Rename PaymentSendFailure::AllFailedRetrySafe ...ResendSafe

It was pointed out that its quite confusing that
`AllFailedRetrySafe` does not allow you to call `retry_payment`,
though the documentation on it does specify this. Instead, we
simply rename it to `AllFailedResendSafe` to indicate that the
action that is safe to take is *resending*, not *retrying*.

Author: TheBlueMatt

fuzz/src/chanmon_consistency.rs

@@ -283,7 +283,7 @@ fn check_payment_err(send_err: PaymentSendFailure) {
 		PaymentSendFailure::PathParameterError(per_path_results) => {
 			for res in per_path_results { if let Err(api_err) = res { check_api_err(api_err); } }
 		},
-		PaymentSendFailure::AllFailedRetrySafe(per_path_results) => {
+		PaymentSendFailure::AllFailedResendSafe(per_path_results) => {
 			for api_err in per_path_results { check_api_err(api_err); }
 		},
 		PaymentSendFailure::PartialFailure { results, .. } => {

lightning-invoice/src/payment.rs

@@ -543,7 +543,7 @@ where
 			Err(e) => match e {
 				PaymentSendFailure::ParameterError(_) => Err(e),
 				PaymentSendFailure::PathParameterError(_) => Err(e),
-				PaymentSendFailure::AllFailedRetrySafe(_) => {
+				PaymentSendFailure::AllFailedResendSafe(_) => {
 					let mut payment_cache = self.payment_cache.lock().unwrap();
 					let payment_info = payment_cache.get_mut(&payment_hash).unwrap();
 					payment_info.attempts.count += 1;
@@ -655,7 +655,7 @@ where
 				log_trace!(self.logger, "Failed to retry for payment {} due to bogus route/payment data, not retrying.", log_bytes!(payment_hash.0));
 				Err(())
 			},
-			Err(PaymentSendFailure::AllFailedRetrySafe(_)) => {
+			Err(PaymentSendFailure::AllFailedResendSafe(_)) => {
 				self.retry_payment(payment_id, payment_hash, params)
 			},
 			Err(PaymentSendFailure::PartialFailure { failed_paths_retry, results, .. }) => {

lightning/src/ln/channelmanager.rs

@@ -1200,12 +1200,13 @@ pub enum PaymentSendFailure {
 	/// send_payment.
 	PathParameterError(Vec<Result<(), APIError>>),
 	/// All paths which were attempted failed to send, with no channel state change taking place.
-	/// You can freely retry the payment in full (though you probably want to do so over different
+	/// You can freely resend the payment in full (though you probably want to do so over different
 	/// paths than the ones selected).
 	///
-	/// [`ChannelManager::abandon_payment`] does *not* need to be called for this payment and
-	/// [`ChannelManager::retry_payment`] will *not* work for this payment.
-	AllFailedRetrySafe(Vec<APIError>),
+	/// Because the payment failed outright, no payment tracking is done, you do not need to call
+	/// [`ChannelManager::abandon_payment`] and [`ChannelManager::retry_payment`] will *not* work
+	/// for this payment.
+	AllFailedResendSafe(Vec<APIError>),
 	/// Some paths which were attempted failed to send, though possibly not all. At least some
 	/// paths have irrevocably committed to the HTLC and retrying the payment in full would result
 	/// in over-/re-payment.
@@ -2726,7 +2727,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 			// `pending_outbound_payments` map, as the user isn't expected to `abandon_payment`.
 			let removed = self.pending_outbound_payments.lock().unwrap().remove(&payment_id).is_some();
 			debug_assert!(removed, "We should always have a pending payment to remove here");
-			Err(PaymentSendFailure::AllFailedRetrySafe(results.drain(..).map(|r| r.unwrap_err()).collect()))
+			Err(PaymentSendFailure::AllFailedResendSafe(results.drain(..).map(|r| r.unwrap_err()).collect()))
 		} else {
 			Ok(())
 		}

lightning/src/ln/functional_test_utils.rs

@@ -587,7 +587,7 @@ macro_rules! get_local_commitment_txn {
 macro_rules! unwrap_send_err {
 	($res: expr, $all_failed: expr, $type: pat, $check: expr) => {
 		match &$res {
-			&Err(PaymentSendFailure::AllFailedRetrySafe(ref fails)) if $all_failed => {
+			&Err(PaymentSendFailure::AllFailedResendSafe(ref fails)) if $all_failed => {
 				assert_eq!(fails.len(), 1);
 				match fails[0] {
 					$type => { $check },

lightning/src/ln/functional_tests.rs

@@ -1333,7 +1333,7 @@ fn test_basic_channel_reserve() {
 	let (route, our_payment_hash, _, our_payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], max_can_send + 1);
 	let err = nodes[0].node.send_payment(&route, our_payment_hash, &Some(our_payment_secret), PaymentId(our_payment_hash.0)).err().unwrap();
 	match err {
-		PaymentSendFailure::AllFailedRetrySafe(ref fails) => {
+		PaymentSendFailure::AllFailedResendSafe(ref fails) => {
 			match &fails[0] {
 				&APIError::ChannelUnavailable{ref err} =>
 					assert!(regex::Regex::new(r"Cannot send value that would put our balance under counterparty-announced channel reserve value \(\d+\)").unwrap().is_match(err)),