Function parse_label_selector

crates/openshell-server/src/persistence/mod.rs:554–586

Parse a simple label selector string into key-value pairs. Format: "key1=value1,key2=value2" Returns a `HashMap` of label requirements. Note: Input validation should be performed at the gRPC layer using `grpc::validation::validate_label_selector()` before calling this function. Errors returned here indicate unexpected internal errors, not user input errors.

(selector: &str)

/// `grpc::validation::validate_label_selector()` before calling this function.
/// Errors returned here indicate unexpected internal errors, not user input errors.
pub fn parse_label_selector(selector: &str) -> PersistenceResult<HashMap<String, String>> {
    if selector.is_empty() {
        return Ok(HashMap::new());
    }

    let mut labels = HashMap::new();
    for pair in selector.split(',') {
        let pair = pair.trim();
        if pair.is_empty() {
            continue;
        }

        let parts: Vec<&str> = pair.splitn(2, '=').collect();
        if parts.len() != 2 {
            return Err(PersistenceError::Decode(format!(
                "invalid label selector: expected 'key=value', got '{pair}'"
            )));
        }

        let key = parts[0].trim();
        let value = parts[1].trim();

        if key.is_empty() {
            return Err(PersistenceError::Decode(format!(
                "invalid label selector: key cannot be empty in '{pair}'"
            )));
        }

        labels.insert(key.to_string(), value.to_string());
    }

    Ok(labels)
}

/// Unconditional write helpers — test-only.
///