Mercurial > prosody-modules

annotate mod_storage_multi/mod_storage_multi.lua @ 5627:3a5cf8d80089

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mod_http_oauth2: Tweak method of centering the UI The percentage here was relative to the viewport width, which on some very wide screens may put the UI slightly outside of the view, requiring scrolling to see. By using a unit relative to the height of the viewport, this is avoided and should work better. But no guarantees, it's still possible to resize the browser or adjust font sizes so that the UI goes out of view.
author Kim Alvefur <zash@zash.se>
date Mon, 31 Jul 2023 07:28:09 +0200
parents 8c4a2d85e8bf
children
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8c4a2d85e8bf mod_storage_multi: Multi-backend storage module (WIP)
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1 -- mod_storage_multi
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2
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3 local storagemanager = require"core.storagemanager";
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4 local backends = module:get_option_array(module.name); -- TODO better name?
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5
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6 -- TODO migrate data "upwards"
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7
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8 -- one → one successful write is success
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9 -- all → all backends must report success
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10 -- majority → majority of backends must report success
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11 local policy = module:get_option_string(module.name.."_policy", "all");
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12
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13 local keyval_store = {};
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14 keyval_store.__index = keyval_store;
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15
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16 function keyval_store:get(username)
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17 local backends = self.backends;
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18 local data, err;
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19 for i = 1, #backends do
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20 module:log("debug", "%s:%s:get(%q)", tostring(backends[i].get), backends[i]._store, username);
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21 data, err = backends[i]:get(username);
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22 if err then
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23 module:log("error", tostring(err));
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24 elseif not data then
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25 module:log("debug", "No data returned");
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26 else
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27 module:log("debug", "Data returned");
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28 return data, err;
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29 end
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30 end
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31 end
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32
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33 -- This is where it gets complicated
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34 function keyval_store:set(username, data)
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35 local backends = self.backends;
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36 local ok, err, backend;
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37 local all, one, oks = true, false, 0;
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38 for i = 1, #backends do
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39 backend = backends[i];
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40 module:log("debug", "%s:%s:set(%q)", tostring(backends[i].get), backends[i].store, username);
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41 ok, err = backend:set(username, data);
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42 if not ok then
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43 module:log("error", "Error in storage driver %s: %s", backend.name, tostring(err));
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44 else
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45 oks = oks + 1;
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46 end
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47 one = one or ok; -- At least one successful write
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48 all = all and ok; -- All successful
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49 end
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50 if policy == "all" then
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51 return all, err
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52 elseif policy == "majority" then
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53 return oks > (#backends/2), err;
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54 end
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55 -- elseif policy == "one" then
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56 return one, err;
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57 end
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58
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59 local stores = {
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60 keyval = keyval_store;
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61 }
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62
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63 local driver = {};
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64
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65 function driver:open(store, typ)
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66 local store_mt = stores[typ or "keyval"];
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67 if store_mt then
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68 local my_backends = {};
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69 local driver, opened
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70 for i = 1, #backends do
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71 driver = storagemanager.load_driver(module.host, backends[i]);
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72 opened = driver:open(store, typ);
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73 my_backends[i] = assert(driver:open(store, typ));
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74 my_backends[i]._store = store;
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75 end
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76 return setmetatable({ backends = my_backends }, store_mt);
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77 end
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78 return nil, "unsupported-store";
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79 end
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80
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81 module:provides("storage", driver);