refactor CouchDB startup procedure, see COUCHDB-216 for details

git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@809392 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 53 insertions, 0 deletions

diff --git a/src/couchdb/couch_app.erl b/src/couchdb/couch_app.erl
new file mode 100644
index 00000000..98615e50
--- /dev/null
+++ b/src/couchdb/couch_app.erl
@@ -0,0 +1,53 @@
+% 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_app).
+
+-behaviour(application).
+
+-include("couch_db.hrl").
+
+-export([start/2, stop/1]).
+
+start(_Type, DefaultIniFiles) ->
+    IniFiles = get_ini_files(DefaultIniFiles),
+    case start_apps([crypto, sasl, inets, oauth, ibrowse, mochiweb]) of
+    ok ->
+        couch_server_sup:start_link(IniFiles);
+    {error, Reason} ->
+        {error, Reason}
+    end.
+
+stop(_) ->
+    ok.
+
+get_ini_files(Default) ->
+    case init:get_argument(couch_ini) of
+    error ->
+        Default;
+    {ok, [[]]} ->
+        Default;
+    {ok, [Values]} ->
+        Values
+    end.
+
+start_apps([]) ->
+    ok;
+start_apps([App|Rest]) ->
+    case application:start(App) of
+    ok ->
+       start_apps(Rest);
+    {error, {already_started, App}} ->
+       start_apps(Rest);
+    {error, _Reason} ->
+       {error, {app_would_not_start, App}}
+    end.