feat: support getting withdrawal proof on pbss #74
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Description
This PR proposes a solution that makes it possible to obtain proof of withdrawal in PBSS.
NodeBufferList consists of a NodeCache list and a BaseNodeBuffer. A NodeCache is used to store the diffLayers committed. The diffLayers in one NodeCache is limited to 1800. When a NodeCache is full, another new NodeCache is initialized and placed at the top of the list. In the background, the NodeCache from the end of the list is regularly inserted into the BaseNodeBuffer. When the BaseNodeBuffer reaches 256M, it will be flushed to the backend database. There are at least two NodeCaches in the list, which ensure that there are at least 3600 diffLayers in the memory.
Rationale
PBSS can only support the world state of the recent last 129 (128 difflayers + 1 disklayer) blocks’ state data; while getting withdrawal proof needs the world state of the last block divisible by 3600, which MUST be kept.
Example
If you want to use nodebufferlist, you can use the
--pathdb.nodebuffer listflag.--pathdb.nodebufferis set type of trienodebuffer to cache trie nodes in disklayer('list', 'sync', or 'async'), which default is async. async is double nodebuffer for flushing db in background. sync is the community’s native nodebuffer, which block flushing db.--pathdb.syncChanges
Notable changes: