annotate mod_measure_storage/mod_measure_storage.lua @ 5608:1893ae742f66

mod_http_oauth2: Show errors on device flow user code entry page If the user enters the code incorrectly, having to click back to try again is no fun. Instead, show the error and the code entry form again.
author Kim Alvefur <zash@zash.se>
date Wed, 19 Jul 2023 13:05:47 +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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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