Add code for revision cleanup (#6442)

* Add initial code for revision cleanup

* Some improvements - code cleanup

* Cleanup logging

* Add button in admin backend to cleanup revisions of a specific pad

* Disable cleanup by default and show errors in admin area

* Improve cleanup code

* Load revisions for cleanup in parallel

* Consider saved revisions during pad cleanup

src/node/hooks/express/adminsettings.ts

@@ -13,6 +13,7 @@ const settings = require('../../utils/Settings');
 const UpdateCheck = require('../../utils/UpdateCheck');
 const padManager = require('../../db/PadManager');
 const api = require('../../db/API');
+const cleanup = require('../../utils/Cleanup');
 
 
 const queryPadLimit = 12;
@@ -252,6 +253,40 @@ exports.socketio = (hookName: string, {io}: any) => {
             }
         })
 
+        socket.on('cleanupPadRevisions', async (padId: string) => {
+          if (!settings.cleanup.enabled) {
+            socket.emit('results:cleanupPadRevisions', {
+              error: 'Cleanup disabled. Enable cleanup in settings.json: cleanup.enabled => true',
+            });
+            return;
+          }
+
+          const padExists = await padManager.doesPadExists(padId);
+          if (padExists) {
+            logger.info(`Cleanup pad revisions: ${padId}`);
+            try {
+              const result = await cleanup.deleteRevisions(padId, settings.cleanup.keepRevisions)
+              if (result) {
+                socket.emit('results:cleanupPadRevisions', {
+                  padId: padId,
+                  keepRevisions: settings.cleanup.keepRevisions,
+                });
+                logger.info('successful cleaned up pad: ', padId)
+              } else {
+                socket.emit('results:cleanupPadRevisions', {
+                  error: 'Error cleaning up pad',
+                });
+              }
+            } catch (err: any) {
+              logger.error(`Error in pad ${padId}: ${err.stack || err}`);
+              socket.emit('results:cleanupPadRevisions', {
+                error: err.toString(),
+              });
+              return;
+            }
+          }
+        })
+
         socket.on('restartServer', async () => {
             logger.info('Admin request to restart server through a socket on /admin/settings');
             settings.reloadSettings();