prosody
f8879cee87a2
core/storagemanager.lua

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core/storagemanager.lua @ 3661:f8879cee87a2

storagemanager: Return driver from load_driver() if successful
author Matthew Wild <mwild1@gmail.com>
date Sat, 27 Nov 2010 21:57:20 +0000
parent 3659:aa7bf12a5668
child 3662:dc3ccef7898f
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1
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2 local error, type = error, type;
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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 olddm = {}; -- maintain old datamanager, for backwards compatibility
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13 for k,v in pairs(datamanager) do olddm[k] = v; end
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15 module("storagemanager")
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17 local default_driver_mt = { name = "internal" };
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18 default_driver_mt.__index = default_driver_mt;
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19 function default_driver_mt:open(store)
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20 return setmetatable({ host = self.host, store = store }, default_driver_mt);
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21 end
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22 function default_driver_mt:get(user) return olddm.load(user, self.host, self.store); end
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23 function default_driver_mt:set(user, data) return olddm.store(user, self.host, self.store, data); end
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25 local stores_available = multitable.new();
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27 function initialize_host(host)
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28 host_session.events.add_handler("item-added/data-driver", function (event)
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29 local item = event.item;
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30 stores_available:set(host, item.name, item);
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31 end);
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33 host_session.events.add_handler("item-removed/data-driver", function (event)
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34 local item = event.item;
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35 stores_available:set(host, item.name, nil);
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36 end);
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37 end
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39 local function load_driver(host, driver_name)
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40 if not driver_name then
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41 return;
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42 end
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43 local driver = stores_available:get(host, driver_name);
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44 if not driver then
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45 if driver_name ~= "internal" then
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46 modulemanager.load(host, "storage_"..driver_name);
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47 return stores_available:get(host, driver_name);
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48 else
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49 return setmetatable({host = host}, default_driver_mt);
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50 end
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51 end
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52 end
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53
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54 function open(host, store, typ)
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55 local storage = config.get(host, "core", "storage");
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56 local driver_name;
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57 local option_type = type(storage);
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58 if option_type == "string" then
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59 driver_name = storage;
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60 elseif option_type == "table" then
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61 driver_name = storage[store];
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62 end
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64 local driver = load_driver(host, driver_name);
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65 if not driver then
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66 driver_name = config.get(host, "core", "default_storage");
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67 driver = load_driver(host, driver_name);
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68 if not driver then
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69 driver_name = "internal";
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70 log("warn", "Falling back to default driver for %s storage on %s", store, host);
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71 driver = load_driver(host, driver_name);
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72 end
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73 end
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75 local ret, err = driver:open(store, typ);
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76 if not ret then
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77 if err == "unsupported-store" then
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78 log("debug", "Storage driver %s does not support store %s (%s), falling back to internal driver",
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79 driver_name, store, typ);
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80 ret = setmetatable({ host = host, store = store }, default_driver_mt); -- default to default driver
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81 err = nil;
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82 end
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83 end
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84 return ret, err;
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85 end
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86
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87 function datamanager.load(username, host, datastore)
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88 return open(host, datastore):get(username);
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89 end
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90 function datamanager.store(username, host, datastore, data)
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91 return open(host, datastore):set(username, data);
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92 end
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93
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94 return _M;