prosody-modules
0f5657db1cfc
mod_storage_multi/mod_storage_multi.lua

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mod_storage_multi/mod_storage_multi.lua @ 5296:0f5657db1cfc

mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parent 1492:8c4a2d85e8bf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1492
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);