Mercurial > prosody-modules
annotate mod_storage_appendmap/mod_storage_appendmap.lua @ 2968:569b98d6fca1
mod_http_logging: Be robust against missing connection object
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 30 Mar 2018 13:37:39 +0200 |
parents | 6a7b7cb7148e |
children | e44b868cc575 |
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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 |