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%%% Copyright (c) 2014-2015, NORDUnet A/S.
%%% See LICENSE for licensing information.
-module(db).
-behaviour(gen_server).
%% API.
-export([start_link/0, stop/0]).
-export([create_size_table/0]).
-export([add/2, add_entryhash/2, set_treesize/1, size/0]).
-export([add_index_nosync_noreverse/2]).
-export([verifiedsize/0, set_verifiedsize/1]).
-export([sendsth_verified/0, set_sendsth_verified/2]).
-export([get_by_index/1, get_by_indices/3, get_by_leaf_hash/1]).
-export([get_by_entry_hash/1, entry_for_leafhash/1, leafhash_for_index/1]).
-export([leafhash_for_indices/2, indexsize/0]).
-export([indexforhash_nosync/2, indexforhash_dosync/0, index_sync/0]).
%% gen_server callbacks.
-export([init/1, handle_call/3, terminate/2, handle_cast/2, handle_info/2,
code_change/3]).
-import(stacktrace, [call/2]).
-include_lib("stdlib/include/qlc.hrl").
-include("db.hrl").
-define(DB_SIZE_TABLE, db_size).
size() ->
[{_, Size}] = ets:lookup(?DB_SIZE_TABLE, db_size),
Size.
verifiedsize() ->
binary_to_integer(atomic:readfile(verifiedsize_path())).
sendsth_verified() ->
case atomic:readfile(sendsth_verified_path()) of
noentry ->
-1;
Contents ->
{struct, PropList} = mochijson2:decode(Contents),
Index = proplists:get_value(<<"index">>, PropList),
HashHex = proplists:get_value(<<"hash">>, PropList),
Hash = mochihex:to_bin(binary_to_list(HashHex)),
HashFromDB = leafhash_for_index(Index),
case Hash of
HashFromDB ->
Index;
_ ->
lager:error("~p corrupt: contained ~p:~p, but real hash is ~p", [sendsth_verified_path(), Index, Hash, HashFromDB]),
-1
end
end.
indexsize() ->
index:indexsize(index_path()).
init(_Args) ->
{ok, []}.
create_size_table() ->
case ets:info(?DB_SIZE_TABLE) of
undefined ->
ok;
_ ->
ets:delete(?DB_SIZE_TABLE)
end,
ets:new(?DB_SIZE_TABLE, [set, public, named_table]).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
stop() ->
call(?MODULE, stop).
%%%%%%%%%%%%%%%%%%%%
%% Public API.
-spec add(binary(), binary()) -> ok.
add(LeafHash, Data) ->
lager:debug("add leafhash ~s", [mochihex:to_hex(LeafHash)]),
ok = perm:addvalue(entry_db, LeafHash, Data),
perm:commit(entry_db),
lager:debug("leafhash ~s added", [mochihex:to_hex(LeafHash)]),
ok.
-spec add_entryhash(binary(), binary()) -> ok | differ.
add_entryhash(LeafHash, EntryHash) ->
perm:addvalue(entryhash_db, EntryHash, LeafHash).
-spec add_index_nosync_noreverse(binary(), non_neg_integer()) -> ok.
add_index_nosync_noreverse(LeafHash, Index) ->
call(?MODULE, {add_index_nosync_noreverse, {LeafHash, Index}}).
-spec set_treesize(non_neg_integer()) -> ok.
set_treesize(Size) ->
true = ets:insert(?DB_SIZE_TABLE, {db_size, Size}),
ok.
-spec set_verifiedsize(non_neg_integer()) -> ok.
set_verifiedsize(Size) ->
ok = atomic:replacefile(verifiedsize_path(), integer_to_binary(Size)).
-spec set_sendsth_verified(non_neg_integer(), binary()) -> ok.
set_sendsth_verified(Index, Hash) ->
Contents = mochijson2:encode(
{[{index, Index},
{hash, list_to_binary(mochihex:to_hex(Hash))}
]}),
ok = atomic:replacefile(sendsth_verified_path(), Contents).
-spec get_by_indices(integer(), integer(), {sorted, true|false}) ->
[{non_neg_integer(), binary(), notfetched}].
get_by_indices(Start, End, {sorted, _Sorted}) ->
get_by_indices_helper(Start, End).
-spec get_by_index(non_neg_integer()) ->
{non_neg_integer(), binary(), noentry | binary()}.
get_by_index(Index) ->
LeafHash = leafhash_for_index(Index),
Entry = entry_for_leafhash(LeafHash),
{Index, LeafHash, Entry}.
-spec get_by_leaf_hash(binary()) -> notfound |
{non_neg_integer(), binary(), binary()}.
get_by_leaf_hash(LeafHash) ->
case entry_for_leafhash(LeafHash) of
noentry ->
notfound;
Entry ->
case index_for_leafhash(LeafHash) of
noentry ->
notfound;
Index ->
{Index, LeafHash, Entry}
end
end.
-spec get_by_entry_hash(binary()) -> notfound | {notfetched, binary(), binary()}.
get_by_entry_hash(EntryHash) ->
case leafhash_for_entryhash(EntryHash) of
noentry ->
notfound;
LeafHash ->
case entry_for_leafhash(LeafHash) of
noentry ->
notfound;
Entry ->
%% Don't fetch index, isn't used and might not exist
{notfetched, LeafHash, Entry}
end
end.
%%%%%%%%%%%%%%%%%%%%
%% gen_server callbacks.
handle_cast(_Request, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
terminate(_Reason, _State) ->
io:format("~p terminating~n", [?MODULE]),
ok.
%%%%%%%%%%%%%%%%%%%%
%% The meat.
% Table for Index -> Leaf hash
index_path() ->
{ok, Value} = application:get_env(plop, index_path),
Value.
% File that stores the number of verified entries
verifiedsize_path() ->
{ok, Value} = application:get_env(plop, verifiedsize_path),
Value.
% File that stores how far sendsth has verified entries
sendsth_verified_path() ->
{ok, Value} = application:get_env(plop, sendsth_verified_path),
Value.
entry_for_leafhash(LeafHash) ->
perm:getvalue(entry_db, LeafHash).
index_for_leafhash(LeafHash) ->
case perm:getvalue(indexforhash_db, LeafHash) of
noentry ->
noentry;
Index ->
binary_to_integer(Index)
end.
leafhash_for_index(Index) ->
index:get(index_path(), Index).
leafhash_for_indices(Start, End) ->
index:getrange(index_path(), Start, End).
leafhash_for_entryhash(EntryHash) ->
perm:getvalue(entryhash_db, EntryHash).
get_by_indices_helper(Start, _End) when Start < 0 ->
[];
get_by_indices_helper(Start, End) ->
EndBound = min(End, indexsize() - 1),
case Start =< EndBound of
true ->
lists:map(fun ({LeafHash, Index}) ->
{Index, LeafHash, notfetched}
end, lists:zip(leafhash_for_indices(Start, EndBound),
lists:seq(Start, EndBound)));
false ->
[]
end.
handle_call(stop, _From, State) ->
{stop, normal, stopped, State};
handle_call({add_index_nosync_noreverse, {LeafHash, Index}}, _From, State) ->
ok = index:add_nosync(index_path(), Index, LeafHash),
{reply, ok, State}.
indexforhash_nosync(LeafHash, Index) ->
ok = perm:addvalue(indexforhash_db,
LeafHash, integer_to_binary(Index)),
ok.
indexforhash_dosync() ->
perm:commit(indexforhash_db, 300000),
ok.
index_sync() ->
Basepath = index_path(),
ok = util:fsync([Basepath, filename:dirname(Basepath)]),
ok.
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