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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_eval).
-behavior(couch_eval).
-export([
acquire_map_context/1,
release_map_context/1,
map_docs/2
]).
-export([
index_doc/2
]).
-include_lib("couch/include/couch_db.hrl").
-include("mango_idx.hrl").
acquire_map_context(Opts) ->
#{
db_name := DbName,
ddoc_id := DDocId,
map_funs := MapFuns
} = Opts,
Indexes = lists:map(fun (Def) ->
#idx{
type = <<"json">>,
dbname = DbName,
ddoc = DDocId,
def = Def
}
end, MapFuns),
{ok, Indexes}.
release_map_context(_) ->
ok.
map_docs(Indexes, Docs) ->
{ok, lists:map(fun(Doc) ->
Json = couch_doc:to_json_obj(Doc, []),
Results = index_doc(Indexes, Json),
{Doc#doc.id, Results}
end, Docs)}.
index_doc(Indexes, Doc) ->
lists:map(fun(Idx) ->
{IdxDef} = mango_idx:def(Idx),
Results = get_index_entries(IdxDef, Doc),
case lists:member(not_found, Results) of
true ->
[];
false ->
[{Results, null}]
end
end, Indexes).
get_index_entries(IdxDef, Doc) ->
{Fields} = couch_util:get_value(<<"fields">>, IdxDef),
Selector = get_index_partial_filter_selector(IdxDef),
case should_index(Selector, Doc) of
false ->
[not_found];
true ->
get_index_values(Fields, Doc)
end.
get_index_values(Fields, Doc) ->
lists:map(fun({Field, _Dir}) ->
case mango_doc:get_field(Doc, Field) of
not_found -> not_found;
bad_path -> not_found;
Value -> Value
end
end, Fields).
get_index_partial_filter_selector(IdxDef) ->
case couch_util:get_value(<<"partial_filter_selector">>, IdxDef, {[]}) of
{[]} ->
% this is to support legacy text indexes that had the
% partial_filter_selector set as selector
couch_util:get_value(<<"selector">>, IdxDef, {[]});
Else ->
Else
end.
should_index(Selector, Doc) ->
NormSelector = mango_selector:normalize(Selector),
Matches = mango_selector:match(NormSelector, Doc),
IsDesign = case mango_doc:get_field(Doc, <<"_id">>) of
<<"_design/", _/binary>> -> true;
_ -> false
end,
Matches and not IsDesign.
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