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-module(mongoose_cleaner). |
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-behaviour(gen_server). |
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%% API |
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-export([start_link/0]). |
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%% gen_server callbacks |
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-export([init/1, |
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handle_call/3, |
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handle_cast/2, |
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handle_info/2, |
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terminate/2, |
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code_change/3]). |
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-ignore_xref([start_link/0]). |
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-include("mongoose.hrl"). |
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-define(NODE_CLEANUP_LOCK(Node), {node_cleanup_lock, Node}). |
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-define(SERVER, ?MODULE). |
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-record(state, {}). |
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%%%=================================================================== |
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%%% API |
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%%%=================================================================== |
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start_link() -> |
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gen_server:start_link({local, ?SERVER}, ?MODULE, [], []). |
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%%%=================================================================== |
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%%% gen_server callbacks |
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%%%=================================================================== |
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init([]) -> |
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case net_kernel:monitor_nodes(true) of |
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ok -> |
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{ok, #state{}}; |
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Error -> |
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:-( |
?LOG_ERROR(#{what => cleaner_monitor_failed, |
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text => <<"mongoose_cleaner failed to monitor nodes">>, |
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:-( |
reason => Error}), |
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:-( |
{stop, Error} |
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end. |
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handle_call(_Request, _From, State) -> |
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:-( |
Reply = ok, |
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:-( |
{reply, Reply, State}. |
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handle_cast(_Msg, State) -> |
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:-( |
{noreply, State}. |
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handle_info({nodedown, Node}, State) -> |
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?LOG_WARNING(#{what => cleaner_nodedown, |
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text => <<"mongoose_cleaner received nodenown event">>, |
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:-( |
down_node => Node}), |
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cleanup_modules(Node), |
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{noreply, State}; |
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handle_info(_Info, State) -> |
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{noreply, State}. |
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terminate(_Reason, _State) -> |
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:-( |
ok. |
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code_change(_OldVsn, State, _Extra) -> |
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:-( |
{ok, State}. |
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%%%=================================================================== |
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%%% Internal functions |
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%%%=================================================================== |
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cleanup_modules(Node) -> |
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LockKey = ?NODE_CLEANUP_LOCK(Node), |
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LockRequest = {LockKey, self()}, |
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C = fun () -> run_node_cleanup(Node) end, |
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Nodes = [node() | nodes()], |
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Retries = 1, |
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case global:trans(LockRequest, C, Nodes, Retries) of |
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aborted -> |
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:-( |
?LOG_INFO(#{what => cleaner_trans_aborted, |
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text => <<"mongoose_cleaner failed to get global lock">>, |
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:-( |
lock_key => LockKey}), |
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:-( |
{ok, aborted}; |
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Result -> |
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{ok, Result} |
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end. |
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run_node_cleanup(Node) -> |
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{Elapsed, RetVal} = timer:tc(fun() -> |
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mongoose_hooks:node_cleanup(Node), |
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[mongoose_hooks:node_cleanup_for_host_type(HostType, Node) || HostType <- ?ALL_HOST_TYPES], |
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ok |
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end), |
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?LOG_NOTICE(#{what => cleaner_done, |
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text => <<"Finished cleaning after dead node">>, |
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duration => erlang:round(Elapsed / 1000), |
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down_node => Node, result => RetVal}), |
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RetVal. |