mod_storage_sql: Initial commit of new SQL data driver.

plugins/mod_storage_sql.lua

@@ -0,0 +1,226 @@
+
+--[[
+
+DB Tables:
+	Prosody - key-value, map
+		| host | user | store | key | subkey | type | value |
+	ProsodyArchive - list
+		| host | user | store | key | time | stanzatype | jsonvalue |
+
+Mapping:
+	Roster - Prosody
+		| host | user | "roster" | "contactjid" | item-subkey | type | value |
+		| host | user | "roster" | NULL | NULL | "json" | roster[false] data |
+	Account - Prosody
+		| host | user | "accounts" | "username" | NULL | type | value |
+
+	Offline - ProsodyArchive
+		| host | user | "offline" | "contactjid" | time | "message" | json|XML |
+
+]]
+
+local type = type;
+local tostring = tostring;
+local tonumber = tonumber;
+local pairs = pairs;
+local next = next;
+local setmetatable = setmetatable;
+local json = { stringify = function(s) return require"util.serialzation".serialize(s) end, parse = require"util.serialization".deserialze };
+
+local connection = ...;
+local host,user,store = module.host;
+
+do -- process options to get a db connection
+	local DBI = require "DBI";
+
+	local params = module:get_option("sql");
+	assert(params and params.driver and params.database, "invalid params");
+	
+	prosody.unlock_globals();
+	local dbh, err = DBI.Connect(
+		params.driver, params.database,
+		params.username, params.password,
+		params.host, params.port
+	);
+	prosody.lock_globals();
+	assert(dbh, err);
+
+	dbh:autocommit(false); -- don't commit automatically
+	connection = dbh;
+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.stringify(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 t;
+	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 value == "json" then
+		return json.parse(value);
+	end
+end
+
+local function getsql(sql, ...)
+	-- do prepared statement stuff
+	local stmt, err = connection:prepare(sql);
+	if not stmt then return nil, err; end
+	-- run query
+	local ok, err = stmt:execute(host, user, store, ...);
+	if not ok then return nil, err; end
+	
+	return stmt;
+end
+local function setsql(sql, ...)
+	local stmt, err = getsql(sql, ...);
+	if not stmt then return stmt, err; end
+	return stmt:affected();
+end
+local function transact(...)
+	-- ...
+end
+local function rollback(...)
+	connection:rollback(); -- FIXME check for rollback error?
+	return ...;
+end
+local function commit(...)
+	if not connection:commit() then return nil, "SQL commit failed"; end
+	return ...;
+end
+
+local keyval_store = {};
+keyval_store.__index = keyval_store;
+function keyval_store:get(username)
+	user,store = username,self.store;
+	local stmt, err = getsql("SELECT * FROM Prosody WHERE host=? AND user=? AND store=? AND subkey=NULL");
+	if not stmt then return nil, err; end
+	
+	local haveany;
+	local result = {};
+	for row in stmt:rows(true) do
+		haveany = true;
+		local k = row.key;
+		local v = deserialize(row.type, row.value);
+		if 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
+	return haveany and result or nil;
+end
+function keyval_store:set(username, data)
+	user,store = username,self.store;
+	-- start transaction
+	local affected, err = setsql("DELETE FROM Prosody WHERE host=? AND user=? AND store=? AND subkey=NULL");
+	
+	if data and next(data) ~= nil then
+		local extradata = {};
+		for key, value in pairs(data) do
+			if type(key) == "string" then
+				local t, value = serialize(value);
+				if not t then return rollback(t, value); end
+				local ok, err = setsql("INSERT INTO Prosody (host,user,store,key,type,value) VALUES (?,?,?,?,?,?)", key, t, value);
+				if not ok then return rollback(ok, err); end
+			else
+				extradata[key] = value;
+			end
+		end
+		if next(extradata) ~= nil then
+			local t, extradata = serialize(extradata);
+			if not t then return rollback(t, extradata); end
+			local ok, err = setsql("INSERT INTO Prosody (host,user,store,key,type,value) VALUES (?,?,?,?,?,?)", nil, t, extradata);
+			if not ok then return rollback(ok, err); end
+		end
+	end
+	return commit(true);
+end
+
+local map_store = {};
+map_store.__index = map_store;
+function map_store:get(username, key)
+	user,store = username,self.store;
+	local stmt, err = getsql("SELECT * FROM Prosody WHERE host=? AND user=? AND store=? AND key=?", key);
+	if not stmt then return nil, err; end
+	
+	local haveany;
+	local result = {};
+	for row in stmt:rows(true) do
+		haveany = true;
+		local k = row.subkey;
+		local v = deserialize(row.type, row.value);
+		if 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
+	return haveany and result or nil;
+end
+function map_store:set(username, key, data)
+	user,store = username,self.store;
+	-- start transaction
+	local affected, err = setsql("DELETE FROM Prosody WHERE host=? AND user=? AND store=? AND key=?", key);
+	
+	if data and next(data) ~= nil then
+		local extradata = {};
+		for subkey, value in pairs(data) do
+			if type(subkey) == "string" then
+				local t, value = serialize(value);
+				if not t then return rollback(t, value); end
+				local ok, err = setsql("INSERT INTO Prosody (host,user,store,key,subkey,type,value) VALUES (?,?,?,?,?,?)", key, subkey, t, value);
+				if not ok then return rollback(ok, err); end
+			else
+				extradata[subkey] = value;
+			end
+		end
+		if next(extradata) ~= nil then
+			local t, extradata = serialize(extradata);
+			if not t then return rollback(t, extradata); end
+			local ok, err = setsql("INSERT INTO Prosody (host,user,store,key,subkey,type,value) VALUES (?,?,?,?,?,?)", key, nil, t, extradata);
+			if not ok then return rollback(ok, err); end
+		end
+	end
+	return commit(true);
+end
+
+local list_store = {};
+list_store.__index = list_store;
+function list_store:scan(username, from, to, jid, typ)
+	user,store = username,self.store;
+	
+	local cols = {"from", "to", "jid", "typ"};
+	local vals = { from ,  to ,  jid ,  typ };
+	local stmt, err;
+	local query = "SELECT * FROM ProsodyArchive WHERE host=? AND user=? AND store=?";
+	
+	query = query.." ORDER BY time";
+	--local stmt, err = getsql("SELECT * FROM Prosody WHERE host=? AND user=? AND store=? AND key=?", key);
+	
+	return nil, "not-implemented"
+end
+
+local driver = { name = "sql" };
+
+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
+
+module:add_item("data-driver", driver);