | private function loadHierarchyCache() { |
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471 | if (!$this->hierarchyOperation) |
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472 | return false; |
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473 | |
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474 | ZLog::Write(LOGLEVEL_DEBUG, sprintf("StateManager->loadHierarchyCache(): '%s-%s-%s-%d'", $this->device->GetDeviceId(), $this->uuid, IStateMachine::HIERARCHY, $this->oldStateCounter)); |
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475 | |
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476 | // check if a full hierarchy sync might be necessary |
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477 | if ($this->device->GetFolderUUID(false) === false) { |
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478 | self::UnLinkState($this->device, false, false, $this->uuid); |
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479 | throw new StateNotFoundException("No hierarchy UUID linked to device. Requesting folder resync."); |
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480 | } |
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481 | |
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482 | $hierarchydata = $this->statemachine->GetState($this->device->GetDeviceId(), IStateMachine::HIERARCHY, $this->uuid , $this->oldStateCounter, $this->deleteOldStates); |
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483 | $this->device->SetHierarchyCache($hierarchydata); |
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484 | return true; |
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485 | } |
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486 | |
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487 | /** |
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488 | * Saves the HierarchyCacheState of the HierarchyChache |
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489 | * if this is an hierarchy operation |
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490 | * |
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491 | * @param boolean $forceLoad indicates if the cache should be saved also if not a hierary operation |
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492 | * |
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493 | * @access private |
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494 | * @return boolean |
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495 | * @throws StateInvalidException |
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496 | */ |
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497 | private function saveHierarchyCache($forceSaving = false) { |
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498 | if (!$this->hierarchyOperation && !$forceSaving) |
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499 | return false; |
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500 | |
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501 | // link the hierarchy cache again, if the UUID does not match the UUID saved in the devicedata |
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502 | if (($this->uuid != $this->device->GetFolderUUID() || $forceSaving) ) |
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503 | self::LinkState($this->device, $this->uuid); |
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504 | |
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505 | // check all folders and deleted folders to update data of ASDevice and delete old states |
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506 | $hc = $this->device->getHierarchyCache(); |
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507 | foreach ($hc->GetDeletedFolders() as $delfolder) |
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508 | self::UnLinkState($this->device, $delfolder->serverid); |
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509 | |
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510 | foreach ($hc->ExportFolders() as $folder) |
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511 | $this->device->SetFolderType($folder->serverid, $folder->type); |
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512 | |
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513 | return $this->statemachine->SetState($this->device->GetHierarchyCacheData(), $this->device->GetDeviceId(), IStateMachine::HIERARCHY, $this->uuid, $this->newStateCounter); |
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514 | } |
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515 | |
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516 | /** |
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517 | * Generates a new UUID |
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518 | * |
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519 | * @access private |
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520 | * @return string |
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521 | */ |
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522 | private function getNewUuid() { |
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523 | return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x', |
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524 | mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), |
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525 | mt_rand( 0, 0x0fff ) | 0x4000, |
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526 | mt_rand( 0, 0x3fff ) | 0x8000, |
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527 | mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ) ); |
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528 | } |
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529 | } |
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530 | ?> |
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