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%%
%% 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.
%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
-module(nouveau_fabric_info).
-export([go/3]).
-include_lib("mem3/include/mem3.hrl").
go(DbName, DDocId, IndexName) when is_binary(DDocId) ->
{ok, DDoc} = fabric:open_doc(DbName, <<"_design/", DDocId/binary>>, [ejson_body]),
go(DbName, DDoc, IndexName);
go(DbName, DDoc, IndexName) ->
{ok, Index} = nouveau_util:design_doc_to_index(DbName, DDoc, IndexName),
Shards = mem3:shards(DbName),
Counters0 = lists:map(
fun(#shard{} = Shard) ->
Ref = rexi:cast(
Shard#shard.node,
{nouveau_rpc, info, [Shard#shard.name, Index]}
),
Shard#shard{ref = Ref}
end,
Shards
),
Counters = fabric_dict:init(Counters0, nil),
Workers = fabric_dict:fetch_keys(Counters),
RexiMon = fabric_util:create_monitors(Workers),
Acc0 = {fabric_dict:init(Workers, nil), #{}},
try
fabric_util:recv(Workers, #shard.ref, fun handle_message/3, Acc0)
after
rexi_monitor:stop(RexiMon),
fabric_util:cleanup(Workers)
end.
handle_message({rexi_DOWN, _, {_, NodeRef}, _}, _Worker, {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}, Worker, {Counters, Acc}) ->
NewCounters = fabric_dict:erase(Worker, Counters),
case fabric_ring:is_progress_possible(NewCounters) of
true ->
{ok, {NewCounters, Acc}};
false ->
{error, Reason}
end;
handle_message({ok, Info}, Worker, {Counters, Acc0}) ->
case fabric_dict:lookup_element(Worker, Counters) of
undefined ->
% already heard from someone else in this range
{ok, {Counters, Acc0}};
nil ->
C1 = fabric_dict:store(Worker, ok, Counters),
C2 = fabric_view:remove_overlapping_shards(Worker, C1),
Acc1 = nouveau_maps:merge_with(fun merge_info/3, Info, Acc0),
case fabric_dict:any(nil, C2) of
true ->
{ok, {C2, Acc1}};
false ->
{stop, Acc1}
end
end;
handle_message({error, Reason}, Worker, {Counters, Acc}) ->
NewCounters = fabric_dict:erase(Worker, Counters),
case fabric_ring:is_progress_possible(NewCounters) of
true ->
{ok, {NewCounters, Acc}};
false ->
{error, Reason}
end;
handle_message({'EXIT', _}, Worker, {Counters, Acc}) ->
NewCounters = fabric_dict:erase(Worker, Counters),
case fabric_ring:is_progress_possible(NewCounters) of
true ->
{ok, {NewCounters, Acc}};
false ->
{error, {nodedown, <<"progress not possible">>}}
end.
merge_info(_Key, Val1, Val2) ->
Val1 + Val2.
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