Hash :
840d99d1
Author :
Thomas de Grivel
Date :
2019-01-16T17:29:23
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;;
;; Thot - http web server
;; Copyright 2017,2018 Thomas de Grivel <thoxdg@gmail.com> 0614550127
;;
(in-package :thot)
;; epoll infos
(defclass epoll-infos ()
((fd :initarg :fd
:reader epoll-fd
:type (unsigned-byte 31))
(agents :initform (make-hash-table)
:reader epoll-agents
:type hash-table)))
;; Generic epoll agent class
(defclass agent ()
((fd :initarg :fd
:reader agent-fd
:type (unsigned-byte 31))
(pending :initform nil
:accessor agent-pending
:type boolean)))
(defgeneric agent-epoll-events (agent))
(defgeneric agent-error (epoll agent))
(defgeneric agent-in (epoll agent))
(defgeneric agent-out (epoll agent))
(define-condition agent-error (error)
((agent :initarg :agent
:reader agent-error-agent
:type agent)))
;; Adding an agent
(defmacro get-agent (epoll fd)
`(gethash ,fd (epoll-agents ,epoll)))
(defun remove-agent (epoll fd)
(declare (type epoll-infos epoll))
(remhash fd (epoll-agents epoll)))
(defun epoll-add (epoll agent)
(declare (type epoll-infos epoll))
(let ((fd (agent-fd agent)))
(set-nonblocking fd)
(setf (get-agent epoll fd) agent)
(epoll:add (epoll-fd epoll) fd
(agent-epoll-events agent)
:data-fd fd)))
(defun epoll-mod (epoll agent events)
(declare (type epoll-infos epoll))
(let ((fd (agent-fd agent)))
(epoll:mod (epoll-fd epoll) fd events :data-fd fd)))
(defun epoll-del (epoll agent)
(declare (type epoll-infos epoll))
(setf (agent-pending agent) t)
(let ((fd (agent-fd agent)))
(epoll:del (epoll-fd epoll) fd)
(socket:shutdown fd t t)
(unistd:close fd)
(remove-agent epoll fd)))
;; Worker agent
(defclass worker (agent)
((addr :initarg :addr
:reader worker-addr)
(keep-alive :initform nil
:accessor worker-keep-alive
:type boolean)
(reader-cont :initarg :reader-cont
:accessor worker-reader-cont
:type (or null function))
(reply :initarg :reply
:accessor worker-reply
:type reply)
(request :initarg :request
:accessor worker-request
:type request)))
(defmethod agent-epoll-events ((worker worker))
(logior epoll:+in+ epoll:+out+ epoll:+err+))
(define-condition worker-error (agent-error)
())
(defmethod agent-error ((epoll epoll-infos) (worker worker))
(epoll-del epoll worker))
(defmethod agent-in ((epoll epoll-infos) (worker worker))
(let ((reader-cont (worker-reader-cont worker)))
(if reader-cont
(let ((result (funcall reader-cont)))
(cond ((null result) (setf (worker-reader-cont worker) nil))
((eq :keep-alive result)
(let ((request (worker-request worker))
(reply (worker-reply worker)))
(setf (worker-reader-cont worker)
(request-reader (reset-request request)
(reset-reply reply)))))
((functionp result) (setf (worker-reader-cont worker)
result))
((eq :eof result) (epoll-del epoll worker))
(t (error "worker input error ~S" worker))))
(when (= 0 (stream-output-length
(reply-stream (worker-reply worker))))
(epoll-del epoll worker)))))
(defmethod agent-out ((epoll epoll-infos) (worker worker))
(let* ((request (worker-request worker))
(reply (worker-reply worker))
(babel-stream (reply-stream reply))
(stream (stream-underlying-stream babel-stream)))
(case (stream-flush-output stream)
((:eof) (epoll-del epoll worker)))
(unless (worker-reader-cont worker)
(when (= 0 (stream-output-length stream))
(epoll-del epoll worker)))))
;; Acceptor agent
(defclass acceptor (agent)
())
(defmethod agent-epoll-events ((agent acceptor))
(logior epoll:+in+ epoll:+err+))
(define-condition acceptor-error (agent-error)
())
(defmethod agent-error ((epoll epoll-infos) (acceptor acceptor))
(error 'acceptor-error :agent acceptor))
(defun make-worker (fd addr)
(let* ((request-stream (babel-input-stream (unistd-input-stream fd)))
(reply-stream (babel-output-stream
(multi-buffered-output-stream
(unistd-output-stream fd))))
(request (make-instance 'request :stream request-stream
:remote-addr (socket:sockaddr-to-string
addr)))
(reply (make-instance 'reply :stream reply-stream))
(reader-cont (request-reader request reply)))
(make-instance 'worker
:addr addr
:fd fd
:reader-cont reader-cont
:request request
:reply reply)))
(defmethod agent-in ((epoll epoll-infos) (acceptor acceptor))
(multiple-value-bind (fd addr) (socket:accept (agent-fd acceptor))
(unless (eq :non-blocking fd)
(let ((worker (make-worker fd addr)))
(epoll-add epoll worker)))))
(defclass control (agent)
())
(defmethod agent-epoll-events ((agent control))
epoll:+in+)
(defmethod agent-in ((epoll epoll-infos) (agent control))
(setq *stop* t))
;; Thread event loop
(defun acceptor-loop-epoll (listenfd &optional pipe)
(declare (type unistd:file-descriptor listenfd))
(epoll:with (epoll-fd)
(let ((epoll (make-instance 'epoll-infos :fd epoll-fd)))
(epoll-add epoll (make-instance 'acceptor :fd listenfd))
(when pipe
(epoll-add epoll (make-instance 'control :fd pipe)))
(loop
(when *stop*
(return))
(epoll:wait (events fd epoll-fd 10000 -1)
(let ((agent (get-agent epoll fd)))
(unless agent (error "bad epoll fd ~S" fd))
(unless (= 0 (logand epoll:+err+ events))
(agent-error epoll agent))
(unless (or (agent-pending agent)
(= 0 (logand epoll:+in+ events)))
(agent-in epoll agent))
(unless (or (agent-pending agent)
(= 0 (logand epoll:+out+ events)))
(agent-out epoll agent))))))))
(defun maybe-configure-epoll ()
(when (cffi:foreign-symbol-pointer "epoll_create")
(setf *acceptor-loop* #'acceptor-loop-epoll)))
(eval-when (:load-toplevel :execute)
(maybe-configure-epoll))
#+nil
(trace
epoll:create epoll-add epoll-del
acceptor-loop-epoll make-worker agent-in agent-out agent-error
stream-flush-output unistd:c-write
stream-output-index
)