Mercurial > prosody-modules

annotate mod_storage_multi/mod_storage_multi.lua @ 4895:2542fd80cd15

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mod_turn_external: Fix type of config option (thanks mirux) There was a separate boolean option to enable TLS before, but it was merged with the port number option and it seems the typed API interface got confused. Backport of trunk rev aa7a8aa64d3f
author Kim Alvefur <zash@zash.se>
date Tue, 15 Feb 2022 21:51:52 +0100
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);