161 lines
3.8 KiB
Rust
161 lines
3.8 KiB
Rust
use util::*;
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/// Type for a 2048-bit log-bloom, as used by our blocks.
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pub type LogBloom = H2048;
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/// Constant address for point 0. Often used as a default.
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pub static ZERO_ADDRESS: Address = Address([0x00; 20]);
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/// Constant 256-bit datum for 0. Often used as a default.
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pub static ZERO_H256: H256 = H256([0x00; 32]);
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/// Constant 2048-bit datum for 0. Often used as a default.
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pub static ZERO_LOGBLOOM: LogBloom = H2048([0x00; 256]);
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/// A block header.
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///
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/// Reflects the specific RLP fields of a block in the chain with additional room for the seal
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/// which is non-specific.
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///
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/// Doesn't do all that much on its own.
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#[derive(Debug)]
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pub struct Header {
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pub parent_hash: H256,
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pub timestamp: U256,
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pub number: U256,
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pub author: Address,
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pub transactions_root: H256,
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pub uncles_hash: H256,
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pub extra_data: Bytes,
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pub state_root: H256,
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pub receipts_root: H256,
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pub log_bloom: LogBloom,
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pub gas_used: U256,
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pub gas_limit: U256,
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pub difficulty: U256,
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pub seal: Vec<Bytes>,
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pub hash: RefCell<Option<H256>>, //TODO: make this private
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}
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impl Header {
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/// Create a new, default-valued, header.
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pub fn new() -> Header {
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Header {
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parent_hash: ZERO_H256.clone(),
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timestamp: BAD_U256.clone(),
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number: ZERO_U256.clone(),
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author: ZERO_ADDRESS.clone(),
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transactions_root: ZERO_H256.clone(),
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uncles_hash: ZERO_H256.clone(),
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extra_data: vec![],
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state_root: ZERO_H256.clone(),
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receipts_root: ZERO_H256.clone(),
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log_bloom: ZERO_LOGBLOOM.clone(),
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gas_used: ZERO_U256.clone(),
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gas_limit: ZERO_U256.clone(),
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difficulty: ZERO_U256.clone(),
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seal: vec![],
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hash: RefCell::new(None),
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}
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}
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pub fn hash(&self) -> H256 {
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let mut hash = self.hash.borrow_mut();
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match &mut *hash {
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&mut Some(ref h) => h.clone(),
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hash @ &mut None => {
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let mut stream = RlpStream::new();
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stream.append(self);
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let h = stream.as_raw().sha3();
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*hash = Some(h.clone());
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h.clone()
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}
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}
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}
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}
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impl Decodable for Header {
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fn decode<D>(decoder: &D) -> Result<Self, DecoderError> where D: Decoder {
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let d = try!(decoder.as_list());
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let mut blockheader = Header {
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parent_hash: try!(Decodable::decode(&d[0])),
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uncles_hash: try!(Decodable::decode(&d[1])),
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author: try!(Decodable::decode(&d[2])),
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state_root: try!(Decodable::decode(&d[3])),
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transactions_root: try!(Decodable::decode(&d[4])),
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receipts_root: try!(Decodable::decode(&d[5])),
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log_bloom: try!(Decodable::decode(&d[6])),
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difficulty: try!(Decodable::decode(&d[7])),
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number: try!(Decodable::decode(&d[8])),
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gas_limit: try!(Decodable::decode(&d[9])),
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gas_used: try!(Decodable::decode(&d[10])),
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timestamp: try!(Decodable::decode(&d[11])),
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extra_data: try!(Decodable::decode(&d[12])),
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seal: vec![],
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hash: RefCell::new(None),
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};
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for i in 13..d.len() {
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blockheader.seal.push(d[i].as_raw().to_vec());
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}
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Ok(blockheader)
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}
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}
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impl Encodable for Header {
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fn encode<E>(&self, encoder: &mut E) where E: Encoder {
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encoder.emit_list(| e | {
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self.parent_hash.encode(e);
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self.uncles_hash.encode(e);
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self.author.encode(e);
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self.state_root.encode(e);
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self.transactions_root.encode(e);
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self.receipts_root.encode(e);
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self.log_bloom.encode(e);
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self.difficulty.encode(e);
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self.number.encode(e);
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self.gas_limit.encode(e);
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self.gas_used.encode(e);
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self.timestamp.encode(e);
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self.extra_data.encode(e);
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for b in self.seal.iter() {
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e.emit_raw(&b);
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}
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})
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}
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}
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/*
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trait RlpStandard {
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fn append(&self, s: &mut RlpStream);
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}
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impl RlpStandard for Header {
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fn append(&self, s: &mut RlpStream) {
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s.append_list(13);
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s.append(self.parent_hash);
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s.append_raw(self.seal[0]);
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s.append_standard(self.x);
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}
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fn populate(&mut self, s: &Rlp) {
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}
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}
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impl RlpStream {
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fn append_standard<O>(&mut self, o: &O) where O: RlpStandard {
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o.append(self);
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}
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}
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*/
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#[cfg(test)]
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mod tests {
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}
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