This repository contains a PoC of key-value DB checksums based on hashes XORing. It's main purpose is to show that using this approach it's possible to reproduce overall DB state sum from DB changes.
Requires Go 1.12+. Usage:
make test
make cover
The most interesting part is TestCachedStateSimple function that tests
various scenarios of cache and persistence store interactions. Checksum
implementation in MemoryStore always computes full checksum of the database
while Checksum in the MemCachedStore is computed incrementally during Put
and Delete.
This codebase is based on neo-go repository (pkg/core/storage), so it
contains some useless (from a PoC point of view) code, lacks proper locking in
many places and doesn't have proper PutBatch implementation for
MemCachedStore. All of this is just because it's a quick proof of concept, so
don't expect it to be polished.