prosody
d5f322dd424b
net/connect.lua

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net/connect.lua @ 13110:d5f322dd424b 0.12

mod_s2s: Add event where resolver for s2sout can be tweaked Could be used to implement custom connection methods (c.f. mod_onions) without needing to duplicate the rest of route_to_new_session(). Adds a feature to enable detection since it can be difficult to detect support for an event otherwise.
author Kim Alvefur <zash@zash.se>
date Thu, 18 Aug 2022 03:26:32 +0200
parent 12205:a2e6605303fa
child 12411:e132a4279914
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601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
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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
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5 -- TODO #1246 Happy Eyeballs
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913276ba0c47 net.connect: Mention RFC 6724 regression
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6 -- FIXME RFC 6724
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7 -- FIXME Error propagation from resolvers doesn't work
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8 -- FIXME #1428 Reuse DNS resolver object between service and basic resolver
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9 -- FIXME #1429 Close DNS resolver object when done
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10
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11 local pending_connection_methods = {};
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12 local pending_connection_mt = {
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13 __name = "pending_connection";
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14 __index = pending_connection_methods;
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15 __tostring = function (p)
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16 return "<pending connection "..p.id.." to "..tostring(p.target_resolver.hostname)..">";
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17 end;
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18 };
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19
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20 function pending_connection_methods:log(level, message, ...)
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21 log(level, "[pending connection %s] "..message, self.id, ...);
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22 end
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23
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24 -- pending_connections_map[conn] = pending_connection
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25 local pending_connections_map = {};
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26
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27 local pending_connection_listeners = {};
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28
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29 local function attempt_connection(p)
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30 p:log("debug", "Checking for targets...");
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31 if p.conn then
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32 pending_connections_map[p.conn] = nil;
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33 p.conn = nil;
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34 end
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35 p.target_resolver:next(function (conn_type, ip, port, extra)
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36 if not conn_type then
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37 -- No more targets to try
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38 p:log("debug", "No more connection targets to try", p.target_resolver.last_error);
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39 if p.listeners.onfail then
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40 p.listeners.onfail(p.data, p.last_error or p.target_resolver.last_error or "unable to resolve service");
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41 end
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42 return;
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43 end
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44 p:log("debug", "Next target to try is %s:%d", ip, port);
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45 local conn, err = server.addclient(ip, port, pending_connection_listeners, p.options.pattern or "*a",
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46 extra and extra.sslctx or p.options.sslctx, conn_type, extra);
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47 if not conn then
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48 log("debug", "Connection attempt failed immediately: %s", err);
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49 p.last_error = err or "unknown reason";
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50 return attempt_connection(p);
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51 end
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52 p.conn = conn;
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53 pending_connections_map[conn] = p;
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54 end);
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55 end
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56
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57 function pending_connection_listeners.onconnect(conn)
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58 local p = pending_connections_map[conn];
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59 if not p then
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60 log("warn", "Successful connection, but unexpected! Closing.");
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61 conn:close();
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62 return;
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63 end
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64 pending_connections_map[conn] = nil;
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65 p:log("debug", "Successfully connected");
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66 conn:setlistener(p.listeners, p.data);
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67 return p.listeners.onconnect(conn);
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68 end
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69
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70 function pending_connection_listeners.ondisconnect(conn, reason)
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71 local p = pending_connections_map[conn];
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72 if not p then
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73 log("warn", "Failed connection, but unexpected!");
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74 return;
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75 end
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76 p.last_error = reason or "unknown reason";
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77 p:log("debug", "Connection attempt failed: %s", p.last_error);
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78 attempt_connection(p);
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79 end
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80
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81 local function connect(target_resolver, listeners, options, data)
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82 local p = setmetatable({
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83 id = new_id();
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84 target_resolver = target_resolver;
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85 listeners = assert(listeners);
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86 options = options or {};
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87 data = data;
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88 }, pending_connection_mt);
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89
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90 p:log("debug", "Starting connection process");
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91 attempt_connection(p);
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92 end
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93
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94 return {
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95 connect = connect;
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96 };