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lua
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socket.lua
----------------------------------------------------------------------------- -- LuaSocket helper module -- Author: Diego Nehab ----------------------------------------------------------------------------- ----------------------------------------------------------------------------- -- Declare module and import dependencies ----------------------------------------------------------------------------- local base = _G local string = require("string") local math = require("math") local socket = require("socket.core") local _M = socket ----------------------------------------------------------------------------- -- Exported auxiliar functions ----------------------------------------------------------------------------- function _M.connect4(address, port, laddress, lport) return socket.connect(address, port, laddress, lport, "inet") end function _M.connect6(address, port, laddress, lport) return socket.connect(address, port, laddress, lport, "inet6") end function _M.bind(host, port, backlog) if host == "*" then host = "0.0.0.0" end local addrinfo, err = socket.dns.getaddrinfo(host); if not addrinfo then return nil, err end local sock, res err = "no info on address" for i, alt in base.ipairs(addrinfo) do if alt.family == "inet" then sock, err = socket.tcp() else sock, err = socket.tcp6() end if not sock then return nil, err end sock:setoption("reuseaddr", true) res, err = sock:bind(alt.addr, port) if not res then sock:close() else res, err = sock:listen(backlog) if not res then sock:close() else return sock end end end return nil, err end _M.try = _M.newtry() function _M.choose(table) return function(name, opt1, opt2) if base.type(name) ~= "string" then name, opt1, opt2 = "default", name, opt1 end local f = table[name or "nil"] if not f then base.error("unknown key (".. base.tostring(name) ..")", 3) else return f(opt1, opt2) end end end ----------------------------------------------------------------------------- -- Socket sources and sinks, conforming to LTN12 ----------------------------------------------------------------------------- -- create namespaces inside LuaSocket namespace local sourcet, sinkt = {}, {} _M.sourcet = sourcet _M.sinkt = sinkt _M.BLOCKSIZE = 2048 sinkt["close-when-done"] = function(sock) return base.setmetatable({ getfd = function() return sock:getfd() end, dirty = function() return sock:dirty() end }, { __call = function(self, chunk, err) if not chunk then sock:close() return 1 else return sock:send(chunk) end end }) end sinkt["keep-open"] = function(sock) return base.setmetatable({ getfd = function() return sock:getfd() end, dirty = function() return sock:dirty() end }, { __call = function(self, chunk, err) if chunk then return sock:send(chunk) else return 1 end end }) end sinkt["default"] = sinkt["keep-open"] _M.sink = _M.choose(sinkt) sourcet["by-length"] = function(sock, length) return base.setmetatable({ getfd = function() return sock:getfd() end, dirty = function() return sock:dirty() end }, { __call = function() if length <= 0 then return nil end local size = math.min(socket.BLOCKSIZE, length) local chunk, err = sock:receive(size) if err then return nil, err end length = length - string.len(chunk) return chunk end }) end sourcet["until-closed"] = function(sock) local done return base.setmetatable({ getfd = function() return sock:getfd() end, dirty = function() return sock:dirty() end }, { __call = function() if done then return nil end local chunk, err, partial = sock:receive(socket.BLOCKSIZE) if not err then return chunk elseif err == "closed" then sock:close() done = 1 return partial else return nil, err end end }) end sourcet["default"] = sourcet["until-closed"] _M.source = _M.choose(sourcet) return _M
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