prosody
18a3a6218100
net/connect.lua

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net/connect.lua @ 12412:18a3a6218100

net.connect: When more targets are immediately available, try them after a delay RFC 8305
author Matthew Wild <mwild1@gmail.com>
date Fri, 18 Mar 2022 16:16:57 +0000
parent 12411:e132a4279914
child 12425:eabcc3ae22e9
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1 local server = require "net.server";
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2 local log = require "util.logger".init("net.connect");
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3 local new_id = require "util.id".short;
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4 local timer = require "util.timer";
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5
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6 -- TODO #1246 Happy Eyeballs
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7 -- FIXME RFC 6724
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8 -- FIXME Error propagation from resolvers doesn't work
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9 -- FIXME #1428 Reuse DNS resolver object between service and basic resolver
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10 -- FIXME #1429 Close DNS resolver object when done
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11
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12 local pending_connection_methods = {};
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13 local pending_connection_mt = {
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14 __name = "pending_connection";
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15 __index = pending_connection_methods;
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16 __tostring = function (p)
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17 return "<pending connection "..p.id.." to "..tostring(p.target_resolver.hostname)..">";
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18 end;
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19 };
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20
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21 function pending_connection_methods:log(level, message, ...)
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22 log(level, "[pending connection %s] "..message, self.id, ...);
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23 end
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24
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25 -- pending_connections_map[conn] = pending_connection
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26 local pending_connections_map = {};
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27
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28 local pending_connection_listeners = {};
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29
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30 local function attempt_connection(p)
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31 p:log("debug", "Checking for targets...");
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32 p.target_resolver:next(function (conn_type, ip, port, extra, more_targets_available)
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33 if not conn_type then
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34 -- No more targets to try
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35 p:log("debug", "No more connection targets to try", p.target_resolver.last_error);
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36 if p.listeners.onfail then
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37 p.listeners.onfail(p.data, p.last_error or p.target_resolver.last_error or "unable to resolve service");
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38 end
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39 return;
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40 end
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41 p:log("debug", "Next target to try is %s:%d", ip, port);
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42 local conn, err = server.addclient(ip, port, pending_connection_listeners, p.options.pattern or "*a",
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43 extra and extra.sslctx or p.options.sslctx, conn_type, extra);
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44 if not conn then
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45 log("debug", "Connection attempt failed immediately: %s", err);
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46 p.last_error = err or "unknown reason";
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47 return attempt_connection(p);
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48 end
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49 p.conns[conn] = true;
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50 pending_connections_map[conn] = p;
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51 if more_targets_available then
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52 timer.add_task(0.250, function ()
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53 if not p.connected then
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54 p:log("debug", "Still not connected, making parallel connection attempt...");
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55 attempt_connection(p);
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56 end
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57 end);
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58 end
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59 end);
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60 end
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61
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62 function pending_connection_listeners.onconnect(conn)
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63 local p = pending_connections_map[conn];
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64 if not p then
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65 log("warn", "Successful connection, but unexpected! Closing.");
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66 conn:close();
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67 return;
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68 end
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69 pending_connections_map[conn] = nil;
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70 if p.connected then
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71 -- We already succeeded in connecting
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72 p.conns[conn] = nil;
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73 conn:close();
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74 return;
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75 end
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76 p.connected = true;
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77 p:log("debug", "Successfully connected");
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78 conn:setlistener(p.listeners, p.data);
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79 return p.listeners.onconnect(conn);
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80 end
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81
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82 function pending_connection_listeners.ondisconnect(conn, reason)
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83 local p = pending_connections_map[conn];
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84 if not p then
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85 log("warn", "Failed connection, but unexpected!");
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86 return;
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87 end
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88 p.conns[conn] = nil;
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89 p.last_error = reason or "unknown reason";
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90 p:log("debug", "Connection attempt failed: %s", p.last_error);
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91 attempt_connection(p);
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92 end
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93
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94 local function connect(target_resolver, listeners, options, data)
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95 local p = setmetatable({
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96 id = new_id();
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97 target_resolver = target_resolver;
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98 listeners = assert(listeners);
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99 options = options or {};
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100 data = data;
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101 conns = {};
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102 }, pending_connection_mt);
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103
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104 p:log("debug", "Starting connection process");
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105 attempt_connection(p);
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106 end
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107
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108 return {
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109 connect = connect;
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110 };