1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2013 Matthieu Lucas <lucasmatthieu@gmail.com>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
20 private import socket_c
21 intrude import core
::stream
23 # A general Socket, either TCP or UDP
27 private var native
: NativeSocket is noinit
29 # Is this socket closed?
32 # Set whether calls to `accept` are blocking
33 fun blocking
=(value
: Bool)
35 # We use the opposite from the native version as the native API
36 # is closer to the C API. In the Nity API, we use a positive version
38 native
.non_blocking
= not value
42 # A general TCP socket, either a `TCPStream` or a `TCPServer`
43 abstract class TCPSocket
46 # Port used by the socket
49 # IPv4 address to which `self` is connected
51 # Formatted as xxx.xxx.xxx.xxx.
52 var address
: String is noinit
55 # Simple communication stream with a remote socket
62 # Real canonical name of the host to which `self` is connected
65 private var addrin
: NativeSocketAddrIn is noinit
67 redef var end_reached
= false
69 # TODO make init private
71 # Creates a socket connection to host `host` on port `port`
72 init connect
(host
: String, port
: Int)
74 _buffer
= new CString(1024)
76 native
= new NativeSocket.socket
(new NativeSocketAddressFamilies.af_inet
,
77 new NativeSocketTypes.sock_stream
, new NativeSocketProtocolFamilies.pf_null
)
78 if native
.address_is_null
then
83 if not native
.setsockopt
(new NativeSocketOptLevels.socket
, new NativeSocketOptNames.reuseaddr
, 1) then
89 var hostent
= sys
.gethostbyname
(host
.to_cstring
)
90 if hostent
.address_is_null
then
91 # Error in name lookup
92 last_error
= new IOError.from_h_errno
100 addrin
= new NativeSocketAddrIn
101 addrin
.fill_from_hostent hostent
104 address
= addrin
.address
.to_s
105 init(addrin
.port
, hostent
.h_name
.to_s
)
107 closed
= not internal_connect
111 last_error
= new IOError.from_errno
117 # Creates a client socket, this is meant to be used by accept only
118 private init server_side
(h
: SocketAcceptResult)
122 address
= addrin
.address
.to_s
124 init(addrin
.port
, address
)
129 redef fun poll_in
do return ready_to_read
(0)
131 # Returns an array containing an enum of the events ready to be read
133 # event_types : Combination of several event types to watch
135 # timeout : Time in milliseconds before stopping listening for events on this socket
136 private fun pollin
(event_types
: Array[NativeSocketPollValues], timeout
: Int): Array[NativeSocketPollValues] do
137 if end_reached
then return new Array[NativeSocketPollValues]
138 return native
.socket_poll
(new PollFD(native
.descriptor
, event_types
), timeout
)
141 # Easier use of pollin to check for something to read on all channels of any priority
143 # timeout : Time in milliseconds before stopping to wait for events
144 fun ready_to_read
(timeout
: Int): Bool
146 if _buffer_pos
< _buffer_length
then return true
147 if end_reached
then return false
148 var events
= [new NativeSocketPollValues.pollin
]
149 return pollin
(events
, timeout
).length
!= 0
152 # Is this socket still connected?
155 if closed
then return false
156 if native
.poll_hup_err
== 0 then
164 redef fun is_writable
do return not end_reached
166 # Establishes a connection to socket addrin
168 # REQUIRES : not self.end_reached
169 private fun internal_connect
: Bool
172 return native
.connect
(addrin
) >= 0
175 # If socket.end_reached, nothing will happen
178 if closed
then return
179 native
.write
(msg
.to_cstring
, msg
.length
)
182 redef fun write_byte
(value
)
184 if closed
then return
185 native
.write_byte value
188 redef fun write_bytes_from_cstring
(ns
, len
) do
189 if closed
then return
190 native
.write
(ns
, len
)
193 fun write_ln
(msg
: Text)
195 if closed
then return
200 redef fun fill_buffer
202 if not connected
then return
204 var read
= native
.read
(_buffer
, _buffer_capacity
)
210 _buffer_length
= read
214 fun enlarge
(len
: Int) do
215 if _buffer_capacity
>= len
then return
216 _buffer_capacity
= len
218 var ns
= new CString(_buffer_capacity
)
219 _buffer
.copy_to
(ns
, _buffer_length
- _buffer_pos
, _buffer_pos
, 0)
225 if closed
then return
226 if native
.close
>= 0 then
232 # Send the data present in the socket buffer
235 if not native
.setsockopt
(new NativeSocketOptLevels.tcp
, new NativeSocketOptNames.tcp_nodelay
, 1) or
236 not native
.setsockopt
(new NativeSocketOptLevels.tcp
, new NativeSocketOptNames.tcp_nodelay
, 0) then
242 # A socket listening on a given `port` for incomming connections
244 # Create streams to communicate with clients using `accept`.
248 private var addrin
: NativeSocketAddrIn is noinit
250 # Create and bind a listening server socket on port `port`
253 native
= new NativeSocket.socket
(new NativeSocketAddressFamilies.af_inet
,
254 new NativeSocketTypes.sock_stream
, new NativeSocketProtocolFamilies.pf_null
)
255 assert not native
.address_is_null
256 if not native
.setsockopt
(new NativeSocketOptLevels.socket
, new NativeSocketOptNames.reuseaddr
, 1) then
261 addrin
= new NativeSocketAddrIn
262 addrin
.family
= new NativeSocketAddressFamilies.af_inet
266 address
= addrin
.address
.to_s
272 # Associates the socket to a local address and port
274 # Returns whether the socket has been be bound.
275 private fun bind
: Bool do
276 return native
.bind
(addrin
) >= 0
279 # Sets the socket as ready to accept incoming connections, `size` is the maximum number of queued clients
281 # Returns `true` if the socket could be set, `false` otherwise
282 fun listen
(size
: Int): Bool do
283 return native
.listen
(size
) >= 0
286 # Accepts an incoming connection from a client
288 # Create and return a new socket to the client. May return null if not
289 # `blocking` and there's no waiting clients, or upon an interruption
290 # (whether `blocking` or not).
292 # Require: not closed
293 fun accept
: nullable TCPStream
296 var native
= native
.accept
297 if native
== null then return null
298 return new TCPStream.server_side
(native
)
304 # FIXME unify with `SocketStream::close` when we can use qualified names
306 if closed
then return
307 if native
.close
>= 0 then
313 # A simple set of sockets used by `SocketObserver`
315 private var native
= new NativeSocketSet
319 # Add `socket` to this set
320 fun add
(socket
: Socket) do native
.set
(socket
.native
)
322 # Remove `socket` from this set
323 fun remove
(socket
: Socket) do native
.clear
(socket
.native
)
325 # Does this set has `socket`?
326 fun has
(socket
: Socket): Bool do return native
.is_set
(socket
.native
)
328 # Clear all sockets from this set
329 fun clear
do native
.zero
332 # Service class to manage calls to `select`
334 private var native
= new NativeSocketObserver
336 var read_set
: nullable SocketSet = null
338 var write_set
: nullable SocketSet = null
340 var except_set
: nullable SocketSet = null
342 init(read
: Bool, write
: Bool, except
: Bool)
344 if read
then read_set
= new SocketSet
345 if write
then write_set
= new SocketSet
346 if except
then except_set
= new SocketSet
349 fun select
(max
: Socket, seconds
: Int, microseconds
: Int): Bool
351 # FIXME this implementation (see the call to nullable attributes below) and
352 # `NativeSockectObserver::select` is not stable.
354 var timeval
= new NativeTimeval(seconds
, microseconds
)
355 return native
.select
(max
.native
, read_set
.native
, write_set
.native
, except_set
.native
, timeval
) > 0
359 # Socket over UDP, sends and receive data without the need for a connection
363 # Last error raised by this socket
364 var error
: nullable Error = null
366 init do native
= new NativeSocket.socket
(
367 new NativeSocketAddressFamilies.af_inet
,
368 new NativeSocketTypes.sock_dgram
,
369 new NativeSocketProtocolFamilies.pf_null
)
371 # Bind this socket to an `address`, on `port` (to all addresses if `null`)
373 # On error, sets `error` appropriately.
374 fun bind
(address
: nullable Text, port
: Int)
376 var addr_in
= new NativeSocketAddrIn
378 if address
!= null then
379 # FIXME replace all use of gethostbyname with something not obsolete
380 var hostent
= sys
.gethostbyname
(address
.to_cstring
)
381 if hostent
.address_is_null
then
382 error
= new IOError.from_h_errno
387 addr_in
.fill_from_hostent hostent
389 addr_in
.family
= new NativeSocketAddressFamilies.af_inet
393 if native
.bind
(addr_in
) != 0 then error
= new IOError.from_errno
398 # Receive `length` bytes of data from any sender
400 # On error, returns an empty string and sets `error` appropriately.
401 fun recv
(length
: Int): String
403 var buf
= new CString(length
)
404 var len
= native
.recvfrom
(buf
, length
, 0, new NativeSocketAddrIn.nul
)
406 error
= new IOError.from_errno
409 return buf
.to_s_unsafe
(len
, copy
=false)
412 # Receive `length` bytes of data from any sender and store the sender info in `sender.item`
414 # On error, returns an empty string and sets `error` appropriately.
415 fun recv_from
(length
: Int, sender
: Ref[nullable SocketAddress]): String
417 var src
= new NativeSocketAddrIn
418 var buf
= new CString(length
)
420 var len
= native
.recvfrom
(buf
, length
, 0, src
)
422 error
= new IOError.from_errno
427 sender
.item
= new SocketAddress(src
)
428 return buf
.to_s_unsafe
(len
, copy
=false)
431 # Send `data` to `dest_address` on `port`
433 # On error, sets `error` appropriately.
434 fun send_to
(dest_address
: Text, port
: Int, data
: Text)
436 var hostent
= sys
.gethostbyname
(dest_address
.to_cstring
)
437 if hostent
.address_is_null
then
438 error
= new IOError.from_h_errno
442 var dest
= new NativeSocketAddrIn
443 dest
.fill_from_hostent hostent
445 native
.setsockopt
(new NativeSocketOptLevels.socket
, new NativeSocketOptNames.broadcast
, 1)
447 var buf
= data
.to_cstring
448 if native
.sendto
(buf
, data
.length
, 0, dest
) == -1 then
449 error
= new IOError.from_errno
454 # Enable broadcasting for this socket
456 # On error, sets `error` appropriately.
457 fun enable_broadcast
=(value
: Bool) do
458 var res
= native
.setsockopt
(new NativeSocketOptLevels.socket
, new NativeSocketOptNames.broadcast
, value
.to_i
)
459 if res
== -1 then error
= new IOError.from_errno
462 # Broadcast `data` on the network on `port`
464 # On error, sets `error` appropriately.
466 # Require: setting `enable_broadcast = true`
467 fun broadcast
(port
: Int, data
: Text)
469 var addr_in
= new NativeSocketAddrIn
471 addr_in
.family
= new NativeSocketAddressFamilies.af_inet
472 addr_in
.address_broadcast
474 var buf
= data
.to_cstring
475 if native
.sendto
(buf
, data
.length
, 0, addr_in
) == -1 then
476 error
= new IOError.from_errno
483 # Address of a socket in the Internet namespace
485 # Used in one of the out parameters of `UDPSocket::recv_from`.
487 super FinalizableOnce
489 # FIXME make init private
491 private var native
: NativeSocketAddrIn
495 address
= native
.address
.to_s
500 var address
: String is noinit
503 var port
: Int is noinit
505 redef fun ==(o
) do return o
isa SocketAddress and o
.address
== address
and o
.port
== port
507 redef fun finalize_once
do native
.free
511 # Fill a new `IOError` from the message of `errno`
512 init from_errno
do init errno
.strerror
514 # Fill a new `IOError` from the message of `h_errno`
516 # Used with `gethostbyname`.
517 init from_h_errno
do init h_errno
.to_s