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annotate mod_storage_appendmap/mod_storage_appendmap.lua @ 2249:d3e697c141e4

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mod_cloud_notify/README: Let's call it Beta
author Kim Alvefur <zash@zash.se>
date Tue, 26 Jul 2016 11:49:49 +0200
parents 98354fbea63c
children a2625a36c092
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b84284144e21 mod_storage_appendmap: Experimental storage module optimized for map stores
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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 = load(filename, env);
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20 if not chunk then 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 function map:set_keys(user, keyvalues)
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33 local keys, values = {}, {};
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34 if _VERSION == "Lua 5.1" then
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35 assert(keyvalues._ENV == nil, "'_ENV' is a restricted key");
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36 end
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37 for key, value in pairs(keyvalues) do
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38 module:log("debug", "user %s sets %q to %s", user, key, tostring(value))
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39 if type(key) ~= "string" or not key:find("^[%w_][%w%d_]*$") or key == "_ENV" then
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40 key = "_ENV[" .. dump(key) .. "]";
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41 end
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42 table.insert(keys, key);
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43 if value == self.remove then
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44 table.insert(values, "nil")
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45 else
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46 table.insert(values, dump(value))
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47 end
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48 end
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49 local data = table.concat(keys, ", ") .. " = " .. table.concat(values, ", ") .. ";\n";
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50 return dm.append_raw(user, module.host, self.store, "map", data);
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51 end
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52
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53 function map:set(user, key, value)
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54 if _VERSION == "Lua 5.1" then
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55 assert(key ~= "_ENV", "'_ENV' is a restricted key");
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56 end
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57 if key == nil then
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58 local filename = dm.getpath(user, module.host, self.store, "map");
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59 os.remove(filename);
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60 return true;
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61 end
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62 if type(key) ~= "string" or not key:find("^[%w_][%w%d_]*$") or key == "_ENV" then
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63 key = "_ENV[" .. dump(key) .. "]";
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64 end
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65 local data = key .. " = " .. dump(value) .. ";\n";
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66 return dm.append_raw(user, module.host, self.store, "map", data);
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67 end
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68
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69 local keyval = {};
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70 local keyval_mt = { __index = keyval };
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71
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72 function keyval:get(user)
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73 return map.get(self, user);
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74 end
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75
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76 function keyval:set(user, data)
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77 map.set(self, user);
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78 if data then
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79 for k, v in pairs(data) do
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80 map.set(self, user, k, v);
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81 end
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82 end
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83 return true;
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84 end
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85
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86 -- TODO some kind of periodic compaction thing?
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87 function map:_compact(user)
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88 local data = self:get(user);
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89 return keyval.set(self, user, data);
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90 end
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91
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92 function driver:open(store, typ)
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93 if typ == "map" then
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94 return setmetatable({ store = store, }, map_mt);
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95 elseif typ == nil or typ == "keyval" then
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96 return setmetatable({ store = store, }, keyval_mt);
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97 end
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98 return nil, "unsupported-store";
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99 end
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100
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101 module:provides("storage", driver);
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102