prosody
1c2c3d913172
core/storagemanager.lua

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core/storagemanager.lua @ 6949:1c2c3d913172

storagemanager: Split config retrieval into its own function
author Matthew Wild <mwild1@gmail.com>
date Thu, 03 Dec 2015 14:47:47 +0000
parent 6809:dd6b21862e3b
child 6951:99de8f30d99e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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2 local type, pairs = type, pairs;
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3 local setmetatable = setmetatable;
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4
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5 local config = require "core.configmanager";
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6 local datamanager = require "util.datamanager";
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7 local modulemanager = require "core.modulemanager";
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8 local multitable = require "util.multitable";
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9 local hosts = hosts;
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10 local log = require "util.logger".init("storagemanager");
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11
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12 local prosody = prosody;
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14 local _ENV = nil;
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16 local olddm = {}; -- maintain old datamanager, for backwards compatibility
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17 for k,v in pairs(datamanager) do olddm[k] = v; end
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19 local null_storage_method = function () return false, "no data storage active"; end
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20 local null_storage_driver = setmetatable(
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21 {
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22 name = "null",
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23 open = function (self) return self; end
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24 }, {
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25 __index = function (self, method) --luacheck: ignore 212
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26 return null_storage_method;
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27 end
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28 }
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29 );
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31 local stores_available = multitable.new();
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32
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33 local function initialize_host(host)
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34 local host_session = hosts[host];
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35 host_session.events.add_handler("item-added/storage-provider", function (event)
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36 local item = event.item;
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37 stores_available:set(host, item.name, item);
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38 end);
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39
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40 host_session.events.add_handler("item-removed/storage-provider", function (event)
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41 local item = event.item;
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42 stores_available:set(host, item.name, nil);
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43 end);
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44 end
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45 prosody.events.add_handler("host-activated", initialize_host, 101);
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46
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47 local function load_driver(host, driver_name)
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48 if driver_name == "null" then
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49 return null_storage_driver;
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50 end
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51 local driver = stores_available:get(host, driver_name);
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52 if driver then return driver; end
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53 local ok, err = modulemanager.load(host, "storage_"..driver_name);
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54 if not ok then
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55 log("error", "Failed to load storage driver plugin %s on %s: %s", driver_name, host, err);
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56 end
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57 return stores_available:get(host, driver_name);
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58 end
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59
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60 local function get_storage_config(host)
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61 return config.get(host, "storage");
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62 end
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63
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64 local function get_driver(host, store)
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65 local storage = get_storage_config(host);
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66 local driver_name;
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67 local option_type = type(storage);
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68 if option_type == "string" then
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69 driver_name = storage;
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70 elseif option_type == "table" then
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71 driver_name = storage[store];
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72 end
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73 if not driver_name then
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74 driver_name = config.get(host, "default_storage") or "internal";
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75 end
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76
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77 local driver = load_driver(host, driver_name);
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78 if not driver then
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79 log("warn", "Falling back to null driver for %s storage on %s", store, host);
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80 driver_name = "null";
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81 driver = null_storage_driver;
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82 end
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83 return driver, driver_name;
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84 end
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85
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86 local function open(host, store, typ)
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87 local driver, driver_name = get_driver(host, store);
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88 local ret, err = driver:open(store, typ);
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89 if not ret then
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90 if err == "unsupported-store" then
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91 log("debug", "Storage driver %s does not support store %s (%s), falling back to null driver",
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92 driver_name, store, typ or "<nil>");
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93 ret = null_storage_driver;
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94 err = nil;
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95 end
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96 end
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97 return ret, err;
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98 end
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99
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100 local function purge(user, host)
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101 local storage = get_storage_config(host);
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102 if type(storage) == "table" then
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103 -- multiple storage backends in use that we need to purge
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104 local purged = {};
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105 for store, driver_name in pairs(storage) do
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106 if not purged[driver_name] then
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107 local driver = get_driver(host, store);
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108 if driver.purge then
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109 purged[driver_name] = driver:purge(user);
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110 else
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111 log("warn", "Storage driver %s does not support removing all user data, you may need to delete it manually", driver_name);
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112 end
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113 end
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114 end
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115 end
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116 get_driver(host):purge(user); -- and the default driver
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117
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118 olddm.purge(user, host); -- COMPAT list stores, like offline messages end up in the old datamanager
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119
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120 return true;
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121 end
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122
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123 function datamanager.load(username, host, datastore)
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124 return open(host, datastore):get(username);
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125 end
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126 function datamanager.store(username, host, datastore, data)
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127 return open(host, datastore):set(username, data);
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128 end
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129 function datamanager.users(host, datastore, typ)
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130 local driver = open(host, datastore, typ);
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131 if not driver.users then
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132 return function() log("warn", "storage driver %s does not support listing users", driver.name) end
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133 end
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134 return driver:users();
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135 end
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136 function datamanager.stores(username, host, typ)
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137 return get_driver(host):stores(username, typ);
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138 end
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139 function datamanager.purge(username, host)
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140 return purge(username, host);
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141 end
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142
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143 return {
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144 initialize_host = initialize_host;
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145 load_driver = load_driver;
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146 get_driver = get_driver;
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147 open = open;
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148 purge = purge;
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149
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150 olddm = olddm;
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151 };