openethereum/ethcore/src/basic_authority.rs

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// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! A blockchain engine that supports a basic, non-BFT proof-of-authority.
use common::*;
use account_provider::AccountProvider;
use block::*;
use spec::{CommonParams, Spec};
use engine::*;
use evm::Schedule;
use ethjson;
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/// `BasicAuthority` params.
#[derive(Debug, PartialEq)]
pub struct BasicAuthorityParams {
/// Gas limit divisor.
pub gas_limit_bound_divisor: U256,
/// Block duration.
pub duration_limit: u64,
/// Valid signatories.
pub authorities: HashSet<Address>,
}
impl From<ethjson::spec::BasicAuthorityParams> for BasicAuthorityParams {
fn from(p: ethjson::spec::BasicAuthorityParams) -> Self {
BasicAuthorityParams {
gas_limit_bound_divisor: p.gas_limit_bound_divisor.into(),
duration_limit: p.duration_limit.into(),
authorities: p.authorities.into_iter().map(Into::into).collect::<HashSet<_>>(),
}
}
}
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/// Engine using `BasicAuthority` proof-of-work consensus algorithm, suitable for Ethereum
/// mainnet chains in the Olympic, Frontier and Homestead eras.
pub struct BasicAuthority {
params: CommonParams,
our_params: BasicAuthorityParams,
builtins: BTreeMap<Address, Builtin>,
}
impl BasicAuthority {
/// Create a new instance of BasicAuthority engine
pub fn new(params: CommonParams, our_params: BasicAuthorityParams, builtins: BTreeMap<Address, Builtin>) -> Self {
BasicAuthority {
params: params,
our_params: our_params,
builtins: builtins,
}
}
}
impl Engine for BasicAuthority {
fn name(&self) -> &str { "BasicAuthority" }
fn version(&self) -> SemanticVersion { SemanticVersion::new(1, 0, 0) }
// One field - the signature
fn seal_fields(&self) -> usize { 1 }
fn params(&self) -> &CommonParams { &self.params }
fn builtins(&self) -> &BTreeMap<Address, Builtin> { &self.builtins }
/// Additional engine-specific information for the user/developer concerning `header`.
fn extra_info(&self, _header: &Header) -> HashMap<String, String> { hash_map!["signature".to_owned() => "TODO".to_owned()] }
fn schedule(&self, _env_info: &EnvInfo) -> Schedule {
Schedule::new_homestead()
}
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fn populate_from_parent(&self, header: &mut Header, parent: &Header, gas_floor_target: U256, _gas_ceil_target: U256) {
header.difficulty = parent.difficulty;
header.gas_limit = {
let gas_limit = parent.gas_limit;
let bound_divisor = self.our_params.gas_limit_bound_divisor;
if gas_limit < gas_floor_target {
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min(gas_floor_target, gas_limit + gas_limit / bound_divisor - 1.into())
} else {
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max(gas_floor_target, gas_limit - gas_limit / bound_divisor + 1.into())
}
};
header.note_dirty();
// info!("ethash: populate_from_parent #{}: difficulty={} and gas_limit={}", header.number, header.difficulty, header.gas_limit);
}
/// Apply the block reward on finalisation of the block.
/// This assumes that all uncles are valid uncles (i.e. of at least one generation before the current).
fn on_close_block(&self, _block: &mut ExecutedBlock) {}
/// Attempt to seal the block internally.
///
/// This operation is synchronous and may (quite reasonably) not be available, in which `false` will
/// be returned.
fn generate_seal(&self, block: &ExecutedBlock, accounts: Option<&AccountProvider>) -> Option<Vec<Bytes>> {
if let Some(ap) = accounts {
let header = block.header();
let message = header.bare_hash();
// account should be pernamently unlocked, otherwise sealing will fail
if let Ok(signature) = ap.sign(*block.header().author(), message) {
return Some(vec![encode(&signature).to_vec()]);
} else {
trace!(target: "basicauthority", "generate_seal: FAIL: accounts secret key unavailable");
}
} else {
trace!(target: "basicauthority", "generate_seal: FAIL: accounts not provided");
}
None
}
fn verify_block_basic(&self, header: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
// check the seal fields.
// TODO: pull this out into common code.
if header.seal.len() != self.seal_fields() {
return Err(From::from(BlockError::InvalidSealArity(
Mismatch { expected: self.seal_fields(), found: header.seal.len() }
)));
}
Ok(())
}
fn verify_block_unordered(&self, header: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
// check the signature is legit.
let sig = try!(UntrustedRlp::new(&header.seal[0]).as_val::<H520>());
let signer = Address::from(try!(ec::recover(&sig, &header.bare_hash())).sha3());
if !self.our_params.authorities.contains(&signer) {
return try!(Err(BlockError::InvalidSeal));
}
Ok(())
}
fn verify_block_family(&self, header: &Header, parent: &Header, _block: Option<&[u8]>) -> result::Result<(), Error> {
// we should not calculate difficulty for genesis blocks
if header.number() == 0 {
return Err(From::from(BlockError::RidiculousNumber(OutOfBounds { min: Some(1), max: None, found: header.number() })));
}
// Check difficulty is correct given the two timestamps.
if header.difficulty() != parent.difficulty() {
return Err(From::from(BlockError::InvalidDifficulty(Mismatch { expected: *parent.difficulty(), found: *header.difficulty() })))
}
let gas_limit_divisor = self.our_params.gas_limit_bound_divisor;
let min_gas = parent.gas_limit - parent.gas_limit / gas_limit_divisor;
let max_gas = parent.gas_limit + parent.gas_limit / gas_limit_divisor;
if header.gas_limit <= min_gas || header.gas_limit >= max_gas {
return Err(From::from(BlockError::InvalidGasLimit(OutOfBounds { min: Some(min_gas), max: Some(max_gas), found: header.gas_limit })));
}
Ok(())
}
fn verify_transaction_basic(&self, t: &SignedTransaction, _header: &Header) -> result::Result<(), Error> {
try!(t.check_low_s());
Ok(())
}
fn verify_transaction(&self, t: &SignedTransaction, _header: &Header) -> Result<(), Error> {
t.sender().map(|_|()) // Perform EC recovery and cache sender
}
}
impl Header {
/// Get the none field of the header.
pub fn signature(&self) -> H520 {
decode(&self.seal()[0])
}
}
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/// Create a new test chain spec with `BasicAuthority` consensus engine.
pub fn new_test_authority() -> Spec { Spec::load(include_bytes!("../res/test_authority.json")) }
#[cfg(test)]
mod tests {
use super::*;
use common::*;
use block::*;
use tests::helpers::*;
use account_provider::AccountProvider;
#[test]
fn has_valid_metadata() {
let engine = new_test_authority().engine;
assert!(!engine.name().is_empty());
assert!(engine.version().major >= 1);
}
#[test]
fn can_return_schedule() {
let engine = new_test_authority().engine;
let schedule = engine.schedule(&EnvInfo {
number: 10000000,
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author: 0.into(),
timestamp: 0,
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difficulty: 0.into(),
last_hashes: vec![],
dao_rescue_block_gas_limit: None,
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gas_used: 0.into(),
gas_limit: 0.into(),
});
assert!(schedule.stack_limit > 0);
}
#[test]
fn can_do_seal_verification_fail() {
let engine = new_test_authority().engine;
let header: Header = Header::default();
let verify_result = engine.verify_block_basic(&header, None);
match verify_result {
Err(Error::Block(BlockError::InvalidSealArity(_))) => {},
Err(_) => { panic!("should be block seal-arity mismatch error (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_do_signature_verification_fail() {
let engine = new_test_authority().engine;
let mut header: Header = Header::default();
header.set_seal(vec![rlp::encode(&Signature::zero()).to_vec()]);
let verify_result = engine.verify_block_unordered(&header, None);
match verify_result {
Err(Error::Util(UtilError::Crypto(CryptoError::InvalidSignature))) => {},
Err(_) => { panic!("should be block difficulty error (got {:?})", verify_result); },
_ => { panic!("Should be error, got Ok"); },
}
}
#[test]
fn can_generate_seal() {
let tap = AccountProvider::transient_provider();
let addr = tap.insert_account("".sha3(), "").unwrap();
tap.unlock_account_permanently(addr, "".into()).unwrap();
let spec = new_test_authority();
let engine = &spec.engine;
let genesis_header = spec.genesis_header();
let mut db_result = get_temp_journal_db();
let mut db = db_result.take();
spec.ensure_db_good(db.as_hashdb_mut());
let last_hashes = vec![genesis_header.hash()];
let vm_factory = Default::default();
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let b = OpenBlock::new(engine.deref(), &vm_factory, false, db, &genesis_header, last_hashes, None, addr, (3141562.into(), 31415620.into()), vec![]).unwrap();
let b = b.close_and_lock();
let seal = engine.generate_seal(b.block(), Some(&tap)).unwrap();
assert!(b.try_seal(engine.deref(), seal).is_ok());
}
}