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Merge pull request #49 from rabbitmq/rabbitmq-server-559
Update channel interceptors on register/unregister
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| %% The contents of this file are subject to the Mozilla Public License | ||
| %% Version 1.1 (the "License"); you may not use this file except in | ||
| %% compliance with the License. You may obtain a copy of the License | ||
| %% at http://www.mozilla.org/MPL/ | ||
| %% | ||
| %% Software distributed under the License is distributed on an "AS IS" | ||
| %% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See | ||
| %% the License for the specific language governing rights and | ||
| %% limitations under the License. | ||
| %% | ||
| %% The Original Code is RabbitMQ. | ||
| %% | ||
| %% The Initial Developer of the Original Code is GoPivotal, Inc. | ||
| %% Copyright (c) 2007-2016 Pivotal Software, Inc. All rights reserved. | ||
| %% | ||
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| -module(rabbit_registry). | ||
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| -behaviour(gen_server). | ||
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| -export([start_link/0]). | ||
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| -export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, | ||
| code_change/3]). | ||
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| -export([register/3, unregister/2, | ||
| binary_to_type/1, lookup_module/2, lookup_all/1]). | ||
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| -define(SERVER, ?MODULE). | ||
| -define(ETS_NAME, ?MODULE). | ||
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| -ifdef(use_specs). | ||
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| -spec(start_link/0 :: () -> rabbit_types:ok_pid_or_error()). | ||
| -spec(register/3 :: (atom(), binary(), atom()) -> 'ok'). | ||
| -spec(unregister/2 :: (atom(), binary()) -> 'ok'). | ||
| -spec(binary_to_type/1 :: | ||
| (binary()) -> atom() | rabbit_types:error('not_found')). | ||
| -spec(lookup_module/2 :: | ||
| (atom(), atom()) -> rabbit_types:ok_or_error2(atom(), 'not_found')). | ||
| -spec(lookup_all/1 :: (atom()) -> [{atom(), atom()}]). | ||
|
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| -endif. | ||
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| %%--------------------------------------------------------------------------- | ||
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| start_link() -> | ||
| gen_server:start_link({local, ?SERVER}, ?MODULE, [], []). | ||
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| %%--------------------------------------------------------------------------- | ||
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| register(Class, TypeName, ModuleName) -> | ||
| gen_server:call(?SERVER, {register, Class, TypeName, ModuleName}, infinity). | ||
|
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| unregister(Class, TypeName) -> | ||
| gen_server:call(?SERVER, {unregister, Class, TypeName}, infinity). | ||
|
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| %% This is used with user-supplied arguments (e.g., on exchange | ||
| %% declare), so we restrict it to existing atoms only. This means it | ||
| %% can throw a badarg, indicating that the type cannot have been | ||
| %% registered. | ||
| binary_to_type(TypeBin) when is_binary(TypeBin) -> | ||
| case catch list_to_existing_atom(binary_to_list(TypeBin)) of | ||
| {'EXIT', {badarg, _}} -> {error, not_found}; | ||
| TypeAtom -> TypeAtom | ||
| end. | ||
|
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| lookup_module(Class, T) when is_atom(T) -> | ||
| case ets:lookup(?ETS_NAME, {Class, T}) of | ||
| [{_, Module}] -> | ||
| {ok, Module}; | ||
| [] -> | ||
| {error, not_found} | ||
| end. | ||
|
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| lookup_all(Class) -> | ||
| [{K, V} || [K, V] <- ets:match(?ETS_NAME, {{Class, '$1'}, '$2'})]. | ||
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| %%--------------------------------------------------------------------------- | ||
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| internal_binary_to_type(TypeBin) when is_binary(TypeBin) -> | ||
| list_to_atom(binary_to_list(TypeBin)). | ||
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| internal_register(Class, TypeName, ModuleName) | ||
| when is_atom(Class), is_binary(TypeName), is_atom(ModuleName) -> | ||
| ClassModule = class_module(Class), | ||
| Type = internal_binary_to_type(TypeName), | ||
| RegArg = {{Class, Type}, ModuleName}, | ||
| ok = sanity_check_module(ClassModule, ModuleName), | ||
| true = ets:insert(?ETS_NAME, RegArg), | ||
| conditional_register(RegArg), | ||
| ok = ClassModule:added_to_rabbit_registry(Type, ModuleName), | ||
| ok. | ||
|
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| internal_unregister(Class, TypeName) -> | ||
| ClassModule = class_module(Class), | ||
| Type = internal_binary_to_type(TypeName), | ||
| UnregArg = {Class, Type}, | ||
| conditional_unregister(UnregArg), | ||
| true = ets:delete(?ETS_NAME, UnregArg), | ||
| ok = ClassModule:removed_from_rabbit_registry(Type), | ||
| ok. | ||
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| %% register exchange decorator route callback only when implemented, | ||
| %% in order to avoid unnecessary decorator calls on the fast | ||
| %% publishing path | ||
| conditional_register({{exchange_decorator, Type}, ModuleName}) -> | ||
| case erlang:function_exported(ModuleName, route, 2) of | ||
| true -> true = ets:insert(?ETS_NAME, | ||
| {{exchange_decorator_route, Type}, | ||
| ModuleName}); | ||
| false -> ok | ||
| end; | ||
| conditional_register(_) -> | ||
| ok. | ||
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| conditional_unregister({exchange_decorator, Type}) -> | ||
| true = ets:delete(?ETS_NAME, {exchange_decorator_route, Type}), | ||
| ok; | ||
| conditional_unregister(_) -> | ||
| ok. | ||
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| sanity_check_module(ClassModule, Module) -> | ||
| case catch lists:member(ClassModule, | ||
| lists:flatten( | ||
| [Bs || {Attr, Bs} <- | ||
| Module:module_info(attributes), | ||
| Attr =:= behavior orelse | ||
| Attr =:= behaviour])) of | ||
| {'EXIT', {undef, _}} -> {error, not_module}; | ||
| false -> {error, {not_type, ClassModule}}; | ||
| true -> ok | ||
| end. | ||
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| % Registry class modules. There should exist module for each registry class. | ||
| % Class module should be behaviour (export behaviour_info/1) and implement | ||
| % rabbit_registry_class behaviour itself: export added_to_rabbit_registry/2 | ||
| % and removed_from_rabbit_registry/1 functions. | ||
| class_module(exchange) -> rabbit_exchange_type; | ||
| class_module(auth_mechanism) -> rabbit_auth_mechanism; | ||
| class_module(runtime_parameter) -> rabbit_runtime_parameter; | ||
| class_module(exchange_decorator) -> rabbit_exchange_decorator; | ||
| class_module(queue_decorator) -> rabbit_queue_decorator; | ||
| class_module(policy_validator) -> rabbit_policy_validator; | ||
| class_module(ha_mode) -> rabbit_mirror_queue_mode; | ||
| class_module(channel_interceptor) -> rabbit_channel_interceptor; | ||
| class_module(queue_master_locator)-> rabbit_queue_master_locator. | ||
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| %%--------------------------------------------------------------------------- | ||
|
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| init([]) -> | ||
| ?ETS_NAME = ets:new(?ETS_NAME, [protected, set, named_table]), | ||
| {ok, none}. | ||
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| handle_call({register, Class, TypeName, ModuleName}, _From, State) -> | ||
| ok = internal_register(Class, TypeName, ModuleName), | ||
| {reply, ok, State}; | ||
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| handle_call({unregister, Class, TypeName}, _From, State) -> | ||
| ok = internal_unregister(Class, TypeName), | ||
| {reply, ok, State}; | ||
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| handle_call(Request, _From, State) -> | ||
| {stop, {unhandled_call, Request}, State}. | ||
|
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| handle_cast(Request, State) -> | ||
| {stop, {unhandled_cast, Request}, State}. | ||
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| handle_info(Message, State) -> | ||
| {stop, {unhandled_info, Message}, State}. | ||
|
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| terminate(_Reason, _State) -> | ||
| ok. | ||
|
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| code_change(_OldVsn, State, _Extra) -> | ||
| {ok, State}. |
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