Time out TCP relay process if peers don't show up
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parent
c4b14b3331
commit
7456e2efec
46
tcp.rkt
46
tcp.rkt
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@ -109,28 +109,36 @@
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Relay between kernel-level and user-level
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(define relay-peer-wait-time-msec 5000)
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(define ((spawn-relay local-user-addr) remote-addr local-tcp-addr)
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(define timer-name (list 'spawn-relay local-tcp-addr remote-addr))
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(define local-peer-traffic (pub (tcp-channel remote-addr local-user-addr ?) #:level 1))
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(define remote-peer-traffic (sub (tcp-channel remote-addr local-tcp-addr ?) #:level 1))
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(spawn (lambda (e state)
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(match e
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[(routing-update g)
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(define local-peer-absent? (gestalt-empty? (gestalt-filter g local-peer-traffic)))
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(define remote-peer-absent? (gestalt-empty? (gestalt-filter g remote-peer-traffic)))
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(define new-state (+ (if local-peer-absent? 0 1) (if remote-peer-absent? 0 1)))
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(transition new-state (when (< new-state state) (quit)))]
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[(message (tcp-channel (== local-user-addr) (== remote-addr) bs) _ _)
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(transition state (send (tcp-channel local-tcp-addr remote-addr bs)))]
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[(message (tcp-channel (== remote-addr) (== local-tcp-addr) bs) _ _)
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(transition state (send (tcp-channel remote-addr local-user-addr bs)))]
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[_ #f]))
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0
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(gestalt-union local-peer-traffic
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remote-peer-traffic
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(sub (tcp-channel remote-addr local-tcp-addr ?))
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(sub (tcp-channel local-user-addr remote-addr ?))
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(pub (tcp-channel remote-addr local-user-addr ?))
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(pub (tcp-channel local-tcp-addr remote-addr ?)))))
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(list
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(send (set-timer timer-name relay-peer-wait-time-msec 'relative))
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(spawn (lambda (e state)
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(match e
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[(routing-update g)
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(define local-peer-absent? (gestalt-empty? (gestalt-filter g local-peer-traffic)))
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(define remote-peer-absent? (gestalt-empty? (gestalt-filter g remote-peer-traffic)))
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(define new-state (+ (if local-peer-absent? 0 1) (if remote-peer-absent? 0 1)))
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(transition new-state (when (< new-state state) (quit)))]
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[(message (tcp-channel (== local-user-addr) (== remote-addr) bs) _ _)
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(transition state (send (tcp-channel local-tcp-addr remote-addr bs)))]
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[(message (tcp-channel (== remote-addr) (== local-tcp-addr) bs) _ _)
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(transition state (send (tcp-channel remote-addr local-user-addr bs)))]
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[(message (timer-expired _ _) _ _)
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(error 'spawn-relay "TCP relay process timed out waiting for peer")]
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[_ #f]))
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0
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(gestalt-union local-peer-traffic
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remote-peer-traffic
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(sub (tcp-channel remote-addr local-tcp-addr ?))
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(sub (tcp-channel local-user-addr remote-addr ?))
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(pub (tcp-channel remote-addr local-user-addr ?))
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(pub (tcp-channel local-tcp-addr remote-addr ?))
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(sub (timer-expired timer-name ?))))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Codec & kernel-level driver
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