95 lines
3.3 KiB
OCaml
95 lines
3.3 KiB
OCaml
(* Copyright 2012 Tony Garnock-Jones <tonygarnockjones@gmail.com>. *)
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(* This file is part of Hop. *)
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(* Hop is free software: you can redistribute it and/or modify it *)
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(* under the terms of the GNU General Public License as published by the *)
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(* Free Software Foundation, either version 3 of the License, or (at your *)
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(* option) any later version. *)
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(* Hop is distributed in the hope that it will be useful, but *)
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(* WITHOUT ANY WARRANTY; without even the implied warranty of *)
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(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *)
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(* General Public License for more details. *)
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(* You should have received a copy of the GNU General Public License *)
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(* along with Hop. If not, see <http://www.gnu.org/licenses/>. *)
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open Lwt
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open Sexp
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open Datastructures
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open Status
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type t = {
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name: Node.name;
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subscriptions: Subscription.set_t;
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mutable routing_table: UuidSet.t BytesMap.t;
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}
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let classname = "direct"
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let unsubscribe info uuid =
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match_lwt Subscription.delete info.name info.subscriptions (Bytes.of_string uuid) with
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| Some sub ->
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(match sub.Subscription.filter with
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| Str binding_key ->
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(try
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let old_set = BytesMap.find binding_key info.routing_table in
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let new_set = UuidSet.remove (Bytes.of_string sub.Subscription.uuid) old_set in
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if UuidSet.is_empty new_set
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then info.routing_table <- BytesMap.remove binding_key info.routing_table
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else info.routing_table <- BytesMap.add binding_key new_set info.routing_table
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with Not_found ->
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());
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return ()
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| _ -> return ())
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| None -> return ()
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let route_message info n sexp =
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match Message.message_of_sexp sexp with
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| Message.Post (Str name, body, token) ->
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let routing_snapshot = info.routing_table in
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let matching = (try BytesMap.find name routing_snapshot with Not_found -> UuidSet.empty) in
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Lwt_list.iter_s
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(fun (uuid) ->
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match Subscription.lookup info.subscriptions uuid with
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| Some sub ->
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lwt _ = Subscription.send_to_subscription' sub body (unsubscribe info) in
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return ()
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| None ->
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return ())
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(UuidSet.elements matching)
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| Message.Subscribe (Str binding_key as filter, Str sink, name, Str reply_sink, reply_name) ->
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(match_lwt
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Subscription.create info.name info.subscriptions filter sink name reply_sink reply_name
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with
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| Subscription.New sub ->
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let old_set =
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(try BytesMap.find binding_key info.routing_table with Not_found -> UuidSet.empty) in
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let new_set = UuidSet.add (Bytes.of_string sub.Subscription.uuid) old_set in
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info.routing_table <- BytesMap.add binding_key new_set info.routing_table;
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return ()
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| Subscription.Old sub ->
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return ())
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| Message.Unsubscribe (Str token) ->
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unsubscribe info (Bytes.to_string token)
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| m ->
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Util.message_not_understood classname m
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let factory arg =
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match arg with
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| (Arr [Str name_str]) ->
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let info = {
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name = Node.name_of_bytes name_str;
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subscriptions = Subscription.new_set ();
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routing_table = BytesMap.empty;
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} in
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replace_ok
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(Node.make_idempotent_named (Bytes.of_string classname) info.name return (route_message info))
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(Str name_str)
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| _ ->
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return (Problem (litstr "bad-arg"))
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let init () =
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Factory.register_class (Bytes.of_string classname) factory
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