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authorDavid Thompson <dthompson2@worcester.edu>2016-03-25 10:57:20 -0400
committerDavid Thompson <dthompson2@worcester.edu>2016-03-25 10:57:20 -0400
commitccecc46b64a24c6e9ec01c9e5d3a9fcb2295fcf0 (patch)
tree7feb6269f4d496607b265a6a5f7bd795631acd81 /web/socket/client.scm
parentad05624ca326bc462c6007f421df92837cd4d8d9 (diff)
client: Keep track of socket state.
* web/socket/client.scm (<websocket>)[state]: New field. (websocket-state, set-websocket-state!): New field accessors. (websocket-connecting?, websocket-open?, websocket-closing?, websocket-closed?): New procedures. (handshake): Set socket to 'open' state after successful handshake. (make-websocket): Set socket to 'connecting' state initially. (close-websocket): Set socket to 'closing' before sending close frame, and then to 'closed' underlying TCP socket is closed.
Diffstat (limited to 'web/socket/client.scm')
-rw-r--r--web/socket/client.scm49
1 files changed, 37 insertions, 12 deletions
diff --git a/web/socket/client.scm b/web/socket/client.scm
index 7be9c2c..3c32894 100644
--- a/web/socket/client.scm
+++ b/web/socket/client.scm
@@ -37,6 +37,11 @@
#:export (make-websocket
websocket?
websocket-uri
+ websocket-state
+ websocket-connecting?
+ websocket-open?
+ websocket-closing?
+ websocket-closed?
close-websocket
websocket-send
websocket-receive))
@@ -74,12 +79,28 @@ scheme."
(connect s (addrinfo:addr info))
s))
-;; TODO: Add 'state' field (connecting, open, closing, closed)
(define-record-type <websocket>
- (%make-websocket uri socket)
+ (%make-websocket uri socket state)
websocket?
(uri websocket-uri)
- (socket websocket-socket))
+ (socket websocket-socket)
+ (state websocket-state set-websocket-state!))
+
+(define (websocket-connecting? ws)
+ "Return #t if the WebSocket WS is in the connecting state."
+ (eq? (websocket-state ws) 'connecting))
+
+(define (websocket-open? ws)
+ "Return #t if the WebSocket WS is in the open state."
+ (eq? (websocket-state ws) 'open))
+
+(define (websocket-closing? ws)
+ "Return #t if the WebSocket WS is in the closing state."
+ (eq? (websocket-state ws) 'closing))
+
+(define (websocket-closed? ws)
+ "Return #t if the WebSocket WS is in the closed state."
+ (eq? (websocket-state ws) 'closed))
;; See Section 4.1 - Client Requirements
(define (make-handshake-request uri)
@@ -103,13 +124,15 @@ remote resource described by URI."
(connection (assoc-ref headers 'connection))
(accept (assoc-ref headers 'sec-websocket-accept)))
;; Validate the handshake.
- (unless (and (= (response-code response) 101)
- (string-ci=? (car upgrade) "websocket")
- (equal? connection '(upgrade))
- ;; TODO: authenticate accept key.
- )
- (close-websocket ws)
- (error "websocket handshake failed" (websocket-uri ws)))))
+ (if (and (= (response-code response) 101)
+ (string-ci=? (car upgrade) "websocket")
+ (equal? connection '(upgrade))
+ ;; TODO: authenticate accept key.
+ )
+ (set-websocket-state! ws 'open)
+ (begin
+ (close-websocket ws)
+ (error "websocket handshake failed" (websocket-uri ws))))))
(define (make-websocket uri-or-string)
"Create and establish a new WebSocket connection for the remote
@@ -118,7 +141,7 @@ resource described by URI-OR-STRING."
((? uri? uri) uri)
((? string? str) (string->uri str)))))
(if (websocket-uri? uri)
- (let ((ws (%make-websocket uri (make-client-socket uri))))
+ (let ((ws (%make-websocket uri (make-client-socket uri) 'connecting)))
(handshake ws)
ws)
(error "not a websocket uri" uri))))
@@ -126,6 +149,7 @@ resource described by URI-OR-STRING."
(define (close-websocket ws)
"Close the WebSocket connection for the client WS."
(let ((socket (websocket-socket ws)))
+ (set-websocket-state! ws '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.
@@ -135,7 +159,8 @@ resource described by URI-OR-STRING."
(unless (port-eof? socket)
(read-frame socket) ; throw it away
(loop)))))
- (close-port socket)))
+ (close-port socket)
+ (set-websocket-state! ws 'closed)))
(define (websocket-send ws data)
"Send DATA, a string or bytevector, to the server that WS is