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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_httpd_view).
-include("couch_db.hrl").
-export([handle_view_req/2,handle_temp_view_req/2]).
-export([get_stale_type/1, get_reduce_type/1, parse_view_params/4]).
-export([make_view_fold_fun/6, finish_view_fold/3, view_row_obj/3]).
-export([view_group_etag/1, view_group_etag/2, make_reduce_fold_funs/5]).
-export([design_doc_view/5]).
-import(couch_httpd,
[send_json/2,send_json/3,send_json/4,send_method_not_allowed/2,send_chunk/2,
start_json_response/2, start_json_response/3, end_json_response/1,
send_chunked_error/2]).
design_doc_view(Req, Db, Id, ViewName, Keys) ->
DesignId = <<"_design/", Id/binary>>,
Stale = get_stale_type(Req),
Reduce = get_reduce_type(Req),
Result = case couch_view:get_map_view(Db, DesignId, ViewName, Stale) of
{ok, View, Group} ->
QueryArgs = parse_view_params(Req, Keys, map, strict),
output_map_view(Req, View, Group, Db, QueryArgs, Keys);
{not_found, Reason} ->
case couch_view:get_reduce_view(Db, DesignId, ViewName, Stale) of
{ok, ReduceView, Group} ->
case Reduce of
false ->
QueryArgs = parse_view_params(Req, Keys, red_map, strict),
MapView = couch_view:extract_map_view(ReduceView),
output_map_view(Req, MapView, Group, Db, QueryArgs, Keys);
_ ->
QueryArgs = parse_view_params(Req, Keys, reduce, strict),
output_reduce_view(Req, ReduceView, Group, QueryArgs, Keys)
end;
_ ->
throw({not_found, Reason})
end
end,
couch_stats_collector:increment({httpd, view_reads}),
Result.
handle_view_req(#httpd{method='GET',
path_parts=[_Db, _Design, DName, _View, ViewName]}=Req, Db) ->
design_doc_view(Req, Db, DName, ViewName, nil);
handle_view_req(#httpd{method='POST',
path_parts=[_Db, _Design, DName, _View, ViewName]}=Req, Db) ->
case couch_httpd:json_body(Req) of
{Fields} ->
case proplists:get_value(<<"keys">>, Fields, nil) of
nil ->
Fmt = "POST to view ~p/~p in database ~p with no keys member.",
?LOG_DEBUG(Fmt, [DName, ViewName, Db]),
design_doc_view(Req, Db, DName, ViewName, nil);
Keys when is_list(Keys) ->
design_doc_view(Req, Db, DName, ViewName, Keys);
_ ->
throw({bad_request, "`keys` member must be a array."})
end;
_ ->
throw({bad_request, "Body must be a JSON object"})
end;
handle_view_req(Req, _Db) ->
send_method_not_allowed(Req, "GET,POST,HEAD").
handle_temp_view_req(#httpd{method='POST'}=Req, Db) ->
couch_stats_collector:increment({httpd, temporary_view_reads}),
{Props} = couch_httpd:json_body(Req),
Language = proplists:get_value(<<"language">>, Props, <<"javascript">>),
{DesignOptions} = proplists:get_value(<<"options">>, Props, {[]}),
MapSrc = proplists:get_value(<<"map">>, Props),
Keys = proplists:get_value(<<"keys">>, Props, nil),
case proplists:get_value(<<"reduce">>, Props, null) of
null ->
QueryArgs = parse_view_params(Req, Keys, map, strict),
{ok, View, Group} = couch_view:get_temp_map_view(Db, Language,
DesignOptions, MapSrc),
output_map_view(Req, View, Group, Db, QueryArgs, Keys);
RedSrc ->
QueryArgs = parse_view_params(Req, Keys, reduce, strict),
{ok, View, Group} = couch_view:get_temp_reduce_view(Db, Language,
DesignOptions, MapSrc, RedSrc),
output_reduce_view(Req, View, Group, QueryArgs, Keys)
end;
handle_temp_view_req(Req, _Db) ->
send_method_not_allowed(Req, "POST").
output_map_view(Req, View, Group, Db, QueryArgs, nil) ->
#view_query_args{
limit = Limit,
direction = Dir,
skip = SkipCount,
start_key = StartKey,
start_docid = StartDocId
} = QueryArgs,
CurrentEtag = view_group_etag(Group),
couch_httpd:etag_respond(Req, CurrentEtag, fun() ->
{ok, RowCount} = couch_view:get_row_count(View),
Start = {StartKey, StartDocId},
FoldlFun = make_view_fold_fun(Req, QueryArgs, CurrentEtag, Db, RowCount, #view_fold_helper_funs{reduce_count=fun couch_view:reduce_to_count/1}),
FoldAccInit = {Limit, SkipCount, undefined, []},
FoldResult = couch_view:fold(View, Start, Dir, FoldlFun, FoldAccInit),
finish_view_fold(Req, RowCount, FoldResult)
end);
output_map_view(Req, View, Group, Db, QueryArgs, Keys) ->
#view_query_args{
limit = Limit,
direction = Dir,
skip = SkipCount,
start_docid = StartDocId
} = QueryArgs,
CurrentEtag = view_group_etag(Group, Keys),
couch_httpd:etag_respond(Req, CurrentEtag, fun() ->
{ok, RowCount} = couch_view:get_row_count(View),
FoldAccInit = {Limit, SkipCount, undefined, []},
FoldResult = lists:foldl(
fun(Key, {ok, FoldAcc}) ->
Start = {Key, StartDocId},
FoldlFun = make_view_fold_fun(Req,
QueryArgs#view_query_args{
start_key = Key,
end_key = Key
}, CurrentEtag, Db, RowCount,
#view_fold_helper_funs{
reduce_count = fun couch_view:reduce_to_count/1
}),
couch_view:fold(View, Start, Dir, FoldlFun, FoldAcc)
end, {ok, FoldAccInit}, Keys),
finish_view_fold(Req, RowCount, FoldResult)
end).
output_reduce_view(Req, View, Group, QueryArgs, nil) ->
#view_query_args{
start_key = StartKey,
end_key = EndKey,
limit = Limit,
skip = Skip,
direction = Dir,
start_docid = StartDocId,
end_docid = EndDocId,
group_level = GroupLevel
} = QueryArgs,
CurrentEtag = view_group_etag(Group),
couch_httpd:etag_respond(Req, CurrentEtag, fun() ->
{ok, GroupRowsFun, RespFun} = make_reduce_fold_funs(Req, GroupLevel, QueryArgs, CurrentEtag, #reduce_fold_helper_funs{}),
FoldAccInit = {Limit, Skip, undefined, []},
{ok, {_, _, Resp, _}} = couch_view:fold_reduce(View, Dir, {StartKey, StartDocId},
{EndKey, EndDocId}, GroupRowsFun, RespFun, FoldAccInit),
finish_reduce_fold(Req, Resp)
end);
output_reduce_view(Req, View, Group, QueryArgs, Keys) ->
#view_query_args{
limit = Limit,
skip = Skip,
direction = Dir,
start_docid = StartDocId,
end_docid = EndDocId,
group_level = GroupLevel
} = QueryArgs,
CurrentEtag = view_group_etag(Group),
couch_httpd:etag_respond(Req, CurrentEtag, fun() ->
{ok, GroupRowsFun, RespFun} = make_reduce_fold_funs(Req, GroupLevel, QueryArgs, CurrentEtag, #reduce_fold_helper_funs{}),
{Resp, _RedAcc3} = lists:foldl(
fun(Key, {Resp, RedAcc}) ->
% run the reduce once for each key in keys, with limit etc reapplied for each key
FoldAccInit = {Limit, Skip, Resp, RedAcc},
{_, {_, _, Resp2, RedAcc2}} = couch_view:fold_reduce(View, Dir, {Key, StartDocId},
{Key, EndDocId}, GroupRowsFun, RespFun, FoldAccInit),
% Switch to comma
{Resp2, RedAcc2}
end,
{undefined, []}, Keys), % Start with no comma
finish_reduce_fold(Req, Resp)
end).
reverse_key_default(nil) -> {};
reverse_key_default({}) -> nil;
reverse_key_default(Key) -> Key.
get_stale_type(Req) ->
list_to_atom(couch_httpd:qs_value(Req, "stale", "nil")).
get_reduce_type(Req) ->
list_to_atom(couch_httpd:qs_value(Req, "reduce", "true")).
parse_view_params(Req, Keys, ViewType, IgnoreType) ->
QueryList = couch_httpd:qs(Req),
QueryParams =
lists:foldl(fun({K, V}, Acc) ->
parse_view_param(K, V) ++ Acc
end, [], QueryList),
IsMultiGet = case Keys of
nil -> false;
_ -> true
end,
Args = #view_query_args{
view_type=ViewType,
multi_get=IsMultiGet,
ignore=IgnoreType
},
QueryArgs = lists:foldl(fun({K, V}, Args2) ->
validate_view_query(K, V, Args2)
end, Args, lists:reverse(QueryParams)), % Reverse to match QS order.
GroupLevel = QueryArgs#view_query_args.group_level,
case {ViewType, GroupLevel, IsMultiGet} of
{reduce, exact, true} ->
QueryArgs;
{reduce, _, false} ->
QueryArgs;
{reduce, _, _} ->
Msg = <<"Multi-key fetchs for reduce "
"view must include `group=true`">>,
throw({query_parse_error, Msg});
_ ->
QueryArgs
end,
QueryArgs.
parse_view_param("", _) ->
[];
parse_view_param("key", Value) ->
JsonKey = ?JSON_DECODE(Value),
[{start_key, JsonKey}, {end_key, JsonKey}];
parse_view_param("startkey_docid", Value) ->
[{start_docid, ?l2b(Value)}];
parse_view_param("endkey_docid", Value) ->
[{end_docid, ?l2b(Value)}];
parse_view_param("startkey", Value) ->
[{start_key, ?JSON_DECODE(Value)}];
parse_view_param("endkey", Value) ->
[{end_key, ?JSON_DECODE(Value)}];
parse_view_param("limit", Value) ->
[{limit, parse_positive_int_param(Value)}];
parse_view_param("count", _Value) ->
throw({query_parse_error, <<"Query parameter 'count' is now 'limit'.">>});
parse_view_param("stale", "ok") ->
[{stale, ok}];
parse_view_param("stale", _Value) ->
throw({query_parse_error, <<"stale only available as stale=ok">>});
parse_view_param("update", _Value) ->
throw({query_parse_error, <<"update=false is now stale=ok">>});
parse_view_param("descending", Value) ->
[{descending, parse_bool_param(Value)}];
parse_view_param("skip", Value) ->
[{skip, parse_int_param(Value)}];
parse_view_param("group", Value) ->
case parse_bool_param(Value) of
true -> [{group_level, exact}];
false -> [{group_level, 0}]
end;
parse_view_param("group_level", Value) ->
[{group_level, parse_positive_int_param(Value)}];
parse_view_param("inclusive_end", Value) ->
[{inclusive_end, parse_bool_param(Value)}];
parse_view_param("reduce", Value) ->
[{reduce, parse_bool_param(Value)}];
parse_view_param("include_docs", Value) ->
[{include_docs, parse_bool_param(Value)}];
parse_view_param(Key, Value) ->
[{extra, {Key, Value}}].
validate_view_query(start_key, Value, Args) ->
case Args#view_query_args.multi_get of
true ->
Msg = <<"Query parameter `start_key` is "
"not compatiible with multi-get">>,
throw({query_parse_error, Msg});
_ ->
Args#view_query_args{start_key=Value}
end;
validate_view_query(start_docid, Value, Args) ->
Args#view_query_args{start_docid=Value};
validate_view_query(end_key, Value, Args) ->
case Args#view_query_args.multi_get of
true->
Msg = <<"Query paramter `end_key` is "
"not compatibile with multi-get">>,
throw({query_parse_error, Msg});
_ ->
Args#view_query_args{end_key=Value}
end;
validate_view_query(end_docid, Value, Args) ->
Args#view_query_args{end_docid=Value};
validate_view_query(limit, Value, Args) ->
Args#view_query_args{limit=Value};
validate_view_query(stale, _, Args) ->
Args;
validate_view_query(descending, true, Args) ->
case Args#view_query_args.direction of
rev -> Args; % Already reversed
fwd ->
Args#view_query_args{
direction = rev,
start_key =
reverse_key_default(Args#view_query_args.start_key),
start_docid =
reverse_key_default(Args#view_query_args.start_docid),
end_key =
reverse_key_default(Args#view_query_args.end_key),
end_docid =
reverse_key_default(Args#view_query_args.end_docid)
}
end;
validate_view_query(descending, false, Args) ->
Args; % Ignore default condition
validate_view_query(skip, Value, Args) ->
Args#view_query_args{skip=Value};
validate_view_query(group_level, Value, Args) ->
case Args#view_query_args.view_type of
reduce ->
Args#view_query_args{group_level=Value};
_ ->
Msg = <<"Invalid URL parameter 'group' or "
" 'group_level' for non-reduce view.">>,
throw({query_parse_error, Msg})
end;
validate_view_query(inclusive_end, Value, Args) ->
Args#view_query_args{inclusive_end=Value};
validate_view_query(reduce, _, Args) ->
case Args#view_query_args.view_type of
map ->
Msg = <<"Invalid URL parameter `reduce` for map view.">>,
throw({query_parse_error, Msg});
_ ->
Args
end;
validate_view_query(include_docs, true, Args) ->
case Args#view_query_args.view_type of
reduce ->
Msg = <<"Query paramter `include_docs` "
"is invalid for reduce views.">>,
throw({query_parse_error, Msg});
_ ->
Args#view_query_args{include_docs=true}
end;
validate_view_query(include_docs, _Value, Args) ->
Args;
validate_view_query(extra, {Key, _}, Args) ->
case Args#view_query_args.ignore of
strict ->
Msg = io_lib:format("Invalid URL parameter: ~p", [Key]),
throw({query_parse_error, ?l2b(Msg)});
_ ->
Args
end.
make_view_fold_fun(Req, QueryArgs, Etag, Db, TotalViewCount, HelperFuns) ->
#view_query_args{
end_key = EndKey,
end_docid = EndDocId,
inclusive_end = InclusiveEnd,
direction = Dir
} = QueryArgs,
#view_fold_helper_funs{
passed_end = PassedEndFun,
start_response = StartRespFun,
send_row = SendRowFun,
reduce_count = ReduceCountFun
} = apply_default_helper_funs(HelperFuns,
{Dir, EndKey, EndDocId, InclusiveEnd}),
#view_query_args{
include_docs = IncludeDocs
} = QueryArgs,
fun({{Key, DocId}, Value}, OffsetReds, {AccLimit, AccSkip, Resp, RowFunAcc}) ->
PassedEnd = PassedEndFun(Key, DocId),
case {PassedEnd, AccLimit, AccSkip, Resp} of
{true, _, _, _} ->
% The stop key has been passed, stop looping.
{stop, {AccLimit, AccSkip, Resp, RowFunAcc}};
{_, 0, _, _} ->
% we've done "limit" rows, stop foldling
{stop, {0, 0, Resp, RowFunAcc}};
{_, _, AccSkip, _} when AccSkip > 0 ->
% just keep skipping
{ok, {AccLimit, AccSkip - 1, Resp, RowFunAcc}};
{_, _, _, undefined} ->
% rendering the first row, first we start the response
Offset = ReduceCountFun(OffsetReds),
{ok, Resp2, RowFunAcc0} = StartRespFun(Req, Etag,
TotalViewCount, Offset, RowFunAcc),
{Go, RowFunAcc2} = SendRowFun(Resp2, Db, {{Key, DocId}, Value},
IncludeDocs, RowFunAcc0),
{Go, {AccLimit - 1, 0, Resp2, RowFunAcc2}};
{_, AccLimit, _, Resp} when (AccLimit > 0) ->
% rendering all other rows
{Go, RowFunAcc2} = SendRowFun(Resp, Db, {{Key, DocId}, Value},
IncludeDocs, RowFunAcc),
{Go, {AccLimit - 1, 0, Resp, RowFunAcc2}}
end
end.
make_reduce_fold_funs(Req, GroupLevel, _QueryArgs, Etag, HelperFuns) ->
#reduce_fold_helper_funs{
start_response = StartRespFun,
send_row = SendRowFun
} = apply_default_helper_funs(HelperFuns),
GroupRowsFun =
fun({_Key1,_}, {_Key2,_}) when GroupLevel == 0 ->
true;
({Key1,_}, {Key2,_})
when is_integer(GroupLevel) and is_list(Key1) and is_list(Key2) ->
lists:sublist(Key1, GroupLevel) == lists:sublist(Key2, GroupLevel);
({Key1,_}, {Key2,_}) ->
Key1 == Key2
end,
RespFun = fun
(_Key, _Red, {AccLimit, AccSkip, Resp, RowAcc}) when AccSkip > 0 ->
% keep skipping
{ok, {AccLimit, AccSkip - 1, Resp, RowAcc}};
(_Key, _Red, {0, _AccSkip, Resp, RowAcc}) ->
% we've exhausted limit rows, stop
{stop, {0, _AccSkip, Resp, RowAcc}};
(_Key, Red, {AccLimit, 0, undefined, RowAcc0}) when GroupLevel == 0 ->
% we haven't started responding yet and group=false
{ok, Resp2, RowAcc} = StartRespFun(Req, Etag, RowAcc0),
{Go, RowAcc2} = SendRowFun(Resp2, {null, Red}, RowAcc),
{Go, {AccLimit - 1, 0, Resp2, RowAcc2}};
(_Key, Red, {AccLimit, 0, Resp, RowAcc}) when GroupLevel == 0 ->
% group=false but we've already started the response
{Go, RowAcc2} = SendRowFun(Resp, {null, Red}, RowAcc),
{Go, {AccLimit - 1, 0, Resp, RowAcc2}};
(Key, Red, {AccLimit, 0, undefined, RowAcc0})
when is_integer(GroupLevel), is_list(Key) ->
% group_level and we haven't responded yet
{ok, Resp2, RowAcc} = StartRespFun(Req, Etag, RowAcc0),
{Go, RowAcc2} = SendRowFun(Resp2, {lists:sublist(Key, GroupLevel), Red}, RowAcc),
{Go, {AccLimit - 1, 0, Resp2, RowAcc2}};
(Key, Red, {AccLimit, 0, Resp, RowAcc})
when is_integer(GroupLevel), is_list(Key) ->
% group_level and we've already started the response
{Go, RowAcc2} = SendRowFun(Resp, {lists:sublist(Key, GroupLevel), Red}, RowAcc),
{Go, {AccLimit - 1, 0, Resp, RowAcc2}};
(Key, Red, {AccLimit, 0, undefined, RowAcc0}) ->
% group=true and we haven't responded yet
{ok, Resp2, RowAcc} = StartRespFun(Req, Etag, RowAcc0),
{Go, RowAcc2} = SendRowFun(Resp2, {Key, Red}, RowAcc),
{Go, {AccLimit - 1, 0, Resp2, RowAcc2}};
(Key, Red, {AccLimit, 0, Resp, RowAcc}) ->
% group=true and we've already started the response
{Go, RowAcc2} = SendRowFun(Resp, {Key, Red}, RowAcc),
{Go, {AccLimit - 1, 0, Resp, RowAcc2}}
end,
{ok, GroupRowsFun, RespFun}.
apply_default_helper_funs(#view_fold_helper_funs{
passed_end = PassedEnd,
start_response = StartResp,
send_row = SendRow
}=Helpers, {Dir, EndKey, EndDocId, InclusiveEnd}) ->
PassedEnd2 = case PassedEnd of
undefined -> make_passed_end_fun(Dir, EndKey, EndDocId, InclusiveEnd);
_ -> PassedEnd
end,
StartResp2 = case StartResp of
undefined -> fun json_view_start_resp/5;
_ -> StartResp
end,
SendRow2 = case SendRow of
undefined -> fun send_json_view_row/5;
_ -> SendRow
end,
Helpers#view_fold_helper_funs{
passed_end = PassedEnd2,
start_response = StartResp2,
send_row = SendRow2
}.
apply_default_helper_funs(#reduce_fold_helper_funs{
start_response = StartResp,
send_row = SendRow
}=Helpers) ->
StartResp2 = case StartResp of
undefined -> fun json_reduce_start_resp/3;
_ -> StartResp
end,
SendRow2 = case SendRow of
undefined -> fun send_json_reduce_row/3;
_ -> SendRow
end,
Helpers#reduce_fold_helper_funs{
start_response = StartResp2,
send_row = SendRow2
}.
make_passed_end_fun(fwd, EndKey, EndDocId, InclusiveEnd) ->
case InclusiveEnd of
true ->
fun(ViewKey, ViewId) ->
couch_view:less_json([EndKey, EndDocId], [ViewKey, ViewId])
end;
false ->
fun
(ViewKey, _ViewId) when ViewKey == EndKey ->
true;
(ViewKey, ViewId) ->
couch_view:less_json([EndKey, EndDocId], [ViewKey, ViewId])
end
end;
make_passed_end_fun(rev, EndKey, EndDocId, InclusiveEnd) ->
case InclusiveEnd of
true ->
fun(ViewKey, ViewId) ->
couch_view:less_json([ViewKey, ViewId], [EndKey, EndDocId])
end;
false->
fun
(ViewKey, _ViewId) when ViewKey == EndKey ->
true;
(ViewKey, ViewId) ->
couch_view:less_json([ViewKey, ViewId], [EndKey, EndDocId])
end
end.
json_view_start_resp(Req, Etag, TotalViewCount, Offset, _Acc) ->
{ok, Resp} = start_json_response(Req, 200, [{"Etag", Etag}]),
BeginBody = io_lib:format("{\"total_rows\":~w,\"offset\":~w,\"rows\":[\r\n",
[TotalViewCount, Offset]),
{ok, Resp, BeginBody}.
send_json_view_row(Resp, Db, {{Key, DocId}, Value}, IncludeDocs, RowFront) ->
JsonObj = view_row_obj(Db, {{Key, DocId}, Value}, IncludeDocs),
send_chunk(Resp, RowFront ++ ?JSON_ENCODE(JsonObj)),
{ok, ",\r\n"}.
json_reduce_start_resp(Req, Etag, _Acc0) ->
{ok, Resp} = start_json_response(Req, 200, [{"Etag", Etag}]),
{ok, Resp, "{\"rows\":[\r\n"}.
send_json_reduce_row(Resp, {Key, Value}, RowFront) ->
send_chunk(Resp, RowFront ++ ?JSON_ENCODE({[{key, Key}, {value, Value}]})),
{ok, ",\r\n"}.
view_group_etag(Group) ->
view_group_etag(Group, nil).
view_group_etag(#group{sig=Sig,current_seq=CurrentSeq}, Extra) ->
% This is not as granular as it could be.
% If there are updates to the db that do not effect the view index,
% they will change the Etag. For more granular Etags we'd need to keep
% track of the last Db seq that caused an index change.
couch_httpd:make_etag({Sig, CurrentSeq, Extra}).
% the view row has an error
view_row_obj(_Db, {{Key, error}, Value}, _IncludeDocs) ->
{[{key, Key}, {error, Value}]};
% include docs in the view output
view_row_obj(Db, {{Key, DocId}, {Props}}, true) ->
Rev = case proplists:get_value(<<"_rev">>, Props) of
undefined ->
nil;
Rev0 ->
couch_doc:parse_rev(Rev0)
end,
view_row_with_doc(Db, {{Key, DocId}, {Props}}, Rev);
view_row_obj(Db, {{Key, DocId}, Value}, true) ->
view_row_with_doc(Db, {{Key, DocId}, Value}, nil);
% the normal case for rendering a view row
view_row_obj(_Db, {{Key, DocId}, Value}, _IncludeDocs) ->
{[{id, DocId}, {key, Key}, {value, Value}]}.
view_row_with_doc(Db, {{Key, DocId}, Value}, Rev) ->
?LOG_DEBUG("Include Doc: ~p ~p", [DocId, Rev]),
case (catch couch_httpd_db:couch_doc_open(Db, DocId, Rev, [])) of
{{not_found, missing}, _RevId} ->
{[{id, DocId}, {key, Key}, {value, Value}, {error, missing}]};
{not_found, missing} ->
{[{id, DocId}, {key, Key}, {value, Value}, {error, missing}]};
{not_found, deleted} ->
{[{id, DocId}, {key, Key}, {value, Value}]};
Doc ->
JsonDoc = couch_doc:to_json_obj(Doc, []),
{[{id, DocId}, {key, Key}, {value, Value}, {doc, JsonDoc}]}
end.
finish_view_fold(Req, TotalRows, FoldResult) ->
case FoldResult of
{ok, {_, _, undefined, _}} ->
% nothing found in the view, nothing has been returned
% send empty view
send_json(Req, 200, {[
{total_rows, TotalRows},
{rows, []}
]});
{ok, {_, _, Resp, _}} ->
% end the view
send_chunk(Resp, "\r\n]}"),
end_json_response(Resp);
Error ->
throw(Error)
end.
finish_reduce_fold(Req, Resp) ->
case Resp of
undefined ->
send_json(Req, 200, {[
{rows, []}
]});
Resp ->
send_chunk(Resp, "\r\n]}"),
end_json_response(Resp)
end.
parse_bool_param("true") -> true;
parse_bool_param("false") -> false;
parse_bool_param(Val) ->
Msg = io_lib:format("Invalid value for boolean paramter: ~p", [Val]),
throw({query_parse_error, ?l2b(Msg)}).
parse_int_param(Val) ->
case (catch list_to_integer(Val)) of
IntVal when is_integer(IntVal) ->
IntVal;
_ ->
Msg = io_lib:format("Invalid value for integer parameter: ~p", [Val]),
throw({query_parse_error, ?l2b(Msg)})
end.
parse_positive_int_param(Val) ->
case parse_int_param(Val) of
IntVal when IntVal >= 0 ->
IntVal;
_ ->
Fmt = "Invalid value for positive integer parameter: ~p",
Msg = io_lib:format(Fmt, [Val]),
throw({query_parse_error, ?l2b(Msg)})
end.
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