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//! User-configurable mempool parameters.
use std::time::Duration;
use serde::{Deserialize, Serialize};
/// Mempool configuration section.
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
#[serde(deny_unknown_fields, default)]
pub struct Config {
/// The mempool transaction cost limit.
///
/// This limits the total serialized byte size of all transactions in the mempool.
///
/// Consensus rule:
/// > There MUST be a configuration option mempooltxcostlimit, which SHOULD default to 80000000.
///
/// This corresponds to `mempooltxcostlimit` from [ZIP-401](https://zips.z.cash/zip-0401#specification).
pub tx_cost_limit: u64,
/// The mempool transaction eviction age limit.
///
/// This limits the maximum amount of time evicted transaction IDs stay in
/// the mempool rejection list. Transactions are randomly evicted from the
/// mempool when the mempool reaches [`Self::tx_cost_limit`].
///
/// (Transactions can also be rejected by the mempool for other reasons.
/// Different rejection reasons can have different age limits.)
///
/// This corresponds to `mempoolevictionmemoryminutes` from
/// [ZIP-401](https://zips.z.cash/zip-0401#specification).
#[serde(with = "humantime_serde")]
pub eviction_memory_time: Duration,
/// If the state's best chain tip has reached this height, always enable the mempool,
/// regardless of Zebra's sync status.
///
/// Set to `None` by default: Zebra always checks the sync status before enabling the mempool.
//
// TODO:
// - allow the mempool to be enabled before the genesis block is committed?
// we could replace `Option` with an enum that has an `AlwaysEnable` variant
pub debug_enable_at_height: Option<u32>,
/// Maximum size in bytes of an OP_RETURN script that is considered standard.
///
/// If unset, defaults to [`DEFAULT_MAX_DATACARRIER_BYTES`]. This size includes the OP_RETURN
/// opcode and pushdata overhead. Matches zcashd's `-datacarriersize` default behavior.
pub max_datacarrier_bytes: Option<u32>,
}
impl Default for Config {
fn default() -> Self {
Self {
// [ZIP-401] Consensus rules:
//
// > There MUST be a configuration option mempooltxcostlimit,
// > which SHOULD default to 80000000.
// >
// > There MUST be a configuration option mempoolevictionmemoryminutes,
// > which SHOULD default to 60 [minutes].
//
// [ZIP-401]: https://zips.z.cash/zip-0401#specification
tx_cost_limit: 80_000_000,
eviction_memory_time: Duration::from_secs(60 * 60),
debug_enable_at_height: None,
max_datacarrier_bytes: Some(DEFAULT_MAX_DATACARRIER_BYTES),
}
}
}
/// Default maximum size of data carrier scripts (OP_RETURN), in bytes.
///
/// Equivalent to zcashd's `MAX_OP_RETURN_RELAY`:
/// <https://github.com/zcash/zcash/blob/v6.10.0/src/script/standard.h#L22-L26>
pub const DEFAULT_MAX_DATACARRIER_BYTES: u32 = 83;