// AddBlock write the block into blocks bucket, add the pair of block hash and pre block hash into
// tree in the block depth.
func (bt *BlockTree) AddBlock(b *coin.Block) error {
return UpdateTx(func(tx *bolt.Tx) error {
blocks := tx.Bucket(bt.blocks.Name)
// can't store block if it's not genesis block and has no parent.
if b.Seq() > 0 && b.PreHashHeader() == emptyHash {
return errNoParent
}
// check if the block already exist.
hash := b.HashHeader()
if blk := blocks.Get(hash[:]); blk != nil {
return errBlockExist
}
// write block into blocks bucket.
if err := setBlock(blocks, b); err != nil {
return err
}
// get tree bucket.
tree := tx.Bucket(bt.tree.Name)
// the pre hash must be in depth - 1.
if b.Seq() > 0 {
preHash := b.PreHashHeader()
parentHashPair, err := getHashPairInDepth(tree, b.Seq()-1, func(hp coin.HashPair) bool {
return hp.Hash == preHash
})
if err != nil {
return err
}
if len(parentHashPair) == 0 {
return errWrongParent
}
}
hp := coin.HashPair{hash, b.Head.PrevHash}
// get block pairs in the depth
hashPairs, err := getHashPairInDepth(tree, b.Seq(), allPairs)
if err != nil {
return err
}
if len(hashPairs) == 0 {
// no hash pair exist in the depth.
// write the hash pair into tree.
return setHashPairInDepth(tree, b.Seq(), []coin.HashPair{hp})
}
// check dup block
if containHash(hashPairs, hp) {
return errBlockExist
}
hashPairs = append(hashPairs, hp)
return setHashPairInDepth(tree, b.Seq(), hashPairs)
})
}
// RemoveBlock remove block from blocks bucket and tree bucket.
// can't remove block if it has children.
func (bt *BlockTree) RemoveBlock(b *coin.Block) error {
return UpdateTx(func(tx *bolt.Tx) error {
// delete block in blocks bucket.
blocks := tx.Bucket(bt.blocks.Name)
hash := b.HashHeader()
if err := blocks.Delete(hash[:]); err != nil {
return err
}
// get tree bucket.
tree := tx.Bucket(bt.tree.Name)
// check if this block has children
has, err := hasChild(tree, *b)
if err != nil {
return err
}
if has {
return errHasChild
}
// get block hash pairs in depth
hashPairs, err := getHashPairInDepth(tree, b.Seq(), func(hp coin.HashPair) bool {
return true
})
if err != nil {
return err
}
// remove block hash pair in tree.
ps := removePairs(hashPairs, coin.HashPair{hash, b.PreHashHeader()})
if len(ps) == 0 {
tree.Delete(itob(b.Seq()))
return nil
}
// update the hash pairs in tree.
return setHashPairInDepth(tree, b.Seq(), ps)
})
}