From a6016c7eeb11fc8aeaa1a3b160b970b15362695d Mon Sep 17 00:00:00 2001
From: hozan23 <hozan23@karyontech.net>
Date: Sun, 19 May 2024 22:20:03 +0200
Subject: add tokio examples to p2p, jsonrpc, and net crates

---
 p2p/examples/tokio-example/src/main.rs | 80 ++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 p2p/examples/tokio-example/src/main.rs

(limited to 'p2p/examples/tokio-example/src/main.rs')

diff --git a/p2p/examples/tokio-example/src/main.rs b/p2p/examples/tokio-example/src/main.rs
new file mode 100644
index 0000000..6a81ac6
--- /dev/null
+++ b/p2p/examples/tokio-example/src/main.rs
@@ -0,0 +1,80 @@
+use std::sync::Arc;
+
+use clap::Parser;
+
+use karyon_p2p::{
+    endpoint::{Endpoint, Port},
+    keypair::{KeyPair, KeyPairType},
+    Backend, Config,
+};
+
+/// Returns an estimate of the default amount of parallelism a program should use.
+/// see `std::thread::available_parallelism`
+pub fn available_parallelism() -> usize {
+    std::thread::available_parallelism()
+        .map(std::num::NonZeroUsize::get)
+        .unwrap_or(1)
+}
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+    /// Optional list of bootstrap peers to start the seeding process.
+    #[arg(short)]
+    bootstrap_peers: Vec<Endpoint>,
+
+    /// Optional list of peer endpoints for manual connections.
+    #[arg(short)]
+    peer_endpoints: Vec<Endpoint>,
+
+    /// Optional endpoint for accepting incoming connections.
+    #[arg(short)]
+    listen_endpoint: Option<Endpoint>,
+
+    /// Optional TCP/UDP port for the discovery service.
+    #[arg(short)]
+    discovery_port: Option<Port>,
+}
+
+fn main() {
+    env_logger::init();
+    let cli = Cli::parse();
+
+    let key_pair = KeyPair::generate(&KeyPairType::Ed25519);
+
+    // Create the configuration for the backend.
+    let config = Config {
+        listen_endpoint: cli.listen_endpoint,
+        peer_endpoints: cli.peer_endpoints,
+        bootstrap_peers: cli.bootstrap_peers,
+        discovery_port: cli.discovery_port.unwrap_or(0),
+        ..Default::default()
+    };
+
+    // Create a new tokio runtime
+    let rt = Arc::new(
+        tokio::runtime::Builder::new_multi_thread()
+            .worker_threads(available_parallelism())
+            .enable_all()
+            .build()
+            .unwrap(),
+    );
+
+    // Create a new Backend
+    let backend = Backend::new(&key_pair, config, rt.clone().into());
+
+    let (ctrlc_s, ctrlc_r) = async_channel::unbounded();
+    let handle = move || ctrlc_s.try_send(()).unwrap();
+    ctrlc::set_handler(handle).unwrap();
+
+    rt.block_on(async {
+        // Run the backend
+        backend.run().await.unwrap();
+
+        // Wait for ctrlc signal
+        ctrlc_r.recv().await.unwrap();
+
+        // Shutdown the backend
+        backend.shutdown().await;
+    });
+}
-- 
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