prosody
62ef68f95b6f
net/resolvers/service.lua

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net/resolvers/service.lua @ 10682:62ef68f95b6f 0.11

mod_mam,mod_muc_mam: Allow other work to be performed during archive cleanup (fixes #1504) This lets Prosody handle socket related work between each step in the cleanup in order to prevent the server from being completely blocked during this. An async storage backend would not need this but those are currently rare.
author Kim Alvefur <zash@zash.se>
date Wed, 11 Mar 2020 21:15:01 +0100
parent 10400:4c2d789a106b
child 10401:1ef1f6c43c5b
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1 local adns = require "net.adns";
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2 local basic = require "net.resolvers.basic";
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3 local idna_to_ascii = require "util.encodings".idna.to_ascii;
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4
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5 local methods = {};
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6 local resolver_mt = { __index = methods };
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7
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8 -- Find the next target to connect to, and
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9 -- pass it to cb()
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10 function methods:next(cb)
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11 if self.targets then
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12 if #self.targets == 0 then
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13 cb(nil);
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14 return;
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15 end
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16 local next_target = table.remove(self.targets, 1);
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17 self.resolver = basic.new(unpack(next_target, 1, 4));
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18 self.resolver:next(function (...)
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19 if ... == nil then
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20 self:next(cb);
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21 else
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22 cb(...);
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23 end
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24 end);
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25 return;
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26 end
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27
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28 if not self.hostname then
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29 -- FIXME report IDNA error
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30 cb(nil);
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31 return;
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32 end
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33
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34 local targets = {};
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35 local function ready()
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36 self.targets = targets;
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37 self:next(cb);
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38 end
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39
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40 -- Resolve DNS to target list
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41 local dns_resolver = adns.resolver();
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42 dns_resolver:lookup(function (answer)
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43 if answer then
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44 if #answer == 0 then
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45 if self.extra and self.extra.default_port then
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46 table.insert(targets, { self.hostname, self.extra.default_port, self.conn_type, self.extra });
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47 end
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48 ready();
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49 return;
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50 end
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51
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52 if #answer == 1 and answer[1].srv.target == "." then -- No service here
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53 ready();
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54 return;
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55 end
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56
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57 table.sort(answer, function (a, b) return a.srv.priority < b.srv.priority end);
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58 for _, record in ipairs(answer) do
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59 table.insert(targets, { record.srv.target, record.srv.port, self.conn_type, self.extra });
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60 end
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61 end
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62 ready();
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63 end, "_" .. self.service .. "._" .. self.conn_type .. "." .. self.hostname, "SRV", "IN");
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64 end
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65
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66 local function new(hostname, service, conn_type, extra)
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67 return setmetatable({
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68 hostname = idna_to_ascii(hostname);
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69 service = service;
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70 conn_type = conn_type or "tcp";
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71 extra = extra;
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72 }, resolver_mt);
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73 end
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74
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75 return {
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76 new = new;
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77 };