prosody
8a2f75e38eb2
util/fsm.lua

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util/fsm.lua @ 13019:8a2f75e38eb2

util.fsm: New utility lib for finite state machines
author Matthew Wild <mwild1@gmail.com>
date Thu, 17 Mar 2022 17:45:27 +0000
child 13165:9c13c11b199d
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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 };