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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(mango_json_bookmark).
-export([
update_args/2,
create/1
]).
-include_lib("couch_mrview/include/couch_mrview.hrl").
-include("mango_cursor.hrl").
-include("mango.hrl").
update_args(EncodedBookmark, #mrargs{skip = Skip} = Args) ->
Bookmark = unpack(EncodedBookmark),
case is_list(Bookmark) of
true ->
{startkey, Startkey} = lists:keyfind(startkey, 1, Bookmark),
{startkey_docid, StartkeyDocId} = lists:keyfind(startkey_docid, 1, Bookmark),
Args#mrargs{
start_key = Startkey,
start_key_docid = StartkeyDocId,
skip = 1 + Skip
};
false ->
Args
end.
create(#cursor{bookmark_docid = BookmarkDocId, bookmark_key = BookmarkKey}) when BookmarkKey =/= undefined ->
QueryArgs = [
{startkey_docid, BookmarkDocId},
{startkey, BookmarkKey}
],
Bin = term_to_binary(QueryArgs, [compressed, {minor_version,1}]),
couch_util:encodeBase64Url(Bin);
create(#cursor{bookmark = Bookmark}) ->
Bookmark.
unpack(nil) ->
nil;
unpack(Packed) ->
try
Bookmark = binary_to_term(couch_util:decodeBase64Url(Packed), [safe]),
verify(Bookmark)
catch _:_ ->
?MANGO_ERROR({invalid_bookmark, Packed})
end.
verify(Bookmark) when is_list(Bookmark) ->
case lists:keymember(startkey, 1, Bookmark) andalso lists:keymember(startkey_docid, 1, Bookmark) of
true -> Bookmark;
_ -> throw(invalid_bookmark)
end;
verify(_Bookmark) ->
throw(invalid_bookmark).
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