| % 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(chttpd_changes). |
| -include_lib("couch/include/couch_db.hrl"). |
| -include_lib("couch_mrview/include/couch_mrview.hrl"). |
| |
| -export([ |
| handle_db_changes/3, |
| get_changes_timeout/2, |
| wait_updated/3, |
| get_rest_updated/1, |
| configure_filter/4, |
| filter/3, |
| handle_db_event/3, |
| handle_view_event/3, |
| send_changes_doc_ids/6, |
| send_changes_design_docs/6 |
| ]). |
| |
| -export([changes_enumerator/2]). |
| |
| %% export so we can use fully qualified call to facilitate hot-code upgrade |
| -export([ |
| keep_sending_changes/3 |
| ]). |
| |
| -record(changes_acc, { |
| db, |
| seq, |
| prepend, |
| filter, |
| callback, |
| user_acc, |
| resp_type, |
| limit, |
| include_docs, |
| doc_options, |
| conflicts, |
| timeout, |
| timeout_fun, |
| aggregation_kvs, |
| aggregation_results |
| }). |
| |
| handle_db_changes(Args0, Req, Db0) -> |
| #changes_args{ |
| style = Style, |
| filter = FilterName, |
| feed = Feed, |
| dir = Dir, |
| since = Since |
| } = Args0, |
| Filter = configure_filter(FilterName, Style, Req, Db0), |
| Args = Args0#changes_args{filter_fun = Filter}, |
| DbName = fabric2_db:name(Db0), |
| StartListenerFun = fun() -> |
| fabric2_events:link_listener( |
| ?MODULE, handle_db_event, self(), [{dbname, DbName}] |
| ) |
| end, |
| Start = fun() -> |
| StartSeq = case Dir =:= rev orelse Since =:= now of |
| true -> fabric2_db:get_update_seq(Db0); |
| false -> Since |
| end, |
| {Db0, StartSeq} |
| end, |
| % begin timer to deal with heartbeat when filter function fails |
| case Args#changes_args.heartbeat of |
| undefined -> |
| erlang:erase(last_changes_heartbeat); |
| Val when is_integer(Val); Val =:= true -> |
| put(last_changes_heartbeat, os:timestamp()) |
| end, |
| |
| case lists:member(Feed, ["continuous", "longpoll", "eventsource"]) of |
| true -> |
| fun(CallbackAcc) -> |
| {Callback, UserAcc} = get_callback_acc(CallbackAcc), |
| {ok, Listener} = StartListenerFun(), |
| |
| {Db, StartSeq} = Start(), |
| UserAcc2 = start_sending_changes(Callback, UserAcc), |
| {Timeout, TimeoutFun} = get_changes_timeout(Args, Callback), |
| Acc0 = build_acc(Args, Callback, UserAcc2, Db, StartSeq, |
| <<"">>, Timeout, TimeoutFun), |
| try |
| keep_sending_changes( |
| Args#changes_args{dir=fwd}, |
| Acc0, |
| true) |
| after |
| fabric2_events:stop_listener(Listener), |
| get_rest_updated(ok) % clean out any remaining update messages |
| end |
| end; |
| false -> |
| fun(CallbackAcc) -> |
| {Callback, UserAcc} = get_callback_acc(CallbackAcc), |
| UserAcc2 = start_sending_changes(Callback, UserAcc), |
| {Timeout, TimeoutFun} = get_changes_timeout(Args, Callback), |
| {Db, StartSeq} = Start(), |
| Acc0 = build_acc(Args#changes_args{feed="normal"}, Callback, |
| UserAcc2, Db, StartSeq, <<>>, |
| Timeout, TimeoutFun), |
| {ok, #changes_acc{seq = LastSeq, user_acc = UserAcc3}} = |
| send_changes( |
| Acc0, |
| Dir, |
| true), |
| end_sending_changes(Callback, UserAcc3, LastSeq) |
| end |
| end. |
| |
| |
| handle_db_event(_DbName, updated, Parent) -> |
| Parent ! updated, |
| {ok, Parent}; |
| handle_db_event(_DbName, deleted, Parent) -> |
| Parent ! deleted, |
| {ok, Parent}; |
| handle_db_event(_DbName, _Event, Parent) -> |
| {ok, Parent}. |
| |
| |
| handle_view_event(_DbName, Msg, {Parent, DDocId}) -> |
| case Msg of |
| {index_commit, DDocId} -> |
| Parent ! updated; |
| {index_delete, DDocId} -> |
| Parent ! deleted; |
| _ -> |
| ok |
| end, |
| {ok, {Parent, DDocId}}. |
| |
| get_callback_acc({Callback, _UserAcc} = Pair) when is_function(Callback, 2) -> |
| Pair; |
| get_callback_acc(Callback) when is_function(Callback, 1) -> |
| {fun(Ev, _) -> Callback(Ev) end, ok}. |
| |
| |
| configure_filter(Filter, _Style, _Req, _Db) when is_tuple(Filter) -> |
| % Filter has already been configured |
| Filter; |
| configure_filter("_doc_ids", Style, Req, _Db) -> |
| {doc_ids, Style, get_doc_ids(Req)}; |
| configure_filter("_selector", Style, Req, _Db) -> |
| {selector, Style, get_selector_and_fields(Req)}; |
| configure_filter("_design", Style, _Req, _Db) -> |
| {design_docs, Style}; |
| configure_filter("_view", Style, Req, Db) -> |
| ViewName = get_view_qs(Req), |
| if ViewName /= "" -> ok; true -> |
| throw({bad_request, "`view` filter parameter is not provided."}) |
| end, |
| ViewNameParts = string:tokens(ViewName, "/"), |
| case [?l2b(couch_httpd:unquote(Part)) || Part <- ViewNameParts] of |
| [DName, VName] -> |
| {ok, DDoc} = open_ddoc(Db, <<"_design/", DName/binary>>), |
| check_member_exists(DDoc, [<<"views">>, VName]), |
| case fabric2_db:is_clustered(Db) of |
| true -> |
| DIR = fabric_util:doc_id_and_rev(DDoc), |
| {fetch, view, Style, DIR, VName}; |
| false -> |
| {view, Style, DDoc, VName} |
| end; |
| [] -> |
| Msg = "`view` must be of the form `designname/viewname`", |
| throw({bad_request, Msg}) |
| end; |
| configure_filter([$_ | _], _Style, _Req, _Db) -> |
| throw({bad_request, "unknown builtin filter name"}); |
| configure_filter("", main_only, _Req, _Db) -> |
| {default, main_only}; |
| configure_filter("", all_docs, _Req, _Db) -> |
| {default, all_docs}; |
| configure_filter(FilterName, Style, Req, Db) -> |
| FilterNameParts = string:tokens(FilterName, "/"), |
| case [?l2b(couch_httpd:unquote(Part)) || Part <- FilterNameParts] of |
| [DName, FName] -> |
| {ok, DDoc} = open_ddoc(Db, <<"_design/", DName/binary>>), |
| check_member_exists(DDoc, [<<"filters">>, FName]), |
| {custom, Style, Req, DDoc, FName}; |
| [] -> |
| {default, Style}; |
| _Else -> |
| Msg = "`filter` must be of the form `designname/filtername`", |
| throw({bad_request, Msg}) |
| end. |
| |
| |
| filter(Db, Change, {default, Style}) -> |
| apply_style(Db, Change, Style); |
| filter(Db, Change, {doc_ids, Style, DocIds}) -> |
| case lists:member(maps:get(id, Change), DocIds) of |
| true -> |
| apply_style(Db, Change, Style); |
| false -> |
| [] |
| end; |
| filter(Db, Change, {selector, Style, {Selector, _Fields}}) -> |
| Docs = open_revs(Db, Change, Style), |
| Passes = [mango_selector:match(Selector, couch_doc:to_json_obj(Doc, [])) |
| || Doc <- Docs], |
| filter_revs(Passes, Docs); |
| filter(Db, Change, {design_docs, Style}) -> |
| case maps:get(id, Change) of |
| <<"_design", _/binary>> -> |
| apply_style(Db, Change, Style); |
| _ -> |
| [] |
| end; |
| filter(Db, Change, {view, Style, DDoc, VName}) -> |
| Docs = open_revs(Db, Change, Style), |
| {ok, Passes} = couch_query_servers:filter_view(DDoc, VName, Docs), |
| filter_revs(Passes, Docs); |
| filter(Db, Change, {custom, Style, Req0, DDoc, FName}) -> |
| Req = case Req0 of |
| {json_req, _} -> Req0; |
| #httpd{} -> {json_req, chttpd_external:json_req_obj(Req0, Db)} |
| end, |
| Docs = open_revs(Db, Change, Style), |
| {ok, Passes} = couch_query_servers:filter_docs(Req, Db, DDoc, FName, Docs), |
| filter_revs(Passes, Docs); |
| filter(Db, Change, Filter) -> |
| erlang:error({filter_error, Db, Change, Filter}). |
| |
| |
| get_view_qs({json_req, {Props}}) -> |
| {Query} = couch_util:get_value(<<"query">>, Props, {[]}), |
| binary_to_list(couch_util:get_value(<<"view">>, Query, "")); |
| get_view_qs(Req) -> |
| couch_httpd:qs_value(Req, "view", ""). |
| |
| get_doc_ids({json_req, {Props}}) -> |
| check_docids(couch_util:get_value(<<"doc_ids">>, Props)); |
| get_doc_ids(#httpd{method='POST'}=Req) -> |
| couch_httpd:validate_ctype(Req, "application/json"), |
| {Props} = couch_httpd:json_body_obj(Req), |
| check_docids(couch_util:get_value(<<"doc_ids">>, Props)); |
| get_doc_ids(#httpd{method='GET'}=Req) -> |
| DocIds = ?JSON_DECODE(couch_httpd:qs_value(Req, "doc_ids", "null")), |
| check_docids(DocIds); |
| get_doc_ids(_) -> |
| throw({bad_request, no_doc_ids_provided}). |
| |
| |
| get_selector_and_fields({json_req, {Props}}) -> |
| Selector = check_selector(couch_util:get_value(<<"selector">>, Props)), |
| Fields = check_fields(couch_util:get_value(<<"fields">>, Props, nil)), |
| {Selector, Fields}; |
| get_selector_and_fields(#httpd{method='POST'}=Req) -> |
| couch_httpd:validate_ctype(Req, "application/json"), |
| get_selector_and_fields({json_req, couch_httpd:json_body_obj(Req)}); |
| get_selector_and_fields(_) -> |
| throw({bad_request, "Selector must be specified in POST payload"}). |
| |
| |
| check_docids(DocIds) when is_list(DocIds) -> |
| lists:foreach(fun |
| (DocId) when not is_binary(DocId) -> |
| Msg = "`doc_ids` filter parameter is not a list of doc ids.", |
| throw({bad_request, Msg}); |
| (_) -> ok |
| end, DocIds), |
| DocIds; |
| check_docids(_) -> |
| Msg = "`doc_ids` filter parameter is not a list of doc ids.", |
| throw({bad_request, Msg}). |
| |
| |
| check_selector(Selector={_}) -> |
| try |
| mango_selector:normalize(Selector) |
| catch |
| {mango_error, Mod, Reason0} -> |
| {_StatusCode, _Error, Reason} = mango_error:info(Mod, Reason0), |
| throw({bad_request, Reason}) |
| end; |
| check_selector(_Selector) -> |
| throw({bad_request, "Selector error: expected a JSON object"}). |
| |
| |
| check_fields(nil) -> |
| nil; |
| check_fields(Fields) when is_list(Fields) -> |
| try |
| {ok, Fields1} = mango_fields:new(Fields), |
| Fields1 |
| catch |
| {mango_error, Mod, Reason0} -> |
| {_StatusCode, _Error, Reason} = mango_error:info(Mod, Reason0), |
| throw({bad_request, Reason}) |
| end; |
| check_fields(_Fields) -> |
| throw({bad_request, "Selector error: fields must be JSON array"}). |
| |
| |
| open_ddoc(Db, DDocId) -> |
| case fabric2_db:open_doc(Db, DDocId, [ejson_body, ?ADMIN_CTX]) of |
| {ok, _} = Resp -> Resp; |
| Else -> throw(Else) |
| end. |
| |
| |
| check_member_exists(#doc{body={Props}}, Path) -> |
| couch_util:get_nested_json_value({Props}, Path). |
| |
| |
| apply_style(_Db, Change, main_only) -> |
| #{rev_id := RevId} = Change, |
| [{[{<<"rev">>, couch_doc:rev_to_str(RevId)}]}]; |
| apply_style(Db, Change, all_docs) -> |
| % We have to fetch all revs for this row |
| #{id := DocId} = Change, |
| {ok, Resps} = fabric2_db:open_doc_revs(Db, DocId, all, [deleted]), |
| lists:flatmap(fun(Resp) -> |
| case Resp of |
| {ok, #doc{revs = {Pos, [Rev | _]}}} -> |
| [{[{<<"rev">>, couch_doc:rev_to_str({Pos, Rev})}]}]; |
| _ -> |
| [] |
| end |
| end, Resps); |
| apply_style(Db, Change, Style) -> |
| erlang:error({changes_apply_style, Db, Change, Style}). |
| |
| |
| open_revs(Db, Change, Style) -> |
| #{id := DocId} = Change, |
| Options = [deleted, conflicts], |
| try |
| case Style of |
| main_only -> |
| {ok, Doc} = fabric2_db:open_doc(Db, DocId, Options), |
| [Doc]; |
| all_docs -> |
| {ok, Docs} = fabric2_db:open_doc_revs(Db, DocId, all, Options), |
| [Doc || {ok, Doc} <- Docs] |
| end |
| catch _:_ -> |
| % We didn't log this before, should we now? |
| [] |
| end. |
| |
| |
| filter_revs(Passes, Docs) -> |
| lists:flatmap(fun |
| ({true, #doc{revs={RevPos, [RevId | _]}}}) -> |
| RevStr = couch_doc:rev_to_str({RevPos, RevId}), |
| Change = {[{<<"rev">>, RevStr}]}, |
| [Change]; |
| (_) -> |
| [] |
| end, lists:zip(Passes, Docs)). |
| |
| |
| get_changes_timeout(Args, Callback) -> |
| #changes_args{ |
| heartbeat = Heartbeat, |
| timeout = Timeout, |
| feed = ResponseType |
| } = Args, |
| DefaultTimeout = list_to_integer( |
| config:get("httpd", "changes_timeout", "60000") |
| ), |
| case Heartbeat of |
| undefined -> |
| case Timeout of |
| undefined -> |
| {DefaultTimeout, fun(UserAcc) -> {stop, UserAcc} end}; |
| infinity -> |
| {infinity, fun(UserAcc) -> {stop, UserAcc} end}; |
| _ -> |
| {lists:min([DefaultTimeout, Timeout]), |
| fun(UserAcc) -> {stop, UserAcc} end} |
| end; |
| true -> |
| {DefaultTimeout, |
| fun(UserAcc) -> Callback({timeout, ResponseType}, UserAcc) end}; |
| _ -> |
| {lists:min([DefaultTimeout, Heartbeat]), |
| fun(UserAcc) -> Callback({timeout, ResponseType}, UserAcc) end} |
| end. |
| |
| start_sending_changes(Callback, UserAcc) -> |
| {_, NewUserAcc} = Callback(start, UserAcc), |
| NewUserAcc. |
| |
| build_acc(Args, Callback, UserAcc, Db, StartSeq, Prepend, Timeout, TimeoutFun) -> |
| #changes_args{ |
| include_docs = IncludeDocs, |
| doc_options = DocOpts, |
| conflicts = Conflicts, |
| limit = Limit, |
| feed = ResponseType, |
| filter_fun = Filter |
| } = Args, |
| #changes_acc{ |
| db = Db, |
| seq = StartSeq, |
| prepend = Prepend, |
| filter = Filter, |
| callback = Callback, |
| user_acc = UserAcc, |
| resp_type = ResponseType, |
| limit = Limit, |
| include_docs = IncludeDocs, |
| doc_options = DocOpts, |
| conflicts = Conflicts, |
| timeout = Timeout, |
| timeout_fun = TimeoutFun, |
| aggregation_results=[], |
| aggregation_kvs=[] |
| }. |
| |
| send_changes(Acc, Dir, FirstRound) -> |
| #changes_acc{ |
| db = Db, |
| seq = StartSeq, |
| filter = Filter |
| } = maybe_upgrade_changes_acc(Acc), |
| DbEnumFun = fun changes_enumerator/2, |
| case can_optimize(FirstRound, Filter) of |
| {true, Fun} -> |
| Fun(Db, StartSeq, Dir, DbEnumFun, Acc, Filter); |
| _ -> |
| Opts = [{dir, Dir}], |
| fabric2_db:fold_changes(Db, StartSeq, DbEnumFun, Acc, Opts) |
| end. |
| |
| |
| can_optimize(true, {doc_ids, _Style, DocIds}) -> |
| MaxDocIds = config:get_integer("couchdb", |
| "changes_doc_ids_optimization_threshold", 100), |
| if length(DocIds) =< MaxDocIds -> |
| {true, fun send_changes_doc_ids/6}; |
| true -> |
| false |
| end; |
| can_optimize(true, {design_docs, _Style}) -> |
| {true, fun send_changes_design_docs/6}; |
| can_optimize(_, _) -> |
| false. |
| |
| |
| send_changes_doc_ids(Db, StartSeq, Dir, Fun, Acc0, {doc_ids, _Style, DocIds}) -> |
| Results = fabric2_db:get_full_doc_infos(Db, DocIds), |
| FullInfos = lists:foldl(fun |
| (#full_doc_info{}=FDI, Acc) -> [FDI | Acc]; |
| (not_found, Acc) -> Acc |
| end, [], Results), |
| send_lookup_changes(FullInfos, StartSeq, Dir, Db, Fun, Acc0). |
| |
| |
| send_changes_design_docs(Db, StartSeq, Dir, Fun, Acc0, {design_docs, _Style}) -> |
| FoldFun = fun(FDI, Acc) -> {ok, [FDI | Acc]} end, |
| Opts = [ |
| include_deleted, |
| {start_key, <<"_design/">>}, |
| {end_key_gt, <<"_design0">>} |
| ], |
| {ok, FullInfos} = fabric2_db:fold_docs(Db, FoldFun, [], Opts), |
| send_lookup_changes(FullInfos, StartSeq, Dir, Db, Fun, Acc0). |
| |
| |
| send_lookup_changes(FullDocInfos, StartSeq, Dir, Db, Fun, Acc0) -> |
| FoldFun = case Dir of |
| fwd -> fun lists:foldl/3; |
| rev -> fun lists:foldr/3 |
| end, |
| GreaterFun = case Dir of |
| fwd -> fun(A, B) -> A > B end; |
| rev -> fun(A, B) -> A =< B end |
| end, |
| DocInfos = lists:foldl(fun(FDI, Acc) -> |
| DI = couch_doc:to_doc_info(FDI), |
| case GreaterFun(DI#doc_info.high_seq, StartSeq) of |
| true -> [DI | Acc]; |
| false -> Acc |
| end |
| end, [], FullDocInfos), |
| SortedDocInfos = lists:keysort(#doc_info.high_seq, DocInfos), |
| FinalAcc = try |
| FoldFun(fun(DocInfo, Acc) -> |
| % Kinda gross that we're munging this back to a map |
| % that will then have to re-read and rebuild the FDI |
| % for all_docs style. But c'est la vie. |
| #doc_info{ |
| id = DocId, |
| high_seq = Seq, |
| revs = [#rev_info{rev = Rev, deleted = Deleted} | _] |
| } = DocInfo, |
| Change = #{ |
| id => DocId, |
| sequence => Seq, |
| rev_id => Rev, |
| deleted => Deleted |
| }, |
| case Fun(Change, Acc) of |
| {ok, NewAcc} -> |
| NewAcc; |
| {stop, NewAcc} -> |
| throw({stop, NewAcc}) |
| end |
| end, Acc0, SortedDocInfos) |
| catch |
| {stop, Acc} -> Acc |
| end, |
| case Dir of |
| fwd -> |
| FinalAcc0 = case element(1, FinalAcc) of |
| changes_acc -> % we came here via couch_http or internal call |
| FinalAcc#changes_acc{seq = fabric2_db:get_update_seq(Db)}; |
| fabric_changes_acc -> % we came here via chttpd / fabric / rexi |
| FinalAcc#fabric_changes_acc{seq = couch_db:get_update_seq(Db)} |
| end, |
| {ok, FinalAcc0}; |
| rev -> {ok, FinalAcc} |
| end. |
| |
| |
| keep_sending_changes(Args, Acc0, FirstRound) -> |
| #changes_args{ |
| feed = ResponseType, |
| limit = Limit, |
| db_open_options = DbOptions |
| } = Args, |
| |
| {ok, ChangesAcc} = send_changes(Acc0, fwd, FirstRound), |
| |
| #changes_acc{ |
| db = Db, callback = Callback, |
| timeout = Timeout, timeout_fun = TimeoutFun, seq = EndSeq, |
| prepend = Prepend2, user_acc = UserAcc2, limit = NewLimit |
| } = maybe_upgrade_changes_acc(ChangesAcc), |
| |
| if Limit > NewLimit, ResponseType == "longpoll" -> |
| end_sending_changes(Callback, UserAcc2, EndSeq); |
| true -> |
| {Go, UserAcc3} = notify_waiting_for_updates(Callback, UserAcc2), |
| if Go /= ok -> end_sending_changes(Callback, UserAcc3, EndSeq); true -> |
| case wait_updated(Timeout, TimeoutFun, UserAcc3) of |
| {updated, UserAcc4} -> |
| UserCtx = fabric2_db:get_user_ctx(Db), |
| DbOptions1 = [{user_ctx, UserCtx} | DbOptions], |
| case fabric2_db:open(fabric2_db:name(Db), DbOptions1) of |
| {ok, Db2} -> |
| ?MODULE:keep_sending_changes( |
| Args#changes_args{limit=NewLimit}, |
| ChangesAcc#changes_acc{ |
| db = Db2, |
| user_acc = UserAcc4, |
| seq = EndSeq, |
| prepend = Prepend2, |
| timeout = Timeout, |
| timeout_fun = TimeoutFun}, |
| false); |
| _Else -> |
| end_sending_changes(Callback, UserAcc3, EndSeq) |
| end; |
| {stop, UserAcc4} -> |
| end_sending_changes(Callback, UserAcc4, EndSeq) |
| end |
| end |
| end. |
| |
| notify_waiting_for_updates(Callback, UserAcc) -> |
| Callback(waiting_for_updates, UserAcc). |
| |
| end_sending_changes(Callback, UserAcc, EndSeq) -> |
| Callback({stop, EndSeq, null}, UserAcc). |
| |
| changes_enumerator(Change, Acc) -> |
| #changes_acc{ |
| filter = Filter, |
| callback = Callback, |
| user_acc = UserAcc, |
| limit = Limit, |
| db = Db, |
| timeout = Timeout, |
| timeout_fun = TimeoutFun |
| } = maybe_upgrade_changes_acc(Acc), |
| Results0 = filter(Db, Change, Filter), |
| Results = [Result || Result <- Results0, Result /= null], |
| Seq = maps:get(sequence, Change), |
| Go = if (Limit =< 1) andalso Results =/= [] -> stop; true -> ok end, |
| case Results of |
| [] -> |
| {Done, UserAcc2} = maybe_heartbeat(Timeout, TimeoutFun, UserAcc), |
| case Done of |
| stop -> |
| {stop, Acc#changes_acc{seq = Seq, user_acc = UserAcc2}}; |
| ok -> |
| {Go, Acc#changes_acc{seq = Seq, user_acc = UserAcc2}} |
| end; |
| _ -> |
| ChangesRow = changes_row(Results, Change, Acc), |
| {UserGo, UserAcc2} = Callback({change, ChangesRow}, UserAcc), |
| RealGo = case UserGo of |
| ok -> Go; |
| stop -> stop |
| end, |
| reset_heartbeat(), |
| {RealGo, Acc#changes_acc{ |
| seq = Seq, |
| user_acc = UserAcc2, |
| limit = Limit - 1 |
| }} |
| end. |
| |
| |
| changes_row(Results, Change, Acc) -> |
| #{ |
| id := Id, |
| sequence := Seq, |
| deleted := Del |
| } = Change, |
| {[ |
| {<<"seq">>, Seq}, |
| {<<"id">>, Id}, |
| {<<"changes">>, Results} |
| ] ++ deleted_item(Del) ++ maybe_get_changes_doc(Change, Acc)}. |
| |
| maybe_get_changes_doc(Value, #changes_acc{include_docs=true}=Acc) -> |
| #changes_acc{ |
| db = Db, |
| doc_options = DocOpts0, |
| conflicts = Conflicts, |
| filter = Filter |
| } = Acc, |
| OpenOpts = case Conflicts of |
| true -> [deleted, conflicts]; |
| false -> [deleted] |
| end, |
| DocOpts1 = case Conflicts of |
| true -> [conflicts | DocOpts0]; |
| false -> DocOpts0 |
| end, |
| load_doc(Db, Value, OpenOpts, DocOpts1, Filter); |
| |
| maybe_get_changes_doc(_Value, _Acc) -> |
| []. |
| |
| |
| load_doc(Db, Value, Opts, DocOpts, Filter) -> |
| case load_doc(Db, Value, Opts) of |
| null -> |
| [{doc, null}]; |
| Doc -> |
| [{doc, doc_to_json(Doc, DocOpts, Filter)}] |
| end. |
| |
| |
| load_doc(Db, Change, Opts) -> |
| #{ |
| id := Id, |
| rev_id := RevId |
| } = Change, |
| case fabric2_db:open_doc_revs(Db, Id, [RevId], Opts) of |
| {ok, [{ok, Doc}]} -> |
| Doc; |
| _ -> |
| null |
| end. |
| |
| |
| doc_to_json(Doc, DocOpts, {selector, _Style, {_Selector, Fields}}) |
| when Fields =/= nil -> |
| mango_fields:extract(couch_doc:to_json_obj(Doc, DocOpts), Fields); |
| doc_to_json(Doc, DocOpts, _Filter) -> |
| couch_doc:to_json_obj(Doc, DocOpts). |
| |
| |
| deleted_item(true) -> [{<<"deleted">>, true}]; |
| deleted_item(_) -> []. |
| |
| % waits for a updated msg, if there are multiple msgs, collects them. |
| wait_updated(Timeout, TimeoutFun, UserAcc) -> |
| receive |
| updated -> |
| get_rest_updated(UserAcc); |
| deleted -> |
| {stop, UserAcc} |
| after Timeout -> |
| {Go, UserAcc2} = TimeoutFun(UserAcc), |
| case Go of |
| ok -> |
| ?MODULE:wait_updated(Timeout, TimeoutFun, UserAcc2); |
| stop -> |
| {stop, UserAcc2} |
| end |
| end. |
| |
| get_rest_updated(UserAcc) -> |
| receive |
| updated -> |
| get_rest_updated(UserAcc) |
| after 0 -> |
| {updated, UserAcc} |
| end. |
| |
| reset_heartbeat() -> |
| case get(last_changes_heartbeat) of |
| undefined -> |
| ok; |
| _ -> |
| put(last_changes_heartbeat, os:timestamp()) |
| end. |
| |
| maybe_heartbeat(Timeout, TimeoutFun, Acc) -> |
| Before = get(last_changes_heartbeat), |
| case Before of |
| undefined -> |
| {ok, Acc}; |
| _ -> |
| Now = os:timestamp(), |
| case timer:now_diff(Now, Before) div 1000 >= Timeout of |
| true -> |
| {StopOrGo, Acc2} = TimeoutFun(Acc), |
| put(last_changes_heartbeat, Now), |
| {StopOrGo, Acc2}; |
| false -> |
| {ok, Acc} |
| end |
| end. |
| |
| |
| maybe_upgrade_changes_acc(#changes_acc{} = Acc) -> |
| Acc; |
| maybe_upgrade_changes_acc(Acc) when tuple_size(Acc) == 19 -> |
| #changes_acc{ |
| db = element(2, Acc), |
| seq = element(6, Acc), |
| prepend = element(7, Acc), |
| filter = element(8, Acc), |
| callback = element(9, Acc), |
| user_acc = element(10, Acc), |
| resp_type = element(11, Acc), |
| limit = element(12, Acc), |
| include_docs = element(13, Acc), |
| doc_options = element(14, Acc), |
| conflicts = element(15, Acc), |
| timeout = element(16, Acc), |
| timeout_fun = element(17, Acc), |
| aggregation_kvs = element(18, Acc), |
| aggregation_results = element(19, Acc) |
| }. |