Asynchronous verification
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91c59988df
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133
rmq/server.rkt
133
rmq/server.rkt
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@ -47,12 +47,16 @@
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;; (notification Topic Bytes (Option String))
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(struct notification (topic-name content content-type) #:prefab)
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(struct subscription (topic-name ;; Topic
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expiry-deadline ;; Deadline
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canonical-hub ;; URLString
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callback ;; URLString
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secret ;; Option Bytes
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poll-interval-seconds) ;; Option Number
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;; (update-subscription Topic URLString (Option SubscriptionSettings))
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(struct update-subscription (topic callback settings) #:prefab) ;; message
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;; (subscription Topic URLString SubscriptionSettings)
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(struct subscription (topic callback settings-) #:prefab) ;; assertion
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(struct subscription-settings (expiry-deadline ;; Deadline
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canonical-hub ;; URLString
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secret ;; Option Bytes
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poll-interval-seconds) ;; Option Number
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#:prefab)
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;; (local-topic-config Topic (Option Number) (Option Number))
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@ -334,69 +338,51 @@
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(actor #:name 'hub
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(during (local-host $host-name)
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(on (web-request-incoming (id req) (vh host-name) 'post ("hub" ()) $body)
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;; Initially, I had an (actor* ...) form here for fault
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;; isolation. However, this led to problems since I wanted
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;; to use `assert!` and `retract!` to signal to the
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;; `during/actor`, and the assertions were being lost as
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;; the `actor*` terminated. So instead, I'm using Rackety
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;; `with-handlers`.
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(define ok?
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(with-handlers [(values (lambda (e) #f))]
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(define params (make-immutable-hash
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(form-urlencoded->alist (bytes->string/utf-8 body))))
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(define callback (hash-ref params 'hub.callback))
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(define mode
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(match (hash-ref params 'hub.mode)
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["subscribe" 'subscribe]
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["unsubscribe" 'unsubscribe]))
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(define topic (hash-ref params 'hub.topic))
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(define lease-seconds
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(match (hash-ref params 'hub.lease_seconds *default-lease*)
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["unbounded" #f]
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[n (string->number n)]))
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(define poll-interval-seconds
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(match (hash-ref params 'hub.poll_interval_seconds *default-poll-interval*)
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["none" #f]
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[n (string->number n)]))
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(define secret-string (hash-ref params 'hub.secret #f))
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(define secret-bytes (and secret-string (string->bytes/utf-8 secret-string)))
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(define expiry-deadline (and lease-seconds (+ (current-seconds) lease-seconds)))
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(define canonical-hub
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(url->string (resource->url (web-request-header-resource req))))
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;; TODO: asynchronous validation
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(match mode
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['subscribe
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(if (subscription-change-validate "subscribe"
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(or lease-seconds "unbounded")
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topic
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callback)
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(begin
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(retract! (subscription topic ? ? callback ? ?))
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(assert! (subscription topic
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expiry-deadline
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canonical-hub
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callback
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secret-bytes
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poll-interval-seconds))
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#t)
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#f)]
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['unsubscribe
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(if (subscription-change-validate "unsubscribe"
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#f
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topic
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callback)
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(begin
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(retract! (subscription topic ? ? callback ? ?))
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#t)
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#f)])))
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(if ok?
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(web-respond/status! id 202 #"Accepted")
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(web-respond/status! id 403 #"Forbidden" #"Validation failed"))))
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(asynchronous-verification-of-intent id req body)
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(web-respond/status! id 202 #"Accepted")))
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(during/actor (subscription $partial-topic _ _ $callback _ _)
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#:name (list 'subscription partial-topic callback)
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#:on-crash (retract! (subscription partial-topic ? ? callback ? ?))
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(subscription-main partial-topic callback)))
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(on (message (update-subscription $topic $callback $settings))
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(retract! (subscription topic callback ?))
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(when settings (assert! (subscription topic callback settings))))
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(during/actor (subscription $topic $callback _)
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#:name (list 'subscription topic callback)
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#:on-crash (retract! (subscription topic callback ?))
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(subscription-main topic callback)))
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(define (asynchronous-verification-of-intent id req body)
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(actor* (define params (make-immutable-hash (form-urlencoded->alist (bytes->string/utf-8 body))))
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(define callback (hash-ref params 'hub.callback))
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(define mode (match (hash-ref params 'hub.mode)
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["subscribe" 'subscribe]
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["unsubscribe" 'unsubscribe]))
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(define topic (hash-ref params 'hub.topic))
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(define lease-seconds (match (hash-ref params 'hub.lease_seconds *default-lease*)
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["unbounded" #f]
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[n (string->number n)]))
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(define poll-interval-seconds
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(match (hash-ref params 'hub.poll_interval_seconds *default-poll-interval*)
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["none" #f]
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[n (string->number n)]))
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(define secret-string (hash-ref params 'hub.secret #f))
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(define secret-bytes (and secret-string (string->bytes/utf-8 secret-string)))
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(define expiry-deadline (and lease-seconds (+ (current-seconds) lease-seconds)))
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(define canonical-hub (url->string (resource->url (web-request-header-resource req))))
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(match mode
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['subscribe
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(when (subscription-change-validate "subscribe"
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(or lease-seconds "unbounded")
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topic
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callback)
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(send! (update-subscription topic
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callback
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(subscription-settings expiry-deadline
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canonical-hub
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secret-bytes
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poll-interval-seconds))))]
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['unsubscribe
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(when (subscription-change-validate "unsubscribe" #f topic callback)
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(send! (update-subscription topic callback #f)))])))
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(define (subscription-change-validate mode lease topic callback)
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(define challenge (random-hex-string 16))
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@ -461,12 +447,11 @@
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*max-retry-delay*))]))))
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(delivery-active? #f))
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(during (subscription partial-topic
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$expiry-deadline
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$canonical-hub
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callback
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$secret-bytes
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$poll-interval-seconds)
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(during (subscription partial-topic callback (subscription-settings
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$expiry-deadline
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$canonical-hub
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$secret-bytes
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$poll-interval-seconds))
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(define topic (url->string (combine-url/relative (canonical-topic-base-url canonical-hub)
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partial-topic)))
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