reth_network_p2p/full_block.rs
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use super::headers::client::HeadersRequest;
use crate::{
bodies::client::{BodiesClient, SingleBodyRequest},
error::PeerRequestResult,
headers::client::{HeadersClient, SingleHeaderRequest},
BlockClient,
};
use alloy_consensus::BlockHeader;
use alloy_primitives::{Sealable, B256};
use reth_consensus::Consensus;
use reth_eth_wire_types::HeadersDirection;
use reth_network_peers::WithPeerId;
use reth_primitives::{SealedBlock, SealedHeader};
use std::{
cmp::Reverse,
collections::{HashMap, VecDeque},
fmt::Debug,
future::Future,
hash::Hash,
pin::Pin,
sync::Arc,
task::{ready, Context, Poll},
};
use tracing::debug;
/// A Client that can fetch full blocks from the network.
#[derive(Debug, Clone)]
pub struct FullBlockClient<Client>
where
Client: BlockClient,
{
client: Client,
consensus: Arc<dyn Consensus<Client::Header, Client::Body>>,
}
impl<Client> FullBlockClient<Client>
where
Client: BlockClient,
{
/// Creates a new instance of `FullBlockClient`.
pub fn new(
client: Client,
consensus: Arc<dyn Consensus<Client::Header, Client::Body>>,
) -> Self {
Self { client, consensus }
}
/// Returns a client with Test consensus
#[cfg(any(test, feature = "test-utils"))]
pub fn test_client(client: Client) -> Self {
Self::new(client, Arc::new(reth_consensus::test_utils::TestConsensus::default()))
}
}
impl<Client> FullBlockClient<Client>
where
Client: BlockClient,
{
/// Returns a future that fetches the [`SealedBlock`] for the given hash.
///
/// Note: this future is cancel safe
///
/// Caution: This does no validation of body (transactions) response but guarantees that the
/// [`SealedHeader`] matches the requested hash.
pub fn get_full_block(&self, hash: B256) -> FetchFullBlockFuture<Client> {
let client = self.client.clone();
FetchFullBlockFuture {
hash,
consensus: self.consensus.clone(),
request: FullBlockRequest {
header: Some(client.get_header(hash.into())),
body: Some(client.get_block_body(hash)),
},
client,
header: None,
body: None,
}
}
/// Returns a future that fetches [`SealedBlock`]s for the given hash and count.
///
/// Note: this future is cancel safe
///
/// Caution: This does no validation of body (transactions) responses but guarantees that
/// the starting [`SealedHeader`] matches the requested hash, and that the number of headers and
/// bodies received matches the requested limit.
///
/// The returned future yields bodies in falling order, i.e. with descending block numbers.
pub fn get_full_block_range(
&self,
hash: B256,
count: u64,
) -> FetchFullBlockRangeFuture<Client> {
let client = self.client.clone();
FetchFullBlockRangeFuture {
start_hash: hash,
count,
request: FullBlockRangeRequest {
headers: Some(client.get_headers(HeadersRequest::falling(hash.into(), count))),
bodies: None,
},
client,
headers: None,
pending_headers: VecDeque::new(),
bodies: HashMap::default(),
consensus: Arc::clone(&self.consensus),
}
}
}
/// A future that downloads a full block from the network.
///
/// This will attempt to fetch both the header and body for the given block hash at the same time.
/// When both requests succeed, the future will yield the full block.
#[must_use = "futures do nothing unless polled"]
pub struct FetchFullBlockFuture<Client>
where
Client: BlockClient,
{
client: Client,
consensus: Arc<dyn Consensus<Client::Header, Client::Body>>,
hash: B256,
request: FullBlockRequest<Client>,
header: Option<SealedHeader<Client::Header>>,
body: Option<BodyResponse<Client::Body>>,
}
impl<Client> FetchFullBlockFuture<Client>
where
Client: BlockClient<Header: BlockHeader>,
{
/// Returns the hash of the block being requested.
pub const fn hash(&self) -> &B256 {
&self.hash
}
/// If the header request is already complete, this returns the block number
pub fn block_number(&self) -> Option<u64> {
self.header.as_ref().map(|h| h.number())
}
/// Returns the [`SealedBlock`] if the request is complete and valid.
fn take_block(&mut self) -> Option<SealedBlock<Client::Header, Client::Body>> {
if self.header.is_none() || self.body.is_none() {
return None
}
let header = self.header.take().unwrap();
let resp = self.body.take().unwrap();
match resp {
BodyResponse::Validated(body) => Some(SealedBlock::new(header, body)),
BodyResponse::PendingValidation(resp) => {
// ensure the block is valid, else retry
if let Err(err) = self.consensus.validate_body_against_header(resp.data(), &header)
{
debug!(target: "downloaders", %err, hash=?header.hash(), "Received wrong body");
self.client.report_bad_message(resp.peer_id());
self.header = Some(header);
self.request.body = Some(self.client.get_block_body(self.hash));
return None
}
Some(SealedBlock::new(header, resp.into_data()))
}
}
}
fn on_block_response(&mut self, resp: WithPeerId<Client::Body>) {
if let Some(ref header) = self.header {
if let Err(err) = self.consensus.validate_body_against_header(resp.data(), header) {
debug!(target: "downloaders", %err, hash=?header.hash(), "Received wrong body");
self.client.report_bad_message(resp.peer_id());
return
}
self.body = Some(BodyResponse::Validated(resp.into_data()));
return
}
self.body = Some(BodyResponse::PendingValidation(resp));
}
}
impl<Client> Future for FetchFullBlockFuture<Client>
where
Client: BlockClient<Header: BlockHeader + Sealable> + 'static,
{
type Output = SealedBlock<Client::Header, Client::Body>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let this = self.get_mut();
// preemptive yield point
let mut budget = 4;
loop {
match ready!(this.request.poll(cx)) {
ResponseResult::Header(res) => {
match res {
Ok(maybe_header) => {
let (peer, maybe_header) =
maybe_header.map(|h| h.map(SealedHeader::seal)).split();
if let Some(header) = maybe_header {
if header.hash() == this.hash {
this.header = Some(header);
} else {
debug!(target: "downloaders", expected=?this.hash, received=?header.hash(), "Received wrong header");
// received a different header than requested
this.client.report_bad_message(peer)
}
}
}
Err(err) => {
debug!(target: "downloaders", %err, ?this.hash, "Header download failed");
}
}
if this.header.is_none() {
// received bad response
this.request.header = Some(this.client.get_header(this.hash.into()));
}
}
ResponseResult::Body(res) => {
match res {
Ok(maybe_body) => {
if let Some(body) = maybe_body.transpose() {
this.on_block_response(body);
}
}
Err(err) => {
debug!(target: "downloaders", %err, ?this.hash, "Body download failed");
}
}
if this.body.is_none() {
// received bad response
this.request.body = Some(this.client.get_block_body(this.hash));
}
}
}
if let Some(res) = this.take_block() {
return Poll::Ready(res)
}
// ensure we still have enough budget for another iteration
budget -= 1;
if budget == 0 {
// make sure we're woken up again
cx.waker().wake_by_ref();
return Poll::Pending
}
}
}
}
impl<Client> Debug for FetchFullBlockFuture<Client>
where
Client: BlockClient<Header: Debug, Body: Debug>,
{
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("FetchFullBlockFuture")
.field("hash", &self.hash)
.field("header", &self.header)
.field("body", &self.body)
.finish()
}
}
struct FullBlockRequest<Client>
where
Client: BlockClient,
{
header: Option<SingleHeaderRequest<<Client as HeadersClient>::Output>>,
body: Option<SingleBodyRequest<<Client as BodiesClient>::Output>>,
}
impl<Client> FullBlockRequest<Client>
where
Client: BlockClient,
{
fn poll(&mut self, cx: &mut Context<'_>) -> Poll<ResponseResult<Client::Header, Client::Body>> {
if let Some(fut) = Pin::new(&mut self.header).as_pin_mut() {
if let Poll::Ready(res) = fut.poll(cx) {
self.header = None;
return Poll::Ready(ResponseResult::Header(res))
}
}
if let Some(fut) = Pin::new(&mut self.body).as_pin_mut() {
if let Poll::Ready(res) = fut.poll(cx) {
self.body = None;
return Poll::Ready(ResponseResult::Body(res))
}
}
Poll::Pending
}
}
/// The result of a request for a single header or body. This is yielded by the `FullBlockRequest`
/// future.
enum ResponseResult<H, B> {
Header(PeerRequestResult<Option<H>>),
Body(PeerRequestResult<Option<B>>),
}
/// The response of a body request.
#[derive(Debug)]
enum BodyResponse<B> {
/// Already validated against transaction root of header
Validated(B),
/// Still needs to be validated against header
PendingValidation(WithPeerId<B>),
}
/// A future that downloads a range of full blocks from the network.
///
/// This first fetches the headers for the given range using the inner `Client`. Once the request
/// is complete, it will fetch the bodies for the headers it received.
///
/// Once the bodies request completes, the [`SealedBlock`]s will be assembled and the future will
/// yield the full block range.
///
/// The full block range will be returned with falling block numbers, i.e. in descending order.
///
/// NOTE: this assumes that bodies responses are returned by the client in the same order as the
/// hash array used to request them.
#[must_use = "futures do nothing unless polled"]
#[allow(missing_debug_implementations)]
pub struct FetchFullBlockRangeFuture<Client>
where
Client: BlockClient,
{
/// The client used to fetch headers and bodies.
client: Client,
/// The consensus instance used to validate the blocks.
consensus: Arc<dyn Consensus<Client::Header, Client::Body>>,
/// The block hash to start fetching from (inclusive).
start_hash: B256,
/// How many blocks to fetch: `len([start_hash, ..]) == count`
count: u64,
/// Requests for headers and bodies that are in progress.
request: FullBlockRangeRequest<Client>,
/// Fetched headers.
headers: Option<Vec<SealedHeader<Client::Header>>>,
/// The next headers to request bodies for. This is drained as responses are received.
pending_headers: VecDeque<SealedHeader<Client::Header>>,
/// The bodies that have been received so far.
bodies: HashMap<SealedHeader<Client::Header>, BodyResponse<Client::Body>>,
}
impl<Client> FetchFullBlockRangeFuture<Client>
where
Client: BlockClient<Header: Debug + BlockHeader + Sealable + Clone + Hash + Eq>,
{
/// Returns the block hashes for the given range, if they are available.
pub fn range_block_hashes(&self) -> Option<Vec<B256>> {
self.headers.as_ref().map(|h| h.iter().map(|h| h.hash()).collect())
}
/// Returns whether or not the bodies map is fully populated with requested headers and bodies.
fn is_bodies_complete(&self) -> bool {
self.bodies.len() == self.count as usize
}
/// Inserts a block body, matching it with the `next_header`.
///
/// Note: this assumes the response matches the next header in the queue.
fn insert_body(&mut self, body_response: BodyResponse<Client::Body>) {
if let Some(header) = self.pending_headers.pop_front() {
self.bodies.insert(header, body_response);
}
}
/// Inserts multiple block bodies.
fn insert_bodies(&mut self, bodies: impl IntoIterator<Item = BodyResponse<Client::Body>>) {
for body in bodies {
self.insert_body(body);
}
}
/// Returns the remaining hashes for the bodies request, based on the headers that still exist
/// in the `root_map`.
fn remaining_bodies_hashes(&self) -> Vec<B256> {
self.pending_headers.iter().map(|h| h.hash()).collect()
}
/// Returns the [`SealedBlock`]s if the request is complete and valid.
///
/// The request is complete if the number of blocks requested is equal to the number of blocks
/// received. The request is valid if the returned bodies match the roots in the headers.
///
/// These are returned in falling order starting with the requested `hash`, i.e. with
/// descending block numbers.
fn take_blocks(&mut self) -> Option<Vec<SealedBlock<Client::Header, Client::Body>>> {
if !self.is_bodies_complete() {
// not done with bodies yet
return None
}
let headers = self.headers.take()?;
let mut needs_retry = false;
let mut valid_responses = Vec::new();
for header in &headers {
if let Some(body_resp) = self.bodies.remove(header) {
// validate body w.r.t. the hashes in the header, only inserting into the response
let body = match body_resp {
BodyResponse::Validated(body) => body,
BodyResponse::PendingValidation(resp) => {
// ensure the block is valid, else retry
if let Err(err) =
self.consensus.validate_body_against_header(resp.data(), header)
{
debug!(target: "downloaders", %err, hash=?header.hash(), "Received wrong body in range response");
self.client.report_bad_message(resp.peer_id());
// get body that doesn't match, put back into vecdeque, and retry it
self.pending_headers.push_back(header.clone());
needs_retry = true;
continue
}
resp.into_data()
}
};
valid_responses.push(SealedBlock::new(header.clone(), body));
}
}
if needs_retry {
// put response hashes back into bodies map since we aren't returning them as a
// response
for block in valid_responses {
let (header, body) = block.split_header_body();
self.bodies.insert(header, BodyResponse::Validated(body));
}
// put headers back since they were `take`n before
self.headers = Some(headers);
// create response for failing bodies
let hashes = self.remaining_bodies_hashes();
self.request.bodies = Some(self.client.get_block_bodies(hashes));
return None
}
Some(valid_responses)
}
fn on_headers_response(&mut self, headers: WithPeerId<Vec<Client::Header>>) {
let (peer, mut headers_falling) =
headers.map(|h| h.into_iter().map(SealedHeader::seal).collect::<Vec<_>>()).split();
// fill in the response if it's the correct length
if headers_falling.len() == self.count as usize {
// sort headers from highest to lowest block number
headers_falling.sort_unstable_by_key(|h| Reverse(h.number()));
// check the starting hash
if headers_falling[0].hash() == self.start_hash {
let headers_rising = headers_falling.iter().rev().cloned().collect::<Vec<_>>();
// check if the downloaded headers are valid
if let Err(err) = self.consensus.validate_header_range(&headers_rising) {
debug!(target: "downloaders", %err, ?self.start_hash, "Received bad header response");
self.client.report_bad_message(peer);
}
// get the bodies request so it can be polled later
let hashes = headers_falling.iter().map(|h| h.hash()).collect::<Vec<_>>();
// populate the pending headers
self.pending_headers = headers_falling.clone().into();
// set the actual request if it hasn't been started yet
if !self.has_bodies_request_started() {
// request the bodies for the downloaded headers
self.request.bodies = Some(self.client.get_block_bodies(hashes));
}
// set the headers response
self.headers = Some(headers_falling);
} else {
// received a different header than requested
self.client.report_bad_message(peer);
}
}
}
/// Returns whether or not a bodies request has been started, returning false if there is no
/// pending request.
const fn has_bodies_request_started(&self) -> bool {
self.request.bodies.is_some()
}
/// Returns the start hash for the request
pub const fn start_hash(&self) -> B256 {
self.start_hash
}
/// Returns the block count for the request
pub const fn count(&self) -> u64 {
self.count
}
}
impl<Client> Future for FetchFullBlockRangeFuture<Client>
where
Client: BlockClient<Header: Debug + BlockHeader + Sealable + Clone + Hash + Eq> + 'static,
{
type Output = Vec<SealedBlock<Client::Header, Client::Body>>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let this = self.get_mut();
loop {
match ready!(this.request.poll(cx)) {
// This branch handles headers responses from peers - it first ensures that the
// starting hash and number of headers matches what we requested.
//
// If these don't match, we penalize the peer and retry the request.
// If they do match, we sort the headers by block number and start the request for
// the corresponding block bodies.
//
// The next result that should be yielded by `poll` is the bodies response.
RangeResponseResult::Header(res) => {
match res {
Ok(headers) => {
this.on_headers_response(headers);
}
Err(err) => {
debug!(target: "downloaders", %err, ?this.start_hash, "Header range download failed");
}
}
if this.headers.is_none() {
// did not receive a correct response yet, retry
this.request.headers = Some(this.client.get_headers(HeadersRequest {
start: this.start_hash.into(),
limit: this.count,
direction: HeadersDirection::Falling,
}));
}
}
// This branch handles block body responses from peers - it first inserts the
// bodies into the `bodies` map, and then checks if the request is complete.
//
// If the request is not complete, and we need to request more bodies, we send
// a bodies request for the headers we don't yet have bodies for.
RangeResponseResult::Body(res) => {
match res {
Ok(bodies_resp) => {
let (peer, new_bodies) = bodies_resp.split();
// first insert the received bodies
this.insert_bodies(
new_bodies
.into_iter()
.map(|resp| WithPeerId::new(peer, resp))
.map(BodyResponse::PendingValidation),
);
if !this.is_bodies_complete() {
// get remaining hashes so we can send the next request
let req_hashes = this.remaining_bodies_hashes();
// set a new request
this.request.bodies = Some(this.client.get_block_bodies(req_hashes))
}
}
Err(err) => {
debug!(target: "downloaders", %err, ?this.start_hash, "Body range download failed");
}
}
if this.bodies.is_empty() {
// received bad response, re-request headers
// TODO: convert this into two futures, one which is a headers range
// future, and one which is a bodies range future.
//
// The headers range future should yield the bodies range future.
// The bodies range future should not have an Option<Vec<B256>>, it should
// have a populated Vec<B256> from the successful headers range future.
//
// This is optimal because we can not send a bodies request without
// first completing the headers request. This way we can get rid of the
// following `if let Some`. A bodies request should never be sent before
// the headers request completes, so this should always be `Some` anyways.
let hashes = this.remaining_bodies_hashes();
if !hashes.is_empty() {
this.request.bodies = Some(this.client.get_block_bodies(hashes));
}
}
}
}
if let Some(res) = this.take_blocks() {
return Poll::Ready(res)
}
}
}
}
/// A request for a range of full blocks. Polling this will poll the inner headers and bodies
/// futures until they return responses. It will return either the header or body result, depending
/// on which future successfully returned.
struct FullBlockRangeRequest<Client>
where
Client: BlockClient,
{
headers: Option<<Client as HeadersClient>::Output>,
bodies: Option<<Client as BodiesClient>::Output>,
}
impl<Client> FullBlockRangeRequest<Client>
where
Client: BlockClient,
{
fn poll(
&mut self,
cx: &mut Context<'_>,
) -> Poll<RangeResponseResult<Client::Header, Client::Body>> {
if let Some(fut) = Pin::new(&mut self.headers).as_pin_mut() {
if let Poll::Ready(res) = fut.poll(cx) {
self.headers = None;
return Poll::Ready(RangeResponseResult::Header(res))
}
}
if let Some(fut) = Pin::new(&mut self.bodies).as_pin_mut() {
if let Poll::Ready(res) = fut.poll(cx) {
self.bodies = None;
return Poll::Ready(RangeResponseResult::Body(res))
}
}
Poll::Pending
}
}
// The result of a request for headers or block bodies. This is yielded by the
// `FullBlockRangeRequest` future.
enum RangeResponseResult<H, B> {
Header(PeerRequestResult<Vec<H>>),
Body(PeerRequestResult<Vec<B>>),
}
#[cfg(test)]
mod tests {
use reth_primitives::BlockBody;
use super::*;
use crate::test_utils::TestFullBlockClient;
use std::ops::Range;
#[tokio::test]
async fn download_single_full_block() {
let client = TestFullBlockClient::default();
let header: SealedHeader = SealedHeader::default();
let body = BlockBody::default();
client.insert(header.clone(), body.clone());
let client = FullBlockClient::test_client(client);
let received = client.get_full_block(header.hash()).await;
assert_eq!(received, SealedBlock::new(header, body));
}
#[tokio::test]
async fn download_single_full_block_range() {
let client = TestFullBlockClient::default();
let header: SealedHeader = SealedHeader::default();
let body = BlockBody::default();
client.insert(header.clone(), body.clone());
let client = FullBlockClient::test_client(client);
let received = client.get_full_block_range(header.hash(), 1).await;
let received = received.first().expect("response should include a block");
assert_eq!(*received, SealedBlock::new(header, body));
}
/// Inserts headers and returns the last header and block body.
fn insert_headers_into_client(
client: &TestFullBlockClient,
range: Range<usize>,
) -> (SealedHeader, BlockBody) {
let mut sealed_header: SealedHeader = SealedHeader::default();
let body = BlockBody::default();
for _ in range {
let (mut header, hash) = sealed_header.split();
// update to the next header
header.parent_hash = hash;
header.number += 1;
sealed_header = SealedHeader::seal(header);
client.insert(sealed_header.clone(), body.clone());
}
(sealed_header, body)
}
#[tokio::test]
async fn download_full_block_range() {
let client = TestFullBlockClient::default();
let (header, body) = insert_headers_into_client(&client, 0..50);
let client = FullBlockClient::test_client(client);
let received = client.get_full_block_range(header.hash(), 1).await;
let received = received.first().expect("response should include a block");
assert_eq!(*received, SealedBlock::new(header.clone(), body));
let received = client.get_full_block_range(header.hash(), 10).await;
assert_eq!(received.len(), 10);
for (i, block) in received.iter().enumerate() {
let expected_number = header.number - i as u64;
assert_eq!(block.header.number, expected_number);
}
}
#[tokio::test]
async fn download_full_block_range_over_soft_limit() {
// default soft limit is 20, so we will request 50 blocks
let client = TestFullBlockClient::default();
let (header, body) = insert_headers_into_client(&client, 0..50);
let client = FullBlockClient::test_client(client);
let received = client.get_full_block_range(header.hash(), 1).await;
let received = received.first().expect("response should include a block");
assert_eq!(*received, SealedBlock::new(header.clone(), body));
let received = client.get_full_block_range(header.hash(), 50).await;
assert_eq!(received.len(), 50);
for (i, block) in received.iter().enumerate() {
let expected_number = header.number - i as u64;
assert_eq!(block.header.number, expected_number);
}
}
#[tokio::test]
async fn download_full_block_range_with_invalid_header() {
let client = TestFullBlockClient::default();
let range_length: usize = 3;
let (header, _) = insert_headers_into_client(&client, 0..range_length);
let test_consensus = reth_consensus::test_utils::TestConsensus::default();
test_consensus.set_fail_validation(true);
test_consensus.set_fail_body_against_header(false);
let client = FullBlockClient::new(client, Arc::new(test_consensus));
let received = client.get_full_block_range(header.hash(), range_length as u64).await;
assert_eq!(received.len(), range_length);
for (i, block) in received.iter().enumerate() {
let expected_number = header.number - i as u64;
assert_eq!(block.header.number, expected_number);
}
}
}