From ab7d0294d28fa686226e714a606c102e1f265a41 Mon Sep 17 00:00:00 2001
From: "Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>
Date: Mon, 22 Apr 2019 19:03:37 +0200
Subject: [PATCH] websocket: Initial <websocket> client actor support.

* 8sync/systems/websocket/client.scm (no-op): New procedure.
(<websocket>): Change from record to actor and use it.
(websocket-init): New method.
(set-nonblocking!): New procedure.
(make-client-socket): Use it.
(make-websocket): Rename to...
(websocket-open): ...this new method and change accordingly.
(close-websocket): Rename to ...
(websocket-close): ...this new method and change accordingly.
(handshake, websocket-send, websocket-connecting, websocket-open?,
websocket-closing?, websocket-closed?): Change to method and update
accordingly.
(display-websocket): Move to...
(write)[<websocket]: ...this new specialization.
(set-record-type-printer!): Remove.
(websocket-loop): Renamed from...
* 8sync/systems/websocket/server.scm (websocket-client-loop): ...here.
(make-websocket-actor): New procedure.
(<websocket-server>): Call it for websocket upgrade, create new
<websocket> actor.
* demos/websocket/8s-client.scm,
demos/websocket/8s-server.scm,
demos/websocket/ws-client.js,
demos/websocket/ws-server.js: New files.
* Makefile.am (EXTRA_DIST): Add them.
---
 8sync/systems/websocket/client.scm | 289 +++++++++++++++++++----------
 8sync/systems/websocket/server.scm | 157 ++++------------
 Makefile.am                        |   6 +-
 demos/websocket/8s-client.scm      |  61 ++++++
 demos/websocket/8s-server.scm      |  76 ++++++++
 demos/websocket/node-client.js     |  26 +++
 demos/websocket/ws-client.html     |  43 +++++
 demos/websocket/ws-client.js       |  44 +++++
 demos/websocket/ws-server.js       |  48 +++++
 9 files changed, 536 insertions(+), 214 deletions(-)
 create mode 100755 demos/websocket/8s-client.scm
 create mode 100755 demos/websocket/8s-server.scm
 create mode 100644 demos/websocket/node-client.js
 create mode 100644 demos/websocket/ws-client.html
 create mode 100755 demos/websocket/ws-client.js
 create mode 100755 demos/websocket/ws-server.js

diff --git a/8sync/systems/websocket/client.scm b/8sync/systems/websocket/client.scm
index 86f82ef..11702f7 100644
--- a/8sync/systems/websocket/client.scm
+++ b/8sync/systems/websocket/client.scm
@@ -1,5 +1,7 @@
 ;;; guile-websocket --- WebSocket client/server
 ;;; Copyright © 2016 David Thompson <davet@gnu.org>
+;;; Copyright © 2017 Christopher Allan Webber <cwebber@dustycloud.org>
+;;; Copyright © 2019, 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of guile-websocket.
 ;;;
@@ -25,27 +27,161 @@
 
 (define-module (8sync systems websocket client)
   #:use-module (ice-9 match)
+  #:use-module (srfi srfi-26)
   #:use-module (rnrs bytevectors)
   #:use-module (rnrs io ports)
-  #:use-module (srfi srfi-9)
-  #:use-module (srfi srfi-9 gnu)
   #:use-module (web request)
   #:use-module (web response)
   #:use-module (web uri)
+  #:use-module (oop goops)
+  #:use-module (8sync)
+  #:use-module (8sync ports)
   #:use-module (8sync contrib base64)
   #:use-module (8sync systems websocket frame)
   #:use-module (8sync systems websocket utils)
-  #:export (make-websocket
-            websocket?
-            websocket-uri
-            websocket-state
+  #:export (<websocket>
+            .on-close
+            .on-error
+            .on-message
+            .on-open
+            .socket
+            .state
+            .url
+
+            websocket-closed?
+            websocket-closing?
+            websocket-connect
             websocket-connecting?
             websocket-open?
-            websocket-closing?
-            websocket-closed?
-            close-websocket
-            websocket-send
-            websocket-receive))
+
+            websocket-close
+            websocket-loop
+            websocket-send))
+
+(define no-op (const #f))
+
+(define-actor <websocket> (<actor>)
+  ((*init* websocket-init)
+   (close websocket-close)
+   (open websocket-open)
+   (send websocket-send))
+
+  (state #:accessor .state #:init-value 'closed #:init-keyword #:state)
+  (socket #:accessor .socket #:init-value #f #:init-keyword #:socket)
+  (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))
+
+  (on-close #:init-keyword #:on-close
+                 #:init-value no-op
+                 #:accessor .on-close)
+  (on-error #:init-keyword #:on-error
+            #:init-value no-op
+            #:accessor .on-error)
+  (on-message #:init-keyword #:on-message
+              #:accessor .on-message)
+  (on-open #:init-keyword #:on-open
+                #:init-value no-op
+                #:accessor .on-open))
+
+(define-method (websocket-close (websocket <websocket>) message)
+  (when (websocket-open? websocket)
+    (false-if-exception (close-port (.socket websocket)))
+    (set! (.state websocket) 'closed)
+    (false-if-exception ((.on-close websocket) websocket))
+    (set! (.socket websocket) #f)))
+
+(define-method (websocket-open (websocket <websocket>) message uri-or-string)
+  (if (websocket-closed? websocket)
+      (let ((uri (match uri-or-string
+                   ((? uri? uri) uri)
+                   ((? string? str) (string->uri str)))))
+        (if (websocket-uri? uri)
+            (catch 'system-error
+              (lambda _
+                (set! (.uri websocket) uri)
+                (let ((sock (make-client-socket uri)))
+                  (set! (.socket websocket) sock)
+                  (handshake websocket)
+                  (websocket-loop websocket message)))
+              (lambda (key . args)
+                ((.on-error websocket) websocket (format #f "open failed: ~s: ~s" uri-or-string args))))
+            ((.on-error websocket) websocket (format #f "not a websocket uri: ~s" uri-or-string))))
+      ((.on-error websocket) websocket (format #f "cannot open websocket in state: ~s" (.state websocket)))))
+
+(define-method (websocket-send (websocket <websocket>) message data)
+  (catch #t           ; expect: wrong-type-arg (open port), system-error
+    (lambda _
+      (write-frame
+       (cond ((string? data)
+              (make-text-frame data))
+             ((bytevector? data)
+              (make-binary-frame data)))
+       (.socket websocket)))
+    (lambda (key . args)
+      (let ((message (format #f "~a: ~s" key args)))
+        ((.on-error websocket) websocket (format #f "send failed: ~s ~a\n" websocket message))
+        (websocket-close websocket message)))))
+
+(define-method (websocket-init (websocket <websocket>) message)
+  (and=> (.url websocket) (cut websocket-open websocket message <>)))
+
+(define-method (websocket-loop (websocket <websocket>) message)
+
+  (define (handle-data-frame type data)
+    ((.on-message websocket)
+     websocket
+     (match type
+       ('text   (utf8->string data))
+       ('binary data))))
+
+  (define (read-frame-maybe)
+    (and (not (eof-object? (lookahead-u8 (.socket websocket))))
+         (read-frame (.socket websocket))))
+
+  (define (close-down)
+    (websocket-close websocket message))
+
+  ((.on-open websocket) websocket)
+
+  (let loop ((fragments '())
+             (type #f))
+    (let* ((socket (.socket websocket))
+           (frame (and (websocket-open? websocket)
+                       (read-frame-maybe))))
+      (cond
+       ;; EOF - port is closed.
+       ;; @@: Sometimes the eof object appears here as opposed to
+       ;;   at lookahead, but I'm not sure why
+       ((or (not frame) (eof-object? frame))
+        (close-down))
+       ;; Per section 5.4, control frames may appear interspersed
+       ;; along with a fragmented message.
+       ((close-frame? frame)
+        ;; Per section 5.5.1, echo the close frame back to the
+        ;; socket before closing the socket.  The socket may no
+        ;; longer be listening.
+        (false-if-exception
+         (write-frame (make-close-frame (frame-data frame)) socket))
+        (close-down))
+       ((ping-frame? frame)
+        ;; Per section 5.5.3, a pong frame must include the exact
+        ;; same data as the ping frame.
+        (write-frame (make-pong-frame (frame-data frame)) socket)
+        (loop fragments type))
+       ((pong-frame? frame)           ; silently ignore pongs
+        (loop fragments type))
+       ((first-fragment-frame? frame) ; begin accumulating fragments
+        (loop (list frame) (frame-type frame)))
+       ((final-fragment-frame? frame) ; concatenate all fragments
+        (handle-data-frame type (frame-concatenate
+                                 (reverse (cons frame fragments))))
+        (loop '() #f))
+       ((fragment-frame? frame)       ; add a fragment
+        (loop (cons frame fragments) type))
+       ((data-frame? frame)           ; unfragmented data frame
+        (handle-data-frame (frame-type frame) (frame-data frame))
+        (loop '() #f))))))
 
 ;; See Section 3 - WebSocket URIs
 (define (encrypted-websocket-scheme? uri)
@@ -64,6 +200,10 @@ scheme."
            (unencrypted-websocket-scheme? uri))
        (not (uri-fragment uri))))
 
+(define (set-nonblocking! port)
+  (fcntl port F_SETFL (logior O_NONBLOCK (fcntl port F_GETFL)))
+  (setvbuf port 'block 1024))
+
 (define (make-client-socket uri)
   "Connect a socket to the remote resource described by URI."
   (let* ((port (uri-port uri))
@@ -74,48 +214,43 @@ scheme."
                                  (if port
                                      AI_NUMERICSERV
                                      0))))
-         (s (with-fluids ((%default-port-encoding #f))
-              (socket (addrinfo:fam info) SOCK_STREAM IPPROTO_IP))))
-    ;; TODO: Configure I/O buffering?
-    (connect s (addrinfo:addr info))
-    s))
+         (sock (with-fluids ((%default-port-encoding #f))
+                 (socket (addrinfo:fam info) SOCK_STREAM IPPROTO_IP))))
 
-(define-record-type <websocket>
-  (%make-websocket uri socket entropy-port state)
-  websocket?
-  (uri websocket-uri)
-  (socket websocket-socket)
-  (entropy-port websocket-entropy-port)
-  (state websocket-state set-websocket-state!))
+    (set-nonblocking! sock)
+    ;; Disable buffering for websockets
+    (setvbuf sock 'none)
 
-(define (display-websocket ws port)
-  (format port "#<websocket ~a ~a>"
-          (uri->string (websocket-uri ws))
-          (websocket-state ws)))
+    ;; TODO: Configure I/O buffering?
+    (connect sock (addrinfo:addr info))
+    sock))
 
-(set-record-type-printer! <websocket> display-websocket)
+(define-method (write (o <websocket>) port)
+   (format port "#<websocket ~a ~a>"
+           (.url o)
+           (.state o)))
 
-(define (websocket-connecting? ws)
-  "Return #t if the WebSocket WS is in the connecting state."
-  (eq? (websocket-state ws) 'connecting))
+(define-method (websocket-connecting? (websocket <websocket>))
+  "Return #t if WEBSOCKET is in the connecting state."
+  (eq? (.state websocket) 'connecting))
 
-(define (websocket-open? ws)
-  "Return #t if the WebSocket WS is in the open state."
-  (eq? (websocket-state ws) 'open))
+(define-method (websocket-open? (websocket <websocket>))
+  "Return #t if WEBSOCKET is in the open state."
+  (eq? (.state websocket) 'open))
 
-(define (websocket-closing? ws)
-  "Return #t if the WebSocket WS is in the closing state."
-  (eq? (websocket-state ws) 'closing))
+(define-method (websocket-closing? (websocket <websocket>))
+  "Return #t if WEBSOCKET is in the closing state."
+  (eq? (.state websocket) 'closing))
 
-(define (websocket-closed? ws)
-  "Return #t if the WebSocket WS is in the closed state."
-  (eq? (websocket-state ws) 'closed))
+(define-method (websocket-closed? (websocket <websocket>))
+  "Return #t if WEBSOCKET is in the closed state."
+  (eq? (.state websocket) 'closed))
 
-(define (generate-client-key ws)
+(define-method (generate-client-key (websocket <websocket>))
   "Return a random, base64 encoded nonce using the entropy source of
-WS."
+WEBSOCKET."
   (base64-encode
-   (get-bytevector-n (websocket-entropy-port ws) 16)))
+   (get-bytevector-n (.entropy-port websocket) 16)))
 
 ;; See Section 4.1 - Client Requirements
 (define (make-handshake-request uri key)
@@ -129,12 +264,12 @@ KEY."
                    (sec-websocket-version . "13"))))
     (build-request uri #:method 'GET #:headers headers)))
 
-(define (handshake ws)
-  "Perform the WebSocket handshake for the client WS."
-  (let ((key (generate-client-key ws)))
-    (write-request (make-handshake-request (websocket-uri ws) key)
-                   (websocket-socket ws))
-    (let* ((response (read-response (websocket-socket ws)))
+(define-method (handshake (websocket <websocket>))
+  "Perform the WebSocket handshake for the client WEBSOCKET."
+  (let ((key (generate-client-key websocket)))
+    (write-request (make-handshake-request (.uri websocket) key)
+                   (.socket websocket))
+    (let* ((response (read-response (.socket websocket)))
            (headers (response-headers response))
            (upgrade (assoc-ref headers 'upgrade))
            (connection (assoc-ref headers 'connection))
@@ -144,10 +279,12 @@ KEY."
                (string-ci=? (car upgrade) "websocket")
                (equal? connection '(upgrade))
                (string=? (string-trim-both accept) (make-accept-key key)))
-          (set-websocket-state! ws 'open)
+          (set! (.state websocket) 'open)
           (begin
-            (close-websocket ws)
-            (error "websocket handshake failed" (websocket-uri ws)))))))
+            (websocket-close websocket)
+            ((.on-error websocket) websocket
+             (format #f "websocket handshake failed: ~s"
+                     (uri->string (.uri websocket)))))))))
 
 (define (open-entropy-port)
   "Return an open input port to a reliable source of entropy for the
@@ -156,25 +293,10 @@ current system."
   ;; exactly portable.
   (open-input-file "/dev/urandom"))
 
-(define (make-websocket uri-or-string)
-  "Create and establish a new WebSocket connection for the remote
-resource described by URI-OR-STRING."
-  (let ((uri (match uri-or-string
-               ((? uri? uri) uri)
-               ((? string? str) (string->uri str)))))
-    (if (websocket-uri? uri)
-        (let ((ws (%make-websocket uri
-                                   (make-client-socket uri)
-                                   (open-entropy-port)
-                                   'connecting)))
-          (handshake ws)
-          ws)
-        (error "not a websocket uri" uri))))
-
-(define (close-websocket ws)
-  "Close the WebSocket connection for the client WS."
-  (let ((socket (websocket-socket ws)))
-    (set-websocket-state! ws 'closing)
+(define-method (websocket-close (websocket <websocket>))
+  "Close the WebSocket connection for the client WEBSOCKET."
+  (let ((socket (.socket websocket)))
+    (set! (.state websocket) 'closing)
     (write-frame (make-close-frame (make-bytevector 0)) socket)
     ;; Per section 5.5.1 , wait for the server to close the connection
     ;; for a reasonable amount of time.
@@ -185,26 +307,5 @@ resource described by URI-OR-STRING."
            (read-frame socket) ; throw it away
            (loop)))))
     (close-port socket)
-    (close-port (websocket-entropy-port ws))
-    (set-websocket-state! ws 'closed)
-    *unspecified*))
-
-(define (generate-masking-key ws)
-  "Create a new masking key using the entropy source of WS."
-  ;; Masking keys are 32 bits long.
-  (get-bytevector-n (websocket-entropy-port ws) 4))
-
-(define (websocket-send ws data)
-  "Send DATA, a string or bytevector, to the server that WS is
-connected to."
-  ;; TODO: Send frames over some threshold in fragments.
-  (write-frame (make-text-frame data (generate-masking-key ws))
-               (websocket-socket ws)))
-
-(define (websocket-receive ws)
-  "Read a response from the server that WS is connected to."
-  ;; TODO: Handle fragmented frames and control frames.
-  (let ((frame (read-frame (websocket-socket ws))))
-    (if (binary-frame? frame)
-        (frame-data frame)
-        (text-frame->string frame))))
+    (close-port (.entropy-port websocket))
+    (set! (.state websocket) 'closed)))
diff --git a/8sync/systems/websocket/server.scm b/8sync/systems/websocket/server.scm
index c29ce51..2a91b92 100644
--- a/8sync/systems/websocket/server.scm
+++ b/8sync/systems/websocket/server.scm
@@ -1,7 +1,7 @@
 ;;; guile-websocket --- WebSocket client/server
 ;;; Copyright © 2015 David Thompson <davet@gnu.org>
 ;;; Copyright © 2017 Christopher Allan Webber <cwebber@dustycloud.org>
-;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;; Copyright © 2019, 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of guile-websocket.
 ;;;
@@ -36,17 +36,10 @@
   #:use-module (8sync)
   #:use-module (8sync ports)
   #:use-module (8sync systems web)
+  #:use-module (8sync systems websocket client)
   #:use-module (8sync systems websocket frame)
   #:use-module (8sync systems websocket utils)
-  #:export (<websocket-server>
-            .websocket-handler))
-
-;; See section 4.2 for explanation of the handshake.
-(define (read-handshake-request client-socket)
-  "Read HTTP request from CLIENT-SOCKET that should contain the
-headers required for a WebSocket handshake."
-  ;; See section 4.2.1.
-  (read-request client-socket))
+  #:export (<websocket-server>))
 
 (define (make-handshake-response client-key)
   "Return an HTTP response object for upgrading to a WebSocket
@@ -61,124 +54,50 @@ string."
 
 (define no-op (const #f))
 
-(define (make-simple-counter)
-  (let ((count 0))
-    (lambda ()
-      (set! count (1+ count))
-      count)))
-
 (define-actor <websocket-server> (<web-server>)
-  ((ws-send websocket-server-send))
+  ()
   (upgrade-paths #:init-value `(("websocket" .
-                                 ,(wrap-apply websocket-client-loop)))
+                                 ,(wrap-apply make-websocket-actor)))
                  #:allocation #:each-subclass
                  #:accessor .upgrade-paths)
 
-  (gen-client-id #:init-thunk make-simple-counter)
-
-  ;; active websocket connections
-  (ws-clients #:init-thunk make-hash-table
-              #:accessor .ws-clients)
-
-  (on-ws-message #:init-keyword #:on-ws-message 
-                 #:getter .on-ws-message)
-  (on-ws-client-connect #:init-keyword #:on-ws-client-connect
-                        #:init-value no-op
-                        #:getter .on-ws-client-connect)
-  (on-ws-client-disconnect #:init-keyword #:on-ws-client-disconnect
-                           #:init-value no-op
-                           #:getter .on-ws-client-disconnect))
-
-(define (web-server-gen-client-id websocket-server)
-  ((slot-ref websocket-server 'gen-client-id)))
-
-(define (websocket-client-loop websocket-server client request body)
-  "Serve client connected via CLIENT by performing the HTTP
-handshake and listening for control and data frames.  HANDLER is
-called for each complete message that is received."
-  ;; TODO: We'll also want to handle stuff like the sub-protocol.
-  (define (handle-data-frame type data)
-    ((.on-ws-message websocket-server)
-     websocket-server client-id
-     (match type
-       ('text   (utf8->string data))
-       ('binary data))))
-
-  (define (read-frame-maybe)
-    (and (not (eof-object? (lookahead-u8 client)))
-         (read-frame client)))
-
-  ;; Allows other actors to send things to this specific client
-  ;; @@: We probably could just increment a counter...
-  (define client-id (web-server-gen-client-id websocket-server))
-
-  (define (close-down)
-    (close-port client)
-    (hash-remove! (.ws-clients websocket-server) client-id)
-    ((.on-ws-client-disconnect websocket-server)
-     websocket-server client-id))
-
-  (hash-set! (.ws-clients websocket-server) client-id client)
+  (on-ws-connection #:init-keyword #:on-ws-connection
+                    #:init-value no-op
+                    #:getter .on-ws-connection)
+
+  (on-ws-close #:init-keyword #:on-ws-close
+                    #:init-value no-op
+                    #:getter .on-ws-close)
+  (on-ws-error #:init-keyword #:on-ws-error
+                    #:init-value no-op
+                    #:getter .on-ws-error)
+  (on-ws-message #:init-keyword #:on-ws-message
+                    #:init-value no-op
+                    #:getter .on-ws-message)
+  (on-ws-open #:init-keyword #:on-ws-open
+                    #:init-value no-op
+                    #:getter .on-ws-open))
+
+(define (make-websocket-actor websocket-server client request body)
+  "Setup websocket actor connected via CLIENT by performing the HTTP
+handshake."
 
   ;; Disable buffering for websockets
   (setvbuf client 'none)
 
-  ((.on-ws-client-connect websocket-server)
-   websocket-server client-id)
-
   ;; Perform the HTTP handshake and upgrade to WebSocket protocol.
   (let* ((client-key (assoc-ref (request-headers request) 'sec-websocket-key))
          (response (make-handshake-response client-key)))
-    (write-response response client)
-    (let loop ((fragments '())
-               (type #f))
-      (let ((frame (read-frame-maybe)))
-        (cond
-         ;; EOF - port is closed.
-         ;; @@: Sometimes the eof object appears here as opposed to
-         ;;   at lookahead, but I'm not sure why
-         ((or (not frame) (eof-object? frame))
-          (close-down))
-         ;; Per section 5.4, control frames may appear interspersed
-         ;; along with a fragmented message.
-         ((close-frame? frame)
-          ;; Per section 5.5.1, echo the close frame back to the
-          ;; client before closing the socket.  The client may no
-          ;; longer be listening.
-          (false-if-exception
-           (write-frame (make-close-frame (frame-data frame)) client))
-          (close-down))
-         ((ping-frame? frame)
-          ;; Per section 5.5.3, a pong frame must include the exact
-          ;; same data as the ping frame.
-          (write-frame (make-pong-frame (frame-data frame)) client)
-          (loop fragments type))
-         ((pong-frame? frame) ; silently ignore pongs
-          (loop fragments type))
-         ((first-fragment-frame? frame) ; begin accumulating fragments
-          (loop (list frame) (frame-type frame)))
-         ((final-fragment-frame? frame) ; concatenate all fragments
-          (handle-data-frame type (frame-concatenate
-                                   (reverse (cons frame fragments))))
-          (loop '() #f))
-         ((fragment-frame? frame) ; add a fragment
-          (loop (cons frame fragments) type))
-         ((data-frame? frame) ; unfragmented data frame
-          (handle-data-frame (frame-type frame) (frame-data frame))
-          (loop '() #f)))))))
-
-(define (websocket-server-send websocket-server message client-id data)
-  (cond ((hash-ref (.ws-clients websocket-server) client-id) =>
-         (lambda (client)
-           (write-frame
-            (cond ((string? data)
-                   (make-text-frame data))
-                  ((bytevector? data)
-                   (make-binary-frame data)))
-            client)
-           ;; ok is like success, amirite
-           (<-reply message 'ok)))
-        (else
-         ;; No such client with that id.
-         ;; Either it closed, or it was never there.
-         (<-reply message 'client-gone))))
+    (write-response response client))
+
+  (let* ((websocket-id (create-actor websocket-server <websocket>
+                                     #:socket client
+                                     #:state 'open
+                                     #:on-close (.on-ws-close websocket-server)
+                                     #:on-error (.on-ws-error websocket-server)
+                                     #:on-message (.on-ws-message websocket-server)
+                                     #:on-open (.on-ws-open websocket-server)))
+         (hive ((@@ (8sync actors) actor-hive) websocket-server))
+         (websocket ((@@ (8sync actors) hive-resolve-local-actor) hive websocket-id)))
+    ((.on-ws-connection websocket-server) websocket-id)
+    (websocket-loop websocket 'message)))
diff --git a/Makefile.am b/Makefile.am
index ea4061a..bc75d48 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -91,7 +91,11 @@ EXTRA_DIST = 						\
 	demos/ircbot.scm				\
 	demos/actors/botherbotherbother.scm		\
 	demos/actors/simplest-possible.scm		\
-	demos/actors/robotscanner.scm
+	demos/actors/robotscanner.scm			\
+	demos/websocket/8s-client.scm			\
+	demos/websocket/8s-server.scm			\
+	demos/websocket/ws-client.js			\
+	demos/websocket/ws-server.js
 
 
 ## Make changelog on demand
diff --git a/demos/websocket/8s-client.scm b/demos/websocket/8s-client.scm
new file mode 100755
index 0000000..09fe137
--- /dev/null
+++ b/demos/websocket/8s-client.scm
@@ -0,0 +1,61 @@
+#! /usr/bin/env guile
+# -*-scheme-*-
+!#
+
+;;; 8sync --- Asynchronous programming for Guile
+;;; Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of 8sync.
+;;;
+;;; 8sync is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU Lesser General Public License as
+;;; published by the Free Software Foundation, either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; 8sync is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU Lesser General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with 8sync.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (8s-client)
+  #:use-module (oop goops)
+  #:use-module (8sync)
+  #:use-module (8sync systems websocket client)
+
+  #:export (main))
+
+(define %default-server "ws://localhost:1236")
+
+(define-actor <sleeper> (<actor>)
+  ((*init* sleeper-loop))
+  (sleep-secs #:init-value 3 #:getter sleeper-sleep-secs))
+
+(define (sleeper-loop actor message)
+  (while (actor-alive? actor)
+    (display "Zzzzzzzz....\n")
+    ;; Sleep for a bit
+    (8sleep (sleeper-sleep-secs actor))))
+
+(define (main . args)
+  (let* ((hive (make-hive))
+         (sleeper (bootstrap-actor hive <sleeper>))
+         (websocket-id (bootstrap-actor hive <websocket>
+                                        #:url %default-server ;; toggle open with url/with message
+                                        #:on-close (lambda (ws)
+                                                     (format (current-error-port) "on-close: ~s\n" ws))
+                                        #:on-error (lambda (ws e)
+                                                     (format (current-error-port) "on-error: ~s:~s\n" ws e))
+                                        #:on-message (lambda (ws msg)
+                                                       (format (current-error-port) "on-message: ~s:~s\n" ws msg))
+                                        #:on-open (lambda (ws)
+                                                    (format (current-error-port) "on-open: ~s\n" ws)
+                                                    (websocket-send ws 'message "Hello, Web Socket!"))))
+         (websocket ((@@ (8sync actors) hive-resolve-local-actor) hive websocket-id)))
+    (if (.url websocket)
+        (run-hive hive '())
+        (run-hive hive (list (bootstrap-message hive websocket-id 'open %default-server))))))
+
+(main (command-line))
diff --git a/demos/websocket/8s-server.scm b/demos/websocket/8s-server.scm
new file mode 100755
index 0000000..45e62ba
--- /dev/null
+++ b/demos/websocket/8s-server.scm
@@ -0,0 +1,76 @@
+#! /usr/bin/env guile
+# -*-scheme-*-
+!#
+
+;;; 8sync --- Asynchronous programming for Guile
+;;; Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of 8sync.
+;;;
+;;; 8sync is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU Lesser General Public License as
+;;; published by the Free Software Foundation, either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; 8sync is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU Lesser General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with 8sync.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (8s-server)
+  #:use-module (oop goops)
+  #:use-module (8sync)
+  #:use-module (8sync systems web)
+  #:use-module (8sync systems websocket client)
+  #:use-module (8sync systems websocket server)
+  #:export (main))
+
+(define %server-port 1236)
+
+(define-actor <sleeper> (<actor>)
+  ((*init* sleeper-loop))
+  (sleep-secs #:init-value 3 #:getter sleeper-sleep-secs))
+
+(define (sleeper-loop actor message)
+  (while (actor-alive? actor)
+    (display "Zzzzzzzz....\n")
+    ;; Sleep for a bit
+    (8sleep (sleeper-sleep-secs actor))))
+
+(define (main . args)
+  (let* ((hive (make-hive))
+         (sleeper (bootstrap-actor hive <sleeper>))
+         (server (bootstrap-actor
+                  hive <websocket-server>
+                  #:port %server-port
+                  #:on-ws-connection
+                  (lambda (ws)
+                    (format (current-error-port) "on-ws-connection: ws=~s\n" ws)
+                    (when #f
+                      (set! (.on-close ws)
+                           (lambda (ws)
+                             (format (current-error-port) "on-close: ~s\n" ws)))
+                      (set! (.on-error ws)
+                            (lambda (ws e)
+                              (format (current-error-port) "on-error: ~s, ~s\n" ws e)))
+                      (set! (.on-message ws)
+                            (lambda (ws msg)
+                              (format (current-error-port) "on-message: ~s\n" msg)))
+                      (set! (.on-open ws)
+                            (lambda (ws)
+                              (format (current-error-port) "on-open: ~s\n" ws)))))
+                  #:on-ws-close (lambda (ws)
+                                 (format (current-error-port) "on-close: ~s\n" ws))
+                  #:on-ws-error (lambda (ws e)
+                                  (format (current-error-port) "on-error: ~s: ~s\n" ws e))
+                  #:on-ws-message (lambda (ws msg)
+                                    (format (current-error-port) "on-message: ~s: ~s\n" ws msg))
+                  #:on-ws-open (lambda (ws)
+                                 (format (current-error-port) "on-open: ~s\n" ws)))))
+    (format (current-error-port) "listening: ~s\n" %server-port)
+    (run-hive hive '())))
+
+(main (command-line))
diff --git a/demos/websocket/node-client.js b/demos/websocket/node-client.js
new file mode 100644
index 0000000..401d3b7
--- /dev/null
+++ b/demos/websocket/node-client.js
@@ -0,0 +1,26 @@
+#! /usr/bin/env node
+
+var default_server = 'ws://localhost:1236';
+
+// npm install -g ws
+function main () {
+  var ws = new require ('ws') (default_server);
+  ws.onopen = function () {
+    console.log ('ws.onopen');
+    process.nextTick (function () {
+      ws.send ('Hello Web Socket');
+    });
+  }
+  ws.onerror = function (e) {
+    console.log ('ws.onerror: e=%s', '' + e);
+  }
+  ws.onclose = function () {
+    console.log ('ws.onclose');
+  }
+  ws.onmessage = function (event) {
+    var msg = event.data;
+    console.log ('ws.onmessage: ws=%j, msg=%s', msg);
+  };
+}
+
+main ();
diff --git a/demos/websocket/ws-client.html b/demos/websocket/ws-client.html
new file mode 100644
index 0000000..5e9c811
--- /dev/null
+++ b/demos/websocket/ws-client.html
@@ -0,0 +1,43 @@
+<!--
+    8sync --- Asynchronous programming for Guile
+    Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+
+    This file is part of 8sync.
+
+    8sync is free software: you can redistribute it and/or modify it
+    under the terms of the GNU Lesser General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    8sync is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with 8sync.  If not, see <http://www.gnu.org/licenses/>.
+!-->
+<meta charset="utf8">
+<html>
+  <head>
+    <title>Ws test</title>
+  </head>
+  <body>
+    <p id="log"></p>
+    <script>
+      var server = "ws://localhost:1236";
+      var log = document.getElementById ("log");
+      console.log ('log=%j', log);
+      console.log ('document=%j', document);
+      console.log ('body=%j', document.body);
+      var ws = new WebSocket (server);
+      ws.onopen = function () {
+        console.log ('open!'); log.innerHTML += 'open!<br>';
+        ws.send ('Hello, Web Socket!');
+        ws.send ('Say: ' + 'A'.repeat (Math.pow (2, 16)) + '\n');
+      };
+      ws.close = function () { console.log ('close!'); log.innerHTML += 'close!<br>'; };
+      ws.onmessage = function () { console.log ('message'); log.innerHTML += 'message!<br>'; };
+    </script>
+  </body>
+</html>
diff --git a/demos/websocket/ws-client.js b/demos/websocket/ws-client.js
new file mode 100755
index 0000000..134fa01
--- /dev/null
+++ b/demos/websocket/ws-client.js
@@ -0,0 +1,44 @@
+#! /usr/bin/env node
+
+/// 8sync --- Asynchronous programming for Guile
+/// Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+///
+/// This file is part of 8sync.
+///
+/// 8sync is free software: you can redistribute it and/or modify it
+/// under the terms of the GNU Lesser General Public License as
+/// published by the Free Software Foundation, either version 3 of the
+/// License, or (at your option) any later version.
+///
+/// 8sync is distributed in the hope that it will be useful,
+/// but WITHOUT ANY WARRANTY; without even the implied warranty of
+/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+/// GNU Lesser General Public License for more details.
+///
+/// You should have received a copy of the GNU Lesser General Public
+/// License along with 8sync.  If not, see <http://www.gnu.org/licenses/>.
+
+var default_server = 'ws://localhost:1236';
+
+// npm install -g ws
+function main () {
+  var ws = new require ('ws') (default_server);
+  ws.onopen = function () {
+    console.log ('ws.onopen');
+    process.nextTick (function () {
+      ws.send ('Hello Web Socket');
+    });
+  }
+  ws.onerror = function (e) {
+    console.log ('ws.onerror: e=%s', '' + e);
+  }
+  ws.onclose = function () {
+    console.log ('ws.onclose');
+  }
+  ws.onmessage = function (event) {
+    var msg = event.data;
+    console.log ('ws.onmessage: msg=%s', msg);
+  };
+}
+
+main ();
diff --git a/demos/websocket/ws-server.js b/demos/websocket/ws-server.js
new file mode 100755
index 0000000..47a4209
--- /dev/null
+++ b/demos/websocket/ws-server.js
@@ -0,0 +1,48 @@
+#! /usr/bin/env node
+
+/// 8sync --- Asynchronous programming for Guile
+/// Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+///
+/// This file is part of 8sync.
+///
+/// 8sync is free software: you can redistribute it and/or modify it
+/// under the terms of the GNU Lesser General Public License as
+/// published by the Free Software Foundation, either version 3 of the
+/// License, or (at your option) any later version.
+///
+/// 8sync is distributed in the hope that it will be useful,
+/// but WITHOUT ANY WARRANTY; without even the implied warranty of
+/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+/// GNU Lesser General Public License for more details.
+///
+/// You should have received a copy of the GNU Lesser General Public
+/// License along with 8sync.  If not, see <http://www.gnu.org/licenses/>.
+
+var server_port = 1236;
+
+// npm install -g ws
+function main () {
+  var wss = new require ('ws').Server ({port:server_port});
+  console.log ('listening: %s', server_port);
+  wss.on ('connection', function (ws) {
+    ws.onopen = function () {
+      console.log ('ws.onopen');
+      // process.nextTick (function () {
+      //   ws.send ('Hello Web Socket');
+      //   ws.close ();
+      // });
+    }
+    ws.onerror = function (e) {
+      console.log ('ws.onerror: e=%s', '' + e);
+    }
+    ws.onclose = function () {
+      console.log ('ws.onclose');
+    }
+    ws.onmessage = function (event) {
+      var msg = event.data;
+      console.log ('ws.onmessage: msg=%s', msg);
+    };
+  });
+}
+
+main ();
-- 
2.31.1