ln: improve error message for blinded trampoline check failure

carlaKC · carlaKC · commit c42f094072bc · 2025-12-01T14:50:34.000-05:00
diff --git a/lightning/src/ln/onion_payment.rs b/lightning/src/ln/onion_payment.rs
@@ -649,7 +649,7 @@ where
 			) {
 				Ok((amt, cltv)) => (amt, cltv),
 				Err(()) => {
-					return encode_relay_error("Trampoline blinded forward amt or CLTV values exceeded the outer onion's",
+					return encode_relay_error("Underflow calculating outbound amount or cltv value for blinded trampoline forward",
 						LocalHTLCFailureReason::InvalidOnionBlinding, outer_shared_secret.secret_bytes(), Some(trampoline_shared_secret.secret_bytes()), &[0; 32]);
 				}
 			};

Original file line number	Diff line number	Diff line change
`@@ -649,7 +649,7 @@ where`
`649`	`649`	`) {`
`650`	`650`	`Ok((amt, cltv)) => (amt, cltv),`
`651`	`651`	`Err(()) => {`
`652`		`- return encode_relay_error("Trampoline blinded forward amt or CLTV values exceeded the outer onion's",`
	`652`	`+ return encode_relay_error("Underflow calculating outbound amount or cltv value for blinded trampoline forward",`
`653`	`653`	`LocalHTLCFailureReason::InvalidOnionBlinding, outer_shared_secret.secret_bytes(), Some(trampoline_shared_secret.secret_bytes()), &[0; 32]);`
`654`	`654`	`}`
`655`	`655`	`};`