Validation utilities for gossip protocol field values.
Validates that a value is a non-empty lowercase ASCII token.
Validates that a value is a non-empty lowercase ASCII token.
the field name, used in error messages
the value to validate
the value or an error message
Validates that a value is a valid gossip topic string.
Validates that a value is a valid gossip topic string.
the topic string to validate
the value or an error message
Validates that a value is a canonical lowercase UUIDv4 string.
Validates that a value is a canonical lowercase UUIDv4 string.
the field name, used in error messages
the UUID string to validate; uppercase forms are rejected to keep the wire representation canonical
the validated UUID string or an error message