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;;;; $Id$
;;;; $URL$
;; MCL backend for USOCKET 0.4.1
;; Terje Norderhaug <terje@in-progress.com>, January 1, 2009
(in-package :usocket)
(defun handle-condition (condition &optional socket)
; incomplete, needs to handle additional conditions
(flet ((raise-error (&optional socket-condition)
(if socket-condition
(error socket-condition :socket socket)
(error 'unknown-error :socket socket :real-error condition))))
(typecase condition
(ccl:host-stopped-responding
(raise-error 'host-down-error))
(ccl:host-not-responding
(raise-error 'host-unreachable-error))
(ccl:connection-reset
(raise-error 'connection-reset-error))
(ccl:connection-timed-out
(raise-error 'timeout-error))
(ccl:opentransport-protocol-error
(raise-error 'protocol-not-supported-error))
(otherwise
(raise-error)))))
(defun socket-connect (host port &key (element-type 'character) timeout deadline nodelay
local-host local-port (protocol :stream))
(when (eq nodelay :if-supported)
(setf nodelay t))
(ecase protocol
(:stream
(with-mapped-conditions ()
(let* ((socket
(make-instance 'active-socket
:remote-host (when host (host-to-hostname host))
:remote-port port
:local-host (when local-host (host-to-hostname local-host))
:local-port local-port
:deadline deadline
:nodelay nodelay
:connect-timeout (and timeout (round (* timeout 60)))
:element-type element-type))
(stream (socket-open-stream socket)))
(make-stream-socket :socket socket :stream stream))))
(:datagram
(with-mapped-conditions ()
(make-datagram-socket
(ccl::open-udp-socket :local-address (and local-host (host-to-hbo local-host))
:local-port local-port))))))
(defun socket-listen (host port
&key reuseaddress
(reuse-address nil reuse-address-supplied-p)
(backlog 5)
(element-type 'character))
(let* ((reuseaddress (if reuse-address-supplied-p reuse-address reuseaddress))
(socket (with-mapped-conditions ()
(make-instance 'passive-socket
:local-port port
:local-host (host-to-hbo host)
:reuse-address reuseaddress
:backlog backlog))))
(make-stream-server-socket socket :element-type element-type)))
(defmethod socket-accept ((usocket stream-server-usocket) &key element-type)
(let* ((socket (socket usocket))
(stream (with-mapped-conditions (usocket)
(socket-accept socket :element-type element-type))))
(make-stream-socket :socket socket :stream stream)))
(defmethod socket-close ((usocket usocket))
(with-mapped-conditions (usocket)
(socket-close (socket usocket))))
(defmethod ccl::stream-close ((usocket usocket))
(socket-close usocket))
(defun get-hosts-by-name (name)
(with-mapped-conditions ()
(list (hbo-to-vector-quad (ccl::get-host-address
(host-to-hostname name))))))
(defun get-host-by-address (address)
(with-mapped-conditions ()
(ccl::inet-host-name (host-to-hbo address))))
(defmethod get-local-name ((usocket usocket))
(values (get-local-address usocket)
(get-local-port usocket)))
(defmethod get-peer-name ((usocket stream-usocket))
(values (get-peer-address usocket)
(get-peer-port usocket)))
(defmethod get-local-address ((usocket usocket))
(hbo-to-vector-quad (ccl::get-host-address (or (local-host (socket usocket)) ""))))
(defmethod get-local-port ((usocket usocket))
(local-port (socket usocket)))
(defmethod get-peer-address ((usocket stream-usocket))
(hbo-to-vector-quad (ccl::get-host-address (remote-host (socket usocket)))))
(defmethod get-peer-port ((usocket stream-usocket))
(remote-port (socket usocket)))
(defun %setup-wait-list (wait-list)
(declare (ignore wait-list)))
(defun %add-waiter (wait-list waiter)
(declare (ignore wait-list waiter)))
(defun %remove-waiter (wait-list waiter)
(declare (ignore wait-list waiter)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; BASIC MCL SOCKET IMPLEMENTATION
(defclass socket ()
((local-port :reader local-port :initarg :local-port)
(local-host :reader local-host :initarg :local-host)
(element-type :reader element-type :initform 'ccl::base-character :initarg :element-type)))
(defclass active-socket (socket)
((remote-host :reader remote-host :initarg :remote-host)
(remote-port :reader remote-port :initarg :remote-port)
(deadline :initarg :deadline)
(nodelay :initarg :nodelay)
(connect-timeout :reader connect-timeout :initform NIL :initarg :connect-timeout
:type (or null fixnum) :documentation "ticks (60th of a second)")))
(defmethod socket-open-stream ((socket active-socket))
(ccl::open-tcp-stream (or (remote-host socket)(ccl::local-interface-ip-address)) (remote-port socket)
:element-type (if (subtypep (element-type socket) 'character) 'ccl::base-character 'unsigned-byte)
:connect-timeout (connect-timeout socket)))
(defmethod socket-close ((socket active-socket))
NIL)
(defclass passive-socket (socket)
((streams :accessor socket-streams :type list :initform NIL
:documentation "Circular list of streams with first element the next to open")
(reuse-address :reader reuse-address :initarg :reuse-address)
(lock :reader socket-lock :initform (ccl:make-lock "Socket"))))
(defmethod initialize-instance :after ((socket passive-socket) &key backlog)
(loop repeat backlog
collect (socket-open-listener socket) into streams
finally (setf (socket-streams socket)
(cdr (rplacd (last streams) streams))))
(when (zerop (local-port socket))
(setf (slot-value socket 'local-port)
(or (ccl::process-wait-with-timeout "binding port" (* 10 60)
#'ccl::stream-local-port (car (socket-streams socket)))
(error "timeout")))))
(defmethod socket-accept ((socket passive-socket) &key element-type &aux (lock (socket-lock socket)))
(flet ((connection-established-p (stream)
(ccl::with-io-buffer-locked ((ccl::stream-io-buffer stream nil))
(let ((state (ccl::opentransport-stream-connection-state stream)))
(not (eq :unbnd state))))))
(with-mapped-conditions ()
(ccl:with-lock-grabbed (lock nil "Socket Lock")
(let ((connection (shiftf (car (socket-streams socket))
(socket-open-listener socket element-type))))
(pop (socket-streams socket))
(ccl:process-wait "Accepting" #'connection-established-p connection)
connection)))))
(defmethod socket-close ((socket passive-socket))
(loop
with streams = (socket-streams socket)
for (stream tail) on streams
do (close stream :abort T)
until (eq tail streams)
finally (setf (socket-streams socket) NIL)))
(defmethod socket-open-listener (socket &optional element-type)
; see http://code.google.com/p/mcl/issues/detail?id=28
(let* ((ccl::*passive-interface-address* (local-host socket))
(new (ccl::open-tcp-stream NIL (or (local-port socket) #$kOTAnyInetAddress)
:reuse-local-port-p (reuse-address socket)
:element-type (if (subtypep (or element-type (element-type socket))
'character)
'ccl::base-character
'unsigned-byte))))
(declare (special ccl::*passive-interface-address*))
new))
(defmethod input-available-p ((stream ccl::opentransport-stream))
(macrolet ((when-io-buffer-lock-grabbed ((lock &optional multiple-value-p) &body body)
"Evaluates the body if and only if the lock is successfully grabbed"
;; like with-io-buffer-lock-grabbed but returns immediately instead of polling the lock
(let ((needs-unlocking-p (gensym))
(lock-var (gensym)))
`(let* ((,lock-var ,lock)
(ccl::*grabbed-io-buffer-locks* (cons ,lock-var ccl::*grabbed-io-buffer-locks*))
(,needs-unlocking-p (needs-unlocking-p ,lock-var)))
(declare (dynamic-extent ccl::*grabbed-io-buffer-locks*))
(when ,needs-unlocking-p
(,(if multiple-value-p 'multiple-value-prog1 'prog1)
(progn ,@body)
(ccl::%release-io-buffer-lock ,lock-var)))))))
(labels ((needs-unlocking-p (lock)
(declare (type ccl::lock lock))
;; crucial - clears bogus lock.value as in grab-io-buffer-lock-out-of-line:
(ccl::%io-buffer-lock-really-grabbed-p lock)
(ccl:store-conditional lock nil ccl:*current-process*)))
"similar to stream-listen on buffered-input-stream-mixin but without waiting for lock"
(let ((io-buffer (ccl::stream-io-buffer stream)))
(or (not (eql 0 (ccl::io-buffer-incount io-buffer)))
(ccl::io-buffer-untyi-char io-buffer)
(locally (declare (optimize (speed 3) (safety 0)))
(when-io-buffer-lock-grabbed ((ccl::io-buffer-lock io-buffer))
(funcall (ccl::io-buffer-listen-function io-buffer) stream io-buffer))))))))
(defmethod connection-established-p ((stream ccl::opentransport-stream))
(ccl::with-io-buffer-locked ((ccl::stream-io-buffer stream nil))
(let ((state (ccl::opentransport-stream-connection-state stream)))
(not (eq :unbnd state)))))
(defun wait-for-input-internal (wait-list &key timeout &aux result)
(labels ((ready-sockets (sockets)
(dolist (sock sockets result)
(when (cond ((stream-usocket-p sock)
(input-available-p (socket-stream sock)))
((stream-server-usocket-p sock)
(let ((ot-stream (first (socket-streams (socket sock)))))
(or (input-available-p ot-stream)
(connection-established-p ot-stream)))))
(push sock result)))))
(with-mapped-conditions ()
(ccl:process-wait-with-timeout
"socket input"
(when timeout (truncate (* timeout 60)))
#'ready-sockets
(wait-list-waiters wait-list)))
(nreverse result)))
;;; datagram socket methods
(defmethod initialize-instance :after ((usocket datagram-usocket) &key)
(with-slots (socket send-buffer recv-buffer) usocket
(setq send-buffer
(ccl::make-TUnitData (ccl::ot-conn-endpoint socket)))
(setq recv-buffer
(ccl::make-TUnitData (ccl::ot-conn-endpoint socket)))))
(defmethod socket-send ((usocket datagram-usocket) buffer size &key host port (offset 0))
(with-mapped-conditions (usocket)
(with-slots (socket send-buffer) usocket
(unless (and host port)
(unsupported 'host 'socket-send))
(ccl::send-message socket send-buffer buffer size host port offset))))
(defmethod socket-receive ((usocket datagram-usocket) buffer length &key)
(with-mapped-conditions (usocket)
(with-slots (socket recv-buffer) usocket
(ccl::receive-message socket recv-buffer buffer length))))
(defmethod socket-close ((socket datagram-usocket))
nil) ; TODO
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