Golang ShaHash.IsEqual方法代码示例

// BlockLocatorFromHash returns a block locator for the passed block hash.
// See BlockLocator for details on the algotirhm used to create a block locator.
//
// In addition to the general algorithm referenced above, there are a couple of
// special cases which are handled:
//
//  - If the genesis hash is passed, there are no previous hashes to add and
//    therefore the block locator will only consist of the genesis hash
//  - If the passed hash is not currently known, the block locator will only
//    consist of the passed hash
func (b *BlockChain) BlockLocatorFromHash(hash *wire.ShaHash) BlockLocator {
	// The locator contains the requested hash at the very least.
	locator := make(BlockLocator, 0, wire.MaxBlockLocatorsPerMsg)
	locator = append(locator, hash)

	// Nothing more to do if a locator for the genesis hash was requested.
	if hash.IsEqual(b.chainParams.GenesisHash) {
		return locator
	}

	// Attempt to find the height of the block that corresponds to the
	// passed hash, and if it's on a side chain, also find the height at
	// which it forks from the main chain.
	blockHeight := int32(-1)
	forkHeight := int32(-1)
	node, exists := b.index[*hash]
	if !exists {
		// Try to look up the height for passed block hash.  Assume an
		// error means it doesn't exist and just return the locator for
		// the block itself.
		height, err := b.db.FetchBlockHeightBySha(hash)
		if err != nil {
			return locator
		}

		blockHeight = height
	} else {
		blockHeight = node.height

		// Find the height at which this node forks from the main chain
		// if the node is on a side chain.
		if !node.inMainChain {
			for n := node; n.parent != nil; n = n.parent {
				if n.inMainChain {
					forkHeight = n.height
					break
				}
			}
		}
	}

	// Generate the block locators according to the algorithm described in
	// in the BlockLocator comment and make sure to leave room for the
	// final genesis hash.
	iterNode := node
	increment := int32(1)
	for len(locator) < wire.MaxBlockLocatorsPerMsg-1 {
		// Once there are 10 locators, exponentially increase the
		// distance between each block locator.
		if len(locator) > 10 {
			increment *= 2
		}
		blockHeight -= increment
		if blockHeight < 1 {
			break
		}

		// As long as this is still on the side chain, walk backwards
		// along the side chain nodes to each block height.
		if forkHeight != -1 && blockHeight > forkHeight {
			// Intentionally use parent field instead of the
			// getPrevNodeFromNode function since we don't want to
			// dynamically load nodes when building block locators.
			// Side chain blocks should always be in memory already,
			// and if they aren't for some reason it's ok to skip
			// them.
			for iterNode != nil && blockHeight > iterNode.height {
				iterNode = iterNode.parent
			}
			if iterNode != nil && iterNode.height == blockHeight {
				locator = append(locator, iterNode.hash)
			}
			continue
		}

		// The desired block height is in the main chain, so look it up
		// from the main chain database.
		h, err := b.db.FetchBlockShaByHeight(blockHeight)
		if err != nil {
			// This shouldn't happen and it's ok to ignore block
			// locators, so just continue to the next one.
			log.Warnf("Lookup of known valid height failed %v",
				blockHeight)
			continue
		}
		locator = append(locator, h)
	}

	// Append the appropriate genesis block.
	locator = append(locator, b.chainParams.GenesisHash)
//.........这里部分代码省略.........