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feat: add estimate_fee_rate rpc #4465

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@quake quake commented May 20, 2024

What problem does this PR solve?

resolve #3673

What is changed and how it works?

Since CKB transaction confirmation involves a two-step process: 1) propose and 2) commit, it is complex to predict the transaction fee accurately with the expectation that it will be included within a certain block height.

This PR relies on two assumptions and uses a simple strategy to estimate the transaction fee: 1) all transactions in the pool are waiting to be proposed, and 2) no new transactions will be added to the pool. In practice, this simple method should achieve good accuracy fee rate and running performance.

The rpc parameter target_to_be_committed is limited to 3~131, because the minimum value of the proposal window is 2, which is equivalent to predicting the height of current_tip + 1 ~ 128.

Check List

Tests

  • Unit test
  • Integration test

Release note

Title Only: Include only the PR title in the release note.

@quake quake requested a review from a team as a code owner May 20, 2024 04:24
@quake quake requested review from zhangsoledad, chenyukang and eval-exec and removed request for a team May 20, 2024 04:24

###### Params

* `target_to_be_committed` - The target block number to be committed, minimum value is 3 and maximum value is 131.
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The rpc parameter target_to_be_committed is limited to 3~131, because the minimum value of the proposal window is 2, which is equivalent to predicting the height of current_tip + 1 ~ 128.

128+2=130

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Improved support for transaction fee estimation
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