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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_views_jobs).
-export([
set_timeout/0,
build_view/3,
build_view_async/2,
remove/2,
job_state/2
]).
-ifdef(TEST).
-compile(export_all).
-compile(nowarn_export_all).
-endif.
-include_lib("couch_mrview/include/couch_mrview.hrl").
-include("couch_views.hrl").
set_timeout() ->
couch_jobs:set_type_timeout(?INDEX_JOB_TYPE, 26).
build_view(TxDb, Mrst, UpdateSeq) ->
{ok, JobId} = build_view_async(TxDb, Mrst),
case wait_for_job(JobId, Mrst#mrst.idx_name, UpdateSeq) of
ok -> ok;
retry -> build_view(TxDb, Mrst, UpdateSeq)
end.
build_view_async(TxDb0, Mrst) ->
JobId = job_id(TxDb0, Mrst),
JobData = job_data(TxDb0, Mrst),
DbUUID = fabric2_db:get_uuid(TxDb0),
TxDb1 = ensure_correct_tx(TxDb0),
couch_jobs_fdb:tx(couch_jobs_fdb:get_jtx(TxDb1), fun(JTx) ->
case couch_jobs:get_job_data(JTx, ?INDEX_JOB_TYPE, JobId) of
{error, not_found} ->
ok;
{ok, #{} = OldJobData} ->
case maps:get(<<"db_uuid">>, OldJobData, undefined) of
DbUUID -> ok;
_ -> couch_jobs:remove(JTx, ?INDEX_JOB_TYPE, JobId)
end
end,
ok = couch_jobs:add(JTx, ?INDEX_JOB_TYPE, JobId, JobData)
end),
{ok, JobId}.
remove(TxDb, Sig) ->
DbName = fabric2_db:name(TxDb),
JobId = job_id(DbName, Sig),
couch_jobs:remove(TxDb, ?INDEX_JOB_TYPE, JobId).
job_state(#{} = TxDb, #mrst{} = Mrst) ->
JobId = job_id(TxDb, Mrst),
couch_jobs:get_job_state(TxDb, ?INDEX_JOB_TYPE, JobId).
ensure_correct_tx(#{tx := undefined} = TxDb) ->
TxDb;
ensure_correct_tx(#{tx := Tx} = TxDb) ->
case erlfdb:is_read_only(Tx) of
true -> TxDb#{tx := undefined};
false -> TxDb
end.
wait_for_job(JobId, DDocId, UpdateSeq) ->
case couch_jobs:subscribe(?INDEX_JOB_TYPE, JobId) of
{ok, Subscription, _State, _Data} ->
wait_for_job(JobId, Subscription, DDocId, UpdateSeq);
{ok, finished, Data} ->
case Data of
#{<<"view_seq">> := ViewSeq} when ViewSeq >= UpdateSeq ->
ok;
_ ->
retry
end
end.
wait_for_job(JobId, Subscription, DDocId, UpdateSeq) ->
case wait(Subscription) of
{not_found, not_found} ->
erlang:error(index_not_found);
{error, Error} ->
erlang:error(Error);
{finished, #{<<"error">> := <<"ddoc_deleted">>} = Data} ->
case maps:get(<<"ddoc_id">>, Data) of
DDocId ->
couch_jobs:remove(undefined, ?INDEX_JOB_TYPE, JobId),
erlang:error({ddoc_deleted, maps:get(<<"reason">>, Data)});
_OtherDocId ->
% A different design doc wiht the same signature
% was deleted. Resubmit this job which will overwrite
% the ddoc_id in the job.
retry
end;
{finished, #{<<"error">> := Error, <<"reason">> := Reason}} ->
couch_jobs:remove(undefined, ?INDEX_JOB_TYPE, JobId),
erlang:error({binary_to_existing_atom(Error, latin1), Reason});
{finished, #{<<"view_seq">> := ViewSeq}} when ViewSeq >= UpdateSeq ->
ok;
{finished, _} ->
wait_for_job(JobId, DDocId, UpdateSeq);
{_State, #{<<"view_seq">> := ViewSeq}} when ViewSeq >= UpdateSeq ->
couch_jobs:unsubscribe(Subscription),
ok;
{_, _} ->
wait_for_job(JobId, Subscription, DDocId, UpdateSeq)
end.
job_id(#{name := DbName}, #mrst{sig = Sig}) ->
job_id(DbName, Sig);
job_id(DbName, Sig) ->
HexSig = fabric2_util:to_hex(Sig),
% Put signature first in order to be able to use the no_schedule
% couch_jobs:accept/2 option
<<HexSig/binary, "-", DbName/binary>>.
job_data(Db, Mrst) ->
#mrst{
idx_name = DDocId,
sig = Sig
} = Mrst,
#{
db_name => fabric2_db:name(Db),
db_uuid => fabric2_db:get_uuid(Db),
ddoc_id => DDocId,
sig => fabric2_util:to_hex(Sig),
retries => 0
}.
wait(Subscription) ->
case couch_jobs:wait(Subscription, infinity) of
{?INDEX_JOB_TYPE, _JobId, JobState, JobData} ->
{JobState, JobData};
timeout ->
{error, timeout}
end.
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