File

util/sqlite3.lua @ 13107:9c4dc1e6d2c9

mod_http: Add way to retrieve internal URL instead of external This could be of help when configuring reverse proxies, as it is the internal URL the proxy must point at. Argument treated as an enum "internal" "external"(default) to allow for future extensibility.
author Kim Alvefur <zash@zash.se>
date Wed, 24 May 2023 14:43:45 +0200
parent 12975:d10957394a3c
child 13145:af251471d5ae
line wrap: on
line source


-- luacheck: ignore 113/unpack 211 212 411 213
local setmetatable, getmetatable = setmetatable, getmetatable;
local ipairs, unpack, select = ipairs, table.unpack or unpack, select;
local tonumber, tostring = tonumber, tostring;
local assert, xpcall, debug_traceback = assert, xpcall, debug.traceback;
local error = error
local type = type
local t_concat = table.concat;
local t_insert = table.insert;
local s_char = string.char;
local log = require "prosody.util.logger".init("sql");

local lsqlite3 = require "lsqlite3";
local build_url = require "socket.url".build;
local ROW, DONE = lsqlite3.ROW, lsqlite3.DONE;

-- from sqlite3.h, no copyright claimed
local sqlite_errors = require"prosody.util.error".init("util.sqlite3", {
	-- FIXME xmpp error conditions?
	[1] = { code = 1;     type = "modify";   condition = "ERROR";      text = "Generic error" };
	[2] = { code = 2;     type = "cancel";   condition = "INTERNAL";   text = "Internal logic error in SQLite" };
	[3] = { code = 3;     type = "auth";     condition = "PERM";       text = "Access permission denied" };
	[4] = { code = 4;     type = "cancel";   condition = "ABORT";      text = "Callback routine requested an abort" };
	[5] = { code = 5;     type = "wait";     condition = "BUSY";       text = "The database file is locked" };
	[6] = { code = 6;     type = "wait";     condition = "LOCKED";     text = "A table in the database is locked" };
	[7] = { code = 7;     type = "wait";     condition = "NOMEM";      text = "A malloc() failed" };
	[8] = { code = 8;     type = "cancel";   condition = "READONLY";   text = "Attempt to write a readonly database" };
	[9] = { code = 9;     type = "cancel";   condition = "INTERRUPT";  text = "Operation terminated by sqlite3_interrupt()" };
	[10] = { code = 10;   type = "wait";     condition = "IOERR";      text = "Some kind of disk I/O error occurred" };
	[11] = { code = 11;   type = "cancel";   condition = "CORRUPT";    text = "The database disk image is malformed" };
	[12] = { code = 12;   type = "modify";   condition = "NOTFOUND";   text = "Unknown opcode in sqlite3_file_control()" };
	[13] = { code = 13;   type = "wait";     condition = "FULL";       text = "Insertion failed because database is full" };
	[14] = { code = 14;   type = "auth";     condition = "CANTOPEN";   text = "Unable to open the database file" };
	[15] = { code = 15;   type = "cancel";   condition = "PROTOCOL";   text = "Database lock protocol error" };
	[16] = { code = 16;   type = "continue"; condition = "EMPTY";      text = "Internal use only" };
	[17] = { code = 17;   type = "modify";   condition = "SCHEMA";     text = "The database schema changed" };
	[18] = { code = 18;   type = "modify";   condition = "TOOBIG";     text = "String or BLOB exceeds size limit" };
	[19] = { code = 19;   type = "modify";   condition = "CONSTRAINT"; text = "Abort due to constraint violation" };
	[20] = { code = 20;   type = "modify";   condition = "MISMATCH";   text = "Data type mismatch" };
	[21] = { code = 21;   type = "modify";   condition = "MISUSE";     text = "Library used incorrectly" };
	[22] = { code = 22;   type = "cancel";   condition = "NOLFS";      text = "Uses OS features not supported on host" };
	[23] = { code = 23;   type = "auth";     condition = "AUTH";       text = "Authorization denied" };
	[24] = { code = 24;   type = "modify";   condition = "FORMAT";     text = "Not used" };
	[25] = { code = 25;   type = "modify";   condition = "RANGE";      text = "2nd parameter to sqlite3_bind out of range" };
	[26] = { code = 26;   type = "cancel";   condition = "NOTADB";     text = "File opened that is not a database file" };
	[27] = { code = 27;   type = "continue"; condition = "NOTICE";     text = "Notifications from sqlite3_log()" };
	[28] = { code = 28;   type = "continue"; condition = "WARNING";    text = "Warnings from sqlite3_log()" };
	[100] = { code = 100; type = "continue"; condition = "ROW";        text = "sqlite3_step() has another row ready" };
	[101] = { code = 101; type = "continue"; condition = "DONE";       text = "sqlite3_step() has finished executing" };
});

local assert = function(cond, errno, err)
	return assert(sqlite_errors.coerce(cond, err or errno));
end
local _ENV = nil;
-- luacheck: std none

local column_mt = {};
local table_mt = {};
local query_mt = {};
--local op_mt = {};
local index_mt = {};

local function is_column(x) return getmetatable(x)==column_mt; end
local function is_index(x) return getmetatable(x)==index_mt; end
local function is_table(x) return getmetatable(x)==table_mt; end
local function is_query(x) return getmetatable(x)==query_mt; end
local function Integer(n) return "Integer()" end
local function String(n) return "String()" end

local function Column(definition)
	return setmetatable(definition, column_mt);
end
local function Table(definition)
	local c = {}
	for i,col in ipairs(definition) do
		if is_column(col) then
			c[i], c[col.name] = col, col;
		elseif is_index(col) then
			col.table = definition.name;
		end
	end
	return setmetatable({ __table__ = definition, c = c, name = definition.name }, table_mt);
end
local function Index(definition)
	return setmetatable(definition, index_mt);
end

function table_mt:__tostring()
	local s = { 'name="'..self.__table__.name..'"' }
	for i,col in ipairs(self.__table__) do
		s[#s+1] = tostring(col);
	end
	return 'Table{ '..t_concat(s, ", ")..' }'
end
table_mt.__index = {};
function table_mt.__index:create(engine)
	return engine:_create_table(self);
end
function table_mt:__call(...)
	-- TODO
end
function column_mt:__tostring()
	return 'Column{ name="'..self.name..'", type="'..self.type..'" }'
end
function index_mt:__tostring()
	local s = 'Index{ name="'..self.name..'"';
	for i=1,#self do s = s..', "'..self[i]:gsub("[\\\"]", "\\%1")..'"'; end
	return s..' }';
--	return 'Index{ name="'..self.name..'", type="'..self.type..'" }'
end

local function urldecode(s) return s and (s:gsub("%%(%x%x)", function (c) return s_char(tonumber(c,16)); end)); end
local function parse_url(url)
	local scheme, secondpart, database = url:match("^([%w%+]+)://([^/]*)/?(.*)");
	assert(scheme, "Invalid URL format");
	local username, password, host, port;
	local authpart, hostpart = secondpart:match("([^@]+)@([^@+])");
	if not authpart then hostpart = secondpart; end
	if authpart then
		username, password = authpart:match("([^:]*):(.*)");
		username = username or authpart;
		password = password and urldecode(password);
	end
	if hostpart then
		host, port = hostpart:match("([^:]*):(.*)");
		host = host or hostpart;
		port = port and assert(tonumber(port), "Invalid URL format");
	end
	return {
		scheme = scheme:lower();
		username = username; password = password;
		host = host; port = port;
		database = #database > 0 and database or nil;
	};
end

local engine = {};
function engine:connect()
	if self.conn then return true; end

	local params = self.params;
	assert(params.driver == "SQLite3", "Only sqlite3 is supported");
	local dbh, err = sqlite_errors.coerce(lsqlite3.open(params.database));
	if not dbh then return nil, err; end
	self.conn = dbh;
	self.prepared = {};
	local ok, err = self:set_encoding();
	if not ok then
		return ok, err;
	end
	local ok, err = self:onconnect();
	if ok == false then
		return ok, err;
	end
	return true;
end
function engine:onconnect()
	-- Override from create_engine()
end
function engine:ondisconnect() -- luacheck: ignore 212/self
	-- Override from create_engine()
end
function engine:execute(sql, ...)
	local success, err = self:connect();
	if not success then return success, err; end
	local prepared = self.prepared;

	if select('#', ...) == 0 then
		local ret = self.conn:exec(sql);
		if ret ~= lsqlite3.OK then
			local err = sqlite_errors.new(err);
			err.text = self.conn:errmsg();
			return err;
		end
		return true;
	end

	local stmt = prepared[sql];
	if not stmt then
		local err;
		stmt, err = self.conn:prepare(sql);
		if not stmt then
			err = sqlite_errors.new(err);
			err.text = self.conn:errmsg();
			return stmt, err;
		end
		prepared[sql] = stmt;
	end

	local ret = stmt:bind_values(...);
	if ret ~= lsqlite3.OK then return nil, sqlite_errors.new(ret, { message = self.conn:errmsg() }); end
	return stmt;
end

local result_mt = {
	__index = {
	affected = function(self) return self.__affected; end;
	rowcount = function(self) return self.__rowcount; end;
	},
};

local function iterator(table)
	local i=0;
	return function()
		i=i+1;
		local item=table[i];
		if item ~= nil then
			return item;
		end
	end
end

local function debugquery(where, sql, ...)
	local i = 0; local a = {...}
	sql = sql:gsub("\n?\t+", " ");
	log("debug", "[%s] %s", where, (sql:gsub("%?", function ()
		i = i + 1;
		local v = a[i];
		if type(v) == "string" then
			v = ("'%s'"):format(v:gsub("'", "''"));
		end
		return tostring(v);
	end)));
end

function engine:execute_query(sql, ...)
	local prepared = self.prepared;
	local stmt = prepared[sql];
	if stmt and stmt:isopen() then
		prepared[sql] = nil; -- Can't be used concurrently
	else
		stmt = assert(self.conn:prepare(sql));
	end
	local ret = stmt:bind_values(...);
	if ret ~= lsqlite3.OK then error(self.conn:errmsg()); end
	local data, ret = {}
	while stmt:step() == ROW do
		t_insert(data, stmt:get_values());
	end
	-- FIXME Error handling, BUSY, ERROR, MISUSE
	if stmt:reset() == lsqlite3.OK then
		prepared[sql] = stmt;
	end
	return setmetatable({ __data = data }, { __index = result_mt.__index, __call = iterator(data) });
end
function engine:execute_update(sql, ...)
	local prepared = self.prepared;
	local stmt = prepared[sql];
	if not stmt or not stmt:isopen() then
		stmt = assert(self.conn:prepare(sql));
	else
		prepared[sql] = nil;
	end
	local ret = stmt:bind_values(...);
	if ret ~= lsqlite3.OK then error(self.conn:errmsg()); end
	local rowcount = 0;
	repeat
		ret = stmt:step();
		if ret == lsqlite3.ROW then
			rowcount = rowcount + 1;
		end
	until ret ~= lsqlite3.ROW;
	local affected = self.conn:changes();
	if stmt:reset() == lsqlite3.OK then
		prepared[sql] = stmt;
	end
	return setmetatable({ __affected = affected, __rowcount = rowcount }, result_mt);
end
engine.insert = engine.execute_update;
engine.select = engine.execute_query;
engine.delete = engine.execute_update;
engine.update = engine.execute_update;
local function debugwrap(name, f)
	return function (self, sql, ...)
		debugquery(name, sql, ...)
		return f(self, sql, ...)
	end
end
function engine:debug(enable)
	self._debug = enable;
	if enable then
		engine.insert = debugwrap("insert", engine.execute_update);
		engine.select = debugwrap("select", engine.execute_query);
		engine.delete = debugwrap("delete", engine.execute_update);
		engine.update = debugwrap("update", engine.execute_update);
	else
		engine.insert = engine.execute_update;
		engine.select = engine.execute_query;
		engine.delete = engine.execute_update;
		engine.update = engine.execute_update;
	end
end
function engine:_(word)
	local ret = self.conn:exec(word);
	if ret ~= lsqlite3.OK then return nil, self.conn:errmsg(); end
	return true;
end
function engine:_transaction(func, ...)
	if not self.conn then
		local a,b = self:connect();
		if not a then return a,b; end
	end
	--assert(not self.__transaction, "Recursive transactions not allowed");
	local ok, err = self:_"BEGIN";
	if not ok then return ok, err; end
	self.__transaction = true;
	local success, a, b, c = xpcall(func, debug_traceback, ...);
	self.__transaction = nil;
	if success then
		log("debug", "SQL transaction success [%s]", tostring(func));
		local ok, err = self:_"COMMIT";
		if not ok then return ok, err; end -- commit failed
		return success, a, b, c;
	else
		log("debug", "SQL transaction failure [%s]: %s", tostring(func), a);
		if self.conn then self:_"ROLLBACK"; end
		return success, a;
	end
end
function engine:transaction(...)
	local ok, ret = self:_transaction(...);
	if not ok then
		local conn = self.conn;
		if not conn or not conn:isopen() then
			self.conn = nil;
			self:ondisconnect();
			ok, ret = self:_transaction(...);
		end
	end
	return ok, ret;
end
function engine:_create_index(index)
	local sql = "CREATE INDEX IF NOT EXISTS \""..index.name.."\" ON \""..index.table.."\" (";
	for i=1,#index do
		sql = sql.."\""..index[i].."\"";
		if i ~= #index then sql = sql..", "; end
	end
	sql = sql..");"
	if index.unique then
		sql = sql:gsub("^CREATE", "CREATE UNIQUE");
	end
	if self._debug then
		debugquery("create", sql);
	end
	return self:execute(sql);
end
function engine:_create_table(table)
	local sql = "CREATE TABLE IF NOT EXISTS \""..table.name.."\" (";
	for i,col in ipairs(table.c) do
		local col_type = col.type;
		sql = sql.."\""..col.name.."\" "..col_type;
		if col.nullable == false then sql = sql.." NOT NULL"; end
		if col.primary_key == true then sql = sql.." PRIMARY KEY"; end
		if col.auto_increment == true then
			sql = sql.." AUTOINCREMENT";
		end
		if i ~= #table.c then sql = sql..", "; end
	end
	sql = sql.. ");"
	if self._debug then
		debugquery("create", sql);
	end
	local success,err = self:execute(sql);
	if not success then return success,err; end
	for i,v in ipairs(table.__table__) do
		if is_index(v) then
			self:_create_index(v);
		end
	end
	return success;
end
function engine:set_encoding() -- to UTF-8
	return self:transaction(function()
			for encoding in self:select"PRAGMA encoding;" do
				if encoding[1] == "UTF-8" then
				self.charset = "utf8";
			end
		end
	end);
end
local engine_mt = { __index = engine };

local function db2uri(params)
	return build_url{
		scheme = params.driver,
		user = params.username,
		password = params.password,
		host = params.host,
		port = params.port,
		path = params.database,
	};
end

local function create_engine(_, params, onconnect, ondisconnect)
	assert(params.driver == "SQLite3", "Only SQLite3 is supported without LuaDBI");
	return setmetatable({ url = db2uri(params); params = params; onconnect = onconnect; ondisconnect = ondisconnect }, engine_mt);
end

return {
	is_column = is_column;
	is_index = is_index;
	is_table = is_table;
	is_query = is_query;
	Integer = Integer;
	String = String;
	Column = Column;
	Table = Table;
	Index = Index;
	create_engine = create_engine;
	db2uri = db2uri;
};