X-Git-Url: http://nitlanguage.org

diff --git a/lib/socket/socket.nit b/lib/socket/socket.nit
index d5f203a..2d17656 100644
--- a/lib/socket/socket.nit
+++ b/lib/socket/socket.nit
@@ -17,78 +17,503 @@
 # Socket services
 module socket
 
-import socket_c
+private import socket_c
+intrude import core::stream
 
-class Socket
-	var address: String
-	var host: nullable String
+# A general Socket, either TCP or UDP
+abstract class Socket
+
+	# Underlying C socket
+	private var native: NativeSocket is noinit
+
+	# Is this socket closed?
+	var closed = false
+
+	# Set whether calls to `accept` are blocking
+	fun blocking=(value: Bool)
+	do
+		# We use the opposite from the native version as the native API
+		# is closer to the C API. In the Nity API, we use a positive version
+		# of the name.
+		native.non_blocking = not value
+	end
+end
+
+# A general TCP socket, either a `TCPStream` or a `TCPServer`
+abstract class TCPSocket
+	super Socket
+
+	# Port used by the socket
 	var port: Int
-	private var socket: FFSocket
-	private var addrin: FFSocketAddrIn
 
-	init stream_with_host(thost: String, tport: Int)
+	# IPv4 address to which `self` is connected
+	#
+	# Formatted as xxx.xxx.xxx.xxx.
+	var address: String is noinit
+end
+
+# Simple communication stream with a remote socket
+class TCPStream
+	super TCPSocket
+	super BufferedReader
+	super Writer
+	super PollableReader
+
+	# Real canonical name of the host to which `self` is connected
+	var host: String
+
+	private var addrin: NativeSocketAddrIn is noinit
+
+	redef var end_reached = false
+
+	# TODO make init private
+
+	# Creates a socket connection to host `host` on port `port`
+	init connect(host: String, port: Int)
+	do
+		_buffer = new CString(1024)
+		_buffer_pos = 0
+		native = new NativeSocket.socket(new NativeSocketAddressFamilies.af_inet,
+			new NativeSocketTypes.sock_stream, new NativeSocketProtocolFamilies.pf_null)
+		if native.address_is_null then
+			end_reached = true
+			closed = true
+			return
+		end
+		if not native.setsockopt(new NativeSocketOptLevels.socket, new NativeSocketOptNames.reuseaddr, 1) then
+			end_reached = true
+			closed = true
+			return
+		end
+
+		var hostent = sys.gethostbyname(host.to_cstring)
+		if hostent.address_is_null then
+			# Error in name lookup
+			last_error = new IOError.from_h_errno
+
+			closed = true
+			end_reached = true
+
+			return
+		end
+
+		addrin = new NativeSocketAddrIn
+		addrin.fill_from_hostent hostent
+		addrin.port = port
+
+		address = addrin.address.to_s
+		init(addrin.port, hostent.h_name.to_s)
+
+		closed = not internal_connect
+		end_reached = closed
+		if closed then
+			# Connection failed
+			last_error = new IOError.from_errno
+		end
+
+		prepare_buffer(1024)
+	end
+
+	# Creates a client socket, this is meant to be used by accept only
+	private init server_side(h: SocketAcceptResult)
+	do
+		native = h.socket
+		addrin = h.addr_in
+		address = addrin.address.to_s
+
+		init(addrin.port, address)
+
+		prepare_buffer(1024)
+	end
+
+	redef fun poll_in do return ready_to_read(0)
+
+	# Returns an array containing an enum of the events ready to be read
+	#
+	# event_types : Combination of several event types to watch
+	#
+	# timeout : Time in milliseconds before stopping listening for events on this socket
+	private fun pollin(event_types: Array[NativeSocketPollValues], timeout: Int): Array[NativeSocketPollValues] do
+		if end_reached then return new Array[NativeSocketPollValues]
+		return native.socket_poll(new PollFD(native.descriptor, event_types), timeout)
+	end
+
+	# Easier use of pollin to check for something to read on all channels of any priority
+	#
+	# timeout : Time in milliseconds before stopping to wait for events
+	fun ready_to_read(timeout: Int): Bool
+	do
+		if _buffer_pos < _buffer_length then return true
+		if end_reached then return false
+		var events = [new NativeSocketPollValues.pollin]
+		return pollin(events, timeout).length != 0
+	end
+
+	# Is this socket still connected?
+	fun connected: Bool
+	do
+		if closed then return false
+		if native.poll_hup_err == 0 then
+			return true
+		else
+			closed = true
+			return false
+		end
+	end
+
+	redef fun is_writable do return not end_reached
+
+	# Establishes a connection to socket addrin
+	#
+	# REQUIRES : not self.end_reached
+	private fun internal_connect: Bool
+	do
+		assert not closed
+		return native.connect(addrin) >= 0
+	end
+
+	# If socket.end_reached, nothing will happen
+	redef fun write(msg)
+	do
+		if closed then return
+		native.write(msg.to_cstring, msg.length)
+	end
+
+	redef fun write_byte(value)
+	do
+		if closed then return
+		native.write_byte value
+	end
+
+	redef fun write_bytes(bytes) do
+		if closed then return
+		var s = bytes.to_s
+		native.write(s.to_cstring, s.length)
+	end
+
+	fun write_ln(msg: Text)
 	do
-		socket = new FFSocket.socket( new FFSocketAddressFamilies.af_inet, new FFSocketTypes.sock_stream, new FFSocketProtocolFamilies.pf_null )
-		var hostname = socket.gethostbyname(thost)
-		addrin = new FFSocketAddrIn.with_hostent(hostname, tport)
-		address = addrin.address
-		host = hostname.h_name
-		port = addrin.port
+		if closed then return
+		write msg.to_s
+		write "\n"
 	end
 
-	init stream_with_port(tport: Int)
+	redef fun fill_buffer
+	do
+		if not connected then return
+
+		var read = native.read(_buffer, _buffer_capacity)
+		if read == -1 then
+			close
+			end_reached = true
+		end
+
+		_buffer_length = read
+		_buffer_pos = 0
+	end
+
+	fun enlarge(len: Int) do
+		if _buffer_capacity >= len then return
+		_buffer_capacity = len
+
+		var ns = new CString(_buffer_capacity)
+		_buffer.copy_to(ns, _buffer_length - _buffer_pos, _buffer_pos, 0)
+		_buffer = ns
+	end
+
+	redef fun close
+	do
+		if closed then return
+		if native.close >= 0 then
+			closed = true
+			end_reached = true
+		end
+	end
+
+	# Send the data present in the socket buffer
+	fun flush
+	do
+		if not native.setsockopt(new NativeSocketOptLevels.tcp, new NativeSocketOptNames.tcp_nodelay, 1) or
+		   not native.setsockopt(new NativeSocketOptLevels.tcp, new NativeSocketOptNames.tcp_nodelay, 0) then
+			closed = true
+		end
+	end
+end
+
+# A socket listening on a given `port` for incomming connections
+#
+# Create streams to communicate with clients using `accept`.
+class TCPServer
+	super TCPSocket
+
+	private var addrin: NativeSocketAddrIn is noinit
+
+	# Create and bind a listening server socket on port `port`
+	init
 	do
-		socket = new FFSocket.socket( new FFSocketAddressFamilies.af_inet, new FFSocketTypes.sock_stream, new FFSocketProtocolFamilies.pf_null )
-		addrin = new FFSocketAddrIn.with(tport, new FFSocketAddressFamilies.af_inet)
-		address = addrin.address
-		port = addrin.port
-		host = null
+		native = new NativeSocket.socket(new NativeSocketAddressFamilies.af_inet,
+			new NativeSocketTypes.sock_stream, new NativeSocketProtocolFamilies.pf_null)
+		assert not native.address_is_null
+		if not native.setsockopt(new NativeSocketOptLevels.socket, new NativeSocketOptNames.reuseaddr, 1) then
+			closed = true
+			return
+		end
+
+		addrin = new NativeSocketAddrIn
+		addrin.family = new NativeSocketAddressFamilies.af_inet
+		addrin.port = port
+		addrin.address_any
+
+		address = addrin.address.to_s
+
+		# Bind it
+		closed = not bind
 	end
 
-	init primitive_init(h: FFSocketAcceptResult)
+	# Associates the socket to a local address and port
+	#
+	# Returns whether the socket has been be bound.
+	private fun bind: Bool do
+		return native.bind(addrin) >= 0
+	end
+
+	# Sets the socket as ready to accept incoming connections, `size` is the maximum number of queued clients
+	#
+	# Returns `true` if the socket could be set, `false` otherwise
+	fun listen(size: Int): Bool do
+		return native.listen(size) >= 0
+	end
+
+	# Accepts an incoming connection from a client
+	#
+	# Create and return a new socket to the client. May return null if not
+	# `blocking` and there's no waiting clients, or upon an interruption
+	# (whether `blocking` or not).
+	#
+	# Require: not closed
+	fun accept: nullable TCPStream
 	do
-		socket = h.socket
-		addrin = h.addrIn
-		address = addrin.address
-		port = addrin.port
-		host = null
+		assert not closed
+		var native = native.accept
+		if native == null then return null
+		return new TCPStream.server_side(native)
 	end
 
-	fun connect: Bool do return socket.connect(addrin) >= 0
-	fun write(msg: String): Bool do return socket.write(msg) >= 0
-	fun read: String do return socket.read
-	fun close: Bool do return socket.close >= 0
-	fun bind: Bool do return socket.bind(addrin) >= 0
-	fun listen(size: Int): Bool do return socket.listen(size) >= 0
-	fun accept: Socket do return new Socket.primitive_init(socket.accept)
-	fun errno: Int do return socket.errno
+	# Close this socket
+	fun close
+	do
+		# FIXME unify with `SocketStream::close` when we can use qualified names
+
+		if closed then return
+		if native.close >= 0 then
+			closed = true
+		end
+	end
 end
 
+# A simple set of sockets used by `SocketObserver`
 class SocketSet
-	var sset: FFSocketSet
-	init do sset = new FFSocketSet end
-	fun set(s: Socket) do sset.set(s.socket) end
-	fun is_set(s: Socket): Bool do return sset.is_set(s.socket) end
-	fun zero do sset.zero end
-	fun clear(s: Socket) do sset.clear(s.socket) end
+	private var native = new NativeSocketSet
+
+	init do clear
+
+	# Add `socket` to this set
+	fun add(socket: Socket) do native.set(socket.native)
+
+	# Remove `socket` from this set
+	fun remove(socket: Socket) do native.clear(socket.native)
+
+	# Does this set has `socket`?
+	fun has(socket: Socket): Bool do return native.is_set(socket.native)
+
+	# Clear all sockets from this set
+	fun clear do native.zero
 end
 
+# Service class to manage calls to `select`
 class SocketObserver
-	private var observer: FFSocketObserver
-	var readset: nullable SocketSet = null
-	var writeset: nullable SocketSet = null
-	var exceptset: nullable SocketSet = null
-	init(read :Bool, write :Bool, except: Bool)
-	do
-		if read then readset = new SocketSet
-		if write then writeset = new SocketSet
-		if except then exceptset = new SocketSet
-		observer = new FFSocketObserver
-	end	
-	fun select(max: Socket,seconds: Int, microseconds: Int): Bool
-	do
-		var timeval = new FFTimeval(seconds, microseconds)
-		return observer.select(max.socket, readset.sset, writeset.sset, readset.sset, timeval) > 0
+	private var native = new NativeSocketObserver
+
+	var read_set: nullable SocketSet = null
+
+	var write_set: nullable SocketSet = null
+
+	var except_set: nullable SocketSet = null
+
+	init(read: Bool, write: Bool, except: Bool)
+	is old_style_init do
+		if read then read_set = new SocketSet
+		if write then write_set = new SocketSet
+		if except then except_set = new SocketSet
+	end
+
+	fun select(max: Socket, seconds: Int, microseconds: Int): Bool
+	do
+		# FIXME this implementation (see the call to nullable attributes below) and
+		# `NativeSockectObserver::select` is not stable.
+
+		var timeval = new NativeTimeval(seconds, microseconds)
+		return native.select(max.native, read_set.native, write_set.native, except_set.native, timeval) > 0
+	end
+end
+
+# Socket over UDP, sends and receive data without the need for a connection
+class UDPSocket
+	super Socket
+
+	# Last error raised by this socket
+	var error: nullable Error = null
+
+	init do native = new NativeSocket.socket(
+			new NativeSocketAddressFamilies.af_inet,
+			new NativeSocketTypes.sock_dgram,
+			new NativeSocketProtocolFamilies.pf_null)
+
+	# Bind this socket to an `address`, on `port` (to all addresses if `null`)
+	#
+	# On error, sets `error` appropriately.
+	fun bind(address: nullable Text, port: Int)
+	do
+		var addr_in = new NativeSocketAddrIn
+		addr_in.port = port
+		if address != null then
+			# FIXME replace all use of gethostbyname with something not obsolete
+			var hostent = sys.gethostbyname(address.to_cstring)
+			if hostent.address_is_null then
+				error = new IOError.from_h_errno
+				addr_in.free
+				return
+			end
+
+			addr_in.fill_from_hostent hostent
+		else
+			addr_in.family = new NativeSocketAddressFamilies.af_inet
+			addr_in.address_any
+		end
+
+		if native.bind(addr_in) != 0 then error = new IOError.from_errno
+
+		addr_in.free
+	end
+
+	# Receive `length` bytes of data from any sender
+	#
+	# On error, returns an empty string and sets `error` appropriately.
+	fun recv(length: Int): String
+	do
+		var buf = new CString(length)
+		var len = native.recvfrom(buf, length, 0, new NativeSocketAddrIn.nul)
+		if len == -1 then
+			error = new IOError.from_errno
+			return ""
+		end
+		return buf.to_s_with_length(len)
+	end
+
+	# Receive `length` bytes of data from any sender and store the sender info in `sender.item`
+	#
+	# On error, returns an empty string and sets `error` appropriately.
+	fun recv_from(length: Int, sender: Ref[nullable SocketAddress]): String
+	do
+		var src = new NativeSocketAddrIn
+		var buf = new CString(length)
+
+		var len = native.recvfrom(buf, length, 0, src)
+		if len == -1 then
+			error = new IOError.from_errno
+			src.free
+			return ""
+		end
+
+		sender.item = new SocketAddress(src)
+		return buf.to_s_with_length(len)
+	end
+
+	# Send `data` to `dest_address` on `port`
+	#
+	# On error, sets `error` appropriately.
+	fun send_to(dest_address: Text, port: Int, data: Text)
+	do
+		var hostent = sys.gethostbyname(dest_address.to_cstring)
+		if hostent.address_is_null then
+			error = new IOError.from_h_errno
+			return
+		end
+
+		var dest = new NativeSocketAddrIn
+		dest.fill_from_hostent hostent
+		dest.port = port
+		native.setsockopt(new NativeSocketOptLevels.socket, new NativeSocketOptNames.broadcast, 1)
+
+		var buf = data.to_cstring
+		if native.sendto(buf, data.length, 0, dest) == -1 then
+			error = new IOError.from_errno
+		end
+		dest.free
+	end
+
+	# Enable broadcasting for this socket
+	#
+	# On error, sets `error` appropriately.
+	fun enable_broadcast=(value: Bool) do
+		var res = native.setsockopt(new NativeSocketOptLevels.socket, new NativeSocketOptNames.broadcast, value.to_i)
+		if res == -1 then error = new IOError.from_errno
+	end
+
+	# Broadcast `data` on the network on `port`
+	#
+	# On error, sets `error` appropriately.
+	#
+	# Require: setting `enable_broadcast = true`
+	fun broadcast(port: Int, data: Text)
+	do
+		var addr_in = new NativeSocketAddrIn
+		addr_in.port = port
+		addr_in.family = new NativeSocketAddressFamilies.af_inet
+		addr_in.address_broadcast
+
+		var buf = data.to_cstring
+		if native.sendto(buf, data.length, 0, addr_in) == -1 then
+			error = new IOError.from_errno
+		end
+
+		addr_in.free
 	end
 end
 
+# Address of a socket in the Internet namespace
+#
+# Used in one of the out parameters of `UDPSocket::recv_from`.
+class SocketAddress
+	super FinalizableOnce
+
+	# FIXME make init private
+
+	private var native: NativeSocketAddrIn
+
+	init
+	do
+		address = native.address.to_s
+		port = native.port
+	end
+
+	# Internet address
+	var address: String is noinit
+
+	# Port of the socket
+	var port: Int is noinit
+
+	redef fun ==(o) do return o isa SocketAddress and o.address == address and o.port == port
+
+	redef fun finalize_once do native.free
+end
+
+redef class IOError
+	# Fill a new `IOError` from the message of `errno`
+	init from_errno do init errno.strerror
+
+	# Fill a new `IOError` from the message of `h_errno`
+	#
+	# Used with `gethostbyname`.
+	init from_h_errno do init h_errno.to_s
+end