Add a shortcut to restart the sync for an account from scratch.

packages/local-sync/src/local-api/routes/auth.js

@@ -55,16 +55,13 @@ const buildAccountWith = ({name, email, provider, settings, credentials}) => {
       account.setCredentials(credentials);
 
       return account.save().then((saved) =>
-        AccountToken.create({accountId: saved.id}).then((token) =>
-          LocalDatabaseConnector.ensureAccountDatabase(saved.id).then(() => {
-            SyncProcessManager.addWorkerForAccount(saved);
-
-            return Promise.resolve({
-              account: saved,
-              token: token,
-            });
-          })
-        )
+        AccountToken.create({accountId: saved.id}).then((token) => {
+          SyncProcessManager.addWorkerForAccount(saved);
+          return Promise.resolve({
+            account: saved,
+            token: token,
+          });
+        })
       );
     });
   });

packages/local-sync/src/local-sync-dashboard/root.jsx

@@ -45,7 +45,13 @@ class AccountCard extends React.Component {
           SyncProcessManager.wakeWorkerForAccount(account);
         });
       })
-    })
+    });
+  }
+
+  onResetSync = () => {
+    SyncProcessManager.removeWorkerForAccountId(this.props.account.id);
+    LocalDatabaseConnector.destroyAccountDatabase(this.props.account.id);
+    SyncProcessManager.addWorkerForAccount(this.props.account);
   }
 
   renderError() {
@@ -89,6 +95,7 @@ class AccountCard extends React.Component {
         style={{top: `${position.top}px`, left: `${position.left}px`}}
       >
         <h3>{account.emailAddress} [{account.id}]</h3>
+        <button name="Reset sync" onClick={this.onResetSync}>Reset sync</button>
         <SyncbackRequestDetails accountId={account.id} />
         <div className="stats">
           <b>First Sync Duration (sec)</b>:

packages/local-sync/src/local-sync-worker/sync-process-manager.js

@@ -50,15 +50,18 @@ class SyncProcessManager {
   }
 
   addWorkerForAccount(account) {
-    return LocalDatabaseConnector.forAccount(account.id).then((db) => {
-      if (this._workers[account.id]) {
-        return Promise.reject(new Error("Local worker already exists"));
-      }
+    return LocalDatabaseConnector.ensureAccountDatabase(account.id)
+    .then(() => {
+      return LocalDatabaseConnector.forAccount(account.id).then((db) => {
+        if (this._workers[account.id]) {
+          return Promise.reject(new Error("Local worker already exists"));
+        }
 
-      this._workers[account.id] = new SyncWorker(account, db, () => {
-        this.removeWorkerForAccountId(account.id)
-      });
-      return Promise.resolve();
+        this._workers[account.id] = new SyncWorker(account, db, () => {
+          this.removeWorkerForAccountId(account.id)
+        });
+        return Promise.resolve();
+      })
     })
     .then(() => {
       this._logger.info({account_id: account.id}, `ProcessManager: Claiming Account Succeeded`)
@@ -69,6 +72,8 @@ class SyncProcessManager {
   }
 
   removeWorkerForAccountId(accountId) {
+    const worker = this._workers[accountId];
+    worker.cleanup();
     this._workers[accountId] = null;
   }
 

packages/local-sync/src/shared/local-database-connector.js

@@ -60,7 +60,12 @@ class LocalDatabaseConnector {
 
   destroyAccountDatabase(accountId) {
     const dbname = `a-${accountId}`;
-    fs.removeFileSync(path.join(process.env.NYLAS_HOME, `${dbname}.sqlite`));
+    fs.access(dbname, fs.F_OK, (err) => {
+      if (!err) {
+        fs.unlinkSync(path.join(process.env.NYLAS_HOME, `${dbname}.sqlite`));
+      }
+    });
+
     return Promise.resolve()
   }