prosody-modules
0f5f2d4475b9
mod_storage_appendmap/mod_storage_appendmap.lua

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mod_storage_appendmap/mod_storage_appendmap.lua @ 4876:0f5f2d4475b9

mod_http_xep227: Add support for import via APIs rather than direct store manipulation In particular this transitions PEP nodes and data to be imported via mod_pep's APIs, fixing issues with importing at runtime while PEP data may already be live in RAM. Next obvious candidate for this approach is rosters, so clients get immediate roster pushes and other special handling (such as emitting subscribes to reach the desired subscription state).
author Matthew Wild <mwild1@gmail.com>
date Tue, 18 Jan 2022 17:01:18 +0000
parent 2796:6a7b7cb7148e
child 5061:e44b868cc575
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 dm = require "core.storagemanager".olddm;
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4
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5 local REMOVE = {}; -- Special value for removing keys
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6
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7 local driver = {};
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8
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9
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10 local keywords = {
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11 ["do"] = true; ["and"] = true; ["else"] = true; ["break"] = true;
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12 ["if"] = true; ["end"] = true; ["goto"] = true; ["false"] = true;
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13 ["in"] = true; ["for"] = true; ["then"] = true; ["local"] = true;
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14 ["or"] = true; ["nil"] = true; ["true"] = true; ["until"] = true;
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15 ["elseif"] = true; ["function"] = true; ["not"] = true;
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16 ["repeat"] = true; ["return"] = true; ["while"] = true;
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17
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18 -- _ENV is not technically a keyword but we need to treat it as such
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19 ["_ENV"] = true;
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20 };
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21
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22 local function is_usable_identifier(s)
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23 return type(s) == "string" and not keywords[s] and s:find("^[%a_][%w_]*$");
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24 end
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25
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26 local function serialize_key(key)
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27 if is_usable_identifier(key) then
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28 return key;
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29 else
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30 return "_ENV[" .. dump(key) .. "]";
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31 end
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32 end
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33
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34 local function serialize_value(value)
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35 if value == REMOVE then
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36 return "nil";
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37 else
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38 return dump(value);
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39 end
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40 end
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41
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42 local function serialize_pair(key, value)
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43 key = serialize_key(key);
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44 value = serialize_value(value);
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45 return key .. " = " .. value .. ";\n";
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46 end
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47
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48 local function serialize_map(keyvalues)
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49 local keys, values = {}, {};
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50 for key, value in pairs(keyvalues) do
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51 key = serialize_key(key);
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52 value = serialize_value(value);
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53 table.insert(keys, key);
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54 table.insert(values, value);
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55 end
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56 return table.concat(keys, ", ") .. " = " .. table.concat(values, ", ") .. ";\n";
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57 end
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58
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59 local map = { remove = REMOVE };
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60 local map_mt = { __index = map };
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61
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62 function map:get(user, key)
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63 module:log("debug", "map:get(%s, %s)", tostring(user), tostring(key))
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64 local filename = dm.getpath(user, module.host, self.store, "map");
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65 module:log("debug", "File is %s", filename);
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66 local env = {};
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67 if _VERSION == "Lua 5.1" then -- HACK
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68 env._ENV = env; -- HACK
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69 end -- SO MANY HACKS
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70 local chunk, err, errno = load(filename, env);
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71 if not chunk then if errno == 2 then return end return chunk, err; end
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72 local ok, err = pcall(chunk);
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73 if not ok then return ok, err; end
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74 if _VERSION == "Lua 5.1" then -- HACK
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75 env._ENV = nil; -- HACK
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76 end -- HACKS EVERYWHERE
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77 if key == nil then
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78 return env;
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79 end
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80 return env[key];
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81 end
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82
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83 function map:set_keys(user, keyvalues)
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84 local data = serialize_map(keyvalues);
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85 return dm.append_raw(user, module.host, self.store, "map", data);
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86 end
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87
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88 function map:set(user, key, value)
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89 if _VERSION == "Lua 5.1" then
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90 assert(key ~= "_ENV", "'_ENV' is a restricted key");
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91 end
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92 if key == nil then
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93 local filename = dm.getpath(user, module.host, self.store, "map");
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94 return os.remove(filename);
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95 end
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96 local data = serialize_pair(key, value);
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97 return dm.append_raw(user, module.host, self.store, "map", data);
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98 end
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99
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100 local keyval = { remove = REMOVE };
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101 local keyval_mt = { __index = keyval };
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102
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103 function keyval:get(user)
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104 return map.get(self, user, nil);
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105 end
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106
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107 function keyval:set(user, keyvalues)
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108 local data = serialize_map(keyvalues);
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109 return dm.store_raw(user, module.host, self.store, "map", data);
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110 end
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111
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112 -- TODO some kind of periodic compaction thing?
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113 function map:_compact(user)
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114 local data = self:get(user);
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115 return keyval.set(self, user, data);
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116 end
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117
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118 function driver:open(store, typ)
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119 if typ == "map" then
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120 return setmetatable({ store = store, }, map_mt);
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121 elseif typ == nil or typ == "keyval" then
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122 return setmetatable({ store = store, }, keyval_mt);
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123 end
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124 return nil, "unsupported-store";
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125 end
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126
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127 module:provides("storage", driver);
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128