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Shift changes into message handler and simple sync for rpc-rewrite

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Age Manning 2019-07-16 22:32:37 +10:00
parent 704263e35f
commit 414d41cb57
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GPG Key ID: 05EED64B79E06A93
11 changed files with 486 additions and 227 deletions
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4
beacon_node/eth2-libp2p/src/behaviour.rs
View File

@ -109,6 +109,9 @@ impl<TSubstream: AsyncRead + AsyncWrite> NetworkBehaviourEventProcess<RPCMessage
RPCMessage::PeerDialed(peer_id) => {
self.events.push(BehaviourEvent::PeerDialed(peer_id))
}
RPCMessage::PeerDisconnected(peer_id) => {
self.events.push(BehaviourEvent::PeerDisconnected(peer_id))
}
RPCMessage::RPC(peer_id, rpc_event) => {
self.events.push(BehaviourEvent::RPC(peer_id, rpc_event))
}
@ -174,6 +177,7 @@ impl<TSubstream: AsyncRead + AsyncWrite> Behaviour<TSubstream> {
pub enum BehaviourEvent {
RPC(PeerId, RPCEvent),
PeerDialed(PeerId),
PeerDisconnected(PeerId),
GossipMessage {
source: PeerId,
topics: Vec<TopicHash>,

8
beacon_node/eth2-libp2p/src/rpc/codec/base.rs
View File

@ -5,7 +5,7 @@ use bytes::BufMut;
use bytes::BytesMut;
use tokio::codec::{Decoder, Encoder};
pub(crate) trait OutboundCodec: Encoder + Decoder {
pub trait OutboundCodec: Encoder + Decoder {
type ErrorType;
fn decode_error(
@ -14,7 +14,7 @@ pub(crate) trait OutboundCodec: Encoder + Decoder {
) -> Result<Option<Self::ErrorType>, <Self as Decoder>::Error>;
}
pub(crate) struct BaseInboundCodec<TCodec>
pub struct BaseInboundCodec<TCodec>
where
TCodec: Encoder + Decoder,
{
@ -31,7 +31,7 @@ where
}
}
pub(crate) struct BaseOutboundCodec<TOutboundCodec>
pub struct BaseOutboundCodec<TOutboundCodec>
where
TOutboundCodec: OutboundCodec,
{
@ -109,7 +109,7 @@ where
debug_assert!(!src.is_empty());
let resp_byte = src.split_to(1);
let resp_code_byte = [0; 1];
let mut resp_code_byte = [0; 1];
resp_code_byte.copy_from_slice(&resp_byte);
let resp_code = u8::from_be_bytes(resp_code_byte);

12
beacon_node/eth2-libp2p/src/rpc/codec/ssz.rs
View File

@ -18,7 +18,7 @@ pub struct SSZInboundCodec {
impl SSZInboundCodec {
pub fn new(protocol: ProtocolId, max_packet_size: usize) -> Self {
let uvi_codec = UviBytes::default();
let mut uvi_codec = UviBytes::default();
uvi_codec.set_max_len(max_packet_size);
// this encoding only applies to ssz.
@ -41,7 +41,6 @@ impl Encoder for SSZInboundCodec {
RPCErrorResponse::Success(resp) => {
match resp {
RPCResponse::Hello(res) => res.as_ssz_bytes(),
RPCResponse::Goodbye => unreachable!(),
RPCResponse::BeaconBlockRoots(res) => res.as_ssz_bytes(),
RPCResponse::BeaconBlockHeaders(res) => res.headers, // already raw bytes
RPCResponse::BeaconBlockBodies(res) => res.block_bodies, // already raw bytes
@ -80,7 +79,9 @@ impl Decoder for SSZInboundCodec {
_ => Err(RPCError::InvalidProtocol("Unknown HELLO version")),
},
"goodbye" => match self.protocol.version.as_str() {
"1.0.0" => Ok(Some(RPCRequest::Goodbye(Goodbye::from_ssz_bytes(&packet)?))),
"1.0.0" => Ok(Some(RPCRequest::Goodbye(GoodbyeReason::from_ssz_bytes(
&packet,
)?))),
_ => Err(RPCError::InvalidProtocol(
"Unknown GOODBYE version.as_str()",
)),
@ -117,6 +118,7 @@ impl Decoder for SSZInboundCodec {
"Unknown BEACON_CHAIN_STATE version.",
)),
},
_ => Err(RPCError::InvalidProtocol("Unknown message name.")),
},
Ok(None) => Ok(None),
Err(e) => Err(e),
@ -133,7 +135,7 @@ pub struct SSZOutboundCodec {
impl SSZOutboundCodec {
pub fn new(protocol: ProtocolId, max_packet_size: usize) -> Self {
let uvi_codec = UviBytes::default();
let mut uvi_codec = UviBytes::default();
uvi_codec.set_max_len(max_packet_size);
// this encoding only applies to ssz.
@ -204,6 +206,8 @@ impl Decoder for SSZOutboundCodec {
"1.0.0" => Ok(Some(RPCResponse::BeaconBlockBodies(
BeaconBlockBodiesResponse {
block_bodies: packet.to_vec(),
// this gets filled in the protocol handler
block_roots: None,
},
))),
_ => Err(RPCError::InvalidProtocol(

247
beacon_node/eth2-libp2p/src/rpc/handler.rs
View File

@ -1,11 +1,13 @@
use super::protocol::{ProtocolId, RPCError, RPCProtocol, RPCRequest};
use super::methods::{RPCErrorResponse, RPCResponse, RequestId};
use super::protocol::{RPCError, RPCProtocol, RPCRequest};
use super::RPCEvent;
use crate::rpc::protocol::{InboundFramed, OutboundFramed};
use fnv::FnvHashMap;
use futures::prelude::*;
use libp2p::core::protocols_handler::{
KeepAlive, ProtocolsHandler, ProtocolsHandlerEvent, ProtocolsHandlerUpgrErr, SubstreamProtocol,
};
use libp2p::core::upgrade::{self, InboundUpgrade, OutboundUpgrade, WriteOne};
use libp2p::core::upgrade::{InboundUpgrade, OutboundUpgrade};
use smallvec::SmallVec;
use std::time::{Duration, Instant};
use tokio_io::{AsyncRead, AsyncWrite};
@ -14,7 +16,10 @@ use tokio_io::{AsyncRead, AsyncWrite};
pub const RESPONSE_TIMEOUT: u64 = 9;
/// Implementation of `ProtocolsHandler` for the RPC protocol.
pub struct RPCHandler<TSubstream> {
pub struct RPCHandler<TSubstream>
where
TSubstream: AsyncRead + AsyncWrite,
{
/// The upgrade for inbound substreams.
listen_protocol: SubstreamProtocol<RPCProtocol>,
@ -25,16 +30,19 @@ pub struct RPCHandler<TSubstream> {
events_out: SmallVec<[RPCEvent; 4]>,
/// Queue of outbound substreams to open.
dial_queue: SmallVec<[(usize, RPCRequest); 4]>,
dial_queue: SmallVec<[RPCEvent; 4]>,
/// Current number of concurrent outbound substreams being opened.
dial_negotiated: u32,
/// Map of current substreams awaiting a response to an RPC request.
waiting_substreams: FnvHashMap<usize, SubstreamState<TSubstream>>,
waiting_substreams: FnvHashMap<RequestId, WaitingResponse<TSubstream>>,
/// List of outbound substreams that need to be driven to completion.
substreams: Vec<SubstreamState<TSubstream>>,
/// Sequential Id for waiting substreams.
current_substream_id: usize,
current_substream_id: RequestId,
/// Maximum number of concurrent outbound substreams being opened. Value is never modified.
max_dial_negotiated: u32,
@ -46,22 +54,40 @@ pub struct RPCHandler<TSubstream> {
inactive_timeout: Duration,
}
/// State of an outbound substream. Either waiting for a response, or in the process of sending.
pub enum SubstreamState<TSubstream> {
/// An outbound substream is waiting a response from the user.
WaitingResponse {
/// The negotiated substream.
substream: upgrade::Negotiated<TSubstream>,
/// The protocol that was negotiated.
negotiated_protocol: ProtocolId,
/// The time until we close the substream.
struct WaitingResponse<TSubstream> {
/// The framed negotiated substream.
substream: InboundFramed<TSubstream>,
/// The time when the substream is closed.
timeout: Instant,
},
/// A response has been sent and we are waiting for the stream to close.
PendingWrite(WriteOne<upgrade::Negotiated<TSubstream>, Vec<u8>>),
}
impl<TSubstream> RPCHandler<TSubstream> {
/// State of an outbound substream. Either waiting for a response, or in the process of sending.
pub enum SubstreamState<TSubstream>
where
TSubstream: AsyncRead + AsyncWrite,
{
/// A response has been sent, pending writing and flush.
ResponsePendingSend {
substream: futures::sink::Send<InboundFramed<TSubstream>>,
},
/// A request has been sent, and we are awaiting a response. This future is driven in the
/// handler because GOODBYE requests can be handled and responses dropped instantly.
RequestPendingResponse {
/// The framed negotiated substream.
substream: OutboundFramed<TSubstream>,
/// Keeps track of the request id and the request to permit forming advanced responses which require
/// data from the request.
rpc_event: RPCEvent,
/// The time when the substream is closed.
timeout: Instant,
},
}
impl<TSubstream> RPCHandler<TSubstream>
where
TSubstream: AsyncRead + AsyncWrite,
{
pub fn new(
listen_protocol: SubstreamProtocol<RPCProtocol>,
inactive_timeout: Duration,
@ -73,7 +99,8 @@ impl<TSubstream> RPCHandler<TSubstream> {
dial_queue: SmallVec::new(),
dial_negotiated: 0,
waiting_substreams: FnvHashMap::default(),
current_substream_id: 0,
substreams: Vec::new(),
current_substream_id: 1,
max_dial_negotiated: 8,
keep_alive: KeepAlive::Yes,
inactive_timeout,
@ -101,15 +128,19 @@ impl<TSubstream> RPCHandler<TSubstream> {
&mut self.listen_protocol
}
/// Opens an outbound substream with `upgrade`.
/// Opens an outbound substream with a request.
#[inline]
pub fn send_request(&mut self, request_id: usize, upgrade: RPCRequest) {
pub fn send_request(&mut self, rpc_event: RPCEvent) {
self.keep_alive = KeepAlive::Yes;
self.dial_queue.push((request_id, upgrade));
self.dial_queue.push(rpc_event);
}
}
impl<TSubstream> Default for RPCHandler<TSubstream> {
impl<TSubstream> Default for RPCHandler<TSubstream>
where
TSubstream: AsyncRead + AsyncWrite,
{
fn default() -> Self {
RPCHandler::new(SubstreamProtocol::new(RPCProtocol), Duration::from_secs(30))
}
@ -125,7 +156,7 @@ where
type Substream = TSubstream;
type InboundProtocol = RPCProtocol;
type OutboundProtocol = RPCRequest;
type OutboundOpenInfo = usize; // request_id
type OutboundOpenInfo = RPCEvent; // Keep track of the id and the request
#[inline]
fn listen_protocol(&self) -> SubstreamProtocol<Self::InboundProtocol> {
@ -137,7 +168,7 @@ where
&mut self,
out: <RPCProtocol as InboundUpgrade<TSubstream>>::Output,
) {
let (substream, req, negotiated_protocol) = out;
let (req, substream) = out;
// drop the stream and return a 0 id for goodbye "requests"
if let r @ RPCRequest::Goodbye(_) = req {
self.events_out.push(RPCEvent::Request(0, r));
@ -145,9 +176,8 @@ where
}
// New inbound request. Store the stream and tag the output.
let awaiting_stream = SubstreamState::WaitingResponse {
let awaiting_stream = WaitingResponse {
substream,
negotiated_protocol,
timeout: Instant::now() + Duration::from_secs(RESPONSE_TIMEOUT),
};
self.waiting_substreams
@ -162,7 +192,7 @@ where
fn inject_fully_negotiated_outbound(
&mut self,
out: <RPCRequest as OutboundUpgrade<TSubstream>>::Output,
request_id: Self::OutboundOpenInfo,
rpc_event: Self::OutboundOpenInfo,
) {
self.dial_negotiated -= 1;
@ -175,7 +205,18 @@ where
self.keep_alive = KeepAlive::Yes;
}
self.events_out.push(RPCEvent::Response(request_id, out));
// add the stream to substreams if we expect a response, otherwise drop the stream.
if let RPCEvent::Request(id, req) = rpc_event {
if req.expect_response() {
let awaiting_stream = SubstreamState::RequestPendingResponse {
substream: out,
rpc_event: RPCEvent::Request(id, req),
timeout: Instant::now() + Duration::from_secs(RESPONSE_TIMEOUT),
};
self.substreams.push(awaiting_stream);
}
}
}
// Note: If the substream has closed due to inactivity, or the substream is in the
@ -183,25 +224,17 @@ where
#[inline]
fn inject_event(&mut self, rpc_event: Self::InEvent) {
match rpc_event {
RPCEvent::Request(rpc_id, req) => self.send_request(rpc_id, req),
RPCEvent::Request(_, _) => self.send_request(rpc_event),
RPCEvent::Response(rpc_id, res) => {
// check if the stream matching the response still exists
if let Some(waiting_stream) = self.waiting_substreams.get_mut(&rpc_id) {
if let Some(waiting_stream) = self.waiting_substreams.remove(&rpc_id) {
// only send one response per stream. This must be in the waiting state.
if let SubstreamState::WaitingResponse {
substream,
negotiated_protocol,
..
} = *waiting_stream
{
*waiting_stream = SubstreamState::PendingWrite(upgrade::write_one(
substream,
res.encode(negotiated_protocol)
.expect("Response should always be encodeable"),
));
}
self.substreams.push(SubstreamState::ResponsePendingSend {
substream: waiting_stream.substream.send(res),
});
}
}
RPCEvent::Error(_, _) => {}
}
}
@ -213,7 +246,6 @@ where
<Self::OutboundProtocol as OutboundUpgrade<Self::Substream>>::Error,
>,
) {
dbg!(error);
if self.pending_error.is_none() {
self.pending_error = Some(error);
}
@ -234,30 +266,7 @@ where
return Err(err);
}
// prioritise sending responses for waiting substreams
self.waiting_substreams.retain(|_k, mut waiting_stream| {
match waiting_stream {
SubstreamState::PendingWrite(write_one) => {
match write_one.poll() {
Ok(Async::Ready(_socket)) => false,
Ok(Async::NotReady) => true,
Err(_e) => {
//TODO: Add logging
// throw away streams that error
false
}
}
}
SubstreamState::WaitingResponse { timeout, .. } => {
if Instant::now() > *timeout {
false
} else {
true
}
}
}
});
// return any events that need to be reported
if !self.events_out.is_empty() {
return Ok(Async::Ready(ProtocolsHandlerEvent::Custom(
self.events_out.remove(0),
@ -266,21 +275,117 @@ where
self.events_out.shrink_to_fit();
}
// remove any streams that have expired
self.waiting_substreams.retain(|_k, waiting_stream| {
if Instant::now() > waiting_stream.timeout {
false
} else {
true
}
});
// drive streams that need to be processed
for n in (0..self.substreams.len()).rev() {
let stream = self.substreams.swap_remove(n);
match stream {
SubstreamState::ResponsePendingSend { mut substream } => {
match substream.poll() {
Ok(Async::Ready(_substream)) => {} // sent and flushed
Ok(Async::NotReady) => {
self.substreams
.push(SubstreamState::ResponsePendingSend { substream });
}
Err(e) => {
return Ok(Async::Ready(ProtocolsHandlerEvent::Custom(
RPCEvent::Error(0, e),
)))
}
}
}
SubstreamState::RequestPendingResponse {
mut substream,
rpc_event,
timeout,
} => match substream.poll() {
Ok(Async::Ready(response)) => {
if let Some(response) = response {
return Ok(Async::Ready(ProtocolsHandlerEvent::Custom(
build_response(rpc_event, response),
)));
} else {
// stream closed early
return Ok(Async::Ready(ProtocolsHandlerEvent::Custom(
RPCEvent::Error(
rpc_event.id(),
RPCError::Custom("Stream Closed Early".into()),
),
)));
}
}
Ok(Async::NotReady) => {
if Instant::now() < timeout {
self.substreams
.push(SubstreamState::RequestPendingResponse {
substream,
rpc_event,
timeout,
});
}
}
Err(e) => {
return Ok(Async::Ready(ProtocolsHandlerEvent::Custom(
RPCEvent::Error(rpc_event.id(), e.into()),
)))
}
},
}
}
// establish outbound substreams
if !self.dial_queue.is_empty() {
if self.dial_negotiated < self.max_dial_negotiated {
self.dial_negotiated += 1;
let (request_id, req) = self.dial_queue.remove(0);
let rpc_event = self.dial_queue.remove(0);
if let RPCEvent::Request(id, req) = rpc_event {
return Ok(Async::Ready(
ProtocolsHandlerEvent::OutboundSubstreamRequest {
protocol: SubstreamProtocol::new(req),
info: request_id,
protocol: SubstreamProtocol::new(req.clone()),
info: RPCEvent::Request(id, req),
},
));
}
}
} else {
self.dial_queue.shrink_to_fit();
}
Ok(Async::NotReady)
}
}
/// Given a response back from a peer and the request that sent it, construct a response to send
/// back to the user. This allows for some data manipulation of responses given requests.
fn build_response(rpc_event: RPCEvent, rpc_response: RPCErrorResponse) -> RPCEvent {
let id = rpc_event.id();
// handle the types of responses
match rpc_response {
RPCErrorResponse::Success(response) => {
match response {
// if the response is block roots, tag on the extra request data
RPCResponse::BeaconBlockBodies(mut resp) => {
if let RPCEvent::Request(_id, RPCRequest::BeaconBlockBodies(bodies_req)) =
rpc_event
{
resp.block_roots = Some(bodies_req.block_roots);
}
RPCEvent::Response(
id,
RPCErrorResponse::Success(RPCResponse::BeaconBlockBodies(resp)),
)
}
_ => RPCEvent::Response(id, RPCErrorResponse::Success(response)),
}
}
_ => RPCEvent::Response(id, rpc_response),
}
}

62
beacon_node/eth2-libp2p/src/rpc/methods.rs
View File

@ -2,12 +2,14 @@
use ssz::{impl_decode_via_from, impl_encode_via_from};
use ssz_derive::{Decode, Encode};
use types::{Epoch, Hash256, Slot};
use types::{BeaconBlockBody, BeaconBlockHeader, Epoch, Hash256, Slot};
/* Request/Response data structures for RPC methods */
/* Requests */
pub type RequestId = usize;
/// The HELLO request/response handshake message.
#[derive(Encode, Decode, Clone, Debug)]
pub struct HelloMessage {
@ -33,10 +35,10 @@ pub struct HelloMessage {
/// The reason given for a `Goodbye` message.
///
/// Note: any unknown `u64::into(n)` will resolve to `Goodbye::Unknown` for any unknown `n`,
/// however `Goodbye::Unknown.into()` will go into `0_u64`. Therefore de-serializing then
/// however `GoodbyeReason::Unknown.into()` will go into `0_u64`. Therefore de-serializing then
/// re-serializing may not return the same bytes.
#[derive(Debug, Clone)]
pub enum Goodbye {
pub enum GoodbyeReason {
/// This node has shutdown.
ClientShutdown = 1,
@ -50,25 +52,25 @@ pub enum Goodbye {
Unknown = 0,
}
impl From<u64> for Goodbye {
fn from(id: u64) -> Goodbye {
impl From<u64> for GoodbyeReason {
fn from(id: u64) -> GoodbyeReason {
match id {
1 => Goodbye::ClientShutdown,
2 => Goodbye::IrreleventNetwork,
3 => Goodbye::Fault,
_ => Goodbye::Unknown,
1 => GoodbyeReason::ClientShutdown,
2 => GoodbyeReason::IrreleventNetwork,
3 => GoodbyeReason::Fault,
_ => GoodbyeReason::Unknown,
}
}
}
impl Into<u64> for Goodbye {
impl Into<u64> for GoodbyeReason {
fn into(self) -> u64 {
self as u64
}
}
impl_encode_via_from!(Goodbye, u64);
impl_decode_via_from!(Goodbye, u64);
impl_encode_via_from!(GoodbyeReason, u64);
impl_decode_via_from!(GoodbyeReason, u64);
/// Request a number of beacon block roots from a peer.
#[derive(Encode, Decode, Clone, Debug, PartialEq)]
@ -134,6 +136,11 @@ pub struct BeaconBlockHeadersResponse {
pub headers: Vec<u8>,
}
#[derive(Encode, Decode, Debug)]
pub struct EncodeableBeaconBlockHeadersResponse {
pub headers: Vec<BeaconBlockHeader>,
}
/// Request a number of beacon block bodies from a peer.
#[derive(Encode, Decode, Clone, Debug, PartialEq)]
pub struct BeaconBlockBodiesRequest {
@ -144,10 +151,28 @@ pub struct BeaconBlockBodiesRequest {
/// Response containing the list of requested beacon block bodies.
#[derive(Clone, Debug, PartialEq)]
pub struct BeaconBlockBodiesResponse {
/// The list of hashes that were sent in the request and match these roots response. None when
/// sending outbound.
pub block_roots: Option<Vec<Hash256>>,
/// The list of ssz-encoded beacon block bodies being requested.
pub block_bodies: Vec<u8>,
}
/// The decoded version of `BeaconBlockBodiesResponse` which is expected in `SimpleSync`.
pub struct DecodedBeaconBlockBodiesResponse {
/// The list of hashes sent in the request to get this response.
pub block_roots: Vec<Hash256>,
/// The valid decoded block bodies.
pub block_bodies: Vec<BeaconBlockBody>,
}
//TODO: Build a cleaner API for this encoding/decoding
/// This only exists to encode/decode beacon block bodies according to the wire protocol.
#[derive(Encode, Decode)]
pub struct EncodeableBeaconBlockBodiesResponse {
pub block_bodies: Vec<BeaconBlockBody>,
}
/// Request values for tree hashes which yield a blocks `state_root`.
#[derive(Encode, Decode, Clone, Debug, PartialEq)]
pub struct BeaconChainStateRequest {
@ -170,8 +195,6 @@ pub struct BeaconChainStateResponse {
pub enum RPCResponse {
/// A HELLO message.
Hello(HelloMessage),
/// An empty field returned from sending a GOODBYE request.
Goodbye, // empty value - required for protocol handler
/// A response to a get BEACON_BLOCK_ROOTS request.
BeaconBlockRoots(BeaconBlockRootsResponse),
/// A response to a get BEACON_BLOCK_HEADERS request.
@ -182,6 +205,7 @@ pub enum RPCResponse {
BeaconChainState(BeaconChainStateResponse),
}
#[derive(Debug)]
pub enum RPCErrorResponse {
Success(RPCResponse),
EncodingError,
@ -230,8 +254,14 @@ impl RPCErrorResponse {
}
}
#[derive(Encode, Decode)]
#[derive(Encode, Decode, Debug)]
pub struct ErrorMessage {
/// The UTF-8 encoded Error message string.
error_message: Vec<u8>,
pub error_message: Vec<u8>,
}
impl ErrorMessage {
pub fn as_string(&self) -> String {
String::from_utf8(self.error_message.clone()).unwrap_or_else(|_| "".into())
}
}

30
beacon_node/eth2-libp2p/src/rpc/mod.rs
View File

@ -11,8 +11,8 @@ use libp2p::core::swarm::{
ConnectedPoint, NetworkBehaviour, NetworkBehaviourAction, PollParameters,
};
use libp2p::{Multiaddr, PeerId};
pub use methods::{ErrorMessage, HelloMessage, RPCErrorResponse, RPCResponse};
pub use protocol::{RPCProtocol, RPCRequest};
pub use methods::{ErrorMessage, HelloMessage, RPCErrorResponse, RPCResponse, RequestId};
pub use protocol::{RPCError, RPCProtocol, RPCRequest};
use slog::o;
use std::marker::PhantomData;
use tokio::io::{AsyncRead, AsyncWrite};
@ -24,15 +24,27 @@ mod protocol;
// mod request_response;
/// The return type used in the behaviour and the resultant event from the protocols handler.
#[derive(Debug, Clone)]
#[derive(Debug)]
pub enum RPCEvent {
/// A request that was received from the RPC protocol. The first parameter is a sequential
/// id which tracks an awaiting substream for the response.
Request(usize, RPCRequest),
Request(RequestId, RPCRequest),
/// A response that has been received from the RPC protocol. The first parameter returns
/// that which was sent with the corresponding request.
Response(usize, RPCResponse),
Response(RequestId, RPCErrorResponse),
/// An Error occurred.
Error(RequestId, RPCError),
}
impl RPCEvent {
pub fn id(&self) -> usize {
match *self {
RPCEvent::Request(id, _) => id,
RPCEvent::Response(id, _) => id,
RPCEvent::Error(id, _) => id,
}
}
}
/// Implements the libp2p `NetworkBehaviour` trait and therefore manages network-level
@ -92,7 +104,12 @@ where
}
}
fn inject_disconnected(&mut self, _: &PeerId, _: ConnectedPoint) {}
fn inject_disconnected(&mut self, peer_id: &PeerId, _: ConnectedPoint) {
// inform the rpc handler that the peer has disconnected
self.events.push(NetworkBehaviourAction::GenerateEvent(
RPCMessage::PeerDisconnected(peer_id.clone()),
));
}
fn inject_node_event(
&mut self,
@ -126,4 +143,5 @@ where
pub enum RPCMessage {
RPC(PeerId, RPCEvent),
PeerDialed(PeerId),
PeerDisconnected(PeerId),
}

86
beacon_node/eth2-libp2p/src/rpc/protocol.rs
View File

@ -9,13 +9,10 @@ use futures::{
sink, stream, Sink, Stream,
};
use libp2p::core::{upgrade, InboundUpgrade, OutboundUpgrade, UpgradeInfo};
use ssz::Encode;
use ssz_derive::{Decode, Encode};
use std::io;
use std::time::Duration;
use tokio::codec::Framed;
use tokio::io::{AsyncRead, AsyncWrite};
use tokio::prelude::future::MapErr;
use tokio::prelude::*;
use tokio::timer::timeout;
use tokio::util::FutureExt;
@ -24,25 +21,25 @@ use tokio::util::FutureExt;
const MAX_RPC_SIZE: usize = 4_194_304; // 4M
/// The protocol prefix the RPC protocol id.
const PROTOCOL_PREFIX: &str = "/eth/serenity/rpc/";
/// The number of seconds to wait for a response before the stream is terminated.
const RESPONSE_TIMEOUT: u64 = 10;
/// The number of seconds to wait for a request once a protocol has been established before the stream is terminated.
const REQUEST_TIMEOUT: u64 = 3;
/// Implementation of the `ConnectionUpgrade` for the RPC protocol.
#[derive(Debug, Clone)]
pub struct RPCProtocol;
impl UpgradeInfo for RPCProtocol {
type Info = &'static [u8];
type Info = RawProtocolId;
type InfoIter = Vec<Self::Info>;
fn protocol_info(&self) -> Self::InfoIter {
vec![
b"/eth/serenity/rpc/hello/1.0.0/ssz",
b"/eth/serenity/rpc/goodbye/1.0.0/ssz",
b"/eth/serenity/rpc/beacon_block_roots/1.0.0/ssz",
b"/eth/serenity/rpc/beacon_block_headers/1.0.0/ssz",
b"/eth/serenity/rpc/beacon_block_bodies/1.0.0/ssz",
b"/eth/serenity/rpc/beacon_chain_state/1.0.0/ssz",
ProtocolId::new("hello", "1.0.0", "ssz").into(),
ProtocolId::new("goodbye", "1.0.0", "ssz").into(),
ProtocolId::new("beacon_block_roots", "1.0.0", "ssz").into(),
ProtocolId::new("beacon_block_headers", "1.0.0", "ssz").into(),
ProtocolId::new("beacon_block_bodies", "1.0.0", "ssz").into(),
ProtocolId::new("beacon_chain_state", "1.0.0", "ssz").into(),
]
}
}
@ -106,16 +103,18 @@ impl Into<RawProtocolId> for ProtocolId {
// The inbound protocol reads the request, decodes it and returns the stream to the protocol
// handler to respond to once ready.
type InboundFramed<TSocket> = Framed<upgrade::Negotiated<TSocket>, InboundCodec>;
type FnAndThen<TSocket> =
fn((Option<RPCRequest>, InboundFramed<TSocket>)) -> FutureResult<RPCRequest, RPCError>;
pub type InboundOutput<TSocket> = (RPCRequest, InboundFramed<TSocket>);
pub type InboundFramed<TSocket> = Framed<upgrade::Negotiated<TSocket>, InboundCodec>;
type FnAndThen<TSocket> = fn(
(Option<RPCRequest>, InboundFramed<TSocket>),
) -> FutureResult<InboundOutput<TSocket>, RPCError>;
type FnMapErr<TSocket> = fn(timeout::Error<(RPCError, InboundFramed<TSocket>)>) -> RPCError;
impl<TSocket> InboundUpgrade<TSocket> for RPCProtocol
where
TSocket: AsyncRead + AsyncWrite,
{
type Output = RPCRequest;
type Output = InboundOutput<TSocket>;
type Error = RPCError;
type Future = future::AndThen<
@ -123,31 +122,34 @@ where
timeout::Timeout<stream::StreamFuture<InboundFramed<TSocket>>>,
FnMapErr<TSocket>,
>,
FutureResult<RPCRequest, RPCError>,
FutureResult<InboundOutput<TSocket>, RPCError>,
FnAndThen<TSocket>,
>;
fn upgrade_inbound(
self,
socket: upgrade::Negotiated<TSocket>,
protocol: &'static [u8],
protocol: RawProtocolId,
) -> Self::Future {
// TODO: Verify this
let protocol_id =
ProtocolId::from_bytes(protocol).expect("Can decode all supported protocols");
ProtocolId::from_bytes(&protocol).expect("Can decode all supported protocols");
match protocol_id.encoding.as_str() {
"ssz" | _ => {
let ssz_codec = BaseInboundCodec::new(SSZInboundCodec::new(protocol_id, 4096));
let ssz_codec =
BaseInboundCodec::new(SSZInboundCodec::new(protocol_id, MAX_RPC_SIZE));
let codec = InboundCodec::SSZ(ssz_codec);
Framed::new(socket, codec)
.into_future()
.timeout(Duration::from_secs(RESPONSE_TIMEOUT))
.timeout(Duration::from_secs(REQUEST_TIMEOUT))
.map_err(RPCError::from as FnMapErr<TSocket>)
.and_then({
|(madouby, _)| match madouby {
Some(x) => futures::future::ok(x),
None => futures::future::err(RPCError::Custom("Go home".into())),
|(req, stream)| match req {
Some(req) => futures::future::ok((req, stream)),
None => futures::future::err(RPCError::Custom(
"Stream terminated early".into(),
)),
}
} as FnAndThen<TSocket>)
}
@ -163,7 +165,7 @@ where
#[derive(Debug, Clone)]
pub enum RPCRequest {
Hello(HelloMessage),
Goodbye(Goodbye),
Goodbye(GoodbyeReason),
BeaconBlockRoots(BeaconBlockRootsRequest),
BeaconBlockHeaders(BeaconBlockHeadersRequest),
BeaconBlockBodies(BeaconBlockBodiesRequest),
@ -202,28 +204,12 @@ impl RPCRequest {
}
}
/// Encodes the Request object based on the negotiated protocol.
pub fn encode(&self, protocol: ProtocolId) -> Result<Vec<u8>, RPCError> {
// Match on the encoding and in the future, the version
match protocol.encoding.as_str() {
"ssz" => Ok(self.ssz_encode()),
_ => {
return Err(RPCError::Custom(format!(
"Unknown Encoding: {}",
protocol.encoding
)))
}
}
}
fn ssz_encode(&self) -> Vec<u8> {
/// This specifies whether a stream should remain open and await a response, given a request.
/// A GOODBYE request has no response.
pub fn expect_response(&self) -> bool {
match self {
RPCRequest::Hello(req) => req.as_ssz_bytes(),
RPCRequest::Goodbye(req) => req.as_ssz_bytes(),
RPCRequest::BeaconBlockRoots(req) => req.as_ssz_bytes(),
RPCRequest::BeaconBlockHeaders(req) => req.as_ssz_bytes(),
RPCRequest::BeaconBlockBodies(req) => req.as_ssz_bytes(),
RPCRequest::BeaconChainState(req) => req.as_ssz_bytes(),
RPCRequest::Goodbye(_) => false,
_ => true,
}
}
}
@ -232,7 +218,7 @@ impl RPCRequest {
/* Outbound upgrades */
type OutboundFramed<TSocket> = Framed<upgrade::Negotiated<TSocket>, OutboundCodec>;
pub type OutboundFramed<TSocket> = Framed<upgrade::Negotiated<TSocket>, OutboundCodec>;
impl<TSocket> OutboundUpgrade<TSocket> for RPCRequest
where
@ -323,11 +309,11 @@ impl std::error::Error for RPCError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match *self {
RPCError::ReadError(ref err) => Some(err),
RPCError::SSZDecodeError(ref err) => None,
RPCError::InvalidProtocol(ref err) => None,
RPCError::SSZDecodeError(_) => None,
RPCError::InvalidProtocol(_) => None,
RPCError::IoError(ref err) => Some(err),
RPCError::StreamTimeout => None,
RPCError::Custom(ref err) => None,
RPCError::Custom(_) => None,
}
}
}

5
beacon_node/eth2-libp2p/src/service.rs
View File

@ -133,6 +133,9 @@ impl Stream for Service {
BehaviourEvent::PeerDialed(peer_id) => {
return Ok(Async::Ready(Some(Libp2pEvent::PeerDialed(peer_id))));
}
BehaviourEvent::PeerDisconnected(peer_id) => {
return Ok(Async::Ready(Some(Libp2pEvent::PeerDisconnected(peer_id))));
}
},
Ok(Async::Ready(None)) => unreachable!("Swarm stream shouldn't end"),
Ok(Async::NotReady) => break,
@ -182,6 +185,8 @@ pub enum Libp2pEvent {
RPC(PeerId, RPCEvent),
/// Initiated the connection to a new peer.
PeerDialed(PeerId),
/// A peer has disconnected.
PeerDisconnected(PeerId),
/// Received pubsub message.
PubsubMessage {
source: PeerId,

143
beacon_node/network/src/message_handler.rs
View File

@ -3,22 +3,19 @@ use crate::service::{NetworkMessage, OutgoingMessage};
use crate::sync::SimpleSync;
use beacon_chain::{BeaconChain, BeaconChainTypes};
use crossbeam_channel::{unbounded as channel, Sender};
use eth2_libp2p::rpc::methods::*;
use eth2_libp2p::{
behaviour::PubsubMessage,
rpc::{methods::GoodbyeReason, RPCRequest, RPCResponse, RequestId},
rpc::{RPCError, RPCErrorResponse, RPCRequest, RPCResponse, RequestId},
PeerId, RPCEvent,
};
use futures::future;
use slog::{debug, warn};
use slog::{debug, error, warn};
use ssz::Decode;
use std::collections::HashMap;
use std::sync::Arc;
use std::time::Instant;
/// Timeout for RPC requests.
// const REQUEST_TIMEOUT: Duration = Duration::from_secs(30);
/// Timeout before banning a peer for non-identification.
// const HELLO_TIMEOUT: Duration = Duration::from_secs(30);
/// Handles messages received from the network and client and organises syncing.
pub struct MessageHandler<T: BeaconChainTypes> {
/// Currently loaded and initialised beacon chain.
@ -32,7 +29,7 @@ pub struct MessageHandler<T: BeaconChainTypes> {
}
/// Types of messages the handler can receive.
#[derive(Debug, Clone)]
#[derive(Debug)]
pub enum HandlerMessage {
/// We have initiated a connection to a new peer.
PeerDialed(PeerId),
@ -87,6 +84,10 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
HandlerMessage::PeerDialed(peer_id) => {
self.sync.on_connect(peer_id, &mut self.network_context);
}
// A peer has disconnected
HandlerMessage::PeerDisconnected(peer_id) => {
self.sync.on_disconnect(peer_id);
}
// we have received an RPC message request/response
HandlerMessage::RPC(peer_id, rpc_event) => {
self.handle_rpc_message(peer_id, rpc_event);
@ -105,9 +106,9 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
/// Handle RPC messages
fn handle_rpc_message(&mut self, peer_id: PeerId, rpc_message: RPCEvent) {
match rpc_message {
RPCEvent::Request { id, body, .. // TODO: Clean up RPC Message types, have a cleaner type by this point.
} => self.handle_rpc_request(peer_id, id, body),
RPCEvent::Response { id, result, .. } => self.handle_rpc_response(peer_id, id, result),
RPCEvent::Request(id, req) => self.handle_rpc_request(peer_id, id, req),
RPCEvent::Response(id, resp) => self.handle_rpc_response(peer_id, id, resp),
RPCEvent::Error(id, error) => self.handle_rpc_error(peer_id, id, error),
}
}
@ -150,27 +151,59 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
/// An RPC response has been received from the network.
// we match on id and ignore responses past the timeout.
fn handle_rpc_response(&mut self, peer_id: PeerId, id: RequestId, response: RPCResponse) {
// if response id is not related to a request, ignore (likely RPC timeout)
fn handle_rpc_response(
&mut self,
peer_id: PeerId,
id: RequestId,
error_response: RPCErrorResponse,
) {
//TODO: Potentially do not need to keep track of this at all. This has all been shifted
//into libp2p stack. Tracking Id's will only be necessary if a response is important
//relative to a specific request. Note: BeaconBlockBodies already returns with the data
//associated with its request.
// Currently leave this here for testing, to ensure it is redundant.
if self
.network_context
.outstanding_outgoing_request_ids
.remove(&(peer_id.clone(), id))
.is_none()
{
warn!(
// This should never happen. The RPC layer handles all timeouts and ensures a response
// matches a request.
debug_assert!(false);
error!(
self.log,
"Unknown ResponseId for incoming RPCRequest";
"peer" => format!("{:?}", peer_id),
"request_id" => format!("{:?}", id)
"request_id" => format!("{}", id)
);
return;
}
// an error could have occurred.
// TODO: Handle Error gracefully
match error_response {
RPCErrorResponse::EncodingError => {
warn!(self.log, "Encoding Error"; "peer" => format!("{:?}", peer_id), "request_id" => format!("{}",id))
}
RPCErrorResponse::InvalidRequest(error) => {
warn!(self.log, "";"peer" => format!("{:?}", peer_id), "Invalid Request" => error.as_string())
}
RPCErrorResponse::ServerError(error) => {
warn!(self.log, "";"peer" => format!("{:?}", peer_id), "Server Error" => error.as_string())
}
RPCErrorResponse::Unknown(error) => {
warn!(self.log, "";"peer" => format!("{:?}", peer_id), "Unknown Error" => error.as_string())
}
RPCErrorResponse::Success(response) => {
match response {
RPCResponse::Hello(hello_message) => {
self.sync
.on_hello_response(peer_id, hello_message, &mut self.network_context);
self.sync.on_hello_response(
peer_id,
hello_message,
&mut self.network_context,
);
}
RPCResponse::BeaconBlockRoots(response) => {
self.sync.on_beacon_block_roots_response(
@ -180,18 +213,26 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
);
}
RPCResponse::BeaconBlockHeaders(response) => {
if let Some(decoded_block_headers) = self.decode_block_headers(response) {
self.sync.on_beacon_block_headers_response(
peer_id,
response,
decoded_block_headers,
&mut self.network_context,
);
} else {
warn!(self.log, "Peer sent invalid block headers";"peer" => format!("{:?}", peer_id))
}
}
RPCResponse::BeaconBlockBodies(response) => {
if let Some(decoded_block_bodies) = self.decode_block_bodies(response) {
self.sync.on_beacon_block_bodies_response(
peer_id,
response,
decoded_block_bodies,
&mut self.network_context,
);
} else {
warn!(self.log, "Peer sent invalid block bodies";"peer" => format!("{:?}", peer_id))
}
}
RPCResponse::BeaconChainState(_) => {
// We do not implement this endpoint, it is not required and will only likely be
@ -201,7 +242,46 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
// beacon state RPC request.
warn!(self.log, "BeaconChainState RPC call is not supported.");
}
};
}
}
}
}
/// Verifies and decodes the ssz-encoded block bodies received from peers.
fn decode_block_bodies(
&self,
bodies_response: BeaconBlockBodiesResponse,
) -> Option<DecodedBeaconBlockBodiesResponse> {
//TODO: Implement faster block verification before decoding entirely
let simple_decoded_bodies =
EncodeableBeaconBlockBodiesResponse::from_ssz_bytes(&bodies_response.block_bodies);
//TODO: Potentially improve the types used here for SSZ encoding/decoding
if let Ok(simple_decoded_bodies) = simple_decoded_bodies {
Some(DecodedBeaconBlockBodiesResponse {
block_roots: bodies_response
.block_roots
.expect("Responses must have associated roots"),
block_bodies: simple_decoded_bodies.block_bodies,
})
} else {
None
}
}
/// Verifies and decodes the ssz-encoded block headers received from peers.
fn decode_block_headers(
&self,
headers_response: BeaconBlockHeadersResponse,
) -> Option<EncodeableBeaconBlockHeadersResponse> {
//TODO: Implement faster header verification before decoding entirely
EncodeableBeaconBlockHeadersResponse::from_ssz_bytes(&headers_response.headers).ok()
}
/// Handle various RPC errors
fn handle_rpc_error(&mut self, peer_id: PeerId, request_id: RequestId, error: RPCError) {
//TODO: Handle error correctly
warn!(self.log, "RPC Error"; "Peer" => format!("{:?}", peer_id), "Request Id" => format!("{}", request_id), "Error" => format!("{:?}", error));
}
/// Handle RPC messages
@ -252,16 +332,10 @@ impl NetworkContext {
self.outstanding_outgoing_request_ids
.insert((peer_id.clone(), id), Instant::now());
self.send_rpc_event(
peer_id,
RPCEvent::Request {
id,
method_id: rpc_request.method_id(),
body: rpc_request,
},
);
self.send_rpc_event(peer_id, RPCEvent::Request(id, rpc_request));
}
//TODO: Handle Error responses
pub fn send_rpc_response(
&mut self,
peer_id: PeerId,
@ -270,11 +344,7 @@ impl NetworkContext {
) {
self.send_rpc_event(
peer_id,
RPCEvent::Response {
id: request_id,
method_id: rpc_response.method_id(),
result: rpc_response,
},
RPCEvent::Response(request_id, RPCErrorResponse::Success(rpc_response)),
);
}
@ -291,7 +361,6 @@ impl NetworkContext {
"Could not send RPC message to the network service"
)
});
//
}
/// Returns the next `RequestId` for sending an `RPCRequest` to the `peer_id`.
@ -299,9 +368,9 @@ impl NetworkContext {
let next_id = self
.outgoing_request_ids
.entry(peer_id.clone())
.and_modify(RequestId::increment)
.or_insert_with(|| RequestId::from(1));
.and_modify(|id| *id += 1)
.or_insert_with(|| 0);
next_id.previous()
*next_id
}
}

14
beacon_node/network/src/service.rs
View File

@ -118,13 +118,19 @@ fn network_service(
trace!(log, "RPC Event: RPC message received: {:?}", rpc_event);
message_handler_send
.send(HandlerMessage::RPC(peer_id, rpc_event))
.map_err(|_| "failed to send rpc to handler")?;
.map_err(|_| "Failed to send rpc to handler")?;
}
Libp2pEvent::PeerDialed(peer_id) => {
debug!(log, "Peer Dialed: {:?}", peer_id);
message_handler_send
.send(HandlerMessage::PeerDialed(peer_id))
.map_err(|_| "failed to send rpc to handler")?;
.map_err(|_| "Failed to send PeerDialed to handler")?;
}
Libp2pEvent::PeerDisconnected(peer_id) => {
debug!(log, "Peer Disconnected: {:?}", peer_id);
message_handler_send
.send(HandlerMessage::PeerDisconnected(peer_id))
.map_err(|_| "Failed to send PeerDisconnected to handler")?;
}
Libp2pEvent::PubsubMessage {
source, message, ..
@ -176,7 +182,7 @@ fn network_service(
}
/// Types of messages that the network service can receive.
#[derive(Debug, Clone)]
#[derive(Debug)]
pub enum NetworkMessage {
/// Send a message to libp2p service.
//TODO: Define typing for messages across the wire
@ -189,7 +195,7 @@ pub enum NetworkMessage {
}
/// Type of outgoing messages that can be sent through the network service.
#[derive(Debug, Clone)]
#[derive(Debug)]
pub enum OutgoingMessage {
/// Send an RPC request/response.
RPC(RPCEvent),

40
beacon_node/network/src/sync/simple_sync.rs
View File

@ -5,6 +5,7 @@ use eth2_libp2p::rpc::methods::*;
use eth2_libp2p::rpc::{RPCRequest, RPCResponse, RequestId};
use eth2_libp2p::PeerId;
use slog::{debug, error, info, o, trace, warn};
use ssz::Encode;
use std::collections::HashMap;
use std::sync::Arc;
use std::time::Duration;
@ -30,6 +31,7 @@ const SHOULD_NOT_FORWARD_GOSSIP_BLOCK: bool = false;
#[derive(Clone, Copy, Debug)]
pub struct PeerSyncInfo {
network_id: u8,
chain_id: u64,
latest_finalized_root: Hash256,
latest_finalized_epoch: Epoch,
best_root: Hash256,
@ -40,6 +42,7 @@ impl From<HelloMessage> for PeerSyncInfo {
fn from(hello: HelloMessage) -> PeerSyncInfo {
PeerSyncInfo {
network_id: hello.network_id,
chain_id: hello.chain_id,
latest_finalized_root: hello.latest_finalized_root,
latest_finalized_epoch: hello.latest_finalized_epoch,
best_root: hello.best_root,
@ -107,6 +110,17 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
self.known_peers.remove(&peer_id);
}
/// Handle a peer disconnect.
///
/// Removes the peer from `known_peers`.
pub fn on_disconnect(&mut self, peer_id: PeerId) {
info!(
self.log, "Peer Disconnected";
"peer" => format!("{:?}", peer_id),
);
self.known_peers.remove(&peer_id);
}
/// Handle the connection of a new peer.
///
/// Sends a `Hello` message to the peer.
@ -200,7 +214,7 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
// If we have equal or better finalized epochs and best slots, we require nothing else from
// this peer.
//
// We make an exception when our best slot is 0. Best slot does not indicate wether or
// We make an exception when our best slot is 0. Best slot does not indicate whether or
// not there is a block at slot zero.
if (remote.latest_finalized_epoch <= local.latest_finalized_epoch)
&& (remote.best_slot <= local.best_slot)
@ -398,6 +412,13 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
})
.collect();
// ssz-encode the headers
//TODO: Make this more elegant
let headers = {
let resp = EncodeableBeaconBlockHeadersResponse { headers };
resp.as_ssz_bytes()
};
network.send_rpc_response(
peer_id,
request_id,
@ -409,7 +430,7 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
pub fn on_beacon_block_headers_response(
&mut self,
peer_id: PeerId,
res: BeaconBlockHeadersResponse,
res: EncodeableBeaconBlockHeadersResponse,
network: &mut NetworkContext,
) {
debug!(
@ -471,10 +492,19 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
"returned" => block_bodies.len(),
);
//TODO: Elegant ssz encoding. Either here or in the message handler
let bytes = {
let resp = EncodeableBeaconBlockBodiesResponse { block_bodies };
resp.as_ssz_bytes()
};
network.send_rpc_response(
peer_id,
request_id,
RPCResponse::BeaconBlockBodies(BeaconBlockBodiesResponse { block_bodies }),
RPCResponse::BeaconBlockBodies(BeaconBlockBodiesResponse {
block_bodies: bytes,
block_roots: None,
}),
)
}
@ -482,7 +512,7 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
pub fn on_beacon_block_bodies_response(
&mut self,
peer_id: PeerId,
res: BeaconBlockBodiesResponse,
res: DecodedBeaconBlockBodiesResponse,
network: &mut NetworkContext,
) {
debug!(
@ -802,7 +832,9 @@ fn hello_message<T: BeaconChainTypes>(beacon_chain: &BeaconChain<T>) -> HelloMes
let state = &beacon_chain.head().beacon_state;
HelloMessage {
//TODO: Correctly define the chain/network id
network_id: spec.chain_id,
chain_id: spec.chain_id as u64,
latest_finalized_root: state.finalized_root,
latest_finalized_epoch: state.finalized_epoch,
best_root: beacon_chain.head().beacon_block_root,