EVM-660 Use batch write inside blockchain.go (LevelDB/memory)

[jelacamarko]

Description

• In the previous implementation, WriteFullBlock and other methods of Blockchain structure wrote each part of the block separately. However, with the changes introduced in this PR, everything is written together as a single batch. This can improve performance and efficiency when writing data
• The KeyValueStorage is focused on read operations only + it provides a method [func (s *KeyValueStorage) NewBatch() Batch ] to create a concrete implementation of a Batch (memory or LevelDB)
• The actual writing is handled by the BatchWriter, which holds the concrete Batch interface implementation. It contains methods such as PutHeadHash or PutHeadNumber etc that are putting desired changes into a batch queue. However, these methods do not immediately change the storage. The changes are only saved to the actual database or memory when the WriteBatch method is called.

LevelDB options that are changed:

OpenFilesCacheCapacity = DefaultHandles
BlockCacheCapacity = DefaultCache / 2 * opt.MiB
WriteBuffer = DefaultCache / 4 * opt.MiB

LevelDB options are set to the same values that go-ethereum uses.

DefaultHandles = 256
DefaultCache = 256

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

Manual tests

Please complete this section if you ran manual tests for this functionality, otherwise delete it

Documentation update

Please link the documentation update PR in this section if it's present, otherwise delete it

Additional comments

Please post additional comments in this section if you have them, otherwise delete it

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[Stefan-Ethernal]

It would be probably interesting to implement some benchmark tests and see how much gain we get by using batch updates.

[goran-ethernal]

Except from the small comments, looks good.

[vcastellm]

LGTM this should bring great improvement.