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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(couch_doc).
-export([get_view_functions/1, is_special_doc/1,to_doc_info/1]).
-export([bin_foldl/3,bin_size/1,bin_to_binary/1]).
-export([from_json_obj/1,to_json_obj/2,has_stubs/1, merge_stubs/2]).
-include("couch_db.hrl").
to_json_obj(#doc{id=Id,deleted=Del,body=Body,revs=Revs,meta=Meta}=Doc,Options)->
{obj, [{"_id", Id}] ++
case Revs of
[] -> [];
_ -> [{"_rev", lists:nth(1, Revs)}]
end ++
case Del of
false ->
{obj, BodyProps} = Body,
BodyProps;
true ->
[{"_deleted", true}]
end ++
case lists:member(revs, Options) of
false -> [];
true ->
[{"_revs", list_to_tuple(Revs)}]
end ++
lists:map(
fun({revs_info, RevsInfo}) ->
JsonRevsInfo =
[{obj, [{rev, Rev}, {status, atom_to_list(Status)}]} ||
{Rev, Status} <- RevsInfo],
{"_revs_info", list_to_tuple(JsonRevsInfo)};
({conflicts, Conflicts}) ->
{"_conflicts", list_to_tuple(Conflicts)};
({deleted_conflicts, Conflicts}) ->
{"_deleted_conflicts", list_to_tuple(Conflicts)}
end, Meta) ++
case lists:member(attachments, Options) of
true -> % return the full rev list and the binaries as strings.
BinProps = lists:map(
fun({Name, {Type, BinValue}}) ->
{Name, {obj, [{"content-type", Type},
{"data", couch_util:encodeBase64(bin_to_binary(BinValue))}]}}
end,
Doc#doc.attachments),
case BinProps of
[] -> [];
_ -> [{"_attachments", {obj, BinProps}}]
end;
false ->
BinProps = lists:map(
fun({Name, {Type, BinValue}}) ->
{Name, {obj, [{"stub", true}, {"content-type", Type},
{"length", bin_size(BinValue)}]}}
end,
Doc#doc.attachments),
case BinProps of
[] -> [];
_ -> [{"_attachments", {obj, BinProps}}]
end
end
}.
from_json_obj({obj, Props}) ->
{obj,JsonBins} = proplists:get_value("_attachments", Props, {obj, []}),
Bins = lists:flatmap(fun({Name, {obj, BinProps}}) ->
case proplists:get_value("stub", BinProps) of
true ->
[{Name, stub}];
_ ->
Value = proplists:get_value("data", BinProps),
Type = proplists:get_value("content-type", BinProps,
?DEFAULT_ATTACHMENT_CONTENT_TYPE),
[{Name, {Type, couch_util:decodeBase64(Value)}}]
end
end, JsonBins),
AllowedSpecialMembers = ["id", "revs", "rev", "attachments", "revs_info",
"conflicts", "deleted_conflicts", "deleted"],
[case lists:member(Name, AllowedSpecialMembers) of
true ->
ok;
false ->
throw({doc_validation, io_lib:format("Bad special document member: _~s", [Name])})
end
|| {[$_|Name], _Value} <- Props],
Revs =
case tuple_to_list(proplists:get_value("_revs", Props, {})) of
[] ->
case proplists:get_value("_rev", Props) of
undefined -> [];
Rev -> [Rev]
end;
Revs0 ->
Revs0
end,
#doc{
id = proplists:get_value("_id", Props, ""),
revs = Revs,
deleted = proplists:get_value("_deleted", Props, false),
body = {obj, [{Key, Value} || {[FirstChar|_]=Key, Value} <- Props, FirstChar /= $_]},
attachments = Bins
}.
to_doc_info(#full_doc_info{id=Id,update_seq=Seq,rev_tree=Tree}) ->
LeafRevs = couch_key_tree:get_all_leafs(Tree),
SortedLeafRevs =
lists:sort(fun({RevIdA, {IsDeletedA, _}, PathA}, {RevIdB, {IsDeletedB, _}, PathB}) ->
% sort descending by {not deleted, then Depth, then RevisionId}
A = {not IsDeletedA, length(PathA), RevIdA},
B = {not IsDeletedB, length(PathB), RevIdB},
A > B
end,
LeafRevs),
[{RevId, {IsDeleted, SummaryPointer}, _Path} | Rest] = SortedLeafRevs,
{ConflictRevTuples, DeletedConflictRevTuples} =
lists:splitwith(fun({_ConflictRevId, {IsDeleted1, _SummaryPointer}, _}) ->
not IsDeleted1
end, Rest),
ConflictRevs = [RevId1 || {RevId1, _, _} <- ConflictRevTuples],
DeletedConflictRevs = [RevId2 || {RevId2, _, _} <- DeletedConflictRevTuples],
#doc_info{
id=Id,
update_seq=Seq,
rev = RevId,
summary_pointer = SummaryPointer,
conflict_revs = ConflictRevs,
deleted_conflict_revs = DeletedConflictRevs,
deleted = IsDeleted
}.
is_special_doc(?DESIGN_DOC_PREFIX ++ _ ) ->
true;
is_special_doc(#doc{id=Id}) ->
is_special_doc(Id);
is_special_doc(_) ->
false.
bin_foldl(Bin, Fun, Acc) when is_binary(Bin) ->
case Fun(Bin, Acc) of
{ok, Acc2} -> {ok, Acc2};
{done, Acc2} -> {ok, Acc2}
end;
bin_foldl({Fd, Sp, Len}, Fun, Acc) ->
{ok, Acc2, _Sp2} = couch_stream:foldl(Fd, Sp, Len, Fun, Acc),
{ok, Acc2}.
bin_size(Bin) when is_binary(Bin) ->
size(Bin);
bin_size({_Fd, _Sp, Len}) ->
Len.
bin_to_binary(Bin) when is_binary(Bin) ->
Bin;
bin_to_binary({Fd, Sp, Len}) ->
{ok, Bin, _Sp2} = couch_stream:read(Fd, Sp, Len),
Bin.
get_view_functions(#doc{body={obj, Fields}}) ->
Lang = proplists:get_value("language", Fields, "text/javascript"),
{obj, Views} = proplists:get_value("views", Fields, {obj, []}),
{Lang, [{ViewName, Value} || {ViewName, Value} <- Views, is_list(Value)]};
get_view_functions(_Doc) ->
none.
has_stubs(#doc{attachments=Bins}) ->
has_stubs(Bins);
has_stubs([]) ->
false;
has_stubs([{_Name, stub}|_]) ->
true;
has_stubs([_Bin|Rest]) ->
has_stubs(Rest).
merge_stubs(#doc{attachments=MemBins}=StubsDoc, #doc{attachments=DiskBins}) ->
BinDict = dict:from_list(DiskBins),
MergedBins = lists:map(
fun({Name, stub}) ->
{Name, dict:fetch(Name, BinDict)};
({Name, Value}) ->
{Name, Value}
end, MemBins),
StubsDoc#doc{attachments= MergedBins}.
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