lighthouse/validator_client/src/service.rs

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/// The validator service. Connects to a beacon node and signs blocks when required.
use crate::attester_service::{AttestationGrpcClient, AttesterService};
use crate::block_producer_service::{BeaconBlockGrpcClient, BlockProducerService};
use crate::config::Config as ValidatorConfig;
use crate::duties::{DutiesManager, DutiesManagerService, EpochDutiesMap};
use attester::test_utils::EpochMap;
use attester::{test_utils::LocalSigner as AttesterLocalSigner, Attester};
use block_proposer::{test_utils::LocalSigner as BlockProposerLocalSigner, BlockProducer};
use bls::Keypair;
use grpcio::{ChannelBuilder, EnvBuilder};
use protos::services::{Empty, NodeInfo};
use protos::services_grpc::{
AttestationServiceClient, BeaconBlockServiceClient, BeaconNodeServiceClient,
ValidatorServiceClient,
};
use slog::{info, o, warn, Drain};
use slot_clock::SystemTimeSlotClock;
use std::sync::Arc;
use std::thread;
use std::time::Duration;
use types::{Epoch, Fork};
/// The validator service. This is the main thread that executes and maintains validator
/// duties.
pub struct Service {
/// The node we currently connected to.
connected_node_version: String,
/// The chain id we are processing on.
chain_id: u16,
/// The fork state we processing on.
fork: Fork,
/// The slot clock keeping track of time.
slot_clock: Arc<SystemTimeSlotClock>,
}
impl Service {
/// Initial connection to the beacon node to determine its properties.
fn connect_to_node(
node_client: Arc<BeaconNodeServiceClient>,
seconds_per_slot: u64,
log: &slog::Logger,
) -> Self {
// retrieve node information
let node_info = loop {
let info = match node_client.info(&Empty::new()) {
Err(e) => {
warn!(log, "Could not connect to node. Error: {}", e);
info!(log, "Retrying in 5 seconds...");
std::thread::sleep(Duration::from_secs(5));
continue;
}
Ok(info) => break info,
};
};
// build requisite objects to form Self
let genesis_time = node_info.get_genesis_time();
info!(log,"Beacon node connected"; "Node Version" => node_info.version.clone(), "Chain ID" => node_info.chain_id, "Genesis time" => genesis_time);
let proto_fork = node_info.get_fork();
let mut previous_version: [u8; 4] = [0; 4];
let mut current_version: [u8; 4] = [0; 4];
previous_version.copy_from_slice(&proto_fork.get_previous_version()[..4]);
current_version.copy_from_slice(&proto_fork.get_current_version()[..4]);
let fork = Fork {
previous_version,
current_version,
epoch: Epoch::from(proto_fork.get_epoch()),
};
// build the validator slot clock
let slot_clock = {
let clock = SystemTimeSlotClock::new(genesis_time, seconds_per_slot)
.expect("Unable to instantiate SystemTimeSlotClock.");
Arc::new(clock)
};
Self {
connected_node_version: node_info.version,
chain_id: node_info.chain_id as u16,
fork,
slot_clock,
}
}
pub fn start(config: ValidatorConfig, log: slog::Logger) {
// initialize the RPC clients
let env = Arc::new(EnvBuilder::new().build());
// Beacon node gRPC beacon node endpoints.
let beacon_node_grpc_client = {
let ch = ChannelBuilder::new(env.clone()).connect(&config.server);
Arc::new(BeaconNodeServiceClient::new(ch))
};
// Beacon node gRPC beacon block endpoints.
let beacon_block_grpc_client = {
let ch = ChannelBuilder::new(env.clone()).connect(&config.server);
Arc::new(BeaconBlockServiceClient::new(ch))
};
// Beacon node gRPC validator endpoints.
let validator_grpc_client = {
let ch = ChannelBuilder::new(env.clone()).connect(&config.server);
Arc::new(ValidatorServiceClient::new(ch))
};
//Beacon node gRPC attester endpoints.
let attester_grpc_client = {
let ch = ChannelBuilder::new(env.clone()).connect(&config.server);
Arc::new(AttestationServiceClient::new(ch))
};
let spec = Arc::new(config.spec);
// connect to the node and retrieve its properties
let service =
Service::connect_to_node(beacon_node_grpc_client, spec.seconds_per_slot, &log);
let poll_interval_millis = spec.seconds_per_slot * 1000 / 10; // 10% epoch time precision.
info!(log, "Starting block producer service"; "polls_per_epoch" => spec.seconds_per_slot * 1000 / poll_interval_millis);
let genesis_time = 1_549_935_547;
let slot_clock = {
info!(log, "Genesis time"; "unix_epoch_seconds" => genesis_time);
let clock = SystemTimeSlotClock::new(genesis_time, spec.seconds_per_slot)
.expect("Unable to instantiate SystemTimeSlotClock.");
Arc::new(clock)
};
/*
* Start threads.
*/
let mut threads = vec![];
// TODO: keypairs are randomly generated; they should be loaded from a file or generated.
// https://github.com/sigp/lighthouse/issues/160
let keypairs = vec![Keypair::random()];
for keypair in keypairs {
info!(log, "Starting validator services"; "validator" => keypair.pk.concatenated_hex_id());
let duties_map = Arc::new(EpochDutiesMap::new(spec.slots_per_epoch));
let epoch_map_for_attester = Arc::new(EpochMap::new(spec.slots_per_epoch));
// Spawn a new thread to maintain the validator's `EpochDuties`.
let duties_manager_thread = {
let spec = spec.clone();
let duties_map = duties_map.clone();
let slot_clock = slot_clock.clone();
let log = log.clone();
let beacon_node = validator_grpc_client.clone();
let pubkey = keypair.pk.clone();
thread::spawn(move || {
let manager = DutiesManager {
duties_map,
pubkey,
spec,
slot_clock,
beacon_node,
};
let mut duties_manager_service = DutiesManagerService {
manager,
poll_interval_millis,
log,
};
duties_manager_service.run();
})
};
// Spawn a new thread to perform block production for the validator.
let producer_thread = {
let spec = spec.clone();
let signer = Arc::new(BlockProposerLocalSigner::new(keypair.clone()));
let duties_map = duties_map.clone();
let slot_clock = slot_clock.clone();
let log = log.clone();
let client = Arc::new(BeaconBlockGrpcClient::new(beacon_block_grpc_client.clone()));
thread::spawn(move || {
let block_producer =
BlockProducer::new(spec, duties_map, slot_clock, client, signer);
let mut block_producer_service = BlockProducerService {
block_producer,
poll_interval_millis,
log,
};
block_producer_service.run();
})
};
// Spawn a new thread for attestation for the validator.
let attester_thread = {
let signer = Arc::new(AttesterLocalSigner::new(keypair.clone()));
let epoch_map = epoch_map_for_attester.clone();
let slot_clock = slot_clock.clone();
let log = log.clone();
let client = Arc::new(AttestationGrpcClient::new(attester_grpc_client.clone()));
thread::spawn(move || {
let attester = Attester::new(epoch_map, slot_clock, client, signer);
let mut attester_service = AttesterService {
attester,
poll_interval_millis,
log,
};
attester_service.run();
})
};
threads.push((duties_manager_thread, producer_thread, attester_thread));
}
// Naively wait for all the threads to complete.
for tuple in threads {
let (manager, producer, attester) = tuple;
let _ = producer.join();
let _ = manager.join();
let _ = attester.join();
}
}
}