Function apply_optional_port_env

nodedb/src/config/server/env.rs:81–101

Parse a u16 port from an env var into an optional field (enables the listener).

(var: &str, target: &mut Option<u16>)

/// Parse a u16 port from an env var into an optional field (enables the listener).
fn apply_optional_port_env(var: &str, target: &mut Option<u16>) {
    if let Ok(val) = std::env::var(var) {
        match val.trim().parse::<u16>() {
            Ok(port) => {
                tracing::info!(
                    env_var = var,
                    value = port,
                    "environment variable override applied"
                );
                *target = Some(port);
            }
            Err(_) => {
                tracing::warn!(
                    env_var = var,
                    value = %val,
                    "ignoring malformed environment variable (expected port number), using config value"
                );
            }
        }
    }
}

/// Parse a boolean env var ("true"/"false") into a bool field.
fn apply_bool_env(var: &str, target: &mut bool) {