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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (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.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is VMware, Inc.
%% Copyright (c) 2007-2012 VMware, Inc. All rights reserved.
%%
-module(rabbit_runtime_parameters).
-include("rabbit.hrl").
-export([parse_set/3, set/3, clear/2, list/0, list/1, list_formatted/0,
lookup/2, value/2, value/3, info_keys/0]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(ok_or_error_string() :: 'ok' | {'error_string', string()}).
-spec(parse_set/3 :: (binary(), binary(), string()) -> ok_or_error_string()).
-spec(set/3 :: (binary(), binary(), term()) -> ok_or_error_string()).
-spec(clear/2 :: (binary(), binary()) -> ok_or_error_string()).
-spec(list/0 :: () -> [rabbit_types:infos()]).
-spec(list/1 :: (binary()) -> [rabbit_types:infos()] | 'not_found').
-spec(list_formatted/0 :: () -> [rabbit_types:infos()]).
-spec(lookup/2 :: (binary(), binary()) -> rabbit_types:infos()).
-spec(value/2 :: (binary(), binary()) -> term()).
-spec(value/3 :: (binary(), binary(), term()) -> term()).
-spec(info_keys/0 :: () -> rabbit_types:info_keys()).
-endif.
%%---------------------------------------------------------------------------
-import(rabbit_misc, [pget/2, pset/3]).
-define(TABLE, rabbit_runtime_parameters).
%%---------------------------------------------------------------------------
parse_set(Component, Key, String) ->
case parse(String) of
{ok, Term} -> set(Component, Key, Term);
{errors, L} -> format_error(L)
end.
set(Component, Key, Term) ->
case set0(Component, Key, Term) of
ok -> ok;
{errors, L} -> format_error(L)
end.
format_error(L) ->
{error_string, rabbit_misc:format_many([{"Validation failed~n", []} | L])}.
set0(Component, Key, Term) ->
case lookup_component(Component) of
{ok, Mod} ->
case flatten_errors(validate(Term)) of
ok ->
case flatten_errors(Mod:validate(Component, Key, Term)) of
ok ->
case mnesia_update(Component, Key, Term) of
{old, Term} -> ok;
_ -> Mod:notify(Component, Key, Term)
end,
ok;
E ->
E
end;
E ->
E
end;
E ->
E
end.
mnesia_update(Component, Key, Term) ->
rabbit_misc:execute_mnesia_transaction(
fun () ->
Res = case mnesia:read(?TABLE, {Component, Key}) of
[] -> new;
[Params] -> {old, Params#runtime_parameters.value}
end,
ok = mnesia:write(?TABLE, c(Component, Key, Term), write),
Res
end).
clear(Component, Key) ->
case clear0(Component, Key) of
ok -> ok;
{errors, L} -> format_error(L)
end.
clear0(Component, Key) ->
case lookup_component(Component) of
{ok, Mod} -> case flatten_errors(Mod:validate_clear(Component, Key)) of
ok -> mnesia_clear(Component, Key),
Mod:notify_clear(Component, Key),
ok;
E -> E
end;
E -> E
end.
mnesia_clear(Component, Key) ->
ok = rabbit_misc:execute_mnesia_transaction(
fun () ->
ok = mnesia:delete(?TABLE, {Component, Key}, write)
end).
list() ->
[p(P) || P <- rabbit_misc:dirty_read_all(?TABLE)].
list(Component) ->
case lookup_component(Component) of
{ok, _} -> Match = #runtime_parameters{key = {Component, '_'}, _ = '_'},
[p(P) || P <- mnesia:dirty_match_object(?TABLE, Match)];
_ -> not_found
end.
list_formatted() ->
[pset(value, format(pget(value, P)), P) || P <- list()].
lookup(Component, Key) ->
case lookup0(Component, Key, rabbit_misc:const(not_found)) of
not_found -> not_found;
Params -> p(Params)
end.
value(Component, Key) ->
case lookup0(Component, Key, rabbit_misc:const(not_found)) of
not_found -> not_found;
Params -> Params#runtime_parameters.value
end.
value(Component, Key, Default) ->
Params = lookup0(Component, Key,
fun () -> lookup_missing(Component, Key, Default) end),
Params#runtime_parameters.value.
lookup0(Component, Key, DefaultFun) ->
case mnesia:dirty_read(?TABLE, {Component, Key}) of
[] -> DefaultFun();
[R] -> R
end.
lookup_missing(Component, Key, Default) ->
rabbit_misc:execute_mnesia_transaction(
fun () ->
case mnesia:read(?TABLE, {Component, Key}) of
[] -> Record = c(Component, Key, Default),
mnesia:write(?TABLE, Record, write),
Record;
[R] -> R
end
end).
c(Component, Key, Default) -> #runtime_parameters{key = {Component, Key},
value = Default}.
p(#runtime_parameters{key = {Component, Key}, value = Value}) ->
[{component, Component},
{key, Key},
{value, Value}].
info_keys() -> [component, key, value].
%%---------------------------------------------------------------------------
lookup_component(Component) ->
case rabbit_registry:lookup_module(
runtime_parameter, list_to_atom(binary_to_list(Component))) of
{error, not_found} -> {errors,
[{"component ~s not found", [Component]}]};
{ok, Module} -> {ok, Module}
end.
parse(Src0) ->
Src1 = string:strip(Src0),
Src = case lists:reverse(Src1) of
[$. |_] -> Src1;
_ -> Src1 ++ "."
end,
case erl_scan:string(Src) of
{ok, Scanned, _} ->
case erl_parse:parse_term(Scanned) of
{ok, Parsed} ->
{ok, Parsed};
{error, E} ->
{errors,
[{"Could not parse value: ~s", [format_parse_error(E)]}]}
end;
{error, E, _} ->
{errors, [{"Could not scan value: ~s", [format_parse_error(E)]}]}
end.
format_parse_error({_Line, Mod, Err}) ->
lists:flatten(Mod:format_error(Err)).
format(Term) ->
list_to_binary(rabbit_misc:format("~p", [Term])).
%%---------------------------------------------------------------------------
%% We will want to be able to biject these to JSON. So we have some
%% generic restrictions on what we consider acceptable.
validate(Proplist = [T | _]) when is_tuple(T) -> validate_proplist(Proplist);
validate(L) when is_list(L) -> validate_list(L);
validate(T) when is_tuple(T) -> {error, "tuple: ~p", [T]};
validate(B) when is_boolean(B) -> ok;
validate(null) -> ok;
validate(A) when is_atom(A) -> {error, "atom: ~p", [A]};
validate(N) when is_number(N) -> ok;
validate(B) when is_binary(B) -> ok;
validate(B) when is_bitstring(B) -> {error, "bitstring: ~p", [B]}.
validate_list(L) -> [validate(I) || I <- L].
validate_proplist(L) -> [vp(I) || I <- L].
vp({K, V}) when is_binary(K) -> validate(V);
vp({K, _V}) -> {error, "bad key: ~p", [K]};
vp(H) -> {error, "not two tuple: ~p", [H]}.
flatten_errors(L) ->
case [{F, A} || I <- lists:flatten([L]), {error, F, A} <- [I]] of
[] -> ok;
E -> {errors, E}
end.
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