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spec/net_resolvers_service_spec.lua @ 12984:f08125a8be34
util.format: Restore "freeze" serialization behavior in logging
This was implied with the "debug" preset and does nice things like turn
util.set objects into "set{a,b,c}" instead of the quite verbose thing
you get otherwise.
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 26 Mar 2023 00:33:20 +0100 |
parent | 12401:c029ddcad258 |
rev | line source |
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12401
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1 local set = require "util.set"; |
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2 |
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3 insulate("net.resolvers.service", function () |
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4 local adns = { |
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5 resolver = function () |
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6 return { |
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7 lookup = function (_, cb, qname, qtype, qclass) |
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8 if qname == "_xmpp-server._tcp.example.com" |
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9 and (qtype or "SRV") == "SRV" |
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10 and (qclass or "IN") == "IN" then |
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11 cb({ |
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12 { -- 60+35+60 |
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13 srv = { target = "xmpp0-a.example.com", port = 5228, priority = 0, weight = 60 }; |
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14 }; |
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15 { |
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16 srv = { target = "xmpp0-b.example.com", port = 5216, priority = 0, weight = 35 }; |
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17 }; |
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18 { |
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19 srv = { target = "xmpp0-c.example.com", port = 5200, priority = 0, weight = 0 }; |
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20 }; |
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21 { |
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22 srv = { target = "xmpp0-d.example.com", port = 5256, priority = 0, weight = 120 }; |
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23 }; |
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24 |
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25 { |
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26 srv = { target = "xmpp1-a.example.com", port = 5273, priority = 1, weight = 30 }; |
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27 }; |
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28 { |
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29 srv = { target = "xmpp1-b.example.com", port = 5274, priority = 1, weight = 30 }; |
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30 }; |
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31 |
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32 { |
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33 srv = { target = "xmpp2.example.com", port = 5275, priority = 2, weight = 0 }; |
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34 }; |
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35 }); |
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36 elseif qname == "_xmpp-server._tcp.single.example.com" |
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37 and (qtype or "SRV") == "SRV" |
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38 and (qclass or "IN") == "IN" then |
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39 cb({ |
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40 { |
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41 srv = { target = "xmpp0-a.example.com", port = 5269, priority = 0, weight = 0 }; |
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42 }; |
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43 }); |
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44 elseif qname == "_xmpp-server._tcp.half.example.com" |
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45 and (qtype or "SRV") == "SRV" |
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46 and (qclass or "IN") == "IN" then |
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47 cb({ |
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48 { |
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49 srv = { target = "xmpp0-a.example.com", port = 5269, priority = 0, weight = 0 }; |
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50 }; |
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51 { |
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52 srv = { target = "xmpp0-b.example.com", port = 5270, priority = 0, weight = 1 }; |
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53 }; |
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54 }); |
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55 elseif qtype == "A" then |
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56 local l = qname:match("%-(%a)%.example.com$") or "1"; |
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57 local d = ("%d"):format(l:byte()) |
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58 cb({ |
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59 { |
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60 a = "127.0.0."..d; |
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61 }; |
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62 }); |
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63 elseif qtype == "AAAA" then |
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64 local l = qname:match("%-(%a)%.example.com$") or "1"; |
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65 local d = ("%04d"):format(l:byte()) |
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66 cb({ |
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67 { |
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68 aaaa = "fdeb:9619:649e:c7d9::"..d; |
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69 }; |
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70 }); |
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71 else |
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72 cb(nil); |
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73 end |
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74 end; |
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75 }; |
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76 end; |
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77 }; |
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78 package.loaded["net.adns"] = mock(adns); |
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79 local resolver = require "net.resolvers.service"; |
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80 math.randomseed(os.time()); |
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81 it("works for 99% of deployments", function () |
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82 -- Most deployments only have a single SRV record, let's make |
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83 -- sure that works okay |
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84 |
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85 local expected_targets = set.new({ |
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86 -- xmpp0-a |
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87 "tcp4 127.0.0.97 5269"; |
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88 "tcp6 fdeb:9619:649e:c7d9::0097 5269"; |
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89 }); |
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90 local received_targets = set.new({}); |
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91 |
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92 local r = resolver.new("single.example.com", "xmpp-server"); |
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93 local done = false; |
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94 local function handle_target(...) |
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95 if ... == nil then |
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96 done = true; |
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97 -- No more targets |
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98 return; |
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99 end |
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100 received_targets:add(table.concat({ ... }, " ", 1, 3)); |
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101 end |
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102 r:next(handle_target); |
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103 while not done do |
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104 r:next(handle_target); |
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105 end |
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106 |
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107 -- We should have received all expected targets, and no unexpected |
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108 -- ones: |
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109 assert.truthy(set.xor(received_targets, expected_targets):empty()); |
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110 end); |
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111 |
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112 it("supports A/AAAA fallback", function () |
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113 -- Many deployments don't have any SRV records, so we should |
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114 -- fall back to A/AAAA records instead when that is the case |
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115 |
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116 local expected_targets = set.new({ |
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117 -- xmpp0-a |
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118 "tcp4 127.0.0.97 5269"; |
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119 "tcp6 fdeb:9619:649e:c7d9::0097 5269"; |
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120 }); |
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121 local received_targets = set.new({}); |
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122 |
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123 local r = resolver.new("xmpp0-a.example.com", "xmpp-server", "tcp", { default_port = 5269 }); |
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124 local done = false; |
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125 local function handle_target(...) |
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126 if ... == nil then |
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127 done = true; |
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128 -- No more targets |
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129 return; |
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130 end |
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131 received_targets:add(table.concat({ ... }, " ", 1, 3)); |
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132 end |
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133 r:next(handle_target); |
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134 while not done do |
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135 r:next(handle_target); |
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136 end |
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137 |
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138 -- We should have received all expected targets, and no unexpected |
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139 -- ones: |
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140 assert.truthy(set.xor(received_targets, expected_targets):empty()); |
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141 end); |
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142 |
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143 |
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144 it("works", function () |
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145 local expected_targets = set.new({ |
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146 -- xmpp0-a |
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147 "tcp4 127.0.0.97 5228"; |
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148 "tcp6 fdeb:9619:649e:c7d9::0097 5228"; |
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149 "tcp4 127.0.0.97 5273"; |
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150 "tcp6 fdeb:9619:649e:c7d9::0097 5273"; |
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151 |
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152 -- xmpp0-b |
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153 "tcp4 127.0.0.98 5274"; |
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154 "tcp6 fdeb:9619:649e:c7d9::0098 5274"; |
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155 "tcp4 127.0.0.98 5216"; |
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156 "tcp6 fdeb:9619:649e:c7d9::0098 5216"; |
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157 |
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parents:
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158 -- xmpp0-c |
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159 "tcp4 127.0.0.99 5200"; |
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parents:
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160 "tcp6 fdeb:9619:649e:c7d9::0099 5200"; |
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parents:
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161 |
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parents:
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162 -- xmpp0-d |
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163 "tcp4 127.0.0.100 5256"; |
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parents:
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164 "tcp6 fdeb:9619:649e:c7d9::0100 5256"; |
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165 |
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parents:
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|
166 -- xmpp2 |
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|
167 "tcp4 127.0.0.49 5275"; |
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parents:
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168 "tcp6 fdeb:9619:649e:c7d9::0049 5275"; |
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|
169 |
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parents:
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170 }); |
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|
171 local received_targets = set.new({}); |
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172 |
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173 local r = resolver.new("example.com", "xmpp-server"); |
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parents:
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174 local done = false; |
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parents:
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|
175 local function handle_target(...) |
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|
176 if ... == nil then |
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177 done = true; |
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178 -- No more targets |
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179 return; |
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|
180 end |
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181 received_targets:add(table.concat({ ... }, " ", 1, 3)); |
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parents:
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|
182 end |
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183 r:next(handle_target); |
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|
184 while not done do |
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|
185 r:next(handle_target); |
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|
186 end |
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187 |
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188 -- We should have received all expected targets, and no unexpected |
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|
189 -- ones: |
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parents:
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|
190 assert.truthy(set.xor(received_targets, expected_targets):empty()); |
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parents:
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|
191 end); |
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parents:
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|
192 |
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parents:
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|
193 it("balances across weights correctly #slow", function () |
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parents:
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|
194 -- This mimics many repeated connections to 'example.com' (mock |
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parents:
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|
195 -- records defined above), and records the port number of the |
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parents:
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|
196 -- first target. Therefore it (should) only return priority |
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parents:
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|
197 -- 0 records, and the input data is constructed such that the |
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parents:
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|
198 -- last two digits of the port number represent the percentage |
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parents:
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|
199 -- of times that record should (on average) be picked first. |
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parents:
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|
200 |
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parents:
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|
201 -- To prevent random test failures, we test across a handful |
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parents:
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|
202 -- of fixed (randomly selected) seeds. |
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parents:
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|
203 for _, seed in ipairs({ 8401877, 3943829, 7830992 }) do |
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parents:
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|
204 math.randomseed(seed); |
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parents:
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|
205 |
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parents:
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|
206 local results = {}; |
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parents:
diff
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|
207 local function run() |
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parents:
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|
208 local run_results = {}; |
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parents:
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|
209 local r = resolver.new("example.com", "xmpp-server"); |
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parents:
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|
210 local function record_target(...) |
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parents:
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|
211 if ... == nil then |
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parents:
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|
212 -- No more targets |
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parents:
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|
213 return; |
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parents:
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|
214 end |
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parents:
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|
215 run_results = { ... }; |
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|
216 end |
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parents:
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|
217 r:next(record_target); |
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parents:
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|
218 return run_results[3]; |
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parents:
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|
219 end |
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parents:
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|
220 |
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parents:
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|
221 for _ = 1, 1000 do |
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parents:
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|
222 local port = run(); |
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parents:
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223 results[port] = (results[port] or 0) + 1; |
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parents:
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|
224 end |
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parents:
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|
225 |
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|
226 local ports = {}; |
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parents:
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|
227 for port in pairs(results) do |
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parents:
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|
228 table.insert(ports, port); |
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|
229 end |
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parents:
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|
230 table.sort(ports); |
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parents:
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|
231 for _, port in ipairs(ports) do |
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parents:
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|
232 --print("PORT", port, tostring((results[port]/1000) * 100).."% hits (expected "..tostring(port-5200).."%)"); |
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233 local hit_pct = (results[port]/1000) * 100; |
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parents:
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|
234 local expected_pct = port - 5200; |
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parents:
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|
235 --print(hit_pct, expected_pct, math.abs(hit_pct - expected_pct)); |
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parents:
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|
236 assert.is_true(math.abs(hit_pct - expected_pct) < 5); |
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parents:
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|
237 end |
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|
238 --print("---"); |
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parents:
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|
239 end |
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parents:
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|
240 end); |
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net.resolvers.service: Honour record 'weight' when picking SRV targets
Matthew Wild <mwild1@gmail.com>
parents:
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