reth_eth_wire/hello.rs
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use crate::{Capability, EthVersion, ProtocolVersion};
use alloy_rlp::{RlpDecodable, RlpEncodable};
use reth_codecs::add_arbitrary_tests;
use reth_network_peers::PeerId;
use reth_primitives::constants::RETH_CLIENT_VERSION;
/// The default tcp port for p2p.
///
/// Note: this is the same as discovery port: `DEFAULT_DISCOVERY_PORT`
pub(crate) const DEFAULT_TCP_PORT: u16 = 30303;
use crate::protocol::Protocol;
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
/// This is a superset of [`HelloMessage`] that provides additional protocol [Protocol] information
/// about the number of messages used by each capability in order to do proper message ID
/// multiplexing.
///
/// This type is required for the `p2p` handshake because the [`HelloMessage`] does not share the
/// number of messages used by each capability.
///
/// To get the encodable [`HelloMessage`] without the additional protocol information, use the
/// [`HelloMessageWithProtocols::message`].
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub struct HelloMessageWithProtocols {
/// The version of the `p2p` protocol.
pub protocol_version: ProtocolVersion,
/// Specifies the client software identity, as a human-readable string (e.g.
/// "Ethereum(++)/1.0.0").
pub client_version: String,
/// The list of supported capabilities and their versions.
pub protocols: Vec<Protocol>,
/// The port that the client is listening on, zero indicates the client is not listening.
///
/// By default this is `30303` which is the same as the default discovery port.
pub port: u16,
/// The secp256k1 public key corresponding to the node's private key.
pub id: PeerId,
}
impl HelloMessageWithProtocols {
/// Starts a new `HelloMessageProtocolsBuilder`
///
/// ```
/// use reth_eth_wire::HelloMessageWithProtocols;
/// use reth_network_peers::pk2id;
/// use secp256k1::{SecretKey, SECP256K1};
/// let secret_key = SecretKey::new(&mut rand::thread_rng());
/// let id = pk2id(&secret_key.public_key(SECP256K1));
/// let status = HelloMessageWithProtocols::builder(id).build();
/// ```
pub const fn builder(id: PeerId) -> HelloMessageBuilder {
HelloMessageBuilder::new(id)
}
/// Returns the raw [`HelloMessage`] without the additional protocol information.
#[inline]
pub fn message(&self) -> HelloMessage {
HelloMessage {
protocol_version: self.protocol_version,
client_version: self.client_version.clone(),
capabilities: self.protocols.iter().map(|p| p.cap.clone()).collect(),
port: self.port,
id: self.id,
}
}
/// Converts the type into a [`HelloMessage`] without the additional protocol information.
pub fn into_message(self) -> HelloMessage {
HelloMessage {
protocol_version: self.protocol_version,
client_version: self.client_version,
capabilities: self.protocols.into_iter().map(|p| p.cap).collect(),
port: self.port,
id: self.id,
}
}
/// Returns true if the set of protocols contains the given protocol.
#[inline]
pub fn contains_protocol(&self, protocol: &Protocol) -> bool {
self.protocols.iter().any(|p| p.cap == protocol.cap)
}
/// Adds a new protocol to the set.
///
/// Returns an error if the protocol already exists.
#[inline]
pub fn try_add_protocol(&mut self, protocol: Protocol) -> Result<(), Protocol> {
if self.contains_protocol(&protocol) {
Err(protocol)
} else {
self.protocols.push(protocol);
Ok(())
}
}
}
// TODO: determine if we should allow for the extra fields at the end like EIP-706 suggests
/// Raw rlpx protocol message used in the `p2p` handshake, containing information about the
/// supported RLPx protocol version and capabilities.
///
/// See also <https://github.com/ethereum/devp2p/blob/master/rlpx.md#hello-0x00>
#[derive(Clone, Debug, PartialEq, Eq, RlpEncodable, RlpDecodable)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(any(test, feature = "arbitrary"), derive(arbitrary::Arbitrary))]
#[add_arbitrary_tests(rlp)]
pub struct HelloMessage {
/// The version of the `p2p` protocol.
pub protocol_version: ProtocolVersion,
/// Specifies the client software identity, as a human-readable string (e.g.
/// "Ethereum(++)/1.0.0").
pub client_version: String,
/// The list of supported capabilities and their versions.
pub capabilities: Vec<Capability>,
/// The port that the client is listening on, zero indicates the client is not listening.
pub port: u16,
/// The secp256k1 public key corresponding to the node's private key.
pub id: PeerId,
}
// === impl HelloMessage ===
impl HelloMessage {
/// Starts a new `HelloMessageBuilder`
///
/// ```
/// use reth_eth_wire::HelloMessage;
/// use reth_network_peers::pk2id;
/// use secp256k1::{SecretKey, SECP256K1};
/// let secret_key = SecretKey::new(&mut rand::thread_rng());
/// let id = pk2id(&secret_key.public_key(SECP256K1));
/// let status = HelloMessage::builder(id).build();
/// ```
pub const fn builder(id: PeerId) -> HelloMessageBuilder {
HelloMessageBuilder::new(id)
}
}
/// Builder for [`HelloMessageWithProtocols`]
#[derive(Debug)]
pub struct HelloMessageBuilder {
/// The version of the `p2p` protocol.
pub protocol_version: Option<ProtocolVersion>,
/// Specifies the client software identity, as a human-readable string (e.g.
/// "Ethereum(++)/1.0.0").
pub client_version: Option<String>,
/// The list of supported protocols.
pub protocols: Option<Vec<Protocol>>,
/// The port that the client is listening on, zero indicates the client is not listening.
pub port: Option<u16>,
/// The secp256k1 public key corresponding to the node's private key.
pub id: PeerId,
}
// === impl HelloMessageBuilder ===
impl HelloMessageBuilder {
/// Create a new builder to configure a [`HelloMessage`]
pub const fn new(id: PeerId) -> Self {
Self { protocol_version: None, client_version: None, protocols: None, port: None, id }
}
/// Sets the port the client is listening on
pub const fn port(mut self, port: u16) -> Self {
self.port = Some(port);
self
}
/// Adds a new protocol to use.
pub fn protocol(mut self, protocols: impl Into<Protocol>) -> Self {
self.protocols.get_or_insert_with(Vec::new).push(protocols.into());
self
}
/// Sets protocols to use.
pub fn protocols(mut self, protocols: impl IntoIterator<Item = Protocol>) -> Self {
self.protocols.get_or_insert_with(Vec::new).extend(protocols);
self
}
/// Sets client version.
pub fn client_version(mut self, client_version: impl Into<String>) -> Self {
self.client_version = Some(client_version.into());
self
}
/// Sets protocol version.
pub const fn protocol_version(mut self, protocol_version: ProtocolVersion) -> Self {
self.protocol_version = Some(protocol_version);
self
}
/// Consumes the type and returns the configured [`HelloMessage`]
///
/// Unset fields will be set to their default values:
/// - `protocol_version`: [`ProtocolVersion::V5`]
/// - `client_version`: [`RETH_CLIENT_VERSION`]
/// - `capabilities`: All [`EthVersion`]
pub fn build(self) -> HelloMessageWithProtocols {
let Self { protocol_version, client_version, protocols, port, id } = self;
HelloMessageWithProtocols {
protocol_version: protocol_version.unwrap_or_default(),
client_version: client_version.unwrap_or_else(|| RETH_CLIENT_VERSION.to_string()),
protocols: protocols.unwrap_or_else(|| {
vec![EthVersion::Eth68.into(), EthVersion::Eth67.into(), EthVersion::Eth66.into()]
}),
port: port.unwrap_or(DEFAULT_TCP_PORT),
id,
}
}
}
#[cfg(test)]
mod tests {
use crate::{p2pstream::P2PMessage, Capability, EthVersion, HelloMessage, ProtocolVersion};
use alloy_rlp::{Decodable, Encodable, EMPTY_STRING_CODE};
use reth_network_peers::pk2id;
use secp256k1::{SecretKey, SECP256K1};
#[test]
fn test_hello_encoding_round_trip() {
let secret_key = SecretKey::new(&mut rand::thread_rng());
let id = pk2id(&secret_key.public_key(SECP256K1));
let hello = P2PMessage::Hello(HelloMessage {
protocol_version: ProtocolVersion::V5,
client_version: "reth/0.1.0".to_string(),
capabilities: vec![Capability::new_static("eth", EthVersion::Eth67 as usize)],
port: 30303,
id,
});
let mut hello_encoded = Vec::new();
hello.encode(&mut hello_encoded);
let hello_decoded = P2PMessage::decode(&mut &hello_encoded[..]).unwrap();
assert_eq!(hello, hello_decoded);
}
#[test]
fn hello_encoding_length() {
let secret_key = SecretKey::new(&mut rand::thread_rng());
let id = pk2id(&secret_key.public_key(SECP256K1));
let hello = P2PMessage::Hello(HelloMessage {
protocol_version: ProtocolVersion::V5,
client_version: "reth/0.1.0".to_string(),
capabilities: vec![Capability::new_static("eth", EthVersion::Eth67 as usize)],
port: 30303,
id,
});
let mut hello_encoded = Vec::new();
hello.encode(&mut hello_encoded);
assert_eq!(hello_encoded.len(), hello.length());
}
#[test]
fn hello_message_id_prefix() {
// ensure that the hello message id is prefixed
let secret_key = SecretKey::new(&mut rand::thread_rng());
let id = pk2id(&secret_key.public_key(SECP256K1));
let hello = P2PMessage::Hello(HelloMessage {
protocol_version: ProtocolVersion::V5,
client_version: "reth/0.1.0".to_string(),
capabilities: vec![Capability::new_static("eth", EthVersion::Eth67 as usize)],
port: 30303,
id,
});
let mut hello_encoded = Vec::new();
hello.encode(&mut hello_encoded);
// zero is encoded as 0x80, the empty string code in RLP
assert_eq!(hello_encoded[0], EMPTY_STRING_CODE);
}
}