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% Copyright 2010 Cloudant
%
% 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(fabric).
-include_lib("mem3/include/mem3.hrl").
-include_lib("couch/include/couch_db.hrl").
% DBs
-export([all_dbs/0, all_dbs/1, create_db/1, create_db/2, delete_db/1,
delete_db/2, get_db_info/1, get_doc_count/1, set_revs_limit/3,
set_security/3, get_revs_limit/1, get_security/1]).
% Documents
-export([open_doc/3, open_revs/4, get_missing_revs/2, update_doc/3,
update_docs/3, att_receiver/2]).
% Views
-export([all_docs/4, changes/4, query_view/3, query_view/4, query_view/6,
get_view_group_info/2]).
% miscellany
-export([design_docs/1, reset_validation_funs/1, cleanup_index_files/0,
cleanup_index_files/1]).
-include("fabric.hrl").
% db operations
all_dbs() ->
all_dbs(<<>>).
all_dbs(Prefix) when is_list(Prefix) ->
all_dbs(list_to_binary(Prefix));
all_dbs(Prefix) when is_binary(Prefix) ->
Length = byte_size(Prefix),
MatchingDbs = ets:foldl(fun(#shard{dbname=DbName}, Acc) ->
case DbName of
<<Prefix:Length/binary, _/binary>> ->
[DbName | Acc];
_ ->
Acc
end
end, [], partitions),
{ok, lists:usort(MatchingDbs)}.
get_db_info(DbName) ->
fabric_db_info:go(dbname(DbName)).
get_doc_count(DbName) ->
fabric_db_doc_count:go(dbname(DbName)).
create_db(DbName) ->
create_db(DbName, []).
create_db(DbName, Options) ->
fabric_db_create:go(dbname(DbName), opts(Options)).
delete_db(DbName) ->
delete_db(DbName, []).
delete_db(DbName, Options) ->
fabric_db_delete:go(dbname(DbName), opts(Options)).
set_revs_limit(DbName, Limit, Options) when is_integer(Limit), Limit > 0 ->
fabric_db_meta:set_revs_limit(dbname(DbName), Limit, opts(Options)).
get_revs_limit(DbName) ->
{ok, Db} = fabric_util:get_db(dbname(DbName)),
try couch_db:get_revs_limit(Db) after catch couch_db:close(Db) end.
set_security(DbName, SecObj, Options) ->
fabric_db_meta:set_security(dbname(DbName), SecObj, opts(Options)).
get_security(DbName) ->
{ok, Db} = fabric_util:get_db(dbname(DbName)),
try couch_db:get_security(Db) after catch couch_db:close(Db) end.
% doc operations
open_doc(DbName, Id, Options) ->
fabric_doc_open:go(dbname(DbName), docid(Id), opts(Options)).
open_revs(DbName, Id, Revs, Options) ->
fabric_doc_open_revs:go(dbname(DbName), docid(Id), Revs, opts(Options)).
get_missing_revs(DbName, IdsRevs) when is_list(IdsRevs) ->
Sanitized = [idrevs(IdR) || IdR <- IdsRevs],
fabric_doc_missing_revs:go(dbname(DbName), Sanitized).
update_doc(DbName, Doc, Options) ->
case update_docs(DbName, [Doc], opts(Options)) of
{ok, [{ok, NewRev}]} ->
{ok, NewRev};
{ok, [Error]} ->
throw(Error);
{ok, []} ->
% replication success
#doc{revs = {Pos, [RevId | _]}} = doc(Doc),
{ok, {Pos, RevId}}
end.
update_docs(DbName, Docs, Options) ->
try fabric_doc_update:go(dbname(DbName), docs(Docs), opts(Options))
catch {aborted, PreCommitFailures} ->
{aborted, PreCommitFailures}
end.
att_receiver(Req, Length) ->
fabric_doc_attachments:receiver(Req, Length).
all_docs(DbName, Callback, Acc0, #view_query_args{} = QueryArgs) when
is_function(Callback, 2) ->
fabric_view_all_docs:go(dbname(DbName), QueryArgs, Callback, Acc0).
changes(DbName, Callback, Acc0, Options) ->
% TODO use a keylist for Options instead of #changes_args, BugzID 10281
Feed = Options#changes_args.feed,
fabric_view_changes:go(dbname(DbName), Feed, Options, Callback, Acc0).
query_view(DbName, DesignName, ViewName) ->
query_view(DbName, DesignName, ViewName, #view_query_args{}).
query_view(DbName, DesignName, ViewName, QueryArgs) ->
Callback = fun default_callback/2,
query_view(DbName, DesignName, ViewName, Callback, [], QueryArgs).
query_view(DbName, Design, ViewName, Callback, Acc0, QueryArgs) ->
Db = dbname(DbName), View = name(ViewName),
case is_reduce_view(Db, Design, View, QueryArgs) of
true ->
Mod = fabric_view_reduce;
false ->
Mod = fabric_view_map
end,
Mod:go(Db, Design, View, QueryArgs, Callback, Acc0).
get_view_group_info(DbName, DesignId) ->
fabric_group_info:go(dbname(DbName), design_doc(DesignId)).
design_docs(DbName) ->
QueryArgs = #view_query_args{start_key = <<"_design/">>, include_docs=true},
Callback = fun({total_and_offset, _, _}, []) ->
{ok, []};
({row, {Props}}, Acc) ->
case couch_util:get_value(id, Props) of
<<"_design/", _/binary>> ->
{ok, [couch_util:get_value(doc, Props) | Acc]};
_ ->
{stop, Acc}
end;
(complete, Acc) ->
{ok, lists:reverse(Acc)}
end,
fabric:all_docs(dbname(DbName), Callback, [], QueryArgs).
reset_validation_funs(DbName) ->
[rexi:cast(Node, {fabric_rpc, reset_validation_funs, [Name]}) ||
#shard{node=Node, name=Name} <- mem3:shards(DbName)].
cleanup_index_files() ->
{ok, DbNames} = fabric:all_dbs(),
[cleanup_index_files(Name) || Name <- DbNames].
cleanup_index_files(DbName) ->
{ok, DesignDocs} = fabric:design_docs(DbName),
ActiveSigs = lists:map(fun(#doc{id = GroupId}) ->
{ok, Info} = fabric:get_view_group_info(DbName, GroupId),
binary_to_list(couch_util:get_value(signature, Info))
end, [couch_doc:from_json_obj(DD) || DD <- DesignDocs]),
FileList = filelib:wildcard([couch_config:get("couchdb", "view_index_dir"),
"/.shards/*/", couch_util:to_list(DbName), "_design/*"]),
DeleteFiles = if ActiveSigs =:= [] -> FileList; true ->
{ok, RegExp} = re:compile([$(, string:join(ActiveSigs, "|"), $)]),
lists:filter(fun(FilePath) ->
re:run(FilePath, RegExp, [{capture, none}]) == nomatch
end, FileList)
end,
[file:delete(File) || File <- DeleteFiles],
ok.
%% some simple type validation and transcoding
dbname(DbName) when is_list(DbName) ->
list_to_binary(DbName);
dbname(DbName) when is_binary(DbName) ->
DbName;
dbname(#db{name=Name}) ->
Name;
dbname(DbName) ->
erlang:error({illegal_database_name, DbName}).
name(Thing) ->
couch_util:to_binary(Thing).
docid(DocId) when is_list(DocId) ->
list_to_binary(DocId);
docid(DocId) when is_binary(DocId) ->
DocId;
docid(DocId) ->
erlang:error({illegal_docid, DocId}).
docs(Docs) when is_list(Docs) ->
[doc(D) || D <- Docs];
docs(Docs) ->
erlang:error({illegal_docs_list, Docs}).
doc(#doc{} = Doc) ->
Doc;
doc({_} = Doc) ->
couch_doc:from_json_obj(Doc);
doc(Doc) ->
erlang:error({illegal_doc_format, Doc}).
design_doc(#doc{} = DDoc) ->
DDoc;
design_doc(DocId) when is_list(DocId) ->
design_doc(list_to_binary(DocId));
design_doc(<<"_design/", _/binary>> = DocId) ->
DocId;
design_doc(GroupName) ->
<<"_design/", GroupName/binary>>.
idrevs({Id, Revs}) when is_list(Revs) ->
{docid(Id), [rev(R) || R <- Revs]}.
rev(Rev) when is_list(Rev); is_binary(Rev) ->
couch_doc:parse_rev(Rev);
rev({Seq, Hash} = Rev) when is_integer(Seq), is_binary(Hash) ->
Rev.
opts(Options) ->
case couch_util:get_value(user_ctx, Options) of
undefined ->
case erlang:get(user_ctx) of
#user_ctx{} = Ctx ->
[{user_ctx, Ctx} | Options];
_ ->
Options
end;
_ ->
Options
end.
default_callback(complete, Acc) ->
{ok, lists:reverse(Acc)};
default_callback(Row, Acc) ->
{ok, [Row | Acc]}.
is_reduce_view(_, _, _, #view_query_args{view_type=Reduce}) ->
Reduce =:= reduce.
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