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

diff --git a/lib/socket/socket.nit b/lib/socket/socket.nit
index 9824111..983164c 100644
--- a/lib/socket/socket.nit
+++ b/lib/socket/socket.nit
@@ -17,216 +17,486 @@
 # Socket services
 module socket
 
-import socket_c
+private import socket_c
+intrude import core::stream
 
-# Portal for communication between two machines
-class Socket
-	super BufferedIStream
-	super OStream
+# A general Socket, either TCP or UDP
+abstract class Socket
 
-	# IPv4 address the socket is connected to
-	# Formatted as xxx.xxx.xxx.xxx
-	var address: String
+	# 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
 
-	# Hostname of the socket connected to self
-	# In C : The real canonical host name (e.g. example.org)
-	var host: nullable String
+# A general TCP socket, either a `TCPStream` or a `TCPServer`
+abstract class TCPSocket
+	super Socket
 
-	# Port open for the socket
+	# Port used by the socket
 	var port: Int
 
-	# Underlying C socket
-	private var socket: FFSocket
+	# IPv4 address to which `self` is connected
+	#
+	# Formatted as xxx.xxx.xxx.xxx.
+	var address: String is noinit
+end
 
-	# Underlying C socket
-	private var addrin: FFSocketAddrIn
+# Simple communication stream with a remote socket
+class TCPStream
+	super TCPSocket
+	super PollableReader
+	super Duplex
+
+	# 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
+	redef var closed = false
 
-	# Creates a socket connection to host `thost` on port `port`
-	init client(thost: String, tport: Int)
+	# TODO make init private
+
+	# Creates a socket connection to host `host` on port `port`
+	init connect(host: String, port: Int)
 	do
-		_buffer = new FlatBuffer
-		_buffer_pos = 0
-		socket = new FFSocket.socket( new FFSocketAddressFamilies.af_inet, new FFSocketTypes.sock_stream, new FFSocketProtocolFamilies.pf_null )
-		if socket.address_is_null then
-			end_reached = true
+		native = new NativeSocket.socket(new NativeSocketAddressFamilies.af_inet,
+			new NativeSocketTypes.sock_stream, new NativeSocketProtocolFamilies.pf_unspec)
+		if native.address_is_null then
+			closed = true
+			return
+		end
+		if not native.setsockopt(new NativeSocketOptLevels.socket, new NativeSocketOptNames.reuseaddr, 1) then
+			closed = true
 			return
 		end
-		socket.setsockopt(new FFSocketOptLevels.socket, new FFSocketOptNames.reuseaddr, 1)
-		var hostname = socket.gethostbyname(thost)
-		addrin = new FFSocketAddrIn.with_hostent(hostname, tport)
-		address = addrin.address
-		host = hostname.h_name
-		port = addrin.port
-		if not end_reached then end_reached = not connect
-	end
-
-	# Creates a server socket on port `tport`, with a connection queue of size `max`
-	init server(tport: Int, max: Int)
-	do
-		_buffer = new FlatBuffer
-		_buffer_pos = 0
-		socket = new FFSocket.socket( new FFSocketAddressFamilies.af_inet, new FFSocketTypes.sock_stream, new FFSocketProtocolFamilies.pf_null )
-		if socket.address_is_null then
-			end_reached = true
+
+		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
+
 			return
 		end
-		socket.setsockopt(new FFSocketOptLevels.socket, new FFSocketOptNames.reuseaddr, 1)
-		addrin = new FFSocketAddrIn.with(tport, new FFSocketAddressFamilies.af_inet)
-		address = addrin.address
-		port = addrin.port
-		host = null
-		bind
-		listen(max)
+
+		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
+		if closed then
+			# Connection failed
+			last_error = new IOError.from_errno
+		end
 	end
 
 	# Creates a client socket, this is meant to be used by accept only
-	private init primitive_init(h: FFSocketAcceptResult)
+	private init server_side(h: SocketAcceptResult)
 	do
-		_buffer = new FlatBuffer
-		_buffer_pos = 0
-		socket = h.socket
-		addrin = h.addrIn
-		address = addrin.address
-		port = addrin.port
-		host = null
+		native = h.socket
+		addrin = h.addr_in
+		address = addrin.address.to_s
+
+		init(addrin.port, address)
 	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 poll_in(event_types: Array[FFSocketPollValues], timeout: Int): Array[FFSocketPollValues] do
-		if not still_alive then return new Array[FFSocketPollValues]
-		return socket.socket_poll(new PollFD(socket.descriptor, event_types), timeout)
+	private fun pollin(event_types: Array[NativeSocketPollValues], timeout: Int): Array[NativeSocketPollValues] do
+		if closed then return new Array[NativeSocketPollValues]
+		return native.socket_poll(new PollFD.from_poll_values(native.descriptor, event_types), timeout)
 	end
 
-	# Easier use of poll_in to check for something to read on all channels of any priority
+	# 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 eof then return false
-		var events = new Array[FFSocketPollValues]
-		events.push(new FFSocketPollValues.pollin)
-		return poll_in(events, timeout).length != 0
+		var events = [new NativeSocketPollValues.pollin]
+		return pollin(events, timeout).length != 0
 	end
 
-	# Checks if the socket still is connected
-	#
+	# Is this socket still connected?
 	fun connected: Bool
 	do
-		if eof then return false
-		var events = new Array[FFSocketPollValues]
-		events.push(new FFSocketPollValues.pollhup)
-		events.push(new FFSocketPollValues.pollerr)
-		return poll_in(events, 0).length == 0
+		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
+	redef fun is_writable do return not closed
 
 	# Establishes a connection to socket addrin
 	#
 	# REQUIRES : not self.end_reached
-	private fun connect: Bool
+	private fun internal_connect: Bool
 	do
-		assert not end_reached
-		return socket.connect(addrin) >= 0
+		assert not closed
+		return native.connect(addrin) >= 0
+	end
+
+	redef fun raw_read_byte do
+		var rd = native.read(write_buffer, 1)
+		if rd < 1 then return -1
+		return write_buffer[0].to_i
+	end
+
+	redef fun raw_read_bytes(ns, max) do
+		var rd = native.read(ns, max)
+		print "Read {rd} bytes"
+		if rd < 0 then return -1
+		return rd
 	end
 
 	# If socket.end_reached, nothing will happen
-	redef fun write(msg: Text)
+	redef fun write(msg)
 	do
-		if end_reached then return
-		socket.write(msg.to_s)
+		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_from_cstring(ns, len) do
+		if closed then return
+		native.write(ns, len)
+	end
+
+	# Write `msg`, with a trailing `\n`
 	fun write_ln(msg: Text)
 	do
-		if end_reached then return
-		write(msg.to_s)
-		write("\n")
+		if closed then return
+		write msg.to_s
+		write "\n"
+	end
+
+	redef fun close
+	do
+		if closed then return
+		if native.close >= 0 then
+			closed = true
+		end
 	end
 
-	redef fun fill_buffer
+	# Send the data present in the socket buffer
+	fun flush
 	do
-		_buffer.clear
-		_buffer_pos = 0
-		if not connected then return
-		var read = socket.read
-		if read.length == 0 then
-			close
-			end_reached = true
+		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
-		_buffer.append(read)
 	end
+end
+
+# A socket listening on a given `port` for incomming connections
+#
+# Create streams to communicate with clients using `accept`.
+class TCPServer
+	super TCPSocket
 
-	redef fun close do
-		if end_reached then return
-		if socket.close >= 0 then
-			end_reached = true
+	private var addrin: NativeSocketAddrIn is noinit
+
+	# Create and bind a listening server socket on port `port`
+	init
+	do
+		native = new NativeSocket.socket(new NativeSocketAddressFamilies.af_inet,
+			new NativeSocketTypes.sock_stream, new NativeSocketProtocolFamilies.pf_unspec)
+		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
 
 	# Associates the socket to a local address and port
 	#
-	# Returns : `true` if the socket could be bound, `false` otherwise
+	# Returns whether the socket has been be bound.
 	private fun bind: Bool do
-		if end_reached then return false
-		return socket.bind(addrin) >= 0
+		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
-	private fun listen(size: Int): Bool do
-		if end_reached then return false
-		return socket.listen(size) >= 0
+	# 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
-	# This creates a new socket that represents the connection to a client
 	#
-	# Returns : the socket for communication with the 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).
 	#
-	# REQUIRES : not self.end_reached
-	fun accept: Socket do
-		assert not end_reached
-		return new Socket.primitive_init(socket.accept)
+	# Require: not closed
+	fun accept: nullable TCPStream
+	do
+		assert not closed
+		var native = native.accept
+		if native == null then return null
+		return new TCPStream.server_side(native)
 	end
 
+	# 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
+
+	# Set of file descriptors on which to watch read events
+	var read_set: nullable SocketSet = null
+
+	# Set of file descriptors on which to watch write events
+	var write_set: nullable SocketSet = null
+
+	# Set of file descriptors on which to watch exception events
+	var except_set: nullable SocketSet = null
+
+	# Initialize a socket observer
+	init with_sets(read: Bool, write: Bool, except: Bool) do
+		if read then read_set = new SocketSet
+		if write then write_set = new SocketSet
+		if except then except_set = new SocketSet
+	end
+
+	# Watch for changes in the states of several sockets.
+	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)
+		var rd = if read_set != null then read_set.as(not null).native else null
+		var wrt = if write_set != null then write_set.as(not null).native else null
+		var expt = if except_set != null then except_set.as(not null).native else null
+		return native.select(max.native, rd, wrt, expt, 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_unspec)
+
+	# 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_unsafe(len, copy=false)
+	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_unsafe(len, copy=false)
+	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