prosody
246ba539a5cd
core/storagemanager.lua

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core/storagemanager.lua @ 5059:246ba539a5cd

mod_component: For disconnected external components, if a name is specified in config, return it in disco#info replies.
author Waqas Hussain <waqas20@gmail.com>
date Wed, 01 Aug 2012 01:36:13 +0500
parent 5041:be204204cc5f
child 5110:72a7427368f8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 local error, type, pairs = error, 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 module("storagemanager")
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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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18 _M.olddm = olddm;
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20 local null_storage_method = function () return false, "no data storage active"; end
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21 local null_storage_driver = setmetatable(
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22 {
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23 name = "null",
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24 open = function (self) return self; end
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25 }, {
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26 __index = function (self, method)
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27 return null_storage_method;
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28 end
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29 }
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30 );
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32 local stores_available = multitable.new();
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34 function initialize_host(host)
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35 local host_session = hosts[host];
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36 host_session.events.add_handler("item-added/data-driver", function (event)
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37 local item = event.item;
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38 stores_available:set(host, item.name, item);
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39 end);
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41 host_session.events.add_handler("item-removed/data-driver", function (event)
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42 local item = event.item;
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43 stores_available:set(host, item.name, nil);
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44 end);
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45 end
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46 prosody.events.add_handler("host-activated", initialize_host, 101);
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47
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48 function load_driver(host, driver_name)
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49 if driver_name == "null" then
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50 return null_storage_driver;
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51 end
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52 local driver = stores_available:get(host, driver_name);
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53 if driver then return driver; end
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54 local ok, err = modulemanager.load(host, "storage_"..driver_name);
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55 if not ok then
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56 log("error", "Failed to load storage driver plugin %s on %s: %s", driver_name, host, err);
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57 end
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58 return stores_available:get(host, driver_name);
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59 end
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60
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61 function get_driver(host, store)
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62 local storage = config.get(host, "core", "storage");
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63 local driver_name;
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64 local option_type = type(storage);
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65 if option_type == "string" then
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66 driver_name = storage;
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67 elseif option_type == "table" then
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68 driver_name = storage[store];
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69 end
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70 if not driver_name then
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71 driver_name = config.get(host, "core", "default_storage") or "internal";
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72 end
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73
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74 local driver = load_driver(host, driver_name);
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75 if not driver then
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76 log("warn", "Falling back to null driver for %s storage on %s", store, host);
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77 driver_name = "null";
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78 driver = null_storage_driver;
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79 end
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80 return driver, driver_name;
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81 end
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82
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83 function open(host, store, typ)
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84 local driver, driver_name = get_driver(host, store);
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85 local ret, err = driver:open(store, typ);
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86 if not ret then
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87 if err == "unsupported-store" then
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88 log("debug", "Storage driver %s does not support store %s (%s), falling back to null driver",
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89 driver_name, store, typ);
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90 ret = null_storage_driver;
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91 err = nil;
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92 end
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93 end
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94 return ret, err;
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95 end
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96
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97 function datamanager.load(username, host, datastore)
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98 return open(host, datastore):get(username);
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99 end
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100 function datamanager.store(username, host, datastore, data)
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101 return open(host, datastore):set(username, data);
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102 end
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103 function datamanager.list_stores(username, host)
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104 return get_driver(host):list_stores(username, host);
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105 end
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106 function datamanager.purge(username, host)
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107 return get_driver(host):purge(username, host);
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108 end
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109
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110 return _M;