author | Kim Alvefur <zash@zash.se> |
Sat, 25 Jan 2020 01:31:49 +0100 | |
changeset 3861 | 8752e5b5dd08 |
parent 2800 | 6a7b7cb7148e |
child 5065 | e44b868cc575 |
permissions | -rw-r--r-- |
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local dump = require "util.serialization".serialize; |
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local load = require "util.envload".envloadfile; |
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local dm = require "core.storagemanager".olddm; |
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local REMOVE = {}; -- Special value for removing keys |
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local driver = {}; |
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local keywords = { |
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["do"] = true; ["and"] = true; ["else"] = true; ["break"] = true; |
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["if"] = true; ["end"] = true; ["goto"] = true; ["false"] = true; |
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["in"] = true; ["for"] = true; ["then"] = true; ["local"] = true; |
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["or"] = true; ["nil"] = true; ["true"] = true; ["until"] = true; |
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["elseif"] = true; ["function"] = true; ["not"] = true; |
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["repeat"] = true; ["return"] = true; ["while"] = true; |
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-- _ENV is not technically a keyword but we need to treat it as such |
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["_ENV"] = true; |
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}; |
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local function is_usable_identifier(s) |
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return type(s) == "string" and not keywords[s] and s:find("^[%a_][%w_]*$"); |
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end |
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local function serialize_key(key) |
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if is_usable_identifier(key) then |
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return key; |
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else |
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return "_ENV[" .. dump(key) .. "]"; |
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end |
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end |
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local function serialize_value(value) |
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if value == REMOVE then |
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return "nil"; |
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else |
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return dump(value); |
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end |
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end |
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local function serialize_pair(key, value) |
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key = serialize_key(key); |
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value = serialize_value(value); |
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return key .. " = " .. value .. ";\n"; |
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end |
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local function serialize_map(keyvalues) |
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local keys, values = {}, {}; |
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for key, value in pairs(keyvalues) do |
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key = serialize_key(key); |
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value = serialize_value(value); |
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table.insert(keys, key); |
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table.insert(values, value); |
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end |
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return table.concat(keys, ", ") .. " = " .. table.concat(values, ", ") .. ";\n"; |
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end |
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local map = { remove = REMOVE }; |
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local map_mt = { __index = map }; |
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function map:get(user, key) |
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module:log("debug", "map:get(%s, %s)", tostring(user), tostring(key)) |
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local filename = dm.getpath(user, module.host, self.store, "map"); |
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module:log("debug", "File is %s", filename); |
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local env = {}; |
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if _VERSION == "Lua 5.1" then -- HACK |
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env._ENV = env; -- HACK |
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end -- SO MANY HACKS |
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local chunk, err, errno = load(filename, env); |
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if not chunk then if errno == 2 then return end return chunk, err; end |
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local ok, err = pcall(chunk); |
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if not ok then return ok, err; end |
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if _VERSION == "Lua 5.1" then -- HACK |
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env._ENV = nil; -- HACK |
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end -- HACKS EVERYWHERE |
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if key == nil then |
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return env; |
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end |
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return env[key]; |
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end |
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function map:set_keys(user, keyvalues) |
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local data = serialize_map(keyvalues); |
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return dm.append_raw(user, module.host, self.store, "map", data); |
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end |
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|
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function map:set(user, key, value) |
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if _VERSION == "Lua 5.1" then |
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assert(key ~= "_ENV", "'_ENV' is a restricted key"); |
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end |
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if key == nil then |
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local filename = dm.getpath(user, module.host, self.store, "map"); |
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return os.remove(filename); |
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end |
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local data = serialize_pair(key, value); |
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return dm.append_raw(user, module.host, self.store, "map", data); |
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end |
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local keyval = { remove = REMOVE }; |
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local keyval_mt = { __index = keyval }; |
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function keyval:get(user) |
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return map.get(self, user, nil); |
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end |
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function keyval:set(user, keyvalues) |
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local data = serialize_map(keyvalues); |
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return dm.store_raw(user, module.host, self.store, "map", data); |
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end |
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-- TODO some kind of periodic compaction thing? |
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function map:_compact(user) |
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local data = self:get(user); |
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return keyval.set(self, user, data); |
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end |
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function driver:open(store, typ) |
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if typ == "map" then |
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return setmetatable({ store = store, }, map_mt); |
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elseif typ == nil or typ == "keyval" then |
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return setmetatable({ store = store, }, keyval_mt); |
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end |
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return nil, "unsupported-store"; |
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end |
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module:provides("storage", driver); |
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128 |