diff options
author | Adam Kocoloski <adam@cloudant.com> | 2010-08-11 15:22:33 -0400 |
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committer | Adam Kocoloski <adam@cloudant.com> | 2010-08-11 17:39:37 -0400 |
commit | 81bdbed444df2cbcf3cdb32f7d4a74019de06454 (patch) | |
tree | eade7d0d9bb4cac01b55fd8642adfe0f7da35161 /src/couchdb/couch_changes.erl | |
parent | cc1910f73fbd20c5ffc94bd61e7701d7f5e4c92a (diff) |
reorganize couch .erl and driver code into rebar layout
Diffstat (limited to 'src/couchdb/couch_changes.erl')
-rw-r--r-- | src/couchdb/couch_changes.erl | 270 |
1 files changed, 0 insertions, 270 deletions
diff --git a/src/couchdb/couch_changes.erl b/src/couchdb/couch_changes.erl deleted file mode 100644 index 3a5bc4f8..00000000 --- a/src/couchdb/couch_changes.erl +++ /dev/null @@ -1,270 +0,0 @@ -% 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_changes). --include("couch_db.hrl"). - --export([handle_changes/3]). - -%% @type Req -> #httpd{} | {json_req, JsonObj()} -handle_changes(#changes_args{style=Style}=Args1, Req, Db) -> - Args = Args1#changes_args{filter= - make_filter_fun(Args1#changes_args.filter, Style, Req, Db)}, - StartSeq = case Args#changes_args.dir of - rev -> - couch_db:get_update_seq(Db); - fwd -> - Args#changes_args.since - end, - if Args#changes_args.feed == "continuous" orelse - Args#changes_args.feed == "longpoll" -> - fun(Callback) -> - Self = self(), - {ok, Notify} = couch_db_update_notifier:start_link( - fun({_, DbName}) when DbName == Db#db.name -> - Self ! db_updated; - (_) -> - ok - end - ), - start_sending_changes(Callback, Args#changes_args.feed), - {Timeout, TimeoutFun} = get_changes_timeout(Args, Callback), - try - keep_sending_changes( - Args, - Callback, - Db, - StartSeq, - <<"">>, - Timeout, - TimeoutFun - ) - after - couch_db_update_notifier:stop(Notify), - get_rest_db_updated() % clean out any remaining update messages - end - end; - true -> - fun(Callback) -> - start_sending_changes(Callback, Args#changes_args.feed), - {ok, {_, LastSeq, _Prepend, _, _, _, _, _}} = - send_changes( - Args#changes_args{feed="normal"}, - Callback, - Db, - StartSeq, - <<"">> - ), - end_sending_changes(Callback, LastSeq, Args#changes_args.feed) - end - end. - -%% @type Req -> #httpd{} | {json_req, JsonObj()} -make_filter_fun(FilterName, Style, Req, Db) -> - case [list_to_binary(couch_httpd:unquote(Part)) - || Part <- string:tokens(FilterName, "/")] of - [] -> - fun(#doc_info{revs=[#rev_info{rev=Rev}|_]=Revs}) -> - case Style of - main_only -> - [{[{<<"rev">>, couch_doc:rev_to_str(Rev)}]}]; - all_docs -> - [{[{<<"rev">>, couch_doc:rev_to_str(R)}]} - || #rev_info{rev=R} <- Revs] - end - end; - [DName, FName] -> - DesignId = <<"_design/", DName/binary>>, - DDoc = couch_httpd_db:couch_doc_open(Db, DesignId, nil, []), - % validate that the ddoc has the filter fun - #doc{body={Props}} = DDoc, - couch_util:get_nested_json_value({Props}, [<<"filters">>, FName]), - fun(DocInfo) -> - DocInfos = - case Style of - main_only -> - [DocInfo]; - all_docs -> - [DocInfo#doc_info{revs=[Rev]}|| Rev <- DocInfo#doc_info.revs] - end, - Docs = [Doc || {ok, Doc} <- [ - couch_db:open_doc(Db, DocInfo2, [deleted, conflicts]) - || DocInfo2 <- DocInfos]], - {ok, Passes} = couch_query_servers:filter_docs( - Req, Db, DDoc, FName, Docs - ), - [{[{<<"rev">>, couch_doc:rev_to_str({RevPos,RevId})}]} - || {Pass, #doc{revs={RevPos,[RevId|_]}}} - <- lists:zip(Passes, Docs), Pass == true] - end; - _Else -> - throw({bad_request, - "filter parameter must be of the form `designname/filtername`"}) - end. - -get_changes_timeout(Args, Callback) -> - #changes_args{ - heartbeat = Heartbeat, - timeout = Timeout, - feed = ResponseType - } = Args, - DefaultTimeout = list_to_integer( - couch_config:get("httpd", "changes_timeout", "60000") - ), - case Heartbeat of - undefined -> - case Timeout of - undefined -> - {DefaultTimeout, fun() -> stop end}; - infinity -> - {infinity, fun() -> stop end}; - _ -> - {lists:min([DefaultTimeout, Timeout]), fun() -> stop end} - end; - true -> - {DefaultTimeout, fun() -> Callback(timeout, ResponseType), ok end}; - _ -> - {lists:min([DefaultTimeout, Heartbeat]), - fun() -> Callback(timeout, ResponseType), ok end} - end. - -start_sending_changes(_Callback, "continuous") -> - ok; -start_sending_changes(Callback, ResponseType) -> - Callback(start, ResponseType). - -send_changes(Args, Callback, Db, StartSeq, Prepend) -> - #changes_args{ - style = Style, - include_docs = IncludeDocs, - limit = Limit, - feed = ResponseType, - dir = Dir, - filter = FilterFun - } = Args, - couch_db:changes_since( - Db, - Style, - StartSeq, - fun changes_enumerator/2, - [{dir, Dir}], - {Db, StartSeq, Prepend, FilterFun, Callback, ResponseType, Limit, - IncludeDocs} - ). - -keep_sending_changes(Args, Callback, Db, StartSeq, Prepend, Timeout, - TimeoutFun) -> - #changes_args{ - feed = ResponseType, - limit = Limit - } = Args, - % ?LOG_INFO("send_changes start ~p",[StartSeq]), - {ok, {_, EndSeq, Prepend2, _, _, _, NewLimit, _}} = send_changes( - Args#changes_args{dir=fwd}, Callback, Db, StartSeq, Prepend - ), - % ?LOG_INFO("send_changes last ~p",[EndSeq]), - couch_db:close(Db), - if Limit > NewLimit, ResponseType == "longpoll" -> - end_sending_changes(Callback, EndSeq, ResponseType); - true -> - case wait_db_updated(Timeout, TimeoutFun) of - updated -> - % ?LOG_INFO("wait_db_updated updated ~p",[{Db#db.name, EndSeq}]), - case couch_db:open(Db#db.name, [{user_ctx, Db#db.user_ctx}]) of - {ok, Db2} -> - keep_sending_changes( - Args#changes_args{limit=NewLimit}, - Callback, - Db2, - EndSeq, - Prepend2, - Timeout, - TimeoutFun - ); - _Else -> - end_sending_changes(Callback, EndSeq, ResponseType) - end; - stop -> - % ?LOG_INFO("wait_db_updated stop ~p",[{Db#db.name, EndSeq}]), - end_sending_changes(Callback, EndSeq, ResponseType) - end - end. - -end_sending_changes(Callback, EndSeq, ResponseType) -> - Callback({stop, EndSeq}, ResponseType). - -changes_enumerator(DocInfo, {Db, _, _, FilterFun, Callback, "continuous", - Limit, IncludeDocs}) -> - - #doc_info{id=Id, high_seq=Seq, - revs=[#rev_info{deleted=Del,rev=Rev}|_]} = DocInfo, - Results0 = FilterFun(DocInfo), - Results = [Result || Result <- Results0, Result /= null], - Go = if Limit =< 1 -> stop; true -> ok end, - case Results of - [] -> - {Go, {Db, Seq, nil, FilterFun, Callback, "continuous", Limit, - IncludeDocs} - }; - _ -> - ChangesRow = changes_row(Db, Seq, Id, Del, Results, Rev, IncludeDocs), - Callback({change, ChangesRow, <<"">>}, "continuous"), - {Go, {Db, Seq, nil, FilterFun, Callback, "continuous", Limit - 1, - IncludeDocs} - } - end; -changes_enumerator(DocInfo, {Db, _, Prepend, FilterFun, Callback, ResponseType, - Limit, IncludeDocs}) -> - - #doc_info{id=Id, high_seq=Seq, revs=[#rev_info{deleted=Del,rev=Rev}|_]} - = DocInfo, - Results0 = FilterFun(DocInfo), - Results = [Result || Result <- Results0, Result /= null], - Go = if Limit =< 1 -> stop; true -> ok end, - case Results of - [] -> - {Go, {Db, Seq, Prepend, FilterFun, Callback, ResponseType, Limit, - IncludeDocs} - }; - _ -> - ChangesRow = changes_row(Db, Seq, Id, Del, Results, Rev, IncludeDocs), - Callback({change, ChangesRow, Prepend}, ResponseType), - {Go, {Db, Seq, <<",\n">>, FilterFun, Callback, ResponseType, Limit - 1, - IncludeDocs} - } - end. - - -changes_row(Db, Seq, Id, Del, Results, Rev, true) -> - {[{<<"seq">>, Seq}, {<<"id">>, Id}, {<<"changes">>, Results}] ++ - deleted_item(Del) ++ couch_httpd_view:doc_member(Db, {Id, Rev})}; -changes_row(_, Seq, Id, Del, Results, _, false) -> - {[{<<"seq">>, Seq}, {<<"id">>, Id}, {<<"changes">>, Results}] ++ - deleted_item(Del)}. - -deleted_item(true) -> [{deleted, true}]; -deleted_item(_) -> []. - -% waits for a db_updated msg, if there are multiple msgs, collects them. -wait_db_updated(Timeout, TimeoutFun) -> - receive db_updated -> get_rest_db_updated() - after Timeout -> - case TimeoutFun() of - ok -> wait_db_updated(Timeout, TimeoutFun); - stop -> stop - end - end. - -get_rest_db_updated() -> - receive db_updated -> get_rest_db_updated() - after 0 -> updated - end. |