snarkos_node/

node.rs

// Copyright (c) 2019-2026 Provable Inc.
// This file is part of the snarkOS library.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::{
    BootstrapClient,
    Client,
    Prover,
    Validator,
    network::{NodeType, Peer, PeerPoolHandling},
    router::Outbound,
    traits::NodeInterface,
};

use snarkos_account::Account;
use snarkos_utilities::{NodeDataDir, SignalHandler};

use snarkvm::prelude::{
    Address,
    Header,
    Ledger,
    Network,
    PrivateKey,
    ViewKey,
    block::Block,
    store::helpers::{memory::ConsensusMemory, rocksdb::ConsensusDB},
};

use aleo_std::{StorageMode, aleo_ledger_dir};
use anyhow::{Result, bail};

#[cfg(feature = "locktick")]
use locktick::parking_lot::RwLock;
#[cfg(not(feature = "locktick"))]
use parking_lot::RwLock;
use std::{
    cmp,
    collections::HashMap,
    fs,
    net::SocketAddr,
    path::{Path, PathBuf},
    str::FromStr,
    sync::Arc,
    time::Duration,
};
use tokio::task;

/// The number of blocks between automatic database checkpoints.
const CHECKPOINT_BLOCK_FREQUENCY: u32 = 1000;

/// The maximum number of automatic database checkpoints kept at any time.
const MAX_AUTO_CHECKPOINTS: usize = 5;

fn existing_startup_checkpoint_height(auto_checkpoint_path: &Path, startup_height: u32) -> Option<u32> {
    let mut checkpoint_path = auto_checkpoint_path.to_path_buf();
    checkpoint_path.push(format!("checkpoint_{startup_height}"));
    checkpoint_path.is_dir().then_some(startup_height)
}

#[derive(Clone)]
pub enum Node<N: Network> {
    /// A validator is a full node, capable of validating blocks.
    Validator(Arc<Validator<N, ConsensusDB<N>>>),
    /// A prover is a light node, capable of producing proofs for consensus.
    Prover(Arc<Prover<N, ConsensusMemory<N>>>),
    /// A client node is a full node, capable of querying with the network.
    Client(Arc<Client<N, ConsensusDB<N>>>),
    /// A bootstrap client node is a light node dedicated to serving lists of peers.
    BootstrapClient(BootstrapClient<N>),
}

impl<N: Network> Node<N> {
    /// Initializes a new validator node.
    pub async fn new_validator(
        node_ip: SocketAddr,
        bft_ip: Option<SocketAddr>,
        rest_ip: Option<SocketAddr>,
        rest_rps: u32,
        account: Account<N>,
        trusted_peers: &[SocketAddr],
        trusted_validators: &[SocketAddr],
        genesis: Block<N>,
        cdn: Option<http::Uri>,
        storage_mode: StorageMode,
        node_data_dir: NodeDataDir,
        trusted_peers_only: bool,
        auto_db_checkpoints: Option<PathBuf>,
        dev_txs: bool,
        dev: Option<u16>,
        slipstream_configs: &[PathBuf],
        dev_num_validators_for_committee_hotswap: Option<u16>,
        signal_handler: Arc<SignalHandler>,
    ) -> Result<Self> {
        let validator = Arc::new(
            Validator::new(
                node_ip,
                bft_ip,
                rest_ip,
                rest_rps,
                account,
                trusted_peers,
                trusted_validators,
                genesis,
                cdn,
                storage_mode,
                node_data_dir,
                trusted_peers_only,
                dev_txs,
                dev,
                slipstream_configs,
                dev_num_validators_for_committee_hotswap,
                signal_handler,
            )
            .await?,
        );

        let node = Self::Validator(validator.clone());

        // Perform automatic ledger checkpoints.
        if let Some(path) = auto_db_checkpoints {
            if let Some(handle) = node.perform_auto_checkpoints(path)? {
                validator.handles.lock().push(handle);
            }
        }

        Ok(node)
    }

    /// Initializes a new prover node.
    pub async fn new_prover(
        node_ip: SocketAddr,
        account: Account<N>,
        trusted_peers: &[SocketAddr],
        genesis: Block<N>,
        node_data_dir: NodeDataDir,
        trusted_peers_only: bool,
        dev: Option<u16>,
        signal_handler: Arc<SignalHandler>,
    ) -> Result<Self> {
        Ok(Self::Prover(Arc::new(
            Prover::new(
                node_ip,
                account,
                trusted_peers,
                genesis,
                node_data_dir,
                trusted_peers_only,
                dev,
                signal_handler,
            )
            .await?,
        )))
    }

    /// Initializes a new client node.
    pub async fn new_client(
        node_ip: SocketAddr,
        rest_ip: Option<SocketAddr>,
        rest_rps: u32,
        account: Account<N>,
        trusted_peers: &[SocketAddr],
        genesis: Block<N>,
        cdn: Option<http::Uri>,
        storage_mode: StorageMode,
        node_data_dir: NodeDataDir,
        trusted_peers_only: bool,
        auto_db_checkpoints: Option<PathBuf>,
        dev: Option<u16>,
        slipstream_configs: &[PathBuf],
        signal_handler: Arc<SignalHandler>,
    ) -> Result<Self> {
        let client = Arc::new(
            Client::new(
                node_ip,
                rest_ip,
                rest_rps,
                account,
                trusted_peers,
                genesis,
                cdn,
                storage_mode,
                node_data_dir,
                trusted_peers_only,
                dev,
                slipstream_configs,
                signal_handler,
            )
            .await?,
        );

        let node = Self::Client(client.clone());

        // Perform automatic ledger checkpoints.
        if let Some(path) = auto_db_checkpoints {
            if let Some(handle) = node.perform_auto_checkpoints(path)? {
                client.handles.lock().push(handle);
            }
        }

        Ok(node)
    }

    /// Initializes a new bootstrap client node.
    pub async fn new_bootstrap_client(
        listener_addr: SocketAddr,
        account: Account<N>,
        genesis_header: Header<N>,
        dev: Option<u16>,
    ) -> Result<Self> {
        Ok(Self::BootstrapClient(BootstrapClient::new(listener_addr, account, genesis_header, dev).await?))
    }

    /// Returns the node type.
    pub fn node_type(&self) -> NodeType {
        match self {
            Self::Validator(validator) => validator.node_type(),
            Self::Prover(prover) => prover.node_type(),
            Self::Client(client) => client.node_type(),
            Self::BootstrapClient(_) => NodeType::BootstrapClient,
        }
    }

    /// Returns the account private key of the node.
    pub fn private_key(&self) -> &PrivateKey<N> {
        match self {
            Self::Validator(node) => node.private_key(),
            Self::Prover(node) => node.private_key(),
            Self::Client(node) => node.private_key(),
            Self::BootstrapClient(node) => node.private_key(),
        }
    }

    /// Returns the account view key of the node.
    pub fn view_key(&self) -> &ViewKey<N> {
        match self {
            Self::Validator(node) => node.view_key(),
            Self::Prover(node) => node.view_key(),
            Self::Client(node) => node.view_key(),
            Self::BootstrapClient(node) => node.view_key(),
        }
    }

    /// Returns the account address of the node.
    pub fn address(&self) -> Address<N> {
        match self {
            Self::Validator(node) => node.address(),
            Self::Prover(node) => node.address(),
            Self::Client(node) => node.address(),
            Self::BootstrapClient(node) => node.address(),
        }
    }

    /// Returns `true` if the node is in development mode.
    pub fn is_dev(&self) -> bool {
        match self {
            Self::Validator(node) => node.is_dev(),
            Self::Prover(node) => node.is_dev(),
            Self::Client(node) => node.is_dev(),
            Self::BootstrapClient(node) => node.is_dev(),
        }
    }

    /// Returns a reference to the underlying peer pool.
    pub fn peer_pool(&self) -> &RwLock<HashMap<SocketAddr, Peer<N>>> {
        match self {
            Self::Validator(validator) => validator.router().peer_pool(),
            Self::Prover(prover) => prover.router().peer_pool(),
            Self::Client(client) => client.router().peer_pool(),
            Self::BootstrapClient(client) => client.peer_pool(),
        }
    }

    /// Get the underlying ledger (if any).
    pub fn ledger(&self) -> Option<&Ledger<N, ConsensusDB<N>>> {
        match self {
            Self::Validator(node) => Some(node.ledger()),
            Self::Prover(_) => None,
            Self::Client(node) => Some(node.ledger()),
            Self::BootstrapClient(_) => None,
        }
    }

    /// Returns `true` if the node is synced up to the latest block (within the given tolerance).
    pub fn is_block_synced(&self) -> bool {
        match self {
            Self::Validator(node) => node.is_block_synced(),
            Self::Prover(node) => node.is_block_synced(),
            Self::Client(node) => node.is_block_synced(),
            Self::BootstrapClient(_) => true,
        }
    }

    /// Returns the number of blocks this node is behind the greatest peer height,
    /// or `None` if not connected to peers yet.
    pub fn num_blocks_behind(&self) -> Option<u32> {
        match self {
            Self::Validator(node) => node.num_blocks_behind(),
            Self::Prover(node) => node.num_blocks_behind(),
            Self::Client(node) => node.num_blocks_behind(),
            Self::BootstrapClient(_) => Some(0),
        }
    }

    /// Calculates the current sync speed in blocks per second.
    /// Returns None if sync speed cannot be calculated (e.g., not syncing or insufficient data).
    pub fn get_sync_speed(&self) -> f64 {
        match self {
            Self::Validator(node) => node.get_sync_speed(),
            Self::Prover(node) => node.get_sync_speed(),
            Self::Client(node) => node.get_sync_speed(),
            Self::BootstrapClient(_) => 0.0,
        }
    }

    /// Shuts down the node.
    pub async fn shut_down(&self) {
        match self {
            Self::Validator(node) => node.shut_down().await,
            Self::Prover(node) => node.shut_down().await,
            Self::Client(node) => node.shut_down().await,
            Self::BootstrapClient(node) => node.shut_down().await,
        }
    }

    /// Waits until the node receives a signal.
    pub async fn wait_for_signals(&self, signal_handler: &SignalHandler) {
        match self {
            Self::Validator(node) => node.wait_for_signals(signal_handler).await,
            Self::Prover(node) => node.wait_for_signals(signal_handler).await,
            Self::Client(node) => node.wait_for_signals(signal_handler).await,
            Self::BootstrapClient(node) => node.wait_for_signals(signal_handler).await,
        }
    }

    /// Periodically creates automated ledger checkpoints.
    pub fn perform_auto_checkpoints(&self, auto_checkpoint_path: PathBuf) -> Result<Option<task::JoinHandle<()>>> {
        // Only perform checkpoints if there's a database involved.
        let Some(ledger) = self.ledger().cloned() else {
            return Ok(None);
        };

        // Ensure that the target path exists as a folder or create it.
        if !auto_checkpoint_path.exists() {
            if let Err(e) = fs::create_dir_all(&auto_checkpoint_path) {
                bail!("Couldn't create the specified path for the automatic ledger checkpoints: {e}");
            }
        } else if auto_checkpoint_path.exists() && !auto_checkpoint_path.is_dir() {
            bail!("The specified path for automatic ledger checkpoints is not a directory");
        }

        // Spawn a loop that will periodically create the checkpoints.
        let handle = tokio::spawn(async move {
            info!("Starting the automatic ledger checkpoint routine...");

            // Prepare some object that will be useful throughout the routine.
            let startup_height = ledger.vm().block_store().current_block_height();
            let mut last_checkpoint_height =
                existing_startup_checkpoint_height(auto_checkpoint_path.as_path(), startup_height);
            let mut existing_checkpoints = Vec::with_capacity(MAX_AUTO_CHECKPOINTS + 1);
            let mut block_tree_path = aleo_ledger_dir(N::ID, ledger.vm().block_store().storage_mode());
            block_tree_path.push("block_tree");

            loop {
                // A small delay that's smaller than block time. There are technically situations when
                // blocks can be inserted one after the other more quickly (syncing, multiple blocks in
                // a Subdag), those are edge cases unlikely to be encountered under normal conditions.
                tokio::time::sleep(Duration::from_millis(500)).await;

                // Skip if we've already created a checkpoint during this run, and the
                // number of blocks baked since then is lower than the configured threshold.
                let current_height = ledger.vm().block_store().current_block_height();
                if last_checkpoint_height.is_some_and(|checkpoint_height| {
                    current_height.saturating_sub(checkpoint_height) < CHECKPOINT_BLOCK_FREQUENCY
                }) {
                    continue;
                }

                // Create a checkpoint.
                let mut checkpoint_path = auto_checkpoint_path.clone();
                checkpoint_path.push(format!("checkpoint_{current_height}"));
                if let Err(e) = ledger.backup_database(&checkpoint_path) {
                    warn!("Couldn't automatically store a checkpoint at {}: {e}", checkpoint_path.display());
                    continue;
                }
                last_checkpoint_height = Some(current_height);

                // Immediately procure and copy the applicable block tree in the background.
                let ledger_clone = ledger.clone();
                let source_block_tree_path = block_tree_path.clone();
                tokio::spawn(async move {
                    if let Err(e) = ledger_clone.cache_block_tree() {
                        warn!("Couldn't cache the block tree for a ledger checkpoint: {e}");
                        return;
                    }

                    // Copy the block tree file to the new checkpoint.
                    checkpoint_path.push("block_tree");
                    if let Err(e) = fs::copy(source_block_tree_path, checkpoint_path) {
                        warn!("Couldn't copy the block tree file to a ledger checkpoint: {e}");
                    }
                });

                // Count the existing auto checkpoints.
                existing_checkpoints.clear();
                let checkpoint_dir = match auto_checkpoint_path.read_dir() {
                    Ok(dir) => dir,
                    Err(e) => {
                        warn!("IO error while accessing the automatic checkpoints: {e}");
                        continue;
                    }
                };
                for entry in checkpoint_dir {
                    // Handle possible IO errors.
                    let entry = match entry {
                        Ok(entry) => entry,
                        Err(e) => {
                            warn!("IO error while counting the automatic checkpoints: {e}");
                            continue;
                        }
                    };

                    // Skip non-directories.
                    let path = entry.path();
                    if !path.is_dir() {
                        continue;
                    }

                    // Recognize checkpoints by the "checkpoint_height" name.
                    let file_name = entry.file_name().into_string().unwrap(); // can't fail - we create Unicode filenames
                    let mut name_iter = file_name.split("_");
                    if name_iter.next() != Some("checkpoint") {
                        continue;
                    }
                    let Some(height) = name_iter.next() else {
                        continue;
                    };
                    let Ok(height) = u32::from_str(height) else {
                        continue;
                    };
                    existing_checkpoints.push((path, height));
                }
                existing_checkpoints.sort_unstable_by_key(|(_, height)| cmp::Reverse(*height));

                // If we have a sufficient number of checkpoints, delete the oldest one(s).
                let surplus_checkpoints = existing_checkpoints.len().saturating_sub(MAX_AUTO_CHECKPOINTS);
                for _ in 0..surplus_checkpoints {
                    if let Some((checkpoint_path, _)) = existing_checkpoints.pop() {
                        if let Err(e) = fs::remove_dir_all(checkpoint_path) {
                            warn!("Couldn't remove an automatic ledger checkpoint: {e}");
                        }
                    }
                }
            }
        });

        Ok(Some(handle))
    }
}

#[cfg(test)]
mod tests {
    use super::existing_startup_checkpoint_height;
    use std::{
        fs,
        time::{SystemTime, UNIX_EPOCH},
    };

    #[test]
    fn seeds_last_checkpoint_height_when_startup_checkpoint_directory_exists() {
        let startup_height = 42;
        let unique = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_nanos();
        let base_path = std::env::temp_dir().join(format!("snarkos_checkpoint_seed_test_{unique}"));
        let checkpoint_path = base_path.join(format!("checkpoint_{startup_height}"));
        fs::create_dir_all(&checkpoint_path).unwrap();

        let seeded_height = existing_startup_checkpoint_height(base_path.as_path(), startup_height);
        assert_eq!(seeded_height, Some(startup_height));

        fs::remove_dir_all(base_path).unwrap();
    }

    #[test]
    fn does_not_seed_last_checkpoint_height_when_startup_checkpoint_directory_missing() {
        let startup_height = 42;
        let unique = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_nanos();
        let base_path = std::env::temp_dir().join(format!("snarkos_checkpoint_seed_test_{unique}"));
        fs::create_dir_all(&base_path).unwrap();

        let seeded_height = existing_startup_checkpoint_height(base_path.as_path(), startup_height);
        assert_eq!(seeded_height, None);

        fs::remove_dir_all(base_path).unwrap();
    }
}