1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2018. 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(supervisor_bridge).
-behaviour(gen_server).
-include("logger.hrl").
%% External exports
-export([start_link/2, start_link/3]).
%% Internal exports
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2]).
-export([code_change/3]).
-callback init(Args :: term()) ->
{ok, Pid :: pid(), State :: term()} | ignore | {error, Error :: term()}.
-callback terminate(Reason :: (shutdown | term()), State :: term()) ->
Ignored :: term().
%%%-----------------------------------------------------------------
%%% This is a rewrite of supervisor_bridge from BS.3.
%%%
%%% This module is built to function as process code
%%% for a process sitting inbetween a real supervisor
%%% and a not start&recovery complient server/system
%%% The process inbetween simulates start&recovery
%%% behaviour of the server/system below.
%%%
%%% The supervisor_bridge behaviour must export the following
%%% functions:
%%% init(Args) -> {ok, Pid, State} | {error, Reason} | ignore
%%% where Pid is the child process
%%% terminate(Reason, State) -> ok
%%%-----------------------------------------------------------------
-record(state, {mod, pid, child_state, name}).
-spec start_link(Module, Args) -> Result when
Module :: module(),
Args :: term(),
Result :: {ok, Pid} | ignore | {error, Error},
Error :: {already_started, Pid} | term(),
Pid :: pid().
start_link(Mod, StartArgs) ->
gen_server:start_link(supervisor_bridge, [Mod, StartArgs, self], []).
-spec start_link(SupBridgeName, Module, Args) -> Result when
SupBridgeName :: {local, Name} | {global, Name},
Name :: atom(),
Module :: module(),
Args :: term(),
Result :: {ok, Pid} | ignore | {error, Error},
Error :: {already_started, Pid} | term(),
Pid :: pid().
start_link(Name, Mod, StartArgs) ->
gen_server:start_link(Name, supervisor_bridge, [Mod, StartArgs, Name], []).
%%-----------------------------------------------------------------
%% Callback functions from gen_server
%%-----------------------------------------------------------------
init([Mod, StartArgs, Name0]) ->
process_flag(trap_exit, true),
Name = supname(Name0, Mod),
case Mod:init(StartArgs) of
{ok, Pid, ChildState} when is_pid(Pid) ->
link(Pid),
report_progress(Pid, Mod, StartArgs, Name),
{ok, #state{mod = Mod, pid = Pid,
child_state = ChildState, name = Name}};
ignore ->
ignore;
{error, Reason} ->
{stop, Reason}
end.
supname(self, Mod) -> {self(),Mod};
supname(N, _) -> N.
%% A supervisor *must* answer the supervisor:which_children call.
handle_call(which_children, _From, State) ->
{reply, [], State};
handle_call(_Req, _From, State) ->
{reply, {error, badcall}, State}.
handle_cast(_, State) ->
{noreply, State}.
handle_info({'EXIT', Pid, Reason}, State) when State#state.pid =:= Pid ->
case Reason of
normal ->
ok;
shutdown ->
ok;
{shutdown, _Term} ->
ok;
_ ->
report_error(child_terminated, Reason, State)
end,
{stop, Reason, State#state{pid = undefined}};
handle_info(_, State) ->
{noreply, State}.
terminate(_Reason, #state{pid = undefined}) ->
ok;
terminate(Reason, State) ->
terminate_pid(Reason, State).
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%% This function is supposed to terminate the 'real' server.
terminate_pid(Reason, #state{mod = Mod, child_state = ChildState}) ->
Mod:terminate(Reason, ChildState).
report_progress(Pid, Mod, StartArgs, SupName) ->
?LOG_INFO(#{label=>{supervisor,progress},
report=>[{supervisor, SupName},
{started, [{pid, Pid},
{mfa, {Mod, init, [StartArgs]}}]}]},
#{domain=>[otp,sasl],
report_cb=>fun logger:format_otp_report/1,
logger_formatter=>#{title=>"PROGRESS REPORT"},
error_logger=>#{tag=>info_report,type=>progress}}).
report_error(Error, Reason, #state{name = Name, pid = Pid, mod = Mod}) ->
?LOG_ERROR(#{label=>{supervisor,error},
report=>[{supervisor, Name},
{errorContext, Error},
{reason, Reason},
{offender, [{pid, Pid}, {mod, Mod}]}]},
#{domain=>[otp,sasl],
report_cb=>fun logger:format_otp_report/1,
logger_formatter=>#{title=>"SUPERVISOR REPORT"},
error_logger=>#{tag=>error_report,type=>supervisor_report}}).
|
