prosody
e2cc09e83a3e
core/storagemanager.lua

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core/storagemanager.lua @ 3565:e2cc09e83a3e

util.httpstream: A little refactoring of the coroutine control flow.
author Waqas Hussain <waqas20@gmail.com>
date Sat, 06 Nov 2010 01:08:30 +0500
parent 3403:b89680015b7b
child 3644:22fc2063b824
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1
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2 local error = error;
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3 local setmetatable = setmetatable;
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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 multitable = require "util.multitable";
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8 local modulemanager = require "core.modulemanager";
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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 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 local driver_cache = multitable.new();
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16 local store_cache = multitable.new();
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18 module("storagemanager")
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20 local default_driver_mt = {};
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21 default_driver_mt.__index = default_driver_mt;
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22 function default_driver_mt:open(store)
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23 return setmetatable({ host = self.host, store = store }, default_driver_mt);
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24 end
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25 function default_driver_mt:get(user) return olddm.load(user, self.host, self.store); end
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26 function default_driver_mt:set(user, data) return olddm.store(user, self.host, self.store, data); end
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28 local function load_driver_for_host(host)
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29 if driver_cache:get(host) then return driver_cache:get(host); end
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31 local host_session = hosts[host];
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32 if not host_session then error("No such host"); end
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34 local driver_plugin = config.get(host, "core", "datastore");
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35 if not driver_plugin then return setmetatable({ host = host }, default_driver_mt); end
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37 local provider;
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38 local function handler(event) provider = event.item; end
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39 host_session.events.add_handler("item-added/data-driver", handler);
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40 local success, err = modulemanager.load(host, driver_plugin);
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41 host_session.events.remove_handler("item-added/data-driver", handler);
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42 if not success then error(err); end
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43 if not provider then error("Module didn't add a provider"); end
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45 driver_cache:set(host, provider);
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46 log("debug", "Data driver '%s' loaded for host '%s'", driver_plugin, host);
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47 return provider;
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48 end
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50 function open(host, store, typ)
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51 local ret = store_cache:get(host, store);
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52 if not ret then
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53 local driver = load_driver_for_host(host);
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54 ret = driver:open(store, typ);
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55 if not ret then ret = setmetatable({ host = host, store = store }, default_driver_mt); end -- default to default driver
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56 store_cache:set(host, store, ret);
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57 end
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58 return ret;
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59 end
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60
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61 function datamanager.load(username, host, datastore)
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62 return open(host, datastore):get(username);
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63 end
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64 function datamanager.store(username, host, datastore, data)
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65 return open(host, datastore):set(username, data);
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66 end
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67
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68 return _M;