Add DSN client to subspace-gateway binary

crates/subspace-gateway/Cargo.toml

@@ -18,10 +18,17 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
 anyhow = "1.0.89"
+async-trait = "0.1.83"
 clap = { version = "4.5.18", features = ["derive"] }
 fdlimit = "0.3.0"
 futures = "0.3.31"
+hex = "0.4.3"
+jsonrpsee = { version = "0.24.5", features = ["server"] }
 mimalloc = "0.1.43"
+parking_lot = "0.12.2"
+subspace-core-primitives = { version = "0.1.0", path = "../subspace-core-primitives" }
+subspace-networking = { version = "0.1.0", path = "../subspace-networking" }
+subspace-rpc-primitives = { version = "0.1.0", path = "../subspace-rpc-primitives" }
 supports-color = "3.0.1"
 thiserror = "1.0.64"
 tokio = { version = "1.40.0", features = ["macros"] }

crates/subspace-gateway/README.md

@@ -1,6 +1,6 @@
 # Subspace Gateway
 
-Data Gateway implementation for Subspace Network Blockchain using [Substrate](https://docs.substrate.io/) framework.
+Data Gateway implementation for the Subspace Network Blockchain.
 
 ## Getting Started
 

crates/subspace-gateway/src/commands/run.rs

@@ -1,6 +1,9 @@
 //! Gateway run command.
 //! This is the primary command for the gateway.
 
+mod dsn;
+
+use crate::commands::run::dsn::NetworkArgs;
 use crate::commands::shutdown_signal;
 use clap::Parser;
 use futures::{select, FutureExt};
@@ -19,8 +22,14 @@ pub struct RunOptions {
 #[derive(Debug, Parser)]
 pub(super) struct GatewayOptions {
     /// Enable development mode.
-    #[arg(long)]
+    ///
+    /// Implies following flags (unless customized):
+    /// * `--allow-private-ips`
+    #[arg(long, verbatim_doc_comment)]
     dev: bool,
+
+    #[clap(flatten)]
+    dsn_options: NetworkArgs,
 }
 
 /// Default run command for gateway
@@ -29,14 +38,28 @@ pub async fn run(run_options: RunOptions) -> anyhow::Result<()> {
     let signal = shutdown_signal();
 
     let RunOptions {
-        gateway: GatewayOptions { dev: _ },
+        gateway: GatewayOptions {
+            dev,
+            mut dsn_options,
+        },
     } = run_options;
 
+    // Development mode handling is limited to this section
+    {
+        if dev {
+            dsn_options.allow_private_ips = true;
+        }
+    }
+
     info!("Subspace Gateway");
     info!("✌️  version {}", env!("CARGO_PKG_VERSION"));
     info!("❤️  by {}", env!("CARGO_PKG_AUTHORS"));
 
-    let dsn_fut = future::pending::<()>();
+    // TODO: move this service code into its own function, in a new library part of this crate
+    #[expect(unused_variables, reason = "implementation is incomplete")]
+    let (dsn_node, mut dsn_node_runner, node_client) = dsn::configure_network(dsn_options).await?;
+    let dsn_fut = dsn_node_runner.run();
+
     let rpc_fut = future::pending::<()>();
 
     // This defines order in which things are dropped

crates/subspace-gateway/src/commands/run/dsn.rs

@@ -0,0 +1,99 @@
+//! DSN config and implementation for the gateway.
+
+use crate::node_client::{NodeClient, RpcNodeClient};
+use anyhow::anyhow;
+use clap::{Parser, ValueHint};
+use subspace_networking::libp2p::kad::Mode;
+use subspace_networking::libp2p::Multiaddr;
+use subspace_networking::{construct, Config, KademliaMode, Node, NodeRunner};
+use tracing::{debug, info};
+
+/// Configuration for network stack
+#[derive(Debug, Parser)]
+pub(crate) struct NetworkArgs {
+    /// WebSocket RPC URL of the Subspace node to connect to.
+    ///
+    /// This node provides the DSN protocol version, default bootstrap nodes, and piece validation
+    /// metadata.
+    #[arg(long, value_hint = ValueHint::Url, default_value = "ws://127.0.0.1:9944")]
+    node_rpc_url: String,
+
+    /// Multiaddrs of DSN bootstrap nodes to connect to on startup, multiple are supported.
+    ///
+    /// The default bootstrap nodes are fetched from the node RPC connection.
+    #[arg(long)]
+    pub(crate) dsn_bootstrap_nodes: Vec<Multiaddr>,
+
+    /// Multiaddrs of DSN reserved nodes to maintain a connection to, multiple are supported.
+    #[arg(long)]
+    dsn_reserved_peers: Vec<Multiaddr>,
+
+    /// Enable non-global (private, shared, loopback..) addresses in the Kademlia DHT.
+    /// By default these addresses are excluded from the DHT.
+    #[arg(long, default_value_t = false)]
+    pub(crate) allow_private_ips: bool,
+
+    /// Maximum established outgoing swarm connection limit.
+    #[arg(long, default_value_t = 100)]
+    pub(crate) out_connections: u32,
+
+    /// Maximum pending outgoing swarm connection limit.
+    #[arg(long, default_value_t = 100)]
+    pub(crate) pending_out_connections: u32,
+}
+
+/// Create a DSN network client with the supplied configuration.
+// TODO:
+// - move this DSN code into a new library part of this crate
+// - change NetworkArgs to a struct that's independent of clap
+pub async fn configure_network(
+    NetworkArgs {
+        node_rpc_url,
+        mut dsn_bootstrap_nodes,
+        dsn_reserved_peers,
+        allow_private_ips,
+        out_connections,
+        pending_out_connections,
+    }: NetworkArgs,
+) -> anyhow::Result<(Node, NodeRunner<()>, RpcNodeClient)> {
+    // TODO:
+    // - store keypair on disk and allow CLI override
+    // - cache known peers on disk
+    // - prometheus telemetry
+    let default_config = Config::<()>::default();
+
+    info!(url = %node_rpc_url, "Connecting to node RPC");
+    let node_client = RpcNodeClient::new(&node_rpc_url)
+        .await
+        .map_err(|error| anyhow!("Failed to connect to node RPC: {error}"))?;
+
+    // The gateway only needs the first part of the farmer info.
+    let farmer_app_info = node_client
+        .farmer_app_info()
+        .await
+        .map_err(|error| anyhow!("Failed to get farmer app info: {error}"))?;
+
+    // Fall back to the node's bootstrap nodes.
+    if dsn_bootstrap_nodes.is_empty() {
+        debug!(dsn_bootstrap_nodes = ?farmer_app_info.dsn_bootstrap_nodes, "Setting DSN bootstrap nodes...");
+        dsn_bootstrap_nodes.clone_from(&farmer_app_info.dsn_bootstrap_nodes);
+    }
+
+    let dsn_protocol_version = hex::encode(farmer_app_info.genesis_hash);
+    debug!(?dsn_protocol_version, "Setting DSN protocol version...");
+
+    let config = Config {
+        protocol_version: dsn_protocol_version,
+        bootstrap_addresses: dsn_bootstrap_nodes,
+        reserved_peers: dsn_reserved_peers,
+        allow_non_global_addresses_in_dht: allow_private_ips,
+        max_established_outgoing_connections: out_connections,
+        max_pending_outgoing_connections: pending_out_connections,
+        kademlia_mode: KademliaMode::Static(Mode::Client),
+        ..default_config
+    };
+
+    let (node, node_runner) = construct(config)?;
+
+    Ok((node, node_runner, node_client))
+}

crates/subspace-gateway/src/main.rs

@@ -7,6 +7,7 @@
 )]
 
 mod commands;
+mod node_client;
 
 use crate::commands::{init_logger, raise_fd_limit, Command};
 use clap::Parser;

crates/subspace-gateway/src/node_client.rs

@@ -0,0 +1,61 @@
+//! Node client implementation that connects to node via RPC (WebSockets)
+
+use async_trait::async_trait;
+use jsonrpsee::core::client::{ClientT, Error as JsonError};
+use jsonrpsee::rpc_params;
+use jsonrpsee::ws_client::{WsClient, WsClientBuilder};
+use std::fmt;
+use std::sync::Arc;
+use subspace_core_primitives::segments::{SegmentHeader, SegmentIndex};
+use subspace_rpc_primitives::FarmerAppInfo;
+
+/// Node client implementation that connects to node via RPC (WebSockets).
+///
+/// This implementation is supposed to be used on local network and not via public Internet due to
+/// sensitive contents.
+#[derive(Debug, Clone)]
+pub struct RpcNodeClient {
+    client: Arc<WsClient>,
+}
+
+impl RpcNodeClient {
+    /// Create a new instance of [`NodeClient`].
+    pub async fn new(url: &str) -> Result<Self, JsonError> {
+        let client = Arc::new(WsClientBuilder::default().build(url).await?);
+        Ok(Self { client })
+    }
+}
+
+/// Abstraction of the Node Client
+#[async_trait]
+pub trait NodeClient: fmt::Debug + Send + Sync + 'static {
+    /// Get farmer app info
+    async fn farmer_app_info(&self) -> anyhow::Result<FarmerAppInfo>;
+
+    /// Get segment headers for the segments
+    #[expect(dead_code, reason = "implementation is incomplete")]
+    async fn segment_headers(
+        &self,
+        segment_indices: Vec<SegmentIndex>,
+    ) -> anyhow::Result<Vec<Option<SegmentHeader>>>;
+}
+
+#[async_trait]
+impl NodeClient for RpcNodeClient {
+    async fn farmer_app_info(&self) -> anyhow::Result<FarmerAppInfo> {
+        Ok(self
+            .client
+            .request("subspace_getFarmerAppInfo", rpc_params![])
+            .await?)
+    }
+
+    async fn segment_headers(
+        &self,
+        segment_indices: Vec<SegmentIndex>,
+    ) -> anyhow::Result<Vec<Option<SegmentHeader>>> {
+        Ok(self
+            .client
+            .request("subspace_segmentHeaders", rpc_params![&segment_indices])
+            .await?)
+    }
+}