2 nixio - Linux I/O library for lua
4 Copyright 2009 Steven Barth <steven@midlink.org>
6 Licensed under the Apache License, Version 2.0 (the "License");
7 you may not use this file except in compliance with the License.
8 You may obtain a copy of the License at
10 http://www.apache.org/licenses/LICENSE-2.0
15 local table = require "table"
16 local nixio = require "nixio"
17 local getmetatable, assert, pairs = getmetatable, assert, pairs
21 local BUFFERSIZE = nixio.const.buffersize
22 local ZIOBLKSIZE = 65536
23 local socket = nixio.meta_socket
24 local tls_socket = nixio.meta_tls_socket
25 local file = nixio.meta_file
27 function consume(iter)
37 function meta.is_socket(self)
38 return (getmetatable(self) == socket)
41 function meta.is_tls_socket(self)
42 return (getmetatable(self) == tls_socket)
45 function meta.is_file(self)
46 return (getmetatable(self) == file)
49 function meta.readall(self, len)
50 local block, code, msg = self:read(len or BUFFERSIZE)
53 return nil, code, msg, ""
54 elseif #block == 0 then
55 return "", nil, nil, ""
58 local data, total = {block}, #block
60 while not len or len > total do
61 block, code, msg = self:read(len and (len - total) or BUFFERSIZE)
64 return nil, code, msg, table.concat(data)
65 elseif #block == 0 then
69 data[#data+1], total = block, total + #block
72 local data = #data > 1 and table.concat(data) or data[1]
73 return data, nil, nil, data
75 meta.recvall = meta.readall
77 function meta.writeall(self, data)
78 local sent, code, msg = self:write(data)
81 return nil, code, msg, 0
86 while total < #data do
87 sent, code, msg = self:write(data, total)
90 return nil, code, msg, total
96 return total, nil, nil, total
98 meta.sendall = meta.writeall
100 function meta.linesource(self, limit)
101 limit = limit or BUFFERSIZE
104 return function(flush)
108 line = buffer:sub(bpos + 1)
115 _, endp, line = buffer:find("(.-)\r?\n", bpos + 1)
119 elseif #buffer < limit + bpos then
120 local newblock, code, msg = self:read(limit + bpos - #buffer)
122 return nil, code, msg
123 elseif #newblock == 0 then
126 buffer = buffer:sub(bpos + 1) .. newblock
135 function meta.blocksource(self, bs, limit)
136 bs = bs or BUFFERSIZE
142 elseif limit < toread then
147 local block, code, msg = self:read(toread)
150 return nil, code, msg
151 elseif #block == 0 then
155 limit = limit - #block
163 function meta.sink(self, close)
164 return function(chunk, src_err)
165 if not chunk and not src_err and close then
166 if self.shutdown then
170 elseif chunk and #chunk > 0 then
171 return self:writeall(chunk)
177 function meta.copy(self, fdout, size)
178 local source = self:blocksource(nil, size)
179 local sink = fdout:sink()
180 local sent, chunk, code, msg = 0
183 chunk, code, msg = source()
184 sink(chunk, code, msg)
185 sent = chunk and (sent + #chunk) or sent
187 return not code and sent or nil, code, msg, sent
190 function meta.copyz(self, fd, size)
191 local sent, lsent, code, msg = 0
192 if self:is_file() then
193 if nixio.sendfile and fd:is_socket() and self:stat("type") == "reg" then
195 lsent, code, msg = nixio.sendfile(fd, self, size or ZIOBLKSIZE)
198 size = size and (size - lsent)
200 until (not lsent or lsent == 0 or (size and size == 0))
201 if lsent or (not lsent and sent == 0 and
202 code ~= nixio.const.ENOSYS and code ~= nixio.const.EINVAL) then
203 return lsent and sent, code, msg, sent
208 return self:copy(fd, size)
211 function tls_socket.close(self)
212 return self.socket:close()
215 for k, v in pairs(meta) do