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annotate mod_log_events_by_memory/mod_log_events_by_memory.lua @ 4249:64aa1d9d70ac

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mod_rest: Catch and log errors in callback promise chain From the code it looks like it should be possible to reply to an error stanza, but it did not. Turns out I was saved by my local developer mode module which throws errors if an attempt is made to create an errror reply to an error stanza. However nothing collects this error from the promise, so all I got was confusion.
author Kim Alvefur <zash@zash.se>
date Sun, 15 Nov 2020 16:25:49 +0100
parents 5fe34e5f9829
children
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5fe34e5f9829 mod_log_events_by_memory: Log events where Lua memory usage increased
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1 module:set_global();
5fe34e5f9829 mod_log_events_by_memory: Log events where Lua memory usage increased
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2
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3 local treshold = module:get_option_number("log_memory_threshold", 20*1024);
5fe34e5f9829 mod_log_events_by_memory: Log events where Lua memory usage increased
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4
5fe34e5f9829 mod_log_events_by_memory: Log events where Lua memory usage increased
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5 function event_wrapper(handlers, event_name, event_data)
5fe34e5f9829 mod_log_events_by_memory: Log events where Lua memory usage increased
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6 local memory_before = collectgarbage("count")*1024;
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7 local ret = handlers(event_name, event_data);
5fe34e5f9829 mod_log_events_by_memory: Log events where Lua memory usage increased
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8 local memory_after = collectgarbage("count")*1024;
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9 if (memory_after - memory_before) > treshold then
5fe34e5f9829 mod_log_events_by_memory: Log events where Lua memory usage increased
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10 module:log("warn", "Memory increased by %g bytes while processing event '%s'", (memory_after - memory_before), event_name);
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11 end
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12 return ret;
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13 end
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15 local http_events = require "net.http.server"._events;
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16 module:wrap_object_event(http_events, false, event_wrapper);
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17
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18 module:wrap_event(false, event_wrapper);
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19 function module.add_host(module)
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20 module:wrap_event(false, event_wrapper);
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21 end