mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress

1 files changed, 237 insertions, 0 deletions

diff --git a/plugins/mod_storage_sql2.lua b/plugins/mod_storage_sql2.lua
new file mode 100644
index 00000000..7d705b0b
--- /dev/null
+++ b/plugins/mod_storage_sql2.lua
@@ -0,0 +1,237 @@
+
+local json = require "util.json";
+local resolve_relative_path = require "core.configmanager".resolve_relative_path;
+
+local mod_sql = module:require("sql");
+local params = module:get_option("sql");
+
+local engine; -- TODO create engine
+
+local function create_table()
+	--[[local Table,Column,Index = mod_sql.Table,mod_sql.Column,mod_sql.Index;
+	local ProsodyTable = 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" };
+	};
+	engine:transaction(function()
+		ProsodyTable:create(engine);
+	end);]]
+	if not module:get_option("sql_manage_tables", true) then
+		return;
+	end
+
+	local create_sql = "CREATE TABLE `prosody` (`host` TEXT, `user` TEXT, `store` TEXT, `key` TEXT, `type` TEXT, `value` TEXT);";
+	if params.driver == "PostgreSQL" then
+		create_sql = create_sql:gsub("`", "\"");
+	elseif params.driver == "MySQL" then
+		create_sql = create_sql:gsub("`value` TEXT", "`value` MEDIUMTEXT")
+			:gsub(";$", " CHARACTER SET 'utf8' COLLATE 'utf8_bin';");
+	end
+
+	local index_sql = "CREATE INDEX `prosody_index` ON `prosody` (`host`, `user`, `store`, `key`)";
+	if params.driver == "PostgreSQL" then
+		index_sql = index_sql:gsub("`", "\"");
+	elseif params.driver == "MySQL" then
+		index_sql = index_sql:gsub("`([,)])", "`(20)%1");
+	end
+
+	local success,err = engine:transaction(function()
+		engine:execute(create_sql);
+		engine:execute(index_sql);
+	end);
+	if not success then -- so we failed to create
+		if params.driver == "MySQL" then
+			success,err = engine:transaction(function()
+				local result = engine:execute("SHOW COLUMNS FROM prosody WHERE Field='value' and Type='text'");
+				if result:rowcount() > 0 then
+					module:log("info", "Upgrading database schema...");
+					engine:execute("ALTER TABLE prosody MODIFY COLUMN `value` MEDIUMTEXT");
+					module:log("info", "Database table automatically upgraded");
+				end
+				return true;
+			end);
+			if not success then
+				module:log("error", "Failed to check/upgrade database schema (%s), please see "
+					.."http://prosody.im/doc/mysql for help",
+					err or "unknown error");
+			end
+		end
+	end
+end
+local function set_encoding()
+	if params.driver ~= "SQLite3" then
+		local set_names_query = "SET NAMES 'utf8';";
+		if params.driver == "MySQL" then
+			set_names_query = set_names_query:gsub(";$", " COLLATE 'utf8_bin';");
+		end
+		local success,err = engine:transaction(function() return engine:execute(set_names_query); end);
+		if not success then
+			module:log("error", "Failed to set database connection encoding to UTF8: %s", err);
+			return;
+		end
+		if params.driver == "MySQL" then
+			-- COMPAT w/pre-0.9: Upgrade tables to UTF-8 if not already
+			local check_encoding_query = "SELECT `COLUMN_NAME`,`COLUMN_TYPE` FROM `information_schema`.`columns` WHERE `TABLE_NAME`='prosody' AND ( `CHARACTER_SET_NAME`!='utf8' OR `COLLATION_NAME`!='utf8_bin' );";
+			local success,err = engine:transaction(function()
+				local result = engine:execute(check_encoding_query);
+				local n_bad_columns = result:rowcount();
+				if n_bad_columns > 0 then
+					module:log("warn", "Found %d columns in prosody table requiring encoding change, updating now...", n_bad_columns);
+					local fix_column_query1 = "ALTER TABLE `prosody` CHANGE `%s` `%s` BLOB;";
+					local fix_column_query2 = "ALTER TABLE `prosody` CHANGE `%s` `%s` %s CHARACTER SET 'utf8' COLLATE 'utf8_bin';";
+					for row in success:rows() do
+						local column_name, column_type = unpack(row);
+						engine:execute(fix_column_query1:format(column_name, column_name));
+						engine:execute(fix_column_query2:format(column_name, column_name, column_type));
+					end
+					module:log("info", "Database encoding upgrade complete!");
+				end
+			end);
+			local success,err = engine:transaction(function() return engine:execute(check_encoding_query); end);
+			if not success then
+				module:log("error", "Failed to check/upgrade database encoding: %s", err or "unknown error");
+			end
+		end
+	end
+end
+
+do -- process options to get a db connection
+	params = params or { driver = "SQLite3" };
+	
+	if params.driver == "SQLite3" then
+		params.database = resolve_relative_path(prosody.paths.data or ".", params.database or "prosody.sqlite");
+	end
+	
+	assert(params.driver and params.database, "Both the SQL driver and the database need to be specified");
+
+	--local dburi = db2uri(params);
+	engine = mod_sql:create_engine(params);
+	
+	-- Encoding mess
+	set_encoding();
+
+	-- Automatically create table, ignore failure (table probably already exists)
+	create_table();
+end
+
+local function serialize(value)
+	local t = type(value);
+	if t == "string" or t == "boolean" or t == "number" then
+		return t, tostring(value);
+	elseif t == "table" then
+		local value,err = json.encode(value);
+		if value then return "json", value; end
+		return nil, err;
+	end
+	return nil, "Unhandled value type: "..t;
+end
+local function deserialize(t, value)
+	if t == "string" then return value;
+	elseif t == "boolean" then
+		if value == "true" then return true;
+		elseif value == "false" then return false; end
+	elseif t == "number" then return tonumber(value);
+	elseif t == "json" then
+		return json.decode(value);
+	end
+end
+
+local host = module.host;
+local user, store;
+
+local function keyval_store_get()
+	local haveany;
+	local result = {};
+	for row in engine:select("SELECT `key`,`type`,`value` FROM `prosody` WHERE `host`=? AND `user`=? AND `store`=?", host, user, store) do
+		haveany = true;
+		local k = row[1];
+		local v = deserialize(row[2], row[3]);
+		if k and v then
+			if k ~= "" then result[k] = v; elseif type(v) == "table" then
+				for a,b in pairs(v) do
+					result[a] = b;
+				end
+			end
+		end
+	end
+	if haveany then
+		return result;
+	end
+end
+local function keyval_store_set(data)
+	engine:delete("DELETE FROM `prosody` WHERE `host`=? AND `user`=? AND `store`=?", host, user, store);
+	
+	if data and next(data) ~= nil then
+		local extradata = {};
+		for key, value in pairs(data) do
+			if type(key) == "string" and key ~= "" then
+				local t, value = serialize(value);
+				assert(t, value);
+				engine:insert("INSERT INTO `prosody` (`host`,`user`,`store`,`key`,`type`,`value`) VALUES (?,?,?,?,?,?)", host, user, store, key, t, value);
+			else
+				extradata[key] = value;
+			end
+		end
+		if next(extradata) ~= nil then
+			local t, extradata = serialize(extradata);
+			assert(t, extradata);
+			engine:insert("INSERT INTO `prosody` (`host`,`user`,`store`,`key`,`type`,`value`) VALUES (?,?,?,?,?,?)", host, user, store, "", t, extradata);
+		end
+	end
+	return true;
+end
+
+local keyval_store = {};
+keyval_store.__index = keyval_store;
+function keyval_store:get(username)
+	user,store = username,self.store;
+	return select(2, engine:transaction(keyval_store_get));
+end
+function keyval_store:set(username, data)
+	user,store = username,self.store;
+	return engine:transaction(function()
+		return keyval_store_set(data);
+	end);
+end
+function keyval_store:users()
+	return engine:transaction(function()
+		return engine:select("SELECT DISTINCT `user` FROM `prosody` WHERE `host`=? AND `store`=?", host, self.store);
+	end);
+end
+
+local driver = {};
+
+function driver:open(store, typ)
+	if not typ then -- default key-value store
+		return setmetatable({ store = store }, keyval_store);
+	end
+	return nil, "unsupported-store";
+end
+
+function driver:stores(username)
+	local sql = "SELECT DISTINCT `store` FROM `prosody` WHERE `host`=? AND `user`" ..
+		(username == true and "!=?" or "=?");
+	if username == true or not username then
+		username = "";
+	end
+	return engine:transaction(function()
+		return engine:select(sql, host, username);
+	end);
+end
+
+function driver:purge(username)
+	return engine:transaction(function()
+		local stmt,err = engine:delete("DELETE FROM `prosody` WHERE `host`=? AND `user`=?", host, username);
+		return true,err;
+	end);
+end
+
+module:provides("storage", driver);
+
+