openethereum/ethcore/src/externalities.rs

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// 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/>.
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//! Transaction Execution environment.
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use std::cmp;
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use std::sync::Arc;
use ethereum_types::{H256, U256, Address};
use bytes::{Bytes, BytesRef};
use state::{Backend as StateBackend, State, Substate, CleanupMode};
use machine::EthereumMachine as Machine;
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use executive::*;
use vm::{
self, ActionParams, ActionValue, EnvInfo, CallType, Schedule,
Ext, ContractCreateResult, MessageCallResult, CreateContractAddress,
ReturnData
};
use evm::FinalizationResult;
use transaction::UNSIGNED_SENDER;
use trace::{Tracer, VMTracer};
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/// Policy for handling output data on `RETURN` opcode.
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pub enum OutputPolicy<'a, 'b> {
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/// Return reference to fixed sized output.
/// Used for message calls.
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Return(BytesRef<'a>, Option<&'b mut Bytes>),
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/// Init new contract as soon as `RETURN` is called.
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InitContract(Option<&'b mut Bytes>),
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}
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/// Transaction properties that externalities need to know about.
pub struct OriginInfo {
address: Address,
origin: Address,
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gas_price: U256,
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value: U256,
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}
impl OriginInfo {
/// Populates origin info from action params.
pub fn from(params: &ActionParams) -> Self {
OriginInfo {
address: params.address.clone(),
origin: params.origin.clone(),
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gas_price: params.gas_price,
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value: match params.value {
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ActionValue::Transfer(val) | ActionValue::Apparent(val) => val
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},
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}
}
}
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/// Implementation of evm Externalities.
pub struct Externalities<'a, T: 'a, V: 'a, B: 'a>
where T: Tracer, V: VMTracer, B: StateBackend
{
state: &'a mut State<B>,
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env_info: &'a EnvInfo,
machine: &'a Machine,
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depth: usize,
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origin_info: OriginInfo,
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substate: &'a mut Substate,
schedule: Schedule,
output: OutputPolicy<'a, 'a>,
tracer: &'a mut T,
vm_tracer: &'a mut V,
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static_flag: bool,
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}
impl<'a, T: 'a, V: 'a, B: 'a> Externalities<'a, T, V, B>
where T: Tracer, V: VMTracer, B: StateBackend
{
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/// Basic `Externalities` constructor.
pub fn new(state: &'a mut State<B>,
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env_info: &'a EnvInfo,
machine: &'a Machine,
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depth: usize,
origin_info: OriginInfo,
substate: &'a mut Substate,
output: OutputPolicy<'a, 'a>,
tracer: &'a mut T,
vm_tracer: &'a mut V,
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static_flag: bool,
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) -> Self {
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Externalities {
state: state,
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env_info: env_info,
machine: machine,
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depth: depth,
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origin_info: origin_info,
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substate: substate,
schedule: machine.schedule(env_info.number),
output: output,
tracer: tracer,
vm_tracer: vm_tracer,
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static_flag: static_flag,
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}
}
}
impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
where T: Tracer, V: VMTracer, B: StateBackend
{
fn storage_at(&self, key: &H256) -> vm::Result<H256> {
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self.state.storage_at(&self.origin_info.address, key).map_err(Into::into)
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}
fn set_storage(&mut self, key: H256, value: H256) -> vm::Result<()> {
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if self.static_flag {
Err(vm::Error::MutableCallInStaticContext)
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} else {
self.state.set_storage(&self.origin_info.address, key, value).map_err(Into::into)
}
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}
fn is_static(&self) -> bool {
return self.static_flag
}
fn exists(&self, address: &Address) -> vm::Result<bool> {
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self.state.exists(address).map_err(Into::into)
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}
fn exists_and_not_null(&self, address: &Address) -> vm::Result<bool> {
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self.state.exists_and_not_null(address).map_err(Into::into)
}
fn origin_balance(&self) -> vm::Result<U256> {
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self.balance(&self.origin_info.address).map_err(Into::into)
}
fn balance(&self, address: &Address) -> vm::Result<U256> {
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self.state.balance(address).map_err(Into::into)
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}
fn blockhash(&mut self, number: &U256) -> H256 {
if self.env_info.number + 256 >= self.machine.params().eip210_transition {
let blockhash_contract_address = self.machine.params().eip210_contract_address;
let code_res = self.state.code(&blockhash_contract_address)
.and_then(|code| self.state.code_hash(&blockhash_contract_address).map(|hash| (code, hash)));
let (code, code_hash) = match code_res {
Ok((code, hash)) => (code, hash),
Err(_) => return H256::zero(),
};
let params = ActionParams {
sender: self.origin_info.address.clone(),
address: blockhash_contract_address.clone(),
value: ActionValue::Apparent(self.origin_info.value),
code_address: blockhash_contract_address.clone(),
origin: self.origin_info.origin.clone(),
gas: self.machine.params().eip210_contract_gas,
gas_price: 0.into(),
code: code,
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code_hash: Some(code_hash),
data: Some(H256::from(number).to_vec()),
call_type: CallType::Call,
params_type: vm::ParamsType::Separate,
};
let mut output = H256::new();
let mut ex = Executive::new(self.state, self.env_info, self.machine);
let r = ex.call(params, self.substate, BytesRef::Fixed(&mut output), self.tracer, self.vm_tracer);
trace!("ext: blockhash contract({}) -> {:?}({}) self.env_info.number={}\n", number, r, output, self.env_info.number);
output
} else {
// TODO: comment out what this function expects from env_info, since it will produce panics if the latter is inconsistent
match *number < U256::from(self.env_info.number) && number.low_u64() >= cmp::max(256, self.env_info.number) - 256 {
true => {
let index = self.env_info.number - number.low_u64() - 1;
assert!(index < self.env_info.last_hashes.len() as u64, format!("Inconsistent env_info, should contain at least {:?} last hashes", index+1));
let r = self.env_info.last_hashes[index as usize].clone();
trace!("ext: blockhash({}) -> {} self.env_info.number={}\n", number, r, self.env_info.number);
r
},
false => {
trace!("ext: blockhash({}) -> null self.env_info.number={}\n", number, self.env_info.number);
H256::zero()
},
}
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}
}
fn create(&mut self, gas: &U256, value: &U256, code: &[u8], address_scheme: CreateContractAddress) -> ContractCreateResult {
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// create new contract address
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let (address, code_hash) = match self.state.nonce(&self.origin_info.address) {
Ok(nonce) => contract_address(address_scheme, &self.origin_info.address, &nonce, &code),
Err(e) => {
debug!(target: "ext", "Database corruption encountered: {:?}", e);
return ContractCreateResult::Failed
}
};
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// prepare the params
let params = ActionParams {
code_address: address.clone(),
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address: address.clone(),
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sender: self.origin_info.address.clone(),
origin: self.origin_info.origin.clone(),
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gas: *gas,
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gas_price: self.origin_info.gas_price,
value: ActionValue::Transfer(*value),
code: Some(Arc::new(code.to_vec())),
code_hash: code_hash,
data: None,
call_type: CallType::None,
params_type: vm::ParamsType::Embedded,
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};
if !self.static_flag {
if !self.schedule.eip86 || params.sender != UNSIGNED_SENDER {
if let Err(e) = self.state.inc_nonce(&self.origin_info.address) {
debug!(target: "ext", "Database corruption encountered: {:?}", e);
return ContractCreateResult::Failed
}
}
}
let mut ex = Executive::from_parent(self.state, self.env_info, self.machine, self.depth, self.static_flag);
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// TODO: handle internal error separately
match ex.create(params, self.substate, &mut None, self.tracer, self.vm_tracer) {
Ok(FinalizationResult{ gas_left, apply_state: true, .. }) => {
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self.substate.contracts_created.push(address.clone());
ContractCreateResult::Created(address, gas_left)
},
Ok(FinalizationResult{ gas_left, apply_state: false, return_data }) => {
ContractCreateResult::Reverted(gas_left, return_data)
},
_ => ContractCreateResult::Failed,
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}
}
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fn call(&mut self,
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gas: &U256,
sender_address: &Address,
receive_address: &Address,
value: Option<U256>,
data: &[u8],
code_address: &Address,
output: &mut [u8],
call_type: CallType
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) -> MessageCallResult {
trace!(target: "externalities", "call");
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let code_res = self.state.code(code_address)
.and_then(|code| self.state.code_hash(code_address).map(|hash| (code, hash)));
let (code, code_hash) = match code_res {
Ok((code, hash)) => (code, hash),
Err(_) => return MessageCallResult::Failed,
};
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let mut params = ActionParams {
sender: sender_address.clone(),
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address: receive_address.clone(),
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value: ActionValue::Apparent(self.origin_info.value),
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code_address: code_address.clone(),
origin: self.origin_info.origin.clone(),
gas: *gas,
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gas_price: self.origin_info.gas_price,
code: code,
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code_hash: Some(code_hash),
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data: Some(data.to_vec()),
call_type: call_type,
params_type: vm::ParamsType::Separate,
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};
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if let Some(value) = value {
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params.value = ActionValue::Transfer(value);
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}
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let mut ex = Executive::from_parent(self.state, self.env_info, self.machine, self.depth, self.static_flag);
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match ex.call(params, self.substate, BytesRef::Fixed(output), self.tracer, self.vm_tracer) {
Ok(FinalizationResult{ gas_left, return_data, apply_state: true }) => MessageCallResult::Success(gas_left, return_data),
Ok(FinalizationResult{ gas_left, return_data, apply_state: false }) => MessageCallResult::Reverted(gas_left, return_data),
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_ => MessageCallResult::Failed
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}
}
fn extcode(&self, address: &Address) -> vm::Result<Arc<Bytes>> {
Ok(self.state.code(address)?.unwrap_or_else(|| Arc::new(vec![])))
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}
fn extcodesize(&self, address: &Address) -> vm::Result<usize> {
Ok(self.state.code_size(address)?.unwrap_or(0))
}
fn ret(mut self, gas: &U256, data: &ReturnData, apply_state: bool) -> vm::Result<U256>
where Self: Sized {
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let handle_copy = |to: &mut Option<&mut Bytes>| {
to.as_mut().map(|b| **b = data.to_vec());
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};
match self.output {
OutputPolicy::Return(BytesRef::Fixed(ref mut slice), ref mut copy) => {
handle_copy(copy);
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let len = cmp::min(slice.len(), data.len());
(&mut slice[..len]).copy_from_slice(&data[..len]);
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Ok(*gas)
},
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OutputPolicy::Return(BytesRef::Flexible(ref mut vec), ref mut copy) => {
handle_copy(copy);
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vec.clear();
vec.extend_from_slice(&*data);
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Ok(*gas)
},
OutputPolicy::InitContract(ref mut copy) if apply_state => {
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let return_cost = U256::from(data.len()) * U256::from(self.schedule.create_data_gas);
if return_cost > *gas || data.len() > self.schedule.create_data_limit {
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return match self.schedule.exceptional_failed_code_deposit {
true => Err(vm::Error::OutOfGas),
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false => Ok(*gas)
}
}
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handle_copy(copy);
self.state.init_code(&self.origin_info.address, data.to_vec())?;
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Ok(*gas - return_cost)
},
OutputPolicy::InitContract(_) => {
Ok(*gas)
},
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}
}
fn log(&mut self, topics: Vec<H256>, data: &[u8]) -> vm::Result<()> {
use log_entry::LogEntry;
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if self.static_flag {
return Err(vm::Error::MutableCallInStaticContext);
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}
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let address = self.origin_info.address.clone();
self.substate.logs.push(LogEntry {
address: address,
topics: topics,
data: data.to_vec()
});
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Ok(())
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}
fn suicide(&mut self, refund_address: &Address) -> vm::Result<()> {
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if self.static_flag {
return Err(vm::Error::MutableCallInStaticContext);
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}
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let address = self.origin_info.address.clone();
let balance = self.balance(&address)?;
if &address == refund_address {
// TODO [todr] To be consistent with CPP client we set balance to 0 in that case.
self.state.sub_balance(&address, &balance, &mut CleanupMode::NoEmpty)?;
} else {
trace!(target: "ext", "Suiciding {} -> {} (xfer: {})", address, refund_address, balance);
self.state.transfer_balance(
&address,
refund_address,
&balance,
self.substate.to_cleanup_mode(&self.schedule)
)?;
}
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self.tracer.trace_suicide(address, balance, refund_address.clone());
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self.substate.suicides.insert(address);
Ok(())
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}
fn schedule(&self) -> &Schedule {
&self.schedule
}
fn env_info(&self) -> &EnvInfo {
self.env_info
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}
fn depth(&self) -> usize {
self.depth
}
fn inc_sstore_clears(&mut self) {
self.substate.sstore_clears_count = self.substate.sstore_clears_count + U256::one();
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}
fn trace_next_instruction(&mut self, pc: usize, instruction: u8, current_gas: U256) -> bool {
self.vm_tracer.trace_next_instruction(pc, instruction, current_gas)
}
fn trace_prepare_execute(&mut self, pc: usize, instruction: u8, gas_cost: U256) {
self.vm_tracer.trace_prepare_execute(pc, instruction, gas_cost)
}
fn trace_executed(&mut self, gas_used: U256, stack_push: &[U256], mem_diff: Option<(usize, &[u8])>, store_diff: Option<(U256, U256)>) {
self.vm_tracer.trace_executed(gas_used, stack_push, mem_diff, store_diff)
}
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}
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#[cfg(test)]
mod tests {
use ethereum_types::{U256, Address};
use evm::{EnvInfo, Ext, CallType};
use state::{State, Substate};
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use tests::helpers::*;
use super::*;
use trace::{NoopTracer, NoopVMTracer};
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fn get_test_origin() -> OriginInfo {
OriginInfo {
address: Address::zero(),
origin: Address::zero(),
gas_price: U256::zero(),
value: U256::zero()
}
}
fn get_test_env_info() -> EnvInfo {
EnvInfo {
number: 100,
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author: 0.into(),
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timestamp: 0,
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difficulty: 0.into(),
last_hashes: Arc::new(vec![]),
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gas_used: 0.into(),
gas_limit: 0.into(),
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}
}
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struct TestSetup {
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state: State<::state_db::StateDB>,
machine: ::machine::EthereumMachine,
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sub_state: Substate,
env_info: EnvInfo
}
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impl Default for TestSetup {
fn default() -> Self {
TestSetup::new()
}
}
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impl TestSetup {
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fn new() -> Self {
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TestSetup {
state: get_temp_state(),
machine: ::spec::Spec::new_test_machine(),
sub_state: Substate::new(),
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env_info: get_test_env_info()
}
}
}
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#[test]
fn can_be_created() {
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let mut setup = TestSetup::new();
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let state = &mut setup.state;
let mut tracer = NoopTracer;
let mut vm_tracer = NoopVMTracer;
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let ext = Externalities::new(state, &setup.env_info, &setup.machine, 0, get_test_origin(), &mut setup.sub_state, OutputPolicy::InitContract(None), &mut tracer, &mut vm_tracer, false);
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assert_eq!(ext.env_info().number, 100);
}
#[test]
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fn can_return_block_hash_no_env() {
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let mut setup = TestSetup::new();
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let state = &mut setup.state;
let mut tracer = NoopTracer;
let mut vm_tracer = NoopVMTracer;
let mut ext = Externalities::new(state, &setup.env_info, &setup.machine, 0, get_test_origin(), &mut setup.sub_state, OutputPolicy::InitContract(None), &mut tracer, &mut vm_tracer, false);
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let hash = ext.blockhash(&"0000000000000000000000000000000000000000000000000000000000120000".parse::<U256>().unwrap());
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assert_eq!(hash, H256::zero());
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}
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#[test]
fn can_return_block_hash() {
let test_hash = H256::from("afafafafafafafafafafafbcbcbcbcbcbcbcbcbcbeeeeeeeeeeeeedddddddddd");
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let test_env_number = 0x120001;
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let mut setup = TestSetup::new();
{
let env_info = &mut setup.env_info;
env_info.number = test_env_number;
let mut last_hashes = (*env_info.last_hashes).clone();
last_hashes.push(test_hash.clone());
env_info.last_hashes = Arc::new(last_hashes);
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}
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let state = &mut setup.state;
let mut tracer = NoopTracer;
let mut vm_tracer = NoopVMTracer;
let mut ext = Externalities::new(state, &setup.env_info, &setup.machine, 0, get_test_origin(), &mut setup.sub_state, OutputPolicy::InitContract(None), &mut tracer, &mut vm_tracer, false);
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let hash = ext.blockhash(&"0000000000000000000000000000000000000000000000000000000000120000".parse::<U256>().unwrap());
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assert_eq!(test_hash, hash);
}
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#[test]
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#[should_panic]
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fn can_call_fail_empty() {
let mut setup = TestSetup::new();
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let state = &mut setup.state;
let mut tracer = NoopTracer;
let mut vm_tracer = NoopVMTracer;
let mut ext = Externalities::new(state, &setup.env_info, &setup.machine, 0, get_test_origin(), &mut setup.sub_state, OutputPolicy::InitContract(None), &mut tracer, &mut vm_tracer, false);
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let mut output = vec![];
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// this should panic because we have no balance on any account
ext.call(
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&"0000000000000000000000000000000000000000000000000000000000120000".parse::<U256>().unwrap(),
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&Address::new(),
&Address::new(),
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Some("0000000000000000000000000000000000000000000000000000000000150000".parse::<U256>().unwrap()),
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&[],
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&Address::new(),
&mut output,
CallType::Call
);
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}
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#[test]
fn can_log() {
let log_data = vec![120u8, 110u8];
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let log_topics = vec![H256::from("af0fa234a6af46afa23faf23bcbc1c1cb4bcb7bcbe7e7e7ee3ee2edddddddddd")];
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let mut setup = TestSetup::new();
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let state = &mut setup.state;
let mut tracer = NoopTracer;
let mut vm_tracer = NoopVMTracer;
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{
let mut ext = Externalities::new(state, &setup.env_info, &setup.machine, 0, get_test_origin(), &mut setup.sub_state, OutputPolicy::InitContract(None), &mut tracer, &mut vm_tracer, false);
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ext.log(log_topics, &log_data).unwrap();
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}
assert_eq!(setup.sub_state.logs.len(), 1);
}
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#[test]
fn can_suicide() {
let refund_account = &Address::new();
let mut setup = TestSetup::new();
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let state = &mut setup.state;
let mut tracer = NoopTracer;
let mut vm_tracer = NoopVMTracer;
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{
let mut ext = Externalities::new(state, &setup.env_info, &setup.machine, 0, get_test_origin(), &mut setup.sub_state, OutputPolicy::InitContract(None), &mut tracer, &mut vm_tracer, false);
ext.suicide(refund_account).unwrap();
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}
assert_eq!(setup.sub_state.suicides.len(), 1);
}
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}