Move around impls in block module
So that an impl always succeeds the struct type definition.
This commit is contained in:
Steven Roose
parent
71bf8d7bcf
commit
29a74a14ab
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@ -51,96 +51,8 @@ pub struct BlockHeader {
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pub nonce: u32,
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}
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/// A Bitcoin block, which is a collection of transactions with an attached
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/// proof of work.
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#[derive(PartialEq, Eq, Clone, Debug)]
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pub struct Block {
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/// The block header
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pub header: BlockHeader,
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/// List of transactions contained in the block
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pub txdata: Vec<Transaction>
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}
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impl Block {
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/// Return the block hash.
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pub fn block_hash(&self) -> BlockHash {
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self.header.block_hash()
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}
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/// check if merkle root of header matches merkle root of the transaction list
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pub fn check_merkle_root (&self) -> bool {
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self.header.merkle_root == self.merkle_root()
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}
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/// check if witness commitment in coinbase is matching the transaction list
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pub fn check_witness_commitment(&self) -> bool {
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// witness commitment is optional if there are no transactions using SegWit in the block
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if self.txdata.iter().all(|t| t.input.iter().all(|i| i.witness.is_empty())) {
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return true;
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}
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if !self.txdata.is_empty() {
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let coinbase = &self.txdata[0];
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if coinbase.is_coin_base() {
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// commitment is in the last output that starts with below magic
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if let Some(pos) = coinbase.output.iter()
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.rposition(|o| {
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o.script_pubkey.len () >= 38 &&
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o.script_pubkey[0..6] == [0x6a, 0x24, 0xaa, 0x21, 0xa9, 0xed] }) {
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let commitment = WitnessCommitment::from_slice(&coinbase.output[pos].script_pubkey.as_bytes()[6..38]).unwrap();
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// witness reserved value is in coinbase input witness
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if coinbase.input[0].witness.len() == 1 && coinbase.input[0].witness[0].len() == 32 {
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let witness_root = self.witness_root();
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return commitment == Self::compute_witness_commitment(&witness_root, coinbase.input[0].witness[0].as_slice())
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}
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}
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}
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}
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false
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}
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/// Calculate the transaction merkle root.
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pub fn merkle_root(&self) -> TxMerkleNode {
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let hashes = self.txdata.iter().map(|obj| obj.txid().as_hash());
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bitcoin_merkle_root(hashes).into()
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}
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/// compute witness commitment for the transaction list
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pub fn compute_witness_commitment (witness_root: &WitnessMerkleNode, witness_reserved_value: &[u8]) -> WitnessCommitment {
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let mut encoder = WitnessCommitment::engine();
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witness_root.consensus_encode(&mut encoder).unwrap();
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encoder.input(witness_reserved_value);
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WitnessCommitment::from_engine(encoder)
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}
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/// Merkle root of transactions hashed for witness
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pub fn witness_root(&self) -> WitnessMerkleNode {
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let hashes = self.txdata.iter().enumerate().map(|(i, t)|
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if i == 0 {
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// Replace the first hash with zeroes.
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Wtxid::default().as_hash()
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} else {
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t.wtxid().as_hash()
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}
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);
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bitcoin_merkle_root(hashes).into()
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}
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/// Get the size of the block
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pub fn get_size(&self) -> usize {
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// The size of the header + the size of the varint with the tx count + the txs themselves
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let base_size = 80 + VarInt(self.txdata.len() as u64).len();
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let txs_size: usize = self.txdata.iter().map(Transaction::get_size).sum();
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base_size + txs_size
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}
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/// Get the weight of the block
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pub fn get_weight(&self) -> usize {
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let base_weight = WITNESS_SCALE_FACTOR * (80 + VarInt(self.txdata.len() as u64).len());
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let txs_weight: usize = self.txdata.iter().map(Transaction::get_weight).sum();
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base_weight + txs_weight
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}
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}
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impl_consensus_encoding!(BlockHeader, version, prev_blockhash, merkle_root, time, bits, nonce);
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serde_struct_impl!(BlockHeader, version, prev_blockhash, merkle_root, time, bits, nonce);
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impl BlockHeader {
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/// Return the block hash.
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@ -238,11 +150,100 @@ impl BlockHeader {
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}
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}
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impl_consensus_encoding!(BlockHeader, version, prev_blockhash, merkle_root, time, bits, nonce);
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/// A Bitcoin block, which is a collection of transactions with an attached
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/// proof of work.
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#[derive(PartialEq, Eq, Clone, Debug)]
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pub struct Block {
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/// The block header
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pub header: BlockHeader,
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/// List of transactions contained in the block
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pub txdata: Vec<Transaction>
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}
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impl_consensus_encoding!(Block, header, txdata);
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serde_struct_impl!(BlockHeader, version, prev_blockhash, merkle_root, time, bits, nonce);
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serde_struct_impl!(Block, header, txdata);
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impl Block {
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/// Return the block hash.
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pub fn block_hash(&self) -> BlockHash {
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self.header.block_hash()
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}
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/// check if merkle root of header matches merkle root of the transaction list
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pub fn check_merkle_root (&self) -> bool {
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self.header.merkle_root == self.merkle_root()
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}
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/// check if witness commitment in coinbase is matching the transaction list
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pub fn check_witness_commitment(&self) -> bool {
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// witness commitment is optional if there are no transactions using SegWit in the block
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if self.txdata.iter().all(|t| t.input.iter().all(|i| i.witness.is_empty())) {
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return true;
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}
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if !self.txdata.is_empty() {
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let coinbase = &self.txdata[0];
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if coinbase.is_coin_base() {
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// commitment is in the last output that starts with below magic
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if let Some(pos) = coinbase.output.iter()
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.rposition(|o| {
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o.script_pubkey.len () >= 38 &&
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o.script_pubkey[0..6] == [0x6a, 0x24, 0xaa, 0x21, 0xa9, 0xed] }) {
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let commitment = WitnessCommitment::from_slice(&coinbase.output[pos].script_pubkey.as_bytes()[6..38]).unwrap();
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// witness reserved value is in coinbase input witness
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if coinbase.input[0].witness.len() == 1 && coinbase.input[0].witness[0].len() == 32 {
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let witness_root = self.witness_root();
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return commitment == Self::compute_witness_commitment(&witness_root, coinbase.input[0].witness[0].as_slice())
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}
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}
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}
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}
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false
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}
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/// Calculate the transaction merkle root.
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pub fn merkle_root(&self) -> TxMerkleNode {
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let hashes = self.txdata.iter().map(|obj| obj.txid().as_hash());
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bitcoin_merkle_root(hashes).into()
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}
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/// compute witness commitment for the transaction list
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pub fn compute_witness_commitment (witness_root: &WitnessMerkleNode, witness_reserved_value: &[u8]) -> WitnessCommitment {
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let mut encoder = WitnessCommitment::engine();
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witness_root.consensus_encode(&mut encoder).unwrap();
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encoder.input(witness_reserved_value);
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WitnessCommitment::from_engine(encoder)
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}
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/// Merkle root of transactions hashed for witness
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pub fn witness_root(&self) -> WitnessMerkleNode {
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let hashes = self.txdata.iter().enumerate().map(|(i, t)|
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if i == 0 {
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// Replace the first hash with zeroes.
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Wtxid::default().as_hash()
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} else {
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t.wtxid().as_hash()
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}
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);
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bitcoin_merkle_root(hashes).into()
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}
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/// Get the size of the block
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pub fn get_size(&self) -> usize {
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// The size of the header + the size of the varint with the tx count + the txs themselves
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let base_size = 80 + VarInt(self.txdata.len() as u64).len();
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let txs_size: usize = self.txdata.iter().map(Transaction::get_size).sum();
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base_size + txs_size
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}
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/// Get the weight of the block
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pub fn get_weight(&self) -> usize {
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let base_weight = WITNESS_SCALE_FACTOR * (80 + VarInt(self.txdata.len() as u64).len());
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let txs_weight: usize = self.txdata.iter().map(Transaction::get_weight).sum();
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base_weight + txs_weight
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}
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}
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#[cfg(test)]
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mod tests {
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use hashes::hex::FromHex;
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