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Diffstat (limited to 'lib/dialyzer/test/r9c_tests_SUITE_data/src/mnesia/mnesia_snmp_hook.erl')
| -rw-r--r-- | lib/dialyzer/test/r9c_tests_SUITE_data/src/mnesia/mnesia_snmp_hook.erl | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/lib/dialyzer/test/r9c_tests_SUITE_data/src/mnesia/mnesia_snmp_hook.erl b/lib/dialyzer/test/r9c_tests_SUITE_data/src/mnesia/mnesia_snmp_hook.erl new file mode 100644 index 0000000000..458323c0e4 --- /dev/null +++ b/lib/dialyzer/test/r9c_tests_SUITE_data/src/mnesia/mnesia_snmp_hook.erl @@ -0,0 +1,271 @@ +%% ``The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved via the world wide web at http://www.erlang.org/. +%% +%% 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 Initial Developer of the Original Code is Ericsson Utvecklings AB. +%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings +%% AB. All Rights Reserved.'' +%% +%% $Id: mnesia_snmp_hook.erl,v 1.1 2008/12/17 09:53:39 mikpe Exp $ +%% +-module(mnesia_snmp_hook). + +%% Hooks (called from mnesia) +-export([check_ustruct/1, create_table/3, delete_table/2, + key_to_oid/3, update/1, start/2, + get_row/2, get_next_index/2, get_mnesia_key/2]). + +%% sys callback functions +-export([system_continue/3, + system_terminate/4, + system_code_change/4 + ]). + +%% Internal exports +-export([b_init/2]). + +check_ustruct([]) -> + true; %% default value, not SNMP'ified +check_ustruct([{key, Types}]) -> + is_snmp_type(to_list(Types)); +check_ustruct(_) -> false. + +to_list(Tuple) when tuple(Tuple) -> tuple_to_list(Tuple); +to_list(X) -> [X]. + +is_snmp_type([integer | T]) -> is_snmp_type(T); +is_snmp_type([string | T]) -> is_snmp_type(T); +is_snmp_type([fix_string | T]) -> is_snmp_type(T); +is_snmp_type([]) -> true; +is_snmp_type(_) -> false. + +create_table([], MnesiaTab, _Storage) -> + mnesia:abort({badarg, MnesiaTab, {snmp, empty_snmpstruct}}); + +create_table([{key, Us}], MnesiaTab, Storage) -> + Tree = b_new(MnesiaTab, Us), + mnesia_lib:db_fixtable(Storage, MnesiaTab, true), + First = mnesia_lib:db_first(Storage, MnesiaTab), + build_table(First, MnesiaTab, Tree, Us, Storage), + mnesia_lib:db_fixtable(Storage, MnesiaTab, false), + Tree. + +build_table(MnesiaKey, MnesiaTab, Tree, Us, Storage) + when MnesiaKey /= '$end_of_table' -> +%% SnmpKey = key_to_oid(MnesiaTab, MnesiaKey, Us), +%% update(write, Tree, MnesiaKey, SnmpKey), + update(write, Tree, MnesiaKey, MnesiaKey), + Next = mnesia_lib:db_next_key(Storage, MnesiaTab, MnesiaKey), + build_table(Next, MnesiaTab, Tree, Us, Storage); +build_table('$end_of_table', _MnesiaTab, _Tree, _Us, _Storage) -> + ok. + +delete_table(_MnesiaTab, Tree) -> + exit(Tree, shutdown), + ok. + +%%----------------------------------------------------------------- +%% update({Op, MnesiaTab, MnesiaKey, SnmpKey}) +%%----------------------------------------------------------------- + +update({clear_table, MnesiaTab}) -> + Tree = mnesia_lib:val({MnesiaTab, {index, snmp}}), + b_clear(Tree); + +update({Op, MnesiaTab, MnesiaKey, SnmpKey}) -> + Tree = mnesia_lib:val({MnesiaTab, {index, snmp}}), + update(Op, Tree, MnesiaKey, SnmpKey). + +update(Op, Tree, MnesiaKey, _) -> + case Op of + write -> + b_insert(Tree, MnesiaKey, MnesiaKey); + update_counter -> + ignore; + delete -> + b_delete(Tree, MnesiaKey); + delete_object -> + b_delete(Tree, MnesiaKey) + end, + ok. + +%%----------------------------------------------------------------- +%% Func: key_to_oid(Tab, Key, Ustruct) +%% Args: Key ::= key() +%% key() ::= int() | string() | {int() | string()} +%% Type ::= {fix_string | term()} +%% Make an OBJECT IDENTIFIER out of it. +%% Variable length objects are prepended by their length. +%% Ex. Key = {"pelle", 42} AND Type = {string, integer} => +%% OID [5, $p, $e, $l, $l, $e, 42] +%% Key = {"pelle", 42} AND Type = {fix_string, integer} => +%% OID [$p, $e, $l, $l, $e, 42] +%%----------------------------------------------------------------- +key_to_oid(Tab, Key, [{key, Types}]) -> + MnesiaOid = {Tab, Key}, + if + tuple(Key), tuple(Types) -> + case {size(Key), size(Types)} of + {Size, Size} -> + keys_to_oid(MnesiaOid, Size, Key, [], Types); + _ -> + exit({bad_snmp_key, MnesiaOid}) + end; + true -> + key_to_oid_i(MnesiaOid, Key, Types) + end. + +key_to_oid_i(_MnesiaOid, Key, integer) when integer(Key) -> [Key]; +key_to_oid_i(_MnesiaOid, Key, fix_string) when list(Key) -> Key; +key_to_oid_i(_MnesiaOid, Key, string) when list(Key) -> [length(Key) | Key]; +key_to_oid_i(MnesiaOid, Key, Type) -> + exit({bad_snmp_key, [MnesiaOid, Key, Type]}). + +keys_to_oid(_MnesiaOid, 0, _Key, Oid, _Types) -> Oid; +keys_to_oid(MnesiaOid, N, Key, Oid, Types) -> + Type = element(N, Types), + KeyPart = element(N, Key), + Oid2 = key_to_oid_i(MnesiaOid, KeyPart, Type) ++ Oid, + keys_to_oid(MnesiaOid, N-1, Key, Oid2, Types). + +%%----------------------------------------------------------------- +%% Func: get_row/2 +%% Args: Name is the name of the table (atom) +%% RowIndex is an Oid +%% Returns: {ok, Row} | undefined +%% Note that the Row returned might contain columns that +%% are not visible via SNMP. e.g. the first column may be +%% ifIndex, and the last MFA ({ifIndex, col1, col2, MFA}). +%% where ifIndex is used only as index (not as a real col), +%% and MFA as extra info, used by the application. +%%----------------------------------------------------------------- +get_row(Name, RowIndex) -> + Tree = mnesia_lib:val({Name, {index, snmp}}), + case b_lookup(Tree, RowIndex) of + {ok, {_RowIndex, Key}} -> + [Row] = mnesia:dirty_read({Name, Key}), + {ok, Row}; + _ -> + undefined + end. + +%%----------------------------------------------------------------- +%% Func: get_next_index/2 +%% Args: Name is the name of the table (atom) +%% RowIndex is an Oid +%% Returns: {ok, NextIndex} | endOfTable +%%----------------------------------------------------------------- +get_next_index(Name, RowIndex) -> + Tree = mnesia_lib:val({Name, {index, snmp}}), + case b_lookup_next(Tree, RowIndex) of + {ok, {NextIndex, _Key}} -> + {ok, NextIndex}; + _ -> + endOfTable + end. + +%%----------------------------------------------------------------- +%% Func: get_mnesia_key/2 +%% Purpose: Get the mnesia key corresponding to the RowIndex. +%% Args: Name is the name of the table (atom) +%% RowIndex is an Oid +%% Returns: {ok, Key} | undefiend +%%----------------------------------------------------------------- +get_mnesia_key(Name, RowIndex) -> + Tree = mnesia_lib:val({Name, {index, snmp}}), + case b_lookup(Tree, RowIndex) of + {ok, {_RowIndex, Key}} -> + {ok, Key}; + _ -> + undefined + end. + +%%----------------------------------------------------------------- +%% Encapsulate a bplus_tree in a process. +%%----------------------------------------------------------------- + +b_new(MnesiaTab, Us) -> + case supervisor:start_child(mnesia_snmp_sup, [MnesiaTab, Us]) of + {ok, Tree} -> + Tree; + {error, Reason} -> + exit({badsnmp, MnesiaTab, Reason}) + end. + +start(MnesiaTab, Us) -> + Name = {mnesia_snmp, MnesiaTab}, + mnesia_monitor:start_proc(Name, ?MODULE, b_init, [self(), Us]). + +b_insert(Tree, Key, Val) -> Tree ! {insert, Key, Val}. +b_delete(Tree, Key) -> Tree ! {delete, Key}. +b_lookup(Tree, Key) -> + Tree ! {lookup, self(), Key}, + receive + {bplus_res, Res} -> + Res + end. +b_lookup_next(Tree, Key) -> + Tree ! {lookup_next, self(), Key}, + receive + {bplus_res, Res} -> + Res + end. + +b_clear(Tree) -> + Tree ! clear, + ok. + +b_init(Parent, Us) -> + %% Do not trap exit + Tree = snmp_index:new(Us), + proc_lib:init_ack(Parent, {ok, self()}), + b_loop(Parent, Tree, Us). + +b_loop(Parent, Tree, Us) -> + receive + {insert, Key, Val} -> + NTree = snmp_index:insert(Tree, Key, Val), + b_loop(Parent, NTree, Us); + {delete, Key} -> + NTree = snmp_index:delete(Tree, Key), + b_loop(Parent, NTree, Us); + {lookup, From, Key} -> + Res = snmp_index:get(Tree, Key), + From ! {bplus_res, Res}, + b_loop(Parent, Tree, Us); + {lookup_next, From, Key} -> + Res = snmp_index:get_next(Tree, Key), + From ! {bplus_res, Res}, + b_loop(Parent, Tree, Us); + clear -> + catch snmp_index:delete(Tree), %% Catch because delete/1 is not + NewTree = snmp_index:new(Us), %% available in old snmp (before R5) + b_loop(Parent, NewTree, Us); + + {'EXIT', Parent, Reason} -> + exit(Reason); + + {system, From, Msg} -> + mnesia_lib:dbg_out("~p got {system, ~p, ~p}~n", [?MODULE, From, Msg]), + sys:handle_system_msg(Msg, From, Parent, ?MODULE, [], {Tree, Us}) + + end. + +%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% System upgrade + +system_continue(Parent, _Debug, {Tree, Us}) -> + b_loop(Parent, Tree, Us). + +system_terminate(Reason, _Parent, _Debug, _Tree) -> + exit(Reason). + +system_code_change(State, _Module, _OldVsn, _Extra) -> + {ok, State}. |