Example/polygon p2p (#6393)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

examples/polygon-p2p/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "polygon-p2p"
+version = "0.0.0"
+publish = false
+edition.workspace = true
+license.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+secp256k1.workspace = true
+tokio.workspace = true
+reth-network.workspace = true
+reth-primitives.workspace = true
+serde_json.workspace = true
+reth-tracing.workspace = true
+tokio-stream.workspace = true
+reth-provider = { workspace = true, features = ["test-utils"] }
+reth-discv4 = { workspace = true, features = ["test-utils"] }

examples/polygon-p2p/src/chain_cfg.rs

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+use reth_primitives::{
+    b256, BaseFeeParams, Chain, ChainSpec, ForkCondition, ForkTimestamps, Hardfork, Head,
+    NodeRecord, B256,
+};
+
+use std::{collections::BTreeMap, sync::Arc};
+
+const SHANGAI_BLOCK: u64 = 50523000;
+
+pub(crate) fn polygon_chain_spec() -> Arc<ChainSpec> {
+    const GENESIS: B256 = b256!("a9c28ce2141b56c474f1dc504bee9b01eb1bd7d1a507580d5519d4437a97de1b");
+
+    ChainSpec {
+        chain: Chain::from_id(137),
+        // <https://github.com/maticnetwork/bor/blob/d521b8e266b97efe9c8fdce8167e9dd77b04637d/builder/files/genesis-mainnet-v1.json>
+        genesis: serde_json::from_str(include_str!("./genesis.json")).expect("deserialize genesis"),
+        genesis_hash: Some(GENESIS),
+        fork_timestamps: ForkTimestamps::default().shanghai(1681338455),
+        paris_block_and_final_difficulty: None,
+        hardforks: BTreeMap::from([
+            (Hardfork::Petersburg, ForkCondition::Block(0)),
+            (Hardfork::Istanbul, ForkCondition::Block(3395000)),
+            (Hardfork::MuirGlacier, ForkCondition::Block(3395000)),
+            (Hardfork::Berlin, ForkCondition::Block(14750000)),
+            (Hardfork::London, ForkCondition::Block(23850000)),
+            (Hardfork::Shanghai, ForkCondition::Block(SHANGAI_BLOCK)),
+        ]),
+        deposit_contract: None,
+        base_fee_params: reth_primitives::BaseFeeParamsKind::Constant(BaseFeeParams::ethereum()),
+        snapshot_block_interval: 500_000,
+        prune_delete_limit: 0,
+    }
+    .into()
+}
+
+/// Polygon mainnet boot nodes <https://github.com/maticnetwork/bor/blob/master/params/bootnodes.go#L79>
+static BOOTNODES : [&str; 4] = [
+	"enode://b8f1cc9c5d4403703fbf377116469667d2b1823c0daf16b7250aa576bacf399e42c3930ccfcb02c5df6879565a2b8931335565f0e8d3f8e72385ecf4a4bf160a@3.36.224.80:30303",
+	"enode://8729e0c825f3d9cad382555f3e46dcff21af323e89025a0e6312df541f4a9e73abfa562d64906f5e59c51fe6f0501b3e61b07979606c56329c020ed739910759@54.194.245.5:30303",
+	"enode://76316d1cb93c8ed407d3332d595233401250d48f8fbb1d9c65bd18c0495eca1b43ec38ee0ea1c257c0abb7d1f25d649d359cdfe5a805842159cfe36c5f66b7e8@52.78.36.216:30303",
+	"enode://681ebac58d8dd2d8a6eef15329dfbad0ab960561524cf2dfde40ad646736fe5c244020f20b87e7c1520820bc625cfb487dd71d63a3a3bf0baea2dbb8ec7c79f1@34.240.245.39:30303",
+];
+
+pub(crate) fn head() -> Head {
+    Head { number: SHANGAI_BLOCK, ..Default::default() }
+}
+
+pub(crate) fn boot_nodes() -> Vec<NodeRecord> {
+    BOOTNODES[..].iter().map(|s| s.parse().unwrap()).collect()
+}

examples/polygon-p2p/src/main.rs

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+//! Example for how hook into the polygon p2p network
+//!
+//! Run with
+//!
+//! ```not_rust
+//! cargo run -p polygon-p2p
+//! ```
+//!
+//! This launch the regular reth node overriding the engine api payload builder with our custom.
+//!
+//! Credits to: <https://blog.merkle.io/blog/fastest-transaction-network-eth-polygon-bsc>
+use chain_cfg::{boot_nodes, head, polygon_chain_spec};
+use reth_discv4::Discv4ConfigBuilder;
+use reth_network::{
+    config::NetworkMode, NetworkConfig, NetworkEvent, NetworkEvents, NetworkManager,
+};
+use reth_tracing::{
+    tracing::info, tracing_subscriber::filter::LevelFilter, LayerInfo, LogFormat, RethTracer,
+    Tracer,
+};
+use secp256k1::{rand, SecretKey};
+use std::{
+    net::{Ipv4Addr, SocketAddr},
+    time::Duration,
+};
+use tokio_stream::StreamExt;
+pub mod chain_cfg;
+
+#[tokio::main]
+async fn main() {
+    // The ECDSA private key used to create our enode identifier.
+    let secret_key = SecretKey::new(&mut rand::thread_rng());
+
+    let _ = RethTracer::new()
+        .with_stdout(LayerInfo::new(
+            LogFormat::Terminal,
+            "info".to_string(),
+            LevelFilter::INFO.into(),
+            Some("always".to_string()),
+        ))
+        .init();
+
+    // The local address we want to bind to
+    let local_addr = SocketAddr::new(Ipv4Addr::UNSPECIFIED.into(), 30303);
+
+    // The network configuration
+    let net_cfg = NetworkConfig::builder(secret_key)
+        .chain_spec(polygon_chain_spec())
+        .set_head(head())
+        .network_mode(NetworkMode::Work)
+        .listener_addr(local_addr)
+        .build_with_noop_provider();
+
+    // Set Discv4 lookup interval to 1 second
+    let mut discv4_cfg = Discv4ConfigBuilder::default();
+    let interval = Duration::from_secs(1);
+    discv4_cfg.add_boot_nodes(boot_nodes()).lookup_interval(interval);
+    let net_cfg = net_cfg.set_discovery_v4(discv4_cfg.build());
+
+    let net_manager = NetworkManager::new(net_cfg).await.unwrap();
+
+    // The network handle is our entrypoint into the network.
+    let net_handle = net_manager.handle();
+    let mut events = net_handle.event_listener();
+
+    // NetworkManager is a long running task, let's spawn it
+    tokio::spawn(net_manager);
+    info!("Looking for Polygon peers...");
+
+    while let Some(evt) = events.next().await {
+        // For the sake of the example we only print the session established event
+        // with the chain specific details
+        if let NetworkEvent::SessionEstablished { status, client_version, .. } = evt {
+            let chain = status.chain;
+            info!(?chain, ?client_version, "Session established with a new peer.");
+        }
+        // More events here
+    }
+    // We will be disconnected from peers since we are not able to answer to network requests
+}