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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.
-module(couch_replicator_fabric).
-export([
docs/5
]).
-include_lib("fabric/include/fabric.hrl").
-include_lib("mem3/include/mem3.hrl").
-include_lib("couch/include/couch_db.hrl").
-include_lib("couch_mrview/include/couch_mrview.hrl").
docs(DbName, Options, QueryArgs, Callback, Acc) ->
Shards = mem3:shards(DbName),
Workers0 = fabric_util:submit_jobs(
Shards, couch_replicator_fabric_rpc, docs, [Options, QueryArgs]),
RexiMon = fabric_util:create_monitors(Workers0),
try
case fabric_streams:start(Workers0, #shard.ref) of
{ok, Workers} ->
try
docs_int(DbName, Workers, QueryArgs, Callback, Acc)
after
fabric_streams:cleanup(Workers)
end;
{timeout, NewState} ->
DefunctWorkers = fabric_util:remove_done_workers(
NewState#stream_acc.workers, waiting
),
fabric_util:log_timeout(
DefunctWorkers,
"replicator docs"
),
Callback({error, timeout}, Acc);
{error, Error} ->
Callback({error, Error}, Acc)
end
after
rexi_monitor:stop(RexiMon)
end.
docs_int(DbName, Workers, QueryArgs, Callback, Acc0) ->
#mrargs{limit = Limit, skip = Skip} = QueryArgs,
State = #collector{
db_name = DbName,
query_args = QueryArgs,
callback = Callback,
counters = fabric_dict:init(Workers, 0),
skip = Skip,
limit = Limit,
user_acc = Acc0,
update_seq = nil
},
case rexi_utils:recv(Workers, #shard.ref, fun handle_message/3,
State, infinity, 5000) of
{ok, NewState} ->
{ok, NewState#collector.user_acc};
{timeout, NewState} ->
Callback({error, timeout}, NewState#collector.user_acc);
{error, Resp} ->
{ok, Resp}
end.
handle_message({rexi_DOWN, _, {_, NodeRef}, _}, _, State) ->
fabric_view:check_down_shards(State, NodeRef);
handle_message({rexi_EXIT, Reason}, Worker, State) ->
fabric_view:handle_worker_exit(State, Worker, Reason);
handle_message({meta, Meta0}, {Worker, From}, State) ->
Tot = couch_util:get_value(total, Meta0, 0),
Off = couch_util:get_value(offset, Meta0, 0),
#collector{
callback = Callback,
counters = Counters0,
total_rows = Total0,
offset = Offset0,
user_acc = AccIn
} = State,
% Assert that we don't have other messages from this
% worker when the total_and_offset message arrives.
0 = fabric_dict:lookup_element(Worker, Counters0),
rexi:stream_ack(From),
Counters1 = fabric_dict:update_counter(Worker, 1, Counters0),
Total = Total0 + Tot,
Offset = Offset0 + Off,
case fabric_dict:any(0, Counters1) of
true ->
{ok, State#collector{
counters = Counters1,
total_rows = Total,
offset = Offset
}};
false ->
FinalOffset = erlang:min(Total, Offset+State#collector.skip),
Meta = [{total, Total}, {offset, FinalOffset}],
{Go, Acc} = Callback({meta, Meta}, AccIn),
{Go, State#collector{
counters = fabric_dict:decrement_all(Counters1),
total_rows = Total,
offset = FinalOffset,
user_acc = Acc
}}
end;
handle_message(#view_row{id = Id, doc = Doc} = Row0, {Worker, From}, State) ->
#collector{query_args = Args, counters = Counters0, rows = Rows0} = State,
case maybe_fetch_and_filter_doc(Id, Doc, State) of
{[_ | _]} = NewDoc ->
Row = Row0#view_row{doc = NewDoc},
Dir = Args#mrargs.direction,
Rows = merge_row(Dir, Row#view_row{worker={Worker, From}}, Rows0),
Counters1 = fabric_dict:update_counter(Worker, 1, Counters0),
State1 = State#collector{rows=Rows, counters=Counters1},
fabric_view:maybe_send_row(State1);
skip ->
rexi:stream_ack(From),
{ok, State}
end;
handle_message(complete, Worker, State) ->
Counters = fabric_dict:update_counter(Worker, 1, State#collector.counters),
fabric_view:maybe_send_row(State#collector{counters = Counters}).
merge_row(fwd, Row, Rows) ->
lists:keymerge(#view_row.id, [Row], Rows);
merge_row(rev, Row, Rows) ->
lists:rkeymerge(#view_row.id, [Row], Rows).
maybe_fetch_and_filter_doc(Id, undecided, State) ->
#collector{db_name = DbName, query_args = #mrargs{extra = Extra}} = State,
FilterStates = proplists:get_value(filter_states, Extra),
case couch_replicator:active_doc(DbName, Id) of
{ok, {Props} = DocInfo} ->
DocState = couch_util:get_value(state, Props),
couch_replicator_utils:filter_state(DocState, FilterStates, DocInfo);
{error, not_found} ->
skip % could have been deleted
end;
maybe_fetch_and_filter_doc(_Id, Doc, _State) ->
Doc.
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