%% This Source Code Form is subject to the terms of the Mozilla Public %% License, v. 2.0. If a copy of the MPL was not distributed with this %% file, You can obtain one at https://mozilla.org/MPL/2.0/. %% %% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved. %% -module(rabbit_upgrade_functions). %% If you are tempted to add include("rabbit.hrl"). here, don't. Using record %% defs here leads to pain later. -compile([nowarn_export_all, export_all]). -rabbit_upgrade({remove_user_scope, mnesia, []}). -rabbit_upgrade({hash_passwords, mnesia, []}). -rabbit_upgrade({add_ip_to_listener, mnesia, []}). -rabbit_upgrade({add_opts_to_listener, mnesia, [add_ip_to_listener]}). -rabbit_upgrade({internal_exchanges, mnesia, []}). -rabbit_upgrade({user_to_internal_user, mnesia, [hash_passwords]}). -rabbit_upgrade({topic_trie, mnesia, []}). -rabbit_upgrade({semi_durable_route, mnesia, []}). -rabbit_upgrade({exchange_event_serial, mnesia, []}). -rabbit_upgrade({trace_exchanges, mnesia, [internal_exchanges]}). -rabbit_upgrade({user_admin_to_tags, mnesia, [user_to_internal_user]}). -rabbit_upgrade({ha_mirrors, mnesia, []}). -rabbit_upgrade({gm, mnesia, []}). -rabbit_upgrade({exchange_scratch, mnesia, [trace_exchanges]}). -rabbit_upgrade({mirrored_supervisor, mnesia, []}). -rabbit_upgrade({topic_trie_node, mnesia, []}). -rabbit_upgrade({runtime_parameters, mnesia, []}). -rabbit_upgrade({exchange_scratches, mnesia, [exchange_scratch]}). -rabbit_upgrade({policy, mnesia, [exchange_scratches, ha_mirrors]}). -rabbit_upgrade({sync_slave_pids, mnesia, [policy]}). -rabbit_upgrade({no_mirror_nodes, mnesia, [sync_slave_pids]}). -rabbit_upgrade({gm_pids, mnesia, [no_mirror_nodes]}). -rabbit_upgrade({exchange_decorators, mnesia, [policy]}). -rabbit_upgrade({policy_apply_to, mnesia, [runtime_parameters]}). -rabbit_upgrade({queue_decorators, mnesia, [gm_pids]}). -rabbit_upgrade({internal_system_x, mnesia, [exchange_decorators]}). -rabbit_upgrade({cluster_name, mnesia, [runtime_parameters]}). -rabbit_upgrade({down_slave_nodes, mnesia, [queue_decorators]}). -rabbit_upgrade({queue_state, mnesia, [down_slave_nodes]}). -rabbit_upgrade({recoverable_slaves, mnesia, [queue_state]}). -rabbit_upgrade({policy_version, mnesia, [recoverable_slaves]}). -rabbit_upgrade({slave_pids_pending_shutdown, mnesia, [policy_version]}). -rabbit_upgrade({user_password_hashing, mnesia, [hash_passwords]}). -rabbit_upgrade({operator_policies, mnesia, [slave_pids_pending_shutdown, internal_system_x]}). -rabbit_upgrade({vhost_limits, mnesia, []}). -rabbit_upgrade({queue_vhost_field, mnesia, [operator_policies]}). -rabbit_upgrade({topic_permission, mnesia, []}). -rabbit_upgrade({queue_options, mnesia, [queue_vhost_field]}). -rabbit_upgrade({exchange_options, mnesia, [operator_policies]}). %% ------------------------------------------------------------------- %% replaces vhost.dummy (used to avoid having a single-field record %% which Mnesia doesn't like) with vhost.limits (which is actually %% used) -spec vhost_limits() -> 'ok'. vhost_limits() -> transform( rabbit_vhost, fun ({vhost, VHost, _Dummy}) -> {vhost, VHost, undefined} end, [virtual_host, limits]). %% It's a bad idea to use records or record_info here, even for the %% destination form. Because in the future, the destination form of %% your current transform may not match the record any more, and it %% would be messy to have to go back and fix old transforms at that %% point. -spec remove_user_scope() -> 'ok'. remove_user_scope() -> transform( rabbit_user_permission, fun ({user_permission, UV, {permission, _Scope, Conf, Write, Read}}) -> {user_permission, UV, {permission, Conf, Write, Read}} end, [user_vhost, permission]). %% this is an early migration that hashes passwords using MD5, %% only relevant to those migrating from 2.1.1. %% all users created after in 3.6.0 or later will use SHA-256 (unless configured %% otherwise) -spec hash_passwords() -> 'ok'. hash_passwords() -> transform( rabbit_user, fun ({user, Username, Password, IsAdmin}) -> Hash = rabbit_auth_backend_internal:hash_password(rabbit_password_hashing_md5, Password), {user, Username, Hash, IsAdmin} end, [username, password_hash, is_admin]). -spec add_ip_to_listener() -> 'ok'. add_ip_to_listener() -> transform( rabbit_listener, fun ({listener, Node, Protocol, Host, Port}) -> {listener, Node, Protocol, Host, {0,0,0,0}, Port} end, [node, protocol, host, ip_address, port]). -spec add_opts_to_listener() -> 'ok'. add_opts_to_listener() -> transform( rabbit_listener, fun ({listener, Node, Protocol, Host, IP, Port}) -> {listener, Node, Protocol, Host, IP, Port, []} end, [node, protocol, host, ip_address, port, opts]). -spec internal_exchanges() -> 'ok'. internal_exchanges() -> Tables = [rabbit_exchange, rabbit_durable_exchange], AddInternalFun = fun ({exchange, Name, Type, Durable, AutoDelete, Args}) -> {exchange, Name, Type, Durable, AutoDelete, false, Args} end, [ ok = transform(T, AddInternalFun, [name, type, durable, auto_delete, internal, arguments]) || T <- Tables ], ok. -spec user_to_internal_user() -> 'ok'. user_to_internal_user() -> transform( rabbit_user, fun({user, Username, PasswordHash, IsAdmin}) -> {internal_user, Username, PasswordHash, IsAdmin} end, [username, password_hash, is_admin], internal_user). -spec topic_trie() -> 'ok'. topic_trie() -> create(rabbit_topic_trie_edge, [{record_name, topic_trie_edge}, {attributes, [trie_edge, node_id]}, {type, ordered_set}]), create(rabbit_topic_trie_binding, [{record_name, topic_trie_binding}, {attributes, [trie_binding, value]}, {type, ordered_set}]). -spec semi_durable_route() -> 'ok'. semi_durable_route() -> create(rabbit_semi_durable_route, [{record_name, route}, {attributes, [binding, value]}]). -spec exchange_event_serial() -> 'ok'. exchange_event_serial() -> create(rabbit_exchange_serial, [{record_name, exchange_serial}, {attributes, [name, next]}]). -spec trace_exchanges() -> 'ok'. trace_exchanges() -> [declare_exchange( rabbit_misc:r(VHost, exchange, <<"amq.rabbitmq.trace">>), topic) || VHost <- rabbit_vhost:list_names()], ok. -spec user_admin_to_tags() -> 'ok'. user_admin_to_tags() -> transform( rabbit_user, fun({internal_user, Username, PasswordHash, true}) -> {internal_user, Username, PasswordHash, [administrator]}; ({internal_user, Username, PasswordHash, false}) -> {internal_user, Username, PasswordHash, [management]} end, [username, password_hash, tags], internal_user). -spec ha_mirrors() -> 'ok'. ha_mirrors() -> Tables = [rabbit_queue, rabbit_durable_queue], AddMirrorPidsFun = fun ({amqqueue, Name, Durable, AutoDelete, Owner, Arguments, Pid}) -> {amqqueue, Name, Durable, AutoDelete, Owner, Arguments, Pid, [], undefined} end, [ ok = transform(T, AddMirrorPidsFun, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, mirror_nodes]) || T <- Tables ], ok. -spec gm() -> 'ok'. gm() -> create(gm_group, [{record_name, gm_group}, {attributes, [name, version, members]}]). -spec exchange_scratch() -> 'ok'. exchange_scratch() -> ok = exchange_scratch(rabbit_exchange), ok = exchange_scratch(rabbit_durable_exchange). exchange_scratch(Table) -> transform( Table, fun ({exchange, Name, Type, Dur, AutoDel, Int, Args}) -> {exchange, Name, Type, Dur, AutoDel, Int, Args, undefined} end, [name, type, durable, auto_delete, internal, arguments, scratch]). -spec mirrored_supervisor() -> 'ok'. mirrored_supervisor() -> create(mirrored_sup_childspec, [{record_name, mirrored_sup_childspec}, {attributes, [key, mirroring_pid, childspec]}]). -spec topic_trie_node() -> 'ok'. topic_trie_node() -> create(rabbit_topic_trie_node, [{record_name, topic_trie_node}, {attributes, [trie_node, edge_count, binding_count]}, {type, ordered_set}]). -spec runtime_parameters() -> 'ok'. runtime_parameters() -> create(rabbit_runtime_parameters, [{record_name, runtime_parameters}, {attributes, [key, value]}, {disc_copies, [node()]}]). exchange_scratches() -> ok = exchange_scratches(rabbit_exchange), ok = exchange_scratches(rabbit_durable_exchange). exchange_scratches(Table) -> transform( Table, fun ({exchange, Name, Type = <<"x-federation">>, Dur, AutoDel, Int, Args, Scratch}) -> Scratches = orddict:store(federation, Scratch, orddict:new()), {exchange, Name, Type, Dur, AutoDel, Int, Args, Scratches}; %% We assert here that nothing else uses the scratch mechanism ATM ({exchange, Name, Type, Dur, AutoDel, Int, Args, undefined}) -> {exchange, Name, Type, Dur, AutoDel, Int, Args, undefined} end, [name, type, durable, auto_delete, internal, arguments, scratches]). -spec policy() -> 'ok'. policy() -> ok = exchange_policy(rabbit_exchange), ok = exchange_policy(rabbit_durable_exchange), ok = queue_policy(rabbit_queue), ok = queue_policy(rabbit_durable_queue). exchange_policy(Table) -> transform( Table, fun ({exchange, Name, Type, Dur, AutoDel, Int, Args, Scratches}) -> {exchange, Name, Type, Dur, AutoDel, Int, Args, Scratches, undefined} end, [name, type, durable, auto_delete, internal, arguments, scratches, policy]). queue_policy(Table) -> transform( Table, fun ({amqqueue, Name, Dur, AutoDel, Excl, Args, Pid, SPids, MNodes}) -> {amqqueue, Name, Dur, AutoDel, Excl, Args, Pid, SPids, MNodes, undefined} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, mirror_nodes, policy]). -spec sync_slave_pids() -> 'ok'. sync_slave_pids() -> Tables = [rabbit_queue, rabbit_durable_queue], AddSyncSlavesFun = fun ({amqqueue, N, D, AD, Excl, Args, Pid, SPids, MNodes, Pol}) -> {amqqueue, N, D, AD, Excl, Args, Pid, SPids, [], MNodes, Pol} end, [ok = transform(T, AddSyncSlavesFun, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, mirror_nodes, policy]) || T <- Tables], ok. -spec no_mirror_nodes() -> 'ok'. no_mirror_nodes() -> Tables = [rabbit_queue, rabbit_durable_queue], RemoveMirrorNodesFun = fun ({amqqueue, N, D, AD, O, A, Pid, SPids, SSPids, _MNodes, Pol}) -> {amqqueue, N, D, AD, O, A, Pid, SPids, SSPids, Pol} end, [ok = transform(T, RemoveMirrorNodesFun, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, policy]) || T <- Tables], ok. -spec gm_pids() -> 'ok'. gm_pids() -> Tables = [rabbit_queue, rabbit_durable_queue], AddGMPidsFun = fun ({amqqueue, N, D, AD, O, A, Pid, SPids, SSPids, Pol}) -> {amqqueue, N, D, AD, O, A, Pid, SPids, SSPids, Pol, []} end, [ok = transform(T, AddGMPidsFun, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, policy, gm_pids]) || T <- Tables], ok. -spec exchange_decorators() -> 'ok'. exchange_decorators() -> ok = exchange_decorators(rabbit_exchange), ok = exchange_decorators(rabbit_durable_exchange). exchange_decorators(Table) -> transform( Table, fun ({exchange, Name, Type, Dur, AutoDel, Int, Args, Scratches, Policy}) -> {exchange, Name, Type, Dur, AutoDel, Int, Args, Scratches, Policy, {[], []}} end, [name, type, durable, auto_delete, internal, arguments, scratches, policy, decorators]). -spec policy_apply_to() -> 'ok'. policy_apply_to() -> transform( rabbit_runtime_parameters, fun ({runtime_parameters, Key = {_VHost, <<"policy">>, _Name}, Value}) -> ApplyTo = apply_to(proplists:get_value(<<"definition">>, Value)), {runtime_parameters, Key, [{<<"apply-to">>, ApplyTo} | Value]}; ({runtime_parameters, Key, Value}) -> {runtime_parameters, Key, Value} end, [key, value]), rabbit_policy:invalidate(), ok. apply_to(Def) -> case [proplists:get_value(K, Def) || K <- [<<"federation-upstream-set">>, <<"ha-mode">>]] of [undefined, undefined] -> <<"all">>; [_, undefined] -> <<"exchanges">>; [undefined, _] -> <<"queues">>; [_, _] -> <<"all">> end. -spec queue_decorators() -> 'ok'. queue_decorators() -> ok = queue_decorators(rabbit_queue), ok = queue_decorators(rabbit_durable_queue). queue_decorators(Table) -> transform( Table, fun ({amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, Policy, GmPids}) -> {amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, Policy, GmPids, []} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, policy, gm_pids, decorators]). -spec internal_system_x() -> 'ok'. internal_system_x() -> transform( rabbit_durable_exchange, fun ({exchange, Name = {resource, _, _, <<"amq.rabbitmq.", _/binary>>}, Type, Dur, AutoDel, _Int, Args, Scratches, Policy, Decorators}) -> {exchange, Name, Type, Dur, AutoDel, true, Args, Scratches, Policy, Decorators}; (X) -> X end, [name, type, durable, auto_delete, internal, arguments, scratches, policy, decorators]). -spec cluster_name() -> 'ok'. cluster_name() -> {atomic, ok} = mnesia:transaction(fun cluster_name_tx/0), ok. cluster_name_tx() -> %% mnesia:transform_table/4 does not let us delete records T = rabbit_runtime_parameters, mnesia:write_lock_table(T), Ks = [K || {_VHost, <<"federation">>, <<"local-nodename">>} = K <- mnesia:all_keys(T)], case Ks of [] -> ok; [K|Tl] -> [{runtime_parameters, _K, Name}] = mnesia:read(T, K, write), R = {runtime_parameters, cluster_name, Name}, mnesia:write(T, R, write), case Tl of [] -> ok; _ -> {VHost, _, _} = K, error_logger:warning_msg( "Multiple local-nodenames found, picking '~s' " "from '~s' for cluster name~n", [Name, VHost]) end end, [mnesia:delete(T, K, write) || K <- Ks], ok. -spec down_slave_nodes() -> 'ok'. down_slave_nodes() -> ok = down_slave_nodes(rabbit_queue), ok = down_slave_nodes(rabbit_durable_queue). down_slave_nodes(Table) -> transform( Table, fun ({amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, Policy, GmPids, Decorators}) -> {amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, [], Policy, GmPids, Decorators} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, down_slave_nodes, policy, gm_pids, decorators]). -spec queue_state() -> 'ok'. queue_state() -> ok = queue_state(rabbit_queue), ok = queue_state(rabbit_durable_queue). queue_state(Table) -> transform( Table, fun ({amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, GmPids, Decorators}) -> {amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, GmPids, Decorators, live} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, down_slave_nodes, policy, gm_pids, decorators, state]). -spec recoverable_slaves() -> 'ok'. recoverable_slaves() -> ok = recoverable_slaves(rabbit_queue), ok = recoverable_slaves(rabbit_durable_queue). recoverable_slaves(Table) -> transform( Table, fun (Q) -> Q end, %% Don't change shape of record [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, recoverable_slaves, policy, gm_pids, decorators, state]). policy_version() -> ok = policy_version(rabbit_queue), ok = policy_version(rabbit_durable_queue). policy_version(Table) -> transform( Table, fun ({amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, GmPids, Decorators, State}) -> {amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, GmPids, Decorators, State, 0} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, recoverable_slaves, policy, gm_pids, decorators, state, policy_version]). slave_pids_pending_shutdown() -> ok = slave_pids_pending_shutdown(rabbit_queue), ok = slave_pids_pending_shutdown(rabbit_durable_queue). slave_pids_pending_shutdown(Table) -> transform( Table, fun ({amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, GmPids, Decorators, State, PolicyVersion}) -> {amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, GmPids, Decorators, State, PolicyVersion, []} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, recoverable_slaves, policy, gm_pids, decorators, state, policy_version, slave_pids_pending_shutdown]). -spec operator_policies() -> 'ok'. operator_policies() -> ok = exchange_operator_policies(rabbit_exchange), ok = exchange_operator_policies(rabbit_durable_exchange), ok = queue_operator_policies(rabbit_queue), ok = queue_operator_policies(rabbit_durable_queue). exchange_operator_policies(Table) -> transform( Table, fun ({exchange, Name, Type, Dur, AutoDel, Internal, Args, Scratches, Policy, Decorators}) -> {exchange, Name, Type, Dur, AutoDel, Internal, Args, Scratches, Policy, undefined, Decorators} end, [name, type, durable, auto_delete, internal, arguments, scratches, policy, operator_policy, decorators]). queue_operator_policies(Table) -> transform( Table, fun ({amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, GmPids, Decorators, State, PolicyVersion, SlavePidsPendingShutdown}) -> {amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, undefined, GmPids, Decorators, State, PolicyVersion, SlavePidsPendingShutdown} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, recoverable_slaves, policy, operator_policy, gm_pids, decorators, state, policy_version, slave_pids_pending_shutdown]). -spec queue_vhost_field() -> 'ok'. queue_vhost_field() -> ok = queue_vhost_field(rabbit_queue), ok = queue_vhost_field(rabbit_durable_queue), {atomic, ok} = mnesia:add_table_index(rabbit_queue, vhost), {atomic, ok} = mnesia:add_table_index(rabbit_durable_queue, vhost), ok. queue_vhost_field(Table) -> transform( Table, fun ({amqqueue, Name = {resource, VHost, queue, _QName}, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, OperatorPolicy, GmPids, Decorators, State, PolicyVersion, SlavePidsPendingShutdown}) -> {amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, OperatorPolicy, GmPids, Decorators, State, PolicyVersion, SlavePidsPendingShutdown, VHost} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, recoverable_slaves, policy, operator_policy, gm_pids, decorators, state, policy_version, slave_pids_pending_shutdown, vhost]). -spec queue_options() -> 'ok'. queue_options() -> ok = queue_options(rabbit_queue), ok = queue_options(rabbit_durable_queue), ok. queue_options(Table) -> transform( Table, fun ({amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, OperatorPolicy, GmPids, Decorators, State, PolicyVersion, SlavePidsPendingShutdown, VHost}) -> {amqqueue, Name, Durable, AutoDelete, ExclusiveOwner, Arguments, Pid, SlavePids, SyncSlavePids, DSN, Policy, OperatorPolicy, GmPids, Decorators, State, PolicyVersion, SlavePidsPendingShutdown, VHost, #{}} end, [name, durable, auto_delete, exclusive_owner, arguments, pid, slave_pids, sync_slave_pids, recoverable_slaves, policy, operator_policy, gm_pids, decorators, state, policy_version, slave_pids_pending_shutdown, vhost, options]). %% Prior to 3.6.0, passwords were hashed using MD5, this populates %% existing records with said default. Users created with 3.6.0+ will %% have internal_user.hashing_algorithm populated by the internal %% authn backend. -spec user_password_hashing() -> 'ok'. user_password_hashing() -> transform( rabbit_user, fun ({internal_user, Username, Hash, Tags}) -> {internal_user, Username, Hash, Tags, rabbit_password_hashing_md5} end, [username, password_hash, tags, hashing_algorithm]). -spec topic_permission() -> 'ok'. topic_permission() -> create(rabbit_topic_permission, [{record_name, topic_permission}, {attributes, [topic_permission_key, permission]}, {disc_copies, [node()]}]). -spec exchange_options() -> 'ok'. exchange_options() -> ok = exchange_options(rabbit_exchange), ok = exchange_options(rabbit_durable_exchange). exchange_options(Table) -> transform( Table, fun ({exchange, Name, Type, Dur, AutoDel, Internal, Args, Scratches, Policy, OperatorPolicy, Decorators}) -> {exchange, Name, Type, Dur, AutoDel, Internal, Args, Scratches, Policy, OperatorPolicy, Decorators, #{}} end, [name, type, durable, auto_delete, internal, arguments, scratches, policy, operator_policy, decorators, options]). %%-------------------------------------------------------------------- transform(TableName, Fun, FieldList) -> rabbit_table:wait([TableName]), {atomic, ok} = mnesia:transform_table(TableName, Fun, FieldList), ok. transform(TableName, Fun, FieldList, NewRecordName) -> rabbit_table:wait([TableName]), {atomic, ok} = mnesia:transform_table(TableName, Fun, FieldList, NewRecordName), ok. create(Tab, TabDef) -> rabbit_log:debug("Will create a schema table named '~s'", [Tab]), {atomic, ok} = mnesia:create_table(Tab, TabDef), ok. %% Dumb replacement for rabbit_exchange:declare that does not require %% the exchange type registry or worker pool to be running by dint of %% not validating anything and assuming the exchange type does not %% require serialisation. NB: this assumes the %% pre-exchange-scratch-space format declare_exchange(XName, Type) -> X = {exchange, XName, Type, true, false, false, []}, ok = mnesia:dirty_write(rabbit_durable_exchange, X).