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Merge pull request #3796 from ethcore/tx-broadcast 

Avoid broadcasting transactions to peers that send them
This commit is contained in:
Gav Wood 2016-12-12 04:13:56 +01:00 committed by GitHub
parent 2844a4e85e 83d9bc189b
commit c0a2d5c8f5
15 changed files with 119 additions and 72 deletions
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30
ethcore/light/src/net/context.rs
View File

@ -16,13 +16,13 @@
//! I/O and event context generalizations.
use network::{NetworkContext, PeerId};
use network::{NetworkContext, PeerId, NodeId};
use super::{Announcement, LightProtocol, ReqId};
use super::error::Error;
use request::Request;
/// An I/O context which allows sending and receiving packets as well as
/// An I/O context which allows sending and receiving packets as well as
/// disconnecting peers. This is used as a generalization of the portions
/// of a p2p network which the light protocol structure makes use of.
pub trait IoContext {
@ -41,8 +41,12 @@ pub trait IoContext {
/// Get a peer's protocol version.
fn protocol_version(&self, peer: PeerId) -> Option<u8>;
/// Persistent peer id
fn persistent_peer_id(&self, peer: PeerId) -> Option<NodeId>;
}
impl<'a> IoContext for NetworkContext<'a> {
fn send(&self, peer: PeerId, packet_id: u8, packet_body: Vec<u8>) {
if let Err(e) = self.send(peer, packet_id, packet_body) {
@ -67,6 +71,10 @@ impl<'a> IoContext for NetworkContext<'a> {
fn protocol_version(&self, peer: PeerId) -> Option<u8> {
self.protocol_version(self.subprotocol_name(), peer)
}
fn persistent_peer_id(&self, peer: PeerId) -> Option<NodeId> {
self.session_info(peer).and_then(|info| info.id)
}
}
/// Context for a protocol event.
@ -75,6 +83,9 @@ pub trait EventContext {
/// disconnected/connected peer.
fn peer(&self) -> PeerId;
/// Returns the relevant's peer persistent Id (aka NodeId).
fn persistent_peer_id(&self, peer: PeerId) -> Option<NodeId>;
/// Make a request from a peer.
fn request_from(&self, peer: PeerId, request: Request) -> Result<ReqId, Error>;
@ -89,7 +100,7 @@ pub trait EventContext {
fn disable_peer(&self, peer: PeerId);
}
/// Concrete implementation of `EventContext` over the light protocol struct and
/// Concrete implementation of `EventContext` over the light protocol struct and
/// an io context.
pub struct Ctx<'a> {
/// Io context to enable immediate response to events.
@ -97,11 +108,18 @@ pub struct Ctx<'a> {
/// Protocol implementation.
pub proto: &'a LightProtocol,
/// Relevant peer for event.
pub peer: PeerId,
pub peer: PeerId,
}
impl<'a> EventContext for Ctx<'a> {
fn peer(&self) -> PeerId { self.peer }
fn peer(&self) -> PeerId {
self.peer
}
fn persistent_peer_id(&self, id: PeerId) -> Option<NodeId> {
self.io.persistent_peer_id(id)
}
fn request_from(&self, peer: PeerId, request: Request) -> Result<ReqId, Error> {
self.proto.request_from(self.io, &peer, request)
}
@ -117,4 +135,4 @@ impl<'a> EventContext for Ctx<'a> {
fn disable_peer(&self, peer: PeerId) {
self.io.disable_peer(peer);
}
}
}

86
ethcore/light/src/net/tests/mod.rs
View File

@ -15,13 +15,13 @@
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! Tests for the `LightProtocol` implementation.
//! These don't test of the higher level logic on top of
//! These don't test of the higher level logic on top of
use ethcore::blockchain_info::BlockChainInfo;
use ethcore::client::{BlockChainClient, EachBlockWith, TestBlockChainClient};
use ethcore::ids::BlockId;
use ethcore::transaction::SignedTransaction;
use network::PeerId;
use network::{PeerId, NodeId};
use net::buffer_flow::FlowParams;
use net::context::IoContext;
@ -68,6 +68,10 @@ impl IoContext for Expect {
fn protocol_version(&self, _peer: PeerId) -> Option<u8> {
Some(super::MAX_PROTOCOL_VERSION)
}
fn persistent_peer_id(&self, _peer: PeerId) -> Option<NodeId> {
None
}
}
// can't implement directly for Arc due to cross-crate orphan rules.
@ -117,7 +121,7 @@ impl Provider for TestProvider {
.map(|x: u64| x.saturating_mul(req.skip + 1))
.take_while(|x| if req.reverse { x < &start_num } else { best_num - start_num >= *x })
.map(|x| if req.reverse { start_num - x } else { start_num + x })
.map(|x| self.0.client.block_header(BlockId::Number(x)))
.map(|x| self.0.client.block_header(BlockId::Number(x)))
.take_while(|x| x.is_some())
.flat_map(|x| x)
.collect()
@ -150,12 +154,12 @@ impl Provider for TestProvider {
}
}
})
.collect()
.collect()
}
fn contract_code(&self, req: request::ContractCodes) -> Vec<Bytes> {
req.code_requests.into_iter()
.map(|req| {
.map(|req| {
req.account_key.iter().chain(req.account_key.iter()).cloned().collect()
})
.collect()
@ -213,9 +217,9 @@ fn status(chain_info: BlockChainInfo) -> Status {
#[test]
fn handshake_expected() {
let flow_params = make_flow_params();
let capabilities = capabilities();
let capabilities = capabilities();
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let status = status(provider.client.chain_info());
@ -228,9 +232,9 @@ fn handshake_expected() {
#[should_panic]
fn genesis_mismatch() {
let flow_params = make_flow_params();
let capabilities = capabilities();
let capabilities = capabilities();
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let mut status = status(provider.client.chain_info());
status.genesis_hash = H256::default();
@ -243,15 +247,15 @@ fn genesis_mismatch() {
#[test]
fn buffer_overflow() {
let flow_params = make_flow_params();
let capabilities = capabilities();
let capabilities = capabilities();
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let status = status(provider.client.chain_info());
{
let packet_body = write_handshake(&status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
let packet_body = write_handshake(&status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
}
{
@ -276,9 +280,9 @@ fn buffer_overflow() {
#[test]
fn get_block_headers() {
let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
let capabilities = capabilities();
let capabilities = capabilities();
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let cur_status = status(provider.client.chain_info());
let my_status = write_handshake(&cur_status, &capabilities, Some(&flow_params));
@ -288,8 +292,8 @@ fn get_block_headers() {
let cur_status = status(provider.client.chain_info());
{
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &my_status);
}
@ -309,7 +313,7 @@ fn get_block_headers() {
let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::Headers, 10);
let mut response_stream = RlpStream::new_list(3);
response_stream.append(&req_id).append(&new_buf).begin_list(10);
for header in headers {
response_stream.append_raw(&header, 1);
@ -325,9 +329,9 @@ fn get_block_headers() {
#[test]
fn get_block_bodies() {
let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
let capabilities = capabilities();
let capabilities = capabilities();
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let cur_status = status(provider.client.chain_info());
let my_status = write_handshake(&cur_status, &capabilities, Some(&flow_params));
@ -337,8 +341,8 @@ fn get_block_bodies() {
let cur_status = status(provider.client.chain_info());
{
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &my_status);
}
@ -356,7 +360,7 @@ fn get_block_bodies() {
let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::Bodies, 10);
let mut response_stream = RlpStream::new_list(3);
response_stream.append(&req_id).append(&new_buf).begin_list(10);
for body in bodies {
response_stream.append_raw(&body, 1);
@ -372,9 +376,9 @@ fn get_block_bodies() {
#[test]
fn get_block_receipts() {
let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
let capabilities = capabilities();
let capabilities = capabilities();
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let cur_status = status(provider.client.chain_info());
let my_status = write_handshake(&cur_status, &capabilities, Some(&flow_params));
@ -384,8 +388,8 @@ fn get_block_receipts() {
let cur_status = status(provider.client.chain_info());
{
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body));
proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &my_status);
}
@ -409,7 +413,7 @@ fn get_block_receipts() {
let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::Receipts, receipts.len());
let mut response_stream = RlpStream::new_list(3);
response_stream.append(&req_id).append(&new_buf).begin_list(receipts.len());
for block_receipts in receipts {
response_stream.append_raw(&block_receipts, 1);
@ -425,15 +429,15 @@ fn get_block_receipts() {
#[test]
fn get_state_proofs() {
let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
let capabilities = capabilities();
let capabilities = capabilities();
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let cur_status = status(provider.client.chain_info());
{
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body.clone()));
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body.clone()));
proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &packet_body);
}
@ -441,7 +445,7 @@ fn get_state_proofs() {
let key1 = U256::from(11223344).into();
let key2 = U256::from(99988887).into();
let request = Request::StateProofs (request::StateProofs {
let request = Request::StateProofs (request::StateProofs {
requests: vec![
request::StateProof { block: H256::default(), key1: key1, key2: None, from_level: 0 },
request::StateProof { block: H256::default(), key1: key1, key2: Some(key2), from_level: 0},
@ -458,7 +462,7 @@ fn get_state_proofs() {
let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::StateProofs, 2);
let mut response_stream = RlpStream::new_list(3);
response_stream.append(&req_id).append(&new_buf).begin_list(2);
for proof in proofs {
response_stream.append_raw(&proof, 1);
@ -474,15 +478,15 @@ fn get_state_proofs() {
#[test]
fn get_contract_code() {
let flow_params = FlowParams::new(5_000_000.into(), Default::default(), 0.into());
let capabilities = capabilities();
let capabilities = capabilities();
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let (provider, proto) = setup(flow_params.clone(), capabilities.clone());
let cur_status = status(provider.client.chain_info());
{
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body.clone()));
let packet_body = write_handshake(&cur_status, &capabilities, Some(&flow_params));
proto.on_connect(&1, &Expect::Send(1, packet::STATUS, packet_body.clone()));
proto.handle_packet(&Expect::Nothing, &1, packet::STATUS, &packet_body);
}
@ -490,7 +494,7 @@ fn get_contract_code() {
let key1 = U256::from(11223344).into();
let key2 = U256::from(99988887).into();
let request = Request::Codes (request::ContractCodes {
let request = Request::Codes (request::ContractCodes {
code_requests: vec![
request::ContractCode { block_hash: H256::default(), account_key: key1 },
request::ContractCode { block_hash: H256::default(), account_key: key2 },
@ -507,7 +511,7 @@ fn get_contract_code() {
let new_buf = *flow_params.limit() - flow_params.compute_cost(request::Kind::Codes, 2);
let mut response_stream = RlpStream::new_list(3);
response_stream.append(&req_id).append(&new_buf).begin_list(2);
for code in codes {
response_stream.append(&code);
@ -518,4 +522,4 @@ fn get_contract_code() {
let expected = Expect::Respond(packet::CONTRACT_CODES, response);
proto.handle_packet(&expected, &1, packet::GET_CONTRACT_CODES, &request_body);
}
}

8
ethcore/src/client/chain_notify.rs
View File

@ -40,6 +40,14 @@ pub trait ChainNotify : Send + Sync {
fn stop(&self) {
// does nothing by default
}
/// fires when new transactions are received from a peer
fn transactions_received(&self,
_hashes: Vec<H256>,
_peer_id: usize,
) {
// does nothing by default
}
}
impl IpcConfig for ChainNotify { }

12
ethcore/src/client/client.rs
View File

@ -559,11 +559,15 @@ impl Client {
}
/// Import transactions from the IO queue
pub fn import_queued_transactions(&self, transactions: &[Bytes]) -> usize {
pub fn import_queued_transactions(&self, transactions: &[Bytes], peer_id: usize) -> usize {
trace!(target: "external_tx", "Importing queued");
let _timer = PerfTimer::new("import_queued_transactions");
self.queue_transactions.fetch_sub(transactions.len(), AtomicOrdering::SeqCst);
let txs = transactions.iter().filter_map(|bytes| UntrustedRlp::new(bytes).as_val().ok()).collect();
let txs: Vec<SignedTransaction> = transactions.iter().filter_map(|bytes| UntrustedRlp::new(bytes).as_val().ok()).collect();
let hashes: Vec<_> = txs.iter().map(|tx| tx.hash()).collect();
self.notify(|notify| {
notify.transactions_received(hashes.clone(), peer_id);
});
let results = self.miner.import_external_transactions(self, txs);
results.len()
}
@ -1264,14 +1268,14 @@ impl BlockChainClient for Client {
(*self.build_last_hashes(self.chain.read().best_block_hash())).clone()
}
fn queue_transactions(&self, transactions: Vec<Bytes>) {
fn queue_transactions(&self, transactions: Vec<Bytes>, peer_id: usize) {
let queue_size = self.queue_transactions.load(AtomicOrdering::Relaxed);
trace!(target: "external_tx", "Queue size: {}", queue_size);
if queue_size > MAX_TX_QUEUE_SIZE {
debug!("Ignoring {} transactions: queue is full", transactions.len());
} else {
let len = transactions.len();
match self.io_channel.lock().send(ClientIoMessage::NewTransactions(transactions)) {
match self.io_channel.lock().send(ClientIoMessage::NewTransactions(transactions, peer_id)) {
Ok(_) => {
self.queue_transactions.fetch_add(len, AtomicOrdering::SeqCst);
}

2
ethcore/src/client/test_client.rs
View File

@ -657,7 +657,7 @@ impl BlockChainClient for TestBlockChainClient {
unimplemented!();
}
fn queue_transactions(&self, transactions: Vec<Bytes>) {
fn queue_transactions(&self, transactions: Vec<Bytes>, _peer_id: usize) {
// import right here
let txs = transactions.into_iter().filter_map(|bytes| UntrustedRlp::new(&bytes).as_val().ok()).collect();
self.miner.import_external_transactions(self, txs);

6
ethcore/src/client/traits.rs
View File

@ -200,7 +200,7 @@ pub trait BlockChainClient : Sync + Send {
fn last_hashes(&self) -> LastHashes;
/// Queue transactions for importing.
fn queue_transactions(&self, transactions: Vec<Bytes>);
fn queue_transactions(&self, transactions: Vec<Bytes>, peer_id: usize);
/// list all transactions
fn pending_transactions(&self) -> Vec<SignedTransaction>;
@ -294,9 +294,9 @@ pub trait ProvingBlockChainClient: BlockChainClient {
/// The key is the keccak hash of the account's address.
/// Returns a vector of raw trie nodes (in order from the root) proving the query.
/// Nodes after `from_level` may be omitted.
/// An empty vector indicates unservable query.
/// An empty vector indicates unservable query.
fn prove_account(&self, key1: H256, from_level: u32, id: BlockId) -> Vec<Bytes>;
/// Get code by address hash.
fn code_by_hash(&self, account_key: H256, id: BlockId) -> Bytes;
}
}

6
ethcore/src/service.rs
View File

@ -39,7 +39,7 @@ pub enum ClientIoMessage {
/// A block is ready
BlockVerified,
/// New transaction RLPs are ready to be imported
NewTransactions(Vec<Bytes>),
NewTransactions(Vec<Bytes>, usize),
/// Begin snapshot restoration
BeginRestoration(ManifestData),
/// Feed a state chunk to the snapshot service
@ -196,7 +196,9 @@ impl IoHandler<ClientIoMessage> for ClientIoHandler {
match *net_message {
ClientIoMessage::BlockVerified => { self.client.import_verified_blocks(); }
ClientIoMessage::NewTransactions(ref transactions) => { self.client.import_queued_transactions(transactions); }
ClientIoMessage::NewTransactions(ref transactions, peer_id) => {
self.client.import_queued_transactions(transactions, peer_id);
}
ClientIoMessage::BeginRestoration(ref manifest) => {
if let Err(e) = self.snapshot.init_restore(manifest.clone(), true) {
warn!("Failed to initialize snapshot restoration: {}", e);

1
js/src/dapps/localtx/Transaction/transaction.js
View File

@ -48,7 +48,6 @@ class BaseTransaction extends Component {
<IdentityIcon
address={ transaction.from }
/>
0x{ transaction.nonce.toString(16) }
</div>
);
}

2
js/src/dapps/localtx/Transaction/transaction.spec.js
View File

@ -34,7 +34,7 @@ describe('dapps/localtx/Transaction', () => {
it('renders without crashing', () => {
const transaction = {
hash: '0x1234567890',
nonce: 15,
nonce: new BigNumber(15),
gasPrice: new BigNumber(10),
gas: new BigNumber(10)
};

4
rpc/src/v1/tests/helpers/sync_provider.rs
View File

@ -105,13 +105,13 @@ impl SyncProvider for TestSyncProvider {
first_seen: 10,
propagated_to: map![
128.into() => 16
]
],
},
5.into() => TransactionStats {
first_seen: 16,
propagated_to: map![
16.into() => 1
]
],
}
]
}

4
rpc/src/v1/types/sync.rs
View File

@ -157,7 +157,7 @@ impl From<SyncTransactionStats> for TransactionStats {
propagated_to: s.propagated_to
.into_iter()
.map(|(id, count)| (id.into(), count))
.collect()
.collect(),
}
}
}
@ -208,7 +208,7 @@ mod tests {
first_seen: 100,
propagated_to: map![
10.into() => 50
]
],
};
let serialized = serde_json::to_string(&stats).unwrap();

17
sync/src/api.rs
View File

@ -144,7 +144,7 @@ pub struct EthSync {
network: NetworkService,
/// Main (eth/par) protocol handler
sync_handler: Arc<SyncProtocolHandler>,
/// Light (les) protocol handler
/// Light (les) protocol handler
light_proto: Option<Arc<LightProtocol>>,
/// The main subprotocol name
subprotocol_name: [u8; 3],
@ -155,7 +155,7 @@ pub struct EthSync {
impl EthSync {
/// Creates and register protocol with the network service
pub fn new(params: Params) -> Result<Arc<EthSync>, NetworkError> {
let pruning_info = params.chain.pruning_info();
let pruning_info = params.chain.pruning_info();
let light_proto = match params.config.serve_light {
false => None,
true => Some({
@ -297,7 +297,7 @@ impl ChainNotify for EthSync {
Some(lp) => lp,
None => return,
};
let chain_info = self.sync_handler.chain.chain_info();
light_proto.make_announcement(context, Announcement {
head_hash: chain_info.best_block_hash,
@ -323,7 +323,7 @@ impl ChainNotify for EthSync {
// register the warp sync subprotocol
self.network.register_protocol(self.sync_handler.clone(), WARP_SYNC_PROTOCOL_ID, SNAPSHOT_SYNC_PACKET_COUNT, &[1u8])
.unwrap_or_else(|e| warn!("Error registering snapshot sync protocol: {:?}", e));
// register the light protocol.
if let Some(light_proto) = self.light_proto.as_ref().map(|x| x.clone()) {
self.network.register_protocol(light_proto, self.light_subprotocol_name, ::light::net::PACKET_COUNT, ::light::net::PROTOCOL_VERSIONS)
@ -335,6 +335,11 @@ impl ChainNotify for EthSync {
self.sync_handler.snapshot_service.abort_restore();
self.network.stop().unwrap_or_else(|e| warn!("Error stopping network: {:?}", e));
}
fn transactions_received(&self, hashes: Vec<H256>, peer_id: PeerId) {
let mut sync = self.sync_handler.sync.write();
sync.transactions_received(hashes, peer_id);
}
}
/// LES event handler.
@ -344,7 +349,7 @@ struct TxRelay(Arc<BlockChainClient>);
impl LightHandler for TxRelay {
fn on_transactions(&self, ctx: &EventContext, relay: &[::ethcore::transaction::SignedTransaction]) {
trace!(target: "les", "Relaying {} transactions from peer {}", relay.len(), ctx.peer());
self.0.queue_transactions(relay.iter().map(|tx| ::rlp::encode(tx).to_vec()).collect())
self.0.queue_transactions(relay.iter().map(|tx| ::rlp::encode(tx).to_vec()).collect(), ctx.peer())
}
}
@ -547,4 +552,4 @@ pub struct ServiceConfiguration {
pub net: NetworkConfiguration,
/// IPC path.
pub io_path: String,
}
}

9
sync/src/chain.rs
View File

@ -432,6 +432,13 @@ impl ChainSync {
self.transactions_stats.stats()
}
/// Updates transactions were received by a peer
pub fn transactions_received(&mut self, hashes: Vec<H256>, peer_id: PeerId) {
if let Some(mut peer_info) = self.peers.get_mut(&peer_id) {
peer_info.last_sent_transactions.extend(&hashes);
}
}
/// Abort all sync activity
pub fn abort(&mut self, io: &mut SyncIo) {
self.reset_and_continue(io);
@ -1409,7 +1416,7 @@ impl ChainSync {
let tx = rlp.as_raw().to_vec();
transactions.push(tx);
}
io.chain().queue_transactions(transactions);
io.chain().queue_transactions(transactions, peer_id);
Ok(())
}

2
sync/src/transactions_stats.rs
View File

@ -112,7 +112,7 @@ mod tests {
propagated_to: hash_map![
enodeid1 => 2,
enodeid2 => 1
]
],
}));
}

2
util/network/src/lib.rs
View File

@ -99,7 +99,7 @@ pub use stats::NetworkStats;
pub use session::SessionInfo;
use io::TimerToken;
pub use node_table::is_valid_node_url;
pub use node_table::{is_valid_node_url, NodeId};
const PROTOCOL_VERSION: u32 = 4;