blockworks-foundation
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solana
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Forward transactions to the expected leader instead of your own TPU port (#12004) 

* Use PoHRecorder to send to the right leader

* cleanup

* fmt

* clippy

* Cleanup, fix bug

Co-authored-by: Carl <carl@solana.com>
This commit is contained in:
anatoly yakovenko 2020-09-08 02:00:49 -07:00 committed by GitHub
parent 9eebaa2e59
commit c67f8bd821
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 497 additions and 65 deletions
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2
Cargo.lock generated
View File

@ -3326,7 +3326,9 @@ version = "1.4.0"
dependencies = [
"bincode",
"futures 0.3.5",
"log 0.4.8",
"solana-banks-interface",
"solana-metrics",
"solana-runtime",
"solana-sdk 1.4.0",
"tarpc",

2
banks-server/Cargo.toml
View File

@ -11,9 +11,11 @@ edition = "2018"
[dependencies]
bincode = "1.3.1"
futures = "0.3"
log = "0.4.8"
solana-banks-interface = { path = "../banks-interface", version = "1.4.0" }
solana-runtime = { path = "../runtime", version = "1.4.0" }
solana-sdk = { path = "../sdk", version = "1.4.0" }
solana-metrics = { path = "../metrics", version = "1.4.0" }
tarpc = { version = "0.21.0", features = ["full"] }
tokio = "0.2"
tokio-serde = { version = "0.6", features = ["bincode"] }

2
banks-server/src/banks_server.rs
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@ -1,3 +1,4 @@
use crate::send_transaction_service::{SendTransactionService, TransactionInfo};
use bincode::{deserialize, serialize};
use futures::{
future,
@ -8,7 +9,6 @@ use solana_runtime::{
bank::Bank,
bank_forks::BankForks,
commitment::{BlockCommitmentCache, CommitmentSlots},
send_transaction_service::{SendTransactionService, TransactionInfo},
};
use solana_sdk::{
account::Account,

4
banks-server/src/lib.rs
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@ -1,2 +1,6 @@
pub mod banks_server;
pub mod rpc_banks_service;
pub mod send_transaction_service;
#[macro_use]
extern crate solana_metrics;

4
runtime/src/send_transaction_service.rs → banks-server/src/send_transaction_service.rs
View File

@ -1,6 +1,6 @@
use crate::{bank::Bank, bank_forks::BankForks};
use log::*;
use solana_metrics::{datapoint_warn, inc_new_counter_info};
use solana_runtime::{bank::Bank, bank_forks::BankForks};
use solana_sdk::{clock::Slot, signature::Signature};
use std::{
collections::HashMap,
@ -205,8 +205,6 @@ mod test {
#[test]
fn process_transactions() {
solana_logger::setup();
let (genesis_config, mint_keypair) = create_genesis_config(4);
let bank = Bank::new(&genesis_config);
let bank_forks = Arc::new(RwLock::new(BankForks::new(bank)));

1
core/src/lib.rs
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@ -58,6 +58,7 @@ pub mod rpc_pubsub;
pub mod rpc_pubsub_service;
pub mod rpc_service;
pub mod rpc_subscriptions;
pub mod send_transaction_service;
pub mod serve_repair;
pub mod serve_repair_service;
pub mod sigverify;

25
core/src/rpc.rs
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@ -1,9 +1,13 @@
//! The `rpc` module implements the Solana RPC interface.
use crate::{
cluster_info::ClusterInfo, contact_info::ContactInfo,
non_circulating_supply::calculate_non_circulating_supply, rpc_error::RpcCustomError,
rpc_health::*, validator::ValidatorExit,
cluster_info::ClusterInfo,
contact_info::ContactInfo,
non_circulating_supply::calculate_non_circulating_supply,
rpc_error::RpcCustomError,
rpc_health::*,
send_transaction_service::{SendTransactionService, TransactionInfo},
validator::ValidatorExit,
};
use bincode::{config::Options, serialize};
use jsonrpc_core::{types::error, Error, Metadata, Result};
@ -36,7 +40,6 @@ use solana_runtime::{
bank::Bank,
bank_forks::BankForks,
commitment::{BlockCommitmentArray, BlockCommitmentCache, CommitmentSlots},
send_transaction_service::{SendTransactionService, TransactionInfo},
};
use solana_sdk::{
account::Account,
@ -213,7 +216,7 @@ impl JsonRpcRequestProcessor {
let cluster_info = Arc::new(ClusterInfo::default());
let tpu_address = cluster_info.my_contact_info().tpu;
let (sender, receiver) = channel();
SendTransactionService::new(tpu_address, &bank_forks, &exit, receiver);
SendTransactionService::new(tpu_address, &bank_forks, None, &exit, receiver);
Self {
config: JsonRpcConfig::default(),
@ -2692,7 +2695,7 @@ pub mod tests {
&runtime::Runtime::new().unwrap(),
None,
);
SendTransactionService::new(tpu_address, &bank_forks, &exit, receiver);
SendTransactionService::new(tpu_address, &bank_forks, None, &exit, receiver);
cluster_info.insert_info(ContactInfo::new_with_pubkey_socketaddr(
&leader_pubkey,
@ -4004,7 +4007,7 @@ pub mod tests {
&runtime::Runtime::new().unwrap(),
None,
);
SendTransactionService::new(tpu_address, &bank_forks, &exit, receiver);
SendTransactionService::new(tpu_address, &bank_forks, None, &exit, receiver);
let req = r#"{"jsonrpc":"2.0","id":1,"method":"sendTransaction","params":["37u9WtQpcm6ULa3Vmu7ySnANv"]}"#;
let res = io.handle_request_sync(req, meta);
@ -4045,7 +4048,7 @@ pub mod tests {
&runtime::Runtime::new().unwrap(),
None,
);
SendTransactionService::new(tpu_address, &bank_forks, &exit, receiver);
SendTransactionService::new(tpu_address, &bank_forks, None, &exit, receiver);
let mut bad_transaction =
system_transaction::transfer(&mint_keypair, &Pubkey::new_rand(), 42, Hash::default());
@ -4227,7 +4230,7 @@ pub mod tests {
&runtime::Runtime::new().unwrap(),
None,
);
SendTransactionService::new(tpu_address, &bank_forks, &exit, receiver);
SendTransactionService::new(tpu_address, &bank_forks, None, &exit, receiver);
assert_eq!(request_processor.validator_exit(), false);
assert_eq!(exit.load(Ordering::Relaxed), false);
}
@ -4256,7 +4259,7 @@ pub mod tests {
&runtime::Runtime::new().unwrap(),
None,
);
SendTransactionService::new(tpu_address, &bank_forks, &exit, receiver);
SendTransactionService::new(tpu_address, &bank_forks, None, &exit, receiver);
assert_eq!(request_processor.validator_exit(), true);
assert_eq!(exit.load(Ordering::Relaxed), true);
}
@ -4342,7 +4345,7 @@ pub mod tests {
&runtime::Runtime::new().unwrap(),
None,
);
SendTransactionService::new(tpu_address, &bank_forks, &exit, receiver);
SendTransactionService::new(tpu_address, &bank_forks, None, &exit, receiver);
assert_eq!(
request_processor.get_block_commitment(0),
RpcBlockCommitment {

19
core/src/rpc_service.rs
View File

@ -1,8 +1,13 @@
//! The `rpc_service` module implements the Solana JSON RPC service.
use crate::{
bigtable_upload_service::BigTableUploadService, cluster_info::ClusterInfo, rpc::*,
rpc_health::*, validator::ValidatorExit,
bigtable_upload_service::BigTableUploadService,
cluster_info::ClusterInfo,
poh_recorder::PohRecorder,
rpc::*,
rpc_health::*,
send_transaction_service::{LeaderInfo, SendTransactionService},
validator::ValidatorExit,
};
use jsonrpc_core::MetaIoHandler;
use jsonrpc_http_server::{
@ -14,7 +19,6 @@ use solana_ledger::blockstore::Blockstore;
use solana_runtime::{
bank_forks::{BankForks, SnapshotConfig},
commitment::BlockCommitmentCache,
send_transaction_service::SendTransactionService,
snapshot_utils,
};
use solana_sdk::{hash::Hash, native_token::lamports_to_sol, pubkey::Pubkey};
@ -23,7 +27,7 @@ use std::{
net::SocketAddr,
path::{Path, PathBuf},
sync::atomic::{AtomicBool, Ordering},
sync::{mpsc::channel, Arc, RwLock},
sync::{mpsc::channel, Arc, Mutex, RwLock},
thread::{self, Builder, JoinHandle},
};
use tokio::runtime;
@ -239,6 +243,7 @@ impl JsonRpcService {
block_commitment_cache: Arc<RwLock<BlockCommitmentCache>>,
blockstore: Arc<Blockstore>,
cluster_info: Arc<ClusterInfo>,
poh_recorder: Option<Arc<Mutex<PohRecorder>>>,
genesis_hash: Hash,
ledger_path: &Path,
validator_exit: Arc<RwLock<Option<ValidatorExit>>>,
@ -302,16 +307,19 @@ impl JsonRpcService {
blockstore,
validator_exit.clone(),
health.clone(),
cluster_info,
cluster_info.clone(),
genesis_hash,
&runtime,
bigtable_ledger_storage,
);
let exit_send_transaction_service = Arc::new(AtomicBool::new(false));
let leader_info =
poh_recorder.map(|recorder| LeaderInfo::new(cluster_info.clone(), recorder));
let _send_transaction_service = Arc::new(SendTransactionService::new(
tpu_address,
&bank_forks,
leader_info,
&exit_send_transaction_service,
receiver,
));
@ -438,6 +446,7 @@ mod tests {
block_commitment_cache,
blockstore,
cluster_info,
None,
Hash::default(),
&PathBuf::from("farf"),
validator_exit,

413
core/src/send_transaction_service.rs Normal file
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@ -0,0 +1,413 @@
use crate::cluster_info::ClusterInfo;
use crate::poh_recorder::PohRecorder;
use log::*;
use solana_metrics::{datapoint_warn, inc_new_counter_info};
use solana_runtime::{bank::Bank, bank_forks::BankForks};
use solana_sdk::{clock::Slot, pubkey::Pubkey, signature::Signature};
use std::sync::Mutex;
use std::{
collections::HashMap,
net::{SocketAddr, UdpSocket},
sync::{
atomic::{AtomicBool, Ordering},
mpsc::Receiver,
Arc, RwLock,
},
thread::{self, Builder, JoinHandle},
time::{Duration, Instant},
};
/// Maximum size of the transaction queue
const MAX_TRANSACTION_QUEUE_SIZE: usize = 10_000; // This seems like a lot but maybe it needs to be bigger one day
pub struct SendTransactionService {
thread: JoinHandle<()>,
}
pub struct TransactionInfo {
pub signature: Signature,
pub wire_transaction: Vec<u8>,
pub last_valid_slot: Slot,
}
impl TransactionInfo {
pub fn new(signature: Signature, wire_transaction: Vec<u8>, last_valid_slot: Slot) -> Self {
Self {
signature,
wire_transaction,
last_valid_slot,
}
}
}
pub struct LeaderInfo {
cluster_info: Arc<ClusterInfo>,
poh_recorder: Arc<Mutex<PohRecorder>>,
recent_peers: HashMap<Pubkey, SocketAddr>,
}
impl LeaderInfo {
pub fn new(cluster_info: Arc<ClusterInfo>, poh_recorder: Arc<Mutex<PohRecorder>>) -> Self {
Self {
cluster_info,
poh_recorder,
recent_peers: HashMap::new(),
}
}
pub fn refresh_recent_peers(&mut self) {
self.recent_peers = self
.cluster_info
.tpu_peers()
.into_iter()
.map(|ci| (ci.id, ci.tpu))
.collect();
}
pub fn get_leader_tpu(&self) -> Option<&SocketAddr> {
self.poh_recorder
.lock()
.unwrap()
.leader_after_n_slots(0)
.and_then(|leader| self.recent_peers.get(&leader))
}
}
#[derive(Default, Debug, PartialEq)]
struct ProcessTransactionsResult {
rooted: u64,
expired: u64,
retried: u64,
failed: u64,
retained: u64,
}
impl SendTransactionService {
pub fn new(
tpu_address: SocketAddr,
bank_forks: &Arc<RwLock<BankForks>>,
leader_info: Option<LeaderInfo>,
exit: &Arc<AtomicBool>,
receiver: Receiver<TransactionInfo>,
) -> Self {
let thread = Self::retry_thread(
tpu_address,
receiver,
bank_forks.clone(),
leader_info,
exit.clone(),
);
Self { thread }
}
fn retry_thread(
tpu_address: SocketAddr,
receiver: Receiver<TransactionInfo>,
bank_forks: Arc<RwLock<BankForks>>,
mut leader_info: Option<LeaderInfo>,
exit: Arc<AtomicBool>,
) -> JoinHandle<()> {
let mut last_status_check = Instant::now();
let mut transactions = HashMap::new();
let send_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
if let Some(leader_info) = leader_info.as_mut() {
leader_info.refresh_recent_peers();
}
Builder::new()
.name("send-tx-svc".to_string())
.spawn(move || loop {
if exit.load(Ordering::Relaxed) {
break;
}
if let Ok(transaction_info) = receiver.recv_timeout(Duration::from_secs(1)) {
let address = leader_info
.as_ref()
.and_then(|leader_info| leader_info.get_leader_tpu())
.unwrap_or(&tpu_address);
Self::send_transaction(
&send_socket,
address,
&transaction_info.wire_transaction,
);
if transactions.len() < MAX_TRANSACTION_QUEUE_SIZE {
transactions.insert(transaction_info.signature, transaction_info);
} else {
datapoint_warn!("send_transaction_service-queue-overflow");
}
}
if Instant::now().duration_since(last_status_check).as_secs() >= 5 {
if !transactions.is_empty() {
datapoint_info!(
"send_transaction_service-queue-size",
("len", transactions.len(), i64)
);
let bank_forks = bank_forks.read().unwrap();
let root_bank = bank_forks.root_bank();
let working_bank = bank_forks.working_bank();
let _result = Self::process_transactions(
&working_bank,
&root_bank,
&send_socket,
&tpu_address,
&mut transactions,
&leader_info,
);
}
last_status_check = Instant::now();
if let Some(leader_info) = leader_info.as_mut() {
leader_info.refresh_recent_peers();
}
}
})
.unwrap()
}
fn process_transactions(
working_bank: &Arc<Bank>,
root_bank: &Arc<Bank>,
send_socket: &UdpSocket,
tpu_address: &SocketAddr,
transactions: &mut HashMap<Signature, TransactionInfo>,
leader_info: &Option<LeaderInfo>,
) -> ProcessTransactionsResult {
let mut result = ProcessTransactionsResult::default();
transactions.retain(|signature, transaction_info| {
if root_bank.has_signature(signature) {
info!("Transaction is rooted: {}", signature);
result.rooted += 1;
inc_new_counter_info!("send_transaction_service-rooted", 1);
false
} else if transaction_info.last_valid_slot < root_bank.slot() {
info!("Dropping expired transaction: {}", signature);
result.expired += 1;
inc_new_counter_info!("send_transaction_service-expired", 1);
false
} else {
match working_bank.get_signature_status_slot(signature) {
None => {
// Transaction is unknown to the working bank, it might have been
// dropped or landed in another fork. Re-send it
info!("Retrying transaction: {}", signature);
result.retried += 1;
inc_new_counter_info!("send_transaction_service-retry", 1);
Self::send_transaction(
&send_socket,
leader_info
.as_ref()
.and_then(|leader_info| leader_info.get_leader_tpu())
.unwrap_or(&tpu_address),
&transaction_info.wire_transaction,
);
true
}
Some((_slot, status)) => {
if status.is_err() {
info!("Dropping failed transaction: {}", signature);
result.failed += 1;
inc_new_counter_info!("send_transaction_service-failed", 1);
false
} else {
result.retained += 1;
true
}
}
}
}
});
result
}
fn send_transaction(
send_socket: &UdpSocket,
tpu_address: &SocketAddr,
wire_transaction: &[u8],
) {
if let Err(err) = send_socket.send_to(wire_transaction, tpu_address) {
warn!("Failed to send transaction to {}: {:?}", tpu_address, err);
}
}
pub fn join(self) -> thread::Result<()> {
self.thread.join()
}
}
#[cfg(test)]
mod test {
use super::*;
use solana_sdk::{
genesis_config::create_genesis_config, pubkey::Pubkey, signature::Signer,
system_transaction,
};
use std::sync::mpsc::channel;
#[test]
fn service_exit() {
let tpu_address = "127.0.0.1:0".parse().unwrap();
let bank = Bank::default();
let bank_forks = Arc::new(RwLock::new(BankForks::new(bank)));
let exit = Arc::new(AtomicBool::new(false));
let (_sender, receiver) = channel();
let send_tranaction_service =
SendTransactionService::new(tpu_address, &bank_forks, None, &exit, receiver);
exit.store(true, Ordering::Relaxed);
send_tranaction_service.join().unwrap();
}
#[test]
fn process_transactions() {
solana_logger::setup();
let (genesis_config, mint_keypair) = create_genesis_config(4);
let bank = Bank::new(&genesis_config);
let bank_forks = Arc::new(RwLock::new(BankForks::new(bank)));
let send_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
let tpu_address = "127.0.0.1:0".parse().unwrap();
let root_bank = Arc::new(Bank::new_from_parent(
&bank_forks.read().unwrap().working_bank(),
&Pubkey::default(),
1,
));
let rooted_signature = root_bank
.transfer(1, &mint_keypair, &mint_keypair.pubkey())
.unwrap();
let working_bank = Arc::new(Bank::new_from_parent(&root_bank, &Pubkey::default(), 2));
let non_rooted_signature = working_bank
.transfer(2, &mint_keypair, &mint_keypair.pubkey())
.unwrap();
let failed_signature = {
let blockhash = working_bank.last_blockhash();
let transaction =
system_transaction::transfer(&mint_keypair, &Pubkey::default(), 1, blockhash);
let signature = transaction.signatures[0];
working_bank.process_transaction(&transaction).unwrap_err();
signature
};
let mut transactions = HashMap::new();
info!("Expired transactions are dropped..");
transactions.insert(
Signature::default(),
TransactionInfo::new(Signature::default(), vec![], root_bank.slot() - 1),
);
let result = SendTransactionService::process_transactions(
&working_bank,
&root_bank,
&send_socket,
&tpu_address,
&mut transactions,
&None,
);
assert!(transactions.is_empty());
assert_eq!(
result,
ProcessTransactionsResult {
expired: 1,
..ProcessTransactionsResult::default()
}
);
info!("Rooted transactions are dropped...");
transactions.insert(
rooted_signature,
TransactionInfo::new(rooted_signature, vec![], working_bank.slot()),
);
let result = SendTransactionService::process_transactions(
&working_bank,
&root_bank,
&send_socket,
&tpu_address,
&mut transactions,
&None,
);
assert!(transactions.is_empty());
assert_eq!(
result,
ProcessTransactionsResult {
rooted: 1,
..ProcessTransactionsResult::default()
}
);
info!("Failed transactions are dropped...");
transactions.insert(
failed_signature,
TransactionInfo::new(failed_signature, vec![], working_bank.slot()),
);
let result = SendTransactionService::process_transactions(
&working_bank,
&root_bank,
&send_socket,
&tpu_address,
&mut transactions,
&None,
);
assert!(transactions.is_empty());
assert_eq!(
result,
ProcessTransactionsResult {
failed: 1,
..ProcessTransactionsResult::default()
}
);
info!("Non-rooted transactions are kept...");
transactions.insert(
non_rooted_signature,
TransactionInfo::new(non_rooted_signature, vec![], working_bank.slot()),
);
let result = SendTransactionService::process_transactions(
&working_bank,
&root_bank,
&send_socket,
&tpu_address,
&mut transactions,
&None,
);
assert_eq!(transactions.len(), 1);
assert_eq!(
result,
ProcessTransactionsResult {
retained: 1,
..ProcessTransactionsResult::default()
}
);
transactions.clear();
info!("Unknown transactions are retried...");
transactions.insert(
Signature::default(),
TransactionInfo::new(Signature::default(), vec![], working_bank.slot()),
);
let result = SendTransactionService::process_transactions(
&working_bank,
&root_bank,
&send_socket,
&tpu_address,
&mut transactions,
&None,
);
assert_eq!(transactions.len(), 1);
assert_eq!(
result,
ProcessTransactionsResult {
retried: 1,
..ProcessTransactionsResult::default()
}
);
}
}

89
core/src/validator.rs
View File

@ -297,49 +297,6 @@ impl Validator {
&exit,
);
let rpc_override_health_check = Arc::new(AtomicBool::new(false));
let rpc_service = config
.rpc_ports
.map(|(rpc_port, rpc_pubsub_port, rpc_banks_port)| {
if ContactInfo::is_valid_address(&node.info.rpc) {
assert!(ContactInfo::is_valid_address(&node.info.rpc_pubsub));
assert_eq!(rpc_port, node.info.rpc.port());
assert_eq!(rpc_pubsub_port, node.info.rpc_pubsub.port());
assert_eq!(rpc_banks_port, node.info.rpc_banks.port());
} else {
assert!(!ContactInfo::is_valid_address(&node.info.rpc_pubsub));
}
let tpu_address = cluster_info.my_contact_info().tpu;
(
JsonRpcService::new(
SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), rpc_port),
config.rpc_config.clone(),
config.snapshot_config.clone(),
bank_forks.clone(),
block_commitment_cache.clone(),
blockstore.clone(),
cluster_info.clone(),
genesis_config.hash(),
ledger_path,
validator_exit.clone(),
config.trusted_validators.clone(),
rpc_override_health_check.clone(),
),
PubSubService::new(
&subscriptions,
SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), rpc_pubsub_port),
&exit,
),
RpcBanksService::new(
SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), rpc_banks_port),
tpu_address,
&bank_forks,
&block_commitment_cache,
&exit,
),
)
});
info!(
"Starting PoH: epoch={} slot={} tick_height={} blockhash={} leader={:?}",
bank.epoch(),
@ -362,7 +319,7 @@ impl Validator {
std::thread::park();
}
let poh_config = Arc::new(genesis_config.poh_config);
let poh_config = Arc::new(genesis_config.poh_config.clone());
let (mut poh_recorder, entry_receiver) = PohRecorder::new_with_clear_signal(
bank.tick_height(),
bank.last_blockhash(),
@ -386,6 +343,50 @@ impl Validator {
}
let poh_recorder = Arc::new(Mutex::new(poh_recorder));
let rpc_override_health_check = Arc::new(AtomicBool::new(false));
let rpc_service = config
.rpc_ports
.map(|(rpc_port, rpc_pubsub_port, rpc_banks_port)| {
if ContactInfo::is_valid_address(&node.info.rpc) {
assert!(ContactInfo::is_valid_address(&node.info.rpc_pubsub));
assert_eq!(rpc_port, node.info.rpc.port());
assert_eq!(rpc_pubsub_port, node.info.rpc_pubsub.port());
assert_eq!(rpc_banks_port, node.info.rpc_banks.port());
} else {
assert!(!ContactInfo::is_valid_address(&node.info.rpc_pubsub));
}
let tpu_address = cluster_info.my_contact_info().tpu;
(
JsonRpcService::new(
SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), rpc_port),
config.rpc_config.clone(),
config.snapshot_config.clone(),
bank_forks.clone(),
block_commitment_cache.clone(),
blockstore.clone(),
cluster_info.clone(),
Some(poh_recorder.clone()),
genesis_config.hash(),
ledger_path,
validator_exit.clone(),
config.trusted_validators.clone(),
rpc_override_health_check.clone(),
),
PubSubService::new(
&subscriptions,
SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), rpc_pubsub_port),
&exit,
),
RpcBanksService::new(
SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), rpc_banks_port),
tpu_address,
&bank_forks,
&block_commitment_cache,
&exit,
),
)
});
let ip_echo_server = solana_net_utils::ip_echo_server(node.sockets.ip_echo.unwrap());
let gossip_service = GossipService::new(

1
runtime/src/lib.rs
View File

@ -20,7 +20,6 @@ pub mod message_processor;
mod native_loader;
pub mod nonce_utils;
pub mod rent_collector;
pub mod send_transaction_service;
pub mod serde_snapshot;
pub mod snapshot_package;
pub mod snapshot_utils;