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fix: don't override user-set 1559 attributes (#1980) 

* fix: don't override user-set 1559 attributes

* fix: enforce cap on prioirity fee per gas
This commit is contained in:
James Prestwich 2022-12-28 20:05:08 -05:00 committed by GitHub
parent 799f752e55
commit e26ede21f1
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1 changed files with 13 additions and 2 deletions
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15
ethers-providers/src/provider.rs
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@ -352,8 +352,19 @@ impl<P: JsonRpcClient> Middleware for Provider<P> {
if inner.max_fee_per_gas.is_none() || inner.max_priority_fee_per_gas.is_none() {
let (max_fee_per_gas, max_priority_fee_per_gas) =
self.estimate_eip1559_fees(None).await?;
inner.max_fee_per_gas = Some(max_fee_per_gas);
inner.max_priority_fee_per_gas = Some(max_priority_fee_per_gas);
// we want to avoid overriding the user if either of these
// are set. In order to do this, we refuse to override the
// `max_fee_per_gas` if already set.
// However, we must preserve the constraint that the tip
// cannot be higher than max fee, so we override user
// intent if that is so. We override by
// - first: if set, set to the min(current value, MFPG)
// - second, if still unset, use the RPC estimated amount
let mfpg = inner.max_fee_per_gas.get_or_insert(max_fee_per_gas);
inner
.max_priority_fee_per_gas
.map(|tip| std::cmp::min(tip, *mfpg))
.get_or_insert(max_priority_fee_per_gas);
};
}
}