Hash :
091716df
Author :
Thomas de Grivel
Date :
2017-06-28T02:35:48
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(in-package :thot)
(setf (debug-p :thot) nil)
(eval-when (:compile-toplevel :load-toplevel :execute)
(unless (boundp '+crlf+)
(defconstant +crlf+
(coerce '(#\Return #\Newline) 'string))))
;; Request
(defclass request ()
((stream :initarg :stream
:reader request-stream%
:type stream)
(method :initarg :method
:accessor request-method%
:type symbol)
(target :initarg :target
:accessor request-target%
:type string)
(http-version :initarg :http-version
:accessor request-http-version%
:type string)
(headers :initform (make-hash-table :test 'equalp :size 32)
:reader request-headers%
:type hash-table)
(uri :accessor request-uri%
:type string)
(query :initform nil
:accessor request-query%
:type string)))
(defvar *request*)
(defun request-stream (&optional (request *request*))
(declare (type request request))
(request-stream% request))
(defun request-method (&optional (request *request*))
(declare (type request request))
(request-method% request))
(defun request-target (&optional (request *request*))
(declare (type request request))
(request-target% request))
(defun request-http-version (&optional (request *request*))
(declare (type request request))
(request-http-version% request))
(defun request-headers (&optional (request *request*))
(declare (type request request))
(request-headers% request))
(defun split-request-uri-and-query (request)
(declare (type request request))
(let* ((target (request-target% request))
(target-? (position #\? target))
(uri (if target-?
(subseq target 0 target-?)
target))
(query (if target-?
(subseq target target-?)
nil)))
(setf (request-uri% request) uri
(request-query% request) query)))
(defun request-uri (&optional (request *request*))
(declare (type request request))
(unless (slot-boundp request 'uri)
(split-request-uri-and-query request))
(slot-value request 'uri))
(defun request-query (&optional (request *request*))
(declare (type request request))
(unless (slot-boundp request 'query)
(split-request-uri-and-query request))
(slot-value request 'query))
(defun request-header (header-name &optional (request *request*))
(declare (type request request))
(gethash header-name (request-headers% request)))
(defsetf request-header (header-name &optional (request '*request*)) (value)
`(setf (gethash ,header-name (request-headers ,request)) ,value))
(defun request-content-length (&optional (request *request*))
(parse-integer (request-header "Content-Length" request)))
;; HTTP parser
(defmacro with-readers-for (stream definitions &body body)
(declare (type symbol stream))
(flet ((reader (definition)
(destructuring-bind (name (element) &rest body) definition
(declare (type symbol name element))
(let ((state (gensym "STATE-")))
`(,name ()
(multiple-value-bind (,element ,state) (read ,stream)
(case ,state
((nil) ,@body)
((:eof) :eof)
((:non-blocking) #',name)
(otherwise (error 'stream-input-error
:stream ,stream)))))))))
`(labels ,(mapcar #'reader definitions)
,@body)))
(defun request-reader (request reply cont)
"Returns a HTTP request reader function which itself returns either :
:EOF if end of stream was reached, or
a closure if read would block, or
the return value of CONT, which should be either :
:KEEP-ALIVE if the connection is to be kept alive for next request, or
NIL if the request stream is to be closed after reply."
(let ((stream (request-stream request))
(buffer (string-output-stream))
(name "")
(value ""))
(flet ((get-buffer ()
(prog1 (string-output-stream-string buffer)
(sequence-output-stream-reset buffer))))
(with-readers-for stream
((method (char)
(cond ((char= #\Space char)
(setf (request-method% request) (get-buffer))
(target))
(t (write buffer char)
(method))))
(target (char)
(cond ((char= #\Space char)
(setf (request-target% request) (get-buffer))
(version))
(t (write buffer char)
(target))))
(version (char)
(cond ((char= #\Return char)
(setf (request-http-version% request) (get-buffer))
(version-lf))
(t (write buffer char)
(version))))
(version-lf (char)
(cond ((char= #\Newline char)
(when (debug-p (or :thot :http))
(format t "~&thot: ~A ~A ~A~%"
(request-method% request)
(request-target% request)
(request-http-version% request)))
(next-header))
(t (error "Missing request line LF"))))
(next-header (char)
(cond ((char= #\Return char) (end-of-headers))
(t (write buffer char)
(header-name))))
(header-name (char)
(cond ((char= #\: char)
(setq name (get-buffer))
(header-spaces))
(t (write buffer char)
(header-name))))
(header-spaces (char)
(cond ((char= #\Space char) (header-spaces))
(t (write buffer char)
(header-value))))
(header-value (char)
(cond ((char= #\Return char)
(setq value (get-buffer))
(header-lf))
(t (write buffer char)
(header-value))))
(header-lf (char)
(cond ((char= #\Newline char)
(when (debug-p (or :thot :http))
(format t "~&thot: ~A: ~A~%" name value))
(setf (request-header name request) value)
(next-header))
(t (error "Missing header LF"))))
(end-of-headers (char)
(cond ((char= #\Newline char) (funcall cont request reply))
(t (error "Missing end of headers LF")))))
#'method))))
;; Reply
(defclass reply ()
((status :initform nil
:accessor reply-status%)
(headers :initform nil
:accessor reply-headers%)
(headers-sent :initform nil
:accessor reply-headers-sent%
:type boolean)
(stream :initarg :stream
:accessor reply-stream%
:type buffered-output-stream)))
(defvar *reply*)
(defun reply-status (&optional (reply *reply*))
(declare (type reply reply))
(reply-status% reply))
(defsetf reply-status (&optional (reply '*reply*)) (value)
`(setf (reply-status% ,reply) ,value))
(defun reply-headers (&optional (reply *reply*))
(declare (type reply reply))
(reply-headers% reply))
(defsetf reply-headers (&optional (reply '*reply*)) (value)
`(setf (reply-headers% ,reply) ,value))
(defun reply-header (name &optional (reply *reply*)) (declare (type reply reply))
(let ((header (assoc name (reply-headers reply) :test #'string-equal)))
(when header
(rest header))))
(defun reply-headers-sent (&optional (reply *reply*))
(declare (type reply reply))
(reply-headers-sent% reply))
(defsetf reply-headers-sent (&optional (reply '*reply*)) (value)
`(setf (reply-headers-sent% ,reply) ,value))
(defun reply-stream (&optional (reply *reply*))
(declare (type reply reply))
(reply-stream% reply))
(defun reply-content-length (&optional (reply *reply*))
(declare (type reply reply))
(parse-integer (reply-header 'content-length reply)))
(defun status (line)
(let ((status (reply-status)))
(when status
(error 'status-already-sent status line)))
(setf (reply-status) line)
(let ((stream (reply-stream)))
(write-sequence stream (request-http-version))
(write stream #\Space)
(write-sequence stream line)
(write-sequence stream +crlf+)))
(defun header (line)
(unless (reply-status)
(status "200 OK"))
(let ((headers (reply-headers)))
(if (endp headers)
(setf (reply-headers) (list line))
(loop
(when (endp (rest headers))
(setf (rest headers) (list line))
(return))
(pop headers))))
(let ((stream (reply-stream)))
(write-sequence stream line)
(write-sequence stream +crlf+)))
(defun end-headers ()
(unless (reply-headers-sent)
(setf (reply-headers-sent) t)
(header "")))
(defun content (string)
(end-headers)
(write-sequence (reply-stream) string))
(defun 404-not-found ()
(status "404 Not found")
(header "Content-Type: text/plain")
(content (format nil "404 Not found
The requested url ~S was not found on this server."
(request-target))))
(defun 404-not-found-handler ()
'404-not-found)
(defvar *url-handlers*
'(404-not-found-handler))
(defun request-cont (request reply)
(let ((handlers *url-handlers*)
(*request* request)
(*reply* reply))
(handler-bind
((errno:errno-error (lambda (condition)
(cond ((= errno:+epipe+
(errno:errno-error-errno condition))
(return-from request-cont))))))
(loop
(when (endp handlers)
(return))
(let* ((handler-func (pop handlers))
(handler (funcall handler-func)))
(when handler
(when (debug-p (or :thot :http))
(format t "~&~S -> ~S~%" handler-func handler))
(funcall handler)
(flush (reply-stream% reply))
(return)))))
(if (string-equal "keep-alive" (request-header 'connection))
:keep-alive
nil)))
(defvar *stop* nil)
(defun request-loop (request-stream reply-stream)
(loop
(when *stop*
(return))
(let* ((request (make-instance 'request :stream request-stream))
(reply (make-instance 'reply :stream reply-stream))
(result (funcall (request-reader request reply #'request-cont))))
(unless (eq :keep-alive result)
(return)))))
(defvar *acceptor-loop*)
(defvar *host*)
(defvar *port*)
(defun start (&key (host "0.0.0.0") (port 8000))
(setq *stop* nil)
(let ((*host* host)
(*port* port))
(socket:with-socket (fd socket:+af-inet+
socket:+sock-stream+
0)
(socket:bind-inet fd host port)
(socket:listen fd 128)
(funcall (funcall *acceptor-loop* fd)))))
(defun set-nonblocking (fd)
(let ((flags (fcntl:getfl fd)))
(fcntl:setfl fd (logior fcntl:+o-nonblock+ flags))))