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8b284787fe26
core/storagemanager.lua

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core/storagemanager.lua @ 6792:8b284787fe26

storagemanager: Add forward declaration to fix use of open() before it's defined
author Kim Alvefur <zash@zash.se>
date Thu, 20 Aug 2015 23:57:22 +0200
parent 6791:e813e8cf6046
child 6811:82350a06df6e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1
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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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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_driver(host, store)
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61 local storage = config.get(host, "storage");
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62 local driver_name;
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63 local option_type = type(storage);
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64 if option_type == "string" then
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65 driver_name = storage;
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66 elseif option_type == "table" then
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67 driver_name = storage[store];
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68 end
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69 if not driver_name then
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70 driver_name = config.get(host, "default_storage") or "internal";
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71 end
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72
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73 local driver = load_driver(host, driver_name);
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74 if not driver then
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75 log("warn", "Falling back to null driver for %s storage on %s", store, host);
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76 driver_name = "null";
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77 driver = null_storage_driver;
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78 end
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79 return driver, driver_name;
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80 end
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81
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82 local map_shim_mt = {
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83 __index = {
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84 get = function(self, username, key)
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85 local ret, err = self.keyval_store:get(username);
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86 if ret == nil then return nil, err end
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87 return ret[key];
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88 end;
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89 set = function(self, username, key, data)
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90 local current, err = self.keyval_store:get(username);
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91 if current == nil then
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92 if err then
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93 return nil, err;
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94 else
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95 current = {};
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96 end
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97 end
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98 current[key] = data;
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99 return self.keyval_store:set(username, current);
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100 end;
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101 };
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102 }
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103
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104 local open; -- forward declaration
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105
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106 local function create_map_shim(host, store)
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107 local keyval_store, err = open(host, store, "keyval");
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108 if keyval_store == nil then return nil, err end
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109 return setmetatable({
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110 keyval_store = keyval_store;
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111 }, map_shim_mt);
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112 end
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113
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114 function open(host, store, typ)
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115 local driver, driver_name = get_driver(host, store);
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parents: 3403
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116 local ret, err = driver:open(store, typ);
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117 if not ret then
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parents: 3403
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118 if err == "unsupported-store" then
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daurnimator <quae@daurnimator.com>
parents: 5776
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119 if typ == "map" then -- Use shim on top of keyval store
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parents: 5776
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120 log("debug", "map storage driver unavailable, using shim on top of keyval store.");
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121 return create_map_shim(host, store);
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parents: 5776
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122 end
4011
0df6b99cb74a storagemanager: Fix log message (s/internal/null/)
Matthew Wild <mwild1@gmail.com>
parents: 4010
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123 log("debug", "Storage driver %s does not support store %s (%s), falling back to null driver",
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c773aa4467f1 storagemanager: Fix traceback in logging when store type is nil, and store is unsupported.
Waqas Hussain <waqas20@gmail.com>
parents: 5155
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124 driver_name, store, typ or "<nil>");
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21311bd31f6b storagemanager: Add new "null" provider to get used when loading a driver or opening a store fails, instead of falling back to the default driver
Matthew Wild <mwild1@gmail.com>
parents: 4009
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125 ret = null_storage_driver;
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parents: 3403
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126 err = nil;
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parents: 3403
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127 end
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128 end
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parents: 3403
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129 return ret, err;
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130 end
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131
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parents: 6663
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132 local function purge(user, host)
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0cd962661fa2 storagemanager: Remove usage of 'core' when calling configmanager.get()
Matthew Wild <mwild1@gmail.com>
parents: 5130
diff changeset
133 local storage = config.get(host, "storage");
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Kim Alvefur <zash@zash.se>
parents: 5111
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134 if type(storage) == "table" then
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parents: 5111
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135 -- multiple storage backends in use that we need to purge
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136 local purged = {};
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parents: 5111
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137 for store, driver in pairs(storage) do
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parents: 5111
diff changeset
138 if not purged[driver] then
e8253c931166 storagemanager: Add purge() for purging user data from all backends in use
Kim Alvefur <zash@zash.se>
parents: 5111
diff changeset
139 purged[driver] = get_driver(host, store):purge(user);
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parents: 5111
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140 end
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Kim Alvefur <zash@zash.se>
parents: 5111
diff changeset
141 end
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Kim Alvefur <zash@zash.se>
parents: 5111
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142 end
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Kim Alvefur <zash@zash.se>
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143 get_driver(host):purge(user); -- and the default driver
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144
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Kim Alvefur <zash@zash.se>
parents: 5111
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145 olddm.purge(user, host); -- COMPAT list stores, like offline messages end up in the old datamanager
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146
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Kim Alvefur <zash@zash.se>
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diff changeset
147 return true;
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parents: 5111
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148 end
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Kim Alvefur <zash@zash.se>
parents: 5111
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149
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150 function datamanager.load(username, host, datastore)
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151 return open(host, datastore):get(username);
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152 end
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parents:
diff changeset
153 function datamanager.store(username, host, datastore, data)
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154 return open(host, datastore):set(username, data);
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155 end
5155
a207d4bff5a4 storagemanager: Support for iterating over users
Kim Alvefur <zash@zash.se>
parents: 5137
diff changeset
156 function datamanager.users(host, datastore, typ)
a207d4bff5a4 storagemanager: Support for iterating over users
Kim Alvefur <zash@zash.se>
parents: 5137
diff changeset
157 local driver = open(host, datastore, typ);
a207d4bff5a4 storagemanager: Support for iterating over users
Kim Alvefur <zash@zash.se>
parents: 5137
diff changeset
158 if not driver.users then
a207d4bff5a4 storagemanager: Support for iterating over users
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parents: 5137
diff changeset
159 return function() log("warn", "storage driver %s does not support listing users", driver.name) end
a207d4bff5a4 storagemanager: Support for iterating over users
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diff changeset
160 end
a207d4bff5a4 storagemanager: Support for iterating over users
Kim Alvefur <zash@zash.se>
parents: 5137
diff changeset
161 return driver:users();
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parents: 5137
diff changeset
162 end
5130
051d352ed03c storagemanager, datamanager, mod_storage_{internal,sql}: Replace list_stores() with an iterator version
Kim Alvefur <zash@zash.se>
parents: 5129
diff changeset
163 function datamanager.stores(username, host, typ)
051d352ed03c storagemanager, datamanager, mod_storage_{internal,sql}: Replace list_stores() with an iterator version
Kim Alvefur <zash@zash.se>
parents: 5129
diff changeset
164 return get_driver(host):stores(username, typ);
5037
c34fdcae6d29 storagemanager: Add method for listing stores
Kim Alvefur <zash@zash.se>
parents: 5036
diff changeset
165 end
5041
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Kim Alvefur <zash@zash.se>
parents: 5037
diff changeset
166 function datamanager.purge(username, host)
5136
77ea38607a89 storagemanager: Fix argument (Thanks Maranda)
Kim Alvefur <zash@zash.se>
parents: 5133
diff changeset
167 return purge(username, host);
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Kim Alvefur <zash@zash.se>
parents: 5037
diff changeset
168 end
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169
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parents: 6663
diff changeset
170 return {
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Kim Alvefur <zash@zash.se>
parents: 6663
diff changeset
171 initialize_host = initialize_host;
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Kim Alvefur <zash@zash.se>
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diff changeset
172 load_driver = load_driver;
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diff changeset
173 get_driver = get_driver;
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diff changeset
174 open = open;
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diff changeset
175
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Kim Alvefur <zash@zash.se>
parents: 6663
diff changeset
176 olddm = olddm;
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Kim Alvefur <zash@zash.se>
parents: 6663
diff changeset
177 };