From: Rutger van Beusekom <rutger.van.beusekom@verum.com>
Date: Wed, 18 Nov 2020 15:12:28 +0000 (+0100)
Subject: websocket: Queue fragmented frames to avoid interleaving.
X-Git-Url: https://jxself.org/git/?a=commitdiff_plain;h=7eb9d00f81c26b1fbbc8edfcb8f5e1ff33ea4b1b;p=8sync.git

websocket: Queue fragmented frames to avoid interleaving.

* 8sync/systems/websocket/client.scm (<websocket>)[frames]: New slot.
(websocket-send): Use it to queue fragmented frames.

Acked-by: Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
---

diff --git a/8sync/systems/websocket/client.scm b/8sync/systems/websocket/client.scm
index 4986672..93fcdeb 100644
--- a/8sync/systems/websocket/client.scm
+++ b/8sync/systems/websocket/client.scm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2016 David Thompson <davet@gnu.org>
 ;;; Copyright © 2017 Christopher Allan Webber <cwebber@dustycloud.org>
 ;;; Copyright © 2019, 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;; Copyright © 2020 Rutger van Beusekom <rutger.van.beusekom@gmail.com>
 ;;;
 ;;; This file is part of guile-websocket.
 ;;;
@@ -71,6 +72,7 @@
   (url #:getter .url #:init-value #f #:init-keyword #:url)
   (uri #:accessor .uri #:init-value #f #:init-keyword #:uri)
   (entropy-port #:accessor .entropy-port #:init-form (open-entropy-port))
+  (frames #:accessor .frames #:init-value '())
 
   (on-close #:init-keyword #:on-close
                  #:init-value no-op
@@ -130,13 +132,18 @@
             (cons frame (loop end)))))))
 
 (define-method (websocket-send (websocket <websocket>) message data)
-  (catch #t           ; expect: wrong-type-arg (open port), system-error
+  (catch #t         ; expect: wrong-type-arg (open port), system-error
     (lambda _
-      (let* ((frames (make-fragmented-frames data)))
-        (let loop ((frames frames) (written '(nothing)))
-          (when (pair? frames)
-            (write-frame (car frames) (.socket websocket))
-            (loop (cdr frames) (cons (car frames) written))))))
+      (let* ((frames (make-fragmented-frames data))
+	     (frames? (pair? (.frames websocket))))
+	(set! (.frames websocket) (append (.frames websocket) frames))
+	(unless frames?
+	  (let loop ()
+	    (let ((frames (.frames websocket)))
+	      (when (pair? frames)
+		(write-frame (car frames) (.socket websocket))
+		(set! (.frames websocket) (cdr (.frames websocket)))
+		(loop)))))))
     (lambda (key . args)
       (unless (and (memq key '(system-error wrong-type-arg))
                    (match args