view mod_measure_storage/mod_measure_storage.lua @ 5186:fa3059e653fa

mod_http_oauth2: Implement the Implicit flow Everyone says this is insecure and bad, but it's also the only thing that makes sense for e.g. pure JavaScript clients, but hey implement this even more complicated thing instead!
author Kim Alvefur <zash@zash.se>
date Thu, 02 Mar 2023 22:06:50 +0100
parents 04ae5b45e6c7
children
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line source

module:set_global()

local function return_args_after_calling(f, ...)
	f();
	return ...
end

local function time_method(module, store_name, store_type, method_name, method_function)
	local opt_use_tags = module:get_option_boolean("measure_storage_tagged_metric", false);

	local metric_name, metric_tags;
	if opt_use_tags then
		metric_name, metric_tags = "storage_operation", ("store_name:%s,store_type:%s,store_operation:%s"):format(store_name, store_type, method_name);
	else
		metric_name = store_name.."_"..store_type.."_"..method_name;
	end
	local measure_operation_started = module:measure(metric_name, "times", metric_tags);

	return function (...)
		module:log("debug", "Measuring storage operation %s (%s)", metric_name, metric_tags or "no tags");
		local measure_operation_complete = measure_operation_started();
		return return_args_after_calling(measure_operation_complete, method_function(...));
	end;
end

local function wrap_store(module, store_name, store_type, store)
	local new_store = setmetatable({}, {
		__index = function (t, method_name)
			local original_method = store[method_name];
			if type(original_method) ~= "function" then
				if original_method then
					rawset(t, method_name, original_method);
				end
				return original_method;
			end
			local timed_method = time_method(module, store_name, store_type, method_name, original_method);
			rawset(t, method_name, timed_method);
			return timed_method;
		end;
	});
	return new_store;
end

local function hook_event(module)
	module:hook("store-opened", function(event)
		event.store = wrap_store(module, event.store_name, event.store_type or "keyval", event.store);
	end);
end

function module.load()
	hook_event(module);
end

function module.add_host(module)
	hook_event(module);
end