prosody
9970d333a63f
spec/util_throttle_spec.lua

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spec/util_throttle_spec.lua @ 13532:9970d333a63f

mod_pubsub: Use error registry This is what util.error was made for! This replaces the custom error stanza builder with common code in util.stanza that knows enough about util.error and namespaced errors. Some awkwardness remains in the way util.pubsub returns conflicting form fields.
author Kim Alvefur <zash@zash.se>
date Sun, 27 Oct 2024 15:18:24 +0100
parent 13399:f4415f76727b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 -- luacheck: ignore 411/a
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3
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4 -- Mock util.time
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5 local now = 0; -- wibbly-wobbly... timey-wimey... stuff
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6 local function later(n)
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7 now = now + n; -- time passes at a different rate
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8 end
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9 package.loaded["util.time"] = {
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10 now = function() return now; end
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11 }
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14 local throttle = require "util.throttle";
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16 describe("util.throttle", function()
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17 describe("#create()", function()
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18 it("should be created with correct values", function()
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19 now = 5;
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20 local a = throttle.create(3, 10);
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21 assert.same(a, { balance = 3, max = 3, rate = 0.3, t = 5 });
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23 local a = throttle.create(3, 5);
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24 assert.same(a, { balance = 3, max = 3, rate = 0.6, t = 5 });
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26 local a = throttle.create(1, 1);
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27 assert.same(a, { balance = 1, max = 1, rate = 1, t = 5 });
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29 local a = throttle.create(10, 10);
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30 assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 });
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32 local a = throttle.create(10, 1);
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33 assert.same(a, { balance = 10, max = 10, rate = 10, t = 5 });
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34 end);
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35 end);
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36
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37 describe("#update()", function()
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38 it("does nothing when no time has passed, even if balance is not full", function()
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39 now = 5;
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40 local a = throttle.create(10, 10);
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41 for i=1,5 do
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42 a:update();
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43 assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 });
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44 end
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45 a.balance = 0;
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46 for i=1,5 do
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47 a:update();
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48 assert.same(a, { balance = 0, max = 10, rate = 1, t = 5 });
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49 end
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50 end);
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51 it("updates only time when time passes but balance is full", function()
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52 now = 5;
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53 local a = throttle.create(10, 10);
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54 for i=1,5 do
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55 later(5);
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56 a:update();
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57 assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 + i*5 });
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58 end
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59 end);
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60 it("updates balance when balance has room to grow as time passes", function()
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61 now = 5;
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62 local a = throttle.create(10, 10);
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63 a.balance = 0;
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64 assert.same(a, { balance = 0, max = 10, rate = 1, t = 5 });
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65
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66 later(1);
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67 a:update();
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68 assert.same(a, { balance = 1, max = 10, rate = 1, t = 6 });
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69
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70 later(3);
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71 a:update();
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72 assert.same(a, { balance = 4, max = 10, rate = 1, t = 9 });
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73
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74 later(10);
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75 a:update();
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76 assert.same(a, { balance = 10, max = 10, rate = 1, t = 19 });
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77 end);
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78 it("handles 10 x 0.1s updates the same as 1 x 1s update ", function()
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79 now = 5;
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80 local a = throttle.create(1, 1);
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81
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82 a.balance = 0;
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83 later(1);
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84 a:update();
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85 assert.same(a, { balance = 1, max = 1, rate = 1, t = now });
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86
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87 a.balance = 0;
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88 for i=1,10 do
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89 later(0.1);
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90 a:update();
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91 end
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92 assert(math.abs(a.balance - 1) < 0.0001); -- incremental updates cause rounding errors
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93 end);
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94 end);
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95
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96 -- describe("po")
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97
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98 describe("#poll()", function()
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99 it("should only allow successful polls until cost is hit", function()
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100 now = 5;
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101
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102 local a = throttle.create(3, 10);
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103 assert.same(a, { balance = 3, max = 3, rate = 0.3, t = 5 });
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104
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105 assert.is_true(a:poll(1)); -- 3 -> 2
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106 assert.same(a, { balance = 2, max = 3, rate = 0.3, t = 5 });
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107
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108 assert.is_true(a:poll(2)); -- 2 -> 1
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109 assert.same(a, { balance = 0, max = 3, rate = 0.3, t = 5 });
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110
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111 assert.is_false(a:poll(1)); -- MEEP, out of credits!
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112 assert.is_false(a:poll(1)); -- MEEP, out of credits!
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113 assert.same(a, { balance = 0, max = 3, rate = 0.3, t = 5 });
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114 end);
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115
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116 it("should not allow polls more than the cost", function()
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117 now = 0;
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118
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119 local a = throttle.create(10, 10);
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120 assert.same(a, { balance = 10, max = 10, rate = 1, t = 0 });
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121
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122 assert.is_false(a:poll(11));
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123 assert.same(a, { balance = 10, max = 10, rate = 1, t = 0 });
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124
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125 assert.is_true(a:poll(6));
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126 assert.same(a, { balance = 4, max = 10, rate = 1, t = 0 });
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127
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128 assert.is_false(a:poll(5));
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129 assert.same(a, { balance = 4, max = 10, rate = 1, t = 0 });
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130
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131 -- fractional
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132 assert.is_true(a:poll(3.5));
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133 assert.same(a, { balance = 0.5, max = 10, rate = 1, t = 0 });
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134
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135 assert.is_true(a:poll(0.25));
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136 assert.same(a, { balance = 0.25, max = 10, rate = 1, t = 0 });
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137
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138 assert.is_false(a:poll(0.3));
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139 assert.same(a, { balance = 0.25, max = 10, rate = 1, t = 0 });
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140
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141 assert.is_true(a:poll(0.25));
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142 assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });
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143
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144 assert.is_false(a:poll(0.1));
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145 assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });
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146
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147 assert.is_true(a:poll(0));
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148 assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });
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149 end);
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150 end);
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151 end);