Catch exceptions from backupGroupSession()

src/crypto/algorithms/megolm.js

@@ -269,7 +269,11 @@ MegolmEncryption.prototype._prepareNewSession = async function() {
         this._crypto.backupGroupSession(
             this._roomId, this._olmDevice.deviceCurve25519Key, [],
             sessionId, key.key,
-        );
+        ).catch((e) => {
+            // This throws if the upload failed, but this is fine
+            // since it will have written it to the db and will retry.
+            console.log("Failed to back up group session", e);
+        });
     }
 
     return new OutboundSessionInfo(sessionId);
@@ -855,7 +859,11 @@ MegolmDecryption.prototype.onRoomKeyEvent = function(event) {
                 content.room_id, senderKey, forwardingKeyChain,
                 content.session_id, content.session_key, keysClaimed,
                 exportFormat,
-            );
+            ).catch((e) => {
+                // This throws if the upload failed, but this is fine
+                // since it will have written it to the db and will retry.
+                console.log("Failed to back up group session", e);
+            });
         }
     }).catch((e) => {
         logger.error(`Error handling m.room_key_event: ${e}`);
@@ -984,7 +992,11 @@ MegolmDecryption.prototype.importRoomKey = function(session) {
                 session.session_key,
                 session.sender_claimed_keys,
                 true,
-            );
+            ).catch((e) => {
+                // This throws if the upload failed, but this is fine
+                // since it will have written it to the db and will retry.
+                console.log("Failed to back up group session", e);
+            });
         }
         // have another go at decrypting events sent with this session.
         this._retryDecryption(session.sender_key, session.session_id);