scion-stack 0.7.0

// Copyright 2025 Anapaya Systems
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Simple end-to-end test for PocketScion utilizing a topology

use std::str::FromStr;

use anyhow::{Context, Ok};
use chrono::Utc;
use ntest::timeout;
use pocketscion::{
    network::scion::topology::{ScionAs, ScionTopologyBuilder},
    runtime::builder::PocketScionRuntimeBuilder,
    state::PocketScionState,
};
use scion_stack::stack::ScionStackBuilder;
use sciparse::identifier::isd_asn::IsdAsn;
use snap_tokens::v0::dummy_snap_token;
use url::Url;

#[tokio::test]
#[timeout(10_000)]
async fn should_send_receive_with_topology() -> anyhow::Result<()> {
    scion_sdk_utils::rustls::select_ring_crypto_provider();
    let server_ia = IsdAsn::from_str("1-3")?;
    let client_ia = IsdAsn::from_str("2-3")?;

    const MESSAGE_LEN: usize = 64;

    let mut state = PocketScionState::new(Utc::now());

    //
    // Setup minimal topology
    let mut topo = ScionTopologyBuilder::new();
    topo.add_as(ScionAs::new_core("1-1".parse()?))?
        .add_as(ScionAs::new_core("1-2".parse()?))?
        .add_as(ScionAs::new("1-3".parse()?))?
        .add_as(ScionAs::new_core("2-1".parse()?))?
        .add_as(ScionAs::new("2-2".parse()?))?
        .add_as(ScionAs::new("2-3".parse()?))?
        .add_link("1-1#1 core 1-2#2".parse()?)?
        .add_link("1-2#1 down_to 1-3#1".parse()?)?
        .add_link("1-1#2 down_to 1-3#2".parse()?)?
        .add_link("1-1#3 core 2-1#1".parse()?)?
        .add_link("2-1#2 down_to 2-2#1".parse()?)?
        .add_link("2-2#2 down_to 2-3#1".parse()?)?;

    state.set_topology(topo.build()?);

    //
    // Setup snaps
    let server_snap_id = state.add_snap(server_ia)?;
    let client_snap_id = state.add_snap(client_ia)?;

    // Setup endhost APIs
    let _server_eh = state.add_endhost_api(vec![server_ia]);
    let _client_eh = state.add_endhost_api(vec![client_ia]);

    //
    // Start PocketScion
    let ps_rt = PocketScionRuntimeBuilder::new()
        .with_system_state(state)
        .start()
        .await
        .context("starting runtime")?;

    //
    // Get the Assigned addresses for the snaps
    let client_cp_addr = ps_rt
        .snap_control_addr(client_snap_id)
        .context("client snap not found")?;
    let client_cp_url: Url = format!("http://{client_cp_addr}").parse().unwrap();

    let server_cp_addr = ps_rt
        .snap_control_addr(server_snap_id)
        .context("server snap not found")?;
    let server_cp_url: Url = format!("http://{server_cp_addr}").parse().unwrap();

    //
    // Setup server
    let server_stack = ScionStackBuilder::new()
        .with_endhost_api(server_cp_url)
        .with_auth_token(dummy_snap_token())
        .build()
        .await?;

    let server_socket = server_stack.bind(None).await?;
    let server_addr = server_socket.local_addr();

    //
    // Setup client
    let client_stack = ScionStackBuilder::new()
        .with_endhost_api(client_cp_url)
        .with_auth_token(dummy_snap_token())
        .build()
        .await?;

    let client_socket = client_stack.bind(None).await?;

    //
    // Actual Test
    let mut recv_buf = [0u8; MESSAGE_LEN];

    let random_message = rand::random::<[u8; MESSAGE_LEN]>();
    client_socket
        .send_to(&random_message, server_addr)
        .await
        .context("error client sending essage")?;

    let (_, client_addr) = server_socket
        .recv_from(&mut recv_buf)
        .await
        .context("error server receiving message")?;

    assert_eq!(recv_buf, random_message, "Message mismatch");

    let random_message = rand::random::<[u8; MESSAGE_LEN]>();
    server_socket
        .send_to(&random_message, client_addr)
        .await
        .context("error server echoing message")?;

    client_socket
        .recv_from(&mut recv_buf)
        .await
        .context("error client receiving echo")?;

    assert_eq!(recv_buf, random_message, "Message mismatch");

    Ok(())
}