Struct GasCache 

pub struct GasCache { /* private fields */ }

Cached EIP-1559 gas fees with TTL-based staleness detection.

Updated from block headers (typically via subscription or polling). All methods that check freshness take an explicit now_ms parameter for deterministic testing.

Implementations

impl GasCache

pub fn new(ttl_ms: u64, default_priority_fee: u64) -> Self

Create a new cache.

• ttl_ms: how long cached fees are valid (2000 = 2 Base L2 blocks)
• default_priority_fee: miner tip in wei (e.g. 1_000_000_000 = 1 gwei)

pub fn update(&mut self, base_fee: u64, now_ms: u64)

Update the cache from a new block header’s base fee.

pub fn is_valid(&self, now_ms: u64) -> bool

Check if the cache has valid (non-stale) fees.

pub fn get(&self, now_ms: u64) -> Option<&GasFees>

Get the raw cached fees if still within TTL.

pub fn fees_for(&self, urgency: Urgency, now_ms: u64) -> Option<GasFees>

Compute fees scaled for the given Urgency, or None if stale/empty.

Fee formulas:

• Low: base + priority
• Normal: 2*base + priority
• High: 3*base + 2*priority
• Critical: 4*base + 5*priority

Trait Implementations

impl Debug for GasCache

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.