1 files changed, 180 insertions, 136 deletions

diff --git a/util/sql.lua b/util/sql.lua
index f360d6d0..15749911 100644
--- a/util/sql.lua
+++ b/util/sql.lua
@@ -1,8 +1,9 @@
 
 local setmetatable, getmetatable = setmetatable, getmetatable;
-local ipairs, unpack, select = ipairs, unpack, select;
+local ipairs, unpack, select = ipairs, table.unpack or unpack, select; --luacheck: ignore 113
 local tonumber, tostring = tonumber, tostring;
-local assert, xpcall, debug_traceback = assert, xpcall, debug.traceback;
+local type = type;
+local assert, pcall, xpcall, debug_traceback = assert, pcall, xpcall, debug.traceback;
 local t_concat = table.concat;
 local s_char = string.char;
 local log = require "util.logger".init("sql");
@@ -13,7 +14,7 @@ local DBI = require "DBI";
 DBI.Drivers();
 local build_url = require "socket.url".build;
 
-module("sql")
+local _ENV = nil;
 
 local column_mt = {};
 local table_mt = {};
@@ -21,42 +22,17 @@ local query_mt = {};
 --local op_mt = {};
 local index_mt = {};
 
-function is_column(x) return getmetatable(x)==column_mt; end
-function is_index(x) return getmetatable(x)==index_mt; end
-function is_table(x) return getmetatable(x)==table_mt; end
-function is_query(x) return getmetatable(x)==query_mt; end
---function is_op(x) return getmetatable(x)==op_mt; end
---function expr(...) return setmetatable({...}, op_mt); end
-function Integer(n) return "Integer()" end
-function String(n) return "String()" end
+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() return "Integer()" end
+local function String() return "String()" end
 
---[[local ops = {
-	__add = function(a, b) return "("..a.."+"..b..")" end;
-	__sub = function(a, b) return "("..a.."-"..b..")" end;
-	__mul = function(a, b) return "("..a.."*"..b..")" end;
-	__div = function(a, b) return "("..a.."/"..b..")" end;
-	__mod = function(a, b) return "("..a.."%"..b..")" end;
-	__pow = function(a, b) return "POW("..a..","..b..")" end;
-	__unm = function(a) return "NOT("..a..")" end;
-	__len = function(a) return "COUNT("..a..")" end;
-	__eq = function(a, b) return "("..a.."=="..b..")" end;
-	__lt = function(a, b) return "("..a.."<"..b..")" end;
-	__le = function(a, b) return "("..a.."<="..b..")" end;
-};
-
-local functions = {
-	
-};
-
-local cmap = {
-	[Integer] = Integer();
-	[String] = String();
-};]]
-
-function Column(definition)
+local function Column(definition)
 	return setmetatable(definition, column_mt);
 end
-function Table(definition)
+local function Table(definition)
 	local c = {}
 	for i,col in ipairs(definition) do
 		if is_column(col) then
@@ -67,13 +43,13 @@ function Table(definition)
 	end
 	return setmetatable({ __table__ = definition, c = c, name = definition.name }, table_mt);
 end
-function Index(definition)
+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
+	for _, col in ipairs(self.__table__) do
 		s[#s+1] = tostring(col);
 	end
 	return 'Table{ '..t_concat(s, ", ")..' }'
@@ -94,7 +70,6 @@ function index_mt:__tostring()
 	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)
@@ -121,48 +96,50 @@ local function parse_url(url)
 	};
 end
 
---[[local session = {};
-
-function session.query(...)
-	local rets = {...};
-	local query = setmetatable({ __rets = rets, __filters }, query_mt);
-	return query;
-end
---
-
-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 engine = {};
 function engine:connect()
 	if self.conn then return true; end
 
 	local params = self.params;
 	assert(params.driver, "no driver")
-	local dbh, err = DBI.Connect(
+	log("debug", "Connecting to [%s] %s...", params.driver, params.database);
+	local ok, dbh, err = pcall(DBI.Connect,
 		params.driver, params.database,
 		params.username, params.password,
 		params.host, params.port
 	);
+	if not ok then return ok, dbh; end
 	if not dbh then return nil, err; end
 	dbh:autocommit(false); -- don't commit automatically
 	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:prepquery(sql)
+	if self.params.driver == "MySQL" then
+		sql = sql:gsub("\"", "`");
+	end
+	return sql;
+end
+
 function engine:execute(sql, ...)
 	local success, err = self:connect();
 	if not success then return success, err; end
 	local prepared = self.prepared;
 
+	sql = self:prepquery(sql);
 	local stmt = prepared[sql];
 	if not stmt then
 		local err;
@@ -177,22 +154,31 @@ function engine:execute(sql, ...)
 end
 
 local result_mt = { __index = {
-	affected = function(self) return self.__affected; end;
-	rowcount = function(self) return self.__rowcount; end;
+	affected = function(self) return self.__stmt:affected(); end;
+	rowcount = function(self) return self.__stmt:rowcount(); 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, ...)
-	if self.params.driver == "PostgreSQL" then
-		sql = sql:gsub("`", "\"");
-	end
+	sql = self:prepquery(sql);
 	local stmt = assert(self.conn:prepare(sql));
 	assert(stmt:execute(...));
 	return stmt:rows();
 end
 function engine:execute_update(sql, ...)
-	if self.params.driver == "PostgreSQL" then
-		sql = sql:gsub("`", "\"");
-	end
+	sql = self:prepquery(sql);
 	local prepared = self.prepared;
 	local stmt = prepared[sql];
 	if not stmt then
@@ -200,22 +186,47 @@ function engine:execute_update(sql, ...)
 		prepared[sql] = stmt;
 	end
 	assert(stmt:execute(...));
-	return setmetatable({ __affected = stmt:affected(), __rowcount = stmt:rowcount() }, result_mt);
+	return setmetatable({ __stmt = stmt }, 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
+local function handleerr(err)
+	log("error", "Error in SQL transaction: %s", debug_traceback(err, 3));
+	return err;
+end
 function engine:_transaction(func, ...)
 	if not self.conn then
-		local a,b = self:connect();
-		if not a then return a,b; end
+		local ok, err = self:connect();
+		if not ok then return ok, err; end
 	end
 	--assert(not self.__transaction, "Recursive transactions not allowed");
 	local args, n_args = {...}, select("#", ...);
 	local function f() return func(unpack(args, 1, n_args)); end
+	log("debug", "SQL transaction begin [%s]", tostring(func));
 	self.__transaction = true;
-	local success, a, b, c = xpcall(f, debug_traceback);
+	local success, a, b, c = xpcall(f, handleerr);
 	self.__transaction = nil;
 	if success then
 		log("debug", "SQL transaction success [%s]", tostring(func));
@@ -229,51 +240,118 @@ function engine:_transaction(func, ...)
 	end
 end
 function engine:transaction(...)
-	local a,b = self:_transaction(...);
-	if not a then
+	local ok, ret = self:_transaction(...);
+	if not ok then
 		local conn = self.conn;
 		if not conn or not conn:ping() then
 			self.conn = nil;
-			a,b = self:_transaction(...);
+			ok, ret = self:_transaction(...);
 		end
 	end
-	return a,b;
+	return ok, ret;
 end
 function engine:_create_index(index)
-	local sql = "CREATE INDEX `"..index.name.."` ON `"..index.table.."` (";
+	local sql = "CREATE INDEX \""..index.name.."\" ON \""..index.table.."\" (";
 	for i=1,#index do
-		sql = sql.."`"..index[i].."`";
+		sql = sql.."\""..index[i].."\"";
 		if i ~= #index then sql = sql..", "; end
 	end
 	sql = sql..");"
-	if self.params.driver == "PostgreSQL" then
-		sql = sql:gsub("`", "\"");
-	elseif self.params.driver == "MySQL" then
-		sql = sql:gsub("`([,)])", "`(20)%1");
+	if self.params.driver == "MySQL" then
+		sql = sql:gsub("\"([,)])", "\"(20)%1");
+	end
+	if index.unique then
+		sql = sql:gsub("^CREATE", "CREATE UNIQUE");
+	end
+	if self._debug then
+		debugquery("create", sql);
 	end
-	--print(sql);
 	return self:execute(sql);
 end
 function engine:_create_table(table)
-	local sql = "CREATE TABLE `"..table.name.."` (";
+	local sql = "CREATE TABLE \""..table.name.."\" (";
 	for i,col in ipairs(table.c) do
-		sql = sql.."`"..col.name.."` "..col.type;
+		local col_type = col.type;
+		if col_type == "MEDIUMTEXT" and self.params.driver ~= "MySQL" then
+			col_type = "TEXT"; -- MEDIUMTEXT is MySQL-specific
+		end
+		if col.auto_increment == true and self.params.driver == "PostgreSQL" then
+			col_type = "BIGSERIAL";
+		end
+		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
+			if self.params.driver == "MySQL" then
+				sql = sql.." AUTO_INCREMENT";
+			elseif self.params.driver == "SQLite3" then
+				sql = sql.." AUTOINCREMENT";
+			end
+		end
 		if i ~= #table.c then sql = sql..", "; end
 	end
 	sql = sql.. ");"
-	if self.params.driver == "PostgreSQL" then
-		sql = sql:gsub("`", "\"");
+	if self.params.driver == "MySQL" then
+		sql = sql:gsub(";$", (" CHARACTER SET '%s' COLLATE '%s_bin';"):format(self.charset, self.charset));
+	end
+	if self._debug then
+		debugquery("create", sql);
 	end
 	local success,err = self:execute(sql);
 	if not success then return success,err; end
-	for i,v in ipairs(table.__table__) do
+	for _, v in ipairs(table.__table__) do
 		if is_index(v) then
 			self:_create_index(v);
 		end
 	end
 	return success;
 end
+function engine:set_encoding() -- to UTF-8
+	local driver = self.params.driver;
+	if driver == "SQLite3" then
+		return self:transaction(function()
+			for encoding in self:select"PRAGMA encoding;" do
+				if encoding[1] == "UTF-8" then
+					self.charset = "utf8";
+				end
+			end
+		end);
+	end
+	local set_names_query = "SET NAMES '%s';"
+	local charset = "utf8";
+	if driver == "MySQL" then
+		self:transaction(function()
+			for row in self:select"SELECT \"CHARACTER_SET_NAME\" FROM \"information_schema\".\"CHARACTER_SETS\" WHERE \"CHARACTER_SET_NAME\" LIKE 'utf8%' ORDER BY MAXLEN DESC LIMIT 1;" do
+				charset = row and row[1] or charset;
+			end
+		end);
+		set_names_query = set_names_query:gsub(";$", (" COLLATE '%s';"):format(charset.."_bin"));
+	end
+	self.charset = charset;
+	log("debug", "Using encoding '%s' for database connection", charset);
+	local ok, err = self:transaction(function() return self:execute(set_names_query:format(charset)); end);
+	if not ok then
+		return ok, err;
+	end
+
+	if driver == "MySQL" then
+		local ok, actual_charset = self:transaction(function ()
+			return self:select"SHOW SESSION VARIABLES LIKE 'character_set_client'";
+		end);
+		local charset_ok = true;
+		for row in actual_charset do
+			if row[2] ~= charset then
+				log("error", "MySQL %s is actually %q (expected %q)", row[1], row[2], charset);
+				charset_ok = false;
+			end
+		end
+		if not charset_ok then
+			return false, "Failed to set connection encoding";
+		end
+	end
+
+	return true;
+end
 local engine_mt = { __index = engine };
 
 local function db2uri(params)
@@ -286,55 +364,21 @@ local function db2uri(params)
 		path = params.database,
 	};
 end
-local engine_cache = {}; -- TODO make weak valued
-function create_engine(self, params)
-	local url = db2uri(params);
-	if not engine_cache[url] then
-		local engine = setmetatable({ url = url, params = params }, engine_mt);
-		engine_cache[url] = engine;
-	end
-	return engine_cache[url];
-end
-
 
---[[Users = Table {
-	name="users";
-	Column { name="user_id", type=String(), primary_key=true };
-};
-print(Users)
-print(Users.c.user_id)]]
-
---local engine = create_engine('postgresql://scott:tiger@localhost:5432/mydatabase');
---[[local engine = create_engine{ driver = "SQLite3", database = "./alchemy.sqlite" };
-
-local i = 0;
-for row in assert(engine:execute("select * from sqlite_master")):rows(true) do
-	i = i+1;
-	print(i);
-	for k,v in pairs(row) do
-		print("",k,v);
-	end
+local function create_engine(self, params, onconnect)
+	return setmetatable({ url = db2uri(params), params = params, onconnect = onconnect }, engine_mt);
 end
-print("---")
 
-Prosody = Table {
-	name="prosody";
-	Column { name="host", type="TEXT", nullable=false };
-	Column { name="user", type="TEXT", nullable=false };
-	Column { name="store", type="TEXT", nullable=false };
-	Column { name="key", type="TEXT", nullable=false };
-	Column { name="type", type="TEXT", nullable=false };
-	Column { name="value", type="TEXT", nullable=false };
-	Index { name="prosody_index", "host", "user", "store", "key" };
+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;
 };
---print(Prosody);
-assert(engine:transaction(function()
-	assert(Prosody:create(engine));
-end));
-
-for row in assert(engine:execute("select user from prosody")):rows(true) do
-	print("username:", row['username'])
-end
---result.close();]]
-
-return _M;