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|
-----------------------------------------------------------------------------
-- LuaSocket helper module
-- Author: Diego Nehab
-- RCS ID: $Id$
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
-- Declare module and import dependencies
-----------------------------------------------------------------------------
module("socket")
local socket = require("lsocket")
-----------------------------------------------------------------------------
-- Auxiliar functions
-----------------------------------------------------------------------------
function socket.connect(address, port, laddress, lport)
local sock, err = socket.tcp()
if not sock then return nil, err end
if laddress then
local res, err = sock:bind(laddress, lport, -1)
if not res then return nil, err end
end
local res, err = sock:connect(address, port)
if not res then return nil, err end
return sock
end
function socket.bind(host, port, backlog)
local sock, err = socket.tcp()
if not sock then return nil, err end
sock:setoption("reuseaddr", true)
local res, err = sock:bind(host, port)
if not res then return nil, err end
res, err = sock:listen(backlog)
if not res then return nil, err end
return sock
end
socket.try = socket.newtry()
function socket.choose(table)
return function(name, opt1, opt2)
if type(name) ~= "string" then
name, opt1, opt2 = "default", name, opt1
end
local f = table[name or "nil"]
if not f then error("unknown key (" .. tostring(name) .. ")", 3)
else return f(opt1, opt2) end
end
end
-----------------------------------------------------------------------------
-- Socket sources and sinks, conforming to LTN12
-----------------------------------------------------------------------------
-- create namespaces inside LuaSocket namespace
socket.sourcet = {}
socket.sinkt = {}
socket.BLOCKSIZE = 2048
socket.sinkt["http-chunked"] = function(sock)
return setmetatable({
getfd = function() return sock:getfd() end,
dirty = function() return sock:dirty() end
}, {
__call = function(self, chunk, err)
if not chunk then return sock:send("0\r\n\r\n") end
local size = string.format("%X\r\n", string.len(chunk))
return sock:send(size, chunk, "\r\n")
end
})
end
socket.sinkt["close-when-done"] = function(sock)
return 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
socket.sinkt["keep-open"] = function(sock)
return 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
socket.sinkt["default"] = socket.sinkt["keep-open"]
socket.sink = socket.choose(socket.sinkt)
socket.sourcet["by-length"] = function(sock, length)
return 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
socket.sourcet["until-closed"] = function(sock)
local done
return 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
socket.sourcet["http-chunked"] = function(sock)
return setmetatable({
getfd = function() return sock:getfd() end,
dirty = function() return sock:dirty() end
}, {
__call = function()
-- get chunk size, skip extention
local line, err = sock:receive()
if err then return nil, err end
local size = tonumber(string.gsub(line, ";.*", ""), 16)
if not size then return nil, "invalid chunk size" end
-- was it the last chunk?
if size <= 0 then
-- skip trailer headers, if any
local line, err = sock:receive()
while not err and line ~= "" do
line, err = sock:receive()
end
return nil, err
else
-- get chunk and skip terminating CRLF
local chunk, err = sock:receive(size)
if chunk then sock:receive() end
return chunk, err
end
end
})
end
socket.sourcet["default"] = socket.sourcet["until-closed"]
socket.source = socket.choose(socket.sourcet)
|
