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annotate mod_measure_storage/mod_measure_storage.lua @ 4936:a85efae90e21

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mod_rest: Expand mapping of XEP-0045 join stanza The previous 'join' mapping was apparently lost in translation when swithing to datamapper, so might as well map some properties allowing history control. Usually you probably want either zero history or history since the last known time of being joined. Maybe that the former should be the default?
author Kim Alvefur <zash@zash.se>
date Sat, 30 Apr 2022 01:00:01 +0200
parents 04ae5b45e6c7
children
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992e40dab31d mod_measure_storage: Experimental new module to measure storage API operations (requires 0.10)
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1 module:set_global()
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2
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3 local function return_args_after_calling(f, ...)
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4 f();
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5 return ...
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6 end
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8 local function time_method(module, store_name, store_type, method_name, method_function)
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9 local opt_use_tags = module:get_option_boolean("measure_storage_tagged_metric", false);
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10
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11 local metric_name, metric_tags;
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12 if opt_use_tags then
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13 metric_name, metric_tags = "storage_operation", ("store_name:%s,store_type:%s,store_operation:%s"):format(store_name, store_type, method_name);
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14 else
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15 metric_name = store_name.."_"..store_type.."_"..method_name;
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16 end
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39cb2a51e779 mod_measure_storage: Pass the measurement type, fixes traceback
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17 local measure_operation_started = module:measure(metric_name, "times", metric_tags);
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19 return function (...)
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20 module:log("debug", "Measuring storage operation %s (%s)", metric_name, metric_tags or "no tags");
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21 local measure_operation_complete = measure_operation_started();
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22 return return_args_after_calling(measure_operation_complete, method_function(...));
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23 end;
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24 end
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25
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26 local function wrap_store(module, store_name, store_type, store)
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27 local new_store = setmetatable({}, {
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28 __index = function (t, method_name)
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29 local original_method = store[method_name];
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30 if type(original_method) ~= "function" then
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31 if original_method then
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32 rawset(t, method_name, original_method);
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33 end
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34 return original_method;
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35 end
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36 local timed_method = time_method(module, store_name, store_type, method_name, original_method);
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37 rawset(t, method_name, timed_method);
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38 return timed_method;
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39 end;
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40 });
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41 return new_store;
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42 end
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43
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44 local function hook_event(module)
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45 module:hook("store-opened", function(event)
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46 event.store = wrap_store(module, event.store_name, event.store_type or "keyval", event.store);
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47 end);
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48 end
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49
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50 function module.load()
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51 hook_event(module);
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52 end
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53
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54 function module.add_host(module)
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55 hook_event(module);
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56 end