tip-5.md

tip	title	author	created	status	type	category
5	The model of generate FruitsHash	WenTao WU <wuwentao@truechain.pro>	2019-06-11	Draft	Standards Track	Core

Abstract

This draft TIP describes the model of generate fruitsHash

Motivation

make this change is in order to verify fruits more lightweight in lightchain and snapshot.

Specification

In order to achieve the specs, The current processing mode needs to be modified.

• the current processing mode is when create fruitsHash it uses allfruits include bodies and headers.
• in this change we just need all headers.

Implementation

current processing mode:

if len(fruits) == 0 {
		b.header.FruitsHash = EmptyRootHash
	} else {
		b.header.FruitsHash = DeriveSha(Fruits(fruits))
		b.fruits = make([]*SnailBlock, len(fruits))
		for i := range fruits {
			b.fruits[i] = CopyFruit(fruits[i])
		}
	}

modified processing mode:

if len(fruits) == 0 {
		b.header.FruitsHash = EmptyRootHash
	} else {
		b.fruits = make([]*SnailBlock, len(fruits))
		var headers []*SnailHeader
		for i := range fruits {
			b.fruits[i] = CopyFruit(fruits[i])
			headers = append(headers, fruits[i].header)
		}
		if config.IsTIP5(header.Number) {
			b.header.FruitsHash = DeriveSha(FruitsHeaders(headers))
		} else {
			b.header.FruitsHash = DeriveSha(Fruits(fruits))
		}
	}

1. /~https://github.com/truechain/truechain-engineering-code/blob/master/core/types/block.go