62 lines
1.8 KiB
OCaml
62 lines
1.8 KiB
OCaml
open Unix
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open Printf
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open Thread
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open Sexp
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let send_error ch message details =
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let m = Message.error (Str message, details) in
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Log.warn "Sending error" [m];
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ch m
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let send_sexp_syntax_error ch explanation =
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send_error ch explanation (Str "http://people.csail.mit.edu/rivest/Sexp.txt")
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let dispatch_message n ch m =
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match m with
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| Message.Post (Str name, body, token) ->
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Node.send_ignore name body
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| Message.Subscribe (Str filter, sink, name, Str reply_sink, Str reply_name) ->
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if Node.bind(filter, n)
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then Node.post_ignore
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reply_sink
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(Str reply_name)
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(Message.subscribe_ok (Str filter))
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(Str "")
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else Log.warn "Bind failed" [Str filter]
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| Message.Unsubscribe (Str token) ->
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if Node.unbind token
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then ()
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else Log.warn "Unbind failed" [Str token]
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| _ ->
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send_error ch "Message not understood" (Message.sexp_of_message m)
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let issue_banner cin cout =
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output_sexp_and_flush cout (Arr [Str "hop"; Str ""]);
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output_sexp_and_flush cout
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(Message.subscribe (Str (Node.local_container_name()),
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Str "", Str "",
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Str "", Str ""));
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true
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let relay_boot (peername, mtx, cin, cout) = (peername, mtx, cin, cout)
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let relay_handler (_, mtx, _, cout) _ m =
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Util.with_mutex mtx (output_sexp_and_flush cout) m
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let relay_mainloop (peername, mtx, cin, cout) n =
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let write_sexp = Util.with_mutex mtx (output_sexp cout) in
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(try
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while true do
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dispatch_message n write_sexp (Message.message_of_sexp (Sexp.input_sexp cin))
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done
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with
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| Sexp.Syntax_error explanation ->
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(send_sexp_syntax_error write_sexp explanation;
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Log.info "Disconnected relay for syntax error"
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[Str (Connections.endpoint_name peername); Str explanation])
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)
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let start (s, peername) =
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Connections.start_connection "relay" issue_banner
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relay_boot relay_handler relay_mainloop (s, peername)
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