hyperlight-host 0.17.0

A lightweight Virtual Machine Manager that can be hosted in an application to safely run untrusted or code within a VM partition with very low latency and overhead.
Documentation 
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2025 The Hyperlight Authors.

use serde_json::{Map, Value};

use crate::{Result, new_error};

/// Call `check_value_as_str` and panic if it returned an `Err`. Otherwise,
/// do nothing.
#[track_caller]
pub(crate) fn test_value_as_str(values: &Map<String, Value>, key: &str, expected_value: &str) {
    if let Err(e) = check_value_as_str(values, key, expected_value) {
        panic!("{e:?}");
    }
}

/// Check to see if the value in `values` for key `key` matches
/// `expected_value`. If so, return `Ok(())`. Otherwise, return an `Err`
/// indicating the mismatch.
pub(crate) fn check_value_as_str(
    values: &Map<String, Value>,
    key: &str,
    expected_value: &str,
) -> Result<()> {
    let value = try_to_string(values, key)?;
    if expected_value != value {
        return Err(new_error!(
            "expected value {} != value {}",
            expected_value,
            value
        ));
    }
    Ok(())
}

/// Fetch the value in `values` with key `key` and, if it existed, convert
/// it to a string. If all those steps succeeded, return an `Ok` with the
/// string value inside. Otherwise, return an `Err`.
fn try_to_string<'a>(values: &'a Map<String, Value>, key: &'a str) -> Result<&'a str> {
    if let Some(value) = values.get(key) {
        if let Some(value_str) = value.as_str() {
            Ok(value_str)
        } else {
            Err(new_error!("value with key {} was not a string", key))
        }
    } else {
        Err(new_error!("value for key {} was not found", key))
    }
}