Add button to remove all datasync settings from DB

seems useful for someone testing, as prep to make the switch

tailbone/templates/datasync/configure.mako

@@ -50,9 +50,57 @@
         </b-button>
         ${h.end_form()}
       </div>
+      <div class="level-item">
+        <b-button type="is-danger"
+                  @click="purgeSettingsInit()"
+                  icon-pack="fas"
+                  icon-left="trash">
+          Remove All Settings
+        </b-button>
+      </div>
     </div>
   </div>
 
+  <b-modal has-modal-card
+           :active.sync="purgeSettingsShowDialog">
+    <div class="modal-card">
+
+      <header class="modal-card-head">
+        <p class="modal-card-title">Remove All Settings</p>
+      </header>
+
+      <section class="modal-card-body">
+        <p class="block">
+          If you like we can remove all DataSync settings from the DB.
+        </p>
+        <p class="block">
+          Note that this tool normally removes all settings first,
+          every time you click "Save Settings".&nbsp; Here though you
+          can "just remove" and <span class="is-italic">not</span>
+          save the current settings.
+        </p>
+      </section>
+
+      <footer class="modal-card-foot">
+        <b-button @click="purgeSettingsShowDialog = false">
+          Cancel
+        </b-button>
+        ${h.form(request.current_route_url())}
+        ${h.csrf_token(request)}
+        ${h.hidden('purge_settings', 'true')}
+        <b-button type="is-danger"
+                  native-type="submit"
+                  :disabled="purgingSettings"
+                  icon-pack="fas"
+                  icon-left="trash"
+                  @click="purgingSettings = true">
+          {{ purgingSettings ? "Working, please wait..." : "Remove All Settings" }}
+        </b-button>
+        ${h.end_form()}
+      </footer>
+    </div>
+  </b-modal>
+
   <b-notification type="is-warning"
                   :active.sync="showConfigFilesNote">
     ## TODO: should link to some ratman page here, yes?
@@ -448,6 +496,9 @@
 
     ThisPageData.restartCommand = ${json.dumps(restart_command)|n}
 
+    ThisPageData.purgeSettingsShowDialog = false
+    ThisPageData.purgingSettings = false
+
     ThisPageData.settingsNeedSaved = false
     ThisPageData.undoChanges = false
     ThisPageData.savingSettings = false
@@ -692,6 +743,10 @@
         }
     }
 
+    ThisPage.methods.purgeSettingsInit = function() {
+        this.purgeSettingsShowDialog = true
+    }
+
     ThisPage.methods.saveSettings = function() {
         this.savingSettings = true
         let url = ${json.dumps(request.current_route_url())|n}

tailbone/views/datasync.py

@@ -30,11 +30,9 @@ import getpass
 import subprocess
 import logging
 
-import sqlalchemy as sa
-
 from rattail.db import model
 from rattail.datasync.config import load_profiles
-from rattail.datasync.util import get_lastrun
+from rattail.datasync.util import get_lastrun, purge_datasync_settings
 
 from tailbone.views import MasterView
 from tailbone.util import csrf_token
@@ -100,11 +98,17 @@ class DataSyncChangeView(MasterView):
         View for configuring the DataSync daemon.
         """
         if self.request.method == 'POST':
-            data = self.request.json_body
+            # if self.request.is_xhr and not self.request.POST:
-            self.save_settings(data)
+            if self.request.POST.get('purge_settings'):
-            self.request.session.flash("Settings have been saved.  "
+                self.delete_settings()
-                                       "You should probably restart DataSync now.")
+                self.request.session.flash("Settings have been removed.")
-            return self.json_response({'success': True})
+                return self.redirect(self.request.current_route_url())
+            else:
+                data = self.request.json_body
+                self.save_settings(data)
+                self.request.session.flash("Settings have been saved.  "
+                                           "You should probably restart DataSync now.")
+                return self.json_response({'success': True})
 
         profiles = load_profiles(self.rattail_config,
                                  include_disabled=True,
@@ -221,28 +225,7 @@ class DataSyncChangeView(MasterView):
                                            value=setting['value']))
 
     def delete_settings(self):
-        model = self.model
+        purge_datasync_settings(self.rattail_config, self.Session())
-
-        to_delete = [
-            'rattail.datasync.watch',
-            'tailbone.datasync.restart',
-        ]
-        for setting in to_delete:
-            setting = self.Session.query(model.Setting).get(setting)
-            if setting:
-                self.Session.delete(setting)
-
-        self.Session.query(model.Setting)\
-                    .filter(sa.or_(
-                        model.Setting.name.like('rattail.datasync.%.watcher'),
-                        model.Setting.name.like('rattail.datasync.%.watcher.db'),
-                        model.Setting.name.like('rattail.datasync.%.watcher.delay'),
-                        model.Setting.name.like('rattail.datasync.%.watcher.retry_attempts'),
-                        model.Setting.name.like('rattail.datasync.%.watcher.retry_delay'),
-                        model.Setting.name.like('rattail.datasync.%.consumers'),
-                        model.Setting.name.like('rattail.datasync.%.consumers.runas'),
-                        model.Setting.name.like('rattail.datasync.%.consumer.%')))\
-                    .delete(synchronize_session=False)
 
     @classmethod
     def defaults(cls, config):