Annotate

mod_log_json/mod_log_json.lua @ 4462:4356088ad675

mod_log_json: allow logging of formatted message This is for logging pipelines which can not or do not want to interpret sprintf-style strings but still need the complete string for search or whatever.
author Jonas Schäfer <jonas@wielicki.name>
date Mon, 22 Feb 2021 16:08:55 +0100
parent 3758:900ea02ab00b
child 4974:807007913f67
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1 local pack = require "util.table".pack;
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2 local json = require "util.json";
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3 local array = require "util.array";
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4 local datetime = require "util.datetime".datetime;
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5 local socket = require "socket";
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6
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7 module:set_global();
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8
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9 local function sink_maker(config)
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10 local send = function () end
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11 if config.filename then
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12 local logfile = io.open(config.filename, "a+");
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13 logfile:setvbuf("no");
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14 function send(payload)
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15 logfile:write(payload, "\n");
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16 end
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17 elseif config.udp_host and config.udp_port then
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18 local conn = socket.udp();
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19 conn:setpeername(config.udp_host, config.udp_port);
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20 function send(payload)
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21 conn:send(payload);
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22 end
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23 end
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24 local format = require "util.format".format;
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25 local do_format = config.formatted_as or false;
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26 return function (source, level, message, ...)
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27 local args = pack(...);
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28 for i = 1, args.n do
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29 if args[i] == nil then
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30 args[i] = json.null;
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31 elseif type(args[i]) ~= "string" or type(args[i]) ~= "number" then
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32 args[i] = tostring(args[i]);
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33 end
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34 end
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35 args.n = nil;
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36 local payload = {
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37 datetime = datetime(),
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38 source = source,
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39 level = level,
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40 message = message,
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41 args = array(args);
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42 };
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43 if do_format then
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44 payload[do_format] = format(message, ...)
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45 end
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46 send(json.encode(payload));
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47 end
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48 end
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49
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50 function module.unload()
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51 -- deregister
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52 require"core.loggingmanager".register_sink_type("json", nil);
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53 end
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54
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55 require"core.loggingmanager".register_sink_type("json", sink_maker);