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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| %% | ||
| %% %CopyrightBegin% | ||
| %% | ||
| %% Copyright Ericsson AB 1996-2021. All Rights Reserved. | ||
| %% | ||
| %% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 | ||
| %% | ||
| %% Unless required by applicable law or agreed to in writing, software | ||
| %% distributed under the License is distributed on an "AS IS" BASIS, | ||
| %% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| %% See the License for the specific language governing permissions and | ||
| %% limitations under the License. | ||
| %% | ||
| %% %CopyrightEnd% | ||
| %% | ||
|
|
||
| -module(mnesia_hook). | ||
|
|
||
| -include("mnesia.hrl"). | ||
|
|
||
| -export([ | ||
| register_hook/2, | ||
| unregister_hook/1, | ||
| do_post_commit/2 | ||
| ]). | ||
|
|
||
| -define(hook(NAME), {mnesia_hook, NAME}). | ||
|
|
||
| -type post_commit_hook_data() :: | ||
| #{ node => node() | ||
| , ram_copies => list() | ||
| , disc_copies => list() | ||
| , disc_only_copies => list() | ||
| , ext => list() | ||
| , schema_ops => list() | ||
| }. | ||
|
|
||
| -type post_commit_hook() :: fun((_Tid, post_commit_hook_data()) -> ok). | ||
|
|
||
| -spec register_hook(post_commit, post_commit_hook()) -> ok | {error, term()}. | ||
| register_hook(post_commit, Hook) when is_function(Hook, 2) -> | ||
| persistent_term:put(?hook(post_commit), Hook); | ||
| register_hook(_, _) -> | ||
| {error, bad_type}. | ||
|
|
||
| -spec unregister_hook(post_commit) -> boolean() | {error, term()}. | ||
| unregister_hook(post_commit) -> | ||
| persistent_term:erase(?hook(post_commit)); | ||
| unregister_hook(_) -> | ||
| {error, bad_type}. | ||
|
|
||
| -spec do_post_commit(_Tid, #commit{}) -> ok. | ||
| do_post_commit(Tid, Commit) -> | ||
| case persistent_term:get(?hook(post_commit), undefined) of | ||
| undefined -> | ||
| ok; | ||
| Fun -> | ||
| #commit{ node = Node | ||
| , ram_copies = Ram | ||
| , disc_copies = Disc | ||
| , disc_only_copies = DiscOnly | ||
| , ext = Ext | ||
| , schema_ops = SchemaOps | ||
| } = Commit, | ||
| CommitData = #{ node => Node | ||
| , ram_copies => Ram | ||
| , disc_copies => Disc | ||
| , disc_only_copies => DiscOnly | ||
| , ext => Ext | ||
| , schema_ops => SchemaOps | ||
| }, | ||
| try Fun(Tid, CommitData) | ||
| catch EC:Err:St -> | ||
| CommitTabs = commit_tabs(Ram, Disc, DiscOnly, Ext), | ||
| mnesia_lib:dbg_out("Mnesia post_commit hook failed: ~p:~p~nStacktrace:~p~nCommit tables:~p~n", | ||
| [EC, Err, stack_without_args(St), CommitTabs]) | ||
| end, | ||
| ok | ||
| end. | ||
|
|
||
| %% May be helpful for debugging | ||
| commit_tabs(Ram, Disc, DiscOnly, Ext) -> | ||
| Acc = tabs_from_ops(Ram, []), | ||
| Acc1 = tabs_from_ops(Disc, Acc), | ||
| Acc2 = tabs_from_ops(DiscOnly, Acc1), | ||
| lists:uniq(tabs_from_ops(Ext, Acc2)). | ||
|
|
||
| tabs_from_ops([{{Tab, _K}, _Val, _Op} | T], Acc) -> | ||
| tabs_from_ops(T, [Tab | Acc]); | ||
| tabs_from_ops([_ | T], Acc) -> | ||
| tabs_from_ops(T, Acc); | ||
| tabs_from_ops([], Acc) -> | ||
| Acc. | ||
|
|
||
| %% Args may contain sensitive data | ||
| stack_without_args([{M, F, Args, Info} | T]) when is_list(Args) -> | ||
| [{M, F, length(Args), Info} | stack_without_args(T)]; | ||
| stack_without_args([StItem | T] ) -> | ||
| [StItem | stack_without_args(T)]; | ||
| stack_without_args([]) -> | ||
| []. |
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