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annotate mod_http_stats_stream/mod_http_stats_stream.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 740870196b97
children bac3dae031ee
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1 module:set_global();
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2
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3 local statsman = require "core.statsmanager";
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4 local http = require "net.http.server";
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5 local json = require "util.json";
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6
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7 local sessions = {};
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8
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9 local function updates_client_closed(response)
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10 module:log("debug", "Streamstats client closed");
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11 sessions[response] = nil;
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12 end
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13
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14 local function get_updates(event)
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15 local request, response = event.request, event.response;
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16
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17 response.on_destroy = updates_client_closed;
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18
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19 response.headers.content_type = "text/event-stream";
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20 response.headers.x_accel_buffering = "no"; -- for nginx maybe?
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21 local resp = http.prepare_header(response);
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22 table.insert(resp, "event: stats-full\r\n");
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23 table.insert(resp, "data: ");
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24 table.insert(resp, json.encode(statsman.get_stats()));
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25 table.insert(resp, "\r\n\r\n");
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26 response.conn:write(table.concat(resp));
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27
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28 sessions[response] = request;
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29 return true;
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30 end
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32
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33 module:hook("stats-updated", function (event)
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34 local data = table.concat({
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35 "event: stats-updated";
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36 "data: "..json.encode(event.changed_stats);
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37 "";
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38 "";
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39 }, "\r\n")
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40 for response in pairs(sessions) do
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41 response.conn:write(data);
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42 end
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43 end);
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44
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45
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46 module:depends("http");
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47 module:provides("http", {
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48 route = {
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49 GET = get_updates;
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50 }
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51 });