This commit introduces a filterManager that uses our outbound peers'
feefilter values to determine an acceptable minimum feerate that
ensures successful transaction propagation. Under the hood, a moving
median is used as it is more resistant to shocks than a moving average.
Bitcoind will not report any fee estimation in case it has not
enough data available. We used to just set the min mempool fee
in such cases but this might not represent the current fee situation
of the bitcoin network. We return an error now so that we will use
the fallback fee instead.
This commit removes the interface methods `GenQueryURL` and
`ParseResponse` so the `WebAPIEstimator` can care less about the
implementation details of this interface.
This commit adds a new method `GetFeeMap` to handle querying the web API
and parse the response into a map that's used by the fee estimator. In
doing so we can provide a deeper abstraction over the `WebAPIFeeSource`
interface.
This commit was previously split into the following parts to ease
review:
- 2d746f68: replace imports
- 4008f0fd: use ecdsa.Signature
- 849e33d1: remove btcec.S256()
- b8f6ebbd: use v2 library correctly
- fa80bca9: bump go modules
This commit adds a fetchMinMempoolFee function to the BitcoindEstimator
that fetches the current min mempool fee from the bitcoind backend. The
commit then also updates the BitcoindEstimator to use a minFeeManager
for it's minFeeManager member and uses the fetchMinMempoolFee function
to initialise this.
In this commit, we add a check inside EstimateFeePerKW for bitcoind so
that when the conf target exceeds the maxBlockTarget, we will use
maxBlockTarget instead.
In this commit, we create a new chainfee package, that houses all fee
related functionality used within the codebase. The creation of this new
package furthers our long-term goal of extracting functionality from the
bloated `lnwallet` package into new distinct packages. Additionally,
this new packages resolves a class of import cycle that could arise if a
new package that was imported by something in `lnwallet` wanted to use
the existing fee related functions in the prior `lnwallet` package.
