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| author | John Christopher Anderson <jchris@apache.org> | 2010-09-07 06:28:58 +0000 |
|---|---|---|
| committer | John Christopher Anderson <jchris@apache.org> | 2010-09-07 06:28:58 +0000 |
| commit | 3ff18b6b7ca953224e5f03061acefb1ddb69b165 (patch) | |
| tree | e362a22139cd4d7000a97e0b8d8227ec2c5694d8 /src/couchdb | |
| parent | 1c1c7d8359053b8b4b473903b7fadd354064c032 (diff) | |
warn when a view query will be empty due to backwards start and end keys
git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@993226 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'src/couchdb')
| -rw-r--r-- | src/couchdb/couch_httpd_view.erl | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/src/couchdb/couch_httpd_view.erl b/src/couchdb/couch_httpd_view.erl index 16b2791f..96bb45ff 100644 --- a/src/couchdb/couch_httpd_view.erl +++ b/src/couchdb/couch_httpd_view.erl @@ -246,7 +246,7 @@ parse_view_params(Req, Keys, ViewType) -> QueryArgs = lists:foldl(fun({K, V}, Args2) -> validate_view_query(K, V, Args2) end, Args, lists:reverse(QueryParams)), % Reverse to match QS order. - + warn_on_empty_key_range(QueryArgs), GroupLevel = QueryArgs#view_query_args.group_level, case {ViewType, GroupLevel, IsMultiGet} of {reduce, exact, true} -> @@ -313,6 +313,25 @@ parse_view_param("callback", _) -> parse_view_param(Key, Value) -> [{extra, {Key, Value}}]. +warn_on_empty_key_range(#view_query_args{start_key=undefined}) -> + ok; +warn_on_empty_key_range(#view_query_args{end_key=undefined}) -> + ok; +warn_on_empty_key_range(#view_query_args{start_key=A, end_key=A}) -> + ok; +warn_on_empty_key_range(#view_query_args{ + start_key=StartKey, end_key=EndKey, direction=Dir}) -> + ?LOG_ERROR("view_query_args ~p", [{StartKey, EndKey, Dir}]), + case {Dir, couch_view:less_json(StartKey, EndKey)} of + {fwd, false} -> + throw({query_parse_error, + <<"No rows can match your key range, reverse your startkey and endkey or set descending=true">>}); + {rev, true} -> + throw({query_parse_error, + <<"No rows can match your key range, reverse your startkey and endkey or set descending=false">>}); + _ -> ok + end. + validate_view_query(start_key, Value, Args) -> case Args#view_query_args.multi_get of true -> |