TCP client driver, and provides

This commit is contained in:
Tony Garnock-Jones 2021-06-10 10:42:59 +02:00
parent 336811c51e
commit 45e8c29976
1 changed files with 182 additions and 75 deletions

View File

@ -2,6 +2,14 @@
;;; SPDX-License-Identifier: LGPL-3.0-or-later
;;; SPDX-FileCopyrightText: Copyright © 2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
(provide (all-from-out syndicate/schemas/gen/tcp)
spawn-tcp-driver
accept-connection
establish-connection
send-data
read-bytes-avail)
(require racket/tcp)
(require syndicate/driver-support)
(require syndicate/schemas/gen/tcp)
@ -19,7 +27,12 @@
(during/spawn
(Observe (:pattern (Connection ,_ (TcpInbound ,(DLit $host) ,(DLit $port)))) _)
#:name (TcpInbound host port)
(run-listener this-turn ds host port))))))
(run-listener this-turn ds host port))
(during/spawn
(Connection $local-peer (TcpOutbound $host $port))
#:name (TcpOutbound host port)
(run-outbound this-turn ds local-peer host port))))))
(define run-listener
(action (ds host port)
@ -35,76 +48,95 @@
(define connection-custodian (make-custodian))
(define-values (i o) (parameterize ((current-custodian connection-custodian))
(tcp-accept listener)))
(turn-freshen this-turn (action () (spawn-connection this-turn
ds
connection-custodian
i
o
(TcpInbound host port))))
(turn-freshen this-turn (action () (spawn-inbound this-turn
ds
connection-custodian
i
o
(TcpInbound host port))))
(loop))))))
(define spawn-connection
(define run-outbound
(action (ds local-peer host port)
(define connection-custodian (make-custodian))
((with-handlers ([exn:fail:network?
(lambda (e)
(lambda () (at local-peer (assert (ActiveSocket-close e)))))])
(define-values (i o) (parameterize ((current-custodian connection-custodian))
(tcp-connect host port)))
(lambda ()
(define name (call-with-values (lambda () (tcp-addresses i #t)) list))
(on-stop (close-input-port i)
(close-output-port o))
(start-inbound-relay this-turn connection-custodian name local-peer i)
(at local-peer
(assert (ActiveSocket-controller
(ref (entity #:name (list name 'socket)
#:message (outbound-relay name o)))))))))))
(define spawn-inbound
(action (ds custodian i o spec)
(define name (call-with-values (lambda () (tcp-addresses i #t)) list))
(spawn
#:name name
(on-stop (close-input-port i)
(close-output-port o))
(define active-controller #f)
(define active-controller-handle #f)
(define flush-pending #f)
(define start-thread
(action ()
(linked-thread
#:name (list name 'input-thread)
#:custodian custodian
this-turn
(ref (entity #:name (list name 'socket-monitor)
#:retract (action (_handle) (stop-current-facet))))
(lambda ()
(let loop ()
(define bs (read-bytes-avail i))
(when (bytes? bs)
(log-syndicate/drivers/tcp-info "inbound data ~v for ~v" bs this-actor)
(turn-freshen this-turn (action () (send! active-controller (Socket bs))))
(loop)))))))
(define active-socket
(ref (entity #:name (list name 'active-socket)
#:assert
(action (m handle)
(match (parse-ActiveSocket m)
[(ActiveSocket-controller controller)
(log-syndicate/drivers/tcp-info "~v controller for ~v" controller this-actor)
(when (not active-controller) (start-thread this-turn))
(set! active-controller controller)
(set! active-controller-handle handle)]
[(ActiveSocket-close _)
(log-syndicate/drivers/tcp-info "closing ~v" this-actor)
(stop-current-facet)]))
#:retract
(action (handle)
(log-syndicate/drivers/tcp-info "peer withdrawn ~v" this-actor)
(when (equal? handle active-controller-handle)
(stop-current-facet)))
#:message
(action (m)
(match (parse-ActiveSocket m)
[(ActiveSocket-Socket (Socket payload))
(log-syndicate/drivers/tcp-info "outbound data ~v for ~v" payload this-actor)
(write-bytes payload o)
(when (not flush-pending)
(set! flush-pending #t)
(facet-on-end-of-turn! this-facet
(action ()
(set! flush-pending #f)
(flush-output o))))])))))
(at ds
(assert (Connection active-socket spec))))))
(assert (Connection
(ref (entity #:name (list name 'active-socket)
#:assert
(action (m handle)
(match (parse-ActiveSocket m)
[(ActiveSocket-controller controller)
(log-syndicate/drivers/tcp-info "~v controller for ~v" controller this-actor)
(when (not active-controller)
(start-inbound-relay this-turn custodian name controller i))
(set! active-controller controller)
(set! active-controller-handle handle)]
[(ActiveSocket-close reason)
(log-syndicate/drivers/tcp-info "closing ~v reason ~v" this-actor reason)
(stop-current-facet)]))
#:retract
(action (handle)
(log-syndicate/drivers/tcp-info "peer withdrawn ~v" this-actor)
(when (equal? handle active-controller-handle)
(stop-current-facet)))
#:message
(outbound-relay name o)))
spec))))))
(define start-inbound-relay
(action (custodian name target i)
(linked-thread
#:name (list name 'input-thread)
#:custodian custodian
this-turn
(ref (entity #:name (list name 'socket-monitor)
#:retract (action (_handle) (stop-current-facet))))
(lambda ()
(let loop ()
(define bs (read-bytes-avail i))
(when (bytes? bs)
(log-syndicate/drivers/tcp-info "inbound data ~v for ~v" bs name)
(turn-freshen this-turn (action () (send! target (Socket bs))))
(loop)))))))
(define (outbound-relay name o)
(define flush-pending #f)
(action (m)
(match (parse-ActiveSocket m)
[(ActiveSocket-Socket (Socket payload))
(log-syndicate/drivers/tcp-info "outbound data ~v for ~v" payload name)
(write-bytes payload o)
(when (not flush-pending)
(set! flush-pending #t)
(facet-on-end-of-turn! this-facet
(action ()
(set! flush-pending #f)
(flush-output o))))])))
(define (read-bytes-avail input-port #:limit [limit 65536])
(define buffer (make-bytes limit))
@ -112,24 +144,99 @@
[(? number? count) (subbytes buffer 0 count)]
[other other]))
(define accept-connection
(action (conn #:on-data on-data-action)
(at conn
(assert (ActiveSocket-controller
(ref (entity #:name 'inbound-socket-controller
#:message
(action (m)
(match-define (Socket data) (parse-Socket m))
(on-data-action this-turn data)))))))))
(define establish-connection
(action (ds spec
#:on-connected on-connected-action
#:on-data on-data-action
#:on-disconnected [on-disconnected-action (action () (stop-current-facet))]
#:on-rejected [on-rejected-action (action () (stop-current-facet))]
)
(at ds
(assert (Connection (ref (entity #:name 'outbound-socket
#:assert
(action (m _handle)
(match (parse-ActiveSocket m)
[(ActiveSocket-controller peer)
(on-connected-action this-turn peer)]
[(ActiveSocket-close e)
(on-rejected-action this-turn e)]))
#:retract
(action (_handle) (on-disconnected-action this-turn))
#:message
(action (m)
(match (parse-ActiveSocket m)
[(ActiveSocket-Socket (Socket data))
(on-data-action this-turn data)]))))
spec)))))
(define send-data
(action (conn data)
(send! conn (Socket data))))
(module+ main
(require syndicate/drivers/timer)
(require racket/cmdline)
(define run-echo-server
(action (ds host port)
(spawn
(at ds
(during/spawn (Connection $conn (TcpInbound host port))
(accept-connection this-turn conn
#:on-data (action (data)
(match data
[#"bye\n" (stop-current-facet)]
[_ (send-data this-turn conn data)]))))))))
(define run-echo-client
(action (ds host port)
(spawn
(define-field sink #f)
(define-field counter 0)
(begin/dataflow
(when (sink)
(send! (sink) (Socket (string->bytes/utf-8 (format "~a\n" (counter)))))))
(establish-connection
this-turn ds (TcpOutbound host port)
#:on-connected
(action (peer) (sink peer))
#:on-rejected
(action (reason) (log-error "Connection failed: ~v" reason))
#:on-disconnected
(action () (log-info "Disconnected"))
#:on-data
(action (data)
(log-info "Got: ~v" data)
(counter (+ (counter) 1)))))))
(define host #f)
(define port 5999)
(define mode 'server)
(command-line #:once-each
[("--host" "-H") hostname "Set host/interface to connect to/listen on"
(set! host hostname)]
[("--port" "-p") port-number "Set port number to connect to/listen on"
(set! port (string->number port-number))]
#:once-any
["--server" "Server mode"
(set! mode 'server)]
["--client" "Client mode"
(set! mode 'client)])
(actor-system/dataspace (ds)
(spawn-timer-driver this-turn ds)
(spawn-tcp-driver this-turn ds)
(spawn
(at ds
(during/spawn (Connection $conn (TcpInbound "0.0.0.0" 5999))
(on-start (log-info "Starting service ~a" this-facet))
(on-stop (log-info "Stopping service ~a" this-facet))
(at conn
(assert (ActiveSocket-controller
(ref (entity #:message
(action (m)
(match (parse-Socket m)
[(Socket #"bye\n")
(log-info "Bye!")
(stop-current-facet)]
[(Socket data)
(log-info "Echoing ~v" data)
(send! conn (Socket data))]))))))))))))
(match mode
['server (run-echo-server this-turn ds (or host "0.0.0.0") port)]
['client (run-echo-client this-turn ds (or host "127.0.0.1") port)])))