f document input size fluctuation

TheBlueMatt · TheBlueMatt · commit 86f0cf2fab6c · 2021-10-20T01:03:09.000Z
diff --git a/lightning/src/chain/keysinterface.rs b/lightning/src/chain/keysinterface.rs
@@ -1017,7 +1017,9 @@ impl KeysManager {
 		}
 
 		debug_assert!(expected_max_weight >= spend_tx.get_weight());
-		debug_assert!(expected_max_weight <= spend_tx.get_weight() + descriptors.len() * 4);
+		// Note that witnesses with a signature vary somewhat in size, so allow
+		// `expected_max_weight` to overshoot by up to 3 bytes per input.
+		debug_assert!(expected_max_weight <= spend_tx.get_weight() + descriptors.len() * 3);
 
 		Ok(spend_tx)
 	}

Original file line number	Diff line number	Diff line change
`@@ -1017,7 +1017,9 @@ impl KeysManager {`
`1017`	`1017`	`}`
`1018`	`1018`
`1019`	`1019`	`debug_assert!(expected_max_weight >= spend_tx.get_weight());`
`1020`		`- debug_assert!(expected_max_weight <= spend_tx.get_weight() + descriptors.len() * 4);`
	`1020`	`+ // Note that witnesses with a signature vary somewhat in size, so allow`
	`1021`	+ // `expected_max_weight` to overshoot by up to 3 bytes per input.
	`1022`	`+ debug_assert!(expected_max_weight <= spend_tx.get_weight() + descriptors.len() * 3);`
`1021`	`1023`
`1022`	`1024`	`Ok(spend_tx)`
`1023`	`1025`	`}`