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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_server).
-behaviour(gen_server).
-behaviour(application).
-export([start/0,start/1,start/2,stop/0,stop/1]).
-export([open/1,create/2,delete/1,all_databases/0,get_version/0]).
-export([init/1, handle_call/3,sup_start_link/2]).
-export([handle_cast/2,code_change/3,handle_info/2,terminate/2]).
-export([dev_start/0,remote_restart/0]).
-include("couch_db.hrl").
-record(server,{
root_dir = [],
dbname_regexp,
options=[]
}).
start() ->
start("").
start(IniFile) when is_atom(IniFile) ->
couch_server_sup:start_link(atom_to_list(IniFile) ++ ".ini");
start(IniNum) when is_integer(IniNum) ->
couch_server_sup:start_link("couch" ++ integer_to_list(IniNum) ++ ".ini");
start(IniFile) ->
couch_server_sup:start_link(IniFile).
start(_Type, _Args) ->
start().
stop() ->
couch_server_sup:stop().
stop(_Reason) ->
stop().
dev_start() ->
stop(),
up_to_date = make:all([load, debug_info]),
start().
get_version() ->
Apps = application:loaded_applications(),
case lists:keysearch(couch, 1, Apps) of
{value, {_, _, Vsn}} ->
Vsn;
false ->
"0.0.0"
end.
sup_start_link(RootDir, Options) ->
gen_server:start_link({local, couch_server}, couch_server, {RootDir, Options}, []).
open(Filename) ->
gen_server:call(couch_server, {open, Filename}).
create(Filename, Options) ->
gen_server:call(couch_server, {create, Filename, Options}).
delete(Filename) ->
gen_server:call(couch_server, {delete, Filename}).
remote_restart() ->
gen_server:call(couch_server, remote_restart).
init({RootDir, Options}) ->
{ok, RegExp} = regexp:parse("^[a-z][a-z0-9\\_\\$()\\+\\-\\/]*$"),
{ok, #server{root_dir=RootDir, dbname_regexp=RegExp, options=Options}}.
check_filename(#server{dbname_regexp=RegExp}, Filename) ->
case regexp:match(Filename, RegExp) of
nomatch ->
{error, illegal_database_name};
_Match ->
ok
end.
get_full_filename(Server, Filename) ->
filename:join([Server#server.root_dir, "./" ++ Filename ++ ".couch"]).
terminate(_Reason, _Server) ->
ok.
all_databases() ->
{ok, Root} = gen_server:call(couch_server, get_root),
Filenames =
filelib:fold_files(Root, "^[a-z0-9\\_\\$()\\+\\-]*[\\.]couch$", true,
fun(Filename, AccIn) ->
case Filename -- Root of
[$/ | RelativeFilename] -> ok;
RelativeFilename -> ok
end,
[filename:rootname(RelativeFilename, ".couch") | AccIn]
end, []),
{ok, Filenames}.
handle_call(get_root, _From, #server{root_dir=Root}=Server) ->
{reply, {ok, Root}, Server};
handle_call({open, Filename}, From, Server) ->
case check_filename(Server, Filename) of
{error, Error} ->
{reply, {error, Error}, Server};
ok ->
Filepath = get_full_filename(Server, Filename),
Result = supervisor:start_child(couch_server_sup,
{Filename,
{couch_db, open, [Filename, Filepath]},
transient ,
infinity,
supervisor,
[couch_db]}),
case Result of
{ok, Db} ->
{reply, {ok, Db}, Server};
{error, already_present} ->
ok = supervisor:delete_child(couch_server_sup, Filename),
% call self recursively
handle_call({open, Filename}, From, Server);
{error, {already_started, Db}} ->
{reply, {ok, Db}, Server};
{error, {not_found, _}} ->
{reply, not_found, Server};
{error, {Error, _}} ->
{reply, {error, Error}, Server}
end
end;
handle_call({create, Filename, Options}, _From, Server) ->
case check_filename(Server, Filename) of
{error, Error} ->
{reply, {error, Error}, Server};
ok ->
Filepath = get_full_filename(Server, Filename),
ChildSpec = {Filename,
{couch_db, create, [Filename, Filepath, Options]},
transient,
infinity,
supervisor,
[couch_db]},
Result =
case supervisor:delete_child(couch_server_sup, Filename) of
ok ->
sup_start_child(couch_server_sup, ChildSpec);
{error, not_found} ->
sup_start_child(couch_server_sup, ChildSpec);
{error, running} ->
% a server process for this database already started. Maybe kill it
case lists:member(overwrite, Options) of
true ->
supervisor:terminate_child(couch_server_sup, Filename),
ok = supervisor:delete_child(couch_server_sup, Filename),
sup_start_child(couch_server_sup, ChildSpec);
false ->
{error, database_already_exists}
end
end,
case Result of
{ok, _Db} -> couch_db_update_notifier:notify({created, Filename});
_ -> ok
end,
{reply, Result, Server}
end;
handle_call({delete, Filename}, _From, Server) ->
FullFilepath = get_full_filename(Server, Filename),
supervisor:terminate_child(couch_server_sup, Filename),
supervisor:delete_child(couch_server_sup, Filename),
case file:delete(FullFilepath) of
ok ->
couch_db_update_notifier:notify({deleted, Filename}),
{reply, ok, Server};
{error, enoent} ->
{reply, not_found, Server};
Else ->
{reply, Else, Server}
end;
handle_call(remote_restart, _From, #server{options=Options}=Server) ->
case proplists:get_value(remote_restart, Options) of
true ->
exit(self(), restart);
_ ->
ok
end,
{reply, ok, Server}.
% this function is just to strip out the child spec error stuff if hit
sup_start_child(couch_server_sup, ChildSpec) ->
case supervisor:start_child(couch_server_sup, ChildSpec) of
{error, {Error, _ChildInfo}} ->
{error, Error};
Else ->
Else
end.
handle_cast(_Msg, State) ->
{noreply,State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
handle_info(_Info, State) ->
{noreply, State}.
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