86 lines
2.3 KiB
Racket
Executable File
86 lines
2.3 KiB
Racket
Executable File
#!/usr/bin/env racket
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#lang racket
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; vim:syntax=racket
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(require json
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"iputil.rkt"
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"unix-socket.rkt")
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;; info : Peer
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;; sock-in : Input-Port
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;; sock-out : Output-Port
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(struct peer-conn
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[info sock-in sock-out]
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#:transparent)
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;; Str [Listof Peer-Conn] -> [-> Void]
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;; --
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;; runs router logic given peer connections. returns thunk that, when called, aborts the
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;; router.
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(define (run-router/conns ans peer-conns)
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(define mail
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(make-channel))
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(define peer-threads
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(for/list ([pc (in-list peer-conns)])
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(match-define (peer-conn peer sock-in sock-out) pc)
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(thread (λ ()
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(define buf (make-bytes 65536))
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(let loop ()
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(define len (read-bytes-avail! buf sock-in))
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(printf "got ~a bytes from ~a...\n" len peer)
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(define jsexpr (bytes->jsexpr (subbytes buf 0 len)))
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(channel-put mail (list peer jsexpr))
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(loop))))))
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(define (loop)
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(match-define (list peer data) (channel-get mail))
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(printf "from ~a:\n~s\n" peer data)
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(loop))
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(printf "waiting for messages...\n")
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(loop))
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;; Str [Listof Peer] ->
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;; Router main
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(define (run-router asn peers)
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(displayln asn)
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(map displayln peers)
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(displayln "------------")
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(with-handlers ([exn:break:terminate? (λ (e)
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(printf "time to die.\n"))])
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(run-router/conns
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asn
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(for/list ([peer (in-list peers)])
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(define-values [sock-in sock-out]
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(unix-socket-connect (ip->string (peer-ip peer))
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'SOCK-SEQPACKET))
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(peer-conn peer
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sock-in
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sock-out)))))
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(module+ main
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(command-line
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#:program "router"
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#:args
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(asn . peers)
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(with-output-to-file "log.txt"
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#:exists 'replace
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(λ ()
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;; Run the router
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(run-router asn (map string->peer peers))))))
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(module+ test
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(define-values [in1 out1] (make-pipe))
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(define-values [in2 out2] (make-pipe))
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(define p1 (peer-conn (string->peer "1.2.3.4-cust") in1 out1))
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(define p2 (peer-conn (string->peer "1.2.3.5-peer") in2 out2))
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; (define abort-router
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(run-router/conns "123"
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(list p1 p2))
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(void
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(write-string "{\"a\": 1, \"b\": [1,2,3]}" out1)))
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