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|
-module(fabric_db).
-author('Brad Anderson <brad@cloudant.com>').
-author('Adam Kocoloski <adam@cloudant.com>').
-export([all_databases/1, get_db_info/2, create_db/2, delete_db/2]).
-include("../../couch/src/couch_db.hrl").
-include("../../dynomite/include/membership.hrl").
%% @doc gets all databases in the cluster.
-spec all_databases(binary() | []) -> [binary()].
all_databases([]) ->
Dbs = ets:foldl(fun(#shard{dbname=DbName}, AccIn) ->
new_acc(DbName, AccIn)
end, [], partitions),
{ok, Dbs};
all_databases(Customer) ->
?debugFmt("~nCustomer: ~p~n", [Customer]),
Dbs = ets:foldl(fun(#shard{dbname=DbName}, AccIn) ->
DbNameStr = ?b2l(DbName),
case string:str(DbNameStr, Customer) of
1 ->
new_acc(DbNameStr, AccIn);
_ -> AccIn
end
end, [], dbs_cache),
{ok, Dbs}.
%% @doc get database information tuple
get_db_info(DbName, Customer) ->
Name = cloudant_db_name(Customer, DbName),
Shards = partitions:all_parts(DbName),
Workers = fabric_util:submit_jobs(Shards, get_db_info, []),
Acc0 = {false, length(Workers), lists:usort([ {Beg, nil} ||
#shard{range=[Beg,_]} <- Workers])},
case fabric_util:recv(Workers, #shard.ref, fun handle_info_msg/3, Acc0) of
{ok, ShardInfos} ->
{ok, process_infos(ShardInfos, [{db_name, Name}])};
Error -> Error
end.
%% @doc Create a new database, and all its partition files across the cluster
%% Options is proplist with user_ctx, n, q
-spec create_db(binary(), list()) -> {ok, #db{}} | {error, any()}.
create_db(DbName, Options) ->
Fullmap = partitions:fullmap(DbName, Options),
{ok, FullNodes} = mem3:fullnodes(),
RefPartMap = send_create_calls(Fullmap, Options),
Acc0 = {false, length(RefPartMap), lists:usort([ {Beg, false} ||
{_,#shard{range=[Beg,_]}} <- RefPartMap])},
Result = case fabric_util:receive_loop(
RefPartMap, 1, fun handle_create_msg/3, Acc0) of
{ok, _Results} -> ok;
Error -> Error
end,
% always install partition map, even w/ errors, so delete is possible
partitions:install_fullmap(DbName, Fullmap, FullNodes, Options),
Result.
%% @doc Delete a database, and all its partition files across the cluster
%% Options is proplist with user_ctx, n, q
-spec delete_db(binary(), list()) -> {ok, #db{}} | {error, any()}.
delete_db(DbName, Options) ->
Fullmap = partitions:all_parts(DbName),
RefPartMap = send_delete_calls(Fullmap, Options),
Acc0 = {true, length(RefPartMap)},
case fabric_util:receive_loop(
RefPartMap, 1, fun handle_delete_msg/3, Acc0) of
{ok, _Results} ->
delete_fullmap(DbName),
ok;
Error -> Error
end.
%% =====================
%% internal
%% =====================
new_acc(DbName, Acc) ->
case lists:member(DbName, Acc) of
true -> Acc;
_ ->[DbName | Acc]
end.
handle_info_msg(_, _, {true, _, Infos0}) ->
{stop, Infos0};
handle_info_msg(_, _, {false, 1, Infos0}) ->
MissingShards = lists:reverse(lists:foldl(fun
({S,nil}, Acc) -> [S|Acc];
(_, Acc) -> Acc
end, [], Infos0)),
?LOG_ERROR("get_db_info error, missing shards: ~p", [MissingShards]),
{error, get_db_info};
handle_info_msg(#shard{range=[Beg,_]}, {ok, Info}, {false, N, Infos0}) ->
case couch_util:get_value(Beg, Infos0) of
nil ->
Infos = lists:keyreplace(Beg, 1, Infos0, {Beg, Info}),
case is_complete(info, Infos) of
true -> {ok, {true, N-1, Infos}};
false -> {ok, {false, N-1, Infos}}
end;
_ ->
{ok, {false, N-1, Infos0}}
end;
handle_info_msg(_, _Other, {Complete, N, Infos0}) ->
{ok, {Complete, N-1, Infos0}}.
is_complete(info, List) ->
not lists:any(fun({_,Info}) -> Info =:= nil end, List);
is_complete(create, List) ->
lists:all(fun({_,Bool}) -> Bool end, List).
cloudant_db_name(Customer, FullName) ->
case Customer of
"" -> FullName;
Name -> re:replace(FullName, [Name,"/"], "", [{return, binary}])
end.
%% Loop through Tasks on the flattened Infos and get the aggregated result
process_infos(Infos, Initial) ->
Tasks = [
{doc_count, fun sum/2, 0},
{doc_del_count, fun sum/2, 0},
{update_seq, fun max/2, 1},
{purge_seq, fun sum/2, 0},
{compact_running, fun bool/2, 0},
{disk_size, fun sum/2, 0},
{instance_start_time, fun(_, _) -> <<"0">> end, 0},
{disk_format_version, fun max/2, 0}],
Infos1 = lists:flatten(Infos),
Result = lists:map(fun({Type, Fun, Default}) ->
{Type, process_info(Type, Fun, Default, Infos1)}
end, Tasks),
lists:flatten([Initial, Result]).
process_info(Type, Fun, Default, List) ->
lists:foldl(fun(V, AccIn) -> Fun(V, AccIn) end, Default,
proplists:get_all_values(Type, List)).
sum(New, Existing) ->
New + Existing.
bool(New, Existing) ->
New andalso Existing.
max(New, Existing) ->
case New > Existing of
true -> New;
false -> Existing
end.
%% @doc create the partitions on all appropriate nodes (rexi calls)
-spec send_create_calls(fullmap(), list()) -> [{reference(), part()}].
send_create_calls(Fullmap, Options) ->
lists:map(fun(#shard{node=Node, name=ShardName} = Part) ->
Ref = rexi:async_server_call({couch_server, Node},
{create, ShardName, Options}),
{Ref, Part}
end, Fullmap).
handle_create_msg(_, file_exists, _) ->
{error, file_exists};
handle_create_msg(_, {rexi_EXIT, _Reason}, {Complete, N, Parts}) ->
{ok, {Complete, N-1, Parts}};
handle_create_msg(_, {rexi_DOWN, _, _, _}, {Complete, _N, _Parts}) ->
if
Complete -> {stop, ok};
true -> {error, create_db_fubar}
end;
handle_create_msg(_, _, {true, 1, _Acc}) ->
{stop, ok};
handle_create_msg({_, #shard{range=[Beg,_]}}, {ok, _}, {false, 1, PartResults0}) ->
PartResults = lists:keyreplace(Beg, 1, PartResults0, {Beg, true}),
case is_complete(create, PartResults) of
true -> {stop, ok};
false -> {error, create_db_fubar}
end;
handle_create_msg(_RefPart, {ok, _}, {true, N, Parts}) ->
{ok, {true, N-1, Parts}};
handle_create_msg({_Ref, #shard{range=[Beg,_]}}, {ok, _}, {false, Rem, PartResults0}) ->
PartResults = lists:keyreplace(Beg, 1, PartResults0, {Beg, true}),
{ok, {is_complete(create, PartResults), Rem-1, PartResults}}.
%% @doc delete the partitions on all appropriate nodes (rexi calls)
-spec send_delete_calls(fullmap(), list()) -> [{reference(), part()}].
send_delete_calls(Parts, Options) ->
lists:map(fun(#shard{node=Node, name=ShardName} = Part) ->
Ref = rexi:async_server_call({couch_server, Node},
{delete, ShardName, Options}),
{Ref, Part}
end, Parts).
handle_delete_msg(_, not_found, {NotFound, N}) ->
{ok, {NotFound, N-1}};
handle_delete_msg(_, {rexi_EXIT, _Reason}, {NotFound, N}) ->
{ok, {NotFound, N-1}};
handle_delete_msg(_, {rexi_DOWN, _, _, _}, _Acc) ->
{error, delete_db_fubar};
handle_delete_msg(_, _, {NotFound, 1}) ->
if
NotFound -> {stop, not_found};
true -> {stop, ok}
end;
handle_delete_msg(_, ok, {_NotFound, N}) ->
{ok, {false, N-1}}.
delete_fullmap(DbName) ->
case couch_db:open(<<"dbs">>, []) of
{ok, Db} ->
{ok, Doc} = couch_api:open_doc(Db, DbName, nil, []),
couch_api:update_doc(Db, Doc#doc{deleted=true});
Error -> Error
end.
|
