apollo_l2_provider: remove panic on unknown L1 event type; add support for cancellations

Author: guy-starkware

crates/apollo_l1_provider/src/l1_provider.rs

@@ -231,6 +231,13 @@ impl L1Provider {
                             );
                         });
                 }
+                Event::TransactionCanceled(event_data) => {
+                    // TODO(guyn): delete the transaction from the provider.
+                    info!(
+                        "Cancellation finalized with data: {event_data:?}. THIS DOES NOT DELETE \
+                         THE TRANSACTION FROM THE PROVIDER YET."
+                    );
+                }
                 Event::TransactionConsumed { tx_hash, timestamp: consumed_at } => {
                     if let Err(previously_consumed_at) =
                         self.tx_manager.consume_tx(tx_hash, consumed_at, self.clock.unix_now())
@@ -241,7 +248,6 @@ impl L1Provider {
                         );
                     }
                 }
-                _ => return Err(L1ProviderError::unsupported_l1_event(event)),
             }
         }
         Ok(())

crates/apollo_l1_provider/src/l1_scraper.rs

@@ -424,13 +424,6 @@ fn handle_client_error<B: BaseLayerContract + Send + Sync>(
         L1ProviderClientError::L1ProviderError(L1ProviderError::Uninitialized) => {
             Err(L1ScraperError::NeedsRestart)
         }
-        L1ProviderClientError::L1ProviderError(L1ProviderError::UnsupportedL1Event(event)) => {
-            panic!(
-                "Scraper-->Provider consistency error: the event {event} is not supported by the \
-                 provider, but has been scraped and sent to it nonetheless. Check the list of \
-                 tracked events in the scraper and compare to the provider's."
-            )
-        }
         error => panic!("Unexpected error: {error}"),
     }
 }

crates/apollo_l1_provider_types/src/errors.rs

@@ -26,8 +26,6 @@ pub enum L1ProviderError {
     UnexpectedHeight { expected_height: BlockNumber, got: BlockNumber },
     #[error("Cannot transition from {from} to {to}")]
     UnexpectedProviderStateTransition { from: String, to: String },
-    #[error("L1 event not supported: {0}")]
-    UnsupportedL1Event(String),
     #[error("`validate` called while in `Propose` state")]
     ValidateTransactionConsensusBug,
 }
@@ -36,10 +34,6 @@ impl L1ProviderError {
     pub fn unexpected_transition(from: impl ToString, to: impl ToString) -> Self {
         Self::UnexpectedProviderStateTransition { from: from.to_string(), to: to.to_string() }
     }
-
-    pub fn unsupported_l1_event(event: Event) -> Self {
-        Self::UnsupportedL1Event(event.to_string())
-    }
 }
 
 #[derive(Clone, Debug, Error)]