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% Copyright 2010 Cloudant
%
% 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.
-module(fabric_db_info).
-export([go/1]).
-include("fabric.hrl").
-include_lib("mem3/include/mem3.hrl").
go(DbName) ->
Shards = mem3:shards(DbName),
Workers = fabric_util:submit_jobs(Shards, get_db_info, []),
RexiMon = fabric_util:create_monitors(Shards),
Acc0 = {fabric_dict:init(Workers, nil), []},
try
fabric_util:recv(Workers, #shard.ref, fun handle_message/3, Acc0)
after
rexi_monitor:stop(RexiMon)
end.
handle_message({rexi_DOWN, _, {_,NodeRef},_}, _Shard, {Counters, Acc}) ->
case fabric_util:remove_down_workers(Counters, NodeRef) of
{ok, NewCounters} ->
{ok, {NewCounters, Acc}};
error ->
{error, {nodedown, <<"progress not possible">>}}
end;
handle_message({rexi_EXIT, Reason}, Shard, {Counters, Acc}) ->
NewCounters = lists:keydelete(Shard,1,Counters),
case fabric_view:is_progress_possible(Counters) of
true ->
{ok, {NewCounters, Acc}};
false ->
{error, Reason}
end;
handle_message({ok, Info}, #shard{dbname=Name} = Shard, {Counters, Acc}) ->
case fabric_dict:lookup_element(Shard, Counters) of
undefined ->
% already heard from someone else in this range
{ok, {Counters, Acc}};
nil ->
Seq = couch_util:get_value(update_seq, Info),
C1 = fabric_dict:store(Shard, Seq, Counters),
C2 = fabric_view:remove_overlapping_shards(Shard, C1),
case fabric_dict:any(nil, C2) of
true ->
{ok, {C2, [Info|Acc]}};
false ->
{stop, [
{db_name,Name},
{update_seq, fabric_view_changes:pack_seqs(C2)} |
merge_results(lists:flatten([Info|Acc]))
]}
end
end;
handle_message(_, _, Acc) ->
{ok, Acc}.
merge_results(Info) ->
Dict = lists:foldl(fun({K,V},D0) -> orddict:append(K,V,D0) end,
orddict:new(), Info),
orddict:fold(fun
(doc_count, X, Acc) ->
[{doc_count, lists:sum(X)} | Acc];
(doc_del_count, X, Acc) ->
[{doc_del_count, lists:sum(X)} | Acc];
(purge_seq, X, Acc) ->
[{purge_seq, lists:sum(X)} | Acc];
(compact_running, X, Acc) ->
[{compact_running, lists:member(true, X)} | Acc];
(disk_size, X, Acc) ->
[{disk_size, lists:sum(X)} | Acc];
(other, X, Acc) ->
[{other, {merge_other_results(X)}} | Acc];
(disk_format_version, X, Acc) ->
[{disk_format_version, lists:max(X)} | Acc];
(_, _, Acc) ->
Acc
end, [{instance_start_time, <<"0">>}], Dict).
merge_other_results(Results) ->
Dict = lists:foldl(fun({Props}, D) ->
lists:foldl(fun({K,V},D0) -> orddict:append(K,V,D0) end, D, Props)
end, orddict:new(), Results),
orddict:fold(fun
(data_size, X, Acc) ->
[{data_size, lists:sum(X)} | Acc];
(_, _, Acc) ->
Acc
end, [], Dict).
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