Function code_error

crates/core/src/host/v8/syscall/v2.rs:309–335

Construct a `SpacetimeHostError` value given an errno and message.

(
    scope: &mut PinScope<'scope, '_>,
    code: u16,
    message: Option<&str>,
)

/// Construct a `SpacetimeHostError` value given an errno and message.
fn code_error<'scope>(
    scope: &mut PinScope<'scope, '_>,
    code: u16,
    message: Option<&str>,
) -> ExcResult<ExceptionValue<'scope>> {
    const DEFAULT_MESSAGE: &StringConst = &StringConst::new("Unknown error");
    let message = match message {
        Some(msg) => msg.into_string(scope).map_err(|e| e.into_range_error().throw(scope))?,
        None => strerror(code).unwrap_or(DEFAULT_MESSAGE).string(scope),
    };
    let exc = match scope
        .get_current_context()
        .get_embedder_data(scope, super::super::GET_ERROR_CONSTRUCTOR_SLOT)
    {
        // get_error_constructor: (code: number) => new (message: string) => Error
        Some(get_error_constructor) => {
            let errno_value = code.to_value(scope);
            let cls = call_free_fun(scope, get_error_constructor.cast(), &[errno_value])?;
            let cls = cast!(scope, cls, v8::Function, "function").map_err(|e| e.throw(scope))?;
            cls.new_instance(scope, &[message.into()])
                .ok_or_else(exception_already_thrown)?
                .into()
        }
        None => v8::Exception::error(scope, message),
    };
    Ok(ExceptionValue(exc))
}

/// Turns a [`NodesError`] into a thrown exception.
fn throw_nodes_error(abi_call: AbiCall, scope: &mut PinScope<'_, '_>, error: NodesError) -> ExceptionThrown {