| % 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_view_updater). |
| |
| -export([update/2]). |
| |
| -include("couch_db.hrl"). |
| |
| update(Owner, Group) -> |
| #group{ |
| db = #db{name=DbName} = Db, |
| name = GroupName, |
| current_seq = Seq, |
| purge_seq = PurgeSeq |
| } = Group, |
| couch_task_status:add_task(<<"View Group Indexer">>, <<DbName/binary," ",GroupName/binary>>, <<"Starting index update">>), |
| |
| DbPurgeSeq = couch_db:get_purge_seq(Db), |
| Group2 = |
| if DbPurgeSeq == PurgeSeq -> |
| Group; |
| DbPurgeSeq == PurgeSeq + 1 -> |
| couch_task_status:update(<<"Removing purged entries from view index.">>), |
| purge_index(Group); |
| true -> |
| couch_task_status:update(<<"Resetting view index due to lost purge entries.">>), |
| exit(reset) |
| end, |
| |
| ViewEmptyKVs = [{View, []} || View <- Group2#group.views], |
| % compute on all docs modified since we last computed. |
| TotalChanges = couch_db:count_changes_since(Db, Seq), |
| % update status every half second |
| couch_task_status:set_update_frequency(500), |
| {ok, {_,{UncomputedDocs, Group3, ViewKVsToAdd, DocIdViewIdKeys}}} |
| = couch_db:enum_docs_since( |
| Db, |
| Seq, |
| fun(DocInfo, _, {ChangesProcessed, Acc}) -> |
| couch_task_status:update("Processed ~p of ~p changes (~p%)", |
| [ChangesProcessed, TotalChanges, (ChangesProcessed*100) div TotalChanges]), |
| {ok, {ChangesProcessed+1, process_doc(Db, Owner, DocInfo, Acc)}} |
| end, |
| {0, {[], Group2, ViewEmptyKVs, []}} |
| ), |
| couch_task_status:set_update_frequency(0), |
| couch_task_status:update("Finishing."), |
| {Group4, Results} = view_compute(Group3, UncomputedDocs), |
| {ViewKVsToAdd2, DocIdViewIdKeys2} = view_insert_query_results( |
| UncomputedDocs, Results, ViewKVsToAdd, DocIdViewIdKeys), |
| couch_query_servers:stop_doc_map(Group4#group.query_server), |
| NewSeq = couch_db:get_update_seq(Db), |
| {ok, Group5} = write_changes(Group4, ViewKVsToAdd2, DocIdViewIdKeys2, |
| NewSeq), |
| exit({new_group, Group5#group{query_server=nil}}). |
| |
| |
| purge_index(#group{db=Db, views=Views, id_btree=IdBtree}=Group) -> |
| {ok, PurgedIdsRevs} = couch_db:get_last_purged(Db), |
| Ids = [Id || {Id, _Revs} <- PurgedIdsRevs], |
| {ok, Lookups, IdBtree2} = couch_btree:query_modify(IdBtree, Ids, [], Ids), |
| |
| % now populate the dictionary with all the keys to delete |
| ViewKeysToRemoveDict = lists:foldl( |
| fun({ok,{DocId,ViewNumRowKeys}}, ViewDictAcc) -> |
| lists:foldl( |
| fun({ViewNum, RowKey}, ViewDictAcc2) -> |
| dict:append(ViewNum, {RowKey, DocId}, ViewDictAcc2) |
| end, ViewDictAcc, ViewNumRowKeys); |
| ({not_found, _}, ViewDictAcc) -> |
| ViewDictAcc |
| end, dict:new(), Lookups), |
| |
| % Now remove the values from the btrees |
| Views2 = lists:map( |
| fun(#view{id_num=Num,btree=Btree}=View) -> |
| case dict:find(Num, ViewKeysToRemoveDict) of |
| {ok, RemoveKeys} -> |
| {ok, Btree2} = couch_btree:add_remove(Btree, [], RemoveKeys), |
| View#view{btree=Btree2}; |
| error -> % no keys to remove in this view |
| View |
| end |
| end, Views), |
| Group#group{id_btree=IdBtree2, |
| views=Views2, |
| purge_seq=couch_db:get_purge_seq(Db)}. |
| |
| % This fun computes once for each document |
| process_doc(Db, Owner, DocInfo, {Docs, Group, ViewKVs, DocIdViewIdKeys}) -> |
| #group{ design_options = DesignOptions } = Group, |
| |
| #doc_info{id=DocId, revs=[#rev_info{deleted=Deleted}|_]} = DocInfo, |
| IncludeDesign = proplists:get_value(<<"include_design">>, |
| DesignOptions, false), |
| LocalSeq = proplists:get_value(<<"local_seq">>, |
| DesignOptions, false), |
| DocOpts = case LocalSeq of |
| true -> |
| [conflicts, deleted_conflicts, local_seq]; |
| _ -> |
| [conflicts, deleted_conflicts] |
| end, |
| case {IncludeDesign, DocId} of |
| {false, <<?DESIGN_DOC_PREFIX, _/binary>>} -> % we skip design docs |
| {Docs, Group, ViewKVs, DocIdViewIdKeys}; |
| _ -> |
| {Docs2, DocIdViewIdKeys2} = |
| if Deleted -> |
| {Docs, [{DocId, []} | DocIdViewIdKeys]}; |
| true -> |
| {ok, Doc} = couch_db:open_doc_int(Db, DocInfo, |
| DocOpts), |
| {[Doc | Docs], DocIdViewIdKeys} |
| end, |
| |
| case couch_util:should_flush() of |
| true -> |
| {Group1, Results} = view_compute(Group, Docs2), |
| {ViewKVs3, DocIdViewIdKeys3} = view_insert_query_results(Docs2, |
| Results, ViewKVs, DocIdViewIdKeys2), |
| {ok, Group2} = write_changes(Group1, ViewKVs3, DocIdViewIdKeys3, |
| DocInfo#doc_info.high_seq), |
| if is_pid(Owner) -> |
| ok = gen_server:cast(Owner, {partial_update, self(), Group2}); |
| true -> ok end, |
| garbage_collect(), |
| ViewEmptyKeyValues = [{View, []} || View <- Group2#group.views], |
| {[], Group2, ViewEmptyKeyValues, []}; |
| false -> |
| {Docs2, Group, ViewKVs, DocIdViewIdKeys2} |
| end |
| end. |
| |
| view_insert_query_results([], [], ViewKVs, DocIdViewIdKeysAcc) -> |
| {ViewKVs, DocIdViewIdKeysAcc}; |
| view_insert_query_results([Doc|RestDocs], [QueryResults | RestResults], ViewKVs, DocIdViewIdKeysAcc) -> |
| {NewViewKVs, NewViewIdKeys} = view_insert_doc_query_results(Doc, QueryResults, ViewKVs, [], []), |
| NewDocIdViewIdKeys = [{Doc#doc.id, NewViewIdKeys} | DocIdViewIdKeysAcc], |
| view_insert_query_results(RestDocs, RestResults, NewViewKVs, NewDocIdViewIdKeys). |
| |
| |
| view_insert_doc_query_results(_Doc, [], [], ViewKVsAcc, ViewIdKeysAcc) -> |
| {lists:reverse(ViewKVsAcc), lists:reverse(ViewIdKeysAcc)}; |
| view_insert_doc_query_results(#doc{id=DocId}=Doc, [ResultKVs|RestResults], [{View, KVs}|RestViewKVs], ViewKVsAcc, ViewIdKeysAcc) -> |
| % Take any identical keys and combine the values |
| ResultKVs2 = lists:foldl( |
| fun({Key,Value}, [{PrevKey,PrevVal}|AccRest]) -> |
| case Key == PrevKey of |
| true -> |
| case PrevVal of |
| {dups, Dups} -> |
| [{PrevKey, {dups, [Value|Dups]}} | AccRest]; |
| _ -> |
| [{PrevKey, {dups, [Value,PrevVal]}} | AccRest] |
| end; |
| false -> |
| [{Key,Value},{PrevKey,PrevVal}|AccRest] |
| end; |
| (KV, []) -> |
| [KV] |
| end, [], lists:sort(ResultKVs)), |
| NewKVs = [{{Key, DocId}, Value} || {Key, Value} <- ResultKVs2], |
| NewViewKVsAcc = [{View, NewKVs ++ KVs} | ViewKVsAcc], |
| NewViewIdKeys = [{View#view.id_num, Key} || {Key, _Value} <- ResultKVs2], |
| NewViewIdKeysAcc = NewViewIdKeys ++ ViewIdKeysAcc, |
| view_insert_doc_query_results(Doc, RestResults, RestViewKVs, NewViewKVsAcc, NewViewIdKeysAcc). |
| |
| view_compute(Group, []) -> |
| {Group, []}; |
| view_compute(#group{def_lang=DefLang, query_server=QueryServerIn}=Group, Docs) -> |
| {ok, QueryServer} = |
| case QueryServerIn of |
| nil -> % doc map not started |
| Definitions = [View#view.def || View <- Group#group.views], |
| couch_query_servers:start_doc_map(DefLang, Definitions); |
| _ -> |
| {ok, QueryServerIn} |
| end, |
| {ok, Results} = couch_query_servers:map_docs(QueryServer, Docs), |
| {Group#group{query_server=QueryServer}, Results}. |
| |
| |
| |
| write_changes(Group, ViewKeyValuesToAdd, DocIdViewIdKeys, NewSeq) -> |
| #group{id_btree=IdBtree} = Group, |
| |
| AddDocIdViewIdKeys = [{DocId, ViewIdKeys} || {DocId, ViewIdKeys} <- DocIdViewIdKeys, ViewIdKeys /= []], |
| RemoveDocIds = [DocId || {DocId, ViewIdKeys} <- DocIdViewIdKeys, ViewIdKeys == []], |
| LookupDocIds = [DocId || {DocId, _ViewIdKeys} <- DocIdViewIdKeys], |
| {ok, LookupResults, IdBtree2} |
| = couch_btree:query_modify(IdBtree, LookupDocIds, AddDocIdViewIdKeys, RemoveDocIds), |
| KeysToRemoveByView = lists:foldl( |
| fun(LookupResult, KeysToRemoveByViewAcc) -> |
| case LookupResult of |
| {ok, {DocId, ViewIdKeys}} -> |
| lists:foldl( |
| fun({ViewId, Key}, KeysToRemoveByViewAcc2) -> |
| dict:append(ViewId, {Key, DocId}, KeysToRemoveByViewAcc2) |
| end, |
| KeysToRemoveByViewAcc, ViewIdKeys); |
| {not_found, _} -> |
| KeysToRemoveByViewAcc |
| end |
| end, |
| dict:new(), LookupResults), |
| |
| Views2 = [ |
| begin |
| KeysToRemove = couch_util:dict_find(View#view.id_num, KeysToRemoveByView, []), |
| {ok, ViewBtree2} = couch_btree:add_remove(View#view.btree, AddKeyValues, KeysToRemove), |
| View#view{btree = ViewBtree2} |
| end |
| || |
| {View, AddKeyValues} <- ViewKeyValuesToAdd |
| ], |
| Group2 = Group#group{views=Views2, current_seq=NewSeq, id_btree=IdBtree2}, |
| {ok, Group2}. |
| |