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