processes: add a way to control processes via gunicorn control.

- allows web based adding/removing workers

rhodecode/apps/admin/__init__.py

@@ -75,6 +75,9 b' def admin_routes(config):'
     config.add_route(
         name='admin_settings_process_management_signal',
         pattern='/settings/process_management/signal')
+    config.add_route(
+        name='admin_settings_process_management_master_signal',
+        pattern='/settings/process_management/master_signal')
 
     # default settings
     config.add_route(

rhodecode/apps/admin/views/process_management.py

@@ -21,6 +21,7 b''
 import logging
 
 import psutil
+import signal
 from pyramid.view import view_config
 
 from rhodecode.apps._base import BaseAppView
@@ -101,3 +102,32 b' class AdminProcessManagementView(BaseApp'
             p.kill()
 
         return {'result': result}
+
+    @LoginRequired()
+    @HasPermissionAllDecorator('hg.admin')
+    @CSRFRequired()
+    @view_config(
+        route_name='admin_settings_process_management_master_signal',
+        request_method='POST', renderer='json_ext')
+    def process_management_master_signal(self):
+        pid_data = self.request.json.get('pid_data', {})
+        pid = safe_int(pid_data['pid'])
+        action = pid_data['action']
+        if pid:
+            try:
+                proc = psutil.Process(pid)
+            except psutil.NoSuchProcess:
+                return {'result': 'failure_no_such_process'}
+
+            children = proc.children(recursive=True)
+            if children:
+                # master process
+                if action == '+' and len(children) <= 20:
+                    proc.send_signal(signal.SIGTTIN)
+                elif action == '-' and len(children) >= 2:
+                    proc.send_signal(signal.SIGTTOU)
+                else:
+                    return {'result': 'failure_wrong_action'}
+                return {'result': 'success'}
+
+        return {'result': 'failure_not_master'}

rhodecode/public/js/rhodecode/routes.js

@@ -50,6 +50,7 b' function registerRCRoutes() {'
     pyroutes.register('admin_settings_process_management', '/_admin/settings/process_management', []);
     pyroutes.register('admin_settings_process_management_data', '/_admin/settings/process_management/data', []);
     pyroutes.register('admin_settings_process_management_signal', '/_admin/settings/process_management/signal', []);
+    pyroutes.register('admin_settings_process_management_master_signal', '/_admin/settings/process_management/master_signal', []);
     pyroutes.register('admin_defaults_repositories', '/_admin/defaults/repositories', []);
     pyroutes.register('admin_defaults_repositories_update', '/_admin/defaults/repositories/update', []);
     pyroutes.register('admin_settings', '/_admin/settings', []);

rhodecode/templates/admin/settings/settings_process_management.mako

@@ -105,5 +105,34 b' disableAutoRefresh = function() {'
   autoRefresh(false)
 };
 
+masterAction = function(pid, action) {
+    $.ajax({
+        url: pyroutes.url('admin_settings_process_management_master_signal'),
+        headers: {
+            "X-CSRF-Token": CSRF_TOKEN,
+        },
+        data: JSON.stringify({'pid_data': {'pid': pid, 'action': action}}),
+        dataType: 'json',
+        type: 'POST',
+        contentType: "application/json; charset=utf-8",
+        success: function (data) {
+
+        },
+        failure: function (data) {
+
+        },
+        error: function (data) {
+
+        }
+    })
+};
+
+addWorker = function(pid) {
+    masterAction(pid, '+');
+};
+
+removeWorker = function(pid) {
+    masterAction(pid, '-');
+};
 
 </script>

rhodecode/templates/admin/settings/settings_process_management_data.mako

@@ -43,6 +43,9 b''
             </td>
             <td>
                 MASTER
+                % if request.GET.get('dev'):
+                    | <a href="#addWorker" onclick="addWorker(${proc.pid}); return false">ADD</a> | <a href="#removeWorker" onclick="removeWorker(${proc.pid}); return false">REMOVE</a>
+                % endif
             </td>
         </tr>
         <% mem_sum = 0 %>
@@ -87,7 +90,6 b''
             <td></td>
         </tr>
         <tr><td> <code> -- </code> </td></tr>
-
         % endif
     % endfor
 </table>