/usr/lib/prosody/util/sql.lua is in prosody 0.9.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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local ipairs, unpack, select = ipairs, unpack, select;
local tonumber, tostring = tonumber, tostring;
local assert, xpcall, debug_traceback = assert, xpcall, debug.traceback;
local t_concat = table.concat;
local s_char = string.char;
local log = require "util.logger".init("sql");
local DBI = require "DBI";
-- This loads all available drivers while globals are unlocked
-- LuaDBI should be fixed to not set globals.
DBI.Drivers();
local build_url = require "socket.url".build;
module("sql")
local column_mt = {};
local table_mt = {};
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 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)
return setmetatable(definition, column_mt);
end
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
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 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(
params.driver, params.database,
params.username, params.password,
params.host, params.port
);
if not dbh then return nil, err; end
dbh:autocommit(false); -- don't commit automatically
self.conn = dbh;
self.prepared = {};
return true;
end
function engine:execute(sql, ...)
local success, err = self:connect();
if not success then return success, err; end
local prepared = self.prepared;
local stmt = prepared[sql];
if not stmt then
local err;
stmt, err = self.conn:prepare(sql);
if not stmt then return stmt, err; end
prepared[sql] = stmt;
end
local success, err = stmt:execute(...);
if not success then return success, err; end
return stmt;
end
local result_mt = { __index = {
affected = function(self) return self.__affected; end;
rowcount = function(self) return self.__rowcount; end;
} };
function engine:execute_query(sql, ...)
if self.params.driver == "PostgreSQL" then
sql = sql:gsub("`", "\"");
end
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
local prepared = self.prepared;
local stmt = prepared[sql];
if not stmt then
stmt = assert(self.conn:prepare(sql));
prepared[sql] = stmt;
end
assert(stmt:execute(...));
return setmetatable({ __affected = stmt:affected(), __rowcount = stmt:rowcount() }, result_mt);
end
engine.insert = engine.execute_update;
engine.select = engine.execute_query;
engine.delete = engine.execute_update;
engine.update = engine.execute_update;
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 args, n_args = {...}, select("#", ...);
local function f() return func(unpack(args, 1, n_args)); end
self.__transaction = true;
local success, a, b, c = xpcall(f, debug_traceback);
self.__transaction = nil;
if success then
log("debug", "SQL transaction success [%s]", tostring(func));
local ok, err = self.conn: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.conn:rollback(); end
return success, a;
end
end
function engine:transaction(...)
local a,b = self:_transaction(...);
if not a then
local conn = self.conn;
if not conn or not conn:ping() then
self.conn = nil;
a,b = self:_transaction(...);
end
end
return a,b;
end
function engine:_create_index(index)
local sql = "CREATE INDEX `"..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 self.params.driver == "PostgreSQL" then
sql = sql:gsub("`", "\"");
elseif self.params.driver == "MySQL" then
sql = sql:gsub("`([,)])", "`(20)%1");
end
--print(sql);
return self:execute(sql);
end
function engine:_create_table(table)
local sql = "CREATE TABLE `"..table.name.."` (";
for i,col in ipairs(table.c) do
sql = sql.."`"..col.name.."` "..col.type;
if col.nullable == false then sql = sql.." NOT NULL"; end
if i ~= #table.c then sql = sql..", "; end
end
sql = sql.. ");"
if self.params.driver == "PostgreSQL" then
sql = sql:gsub("`", "\"");
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
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 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
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" };
};
--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;
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