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👋 I see @joostjager was un-assigned. |
tankyleo
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Jul 17, 2025
lightning/src/ln/channelmanager.rs
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| let new_feerate = commitment_sat_per_1000_weight_for_type(&self.fee_estimator, chan.funding.get_channel_type()); | ||
| let chan_needs_persist = self.update_channel_fee(chan_id, chan, new_feerate); | ||
| let channel_type = chan.funding.get_channel_type(); | ||
| let new_feerate = feerate_cache.entry(channel_type.clone()).or_insert( |
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Would you consider using this snippet below to clone once for each channel type, instead of cloning for every channel ?
let new_feerate = match feerate_cache.get(channel_type) {
Some(feerate) => {
*feerate
}
None => {
let feerate = selected_commitment_sat_per_1000_weight(&self.fee_estimator, &channel_type);
feerate_cache.insert(channel_type.clone(), feerate);
feerate
}
};
Contributor
There was a problem hiding this comment.
Cleaned it up some more below:
let new_feerate = feerate_cache.get(channel_type).copied().or_else(|| {
let feerate = selected_commitment_sat_per_1000_weight(&self.fee_estimator, &channel_type);
feerate_cache.insert(channel_type.clone(), feerate);
Some(feerate)
}).unwrap();
Add a cache by channel type for the cases where we're updating many channels at a time, to minimize calls to the fee estimator. We can't move this check out of the loop without duplicating the logic in holder_preferred_commitment_sat_per_1000_weight_for_type, so we settle for a cache to prevent duplicate queries.
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tankyleo
approved these changes
Jul 17, 2025
elnosh
approved these changes
Jul 18, 2025
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@tankyleo do you think we need another reviewer or is this simple enough to land as-is? |
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#3884 followups