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-module(fabric_rpc).
-export([get_db_info/1, get_doc_count/1, get_update_seq/1]).
-export([open_doc/3, open_revs/4, get_missing_revs/2, update_docs/3]).
-export([all_docs/2, map_view/4]).
-include("fabric.hrl").
-record (view_acc, {
db,
limit,
include_docs,
offset = nil,
total_rows,
reduce_fun = fun couch_db:enum_docs_reduce_to_count/1,
stop_fun,
group_level = 0
}).
%% rpc endpoints
%% call to with_db will supply your M:F with a #db{} and then remaining args
all_docs(DbName, #view_query_args{keys=nil} = QueryArgs) ->
{ok, Db} = couch_db:open(DbName, []),
#view_query_args{
start_key = StartKey,
start_docid = StartDocId,
limit = Limit,
skip = Skip,
include_docs = IncludeDocs,
direction = Dir
} = QueryArgs,
StartId = if is_binary(StartKey) -> StartKey; true -> StartDocId end,
{ok, Total} = couch_db:get_doc_count(Db),
Acc0 = #view_acc{
db = Db,
include_docs = IncludeDocs,
limit = Limit+Skip,
total_rows = Total,
stop_fun = all_docs_stop_fun(QueryArgs)
},
{ok, Acc} = couch_db:enum_docs(Db, StartId, Dir, fun view_fold/3, Acc0),
final_response(Total, Acc#view_acc.offset).
map_view(DbName, DDoc, ViewName, QueryArgs) ->
{ok, Db} = couch_db:open(DbName, []),
#view_query_args{
start_key = StartKey,
start_docid = StartDocId,
limit = Limit,
skip = Skip,
keys = Keys,
include_docs = IncludeDocs,
direction = Dir,
stale = Stale,
view_type = ViewType
} = QueryArgs,
Start = {StartKey, StartDocId},
MinSeq = if Stale == ok -> 0; true -> couch_db:get_update_seq(Db) end,
Group0 = couch_view_group:design_doc_to_view_group(Db, DDoc),
{ok, Pid} = gen_server:call(couch_view, {get_group_server, DbName, Group0}),
{ok, Group} = couch_view_group:request_group(Pid, MinSeq),
View = extract_view(Pid, ViewName, Group#group.views, ViewType),
{ok, Total} = couch_view:get_row_count(View),
Acc0 = #view_acc{
db = Db,
include_docs = IncludeDocs,
limit = Limit+Skip,
total_rows = Total,
reduce_fun = fun couch_view:reduce_to_count/1,
stop_fun = default_stop_fun(QueryArgs)
},
case Keys of
nil ->
{ok, Acc} = couch_view:fold(View, Start, Dir, fun view_fold/3, Acc0);
_ ->
Acc = lists:foldl(fun(Key, AccIn) ->
KeyStart = {Key, StartDocId},
KeyStop = default_stop_fun(QueryArgs#view_query_args{start_key=Key,
end_key=Key}),
{_Go, Out} = couch_view:fold(View, KeyStart, Dir, fun view_fold/3,
AccIn#view_acc{stop_fun = KeyStop}),
Out
end, Acc0, Keys)
end,
final_response(Total, Acc#view_acc.offset).
get_db_info(DbName) ->
with_db(DbName, [], {couch_db, get_db_info, []}).
get_doc_count(DbName) ->
with_db(DbName, [], {couch_db, get_doc_count, []}).
get_update_seq(DbName) ->
rexi:reply(case couch_db:open(DbName, []) of
{ok, #db{update_seq = Seq}} ->
{ok, Seq};
Error ->
Error
end).
open_doc(DbName, DocId, Options) ->
with_db(DbName, Options, {couch_db, open_doc_int, [DocId, Options]}).
open_revs(DbName, Id, Revs, Options) ->
with_db(DbName, Options, {couch_db, open_doc_revs, [Id, Revs, Options]}).
get_missing_revs(DbName, IdRevsList) ->
% reimplement here so we get [] for Ids with no missing revs in response
rexi:reply(case couch_db:open(DbName, []) of
{ok, Db} ->
Ids = [Id1 || {Id1, _Revs} <- IdRevsList],
{ok, lists:zipwith(fun({Id, Revs}, FullDocInfoResult) ->
case FullDocInfoResult of
{ok, #full_doc_info{rev_tree=RevisionTree}} ->
{Id, couch_key_tree:find_missing(RevisionTree, Revs)};
not_found ->
{Id, Revs}
end
end, IdRevsList, couch_btree:lookup(Db#db.id_tree, Ids))};
Error ->
Error
end).
update_docs(DbName, Docs, Options) ->
with_db(DbName, Options, {couch_db, update_docs, [Docs, Options]}).
%%
%% internal
%%
with_db(DbName, Options, {M,F,A}) ->
case couch_db:open(DbName, Options) of
{ok, Db} ->
rexi:reply(apply(M, F, [Db | A]));
Error ->
rexi:reply(Error)
end.
view_fold(#full_doc_info{} = FullDocInfo, OffsetReds, Acc) ->
% matches for _all_docs and translates #full_doc_info{} -> KV pair
case couch_doc:to_doc_info(FullDocInfo) of
#doc_info{revs=[#rev_info{deleted=false, rev=Rev}|_]} ->
Id = FullDocInfo#full_doc_info.id,
Value = {[{rev,couch_doc:rev_to_str(Rev)}]},
view_fold({{Id,Id}, Value}, OffsetReds, Acc);
#doc_info{revs=[#rev_info{deleted=true}|_]} ->
{ok, Acc}
end;
view_fold(KV, OffsetReds, #view_acc{offset=nil, total_rows=Total} = Acc) ->
% calculates the offset for this shard
#view_acc{reduce_fun=Reduce} = Acc,
Offset = Reduce(OffsetReds),
case rexi:sync_reply({total_and_offset, Total, Offset}) of
ok ->
view_fold(KV, OffsetReds, Acc#view_acc{offset=Offset});
stop ->
exit(normal)
end;
view_fold(_KV, _Offset, #view_acc{limit=0} = Acc) ->
% we scanned through limit+skip local rows
{stop, Acc};
view_fold({{Key,Id}, Value}, _Offset, Acc) ->
% the normal case
#view_acc{
db = Db,
limit = Limit,
include_docs = IncludeDocs,
stop_fun = PassedEnd
} = Acc,
case PassedEnd(Key, Id) of
true ->
{stop, Acc};
false ->
Doc = if not IncludeDocs -> undefined; true ->
case couch_db:open_doc(Db, Id, []) of
{not_found, deleted} ->
null;
{not_found, missing} ->
undefined;
{ok, Doc0} ->
couch_doc:to_json_obj(Doc0, [])
end
end,
rexi:sync_reply(#view_row{key=Key, id=Id, value=Value, doc=Doc}),
{ok, Acc#view_acc{limit=Limit-1}}
end.
all_docs_stop_fun(#view_query_args{direction=fwd, end_key=EndKey}) ->
fun(ViewKey, _) ->
couch_db_updater:less_docid(EndKey, ViewKey)
end;
all_docs_stop_fun(#view_query_args{direction=rev, end_key=EndKey}) ->
fun(ViewKey, _) ->
couch_db_updater:less_docid(ViewKey, EndKey)
end.
final_response(Total, nil) ->
case rexi:sync_reply({total_and_offset, Total, Total}) of ok ->
rexi:reply(complete);
stop -> ok end;
final_response(_Total, _Offset) ->
rexi:reply(complete).
default_stop_fun(#view_query_args{direction=fwd, inclusive_end=true} = Args) ->
#view_query_args{end_key=EndKey, end_docid=EndDocId} = Args,
fun(ViewKey, ViewId) ->
couch_view:less_json([EndKey, EndDocId], [ViewKey, ViewId])
end;
default_stop_fun(#view_query_args{direction=fwd} = Args) ->
#view_query_args{end_key=EndKey, end_docid=EndDocId} = Args,
fun
(ViewKey, _ViewId) when ViewKey == EndKey ->
true;
(ViewKey, ViewId) ->
couch_view:less_json([EndKey, EndDocId], [ViewKey, ViewId])
end;
default_stop_fun(#view_query_args{direction=rev, inclusive_end=true} = Args) ->
#view_query_args{end_key=EndKey, end_docid=EndDocId} = Args,
fun(ViewKey, ViewId) ->
couch_view:less_json([ViewKey, ViewId], [EndKey, EndDocId])
end;
default_stop_fun(#view_query_args{direction=rev} = Args) ->
#view_query_args{end_key=EndKey, end_docid=EndDocId} = Args,
fun
(ViewKey, _ViewId) when ViewKey == EndKey ->
true;
(ViewKey, ViewId) ->
couch_view:less_json([ViewKey, ViewId], [EndKey, EndDocId])
end.
extract_view(Pid, ViewName, [], _ViewType) ->
?LOG_ERROR("missing_named_view ~p", [ViewName]),
exit(Pid, kill),
exit(missing_named_view);
extract_view(Pid, ViewName, [View|Rest], ViewType) ->
case lists:member(ViewName, view_names(View, ViewType)) of
true ->
if ViewType == reduce ->
{index_of(ViewName, view_names(View, reduce)), View};
true ->
View
end;
false ->
extract_view(Pid, ViewName, Rest, ViewType)
end.
view_names(View, Type) when Type == red_map; Type == reduce ->
[Name || {Name, _} <- View#view.reduce_funs];
view_names(View, map) ->
View#view.map_names.
index_of(X, List) ->
index_of(X, List, 1).
index_of(_X, [], _I) ->
not_found;
index_of(X, [X|_Rest], I) ->
I;
index_of(X, [_|Rest], I) ->
index_of(X, Rest, I+1).
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