New web driver
This commit is contained in:
parent
4f570fcd18
commit
d36ccbb0c2
|
@ -0,0 +1,404 @@
|
|||
#lang syndicate/actor
|
||||
;; More general web driver: supports normal HTTP as well as websockets.
|
||||
|
||||
(provide (struct-out web-virtual-host)
|
||||
(struct-out web-resource)
|
||||
url->resource
|
||||
|
||||
(struct-out web-request)
|
||||
(struct-out web-request-header)
|
||||
|
||||
(struct-out web-response-header)
|
||||
(struct-out web-response-complete)
|
||||
(struct-out web-response-chunked)
|
||||
(struct-out web-response-websocket)
|
||||
|
||||
(struct-out web-response-chunk)
|
||||
(struct-out websocket-message)
|
||||
|
||||
spawn-web-driver)
|
||||
|
||||
(require net/url)
|
||||
(require net/rfc6455)
|
||||
(require net/rfc6455/conn-api)
|
||||
(require net/rfc6455/dispatcher)
|
||||
(require net/http-client)
|
||||
(require racket/exn)
|
||||
(require racket/tcp)
|
||||
(require racket/set)
|
||||
(require racket/async-channel)
|
||||
(require (only-in racket/bytes bytes-join))
|
||||
(require (only-in racket/list flatten))
|
||||
(require (only-in racket/port port->bytes))
|
||||
(require web-server/http/bindings)
|
||||
(require web-server/http/request)
|
||||
(require web-server/http/request-structs)
|
||||
(require web-server/http/response)
|
||||
(require web-server/http/response-structs)
|
||||
(require web-server/private/connection-manager)
|
||||
(require (only-in web-server/private/util lowercase-symbol!))
|
||||
(require web-server/dispatchers/dispatch)
|
||||
|
||||
(require/activate "timer.rkt")
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
(struct web-virtual-host (scheme name port) #:prefab)
|
||||
(struct web-resource (virtual-host path) #:prefab)
|
||||
|
||||
(struct web-request (id direction header* body) #:prefab)
|
||||
(struct web-request-header (method resource headers query) #:prefab)
|
||||
|
||||
(struct web-response-header (code message last-modified-seconds mime-type headers) #:prefab)
|
||||
(struct web-response-complete (id header body) #:prefab)
|
||||
(struct web-response-chunked (id header) #:prefab)
|
||||
(struct web-response-websocket (id headers) #:prefab)
|
||||
|
||||
(struct web-response-chunk (id bytes) #:prefab)
|
||||
(struct websocket-message (id direction body) #:prefab)
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
;; Ground-level communication messages
|
||||
|
||||
(struct web-raw-request (id port connection req control-ch) #:prefab)
|
||||
(struct web-raw-client-conn (id connection) #:prefab)
|
||||
(struct web-incoming-message (id message) #:prefab)
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
(define web-server-max-waiting (make-parameter 511)) ;; sockets
|
||||
(define web-server-connection-manager (make-parameter #f))
|
||||
(define web-server-initial-connection-timeout (make-parameter 30)) ;; seconds
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
(define (url->resource u)
|
||||
(web-resource (web-virtual-host (url-scheme u)
|
||||
(url-host u)
|
||||
(url-port u))
|
||||
(format-url-path u)))
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
(define (spawn-web-driver)
|
||||
(actor #:name 'web-server-manager
|
||||
(react
|
||||
(during/actor (web-virtual-host "http" _ $port)
|
||||
#:name (list 'web-server port)
|
||||
(setup-web-server "http"
|
||||
(or (web-server-connection-manager)
|
||||
(start-connection-manager))
|
||||
port))))
|
||||
(actor #:name 'web-client-manager
|
||||
(react
|
||||
(on (message (web-request $id 'outbound $req $body))
|
||||
(actor #:name (list 'web-client id)
|
||||
(do-client-request id req body))))))
|
||||
|
||||
(define (setup-web-server scheme cm port)
|
||||
(define listener (tcp-listen port (web-server-max-waiting) #t))
|
||||
(define listener-control (make-channel))
|
||||
(thread (lambda ()
|
||||
(let loop ()
|
||||
(sync (handle-evt (tcp-accept-evt listener)
|
||||
(lambda (ports)
|
||||
(handle-incoming-connection port cm ports)
|
||||
(loop)))
|
||||
(handle-evt listener-control
|
||||
(match-lambda
|
||||
['quit (void)]))))))
|
||||
|
||||
(on-stop (channel-put listener-control 'quit))
|
||||
|
||||
(on (message (web-raw-request $id port $conn $lowlevel-req $control-ch) #:meta-level 1)
|
||||
(define web-req (web-request id
|
||||
'inbound
|
||||
(web-request-header
|
||||
(string->symbol (string-downcase
|
||||
(bytes->string/latin-1
|
||||
(request-method lowlevel-req))))
|
||||
(web-resource (req->virtual-host scheme lowlevel-req port)
|
||||
(format-url-path (request-uri lowlevel-req)))
|
||||
(request-headers lowlevel-req)
|
||||
(url-query (request-uri lowlevel-req)))
|
||||
(request-post-data/raw lowlevel-req)))
|
||||
(actor #:name (list 'web-req id)
|
||||
(react (on-start (send! (set-timer (list 'web-req id) 100 'relative))
|
||||
(send! web-req))
|
||||
(stop-when (message (timer-expired (list 'web-req id) _))
|
||||
(do-response-complete control-ch
|
||||
id
|
||||
(web-response-header 404
|
||||
#"Not found"
|
||||
(current-seconds)
|
||||
#"text/plain"
|
||||
'())
|
||||
'()))
|
||||
(stop-when (message (web-response-complete id $rh $body))
|
||||
(do-response-complete control-ch id rh body))
|
||||
(stop-when (asserted (web-response-chunked id $rh))
|
||||
(do-response-chunked control-ch id rh))
|
||||
(stop-when (asserted (web-response-websocket id $headers))
|
||||
(do-response-websocket control-ch id headers))))))
|
||||
|
||||
(define (do-response-complete control-ch id rh constree-of-bytes)
|
||||
(match-define (web-response-header code resp-message last-modified-seconds mime-type headers) rh)
|
||||
(channel-put control-ch
|
||||
(list 'response
|
||||
(response/full code
|
||||
resp-message
|
||||
last-modified-seconds
|
||||
mime-type
|
||||
(build-headers headers)
|
||||
(flatten constree-of-bytes)))))
|
||||
|
||||
(define (do-response-chunked control-ch id rh)
|
||||
(match-define (web-response-header code resp-message last-modified-seconds mime-type headers) rh)
|
||||
(define stream-ch (make-async-channel))
|
||||
(react (stop-when (retracted (web-response-chunked id rh)))
|
||||
(on-stop (async-channel-put stream-ch #f))
|
||||
(on (message (web-response-chunk id $chunk))
|
||||
(async-channel-put stream-ch (flatten chunk)))
|
||||
(on-start (channel-put control-ch
|
||||
(list 'response
|
||||
(response code
|
||||
resp-message
|
||||
last-modified-seconds
|
||||
mime-type
|
||||
(build-headers headers)
|
||||
(lambda (output-port)
|
||||
(let loop ()
|
||||
(match (async-channel-get stream-ch)
|
||||
[#f
|
||||
(void)]
|
||||
[bss (for [(bs (in-list bss))]
|
||||
(write-bytes bs
|
||||
output-port))
|
||||
(loop)])))))))))
|
||||
|
||||
(define (do-response-websocket control-ch id headers)
|
||||
(define ws-ch (make-channel))
|
||||
(react (stop-when (retracted (web-response-websocket id headers)))
|
||||
(on-start (channel-put control-ch (list 'websocket headers ws-ch)))
|
||||
(run-websocket-connection id ws-ch)))
|
||||
|
||||
(define (run-websocket-connection id ws-ch)
|
||||
(on-stop (channel-put ws-ch 'quit))
|
||||
(on (message (websocket-message id 'outbound $body))
|
||||
(channel-put ws-ch (list 'send body)))
|
||||
(stop-when (message (web-incoming-message id (? eof-object? _)) #:meta-level 1))
|
||||
(on (message (web-incoming-message id $body) #:meta-level 1)
|
||||
(unless (eof-object? body) (send! (websocket-message id 'inbound body)))))
|
||||
|
||||
(define (req->virtual-host scheme r port)
|
||||
(cond [(assq 'host (request-headers r)) =>
|
||||
(lambda (h)
|
||||
(match (cdr h)
|
||||
[(regexp #px"(.*):(\\d+)" (list _ host port))
|
||||
(web-virtual-host scheme host (string->number port))]
|
||||
[host
|
||||
(web-virtual-host scheme host port)]))]
|
||||
[else
|
||||
(web-virtual-host scheme #f port)]))
|
||||
|
||||
(define (format-url-path u)
|
||||
(define elements (for/list [(p (in-list (url-path u)))]
|
||||
(match-define (path/param path-element params) p)
|
||||
(list* path-element params)))
|
||||
(foldr (lambda (e acc) (append e (list acc))) '() elements))
|
||||
|
||||
(define (build-headers hs)
|
||||
(for/list ((h (in-list hs)))
|
||||
(header (string->bytes/utf-8 (symbol->string (car h)))
|
||||
(string->bytes/utf-8 (cdr h)))))
|
||||
|
||||
(define (build-http-client-headers hs)
|
||||
(for/list ((h (in-list hs)))
|
||||
(format "~a: ~a" (car h) (cdr h))))
|
||||
|
||||
(define (handle-incoming-connection listen-port cm connection-ports)
|
||||
(thread
|
||||
(lambda ()
|
||||
(match-define (list i o) connection-ports)
|
||||
;; Deliberately construct an empty custodian for the connection. Killing the connection
|
||||
;; abruptly can cause deadlocks since the connection thread communicates with Syndicate
|
||||
;; via synchronous channels.
|
||||
(define conn
|
||||
(new-connection cm (web-server-initial-connection-timeout) i o (make-custodian) #f))
|
||||
(define control-ch (make-channel))
|
||||
(let do-request ()
|
||||
(define-values (req initial-headers) ;; TODO initial-headers?!?!
|
||||
(with-handlers ([exn:fail? (lambda (e) (values #f #f))])
|
||||
(read-request conn listen-port tcp-addresses)))
|
||||
(when req
|
||||
(define id (gensym 'web))
|
||||
(send-ground-message (web-raw-request id listen-port conn req control-ch))
|
||||
(sync (handle-evt control-ch
|
||||
(match-lambda
|
||||
[(list 'websocket reply-headers ws-ch)
|
||||
(with-handlers ((exn:dispatcher?
|
||||
(lambda (_e) (bad-request conn req))))
|
||||
((make-general-websockets-dispatcher
|
||||
(websocket-connection-main id ws-ch)
|
||||
(lambda _args (values reply-headers (void))))
|
||||
conn req))]
|
||||
[(list 'response resp)
|
||||
(output-response/method conn resp (request-method req))])))
|
||||
(do-request))))))
|
||||
|
||||
;; D-: uck barf
|
||||
;; TODO: something to fix this :-/
|
||||
(define (exn:fail:port-is-closed? e)
|
||||
(and (exn:fail? e)
|
||||
(regexp-match #px"port is closed" (exn-message e))))
|
||||
|
||||
(define ((websocket-connection-main id ws-ch) wsc _ws-connection-state)
|
||||
(let loop ()
|
||||
(sync (handle-evt wsc
|
||||
(lambda _args
|
||||
(define msg
|
||||
(with-handlers ([exn:fail:network? (lambda (e) eof)]
|
||||
[exn:fail:port-is-closed? (lambda (e) eof)]
|
||||
[exn:fail? (lambda (e)
|
||||
(log-error "Unexpected ws-recv error: ~a"
|
||||
(exn->string e))
|
||||
eof)])
|
||||
(ws-recv wsc #:payload-type 'text)))
|
||||
(send-ground-message (web-incoming-message id msg))
|
||||
(loop)))
|
||||
(handle-evt ws-ch
|
||||
(match-lambda
|
||||
['quit
|
||||
(void)]
|
||||
[(list 'send m)
|
||||
(with-handlers [(exn:fail:port-is-closed?
|
||||
(lambda (e)
|
||||
(ws-close! wsc)))]
|
||||
(ws-send! wsc m))
|
||||
(loop)]))))
|
||||
(ws-close! wsc))
|
||||
|
||||
(define (bad-request conn req)
|
||||
(output-response/method conn
|
||||
(response/full 400
|
||||
#"Bad request"
|
||||
(current-seconds)
|
||||
#"text/plain"
|
||||
(list)
|
||||
(list))
|
||||
(request-method req)))
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
(define (do-client-request id req body)
|
||||
(react
|
||||
(stop-when (asserted (observe (web-response-websocket id _)))
|
||||
(do-request-websocket id req))
|
||||
(stop-when (asserted (observe (web-response-complete id _ _)))
|
||||
(do-request-complete id req body))
|
||||
(stop-when (asserted (observe (web-response-chunked id _)))
|
||||
(do-request-chunked id req body))))
|
||||
|
||||
(define (analyze-outbound-request req)
|
||||
(match-define (web-request-header method
|
||||
(web-resource (web-virtual-host scheme host port) path)
|
||||
headers
|
||||
query)
|
||||
req)
|
||||
(values host
|
||||
(or port (match scheme
|
||||
["http" 80]
|
||||
["https" 443]
|
||||
[_ #f]))
|
||||
method
|
||||
(url->string (url scheme
|
||||
#f
|
||||
host
|
||||
port
|
||||
#t
|
||||
(let loop ((p path))
|
||||
(match p
|
||||
['() '()]
|
||||
[(list d par ... rest)
|
||||
(cons (path/param d par) (loop rest))]))
|
||||
query
|
||||
#f))
|
||||
headers))
|
||||
|
||||
(define (do-request-websocket id req)
|
||||
(define-values (_host server-port method urlstr headers) (analyze-outbound-request req))
|
||||
(define control-ch (make-channel))
|
||||
(if (not server-port)
|
||||
(send-ground-message (web-raw-client-conn id #f))
|
||||
(thread
|
||||
(lambda ()
|
||||
(log-info "Connecting to ~a ~a" urlstr (current-inexact-milliseconds))
|
||||
(define c (with-handlers [(exn? values)]
|
||||
(ws-connect (string->url urlstr) #:headers headers)))
|
||||
(when (exn? c)
|
||||
(log-info "Connection to ~a failed: ~a" urlstr (exn->string c)))
|
||||
(send-ground-message (web-raw-client-conn id c))
|
||||
(when (not (exn? c))
|
||||
(log-info "Connected to ~a ~a" url (current-inexact-milliseconds))
|
||||
((websocket-connection-main id control-ch) c (void))))))
|
||||
(react
|
||||
(stop-when (message (web-raw-client-conn id $c) #:meta-level 1)
|
||||
(react (stop-when (retracted (observe (web-response-websocket id _))))
|
||||
(if (ws-conn? c)
|
||||
(begin (assert (web-response-websocket id (ws-conn-headers c)))
|
||||
(run-websocket-connection id control-ch))
|
||||
(assert (web-response-websocket id #f)))))))
|
||||
|
||||
(define (do-request-complete id req body)
|
||||
(define-values (host server-port method urlstr headers) (analyze-outbound-request req))
|
||||
(thread
|
||||
(lambda ()
|
||||
(define response
|
||||
(with-handlers [(exn? values)]
|
||||
(when (not server-port)
|
||||
(error 'http-sendrecv "No server port specified"))
|
||||
(define-values (first-line header-lines body-port)
|
||||
(http-sendrecv host
|
||||
urlstr
|
||||
#:headers (build-http-client-headers headers)
|
||||
#:port server-port
|
||||
#:method (string-upcase (symbol->string method))
|
||||
#:data (bytes-join (flatten body) #"")))
|
||||
(match first-line
|
||||
[(regexp #px"\\S+\\s(\\d+)\\s(.*)" (list _ codebs msgbs))
|
||||
(define code (string->number (bytes->string/latin-1 codebs)))
|
||||
(define msg (bytes->string/utf-8 msgbs))
|
||||
(define response-headers
|
||||
(for/list ((h (in-list (read-headers (open-input-bytes
|
||||
(bytes-join header-lines #"\r\n"))))))
|
||||
(match-define (header k v) h)
|
||||
(cons (lowercase-symbol! (bytes->string/utf-8 k))
|
||||
(bytes->string/utf-8 v))))
|
||||
(define response-body (port->bytes body-port))
|
||||
(web-response-complete id
|
||||
(web-response-header code
|
||||
msg
|
||||
#f ;; TODO: fill in from response-headers
|
||||
(cond [(assq 'content-type response-headers)
|
||||
=> cdr]
|
||||
[else #f])
|
||||
response-headers)
|
||||
response-body)]
|
||||
[_
|
||||
(error 'http-sendrecv "Bad first line: ~v" first-line)])))
|
||||
(send-ground-message (web-raw-client-conn id response))))
|
||||
(react
|
||||
(stop-when (message (web-raw-client-conn id $r) #:meta-level 1)
|
||||
(react (stop-when (retracted (observe (web-response-complete id _ _))))
|
||||
(if (exn? r)
|
||||
(assert (web-response-websocket id #f #f))
|
||||
(begin (assert r)))))))
|
||||
|
||||
(define (do-request-chunked id req body)
|
||||
(log-error "do-request-chunked: unimplemented")
|
||||
(react (stop-when (retracted (observe (web-response-chunked id _))))
|
||||
(assert (web-response-chunked id #f))))
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
|
||||
(spawn-web-driver)
|
|
@ -0,0 +1,93 @@
|
|||
#lang syndicate/actor
|
||||
;; Simple demo of web driver
|
||||
|
||||
(require/activate syndicate/drivers/timer)
|
||||
(require/activate syndicate/drivers/web)
|
||||
(require net/url)
|
||||
|
||||
(define vh (web-virtual-host "http" ? 9090))
|
||||
|
||||
(define (sleep sec)
|
||||
(define timer-id (gensym 'sleep))
|
||||
(until (message (timer-expired timer-id _))
|
||||
(on-start (send! (set-timer timer-id (* sec 1000.0) 'relative)))))
|
||||
|
||||
(actor #:name 'server
|
||||
(react
|
||||
(field [counter 0])
|
||||
(assert vh)
|
||||
|
||||
(on (message (web-request $id
|
||||
'inbound
|
||||
($ req (web-request-header _ (web-resource vh `("ws" ())) _ _))
|
||||
_))
|
||||
(actor (react
|
||||
(assert (web-response-websocket id '()))
|
||||
(stop-when (retracted (observe (websocket-message id 'outbound _)))
|
||||
(log-info "Connection dropped"))
|
||||
(stop-when (message (websocket-message id 'inbound "quit"))
|
||||
(log-info "Received quit command"))
|
||||
(on (message (websocket-message id 'inbound $str))
|
||||
(log-info "Got ~v" str)
|
||||
(define u (string->url str))
|
||||
(when (url-scheme u)
|
||||
(let ((r (gensym 'client)))
|
||||
(react (on-start
|
||||
(send! (web-request r
|
||||
'outbound
|
||||
(web-request-header 'get
|
||||
(url->resource u)
|
||||
'()
|
||||
'())
|
||||
#"")))
|
||||
(stop-when (asserted (web-response-complete r $h $body))
|
||||
(log-info "Got headers back: ~v" h)
|
||||
(log-info "Got body back: ~v" body)))))
|
||||
(send! (websocket-message id 'outbound str))))))
|
||||
|
||||
(on (message (web-request $id
|
||||
'inbound
|
||||
(web-request-header 'get (web-resource vh `("slow" ())) _ _)
|
||||
_))
|
||||
(react (field [done? #f])
|
||||
(stop-when (rising-edge (done?)))
|
||||
(assert (web-response-chunked id
|
||||
(web-response-header 200
|
||||
#"Slowly"
|
||||
(current-seconds)
|
||||
#"text/plain"
|
||||
'())))
|
||||
(on (asserted (observe (web-response-chunk id _)))
|
||||
;;
|
||||
;; TODO: output-response-body/chunked in web-server's response.rkt
|
||||
;; doesn't flush each chunk as it appears. Should it?
|
||||
;;
|
||||
;; TODO: this kind of protocol pattern appears quite frequently. Perhaps
|
||||
;; we want a general-purpose *stream* protocol? For use by TCP,
|
||||
;; websockets, etc etc.
|
||||
;;
|
||||
(send! (web-response-chunk id #"first\n"))
|
||||
(sleep 2)
|
||||
(send! (web-response-chunk id #"second\n"))
|
||||
(sleep 2)
|
||||
(send! (web-response-chunk id #"third\n"))
|
||||
(sleep 2)
|
||||
(done? #t))))
|
||||
|
||||
(on (message (web-request $id
|
||||
'inbound
|
||||
(web-request-header 'get (web-resource vh `("foo" ,$path)) _ _)
|
||||
_))
|
||||
(define req-num (counter))
|
||||
(counter (+ (counter) 1))
|
||||
(send! (web-response-complete
|
||||
id
|
||||
(web-response-header 200
|
||||
#"OK"
|
||||
(current-seconds)
|
||||
#"text/plain"
|
||||
'())
|
||||
(string->bytes/utf-8
|
||||
(format "Hi there. Your path was ~v, and this is request ~a"
|
||||
path
|
||||
req-num)))))))
|
Loading…
Reference in New Issue