view mod_storage_appendmap/mod_storage_appendmap.lua @ 5468:14b5446e22e1

mod_http_oauth2: Fix returning errors from response handlers This would either redirect the user back to the client along with the error code, or show the error HTML template. Previously this would just show some JSON to the user.
author Kim Alvefur <zash@zash.se>
date Thu, 18 May 2023 12:57:23 +0200
parents e44b868cc575
children ea6c18ec0669
line wrap: on
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local dump = require "util.serialization".serialize;
local load = require "util.envload".envloadfile;
local dm = require "core.storagemanager".olddm;

local REMOVE = {}; -- Special value for removing keys

local driver = {};


local keywords = {
	["do"] = true; ["and"] = true; ["else"] = true; ["break"] = true;
	["if"] = true; ["end"] = true; ["goto"] = true; ["false"] = true;
	["in"] = true; ["for"] = true; ["then"] = true; ["local"] = true;
	["or"] = true; ["nil"] = true; ["true"] = true; ["until"] = true;
	["elseif"] = true; ["function"] = true; ["not"] = true;
	["repeat"] = true; ["return"] = true; ["while"] = true;

	-- _ENV is not technically a keyword but we need to treat it as such
	["_ENV"] = true;
};

local function is_usable_identifier(s)
	return type(s) == "string" and not keywords[s] and s:find("^[%a_][%w_]*$");
end

local function serialize_key(key)
	if is_usable_identifier(key) then
		return key;
	else
		return "_ENV[" .. dump(key) .. "]";
	end
end

local function serialize_value(value)
	if value == REMOVE then
		return "nil";
	else
		return dump(value);
	end
end

local function serialize_pair(key, value)
	key = serialize_key(key);
	value = serialize_value(value);
	return key .. " = " .. value .. ";\n";
end

local function serialize_map(keyvalues)
	local keys, values = {}, {};
	for key, value in pairs(keyvalues) do
		key = serialize_key(key);
		value = serialize_value(value);
		table.insert(keys, key);
		table.insert(values, value);
	end
	return table.concat(keys, ", ") .. " = " .. table.concat(values, ", ") .. ";\n";
end

local map = { remove = REMOVE };
local map_mt = { __index = map };

function map:get(user, key)
	module:log("debug", "map:get(%s, %s)", tostring(user), tostring(key))
	local filename = dm.getpath(user, module.host, self.store, "map");
	module:log("debug", "File is %s", filename);
	local env = {};
	if _VERSION == "Lua 5.1" then -- HACK
		env._ENV = env; -- HACK
	end -- SO MANY HACKS
	local chunk, err, errno = load(filename, env);
	if not chunk then if errno == 2 then return end return chunk, err; end
	local ok, err = pcall(chunk);
	if not ok then return ok, err; end
	if _VERSION == "Lua 5.1" then -- HACK
		env._ENV = nil; -- HACK
	end -- HACKS EVERYWHERE
	if key == nil then
		return env;
	end
	return env[key];
end

function map:set_keys(user, keyvalues)
	local data = serialize_map(keyvalues);
	return dm.append_raw(user, module.host, self.store, "map", data);
end

function map:set(user, key, value)
	if _VERSION == "Lua 5.1" then
		assert(key ~= "_ENV", "'_ENV' is a restricted key");
	end
	if key == nil then
		local filename = dm.getpath(user, module.host, self.store, "map");
		return os.remove(filename);
	end
	local data = serialize_pair(key, value);
	return dm.append_raw(user, module.host, self.store, "map", data);
end

local keyval = { remove = REMOVE };
local keyval_mt = { __index = keyval };

function keyval:get(user)
	return map.get(self, user, nil);
end

function keyval:set(user, keyvalues)
	local data = serialize_map(keyvalues);
	return dm.store_raw(dm.getpath(user, module.host, self.store, "map"), data);
end

-- TODO some kind of periodic compaction thing?
function map:_compact(user)
	local data = self:get(user);
	return keyval.set(self, user, data);
end

function driver:open(store, typ)
	if typ == "map" then
		return setmetatable({ store = store, }, map_mt);
	elseif typ == nil or typ == "keyval" then
		return setmetatable({ store = store, }, keyval_mt);
	end
	return nil, "unsupported-store";
end

module:provides("storage", driver);