Struct ExpverHandler 

pub struct ExpverHandler;

Experiment version validation handler

Handles experiment version identifiers for different runs and model versions

• Numeric versions: Integers that are zero-padded to 4 digits (e.g., 1 → “0001”)
• String versions: Alphanumeric identifiers converted to lowercase (e.g., “PROD” → “prod”)

The canonicalization ensures consistent representation for topic generation and database storage while supporting the flexibility needed by different operational workflows.

Implementations

impl ExpverHandler

pub fn validate_and_canonicalize( value: &str, default: Option<&str>, field_name: &str, ) -> Result<String>

Validate and canonicalize an experiment version value

This method handles both numeric and string experiment versions:

• Numeric values are zero-padded to 4 digits for consistency
• String values are converted to lowercase for standardization
• Empty values use the configured default if available

Arguments

• value - The experiment version to validate (can be empty if default provided)
• default - Optional default value to use when input is empty
• field_name - Name of the field being validated (for error messages)

Returns

• Ok(String) - The canonicalized experiment version
• Err(anyhow::Error) - Empty value with no default provided