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mod_storage_multi/mod_storage_multi.lua @ 4989:b74d592df9e2
mod_http_muc_log: Remove dead code
This might be something left over since a different variant where the
loop went like `for n = i-1, i-100, -1 do ... end` i.e. it went trough a
fixed number of items instead of all the page until the current message.
Then it would have needed something to stop going over the end, but
since the checks are simple it shouldn't be much of a problem looping
over even a very busy day.
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 16 Aug 2022 01:27:59 +0200 |
parent | 1492:8c4a2d85e8bf |
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-- mod_storage_multi local storagemanager = require"core.storagemanager"; local backends = module:get_option_array(module.name); -- TODO better name? -- TODO migrate data "upwards" -- one → one successful write is success -- all → all backends must report success -- majority → majority of backends must report success local policy = module:get_option_string(module.name.."_policy", "all"); local keyval_store = {}; keyval_store.__index = keyval_store; function keyval_store:get(username) local backends = self.backends; local data, err; for i = 1, #backends do module:log("debug", "%s:%s:get(%q)", tostring(backends[i].get), backends[i]._store, username); data, err = backends[i]:get(username); if err then module:log("error", tostring(err)); elseif not data then module:log("debug", "No data returned"); else module:log("debug", "Data returned"); return data, err; end end end -- This is where it gets complicated function keyval_store:set(username, data) local backends = self.backends; local ok, err, backend; local all, one, oks = true, false, 0; for i = 1, #backends do backend = backends[i]; module:log("debug", "%s:%s:set(%q)", tostring(backends[i].get), backends[i].store, username); ok, err = backend:set(username, data); if not ok then module:log("error", "Error in storage driver %s: %s", backend.name, tostring(err)); else oks = oks + 1; end one = one or ok; -- At least one successful write all = all and ok; -- All successful end if policy == "all" then return all, err elseif policy == "majority" then return oks > (#backends/2), err; end -- elseif policy == "one" then return one, err; end local stores = { keyval = keyval_store; } local driver = {}; function driver:open(store, typ) local store_mt = stores[typ or "keyval"]; if store_mt then local my_backends = {}; local driver, opened for i = 1, #backends do driver = storagemanager.load_driver(module.host, backends[i]); opened = driver:open(store, typ); my_backends[i] = assert(driver:open(store, typ)); my_backends[i]._store = store; end return setmetatable({ backends = my_backends }, store_mt); end return nil, "unsupported-store"; end module:provides("storage", driver);