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jobs_server.erl
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jobs_server.erl
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%%==============================================================================
%% Copyright 2014 Ulf Wiger
%%
%% 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.
%%==============================================================================
%%-------------------------------------------------------------------
%% File : jobs_server.erl
%% @author : Ulf Wiger <[email protected]>
%% @end
%% Description :
%%
%% Created : 15 Jan 2010 by Ulf Wiger <[email protected]>
%%-------------------------------------------------------------------
-module(jobs_server).
-behaviour(gen_server).
-export([ask/0,
ask/1,
run/1, run/2,
done/1,
enqueue/2,
dequeue/2]).
-export([set_modifiers/1]).
-export([ask_queue/2]).
%% Config API
-export([add_queue/2,
modify_queue/2,
delete_queue/1,
add_counter/2,
modify_counter/2,
delete_counter/1,
add_group_rate/2,
modify_group_rate/2,
delete_group_rate/1,
info/1,
queue_info/1,
queue_info/2,
modify_regulator/4]).
-export([auto_restore/1]).
-export([timestamp/0,
timestamp_to_datetime/1]).
-export([start_link/0,
start_link/1]).
-export([init/1,
handle_call/3,
handle_cast/2,
handle_info/2,
terminate/2,
code_change/3]).
-import(proplists, [get_value/3]).
-include("jobs.hrl").
-record(st, {queues = [] :: [#queue{}] | [tuple()],
group_rates = [] :: [#grp{}],
counters = [] :: [#cr{}],
monitors,
q_select :: atom(),
q_select_st :: any(),
default_queue,
info_f}).
-record(q_check, {n = 0,
empty = false,
depleted = false,
counters = [],
regulators = []}).
-define(SERVER, ?MODULE).
-ifdef(OTP_RELEASE).
-define(WITH_STACKTRACE(T, R, S), T:R:S ->).
-else.
-define(WITH_STACKTRACE(T, R, S), T:R -> S = erlang:get_stacktrace(),).
-endif.
-type queue_name() :: any().
-type info_category() :: queues | group_rates | counters.
-spec ask() -> {ok, any()} | {error, rejected | timeout}.
%%
ask() ->
ask(default).
-spec ask(job_class()) -> {ok, reg_obj()} | {error, rejected | timeout}.
%%
ask(Type) ->
call(?SERVER, {ask, Type}, infinity).
-spec run(fun(() -> X)) -> X.
%%
run(Fun) when is_function(Fun, 0) ->
run(undefined, Fun).
-spec run(job_class(), fun(() -> X)) -> X.
%%
run(Type, Fun) when is_function(Fun, 0) ->
case ask(Type) of
{ok, Opaque} ->
try Fun()
after
done(Opaque)
end;
{error,Reason} ->
erlang:error(Reason)
end;
run(Type, Fun) when is_function(Fun, 1) ->
case ask(Type) of
{ok, Opaque} ->
try Fun(Opaque)
after
done(Opaque)
end;
{error,Reason} ->
erlang:error(Reason)
end.
-spec done(reg_obj()) -> ok.
%%
done({undefined, _}) ->
%% no monitoring on this job (e.g. from a {action, approve} queue)
ok;
done(Opaque) ->
gen_server:cast(?MODULE, {done, self(), del_info(Opaque)}).
del_info({Ref, L}) ->
{Ref, lists:keydelete(info, 1, L)}.
-spec enqueue(job_class(), any()) -> ok.
%%
enqueue(Type, Item) ->
call(?SERVER, {enqueue, Type, Item}, infinity).
-spec dequeue(job_class(), integer() | infinity) -> [{timestamp(), any()}].
%%
dequeue(Type, N) when N==infinity; is_integer(N), N > 0 ->
call(?SERVER, {dequeue, Type, N}, infinity).
-spec add_queue(queue_name(), q_opts()) -> ok.
%%
add_queue(Name, Options) ->
call(?SERVER, {add_queue, Name, Options}).
-spec modify_queue(queue_name(), q_opts()) -> ok | {error, any()}.
%%
modify_queue(Name, Options) ->
call(?SERVER, {modify_queue, Name, Options}).
-spec delete_queue(queue_name()) -> ok.
delete_queue(Name) ->
call(?SERVER, {delete_queue, Name}).
%% @spec ask_queue(QName, Request) -> Reply
%% @doc Invoke the Q:handle_call/3 function (if it exists).
%%
%% Send a request to a specific queue in the JOBS server.
%% Each queue has its own local state, allowing it to collect special statistics.
%% This function allows a client to send a request that is handled by a specific
%% queue instance, either to pull information from the queue, or to influence its
%% state.
%% @end
%%
-spec ask_queue(queue_name(), any()) -> any().
ask_queue(QName, Request) ->
call(?SERVER, {ask_queue, QName, Request}).
-spec info(info_category()) -> [any()].
info(Item) ->
call(?SERVER, {info, Item}).
queue_info(Name) ->
call(?SERVER, {queue_info, Name}).
queue_info(Name, Item) ->
call(?SERVER, {queue_info, Name, Item}).
add_group_rate(Name, Options) ->
call(?SERVER, {add_group_rate, Name, Options}).
modify_group_rate(Name, Opts) ->
call(?SERVER, {modify_group_rate, Name, Opts}).
delete_group_rate(Name) ->
call(?SERVER, {delete_group_rate, Name}).
modify_regulator(Type, QName, RegName, Opts) ->
call(?SERVER, {modify_regulator, Type, QName, RegName, Opts}).
add_counter(Name, Options) ->
call(?SERVER, {add_counter, Name, Options}).
modify_counter(Name, Opts) ->
call(?SERVER, {modify_counter, Name, Opts}).
delete_counter(Name) ->
call(?SERVER, {delete_counter, Name}).
%% Sampler API
%%
set_modifiers(Modifiers) ->
call(?SERVER, {set_modifiers, Modifiers}).
%% Client-side call function
%%
call(Server, Req) ->
call(Server, Req, infinity).
call(Server, Req, Timeout) ->
case gen_server:call(Server, Req, Timeout) of
badarg ->
erlang:error(badarg);
{badarg, Reason} ->
erlang:error(Reason);
Res ->
Res
end.
%% Reply functions called by the server
%% approve(From) ->
%% approve(From, []).
approve(From, Counters) ->
gen_server:reply(From, {ok, Counters}).
reject(From) ->
gen_server:reply(From, {error, rejected}).
timeout({_, {Pid,Ref} = From}) when is_pid(Pid), is_reference(Ref) ->
gen_server:reply(From, {error, timeout}).
%% start function
-spec start_link() -> {ok, pid()}.
%%
start_link() ->
start_link(options()).
-type ctx_options() :: [{_Ctxt :: env | opts, _App:: user | atom(), [option()]}].
-spec start_link(ctx_options()) -> {ok, pid()}.
%%
start_link(Opts0) when is_list(Opts0) ->
ensure_ets(),
Opts = expand_opts(sort_groups(group_opts(Opts0))),
gen_server:start_link({local,?MODULE}, ?MODULE, Opts, []).
%% Server-side callbacks and helpers
ensure_ets() ->
case ets:info(?MODULE, name) of
undefined ->
ets:new(?MODULE, [public, named_table, ordered_set]);
_ ->
true
end.
-spec options() -> ctx_options().
options() ->
JobsOpts = {env, jobs, application:get_all_env(jobs)},
Other = try [{env, A, Os} || {A, Os} <- setup:find_env_vars(jobs)]
catch
error:undef -> []
end,
[JobsOpts | Other].
group_opts([{_,_,_} = H|T]) ->
[H|group_opts(T)];
group_opts([{_,_}|_] = Opts) ->
{U, Rest} = lists:splitwith(fun(X) -> size(X) == 2 end, Opts),
[{opts, user, U}|group_opts(Rest)];
group_opts([]) ->
[].
sort_groups(Gs) ->
%% How to give priority to certain 'global' options?
%% 1. Options specified explicitly in Options
%% 2. Options specified as 'jobs' environment variables
%% (there are none by default)
%% 3. Options in other apps, as returned by 'setup:find_env_vars/1'
%%
%% Note that, as of now, we 'lift' all user options to the fore, even if
%% they appear mixed in the argument given to jobs_server:start_link/1.
%%
User = [U || {opts, user, _} = U <- Gs],
[Jobs] = [J || {env, jobs, _} = J <- Gs],
User ++ [Jobs | Gs -- [Jobs | User]].
-spec expand_opts(ctx_options()) -> ctx_options().
%%
expand_opts([{Ctxt, A, Opts}|T]) ->
Exp = try expand_opts_(Opts)
catch
throw:{{error,R}, Arg} ->
error(R, [{context, Ctxt}, {app, A} | Arg])
end,
[{Ctxt, A, Exp}|expand_opts(T)];
expand_opts([]) ->
[].
expand_opts_([{config, F}|Opts]) ->
case file:script(F) of
{ok, NewOpts} ->
NewOpts ++ expand_opts_(Opts);
{error, _} = E ->
throw({E, [{config,F}]})
end;
expand_opts_([H|T]) ->
[H|expand_opts_(T)];
expand_opts_([]) ->
[].
standard_rate(R) when is_integer(R), R >= 0 ->
[{regulators,
[{rate,
[{limit, R},
{modifiers, standard_modifiers()}]
}]
}].
standard_counter(N) when is_integer(N), N >= 0 ->
[{regulators,
[{counter,
[{limit, N},
{modifiers, standard_modifiers()}]
}]
}].
-spec standard_modifiers() -> [q_modifier(),...].
%%
standard_modifiers() ->
[{cpu, 10},
{memory, 10}].
-spec init([option()]) -> {ok, #st{}}.
%%
init(Opts) ->
process_flag(priority,high),
S0 = #st{},
[Qs, Gs, Cs] =
[get_all_values(K,Opts,Def)
|| {K,Def} <- [{queues , [{default,[]}]},
{group_rates, []},
{counters , []}]],
Groups = init_groups(Gs),
Counters = init_counters(Cs),
S1 = S0#st{group_rates = Groups,
counters = Counters},
Queues = init_queues(Qs, S1),
Default0 = case Queues of
[] ->
undefined;
[#queue{name = N}|_] ->
N
end,
Default = get_first_value(default_queue, Opts, Default0),
{ok, replay(
set_info(
kick_producers(
lift_counters(S1#st{queues = Queues,
default_queue = Default,
monitors = ets:new(monitors,[set])}))))}.
init_queues(Qs, S) ->
lists:map(fun(Q) ->
init_queue(Q, S)
end, Qs).
init_queue({Name, standard_rate, R}, S) when is_integer(R), R > 0 ->
init_queue({Name, standard_rate(R)}, S);
init_queue({Name, standard_counter, N}, S) when is_integer(N), N > 0 ->
init_queue({Name, standard_counter(N)}, S);
init_queue({Name, passive, Opts}, S) ->
init_queue({Name, [{type, {passive, fifo}} | Opts]}, S);
init_queue({Name, Action}, _S) when Action==approve; Action==reject ->
#queue{name = Name, type = {action, Action}};
init_queue({Name, producer, F, Opts}, S) ->
init_queue({Name, [{type, {producer, F}} | Opts]}, S);
init_queue({Name, Opts0}, S) when is_list(Opts0) ->
%% Allow the regulators to be named at the top-level.
%% This makes it possible to write {q, [{counter, [{limit,1}]}]},
%% instead of {q, [{regulators, [{counter, [{limit,1}]}]}]}.
{Regs0, Opts} = lists:foldr(
fun(X, {R,O}) when is_tuple(X) ->
case lists:member(
element(1,X), [counter, rate,
named_counter,
group_rate]) of
true -> {[X|R], O};
false -> {R, [X|O]}
end;
(X, {R, O}) -> {R, [X|O]}
end, {[], []}, normalize_options(Opts0)),
[ChkI, Regs] =
[get_value(K,Opts,D) ||
{K, D} <- [{check_interval,undefined},
{regulators, Regs0}]],
Q0 = q_new([{name,Name}|Opts]),
Q1 = init_regulators(Regs, Q0#queue{check_interval = ChkI}),
calculate_check_interval(Q1, S).
normalize_options(Opts) ->
merge_regulators(
lists:flatmap(
fun({standard_rate, R}) when is_integer(R), R >= 0 ->
standard_rate(R);
({standard_counter, C}) when is_integer(C), C >= 0 ->
standard_counter(C);
({producer, F}) ->
[{type, {producer, F}}];
(passive) ->
[{type, {passive, fifo}}];
(A) when A==approve; A==reject ->
[{type, {action, approve}}];
({action, A}) when A==approve; A==reject ->
[{type, {action, approve}}];
({K, V}) ->
[{K, V}]
end, Opts)).
merge_regulators(Opts) ->
merge_regulators(lists:keytake(regulators, 1, Opts), Opts, []).
merge_regulators(false, Opts, []) ->
Opts;
merge_regulators(false, Opts, Regs) ->
[{regulators, Regs}|Opts];
merge_regulators({value, {regulators, Rs}, Opts}, _, Acc) ->
merge_regulators(lists:keytake(regulators, 1, Opts), Opts,
Acc ++ Rs).
calculate_check_interval(#queue{regulators = Rs,
check_interval = undefined} = Q, S) ->
Regs = expand_regulators(Rs, S),
I = lists:foldl(
fun(R, Acc) ->
Rate = get_rate(R),
erlang:min(Rate#rate.interval, Acc)
end, infinity, Regs),
Q#queue{check_interval = I};
calculate_check_interval(Q, _) ->
Q.
init_groups(Gs) ->
lists:map(
fun({Name, Opts}) ->
init_group(Opts, #grp{name = Name})
end, Gs).
init_group(Opts, G) ->
R = #rate{},
Limit = get_value(limit, Opts, R#rate.limit),
Modifiers = get_value(modifiers, Opts, R#rate.modifiers),
Interval = interval(Limit),
G#grp{rate = #rate{limit = Limit,
preset_limit = Limit,
modifiers = Modifiers,
interval = Interval}}.
init_counters(Cs) ->
lists:map(
fun({Name, Opts}) ->
init_counter([{name, Name}|Opts], #cr{name = Name,
shared = true})
end, Cs).
init_regulators(Rs, #queue{name = Qname} = Q) ->
{Rs1,_} = lists:mapfoldl(
fun({rate, Opts}, {Rx,Cx}) ->
Name0 = {rate,Qname,Rx},
R0 = #rate{},
RR0 = #rr{name = Name0, rate = R0},
{init_rate_regulator(Opts, RR0), {Rx+1, Cx}};
({counter, Opts}, {Rx,Cx}) when is_list(Opts) ->
Name0 = {counter,Qname,Cx},
Name = get_value(name, Opts, Name0),
{init_counter(Opts, #cr{name = Name,
owner = Qname}), {Rx,Cx+1}};
({named_counter, Name, Incr}, {Rx,Cx}) when is_integer(Incr) ->
{#counter{name = Name, increment = Incr}, {Rx,Cx+1}};
({group_rate, R} = Link, Acc) when is_atom(R) ->
{Link, Acc}
%% ({counter, R} = Link, Acc) when is_atom(R) ->
%% {Link, Acc}
end, {1,1}, Rs),
case [RR || #rr{} = RR <- Rs1] of
[_,_|_] = Multiples ->
erlang:error(only_one_rate_regulator_allowed, Multiples);
_ ->
ok
end,
Q#queue{regulators = Rs1}.
init_rate_regulator(Opts, #rr{rate = R} = RR) ->
[Limit,Modifiers,Name] =
[get_value(K,Opts,D) ||
{K,D} <- [{limit , R#rate.limit},
{modifiers, R#rate.modifiers},
{name , RR#rr.name}]],
Interval = interval(Limit),
RR#rr{name = Name,
rate = #rate{limit = Limit,
interval = Interval,
preset_limit = Limit,
modifiers = Modifiers}}.
%% init_counter(Opts) ->
%% init_counter(Opts, #cr{}).
init_counter(Opts, #cr{} = CR0) ->
R = #rate{},
Limit = get_value(limit, Opts, R#rate.limit),
Interval = get_value(interval, Opts, ?COUNTER_SAMPLE_INTERVAL),
Increment = get_value(increment, Opts, 1),
Modifiers = get_value(modifiers, Opts, R#rate.modifiers),
CR0#cr{rate = #rate{limit = Limit,
interval = Interval,
preset_limit = Limit,
modifiers = Modifiers},
increment = Increment}.
lift_counters(#st{queues = Qs} = S) ->
lists:foldl(fun do_lift_counters/2, S, Qs).
do_lift_counters(#queue{name = Name, regulators = Rs} = Q,
#st{queues = Queues, counters = Counters} = S0) ->
Aliases = [A || #counter{name = A} <- Rs],
S = lift_aliases(Aliases, Name, S0),
case [R || #cr{} = R <- Rs] of
[] ->
S;
[_|_] = CRs ->
{Rs1, Cs1} = lists:foldl(fun(CR,Acc) ->
mk_counter_alias(CR,Acc,Name)
end, {Rs, Counters}, CRs),
Q1 = Q#queue{regulators = Rs1},
Queues1 = lists:keyreplace(Name, #queue.name, Queues, Q1),
S#st{queues = Queues1, counters = Cs1}
end.
lift_aliases([], _, S) ->
S;
lift_aliases(Aliases, QName, #st{counters = Cs} = S) ->
Cs1 = lists:foldl(
fun(Alias, Csx) ->
case lists:keyfind(Alias, #cr.name, Csx) of
false ->
%% aliased counter doesn't exist...
%% We should probably issue a warning.
Csx;
#cr{queues = Queues} = Existing ->
Qs = [QName|Queues -- [QName]],
lists:keyreplace(Alias, #cr.name, Csx,
Existing#cr{queues = Qs})
end
end, Cs, Aliases),
S#st{counters = Cs1}.
mk_counter_alias(#cr{name = Name,
increment = I} = CR, {Rs, Cs}, QName) ->
Alias = #counter{name = Name, increment = I},
Rs1 = lists_replace(CR, Rs, Alias),
case lists:keyfind(Name, #cr.name, Cs) of
false ->
{Rs1, [CR#cr{queues = [QName]}|Cs]};
#cr{queues = Queues} = Existing ->
Qs = [QName|Queues -- [QName]],
{Rs1, lists:keyreplace(Name, #cr.name, Cs,
Existing#cr{queues = Qs})}
end.
pickup_aliases(Queues, #cr{name = N} = CR) ->
QNames = lists:foldl(
fun(#queue{name = QName, regulators = Rs}, Acc) ->
case [1 || #counter{name = Nx} <- Rs, Nx =:= N] of
[] ->
Acc;
[_|_] ->
[QName | Acc]
end
end, [], Queues),
CR#cr{queues = QNames}.
lists_replace(X, [X | T], With) -> [With | T];
lists_replace(X, [A | T], With) -> [A | lists_replace(X, T, With)].
-spec interval(integer()) -> undefined | float().
%%
%% Return the sampling interval (in ms) based on max frequency.
%% If max frequency is 0, we choose what corresponds to an unlimited interval
%%
interval(0 ) -> undefined; % greater than any int()
interval(Limit) ->
1000 / Limit.
set_info(S) ->
%% We need to clear the info_f attribute, to
%% avoid recursively inheriting all previous states.
S1 = S#st{info_f = undefined},
S1#st{info_f = fun(Q) ->
get_info(Q, S1)
end}.
%% Gen_server callbacks
handle_call(Req, From, S) ->
try i_handle_call(Req, From, S) of
{noreply, #st{} = S1} ->
{noreply, set_info(S1)};
{reply, R, #st{} = S1} ->
{reply, R, set_info(S1)}
catch
?WITH_STACKTRACE(error, Reason, Stacktrace)
io:fwrite("caught Reason = ~p~n", [{Reason, Stacktrace}]),
error_report([{error, Reason},
{request, Req},
{stacktrace, Stacktrace}]),
{reply, badarg, S}
end.
i_handle_call({ask, Type}, From, #st{queues = Qs} = S) ->
TS = timestamp(),
{Qname, S1} = select_queue(Type, TS, S),
case get_queue(Qname, Qs) of
#queue{type = #action{a = approve}, stateful = undefined,
approved = Approved} = Q ->
S2 = S1#st{queues = lists:keyreplace(
Qname, #queue.name, Qs,
Q#queue{approved = Approved + 1})},
approve(From, {undefined, []}), {noreply, S2};
#queue{type = #action{a = approve}, stateful = Stf,
approved = Approved} = Q ->
{Val, Stf1} = update_stateful(Stf, [], S1#st.info_f),
S2 = S1#st{queues = lists:keyreplace(
Qname, #queue.name, Qs,
Q#queue{stateful = Stf1,
approved = Approved + 1})},
approve(From, {undefined, [{info, Val}]}), {noreply, S2};
#queue{type = #action{a = reject}} ->
reject(From), {noreply, S1};
#queue{type = #producer{}} ->
{reply, badarg, S1};
#queue{} = Q ->
{Q2, QC, S2} = queue_job(TS, From, Q, S1),
{noreply, update_queue(Q2, QC, S2)};
false ->
{reply, badarg, S1}
end;
i_handle_call({enqueue, Type, Item}, _From, #st{queues = Qs} = S) ->
TS = timestamp(),
{Qname, S1} = select_queue(Type, TS, S),
case get_queue(Qname, Qs) of
#queue{type = {passive, _}, waiters = Ws} = Q ->
case Ws of
[] ->
{Result, S2} = do_enqueue(TS, Item, Q, S1),
{reply, Result, S2};
[From|Ws1] ->
gen_server:reply(From, [{TS, Item}]),
{reply, ok, update_queue(Q#queue{waiters = Ws1}, S)}
end;
_ ->
{reply, badarg, S1}
end;
i_handle_call({dequeue, Type, N}, From, #st{queues = Qs} = S) ->
{Qname, _S1} = select_queue(Type, undefined, S),
case get_queue(Qname, Qs) of
#queue{type = #passive{}, waiters = Ws} = Q ->
{Items, Q1} = q_out(N, Q),
case Items of
[] ->
{noreply, update_queue(Q1#queue{waiters = Ws ++ [From]}, S)};
Jobs ->
{reply, Jobs, update_queue(Q1, S)}
end;
_Other ->
io:fwrite("get_queue(~p, ~p) -> ~p~n", [Qname, Qs, _Other]),
{reply, badarg, S}
end;
i_handle_call({set_modifiers, Modifiers}, _, #st{queues = Qs,
group_rates = GRs,
counters = Cs} = S) ->
GRs1 = [apply_modifiers(Modifiers, G) || G <- GRs],
Qs1 = [apply_modifiers(Modifiers, Q) || Q <- Qs],
{Revisit,Cs1} =
lists:foldl(fun(C,{RevAcc,CAcc}) ->
C1 = apply_modifiers(Modifiers, C),
case get_rate(C) < get_rate(C1) of
true -> {union(C1#cr.queues,RevAcc),[C1|CAcc]};
_ -> {RevAcc,[C1|CAcc]}
end
end,{[],[]},Cs),
S1 = revisit_queues(Revisit,
S#st{queues = Qs1,
group_rates = GRs1,
counters = lists:reverse(Cs1)}),
{reply, ok, S1};
i_handle_call({add_queue, Name, Options} = Req, _, #st{queues = Qs} = S) ->
false = get_queue(Name, Qs),
NewQueues = init_queues([{Name, Options}], S),
save_req(Req),
revisit_queue(Name),
{reply, ok, lift_counters(S#st{queues = Qs ++ NewQueues})};
i_handle_call({modify_queue, Name, Options} = Req, _, #st{queues = Qs} = S) ->
case get_queue(Name, Qs) of
false ->
{reply, {error, not_found}, S};
#queue{} = Q ->
Q1 = lists:foldl(
fun({max_size, Sz}, Qx) when is_integer(Sz), Sz >= 0;
Sz==undefined ->
Qx#queue{max_size = Sz};
({max_time, T}, Qx) when is_integer(T), T >= 0;
T==undefined ->
Qx#queue{max_time = T}
end, Q, Options),
save_req(Req),
revisit_queue(Name),
{reply, ok, update_queue(Q1, S)}
end;
i_handle_call({delete_queue, Name} = Req, _, #st{queues = Qs} = S) ->
case get_queue(Name, Qs) of
false ->
{reply, false, S};
#queue{} = Q ->
%% for now, let's be very brutal
case Q of
#queue{st = undefined} -> ok;
_ ->
[reject(Client) || {_, Client} <- q_all(Q)]
end,
save_req(Req),
q_delete(Q),
{reply, true, S#st{queues = lists:keydelete(Name,#queue.name,Qs)}}
end;
i_handle_call({info, Item}, _, S) ->
{reply, get_info(Item, S), S};
i_handle_call({queue_info, Name}, _, #st{} = S) ->
{reply, get_queue_info(Name, S), S};
i_handle_call({queue_info, Name, Item}, _, #st{} = S) ->
{reply, get_queue_info(Name, Item, S), S};
i_handle_call({modify_regulator, Type, Qname, RegName, Opts} = Req, _, S) ->
case get_queue(Qname, S#st.queues) of
#queue{} = Q ->
case do_modify_regulator(Type, RegName, Opts, Q) of
badarg ->
{reply, badarg, S};
Q1 ->
S1 = update_queue(Q1, S),
save_req(Req),
{reply, ok, S1}
end;
_ ->
{reply, badarg, S}
end;
i_handle_call({modify_counter, CName, Opts} = Req, _, #st{counters = Cs} = S) ->
case get_counter(CName, Cs) of
false ->
{reply, badarg, S};
#cr{} = CR ->
try CR1 = init_counter(Opts, CR),
save_req(Req),
{reply, ok, S#st{counters = update_counter(CName,Cs,CR1)}}
catch
error:_ ->
{reply, badarg, S}
end
end;
i_handle_call({delete_counter, Name} = Req, _, #st{counters = Cs} = S) ->
case get_counter(Name, Cs) of
false ->
{reply, false, S};
#cr{} ->
%% The question is whether we should also delete references
%% to the queue? It seems like we should...
Cs1 = lists:keydelete(Name, #cr.name, Cs),
save_req(Req),
{reply, true, S#st{counters = Cs1}}
end;
i_handle_call({add_counter, Name, Opts}=Req, _, #st{counters = Cs} = S) ->
case get_counter(Name, Cs) of
false ->
try CR = init_counter([{name,Name}|Opts], #cr{name = Name,
shared = true}),
CR1 = pickup_aliases(S#st.queues, CR),
save_req(Req),
{reply, ok, S#st{counters = Cs ++ [CR1]}}
catch
error:Reason ->
error_logger:error_report([{error, Reason},
{request, Req}]),
{reply, badarg, S}
end;
_ ->
{reply, badarg, S}
end;
i_handle_call({add_group_rate, Name, Opts}=Req,_, #st{group_rates = Gs} = S) ->
case get_group(Name, Gs) of
false ->
try GR = init_group(Opts, #grp{name = Name}),
save_req(Req),
{reply, ok, S#st{group_rates = Gs ++ [GR]}}
catch
error:Reason ->
error_logger:error_report([{error, Reason},
{request, Req}]),
{reply, badarg, S}
end;
_ ->
{reply, badarg, S}
end;
i_handle_call({modify_group_rate, Name, Opts} = Req,_, #st{group_rates = Gs} = S) ->
case get_group(Name, Gs) of
#grp{} = G ->
try G1 = init_group(Opts, G),
save_req(Req),
{reply, ok, S#st{group_rates = update_group(Name,Gs,G1)}}
catch
error:_ ->
{reply, badarg, S}
end;
_ ->
{reply, badarg, S}
end;
i_handle_call({ask_queue, QName, Req}, From, #st{queues = Qs} = S) ->
case get_queue(QName, Qs) of
false ->
{reply, badarg, S};
#queue{stateful = Stf} = Q ->
SetQState =
fun(Stf1) ->
S#st{queues =
lists:keyreplace(QName, #queue.name, Qs,
Q#queue{stateful = Stf1})}
end,
%% We don't catch errors; this is done at the level above.
%% One possible error is that the queue module doesn't have a
%% handle_call/3 callback.
case ask_stateful(Req, From, Stf, S#st.info_f) of
badarg -> {reply, badarg, S};
{reply, Reply, Stf1} ->
{reply, Reply, SetQState(Stf1)};
{noreply, Stf1} ->
{noreply, SetQState(Stf1)}
%% case M:handle_call(Req, From, QSt) of
%% {reply, Rep, QSt1} ->
%% {reply, Rep, SetQState(QSt1)};
%% {noreply, QSt1} ->
%% {noreply, SetQState(QSt1)}
end
end;
i_handle_call(_Req, _, S) ->
{reply, badarg, S}.
handle_cast({done, Pid, {Ref, Opaque}}, #st{monitors = Mons} = S) ->
Cs = proplists:get_value(counters, Opaque, []),
case ets:lookup(Mons, {Pid,Ref}) of
[] ->
%% huh?
io:fwrite("Didn't find monitor for Pid ~p~n", [Pid]);
[_] ->
erlang:demonitor(Ref, [flush]),
ets:delete(Mons, {Pid,Ref})
end,
{Revisit, S1} = restore_counters(Cs, S),
{noreply, revisit_queues(Revisit, S1)};
handle_cast(_Msg, S) ->
{noreply, S}.
handle_info({'DOWN', Ref, _, Pid, _}, #st{monitors = Mons} = S) ->
case ets:lookup(Mons, {Pid,Ref}) of
[{_, QName}] ->
ets:delete(Mons, {Pid,Ref}),
Cs = get_counters(QName, S), %% TODO! implement function
{Revisit, S1} = restore_counters(Cs, S),
{noreply, revisit_queues(Revisit, S1)};
[] ->
{noreply, maybe_queue_link_DOWN(Ref, S)}
end;
handle_info({revisit_queue, Name}, #st{queues = Qs} = S) ->
case get_queue(Name, Qs) of
#queue{timer = undefined} = Q ->
TS = timestamp(),
{Q1, QC, S1} = perform_queue_check(Q, TS, S),
{noreply, update_queue(Q1, QC, S1)};
_ ->
{noreply, S}
end;
handle_info({check_queue, Name}, #st{queues = Qs} = S) ->
case get_queue(Name, Qs) of
#queue{} = Q ->
TS = timestamp(),
{Q1, QC, S1} = perform_queue_check(
Q#queue{timer = undefined}, TS, S),
{noreply, update_queue(Q1, QC, S1)};
_ ->
{noreply, S}
end;
handle_info(_Msg, S) ->
io:fwrite("~p: handle_info(~p,~p)~n", [?MODULE, _Msg,S]),
{noreply, S}.
terminate(_,_) ->
ok.
code_change(_FromVsn, St, _Extra) ->
{ok, set_info(convert_queues(St))}.
convert_queues(#st{queues = Qs} = St) ->
St#st{queues = [convert_queue(Q) || Q <- Qs]}.
-spec convert_queue(#queue{} | tuple()) -> #queue{}.
convert_queue(#queue{} = Q) ->
Q;
convert_queue({queue,Name,Mod,Type,Group,Regulators,MaxTime,MaxSize,
LatestDisp,Approved,Queued,CheckInt,OldestJob,Timer,
CheckC,Empty,Depleted,Waiters,Stateful,St}) ->
%% Adding `timer_ref` default
#queue{name = Name,
mod = Mod,
type = Type,
group = Group,
regulators = Regulators,
max_time = MaxTime,
max_size = MaxSize,
latest_dispatch = LatestDisp,
approved = Approved,
queued = Queued,
check_interval = CheckInt,
oldest_job = OldestJob,
timer = Timer,
check_counter = CheckC,
empty = Empty,
depleted = Depleted,
waiters = Waiters,
stateful = Stateful,
st = St};
convert_queue({queue,Name,Mod,Type,Group,Regs,MaxT,MaxSz,
TL,Approved,Queued,CheckI,Oldest,Timer,CheckC,Waiters,
Stateful,St}) ->
#queue{name = Name,
mod = Mod,
type = Type,
group = Group,
regulators = Regs,
max_time = MaxT,
max_size = MaxSz,
latest_dispatch = TL,
approved = Approved,
queued = Queued,
check_interval = CheckI,
oldest_job = Oldest,
timer = Timer,
check_counter = CheckC,
waiters = Waiters,
stateful = Stateful,
st = St}.
%% Internal functions
get_info(all, S) ->
[{K, get_info(K, S)} || K <- [queues, group_rates, counters, monitors]];
get_info(queues, #st{queues = Qs} = S) ->
[get_queue_info(Name, S)
|| #queue{name = Name} <- Qs];
get_info(group_rates, #st{group_rates = Gs}) ->
jobs_info:pp(Gs);
get_info(counters, #st{counters = Cs}) ->
jobs_info:pp(Cs);