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annotate mod_inotify_reload/mod_inotify_reload.lua @ 3503:882180b459a0

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mod_pubsub_post: Restructure authentication and authorization (BC) This deprecates the default "superuser" actor model and makes the default equivalent to the previous "request.id". A single actor and secret per node is supported because HTTP and WebHooks don't normally include any authorization identity. Allowing authentication bypass when no secret is given should be relatively safe when the actor is unprivileged, as will be unless explicitly configured otherwise.
author Kim Alvefur <zash@zash.se>
date Sat, 30 Mar 2019 21:16:13 +0100
parents ab988e98a9f9
children 82207f936f1f
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1 -- mod_inotify_reload
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2 -- Reloads modules when their files change
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3 -- Depends on linotify: https://github.com/hoelzro/linotify
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4
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5 module:set_global();
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6
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7 local inotify = require "inotify";
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8 local modulemanager = require "core.modulemanager";
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9
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10 local inh = inotify.init();
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11
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12 local watches = {};
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13 local watch_ids = {};
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15 -- Fake socket object around inotify
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16 local inh_conn = {
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17 getfd = function () return inh:fileno(); end;
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18 dirty = function (self) return false; end;
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19 settimeout = function () end;
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20 send = function (_, d) return #d, 0; end;
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21 close = function () end;
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22 receive = function ()
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23 local events = inh:read();
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24 for _, event in ipairs(events) do
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25 local mod = watches[watch_ids[event.wd]];
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26 if mod then
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27 local host, name = mod.host, mod.name;
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28 module:log("debug", "Reloading changed module mod_%s on %s", name, host);
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29 modulemanager.reload(host, name);
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30 else
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31 module:log("warn", "no watch for %d", event.wd);
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32 end
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33 end
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34 return "";
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35 end
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36 };
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37 require "net.server".wrapclient(inh_conn, "inotify", inh:fileno(), {
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38 onincoming = function () end, ondisconnect = function () end
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39 }, "*a");
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40
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41 function watch_module(name, host, path)
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42 local id, err = inh:addwatch(path, inotify.IN_CLOSE_WRITE);
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43 if not id then return nil, err; end
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44 local k = host.."\0"..name;
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45 watches[k] = { id = id, path = path, name = name, host = host };
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46 watch_ids[id] = k;
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47 module:log("debug", "Watching %s:%s with id %d", name, host, id);
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48 return true;
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49 end
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50
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51 function unwatch_module(name, host)
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52 local k = host.."\0"..name;
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53 if not watches[k] then
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54 module:log("warn", "Not watching %s:%s", name, host);
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55 return nil, "not-watching";
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56 end
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57 local id = watches[k].id;
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58 local ok, err = inh:rmwatch(id);
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59 module:log("info", "Removed watch %d", id);
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60 watches[k] = nil;
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61 watch_ids[id] = nil;
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62 return ok, err;
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63 end
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64
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65 function module_loaded(event)
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66 local host, name = event.host, event.module;
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67 local path = modulemanager.get_module(host, name).module.path;
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68 if not path then
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69 module:log("warn", "Couldn't watch mod_%s, no path", name);
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70 return;
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71 end
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72 if watch_module(name, host, path) then
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73 module:log("debug", "Watching mod_%s", name);
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74 end
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75 end
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76
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77 function module_unloaded(event)
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78 unwatch_module(event.module, event.host);
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79 end
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80
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81 function module.add_host(module)
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82 module:hook("module-loaded", module_loaded);
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83 module:hook("module-unloaded", module_unloaded);
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84 end
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85
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86 module:hook("module-loaded", module_loaded);
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87 module:hook("module-unloaded", module_unloaded);
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88