Mercurial > prosody-modules

annotate mod_storage_multi/mod_storage_multi.lua @ 5265:f845c218e52c

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mod_http_oauth2: Allow revoking a token without OAuth client credentials If you have a valid token, and you're not supposed to have it, revoking it seems the most responsible thing to do with it, so it should be allowed, while if you are supposed to have it, you should also be allowed to revoke it.
author Kim Alvefur <zash@zash.se>
date Tue, 21 Mar 2023 22:02:38 +0100
parents 8c4a2d85e8bf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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);