prosody
479e96e554c8
net/connect.lua

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net/connect.lua @ 10486:479e96e554c8

net.server_epoll: Add debug logging for delayed reading In :onreadable, if there is still buffered incoming data after reading from the socket (as indicated by the :dirty method, usually because LuaSocket has an 8k buffer that's full but it read a smaller amount), another attempt to read is scheduled via this :pausefor method. This is also called from some other places where it would be pointless to read because there shouldn't be any data. In the delayed read case, this should report that the socket is "dirty". If it reports that the socket is "clean" then the question is where the buffer contents went? If this doesn't get logged after the scheduled time (0.000001s by default) then this would suggests a problem with timer or scheduling.
author Kim Alvefur <zash@zash.se>
date Sat, 07 Dec 2019 19:05:10 +0100
parent 10485:913276ba0c47
child 10612:44ef46e1a951
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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 Respect use_ipv4, use_ipv6
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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 if p.conn then
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33 pending_connections_map[p.conn] = nil;
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34 p.conn = nil;
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35 end
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36 p.target_resolver:next(function (conn_type, ip, port, extra)
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37 if not conn_type then
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38 -- No more targets to try
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39 p:log("debug", "No more connection targets to try");
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40 if p.listeners.onfail then
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41 p.listeners.onfail(p.data, p.last_error or "unable to resolve service");
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42 end
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43 return;
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44 end
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45 p:log("debug", "Next target to try is %s:%d", ip, port);
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46 local conn, err = server.addclient(ip, port, pending_connection_listeners, p.options.pattern or "*a", 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 };