Mercurial > prosody-modules

annotate mod_storage_appendmap/mod_storage_appendmap.lua @ 2635:4548c3d685b4

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mod_storage_appendmap: Successfully return nothing on ENOENT
author Kim Alvefur <zash@zash.se>
date Tue, 21 Mar 2017 15:56:43 +0100
parents 623e23190c3e
children 6a7b7cb7148e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2061
b84284144e21 mod_storage_appendmap: Experimental storage module optimized for map stores
Kim Alvefur <zash@zash.se>
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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 driver = {};
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6
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7 local map = {};
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8 local map_mt = { __index = map };
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9 map.remove = {};
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10
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11 function map:get(user, key)
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12 module:log("debug", "map:get(%s, %s)", tostring(user), tostring(key))
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13 local filename = dm.getpath(user, module.host, self.store, "map");
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14 module:log("debug", "File is %s", filename);
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15 local env = {};
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16 if _VERSION == "Lua 5.1" then -- HACK
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17 env._ENV = env; -- HACK
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18 end -- SO MANY HACKS
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19 local chunk, err, errno = load(filename, env);
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20 if not chunk then if errno == 2 then return end return chunk, err; end
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21 local ok, err = pcall(chunk);
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22 if not ok then return ok, err; end
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23 if _VERSION == "Lua 5.1" then -- HACK
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24 env._ENV = nil; -- HACK
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25 end -- HACKS EVERYWHERE
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26 if key == nil then
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27 return env;
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28 end
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29 return env[key];
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30 end
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31
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32 local keywords = {
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33 ["do"] = true; ["and"] = true; ["else"] = true; ["break"] = true;
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34 ["if"] = true; ["end"] = true; ["goto"] = true; ["false"] = true;
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35 ["in"] = true; ["for"] = true; ["then"] = true; ["local"] = true;
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36 ["or"] = true; ["nil"] = true; ["true"] = true; ["until"] = true;
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37 ["elseif"] = true; ["function"] = true; ["not"] = true;
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38 ["repeat"] = true; ["return"] = true; ["while"] = true;
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39
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40 -- _ENV is not technically a keyword but we need to treat it as such
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41 ["_ENV"] = true;
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42 };
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43
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44 function map:set_keys(user, keyvalues)
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45 local keys, values = {}, {};
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46 if _VERSION == "Lua 5.1" then
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47 assert(keyvalues._ENV == nil, "'_ENV' is a restricted key");
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48 end
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49 for key, value in pairs(keyvalues) do
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50 module:log("debug", "user %s sets %q to %s", user, key, tostring(value))
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51 if type(key) ~= "string" or not key:find("^[%a_][%w_]*$") or keywords[key] then
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52 key = "_ENV[" .. dump(key) .. "]";
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53 end
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54 table.insert(keys, key);
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55 if value == self.remove then
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56 table.insert(values, "nil")
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57 else
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58 table.insert(values, dump(value))
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59 end
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60 end
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61 local data = table.concat(keys, ", ") .. " = " .. table.concat(values, ", ") .. ";\n";
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62 return dm.append_raw(user, module.host, self.store, "map", data);
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63 end
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64
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65 function map:set(user, key, value)
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66 if _VERSION == "Lua 5.1" then
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67 assert(key ~= "_ENV", "'_ENV' is a restricted key");
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68 end
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69 if key == nil then
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70 local filename = dm.getpath(user, module.host, self.store, "map");
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71 os.remove(filename);
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72 return true;
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73 end
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74 if type(key) ~= "string" or not key:find("^[%w_][%w%d_]*$") or key == "_ENV" then
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75 key = "_ENV[" .. dump(key) .. "]";
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76 end
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77 local data = key .. " = " .. dump(value) .. ";\n";
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78 return dm.append_raw(user, module.host, self.store, "map", data);
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79 end
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80
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81 local keyval = {};
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82 local keyval_mt = { __index = keyval };
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83
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84 function keyval:get(user)
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85 return map.get(self, user);
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86 end
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87
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88 function keyval:set(user, data)
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89 map.set(self, user);
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90 if data then
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91 for k, v in pairs(data) do
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92 map.set(self, user, k, v);
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93 end
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94 end
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95 return true;
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96 end
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97
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98 -- TODO some kind of periodic compaction thing?
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99 function map:_compact(user)
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100 local data = self:get(user);
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101 return keyval.set(self, user, data);
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102 end
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103
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104 function driver:open(store, typ)
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105 if typ == "map" then
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106 return setmetatable({ store = store, }, map_mt);
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107 elseif typ == nil or typ == "keyval" then
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108 return setmetatable({ store = store, }, keyval_mt);
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109 end
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110 return nil, "unsupported-store";
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111 end
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112
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113 module:provides("storage", driver);
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114