forked from massemanet/eper
/
prfTarg.erl
189 lines (159 loc) · 5.38 KB
/
prfTarg.erl
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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
%% -*- erlang-indent-level: 2 -*-
%%%-------------------------------------------------------------------
%%% Created : 1 Dec 2003 by Mats Cronqvist <qthmacr@duna283>
%%%-------------------------------------------------------------------
-module(prfTarg).
-export([config/1,subscribe/3,unsubscribe/2]).
-export([init/0,loop/1]). %internal; otp r5 compatible!
-import(net_kernel,[get_net_ticktime/0]).
-import(orddict,[new/0,store/3,fold/3,map/2,find/2,is_key/2,append/3]).
-record(st, {collectors=new()}).
-record(collector, {subscribers=[],state=init}).
-include("log.hrl").
%%% interface %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
config(ConfData) ->
case whereis(prfTarg) of
underfined -> not_started;
Pid -> Pid ! {config,ConfData}
end.
subscribe(Node, Pid, Collectors) ->
{PID,Tick} = assert(Node,Collectors),
PID ! {subscribe, {Pid,Collectors}},
{PID,Tick}.
unsubscribe(Node, Pid) ->
{Node,?MODULE} ! {unsubscribe, {Pid}}.
%%% runs on host %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
assert(Node,Collectors) ->
assert_loaded(Node,Collectors),
assert_started(Node).
assert_loaded(Node, Collectors) ->
lists:foreach(fun(M) -> ass_loaded(Node,M) end,
[prf,prf_crypto,?MODULE|Collectors]).
ass_loaded(nonode@nohost, Mod) -> {module,Mod}=c:l(Mod);
ass_loaded(Node, Mod) ->
case rpc:call(Node,Mod,module_info,[compile]) of
{badrpc,{'EXIT',{undef,_}}} -> %no code
netload(Node, Mod),
ass_loaded(Node, Mod);
{badrpc,_} ->
ok;
CompInfo when is_list(CompInfo) ->
case {ftime(CompInfo), ftime(Mod:module_info(compile))} of
{interpreted,_} ->
ok;
{TargT, HostT} when TargT < HostT -> %old code on target
netload(Node, Mod),
ass_loaded(Node, Mod);
_ ->
ok
end
end.
netload(Node, Mod) ->
{Mod, Bin, Fname} = code:get_object_code(Mod),
{module, Mod} = rpc:call(Node, code, load_binary, [Mod, Fname, Bin]).
ftime([]) -> interpreted;
ftime([{time,T}|_]) -> T;
ftime([_|T]) -> ftime(T).
assert_started(nonode@nohost) ->
starter(spawn(?MODULE, init, []));
assert_started(Node) ->
case net_adm:ping(Node) of
pang->
exit(node_down);
pong ->
starter(spawn(Node, ?MODULE, init, []))
end.
starter(Pid) ->
Ref = erlang:monitor(process,Pid),
Pid ! {start,self()},
receive
{ack, Pid, Tick} -> erlang:demonitor(Ref), {Pid,Tick};
{'DOWN', Ref, process, Pid, {use_me, PID,Tick}} -> {PID,Tick}
end.
%%% runs on target %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
init() ->
erlang:process_flag(trap_exit,true),
erlang:group_leader(whereis(user),self()),
receive {start,Pid} -> ok end,
case whereis(?MODULE) of %to avoid register error msg...
undefined ->
case catch register(?MODULE, self()) of
{'EXIT', {badarg, _}} -> %somebody beat us to it
exit({use_me, whereis(?MODULE),get_net_ticktime()});
true ->
Pid ! {ack, self(),get_net_ticktime()},
prf:ticker_odd(),
loop(#st{})
end;
PID ->
exit({use_me, PID,get_net_ticktime()})
end.
loop(St) ->
receive
{timeout, _, {tick}} ->
prf:ticker_odd(),
erlang:garbage_collect(self()),
?MODULE:loop(collect_and_send(St));
{subscribe, {Pid,Collectors}} ->
?MODULE:loop(subscr(St, Pid, Collectors));
{unsubscribe, {Pid}} ->
?MODULE:loop(unsubscr(St, Pid));
{'EXIT', Pid, _} ->
?MODULE:loop(unsubscr(St, Pid));
{config,CollData} ->
?MODULE:loop(config(St,CollData));
dbg ->
F = fun(M,#collector{subscribers=S},A) -> [{mod,M},{subsc,S}|A] end,
?log([{pid,self()} | fold(F,[],St#st.collectors)]),
?MODULE:loop(St);
stop ->
ok
end.
config(St,CollData) ->
St#st{collectors=map(fun(K,V)->conf(K,V,CollData) end,St#st.collectors)}.
conf(C,Collector,{C,Data}) ->
State = C:config(Collector#collector.state,Data),
Collector#collector{state=State};
conf(_,Collector,_) ->
Collector.
subscr(St, Pid, Cs) ->
link(Pid),
{Pid,Collectors} = lists:foldl(fun subs/2, {Pid,St#st.collectors}, Cs),
St#st{collectors=Collectors}.
subs(C, {Pid, Collectors}) ->
{Pid,store(C,collector(Collectors,Pid,C),Collectors)}.
collector(Colls,Pid,C) ->
case find(C, Colls) of
{ok, Coll = #collector{subscribers=Subs}} ->
Coll#collector{subscribers=lists:umerge(Subs,[Pid])};
error ->
#collector{subscribers=[Pid]}
end.
unsubscr(St = #st{collectors = Colls}, Pid) ->
St#st{collectors=map(fun(_K,V)->unsubs(Pid,V) end, Colls)}.
unsubs(Pid,C) ->
C#collector{subscribers=C#collector.subscribers--[Pid]}.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
collect_and_send(St) ->
St#st{collectors=cns(St#st.collectors)}.
cns(Colls) ->
{NewColls,Datas} = fold(fun cns/3,{Colls,new()},Colls),
send(Datas),
NewColls.
cns(Module,Coll,{Colls,Datas}) ->
case Coll#collector.subscribers of
[] ->
{Colls,Datas};
Subs ->
{NState, Data} = (Module):collect(Coll#collector.state),
{store(Module,Coll#collector{state=NState},Colls),stall(Data,Subs,Datas)}
end.
stall(Data,Subs,Datas) ->
lists:foldl(fun(S,Dict)->stll(S,Dict,Data) end,Datas,Subs).
stll(Sub,Dict,Data) ->
case is_key(Sub,Dict) of
true -> append(Sub,Data,Dict);
false-> store(Sub,[Data],Dict)
end.
send(Dict) -> fold(fun sendf/3, [], Dict).
sendf(Sub,Data,_) -> Sub ! {{data,node()},Data}.