reth_network/transactions/constants.rs
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/* ==================== BROADCAST ==================== */
/// Soft limit for the number of hashes in a
/// [`NewPooledTransactionHashes`](reth_eth_wire::NewPooledTransactionHashes) broadcast message.
///
/// Spec'd at 4096 hashes.
///
/// <https://github.com/ethereum/devp2p/blob/master/caps/eth.md#newpooledtransactionhashes-0x08>
pub const SOFT_LIMIT_COUNT_HASHES_IN_NEW_POOLED_TRANSACTIONS_BROADCAST_MESSAGE: usize = 4096;
/// Default soft limit for the byte size of a [`Transactions`](reth_eth_wire::Transactions)
/// broadcast message.
///
/// Default is 128 KiB.
pub const DEFAULT_SOFT_LIMIT_BYTE_SIZE_TRANSACTIONS_BROADCAST_MESSAGE: usize = 128 * 1024;
/* ================ REQUEST-RESPONSE ================ */
/// Recommended soft limit for the number of hashes in a
/// [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions) request.
///
/// Spec'd at 256 hashes (8 KiB).
///
/// <https://github.com/ethereum/devp2p/blob/master/caps/eth.md#getpooledtransactions-0x09>
pub const SOFT_LIMIT_COUNT_HASHES_IN_GET_POOLED_TRANSACTIONS_REQUEST: usize = 256;
/// Soft limit for the byte size of a [`PooledTransactions`](reth_eth_wire::PooledTransactions)
/// response on assembling a [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions)
/// request.
///
/// Spec'd at 2 MiB.
///
/// <https://github.com/ethereum/devp2p/blob/master/caps/eth.md#protocol-messages>.
pub const SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESPONSE: usize = 2 * 1024 * 1024;
/// Constants used by [`TransactionsManager`](super::TransactionsManager).
pub mod tx_manager {
use super::SOFT_LIMIT_COUNT_HASHES_IN_NEW_POOLED_TRANSACTIONS_BROADCAST_MESSAGE;
/// Default limit for number of transactions to keep track of for a single peer.
///
/// Default is 320 transaction hashes.
pub const DEFAULT_MAX_COUNT_TRANSACTIONS_SEEN_BY_PEER: u32 = 10 * 1024 / 32;
/// Default maximum pending pool imports to tolerate.
///
/// Default is equivalent to the number of hashes in one full announcement, which is spec'd at
/// 4096 hashes, so 4096 pending pool imports.
pub const DEFAULT_MAX_COUNT_PENDING_POOL_IMPORTS: usize =
SOFT_LIMIT_COUNT_HASHES_IN_NEW_POOLED_TRANSACTIONS_BROADCAST_MESSAGE;
/// Default limit for number of bad imports to keep track of.
///
/// Default is 100 KiB, i.e. 3 200 transaction hashes.
pub const DEFAULT_MAX_COUNT_BAD_IMPORTS: u32 = 100 * 1024 / 32;
}
/// Constants used by [`TransactionFetcher`](super::TransactionFetcher).
pub mod tx_fetcher {
use crate::transactions::fetcher::TransactionFetcherInfo;
use reth_network_types::peers::config::{
DEFAULT_MAX_COUNT_PEERS_INBOUND, DEFAULT_MAX_COUNT_PEERS_OUTBOUND,
};
use super::{
SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESPONSE,
SOFT_LIMIT_COUNT_HASHES_IN_GET_POOLED_TRANSACTIONS_REQUEST,
SOFT_LIMIT_COUNT_HASHES_IN_NEW_POOLED_TRANSACTIONS_BROADCAST_MESSAGE,
};
/* ============== SCALARS OF MESSAGES ============== */
/// Default soft limit for the byte size of a
/// [`PooledTransactions`](reth_eth_wire::PooledTransactions) response on assembling a
/// [`GetPooledTransactions`](reth_eth_wire::PooledTransactions) request. This defaults to less
/// than the [`SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESPONSE`], at 2 MiB, used when
/// assembling a [`PooledTransactions`](reth_eth_wire::PooledTransactions) response.
///
/// Default is 128 KiB.
pub const DEFAULT_SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESP_ON_PACK_GET_POOLED_TRANSACTIONS_REQ: usize = 128 * 1024;
/* ==================== RETRIES ==================== */
/// Default maximum request retires per [`TxHash`](alloy_primitives::TxHash). Note, this is
/// reset should the [`TxHash`](alloy_primitives::TxHash) re-appear in an announcement after it
/// has been evicted from the hashes pending fetch cache, i.e. the counter is restarted. If
/// this happens, it is likely a very popular transaction, that should and can indeed be
/// fetched hence this behaviour is favourable.
///
/// Default is 2 retries.
pub const DEFAULT_MAX_RETRIES: u8 = 2;
/// Default number of alternative peers to keep track of for each transaction pending fetch. At
/// most [`DEFAULT_MAX_RETRIES`], which defaults to 2 peers, can ever be needed per peer.
///
/// Default is the sum of [`DEFAULT_MAX_RETRIES`] an
/// [`DEFAULT_MARGINAL_COUNT_FALLBACK_PEERS`], which defaults to 1 peer, so 3 peers.
pub const DEFAULT_MAX_COUNT_FALLBACK_PEERS: u8 =
DEFAULT_MAX_RETRIES + DEFAULT_MARGINAL_COUNT_FALLBACK_PEERS;
/// Default marginal on fallback peers. This is the case, since a transaction is only requested
/// once from each individual peer.
///
/// Default is 1 peer.
pub const DEFAULT_MARGINAL_COUNT_FALLBACK_PEERS: u8 = 1;
/* ==================== CONCURRENCY ==================== */
/// Default maximum concurrent [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions)
/// requests.
///
/// Default is the product of [`DEFAULT_MAX_COUNT_CONCURRENT_REQUESTS_PER_PEER`], which
/// defaults to 1 request, and the sum of [`DEFAULT_MAX_COUNT_PEERS_INBOUND`] and
/// [`DEFAULT_MAX_COUNT_PEERS_OUTBOUND`], which default to 30 and 100 peers respectively, so
/// 130 requests.
pub const DEFAULT_MAX_COUNT_CONCURRENT_REQUESTS: u32 =
DEFAULT_MAX_COUNT_PEERS_INBOUND + DEFAULT_MAX_COUNT_PEERS_OUTBOUND;
/// Default maximum number of concurrent
/// [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions)s to allow per peer. This
/// number reflects concurrent requests for different hashes.
///
/// Default is 1 request.
pub const DEFAULT_MAX_COUNT_CONCURRENT_REQUESTS_PER_PEER: u8 = 1;
/* =============== HASHES PENDING FETCH ================ */
/// Default limit for number of transactions waiting for an idle peer to be fetched from.
///
/// Default is 100 times the [`SOFT_LIMIT_COUNT_HASHES_IN_GET_POOLED_TRANSACTIONS_REQUEST`],
/// which defaults to 256 hashes, so 25 600 hashes.
pub const DEFAULT_MAX_CAPACITY_CACHE_PENDING_FETCH: u32 =
100 * SOFT_LIMIT_COUNT_HASHES_IN_GET_POOLED_TRANSACTIONS_REQUEST as u32;
/// Default max size for cache of inflight and pending transactions fetch.
///
/// Default is [`DEFAULT_MAX_CAPACITY_CACHE_PENDING_FETCH`] +
/// [`DEFAULT_MAX_COUNT_INFLIGHT_REQUESTS_ON_FETCH_PENDING_HASHES`], which is 25600 hashes and
/// 65 requests, so it is 25665 hashes.
pub const DEFAULT_MAX_CAPACITY_CACHE_INFLIGHT_AND_PENDING_FETCH: u32 =
DEFAULT_MAX_CAPACITY_CACHE_PENDING_FETCH +
DEFAULT_MAX_COUNT_INFLIGHT_REQUESTS_ON_FETCH_PENDING_HASHES as u32;
/// Default maximum number of hashes pending fetch to tolerate at any time.
///
/// Default is half of [`DEFAULT_MAX_CAPACITY_CACHE_PENDING_FETCH`], which defaults to 25 600
/// hashes, so 12 800 hashes.
pub const DEFAULT_MAX_COUNT_PENDING_FETCH: usize =
DEFAULT_MAX_CAPACITY_CACHE_PENDING_FETCH as usize / 2;
/* ====== LIMITED CAPACITY ON FETCH PENDING HASHES ====== */
/// Default budget for finding an idle fallback peer for any hash pending fetch, when said
/// search is budget constrained.
///
/// Default is a sixth of [`DEFAULT_MAX_COUNT_PENDING_FETCH`], which defaults to 12 800 hashes
/// (the ideal max number of hashes pending fetch), divided by
/// [`DEFAULT_MAX_COUNT_FALLBACK_PEERS`], which defaults to 3 peers (the depth of the search),
/// so a search breadth of 711 lru hashes in the pending hashes cache.
pub const DEFAULT_BUDGET_FIND_IDLE_FALLBACK_PEER: usize =
DEFAULT_MAX_COUNT_PENDING_FETCH / 6 / DEFAULT_MAX_COUNT_FALLBACK_PEERS as usize;
/// Default budget for finding hashes in the intersection of transactions announced by a peer
/// and in the cache of hashes pending fetch, when said search is budget constrained.
///
/// Default is an eight of [`DEFAULT_MAX_COUNT_PENDING_FETCH`], which defaults to 12 800 hashes
/// (the ideal max number of hashes pending fetch), so a search breadth of 1 600 lru hashes in
/// the pending hashes cache.
pub const DEFAULT_BUDGET_FIND_INTERSECTION_ANNOUNCED_BY_PEER_AND_PENDING_FETCH: usize =
DEFAULT_MAX_COUNT_PENDING_FETCH / 8;
/* ====== SCALARS FOR USE ON FETCH PENDING HASHES ====== */
/// Default soft limit for the number of hashes in a
/// [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions) request, when it is filled
/// from hashes pending fetch.
///
/// Default is half of the [`SOFT_LIMIT_COUNT_HASHES_IN_GET_POOLED_TRANSACTIONS_REQUEST`]
/// which by spec is 256 hashes, so 128 hashes.
pub const DEFAULT_SOFT_LIMIT_COUNT_HASHES_IN_GET_POOLED_TRANSACTIONS_REQUEST_ON_FETCH_PENDING_HASHES:
usize = SOFT_LIMIT_COUNT_HASHES_IN_GET_POOLED_TRANSACTIONS_REQUEST / 2;
/// Default soft limit for a [`PooledTransactions`](reth_eth_wire::PooledTransactions) response
/// when it's used as expected response in calibrating the filling of a
/// [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions) request, when the request
/// is filled from hashes pending fetch.
///
/// Default is half of
/// [`DEFAULT_SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESP_ON_PACK_GET_POOLED_TRANSACTIONS_REQ`],
/// which defaults to 128 KiB, so 64 KiB.
pub const DEFAULT_SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESPONSE_ON_FETCH_PENDING_HASHES:
usize =
DEFAULT_SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESP_ON_PACK_GET_POOLED_TRANSACTIONS_REQ /
2;
/// Default max inflight request when fetching pending hashes.
///
/// Default is half of [`DEFAULT_MAX_COUNT_CONCURRENT_REQUESTS`], which defaults to 130
/// requests, so 65 requests.
pub const DEFAULT_MAX_COUNT_INFLIGHT_REQUESTS_ON_FETCH_PENDING_HASHES: usize =
DEFAULT_MAX_COUNT_CONCURRENT_REQUESTS as usize / 2;
/// Default divisor of the max inflight request when calculating search breadth of the search
/// for any idle peer to which to send a request filled with hashes pending fetch. The max
/// inflight requests is configured in [`TransactionFetcherInfo`].
///
/// Default is 3 requests.
pub const DEFAULT_DIVISOR_MAX_COUNT_INFLIGHT_REQUESTS_ON_FIND_IDLE_PEER: usize = 3;
/// Default divisor of the max inflight request when calculating search breadth of the search
/// for the intersection of hashes announced by a peer and hashes pending fetch. The max
/// inflight requests is configured in [`TransactionFetcherInfo`].
///
/// Default is 3 requests.
pub const DEFAULT_DIVISOR_MAX_COUNT_INFLIGHT_REQUESTS_ON_FIND_INTERSECTION: usize = 3;
// Default divisor to the max pending pool imports when calculating search breadth of the
/// search for any idle peer to which to send a request filled with hashes pending fetch.
/// The max pending pool imports is configured in
/// [`PendingPoolImportsInfo`](crate::transactions::PendingPoolImportsInfo).
///
/// Default is 4 requests.
pub const DEFAULT_DIVISOR_MAX_COUNT_PENDING_POOL_IMPORTS_ON_FIND_IDLE_PEER: usize = 4;
/// Default divisor to the max pending pool imports when calculating search breadth of the
/// search for any idle peer to which to send a request filled with hashes pending fetch.
/// The max pending pool imports is configured in
/// [`PendingPoolImportsInfo`](crate::transactions::PendingPoolImportsInfo).
///
/// Default is 4 requests.
pub const DEFAULT_DIVISOR_MAX_COUNT_PENDING_POOL_IMPORTS_ON_FIND_INTERSECTION: usize = 4;
/* ================== ROUGH MEASURES ================== */
/// Average byte size of an encoded transaction.
///
/// Default is [`SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESPONSE`], which defaults to 2 MiB,
/// divided by [`SOFT_LIMIT_COUNT_HASHES_IN_NEW_POOLED_TRANSACTIONS_BROADCAST_MESSAGE`], which
/// is spec'd at 4096 hashes, so 521 bytes.
pub const AVERAGE_BYTE_SIZE_TX_ENCODED: usize =
SOFT_LIMIT_BYTE_SIZE_POOLED_TRANSACTIONS_RESPONSE /
SOFT_LIMIT_COUNT_HASHES_IN_NEW_POOLED_TRANSACTIONS_BROADCAST_MESSAGE;
/// Median observed size in bytes of a small encoded legacy transaction.
///
/// Default is 120 bytes.
pub const MEDIAN_BYTE_SIZE_SMALL_LEGACY_TX_ENCODED: usize = 120;
/// Marginal on the number of hashes to preallocate memory for in a
/// [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions) request, when packed
/// according to the [`Eth68`](reth_eth_wire::EthVersion::Eth68) protocol version. To make
/// sure enough memory is preallocated in most cases, it's sensible to use a margin. This,
/// since the capacity is calculated based on median value
/// [`MEDIAN_BYTE_SIZE_SMALL_LEGACY_TX_ENCODED`]. There may otherwise be a noteworthy number of
/// cases where just 1 or 2 bytes too little memory is preallocated.
///
/// Default is 8 hashes.
pub const DEFAULT_MARGINAL_COUNT_HASHES_GET_POOLED_TRANSACTIONS_REQUEST: usize = 8;
/// Returns the approx number of transaction hashes that a
/// [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions) request will have capacity
/// for w.r.t. the [`Eth68`](reth_eth_wire::EthVersion::Eth68) protocol version. This is useful
/// for preallocating memory.
pub const fn approx_capacity_get_pooled_transactions_req_eth68(
info: &TransactionFetcherInfo,
) -> usize {
let max_size_expected_response =
info.soft_limit_byte_size_pooled_transactions_response_on_pack_request;
max_size_expected_response / MEDIAN_BYTE_SIZE_SMALL_LEGACY_TX_ENCODED +
DEFAULT_MARGINAL_COUNT_HASHES_GET_POOLED_TRANSACTIONS_REQUEST
}
/// Returns the approx number of transactions that a
/// [`GetPooledTransactions`](reth_eth_wire::GetPooledTransactions) request will
/// have capacity for w.r.t. the [`Eth66`](reth_eth_wire::EthVersion::Eth66) protocol version.
/// This is useful for preallocating memory.
pub const fn approx_capacity_get_pooled_transactions_req_eth66() -> usize {
SOFT_LIMIT_COUNT_HASHES_IN_GET_POOLED_TRANSACTIONS_REQUEST
}
}