prosody
9c4dc1e6d2c9
util/fsm.lua

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util/fsm.lua @ 13107:9c4dc1e6d2c9

mod_http: Add way to retrieve internal URL instead of external This could be of help when configuring reverse proxies, as it is the internal URL the proxy must point at. Argument treated as an enum "internal" "external"(default) to allow for future extensibility.
author Kim Alvefur <zash@zash.se>
date Wed, 24 May 2023 14:43:45 +0200
parent 13019:8a2f75e38eb2
child 13165:9c13c11b199d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
13019
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1 local events = require "util.events";
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2
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3 local fsm_methods = {};
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4 local fsm_mt = { __index = fsm_methods };
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5
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6 local function is_fsm(o)
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7 local mt = getmetatable(o);
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8 return mt == fsm_mt;
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9 end
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10
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11 local function notify_transition(fire_event, transition_event)
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12 local ret;
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13 ret = fire_event("transition", transition_event);
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14 if ret ~= nil then return ret; end
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15 if transition_event.from ~= transition_event.to then
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16 ret = fire_event("leave/"..transition_event.from, transition_event);
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17 if ret ~= nil then return ret; end
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18 end
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19 ret = fire_event("transition/"..transition_event.name, transition_event);
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20 if ret ~= nil then return ret; end
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21 end
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22
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23 local function notify_transitioned(fire_event, transition_event)
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24 if transition_event.to ~= transition_event.from then
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25 fire_event("enter/"..transition_event.to, transition_event);
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26 end
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27 if transition_event.name then
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28 fire_event("transitioned/"..transition_event.name, transition_event);
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29 end
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30 fire_event("transitioned", transition_event);
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31 end
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32
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33 local function do_transition(name)
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34 return function (self, attr)
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35 local new_state = self.fsm.states[self.state][name] or self.fsm.states["*"][name];
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36 if not new_state then
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37 return error(("Invalid state transition: %s cannot %s"):format(self.state, name));
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38 end
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39
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40 local transition_event = {
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41 instance = self;
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42
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43 name = name;
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44 to = new_state;
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45 to_attr = attr;
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46
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47 from = self.state;
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48 from_attr = self.state_attr;
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49 };
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50
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51 local fire_event = self.fsm.events.fire_event;
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52 local ret = notify_transition(fire_event, transition_event);
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53 if ret ~= nil then return nil, ret; end
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54
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55 self.state = new_state;
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56 self.state_attr = attr;
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57
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58 notify_transitioned(fire_event, transition_event);
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59 return true;
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60 end;
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61 end
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62
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63 local function new(desc)
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64 local self = setmetatable({
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65 default_state = desc.default_state;
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66 events = events.new();
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67 }, fsm_mt);
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68
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69 -- states[state_name][transition_name] = new_state_name
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70 local states = { ["*"] = {} };
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71 if desc.default_state then
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72 states[desc.default_state] = {};
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73 end
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74 self.states = states;
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75
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76 local instance_methods = {};
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77 self._instance_mt = { __index = instance_methods };
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78
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79 for _, transition in ipairs(desc.transitions or {}) do
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80 local from_states = transition.from;
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81 if type(from_states) ~= "table" then
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82 from_states = { from_states };
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83 end
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84 for _, from in ipairs(from_states) do
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85 if not states[from] then
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86 states[from] = {};
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87 end
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88 if not states[transition.to] then
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89 states[transition.to] = {};
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90 end
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91 if states[from][transition.name] then
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92 return error(("Duplicate transition in FSM specification: %s from %s"):format(transition.name, from));
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93 end
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94 states[from][transition.name] = transition.to;
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95 end
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96
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97 -- Add public method to trigger this transition
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98 instance_methods[transition.name] = do_transition(transition.name);
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99 end
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100
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101 if desc.state_handlers then
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102 for state_name, handler in pairs(desc.state_handlers) do
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103 self.events.add_handler("enter/"..state_name, handler);
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104 end
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105 end
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106
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107 if desc.transition_handlers then
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108 for transition_name, handler in pairs(desc.transition_handlers) do
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109 self.events.add_handler("transition/"..transition_name, handler);
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110 end
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111 end
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112
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113 if desc.handlers then
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114 self.events.add_handlers(desc.handlers);
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115 end
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116
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117 return self;
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118 end
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119
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120 function fsm_methods:init(state_name, state_attr)
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121 local initial_state = assert(state_name or self.default_state, "no initial state specified");
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122 if not self.states[initial_state] then
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123 return error("Invalid initial state: "..initial_state);
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124 end
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125 local instance = setmetatable({
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126 fsm = self;
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127 state = initial_state;
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128 state_attr = state_attr;
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129 }, self._instance_mt);
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130
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131 if initial_state ~= self.default_state then
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132 local fire_event = self.events.fire_event;
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133 notify_transitioned(fire_event, {
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134 instance = instance;
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135
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136 to = initial_state;
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137 to_attr = state_attr;
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138
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139 from = self.default_state;
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140 });
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141 end
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142
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143 return instance;
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144 end
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145
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146 function fsm_methods:is_instance(o)
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147 local mt = getmetatable(o);
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148 return mt == self._instance_mt;
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149 end
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150
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151 return {
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152 new = new;
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153 is_fsm = is_fsm;
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154 };