chore(net): move reth_network::BlockDownloaderProvider to reth-network-api (#10003)

crates/net/network-api/Cargo.toml

@@ -17,6 +17,7 @@ reth-eth-wire.workspace = true
 alloy-rpc-types-admin.workspace = true
 reth-network-peers.workspace = true
 reth-network-types.workspace = true
+reth-network-p2p.workspace = true
 
 # ethereum
 alloy-primitives.workspace = true
@@ -24,6 +25,9 @@ alloy-primitives.workspace = true
 # eth
 enr = { workspace = true, default-features = false, features = ["rust-secp256k1"] }
 
+# async
+futures.workspace = true
+
 # misc
 thiserror.workspace = true
 serde = { workspace = true, features = ["derive"], optional = true }

crates/net/network-api/src/downloaders.rs

@@ -0,0 +1,16 @@
+//! API related to syncing blocks.
+
+use futures::Future;
+use reth_network_p2p::BlockClient;
+use tokio::sync::oneshot;
+
+/// Provides client for downloading blocks.
+#[auto_impl::auto_impl(&, Arc)]
+pub trait BlockDownloaderProvider {
+    /// Returns a new [`BlockClient`], used for fetching blocks from peers.
+    ///
+    /// The client is the entrypoint for sending block requests to the network.
+    fn fetch_client(
+        &self,
+    ) -> impl Future<Output = Result<impl BlockClient + 'static, oneshot::error::RecvError>> + Send;
+}

crates/net/network-api/src/lib.rs

@@ -13,15 +13,19 @@
 )]
 #![cfg_attr(docsrs, feature(doc_cfg, doc_auto_cfg))]
 
+pub mod downloaders;
 /// Network Error
 pub mod error;
 /// Implementation of network traits for that does nothing.
 pub mod noop;
 
 pub use alloy_rpc_types_admin::EthProtocolInfo;
-pub use error::NetworkError;
+pub use reth_network_p2p::BlockClient;
 pub use reth_network_types::{PeerKind, PeersHandle, Reputation, ReputationChangeKind};
 
+pub use downloaders::BlockDownloaderProvider;
+pub use error::NetworkError;
+
 use std::{future::Future, net::SocketAddr, sync::Arc, time::Instant};
 
 use reth_eth_wire::{capability::Capabilities, DisconnectReason, EthVersion, Status};