344 lines
12 KiB
Rust
344 lines
12 KiB
Rust
#![allow(ptr_arg)] // Because of &LastHashes -> &Vec<_>
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use common::*;
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use engine::*;
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use state::*;
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use verification::PreVerifiedBlock;
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/// A transaction/receipt execution entry.
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pub struct Entry {
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transaction: Transaction,
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receipt: Receipt,
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}
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/// Internal type for a block's common elements.
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pub struct Block {
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header: Header,
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/// State is the most final state in the block.
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state: State,
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archive: Vec<Entry>,
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archive_set: HashSet<H256>,
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uncles: Vec<Header>,
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}
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/// A set of references to `Block` fields that are publicly accessible.
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pub struct BlockRefMut<'a> {
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/// TODO [Gav Wood] Please document me
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pub header: &'a Header,
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/// TODO [Gav Wood] Please document me
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pub state: &'a mut State,
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/// TODO [Gav Wood] Please document me
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pub archive: &'a Vec<Entry>,
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/// TODO [Gav Wood] Please document me
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pub uncles: &'a Vec<Header>,
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}
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impl Block {
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/// Create a new block from the given `state`.
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fn new(state: State) -> Block {
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Block {
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header: Header::new(),
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state: state,
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archive: Vec::new(),
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archive_set: HashSet::new(),
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uncles: Vec::new(),
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}
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}
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/// Get a structure containing individual references to all public fields.
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pub fn fields(&mut self) -> BlockRefMut {
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BlockRefMut {
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header: &self.header,
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state: &mut self.state,
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archive: &self.archive,
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uncles: &self.uncles,
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}
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}
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}
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/// Trait for a object that is_a `Block`.
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pub trait IsBlock {
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/// Get the block associated with this object.
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fn block(&self) -> &Block;
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/// Get the header associated with this object's block.
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fn header(&self) -> &Header { &self.block().header }
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/// Get the final state associated with this object's block.
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fn state(&self) -> &State { &self.block().state }
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/// Get all information on transactions in this block.
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fn archive(&self) -> &Vec<Entry> { &self.block().archive }
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/// Get all uncles in this block.
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fn uncles(&self) -> &Vec<Header> { &self.block().uncles }
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}
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impl IsBlock for Block {
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fn block(&self) -> &Block { self }
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}
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/// Block that is ready for transactions to be added.
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///
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/// It's a bit like a Vec<Transaction>, eccept that whenever a transaction is pushed, we execute it and
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/// maintain the system `state()`. We also archive execution receipts in preparation for later block creation.
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pub struct OpenBlock<'x, 'y> {
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block: Block,
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engine: &'x Engine,
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last_hashes: &'y LastHashes,
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}
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/// Just like OpenBlock, except that we've applied `Engine::on_close_block`, finished up the non-seal header fields,
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/// and collected the uncles.
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///
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/// There is no function available to push a transaction. If you want that you'll need to `reopen()` it.
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pub struct ClosedBlock<'x, 'y> {
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open_block: OpenBlock<'x, 'y>,
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uncle_bytes: Bytes,
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}
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/// A block that has a valid seal.
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///
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/// The block's header has valid seal arguments. The block cannot be reversed into a ClosedBlock or OpenBlock.
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pub struct SealedBlock {
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block: Block,
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uncle_bytes: Bytes,
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}
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impl<'x, 'y> OpenBlock<'x, 'y> {
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/// Create a new OpenBlock ready for transaction pushing.
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pub fn new<'a, 'b>(engine: &'a Engine, db: JournalDB, parent: &Header, last_hashes: &'b LastHashes, author: Address, extra_data: Bytes) -> OpenBlock<'a, 'b> {
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let mut r = OpenBlock {
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block: Block::new(State::from_existing(db, parent.state_root().clone(), engine.account_start_nonce())),
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engine: engine,
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last_hashes: last_hashes,
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};
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r.block.header.set_number(parent.number() + 1);
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r.block.header.set_author(author);
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r.block.header.set_extra_data(extra_data);
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r.block.header.set_timestamp_now();
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engine.populate_from_parent(&mut r.block.header, parent);
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engine.on_new_block(&mut r.block);
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r
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}
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/// Alter the author for the block.
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pub fn set_author(&mut self, author: Address) { self.block.header.set_author(author); }
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/// Alter the timestamp of the block.
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pub fn set_timestamp(&mut self, timestamp: u64) { self.block.header.set_timestamp(timestamp); }
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/// Alter the difficulty for the block.
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pub fn set_difficulty(&mut self, a: U256) { self.block.header.set_difficulty(a); }
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/// Alter the gas limit for the block.
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pub fn set_gas_limit(&mut self, a: U256) { self.block.header.set_gas_limit(a); }
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/// Alter the gas limit for the block.
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pub fn set_gas_used(&mut self, a: U256) { self.block.header.set_gas_used(a); }
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/// Alter the extra_data for the block.
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pub fn set_extra_data(&mut self, extra_data: Bytes) -> Result<(), BlockError> {
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if extra_data.len() > self.engine.maximum_extra_data_size() {
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Err(BlockError::ExtraDataOutOfBounds(OutOfBounds{min: None, max: Some(self.engine.maximum_extra_data_size()), found: extra_data.len()}))
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} else {
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self.block.header.set_extra_data(extra_data);
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Ok(())
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}
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}
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/// Add an uncle to the block, if possible.
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///
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/// NOTE Will check chain constraints and the uncle number but will NOT check
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/// that the header itself is actually valid.
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pub fn push_uncle(&mut self, valid_uncle_header: Header) -> Result<(), BlockError> {
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if self.block.uncles.len() >= self.engine.maximum_uncle_count() {
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return Err(BlockError::TooManyUncles(OutOfBounds{min: None, max: Some(self.engine.maximum_uncle_count()), found: self.block.uncles.len()}));
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}
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// TODO: check number
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// TODO: check not a direct ancestor (use last_hashes for that)
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self.block.uncles.push(valid_uncle_header);
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Ok(())
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}
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/// Get the environment info concerning this block.
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pub fn env_info(&self) -> EnvInfo {
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// TODO: memoise.
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EnvInfo {
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number: self.block.header.number,
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author: self.block.header.author.clone(),
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timestamp: self.block.header.timestamp,
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difficulty: self.block.header.difficulty.clone(),
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last_hashes: self.last_hashes.clone(), // TODO: should be a reference.
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gas_used: self.block.archive.last().map_or(U256::zero(), |t| t.receipt.gas_used),
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gas_limit: self.block.header.gas_limit.clone(),
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}
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}
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/// Push a transaction into the block.
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///
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/// If valid, it will be executed, and archived together with the receipt.
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pub fn push_transaction(&mut self, t: Transaction, h: Option<H256>) -> Result<&Receipt, Error> {
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let env_info = self.env_info();
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// info!("env_info says gas_used={}", env_info.gas_used);
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match self.block.state.apply(&env_info, self.engine, &t) {
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Ok(receipt) => {
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flushln!("Transaction executed {:?}", receipt);
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self.block.archive_set.insert(h.unwrap_or_else(||t.hash()));
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self.block.archive.push(Entry { transaction: t, receipt: receipt });
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Ok(&self.block.archive.last().unwrap().receipt)
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}
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Err(x) => Err(From::from(x))
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}
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}
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/// Turn this into a `ClosedBlock`. A BlockChain must be provided in order to figure out the uncles.
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pub fn close(self) -> ClosedBlock<'x, 'y> {
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let mut s = self;
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s.engine.on_close_block(&mut s.block);
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s.block.header.transactions_root = ordered_trie_root(s.block.archive.iter().map(|ref e| e.transaction.rlp_bytes()).collect());
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let uncle_bytes = s.block.uncles.iter().fold(RlpStream::new_list(s.block.uncles.len()), |mut s, u| {s.append(&u.rlp(Seal::With)); s} ).out();
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s.block.header.uncles_hash = uncle_bytes.sha3();
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s.block.header.state_root = s.block.state.root().clone();
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s.block.header.receipts_root = ordered_trie_root(s.block.archive.iter().map(|ref e| e.receipt.rlp_bytes()).collect());
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s.block.header.log_bloom = s.block.archive.iter().fold(LogBloom::zero(), |mut b, e| {b |= &e.receipt.log_bloom; b});
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s.block.header.gas_used = s.block.archive.last().map_or(U256::zero(), |t| t.receipt.gas_used);
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s.block.header.note_dirty();
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ClosedBlock::new(s, uncle_bytes)
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}
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}
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impl<'x, 'y> IsBlock for OpenBlock<'x, 'y> {
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fn block(&self) -> &Block { &self.block }
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}
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impl<'x, 'y> IsBlock for ClosedBlock<'x, 'y> {
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fn block(&self) -> &Block { &self.open_block.block }
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}
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impl<'x, 'y> ClosedBlock<'x, 'y> {
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fn new<'a, 'b>(open_block: OpenBlock<'a, 'b>, uncle_bytes: Bytes) -> ClosedBlock<'a, 'b> {
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ClosedBlock {
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open_block: open_block,
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uncle_bytes: uncle_bytes,
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}
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}
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/// Get the hash of the header without seal arguments.
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pub fn hash(&self) -> H256 { self.header().rlp_sha3(Seal::Without) }
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/// Provide a valid seal in order to turn this into a `SealedBlock`.
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///
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/// NOTE: This does not check the validity of `seal` with the engine.
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pub fn seal(self, seal: Vec<Bytes>) -> Result<SealedBlock, BlockError> {
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let mut s = self;
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if seal.len() != s.open_block.engine.seal_fields() {
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return Err(BlockError::InvalidSealArity(Mismatch{expected: s.open_block.engine.seal_fields(), found: seal.len()}));
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}
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s.open_block.block.header.set_seal(seal);
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Ok(SealedBlock { block: s.open_block.block, uncle_bytes: s.uncle_bytes })
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}
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/// Turn this back into an `OpenBlock`.
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pub fn reopen(self) -> OpenBlock<'x, 'y> { self.open_block }
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/// Drop this object and return the underlieing database.
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pub fn drain(self) -> JournalDB { self.open_block.block.state.drop().1 }
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}
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impl SealedBlock {
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/// Get the RLP-encoding of the block.
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pub fn rlp_bytes(&self) -> Bytes {
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let mut block_rlp = RlpStream::new_list(3);
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self.block.header.stream_rlp(&mut block_rlp, Seal::With);
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block_rlp.append_list(self.block.archive.len());
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for e in &self.block.archive { e.transaction.rlp_append(&mut block_rlp); }
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block_rlp.append_raw(&self.uncle_bytes, 1);
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block_rlp.out()
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}
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/// Drop this object and return the underlieing database.
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pub fn drain(self) -> JournalDB { self.block.state.drop().1 }
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}
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impl IsBlock for SealedBlock {
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fn block(&self) -> &Block { &self.block }
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}
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/// Enact the block given by block header, transactions and uncles
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pub fn enact<'x, 'y>(header: &Header, transactions: &[Transaction], uncles: &[Header], engine: &'x Engine, db: JournalDB, parent: &Header, last_hashes: &'y LastHashes) -> Result<ClosedBlock<'x, 'y>, Error> {
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{
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let s = State::from_existing(db.clone(), parent.state_root().clone(), engine.account_start_nonce());
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trace!("enact(): root={}, author={}, author_balance={}\n", s.root(), header.author(), s.balance(&header.author()));
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}
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let mut b = OpenBlock::new(engine, db, parent, last_hashes, header.author().clone(), header.extra_data().clone());
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b.set_difficulty(*header.difficulty());
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b.set_gas_limit(*header.gas_limit());
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b.set_timestamp(header.timestamp());
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for t in transactions { try!(b.push_transaction(t.clone(), None)); }
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for u in uncles { try!(b.push_uncle(u.clone())); }
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Ok(b.close())
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}
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/// Enact the block given by `block_bytes` using `engine` on the database `db` with given `parent` block header
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pub fn enact_bytes<'x, 'y>(block_bytes: &[u8], engine: &'x Engine, db: JournalDB, parent: &Header, last_hashes: &'y LastHashes) -> Result<ClosedBlock<'x, 'y>, Error> {
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let block = BlockView::new(block_bytes);
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let header = block.header();
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enact(&header, &block.transactions(), &block.uncles(), engine, db, parent, last_hashes)
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}
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/// Enact the block given by `block_bytes` using `engine` on the database `db` with given `parent` block header
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pub fn enact_verified<'x, 'y>(block: &PreVerifiedBlock, engine: &'x Engine, db: JournalDB, parent: &Header, last_hashes: &'y LastHashes) -> Result<ClosedBlock<'x, 'y>, Error> {
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let view = BlockView::new(&block.bytes);
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enact(&block.header, &block.transactions, &view.uncles(), engine, db, parent, last_hashes)
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}
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/// Enact the block given by `block_bytes` using `engine` on the database `db` with given `parent` block header. Seal the block aferwards
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pub fn enact_and_seal(block_bytes: &[u8], engine: &Engine, db: JournalDB, parent: &Header, last_hashes: &LastHashes) -> Result<SealedBlock, Error> {
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let header = BlockView::new(block_bytes).header_view();
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Ok(try!(try!(enact_bytes(block_bytes, engine, db, parent, last_hashes)).seal(header.seal())))
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}
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#[test]
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fn open_block() {
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use spec::*;
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let engine = Spec::new_test().to_engine().unwrap();
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let genesis_header = engine.spec().genesis_header();
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let mut db = JournalDB::new_temp();
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engine.spec().ensure_db_good(&mut db);
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let last_hashes = vec![genesis_header.hash()];
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let b = OpenBlock::new(engine.deref(), db, &genesis_header, &last_hashes, Address::zero(), vec![]);
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let b = b.close();
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let _ = b.seal(vec![]);
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}
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#[test]
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fn enact_block() {
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use spec::*;
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let engine = Spec::new_test().to_engine().unwrap();
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let genesis_header = engine.spec().genesis_header();
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let mut db = JournalDB::new_temp();
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engine.spec().ensure_db_good(&mut db);
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let b = OpenBlock::new(engine.deref(), db, &genesis_header, &vec![genesis_header.hash()], Address::zero(), vec![]).close().seal(vec![]).unwrap();
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let orig_bytes = b.rlp_bytes();
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let orig_db = b.drain();
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let mut db = JournalDB::new_temp();
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engine.spec().ensure_db_good(&mut db);
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let e = enact_and_seal(&orig_bytes, engine.deref(), db, &genesis_header, &vec![genesis_header.hash()]).unwrap();
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assert_eq!(e.rlp_bytes(), orig_bytes);
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let db = e.drain();
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assert_eq!(orig_db.keys(), db.keys());
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assert!(orig_db.keys().iter().filter(|k| orig_db.get(k.0) != db.get(k.0)).next() == None);
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}
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