|
| 1 | +----------------------------------------------------------------------------- |
| 2 | +-- LuaSocket helper module |
| 3 | +-- Author: Diego Nehab |
| 4 | +----------------------------------------------------------------------------- |
| 5 | + |
| 6 | +----------------------------------------------------------------------------- |
| 7 | +-- Declare module and import dependencies |
| 8 | +----------------------------------------------------------------------------- |
| 9 | +local base = _G |
| 10 | +local string = require("string") |
| 11 | +local math = require("math") |
| 12 | +local socket = require("socket.core") |
| 13 | + |
| 14 | +local _M = socket |
| 15 | + |
| 16 | +----------------------------------------------------------------------------- |
| 17 | +-- Exported auxiliar functions |
| 18 | +----------------------------------------------------------------------------- |
| 19 | +function _M.connect4(address, port, laddress, lport) |
| 20 | + return socket.connect(address, port, laddress, lport, "inet") |
| 21 | +end |
| 22 | + |
| 23 | +function _M.connect6(address, port, laddress, lport) |
| 24 | + return socket.connect(address, port, laddress, lport, "inet6") |
| 25 | +end |
| 26 | + |
| 27 | +function _M.bind(host, port, backlog) |
| 28 | + if host == "*" then host = "0.0.0.0" end |
| 29 | + local addrinfo, err = socket.dns.getaddrinfo(host); |
| 30 | + if not addrinfo then return nil, err end |
| 31 | + local sock, res |
| 32 | + err = "no info on address" |
| 33 | + for i, alt in base.ipairs(addrinfo) do |
| 34 | + if alt.family == "inet" then |
| 35 | + sock, err = socket.tcp4() |
| 36 | + else |
| 37 | + sock, err = socket.tcp6() |
| 38 | + end |
| 39 | + if not sock then return nil, err end |
| 40 | + sock:setoption("reuseaddr", true) |
| 41 | + res, err = sock:bind(alt.addr, port) |
| 42 | + if not res then |
| 43 | + sock:close() |
| 44 | + else |
| 45 | + res, err = sock:listen(backlog) |
| 46 | + if not res then |
| 47 | + sock:close() |
| 48 | + else |
| 49 | + return sock |
| 50 | + end |
| 51 | + end |
| 52 | + end |
| 53 | + return nil, err |
| 54 | +end |
| 55 | + |
| 56 | +_M.try = _M.newtry() |
| 57 | + |
| 58 | +function _M.choose(table) |
| 59 | + return function(name, opt1, opt2) |
| 60 | + if base.type(name) ~= "string" then |
| 61 | + name, opt1, opt2 = "default", name, opt1 |
| 62 | + end |
| 63 | + local f = table[name or "nil"] |
| 64 | + if not f then base.error("unknown key (".. base.tostring(name) ..")", 3) |
| 65 | + else return f(opt1, opt2) end |
| 66 | + end |
| 67 | +end |
| 68 | + |
| 69 | +----------------------------------------------------------------------------- |
| 70 | +-- Socket sources and sinks, conforming to LTN12 |
| 71 | +----------------------------------------------------------------------------- |
| 72 | +-- create namespaces inside LuaSocket namespace |
| 73 | +local sourcet, sinkt = {}, {} |
| 74 | +_M.sourcet = sourcet |
| 75 | +_M.sinkt = sinkt |
| 76 | + |
| 77 | +_M.BLOCKSIZE = 2048 |
| 78 | + |
| 79 | +sinkt["close-when-done"] = function(sock) |
| 80 | + return base.setmetatable({ |
| 81 | + getfd = function() return sock:getfd() end, |
| 82 | + dirty = function() return sock:dirty() end |
| 83 | + }, { |
| 84 | + __call = function(self, chunk, err) |
| 85 | + if not chunk then |
| 86 | + sock:close() |
| 87 | + return 1 |
| 88 | + else return sock:send(chunk) end |
| 89 | + end |
| 90 | + }) |
| 91 | +end |
| 92 | + |
| 93 | +sinkt["keep-open"] = function(sock) |
| 94 | + return base.setmetatable({ |
| 95 | + getfd = function() return sock:getfd() end, |
| 96 | + dirty = function() return sock:dirty() end |
| 97 | + }, { |
| 98 | + __call = function(self, chunk, err) |
| 99 | + if chunk then return sock:send(chunk) |
| 100 | + else return 1 end |
| 101 | + end |
| 102 | + }) |
| 103 | +end |
| 104 | + |
| 105 | +sinkt["default"] = sinkt["keep-open"] |
| 106 | + |
| 107 | +_M.sink = _M.choose(sinkt) |
| 108 | + |
| 109 | +sourcet["by-length"] = function(sock, length) |
| 110 | + return base.setmetatable({ |
| 111 | + getfd = function() return sock:getfd() end, |
| 112 | + dirty = function() return sock:dirty() end |
| 113 | + }, { |
| 114 | + __call = function() |
| 115 | + if length <= 0 then return nil end |
| 116 | + local size = math.min(socket.BLOCKSIZE, length) |
| 117 | + local chunk, err = sock:receive(size) |
| 118 | + if err then return nil, err end |
| 119 | + length = length - string.len(chunk) |
| 120 | + return chunk |
| 121 | + end |
| 122 | + }) |
| 123 | +end |
| 124 | + |
| 125 | +sourcet["until-closed"] = function(sock) |
| 126 | + local done |
| 127 | + return base.setmetatable({ |
| 128 | + getfd = function() return sock:getfd() end, |
| 129 | + dirty = function() return sock:dirty() end |
| 130 | + }, { |
| 131 | + __call = function() |
| 132 | + if done then return nil end |
| 133 | + local chunk, err, partial = sock:receive(socket.BLOCKSIZE) |
| 134 | + if not err then return chunk |
| 135 | + elseif err == "closed" then |
| 136 | + sock:close() |
| 137 | + done = 1 |
| 138 | + return partial |
| 139 | + else return nil, err end |
| 140 | + end |
| 141 | + }) |
| 142 | +end |
| 143 | + |
| 144 | + |
| 145 | +sourcet["default"] = sourcet["until-closed"] |
| 146 | + |
| 147 | +_M.source = _M.choose(sourcet) |
| 148 | + |
| 149 | +return _M |
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