You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
670 lines
25 KiB
Scheme
670 lines
25 KiB
Scheme
(module websockets
|
|
(
|
|
; parameters
|
|
ping-interval close-timeout
|
|
connection-timeout accept-connection
|
|
drop-incoming-pings propagate-common-errors
|
|
max-frame-size max-message-size
|
|
|
|
; high level API
|
|
with-websocket with-concurrent-websocket
|
|
send-message receive-message
|
|
|
|
; low level API
|
|
;; send-frame read-frame read-frame-payload
|
|
;; receive-fragments valid-utf8?
|
|
;; control-frame? upgrade-to-websocket
|
|
;; current-websocket unmask close-websocket
|
|
;; process-fragments
|
|
|
|
;; ; fragment
|
|
;; make-fragment fragment? fragment-payload fragment-length
|
|
;; fragment-masked? fragment-masking-key fragment-last?
|
|
;; fragment-optype
|
|
)
|
|
|
|
(import chicken scheme data-structures extras ports posix foreign
|
|
srfi-13 srfi-14 srfi-18)
|
|
(use srfi-1 srfi-4 spiffy intarweb uri-common base64 simple-sha1
|
|
mailbox comparse)
|
|
|
|
(define-inline (neq? obj1 obj2) (not (eq? obj1 obj2)))
|
|
|
|
(define current-websocket (make-parameter #f))
|
|
(define ping-interval (make-parameter 15))
|
|
(define close-timeout (make-parameter 5))
|
|
(define connection-timeout (make-parameter 58)) ; a little grace period from 60s
|
|
(define accept-connection (make-parameter (lambda (origin) #t)))
|
|
(define drop-incoming-pings (make-parameter #t))
|
|
(define propagate-common-errors (make-parameter #f))
|
|
(define access-denied ; TODO test
|
|
(make-parameter (lambda () (send-status 'forbidden "<h1>Access denied</h1>"))))
|
|
|
|
(define max-frame-size (make-parameter 1048576)) ; 1MiB
|
|
(define max-message-size
|
|
(make-parameter 1048576 ; 1MiB
|
|
(lambda (v)
|
|
(if (> v 1073741823) ; max int size for unmask/utf8 check
|
|
(signal (make-property-condition 'out-of-range))
|
|
v))))
|
|
|
|
(define (make-websocket-exception . conditions)
|
|
(apply make-composite-condition (append `(,(make-property-condition 'websocket))
|
|
conditions)))
|
|
|
|
(define (make-protocol-violation-exception msg)
|
|
(make-composite-condition (make-property-condition 'websocket)
|
|
(make-property-condition 'protocol-error 'msg msg)))
|
|
|
|
(define (opcode->optype op)
|
|
(case op
|
|
((0) 'continuation)
|
|
((1) 'text)
|
|
((2) 'binary)
|
|
((8) 'connection-close)
|
|
((9) 'ping)
|
|
((10) 'pong)
|
|
(else (signal (make-protocol-violation-exception "bad opcode")))))
|
|
|
|
(define (optype->opcode t)
|
|
(case t
|
|
('continuation 0)
|
|
('text 1)
|
|
('binary 2)
|
|
('connection-close 8)
|
|
('ping 9)
|
|
('pong 10)
|
|
(else (signal (make-websocket-exception
|
|
(make-property-condition 'invalid-optype))))))
|
|
|
|
(define (control-frame? optype)
|
|
(or (eq? optype 'ping) (eq? optype 'pong) (eq? optype 'connection-close)))
|
|
|
|
(define-record-type websocket
|
|
(make-websocket inbound-port outbound-port user-thread
|
|
send-mutex read-mutex last-message-timestamp
|
|
state send-mailbox read-mailbox concurrent)
|
|
websocket?
|
|
(inbound-port websocket-inbound-port)
|
|
(outbound-port websocket-outbound-port)
|
|
(user-thread websocket-user-thread)
|
|
(send-mutex websocket-send-mutex)
|
|
(read-mutex websocket-read-mutex)
|
|
(last-message-timestamp websocket-last-message-timestamp
|
|
set-websocket-last-message-timestamp!)
|
|
(state websocket-state set-websocket-state!)
|
|
(send-mailbox websocket-send-mailbox)
|
|
(read-mailbox websocket-read-mailbox)
|
|
(concurrent websocket-concurrent?))
|
|
|
|
(define-record-type websocket-fragment
|
|
(make-fragment payload length masked masking-key
|
|
fin optype)
|
|
fragment?
|
|
(payload fragment-payload)
|
|
(length fragment-length)
|
|
(masked fragment-masked? set-fragment-masked!)
|
|
(masking-key fragment-masking-key)
|
|
(fin fragment-last?)
|
|
(optype fragment-optype))
|
|
|
|
(define (hex-string->string hexstr)
|
|
;; convert a string like "a745ff12" to a string
|
|
(let ((result (make-string (/ (string-length hexstr) 2))))
|
|
(let loop ((hexs (string->list hexstr))
|
|
(i 0))
|
|
(if (< (length hexs) 2)
|
|
result
|
|
(let ((ascii (string->number (string (car hexs) (cadr hexs)) 16)))
|
|
(string-set! result i (integer->char ascii))
|
|
(loop (cddr hexs)
|
|
(+ i 1)))))))
|
|
|
|
|
|
(define (send-frame ws optype data last-frame)
|
|
; TODO this sucks
|
|
(when (u8vector? data) (set! data (blob->string (u8vector->blob/shared data))))
|
|
(let* ((len (if (string? data) (string-length data) (u8vector-length data)))
|
|
(frame-fin (if last-frame 1 0))
|
|
(frame-rsv1 0)
|
|
(frame-rsv2 0)
|
|
(frame-rsv3 0)
|
|
(frame-opcode (optype->opcode optype))
|
|
(octet0 (bitwise-ior (arithmetic-shift frame-fin 7)
|
|
(arithmetic-shift frame-rsv1 6)
|
|
(arithmetic-shift frame-rsv2 5)
|
|
(arithmetic-shift frame-rsv3 4)
|
|
frame-opcode))
|
|
|
|
(frame-masked 0)
|
|
(frame-payload-length (cond ((< len 126) len)
|
|
((< len 65536) 126)
|
|
(else 127)))
|
|
(octet1 (bitwise-ior (arithmetic-shift frame-masked 7)
|
|
frame-payload-length))
|
|
(outbound-port (websocket-outbound-port ws)))
|
|
|
|
(write-u8vector (u8vector octet0 octet1) outbound-port)
|
|
|
|
(write-u8vector
|
|
(cond
|
|
((= frame-payload-length 126)
|
|
(u8vector
|
|
(arithmetic-shift (bitwise-and len 65280) -8)
|
|
(bitwise-and len 255)))
|
|
((= frame-payload-length 127)
|
|
(u8vector
|
|
0 0 0 0
|
|
(arithmetic-shift
|
|
(bitwise-and len 4278190080) -24)
|
|
(arithmetic-shift
|
|
(bitwise-and len 16711680) -16)
|
|
(arithmetic-shift
|
|
(bitwise-and len 65280) -8)
|
|
(bitwise-and len 255)))
|
|
(else (u8vector)))
|
|
outbound-port)
|
|
|
|
(write-string data len outbound-port)
|
|
#t))
|
|
|
|
(define (send-message data #!optional (optype 'text) (ws (current-websocket)))
|
|
;; TODO break up large data into multiple frames?
|
|
(optype->opcode optype) ; triggers error if invalid
|
|
(dynamic-wind
|
|
(lambda () (mutex-lock! (websocket-send-mutex ws)))
|
|
(lambda () (send-frame ws optype data #t))
|
|
(lambda () (mutex-unlock! (websocket-send-mutex ws)))))
|
|
|
|
(define (websocket-unmask-frame-payload payload len frame-masking-key)
|
|
(define tmaskkey (make-u8vector 4 #f #t #t))
|
|
(u8vector-set! tmaskkey 0 (vector-ref frame-masking-key 0))
|
|
(u8vector-set! tmaskkey 1 (vector-ref frame-masking-key 1))
|
|
(u8vector-set! tmaskkey 2 (vector-ref frame-masking-key 2))
|
|
(u8vector-set! tmaskkey 3 (vector-ref frame-masking-key 3))
|
|
(define-external wsmaskkey blob (u8vector->blob/shared tmaskkey))
|
|
|
|
(define-external wslen int len)
|
|
|
|
; TODO handle -1
|
|
|
|
(define-external wsv scheme-pointer payload)
|
|
((foreign-lambda* void ()
|
|
"
|
|
if (wslen > UINT_MAX) { return -1; }
|
|
|
|
const unsigned char* maskkey2 = wsmaskkey;
|
|
const unsigned int kd = *(unsigned int*)maskkey2;
|
|
const unsigned char* __restrict kb = maskkey2;
|
|
|
|
|
|
int i;
|
|
for (i = wslen >> 2; i != 0; --i)
|
|
{
|
|
*((unsigned int*)wsv) ^= kd;
|
|
wsv += 4;
|
|
}
|
|
|
|
const int rem = wslen & 3;
|
|
for (i = 0; i < rem; ++i)
|
|
{
|
|
*((unsigned int*)wsv++) ^= kb[i];
|
|
}
|
|
"
|
|
))
|
|
payload)
|
|
|
|
(define (unmask fragment)
|
|
(if (fragment-masked? fragment)
|
|
(let ((r (websocket-unmask-frame-payload
|
|
(fragment-payload fragment)
|
|
(fragment-length fragment)
|
|
(fragment-masking-key fragment))))
|
|
(set-fragment-masked! fragment #f)
|
|
r)
|
|
(fragment-payload fragment)))
|
|
|
|
(define (read-frame-payload inbound-port frame-payload-length)
|
|
(let ((masked-data (make-string frame-payload-length)))
|
|
(read-string! frame-payload-length masked-data inbound-port)
|
|
masked-data)
|
|
;; (let* ((masked-data (make-string frame-payload-length)))
|
|
;; (read-string! frame-payload-length masked-data inbound-port)
|
|
|
|
;; (define tmaskkey (make-u8vector 4 #f #t #t))
|
|
;; (u8vector-set! tmaskkey 0 (vector-ref frame-masking-key 0))
|
|
;; (u8vector-set! tmaskkey 1 (vector-ref frame-masking-key 1))
|
|
;; (u8vector-set! tmaskkey 2 (vector-ref frame-masking-key 2))
|
|
;; (u8vector-set! tmaskkey 3 (vector-ref frame-masking-key 3))
|
|
;; (define-external wsmaskkey blob (u8vector->blob/shared tmaskkey))
|
|
|
|
;; (define-external wslen int frame-payload-length)
|
|
|
|
;; (define-external wsv scheme-pointer masked-data)
|
|
|
|
;; (if frame-masked
|
|
;; (begin
|
|
;; ((foreign-lambda* void ()
|
|
;; "
|
|
;; const unsigned char* maskkey2 = wsmaskkey;
|
|
;; const unsigned int kd = *(unsigned int*)maskkey2;
|
|
;; const unsigned char* __restrict kb = maskkey2;
|
|
|
|
|
|
;; for (int i = wslen >> 2; i != 0; --i)
|
|
;; {
|
|
;; *((unsigned int*)wsv) ^= kd;
|
|
;; wsv += 4;
|
|
;; }
|
|
|
|
;; const int rem = wslen & 3;
|
|
;; for (int i = 0; i < rem; ++i)
|
|
;; {
|
|
;; *((unsigned int*)wsv++) ^= kb[i];
|
|
;; }
|
|
;; "
|
|
;; ))
|
|
;; masked-data)
|
|
;; masked-data))
|
|
)
|
|
|
|
(define (read-frame total-size ws)
|
|
(let* ((inbound-port (websocket-inbound-port ws))
|
|
(b0 (read-byte inbound-port)))
|
|
; we don't support reserved bits yet
|
|
(when (or (> (bitwise-and b0 64) 0)
|
|
(> (bitwise-and b0 32) 0)
|
|
(> (bitwise-and b0 16) 0))
|
|
(signal (make-websocket-exception
|
|
(make-property-condition 'reserved-bits-not-supported)
|
|
(make-property-condition 'protocol-error))))
|
|
(cond
|
|
((eof-object? b0) b0)
|
|
(else
|
|
(let* ((frame-fin (> (bitwise-and b0 128) 0))
|
|
(frame-opcode (bitwise-and b0 15))
|
|
(frame-optype (opcode->optype frame-opcode))
|
|
;; second byte
|
|
(b1 (read-byte inbound-port))
|
|
; TODO die on unmasked frame?
|
|
(frame-masked (> (bitwise-and b1 128) 0))
|
|
(frame-payload-length (bitwise-and b1 127)))
|
|
(cond ((= frame-payload-length 126)
|
|
(let ((bl0 (read-byte inbound-port))
|
|
(bl1 (read-byte inbound-port)))
|
|
(set! frame-payload-length (+ (arithmetic-shift bl0 8) bl1))))
|
|
((= frame-payload-length 127)
|
|
(define (shift i r)
|
|
(if (< i 0)
|
|
r
|
|
(shift (- i 1) (+ (arithmetic-shift (read-byte inbound-port) (* 8 i))
|
|
r))))
|
|
(set! frame-payload-length (shift 7 0))))
|
|
(when (or (> frame-payload-length (max-frame-size))
|
|
(> (+ frame-payload-length total-size) (max-message-size)))
|
|
(signal (make-websocket-exception
|
|
(make-property-condition 'message-too-large))))
|
|
(let* ((frame-masking-key
|
|
(if frame-masked
|
|
(let* ((fm0 (read-byte inbound-port))
|
|
(fm1 (read-byte inbound-port))
|
|
(fm2 (read-byte inbound-port))
|
|
(fm3 (read-byte inbound-port)))
|
|
(vector fm0 fm1 fm2 fm3))
|
|
#f)))
|
|
(cond
|
|
((or (eq? frame-optype 'text) (eq? frame-optype 'binary)
|
|
(eq? frame-optype 'continuation) (eq? frame-optype 'ping)
|
|
(eq? frame-optype 'pong))
|
|
(make-fragment
|
|
(read-frame-payload inbound-port frame-payload-length)
|
|
frame-payload-length frame-masked
|
|
frame-masking-key frame-fin frame-optype))
|
|
((eq? frame-optype 'connection-close) ; TODO, same as above?
|
|
(make-fragment
|
|
(read-frame-payload inbound-port frame-payload-length)
|
|
frame-payload-length frame-masked frame-masking-key
|
|
frame-fin frame-optype))
|
|
(else
|
|
(signal (make-websocket-exception
|
|
(make-property-condition 'unhandled-optype
|
|
'optype frame-optype)))))))))))
|
|
|
|
(include "utf8-grammar.scm")
|
|
|
|
(define (valid-utf8? s)
|
|
(or (let ((len (string-length s)))
|
|
; Try to validate as an ascii string first. Its essentially
|
|
; free, doesn't generate garbage and is many, many times
|
|
; faster than the general purpose validator.
|
|
(define-external ws_utlen int len)
|
|
(define-external ws_uts scheme-pointer s)
|
|
(= 1
|
|
((foreign-lambda* int ()
|
|
"
|
|
if (ws_utlen > UINT_MAX) { return -1; }
|
|
|
|
int i;
|
|
for (i = ws_utlen; i != 0; --i)
|
|
{
|
|
if (*((unsigned char*)ws_uts++) > 127)
|
|
{
|
|
C_return(0);
|
|
}
|
|
}
|
|
|
|
C_return(1);
|
|
"))))
|
|
(parse utf8-string (->parser-input s))))
|
|
|
|
(define (close-code->integer s)
|
|
(if (string-null? s)
|
|
1000
|
|
(+ (arithmetic-shift (char->integer (string-ref s 0)) 8)
|
|
(char->integer (string-ref s 1)))))
|
|
|
|
(define (close-code-string->close-reason s)
|
|
(let ((c (close-code->integer s)))
|
|
(case c
|
|
((1000) 'normal)
|
|
((1001) 'going-away)
|
|
((1002) 'protocol-error)
|
|
((1003) 'unknown-data-type)
|
|
((1007) 'invalid-data)
|
|
((1008) 'violated-policy)
|
|
((1009) 'message-too-large)
|
|
((1010) 'extension-negotiation-failed)
|
|
((1011) 'unexpected-error)
|
|
(else
|
|
(if (and (>= c 3000) (< c 5000))
|
|
'unknown
|
|
'invalid-close-code)))))
|
|
|
|
(define (valid-close-code? s)
|
|
(neq? 'invalid-close-code (close-code-string->close-reason s)))
|
|
|
|
(define (receive-fragments #!optional (ws (current-websocket)))
|
|
(dynamic-wind
|
|
(lambda () (mutex-lock! (websocket-read-mutex ws)))
|
|
(lambda ()
|
|
(if (or (eq? (websocket-state ws) 'closing)
|
|
(eq? (websocket-state ws) 'closed)
|
|
(eq? (websocket-state ws) 'error))
|
|
(values #!eof #!eof)
|
|
(let loop ((fragments '())
|
|
(first #t)
|
|
(type 'text)
|
|
(total-size 0))
|
|
(let* ((fragment (read-frame total-size ws))
|
|
(optype (fragment-optype fragment))
|
|
(len (fragment-length fragment))
|
|
(last-frame (fragment-last? fragment)))
|
|
(set-websocket-last-message-timestamp! ws (current-time))
|
|
(cond
|
|
((and (control-frame? optype) (> len 125))
|
|
(set-websocket-state! ws 'error)
|
|
(signal (make-protocol-violation-exception
|
|
"control frame bodies must be less than 126 octets")))
|
|
|
|
; connection close
|
|
((and (eq? optype 'connection-close) (= len 1))
|
|
(set-websocket-state! ws 'error)
|
|
(signal (make-protocol-violation-exception
|
|
"close frames must not have a length of 1")))
|
|
((and (eq? optype 'connection-close)
|
|
(not (valid-close-code? (unmask fragment))))
|
|
(set-websocket-state! ws 'error)
|
|
(signal (make-protocol-violation-exception
|
|
(string-append
|
|
"invalid close code "
|
|
(number->string (close-code->integer (unmask fragment)))))))
|
|
((eq? optype 'connection-close)
|
|
(set-websocket-state! ws 'closing)
|
|
(values `(,fragment) optype))
|
|
|
|
; immediate response
|
|
((and (eq? optype 'ping) last-frame (<= len 125))
|
|
(unless (drop-incoming-pings)
|
|
(send-message (unmask fragment) 'pong))
|
|
(loop fragments first type total-size))
|
|
|
|
; protocol violation checks
|
|
((or (and first (eq? optype 'continuation))
|
|
(and (not first) (neq? optype 'continuation)))
|
|
(set-websocket-state! ws 'error)
|
|
(signal (make-protocol-violation-exception
|
|
"continuation frame out-of-order")))
|
|
((and (not last-frame) (control-frame? optype))
|
|
(set-websocket-state! ws 'error)
|
|
(signal (make-protocol-violation-exception
|
|
"control frames can't be fragmented")))
|
|
|
|
((eq? optype 'pong)
|
|
(loop fragments first type total-size))
|
|
|
|
(else
|
|
(if last-frame
|
|
(values (cons fragment fragments) (if (null? fragments) optype type))
|
|
(loop (cons fragment fragments) #f
|
|
(if first optype type)
|
|
(+ total-size len)))))))))
|
|
(lambda () (mutex-unlock! (websocket-read-mutex ws)))))
|
|
|
|
(define (process-fragments fragments optype #!optional (ws (current-websocket)))
|
|
(let ((message-body (string-concatenate/shared
|
|
(reverse (map unmask fragments)))))
|
|
(when (and (or (eq? optype 'text) (eq? optype 'connection-close))
|
|
(not (valid-utf8?
|
|
(if (eq? optype 'text)
|
|
message-body
|
|
(if (> (string-length message-body) 2)
|
|
(substring message-body 2)
|
|
"")))))
|
|
(set-websocket-state! ws 'error)
|
|
(signal (make-websocket-exception
|
|
(make-property-condition
|
|
'invalid-data 'msg "invalid UTF-8"))))
|
|
(values message-body optype)))
|
|
|
|
(define (receive-message #!optional (ws (current-websocket)))
|
|
(if (websocket-concurrent? ws)
|
|
(let ((msg (mailbox-receive! (websocket-read-mailbox ws))))
|
|
(values (car msg) (cdr msg)))
|
|
(receive (fragments optype) (receive-fragments ws)
|
|
(if (eof-object? fragments)
|
|
(values #!eof optype)
|
|
(process-fragments fragments optype)))))
|
|
|
|
; TODO does #!optional and #!key work together?
|
|
(define (close-websocket #!optional (ws (current-websocket))
|
|
#!key (close-reason 'normal) (data (make-u8vector 0)))
|
|
(define invalid-close-reason #f)
|
|
(define (close-reason->close-code reason)
|
|
(case reason
|
|
('normal 1000)
|
|
('going-away 1001)
|
|
('protocol-error 1002)
|
|
('unknown-data-type 1003)
|
|
('invalid-data 1007)
|
|
('violated-policy 1008)
|
|
('message-too-large 1009)
|
|
('unexpected-error 1011)
|
|
(else (set! invalid-close-reason reason)
|
|
(close-reason->close-code 'unexpected-error))))
|
|
|
|
; Use thread timeout to handle the close-timeout
|
|
(let ((close-thread
|
|
(make-thread
|
|
(lambda ()
|
|
(if (eq? (websocket-state ws) 'open)
|
|
(begin
|
|
(set-websocket-state! ws 'closed)
|
|
(send-frame ws 'connection-close
|
|
(u8vector 3 (close-reason->close-code close-reason))
|
|
#t)
|
|
(let loop ()
|
|
(receive (data type) (receive-message ws)
|
|
(if (eq? type 'connection-close)
|
|
(unless (valid-utf8? data)
|
|
(set! close-reason 'invalid-data))
|
|
(loop)))))
|
|
(begin
|
|
(send-frame ws 'connection-close
|
|
(u8vector 3 (close-reason->close-code close-reason))
|
|
#t))))
|
|
"close timeout thread")))
|
|
(thread-start! close-thread)
|
|
(if (> (close-timeout) 0)
|
|
(unless (thread-join! close-thread (close-timeout) #f)
|
|
; TODO actually signal error?
|
|
;; (thread-signal! (websocket-user-thread (current-websocket))
|
|
;; (make-websocket-exception
|
|
;; (make-property-condition 'close-timeout)))
|
|
)
|
|
(thread-join! close-thread))))
|
|
|
|
|
|
(define (sha1-sum in-bv)
|
|
(hex-string->string (string->sha1sum in-bv)))
|
|
|
|
(define (websocket-compute-handshake client-key)
|
|
(let* ((key-and-magic
|
|
(string-append client-key "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"))
|
|
(key-and-magic-sha1 (sha1-sum key-and-magic)))
|
|
(base64-encode key-and-magic-sha1)))
|
|
|
|
(define (sec-websocket-accept-unparser header-contents)
|
|
(map (lambda (header-content)
|
|
(car (vector-ref header-content 0)))
|
|
header-contents))
|
|
|
|
(header-unparsers
|
|
(alist-update! 'sec-websocket-accept
|
|
sec-websocket-accept-unparser
|
|
(header-unparsers)))
|
|
|
|
(define (websocket-accept #!optional (concurrent #f))
|
|
(let* ((user-thread (current-thread))
|
|
(headers (request-headers (current-request)))
|
|
(client-key (header-value 'sec-websocket-key headers))
|
|
(ws-handshake (websocket-compute-handshake client-key))
|
|
(ws (make-websocket
|
|
(request-port (current-request))
|
|
(response-port (current-response))
|
|
user-thread
|
|
(make-mutex "send")
|
|
(make-mutex "read")
|
|
(current-time)
|
|
'open ; websocket state
|
|
(make-mailbox "send")
|
|
(make-mailbox "read")
|
|
concurrent))
|
|
(ping-thread
|
|
(make-thread
|
|
(lambda ()
|
|
(let loop ()
|
|
(thread-sleep! (ping-interval))
|
|
(when (eq? (websocket-state ws) 'open)
|
|
(send-message "" 'ping ws)
|
|
(loop))))
|
|
"ping thread")))
|
|
|
|
; make sure the request meets the spec for websockets
|
|
(cond ((not (and (member 'upgrade (header-values 'connection headers))
|
|
(string-ci= (car (header-value 'upgrade headers '(""))) "websocket")))
|
|
(signal (make-websocket-exception
|
|
(make-property-condition 'missing-upgrade-header))))
|
|
((not (string= (header-value 'sec-websocket-version headers "") "13"))
|
|
(with-headers ; TODO test
|
|
`((sec-websocket-version "13"))
|
|
(lambda () (send-status 'upgrade-required))))
|
|
((not ((accept-connection) (header-value 'origin headers "")))
|
|
((access-denied))))
|
|
|
|
(with-headers
|
|
`((upgrade ("WebSocket" . #f))
|
|
(connection (upgrade . #t))
|
|
(sec-websocket-accept (,ws-handshake . #t)))
|
|
(lambda ()
|
|
(send-response status: 'switching-protocols)))
|
|
(flush-output (response-port (current-response)))
|
|
|
|
; connection timeout thread
|
|
(when (> (connection-timeout) 0)
|
|
(thread-start!
|
|
(lambda ()
|
|
(let loop ()
|
|
(let ((t (websocket-last-message-timestamp ws)))
|
|
; Add one to attempt to alleviate checking the timestamp
|
|
; right before when the timeout should happen.
|
|
(thread-sleep! (+ 1 (connection-timeout)))
|
|
(when (eq? (websocket-state ws) 'open)
|
|
(if (< (- (time->seconds (current-time))
|
|
(time->seconds (websocket-last-message-timestamp ws)))
|
|
(connection-timeout))
|
|
(loop)
|
|
(begin (thread-signal!
|
|
(websocket-user-thread ws)
|
|
(make-websocket-exception
|
|
(make-property-condition 'connection-timeout)))
|
|
(close-websocket ws close-reason: 'going-away)))))))))
|
|
|
|
(when (> (ping-interval) 0)
|
|
(thread-start! ping-thread))
|
|
|
|
ws))
|
|
|
|
(define (with-websocket proc #!optional (concurrent #f))
|
|
(define (handle-error close-reason exn)
|
|
(set-websocket-state! (current-websocket) 'closing)
|
|
(close-websocket (current-websocket) close-reason: close-reason)
|
|
(unless (port-closed? (request-port (current-request)))
|
|
(close-input-port (request-port (current-request))))
|
|
(unless (port-closed? (response-port (current-response)))
|
|
(close-output-port (response-port (current-response))))
|
|
(when (propagate-common-errors)
|
|
(signal exn)))
|
|
(parameterize
|
|
((current-websocket (websocket-accept concurrent)))
|
|
(condition-case
|
|
(begin (proc)
|
|
(close-websocket)
|
|
(close-input-port (request-port (current-request)))
|
|
(close-output-port (response-port (current-response))))
|
|
(exn (websocket protocol-error) (handle-error 'protocol-error exn))
|
|
(exn (websocket invalid-data) (handle-error 'invalid-data exn))
|
|
(exn (websocket connection-timeout) (handle-error 'going-away exn))
|
|
(exn (websocket message-too-large) (handle-error 'message-too-large exn))
|
|
(exn () (handle-error 'unexpected-error exn)))))
|
|
|
|
(define (with-concurrent-websocket proc)
|
|
(let ((parent-thread (current-thread)))
|
|
(with-websocket
|
|
(lambda ()
|
|
(thread-start!
|
|
(lambda ()
|
|
(handle-exceptions
|
|
exn
|
|
(thread-signal! parent-thread exn)
|
|
(let loop ()
|
|
(receive (fragments optype) (receive-fragments)
|
|
(unless (eof-object? fragments)
|
|
(thread-start!
|
|
(lambda ()
|
|
(handle-exceptions
|
|
exn
|
|
(thread-signal! parent-thread exn)
|
|
(mailbox-send!
|
|
(websocket-read-mailbox (current-websocket))
|
|
(receive (msg-body optype)
|
|
(process-fragments fragments optype)
|
|
`(,msg-body . ,optype))))))
|
|
(loop)))))))
|
|
(proc))
|
|
#t)))
|
|
|
|
(define (upgrade-to-websocket #!optional (concurrent #f))
|
|
(websocket-accept concurrent))
|
|
|
|
)
|