2019-03-21 00:02:52 +00:00
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use super::methods::*;
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2019-03-17 03:38:20 +00:00
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use libp2p::core::{upgrade, InboundUpgrade, OutboundUpgrade, UpgradeInfo};
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2019-07-05 08:59:53 +00:00
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use ssz::{Decode, Encode};
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use std::hash::Hasher;
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2019-03-14 14:50:59 +00:00
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use std::io;
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use std::iter;
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use tokio::io::{AsyncRead, AsyncWrite};
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/// The maximum bytes that can be sent across the RPC.
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2019-07-05 08:59:53 +00:00
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const MAX_RPC_SIZE: usize = 4_194_304; // 4M
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/// The protocol prefix the RPC protocol id.
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const PROTOCOL_PREFIX: &str = "/eth/serenity/rpc/";
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2019-03-14 14:50:59 +00:00
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/// Implementation of the `ConnectionUpgrade` for the rpc protocol.
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#[derive(Debug, Clone)]
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pub struct RPCProtocol;
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impl UpgradeInfo for RPCProtocol {
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type Info = &'static [u8];
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2019-07-05 08:59:53 +00:00
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type InfoIter = Vec<Self::Info>;
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2019-03-14 14:50:59 +00:00
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fn protocol_info(&self) -> Self::InfoIter {
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2019-07-05 08:59:53 +00:00
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vec![
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b"/eth/serenity/rpc/hello/1/ssz",
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b"/eth/serenity/rpc/goodbye/1/ssz",
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b"/eth/serenity/rpc/beacon_block_roots/1/ssz",
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b"/eth/serenity/rpc/beacon_block_headers/1/ssz",
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b"/eth/serenity/rpc/beacon_block_bodies/1/ssz",
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b"/eth/serenity/rpc/beacon_chain_state/1/ssz",
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]
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2019-03-14 14:50:59 +00:00
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}
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}
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2019-07-05 08:59:53 +00:00
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/* Inbound upgrade */
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2019-03-25 05:48:44 +00:00
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2019-07-04 04:05:01 +00:00
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// The inbound protocol reads the request, decodes it and returns the stream to the protocol
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// handler to respond to once ready.
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2019-04-03 05:23:09 +00:00
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2019-07-05 08:59:53 +00:00
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type FnDecodeRPCEvent<TSocket> = fn(
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upgrade::Negotiated<TSocket>,
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Vec<u8>,
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(),
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) -> Result<(upgrade::Negotiated<TSocket>, RPCEvent), RPCError>;
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2019-03-25 05:48:44 +00:00
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2019-07-04 04:05:01 +00:00
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impl<TSocket> InboundUpgrade<TSocket> for RPCProtocol
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where
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TSocket: AsyncRead + AsyncWrite,
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{
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2019-07-05 08:59:53 +00:00
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type Output = (upgrade::Negotiated<TSocket>, RPCEvent);
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type Error = RPCError;
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type Future = upgrade::ReadRespond<upgrade::Negotiated<TSocket>, (), FnDecodeRPCEvent<TSocket>>;
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fn upgrade_inbound(
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self,
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socket: upgrade::Negotiated<TSocket>,
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protocol: Self::Info,
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) -> Self::Future {
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upgrade::read_respond(socket, MAX_RPC_SIZE, (), |socket, packet, ()| {
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Ok((socket, decode_request(packet, protocol)?))
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})
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2019-03-14 14:50:59 +00:00
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}
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}
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2019-07-05 08:59:53 +00:00
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/* Outbound request */
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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// Combines all the RPC requests into a single enum to implement `UpgradeInfo` and
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// `OutboundUpgrade`
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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/// The raw protocol id sent over the wire.
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type RawProtocolId = Vec<u8>;
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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/// Tracks the types in a protocol id.
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pub struct ProtocolId {
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/// The rpc message type/name.
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pub message_name: String,
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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/// The version of the RPC.
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pub version: usize,
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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/// The encoding of the RPC.
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pub encoding: String,
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}
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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/// An RPC protocol ID.
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impl ProtocolId {
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pub fn new(message_name: String, version: usize, encoding: String) -> Self {
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ProtocolId {
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message_name,
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version,
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encoding,
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}
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}
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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/// Converts a raw RPC protocol id string into an `RPCProtocolId`
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pub fn from_bytes(bytes: Vec<u8>) -> Result<Self, RPCError> {
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let protocol_string = String::from_utf8(bytes.as_vec())
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.map_err(|_| RPCError::InvalidProtocol("Invalid protocol Id"))?;
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let protocol_string = protocol_string.as_str().split('/');
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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Ok(ProtocolId {
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message_name: protocol_string[3],
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version: protocol_string[4],
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encoding: protocol_string[5],
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})
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}
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}
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2019-04-03 05:23:09 +00:00
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2019-07-05 08:59:53 +00:00
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impl Into<RawProtocolId> for ProtocolId {
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fn into(&self) -> [u8] {
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&format!(
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"{}/{}/{}/{}",
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PROTOCOL_PREFIX, self.message_name, self.version, self.encoding
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)
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.as_bytes()
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}
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}
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2019-03-14 14:50:59 +00:00
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2019-07-05 08:59:53 +00:00
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#[derive(Debug, Clone)]
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pub enum RPCRequest {
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Hello(HelloMessage),
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Goodbye(Goodbye),
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BeaconBlockRoots(BeaconBlockRootsRequest),
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BeaconBlockHeaders(BeaconBlockHeadersRequest),
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BeaconBlockBodies(BeaconBlockBodiesRequest),
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BeaconChainState(BeaconChainStateRequest),
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}
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2019-03-14 14:50:59 +00:00
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2019-07-05 08:59:53 +00:00
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impl UpgradeInfo for RPCRequest {
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type Info = RawProtocolId;
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type InfoIter = Vec<Self::Info>;
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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// add further protocols as we support more encodings/versions
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fn protocol_info(&self) -> Self::InfoIter {
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self.supported_protocols()
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}
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}
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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// GOODBYE RPC has it's own upgrade as it doesn't expect a response
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impl UpgradeInfo for Goodbye {
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type Info = RawProtocolId;
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type InfoIter = iter::Once<Self::Info>;
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2019-07-04 04:05:01 +00:00
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2019-07-05 08:59:53 +00:00
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// add further protocols as we support more encodings/versions
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fn protocol_info(&self) -> Self::InfoIter {
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iter::once(ProtocolId::new("goodbye", 1, "ssz").into())
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}
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2019-06-06 13:47:21 +00:00
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}
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2019-07-05 08:59:53 +00:00
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/// Implements the encoding per supported protocol for RPCRequest.
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impl RPCRequest {
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pub fn supported_protocols(&self) -> Vec<RawProtocolId> {
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match self {
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// add more protocols when versions/encodings are supported
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RPCRequest::Hello(_) => vec![ProtocolId::new("hello", 1, "ssz").into()],
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RPCRequest::Goodbye(_) => vec![ProtocolId::new("goodbye", 1, "ssz").into()],
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RPCRequest::BeaconBlockRoots(_) => {
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vec![ProtocolId::new("beacon_block_roots", 1, "ssz").into()]
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2019-03-21 00:05:26 +00:00
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}
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2019-07-05 08:59:53 +00:00
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RPCRequest::BeaconBlockHeaders(_) => {
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vec![ProtocolId::new("beacon_block_headers", 1, "ssz").into()]
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2019-03-21 00:16:09 +00:00
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}
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2019-07-05 08:59:53 +00:00
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RPCRequest::BeaconBlockBodies(_) => {
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vec![ProtocolId::new("beacon_block_bodies", 1, "ssz").into()]
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2019-03-21 00:18:47 +00:00
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}
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2019-07-05 08:59:53 +00:00
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RPCRequest::BeaconBlockState(_) => {
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vec![ProtocolId::new("beacon_block_state", 1, "ssz").into()]
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2019-03-21 00:16:09 +00:00
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}
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2019-07-05 08:59:53 +00:00
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}
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}
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/// Encodes the Request object based on the negotiated protocol.
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pub fn encode(&self, protocol: RawProtocolId) -> Result<Vec<u8>, io::Error> {
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// Assume select has given a supported protocol.
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let protocol = ProtocolId::from_bytes(protocol)?;
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// Match on the encoding and in the future, the version
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match protocol.encoding {
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"ssz" => Ok(self.ssz_encode()),
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_ => {
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return Err(RPCError::Custom(format!(
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"Unknown Encoding: {}",
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protocol.encoding
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)))
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2019-03-21 00:18:47 +00:00
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}
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2019-07-05 08:59:53 +00:00
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}
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}
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fn ssz_encode(&self) {
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match self {
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RPCRequest::Hello(req) => req.as_ssz_bytes(),
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RPCRequest::Goodbye(req) => req.as_ssz_bytes(),
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RPCRequest::BeaconBlockRoots(req) => req.as_ssz_bytes(),
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RPCRequest::BeaconBlockHeaders(req) => req.as_ssz_bytes(),
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RPCRequest::BeaconBlockBodies(req) => req.as_ssz_bytes(),
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RPCRequest::BeaconChainState(req) => req.as_ssz_bytes(),
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}
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}
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}
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/* Outbound upgrades */
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impl<TSocket> OutboundUpgrade<TSocket> for RPCRequest
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where
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TSocket: AsyncWrite,
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{
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2019-07-06 11:32:32 +00:00
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type Output = RPCResponse;
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type Error = RPCResponse;
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type Future = upgrade::RequestResponse<upgrade::Negotiated<TSocket>>;
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2019-07-05 08:59:53 +00:00
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fn upgrade_outbound(
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self,
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socket: upgrade::Negotiated<TSocket>,
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protocol: Self::Info,
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) -> Self::Future {
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let bytes = self.encode(protocol);
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2019-07-06 11:32:32 +00:00
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wait_for_response = if let RPCRequest::Goodbye(_) = self {
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false
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} else {
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true
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};
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// TODO: Reimplement request_response
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2019-07-05 08:59:53 +00:00
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upgrade::request_response(socket, bytes, MAX_RPC_SIZE, protocol, |packet, protocol| {
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Ok(decode_response(packet, protocol)?)
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2019-03-19 12:20:39 +00:00
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})
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2019-03-14 14:50:59 +00:00
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}
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}
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2019-07-05 08:59:53 +00:00
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impl<TSocket> OutboundUpgrade<TSocket> for Goodbye
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where
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TSocket: AsyncWrite,
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{
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type Output = ();
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type Error = io::Error;
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type Future = upgrade::WriteOne<upgrade::Negotiated<TSocket>>;
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2019-03-14 14:50:59 +00:00
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2019-07-05 08:59:53 +00:00
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fn upgrade_outbound(
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self,
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socket: upgrade::Negotiated<TSocket>,
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protocol: Self::Info,
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) -> Self::Future {
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let bytes = self.as_ssz_bytes();
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upgrade::write_one(socket, bytes)
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2019-05-13 02:07:32 +00:00
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}
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2019-07-05 08:59:53 +00:00
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}
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/* Decoding for Requests/Responses */
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// This function can be extended to provide further logic for supporting various protocol versions/encoding
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fn decode_request(packet: Vec<u8>, protocol: ProtocolId) -> Result<RPCRequest, io::Error> {
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let protocol_id = ProtocolId::from_bytes(protocol);
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2019-05-13 02:07:32 +00:00
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2019-07-05 08:59:53 +00:00
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match protocol_id.message_name {
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"hello" => match protocol_id.version {
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"1" => match protocol_id.encoding {
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"ssz" => Ok(RPCRequest::Hello(HelloMessage::from_ssz_bytes(&packet)?)),
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_ => Err(RPCError::InvalidProtocol("Unknown HELLO encoding")),
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},
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_ => Err(RPCError::InvalidProtocol("Unknown HELLO version")),
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},
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"goodbye" => match protocol_id.version {
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"1" => match protocol_id.encoding {
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"ssz" => Ok(RPCRequest::Goodbye(Goodbye::from_ssz_bytes(&packet)?)),
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_ => Err(RPCError::InvalidProtocol("Unknown GOODBYE encoding")),
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},
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_ => Err(RPCError::InvalidProtocol("Unknown GOODBYE version")),
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},
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"beacon_block_roots" => match protocol_id.version {
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"1" => match protocol_id.encoding {
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"ssz" => Ok(RPCRequest::BeaconBlockRooots(
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BeaconBlockRootsRequest::from_ssz_bytes(&packet)?,
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)),
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_ => Err(RPCError::InvalidProtocol(
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"Unknown BEACON_BLOCK_ROOTS encoding",
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)),
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2019-06-06 13:47:21 +00:00
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},
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2019-07-05 08:59:53 +00:00
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_ => Err(RPCError::InvalidProtocol(
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"Unknown BEACON_BLOCK_ROOTS version",
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)),
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},
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"beacon_block_headers" => match protocol_id.version {
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"1" => match protocol_id.encoding {
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"ssz" => Ok(RPCRequest::BeaconBlockHeaders(
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BeaconBlockHeadersRequest::from_ssz_bytes(&packet),
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)),
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_ => Err(RPCError::InvalidProtocol(
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"Unknown BEACON_BLOCK_HEADERS encoding",
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)),
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2019-06-06 13:47:21 +00:00
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},
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2019-07-05 08:59:53 +00:00
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_ => Err(RPCError::InvalidProtocol(
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"Unknown BEACON_BLOCK_HEADERS version",
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)),
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},
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"beacon_block_bodies" => match protocol_id.version {
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"1" => match protocol_id.encoding {
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"ssz" => Ok(RPCRequest::BeaconBlockBodies(
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BeaconBlockBodiesRequest::from_ssz_bytes(&packet)?,
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)),
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_ => Err(RPCError::InvalidProtocol(
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"Unknown BEACON_BLOCK_BODIES encoding",
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)),
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},
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_ => Err(RPCError::InvalidProtocol(
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"Unknown BEACON_BLOCK_BODIES version",
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)),
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},
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"beacon_chain_state" => match protocol_id.version {
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"1" => match protocol_id.encoding {
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"ssz" => Ok(RPCRequest::BeaconChainState(
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BeaconChainStateRequest::from_ssz_bytes(&packet)?,
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)),
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_ => Err(RPCError::InvalidProtocol(
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"Unknown BEACON_CHAIN_STATE encoding",
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)),
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},
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_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_CHAIN_STATE version",
|
|
|
|
)),
|
|
|
|
},
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Decodes a response that was received on the same stream as a request. The response type should
|
|
|
|
/// therefore match the request protocol type.
|
|
|
|
fn decode_response(packet: Vec<u8>, protocol: RawProtocolId) -> Result<RPCResponse, RPCError> {
|
|
|
|
let protocol_id = ProtocolId::from_bytes(protocol)?;
|
2019-05-13 02:07:32 +00:00
|
|
|
|
2019-07-05 08:59:53 +00:00
|
|
|
match protocol_id.message_name {
|
|
|
|
"hello" => match protocol_id.version {
|
|
|
|
"1" => match protocol_id.encoding {
|
|
|
|
"ssz" => Ok(RPCResponse::Hello(HelloMessage::from_ssz_bytes(&packet)?)),
|
|
|
|
_ => Err(RPCError::InvalidProtocol("Unknown HELLO encoding")),
|
|
|
|
},
|
|
|
|
_ => Err(RPCError::InvalidProtocol("Unknown HELLO version")),
|
|
|
|
},
|
|
|
|
"goodbye" => Err(RPCError::Custom("GOODBYE should not have a response")),
|
|
|
|
"beacon_block_roots" => match protocol_id.version {
|
|
|
|
"1" => match protocol_id.encoding {
|
|
|
|
"ssz" => Ok(RPCResponse::BeaconBlockRoots(
|
|
|
|
BeaconBlockRootsResponse::from_ssz_bytes(&packet)?,
|
|
|
|
)),
|
|
|
|
_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_BLOCK_ROOTS encoding",
|
|
|
|
)),
|
|
|
|
},
|
|
|
|
_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_BLOCK_ROOTS version",
|
|
|
|
)),
|
|
|
|
},
|
|
|
|
"beacon_block_headers" => match protocol_id.version {
|
|
|
|
"1" => match protocol_id.encoding {
|
|
|
|
"ssz" => Ok(RPCResponse::BeaconBlockHeaders(
|
|
|
|
BeaconBlockHeadersResponse { headers: packet },
|
|
|
|
)),
|
|
|
|
_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_BLOCK_HEADERS encoding",
|
|
|
|
)),
|
|
|
|
},
|
|
|
|
_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_BLOCK_HEADERS version",
|
|
|
|
)),
|
|
|
|
},
|
|
|
|
"beacon_block_bodies" => match protocol_id.version {
|
|
|
|
"1" => match protocol_id.encoding {
|
|
|
|
"ssz" => Ok(RPCResponse::BeaconBlockBodies(BeaconBlockBodiesResponse {
|
|
|
|
block_bodies: packet,
|
|
|
|
})),
|
|
|
|
_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_BLOCK_BODIES encoding",
|
|
|
|
)),
|
|
|
|
},
|
|
|
|
_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_BLOCK_BODIES version",
|
|
|
|
)),
|
|
|
|
},
|
|
|
|
"beacon_chain_state" => match protocol_id.version {
|
|
|
|
"1" => match protocol_id.encoding {
|
|
|
|
"ssz" => Ok(BeaconChainStateRequest::from_ssz_bytes(&packet)?),
|
|
|
|
_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_CHAIN_STATE encoding",
|
|
|
|
)),
|
|
|
|
},
|
|
|
|
_ => Err(RPCError::InvalidProtocol(
|
|
|
|
"Unknown BEACON_CHAIN_STATE version",
|
|
|
|
)),
|
|
|
|
},
|
2019-03-14 14:50:59 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-07-05 08:59:53 +00:00
|
|
|
/// Error in RPC Encoding/Decoding.
|
2019-03-14 15:48:09 +00:00
|
|
|
#[derive(Debug)]
|
2019-07-05 08:59:53 +00:00
|
|
|
pub enum RPCError {
|
|
|
|
/// Error when reading the packet from the socket.
|
2019-03-14 14:50:59 +00:00
|
|
|
ReadError(upgrade::ReadOneError),
|
2019-07-05 08:59:53 +00:00
|
|
|
/// Error when decoding the raw buffer from ssz.
|
2019-03-14 14:50:59 +00:00
|
|
|
SSZDecodeError(ssz::DecodeError),
|
2019-07-05 08:59:53 +00:00
|
|
|
/// Invalid Protocol ID
|
|
|
|
InvalidProtocol(&'static str),
|
|
|
|
/// Custom message.
|
|
|
|
Custom(String),
|
2019-03-14 14:50:59 +00:00
|
|
|
}
|
|
|
|
|
2019-07-05 08:59:53 +00:00
|
|
|
impl From<upgrade::ReadOneError> for RPCError {
|
2019-03-14 14:50:59 +00:00
|
|
|
#[inline]
|
|
|
|
fn from(err: upgrade::ReadOneError) -> Self {
|
2019-07-05 08:59:53 +00:00
|
|
|
RPCError::ReadError(err)
|
2019-03-14 14:50:59 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-07-05 08:59:53 +00:00
|
|
|
impl From<ssz::DecodeError> for RPCError {
|
2019-03-14 14:50:59 +00:00
|
|
|
#[inline]
|
|
|
|
fn from(err: ssz::DecodeError) -> Self {
|
2019-07-05 08:59:53 +00:00
|
|
|
RPCError::SSZDecodeError(err)
|
2019-03-14 14:50:59 +00:00
|
|
|
}
|
|
|
|
}
|