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mod_storage_appendmap/mod_storage_appendmap.lua

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mod_storage_appendmap/mod_storage_appendmap.lua @ 5941:5c4e102e2563 default tip

mod_pubsub_serverinfo: fix bool logic when reading config
author Guus der Kinderen <guus.der.kinderen@gmail.com>
date Mon, 03 Jun 2024 12:52:26 +0200
parent 5714:78f766372e2c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local dump = require "util.serialization".serialize;
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2 local load = require "util.envload".envloadfile;
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3 local datetime = require "util.datetime".datetime;
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4 local dm = require "core.storagemanager".olddm;
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5
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6 local REMOVE = {}; -- Special value for removing keys
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7
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8 local driver = {};
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9
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10 local timestamps = module:get_option_boolean("appendmap_timestamps", true);
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11
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12 local keywords = {
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13 ["do"] = true; ["and"] = true; ["else"] = true; ["break"] = true;
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14 ["if"] = true; ["end"] = true; ["goto"] = true; ["false"] = true;
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15 ["in"] = true; ["for"] = true; ["then"] = true; ["local"] = true;
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16 ["or"] = true; ["nil"] = true; ["true"] = true; ["until"] = true;
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17 ["elseif"] = true; ["function"] = true; ["not"] = true;
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18 ["repeat"] = true; ["return"] = true; ["while"] = true;
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19
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20 -- _ENV is not technically a keyword but we need to treat it as such
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21 ["_ENV"] = true;
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22 };
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23
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24 local function is_usable_identifier(s)
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25 return type(s) == "string" and not keywords[s] and s:find("^[%a_][%w_]*$");
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26 end
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27
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28 local function serialize_key(key)
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29 if is_usable_identifier(key) then
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30 return key;
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31 else
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32 return "_ENV[" .. dump(key) .. "]";
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33 end
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34 end
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35
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36 local function serialize_value(value)
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37 if value == REMOVE then
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38 return "nil";
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39 else
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40 return dump(value);
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41 end
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42 end
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43
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44 local function serialize_pair(key, value)
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45 key = serialize_key(key);
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46 value = serialize_value(value);
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47 return key .. " = " .. value .. ";\n";
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48 end
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49
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50 local function serialize_map(keyvalues)
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51 local keys, values = {}, {};
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52 for key, value in pairs(keyvalues) do
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53 key = serialize_key(key);
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54 value = serialize_value(value);
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55 table.insert(keys, key);
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56 table.insert(values, value);
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57 end
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58 return table.concat(keys, ", ") .. " = " .. table.concat(values, ", ") .. ";\n";
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59 end
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60
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61 local map = { remove = REMOVE };
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62 local map_mt = { __index = map };
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63
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64 function map:get(user, key)
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65 module:log("debug", "map:get(%s, %s)", tostring(user), tostring(key))
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66 local filename = dm.getpath(user, module.host, self.store, "map");
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67 module:log("debug", "File is %s", filename);
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68 local env = {};
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69 if _VERSION == "Lua 5.1" then -- HACK
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70 env._ENV = env; -- HACK
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71 end -- SO MANY HACKS
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72 local chunk, err, errno = load(filename, env);
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73 if not chunk then if errno == 2 then return end return chunk, err; end
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74 local ok, err = pcall(chunk);
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75 if not ok then return ok, err; end
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76 if _VERSION == "Lua 5.1" then -- HACK
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77 env._ENV = nil; -- HACK
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78 end -- HACKS EVERYWHERE
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79 if key == nil then
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80 return env;
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81 end
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82 return env[key];
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83 end
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84
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85 function map:set_keys(user, keyvalues)
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86 local data = serialize_map(keyvalues);
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87 if timestamps then
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88 data = "-- " .. datetime() .. "\n" .. data;
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89 end
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90 return dm.append_raw(user, module.host, self.store, "map", data);
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91 end
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92
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93 function map:set(user, key, value)
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94 if _VERSION == "Lua 5.1" then
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95 assert(key ~= "_ENV", "'_ENV' is a restricted key");
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96 end
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97 if key == nil then
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98 local filename = dm.getpath(user, module.host, self.store, "map");
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99 return os.remove(filename);
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100 end
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101 local data = serialize_pair(key, value);
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102 if timestamps then
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103 data = "-- " .. datetime() .. "\n" .. data;
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104 end
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105 return dm.append_raw(user, module.host, self.store, "map", data);
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106 end
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107
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108 function map:items()
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109 return dm.users(module.host, self.store, "map");
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110 end
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111
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112 local keyval = { remove = REMOVE };
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113 local keyval_mt = { __index = keyval };
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114
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115 function keyval:get(user)
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116 return map.get(self, user, nil);
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117 end
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118
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119 function keyval:set(user, keyvalues)
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120 local data = serialize_map(keyvalues);
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121 if timestamps then
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122 data = "-- " .. datetime() .. "\n" .. data;
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123 end
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124 return dm.store_raw(dm.getpath(user, module.host, self.store, "map"), data);
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125 end
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126
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127 function keyval:users()
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128 return dm.users(module.host, self.store, "map");
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129 end
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130
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131 -- TODO some kind of periodic compaction thing?
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132 function map:_compact(user)
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133 local data = self:get(user);
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134 return keyval.set(self, user, data);
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135 end
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136
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137 function driver:open(store, typ)
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138 if typ == "map" then
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139 return setmetatable({ store = store, }, map_mt);
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140 elseif typ == nil or typ == "keyval" then
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141 return setmetatable({ store = store, }, keyval_mt);
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142 end
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143 return nil, "unsupported-store";
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144 end
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145
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146 module:provides("storage", driver);
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147