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Version and notification for private contract wrapper added (#9761) 

* Version and notification for private contract wrapper added

* Error handling improved

* Style for comments in file fixed

* TODO issue added into comments
This commit is contained in:
Anton Gavrilov 2018-12-03 20:44:36 +01:00 committed by André Silva
parent 60691d03e0
commit 4ded4181a6
3 changed files with 267 additions and 66 deletions
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2
ethcore/private-tx/res/private.evm
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File diff suppressed because one or more lines are too long

172
ethcore/private-tx/res/private.json
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@ -1 +1,171 @@
[{"constant": false,"inputs": [{"name": "newState","type": "bytes"},{"name": "v","type": "uint8[]"},{"name": "r","type": "bytes32[]"},{"name": "s","type": "bytes32[]"}],"name": "setState","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"},{"constant": true,"inputs": [],"name": "code","outputs": [{"name": "","type": "bytes"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": true,"inputs": [{"name": "","type": "uint256"}],"name": "validators","outputs": [{"name": "","type": "address"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": true,"inputs": [],"name": "nonce","outputs": [{"name": "","type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": true,"inputs": [],"name": "getValidators","outputs": [{"name": "","type": "address[]"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": true,"inputs": [],"name": "state","outputs": [{"name": "","type": "bytes"}],"payable": false,"stateMutability": "view","type": "function"},{"inputs": [{"name": "initialValidators","type": "address[]"},{"name": "initialCode","type": "bytes"},{"name": "initialState","type": "bytes"}],"payable": false,"stateMutability": "nonpayable","type": "constructor"}]
[
{
"constant": true,
"inputs": [],
"name": "getVersion",
"outputs": [
{
"name": "",
"type": "uint8"
}
],
"payable": false,
"stateMutability": "pure",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "newState",
"type": "bytes"
},
{
"name": "v",
"type": "uint8[]"
},
{
"name": "r",
"type": "bytes32[]"
},
{
"name": "s",
"type": "bytes32[]"
}
],
"name": "setState",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "code",
"outputs": [
{
"name": "",
"type": "bytes"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "",
"type": "uint256"
}
],
"name": "validators",
"outputs": [
{
"name": "",
"type": "address"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "changesOriginator",
"type": "address"
},
{
"name": "originalTransactionHash",
"type": "bytes"
}
],
"name": "notifyChanges",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "nonce",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "getValidators",
"outputs": [
{
"name": "",
"type": "address[]"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "state",
"outputs": [
{
"name": "",
"type": "bytes"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"name": "initialValidators",
"type": "address[]"
},
{
"name": "initialCode",
"type": "bytes"
},
{
"name": "initialState",
"type": "bytes"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"anonymous": false,
"inputs": [
{
"indexed": false,
"name": "changesOriginator",
"type": "address"
},
{
"indexed": false,
"name": "originalTransactionHash",
"type": "bytes"
}
],
"name": "PrivateStateChanged",
"type": "event"
}
]

159
ethcore/private-tx/src/lib.rs
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@ -103,6 +103,12 @@ const INIT_VEC_LEN: usize = 16;
/// Size of nonce cache
const NONCE_CACHE_SIZE: usize = 128;
/// Version for the initial private contract wrapper
const INITIAL_PRIVATE_CONTRACT_VER: usize = 1;
/// Version for the private contract notification about private state changes added
const PRIVATE_CONTRACT_WITH_NOTIFICATION_VER: usize = 2;
/// Configurtion for private transaction provider
#[derive(Default, PartialEq, Debug, Clone)]
pub struct ProviderConfig {
@ -199,36 +205,30 @@ impl Provider where {
bail!(ErrorKind::SignerAccountNotSet);
}
let tx_hash = signed_transaction.hash();
match signed_transaction.action {
Action::Create => {
bail!(ErrorKind::BadTransactonType);
}
Action::Call(contract) => {
let data = signed_transaction.rlp_bytes();
let encrypted_transaction = self.encrypt(&contract, &Self::iv_from_transaction(&signed_transaction), &data)?;
let private = PrivateTransaction::new(encrypted_transaction, contract);
// TODO [ToDr] Using BlockId::Latest is bad here,
// the block may change in the middle of execution
// causing really weird stuff to happen.
// We should retrieve hash and stick to that. IMHO
// best would be to change the API and only allow H256 instead of BlockID
// in private-tx to avoid such mistakes.
let contract_nonce = self.get_contract_nonce(&contract, BlockId::Latest)?;
let private_state = self.execute_private_transaction(BlockId::Latest, &signed_transaction)?;
trace!(target: "privatetx", "Private transaction created, encrypted transaction: {:?}, private state: {:?}", private, private_state);
let contract_validators = self.get_validators(BlockId::Latest, &contract)?;
trace!(target: "privatetx", "Required validators: {:?}", contract_validators);
let private_state_hash = self.calculate_state_hash(&private_state, contract_nonce);
trace!(target: "privatetx", "Hashed effective private state for sender: {:?}", private_state_hash);
self.transactions_for_signing.write().add_transaction(private.hash(), signed_transaction, contract_validators, private_state, contract_nonce)?;
self.broadcast_private_transaction(private.hash(), private.rlp_bytes());
Ok(Receipt {
hash: tx_hash,
contract_address: Some(contract),
status_code: 0,
})
}
}
let contract = Self::contract_address_from_transaction(&signed_transaction).map_err(|_| ErrorKind::BadTransactonType)?;
let data = signed_transaction.rlp_bytes();
let encrypted_transaction = self.encrypt(&contract, &Self::iv_from_transaction(&signed_transaction), &data)?;
let private = PrivateTransaction::new(encrypted_transaction, contract);
// TODO #9825 [ToDr] Using BlockId::Latest is bad here,
// the block may change in the middle of execution
// causing really weird stuff to happen.
// We should retrieve hash and stick to that. IMHO
// best would be to change the API and only allow H256 instead of BlockID
// in private-tx to avoid such mistakes.
let contract_nonce = self.get_contract_nonce(&contract, BlockId::Latest)?;
let private_state = self.execute_private_transaction(BlockId::Latest, &signed_transaction)?;
trace!(target: "privatetx", "Private transaction created, encrypted transaction: {:?}, private state: {:?}", private, private_state);
let contract_validators = self.get_validators(BlockId::Latest, &contract)?;
trace!(target: "privatetx", "Required validators: {:?}", contract_validators);
let private_state_hash = self.calculate_state_hash(&private_state, contract_nonce);
trace!(target: "privatetx", "Hashed effective private state for sender: {:?}", private_state_hash);
self.transactions_for_signing.write().add_transaction(private.hash(), signed_transaction, contract_validators, private_state, contract_nonce)?;
self.broadcast_private_transaction(private.hash(), private.rlp_bytes());
Ok(Receipt {
hash: tx_hash,
contract_address: Some(contract),
status_code: 0,
})
}
/// Calculate hash from united private state and contract nonce
@ -269,33 +269,30 @@ impl Provider where {
self.broadcast_private_transaction(private_hash, transaction.private_transaction.rlp_bytes());
return Ok(());
}
let tx_action = transaction.transaction.action.clone();
if let Action::Call(contract) = tx_action {
// TODO [ToDr] Usage of BlockId::Latest
let contract_nonce = self.get_contract_nonce(&contract, BlockId::Latest);
if let Err(e) = contract_nonce {
bail!("Cannot retrieve contract nonce: {:?}", e);
}
let contract_nonce = contract_nonce.expect("Error was checked before");
let private_state = self.execute_private_transaction(BlockId::Latest, &transaction.transaction);
if let Err(e) = private_state {
bail!("Cannot retrieve private state: {:?}", e);
}
let private_state = private_state.expect("Error was checked before");
let private_state_hash = self.calculate_state_hash(&private_state, contract_nonce);
trace!(target: "privatetx", "Hashed effective private state for validator: {:?}", private_state_hash);
let password = find_account_password(&self.passwords, &*self.accounts, &validator_account);
let signed_state = self.accounts.sign(validator_account, password, private_state_hash);
if let Err(e) = signed_state {
bail!("Cannot sign the state: {:?}", e);
}
let signed_state = signed_state.expect("Error was checked before");
let signed_private_transaction = SignedPrivateTransaction::new(private_hash, signed_state, None);
trace!(target: "privatetx", "Sending signature for private transaction: {:?}", signed_private_transaction);
self.broadcast_signed_private_transaction(signed_private_transaction.hash(), signed_private_transaction.rlp_bytes());
} else {
bail!("Incorrect type of action for the transaction");
let contract = Self::contract_address_from_transaction(&transaction.transaction)
.map_err(|_| "Incorrect type of action for the transaction")?;
// TODO #9825 [ToDr] Usage of BlockId::Latest
let contract_nonce = self.get_contract_nonce(&contract, BlockId::Latest);
if let Err(e) = contract_nonce {
bail!("Cannot retrieve contract nonce: {:?}", e);
}
let contract_nonce = contract_nonce.expect("Error was checked before");
let private_state = self.execute_private_transaction(BlockId::Latest, &transaction.transaction);
if let Err(e) = private_state {
bail!("Cannot retrieve private state: {:?}", e);
}
let private_state = private_state.expect("Error was checked before");
let private_state_hash = self.calculate_state_hash(&private_state, contract_nonce);
trace!(target: "privatetx", "Hashed effective private state for validator: {:?}", private_state_hash);
let password = find_account_password(&self.passwords, &*self.accounts, &validator_account);
let signed_state = self.accounts.sign(validator_account, password, private_state_hash);
if let Err(e) = signed_state {
bail!("Cannot sign the state: {:?}", e);
}
let signed_state = signed_state.expect("Error was checked before");
let signed_private_transaction = SignedPrivateTransaction::new(private_hash, signed_state, None);
trace!(target: "privatetx", "Sending signature for private transaction: {:?}", signed_private_transaction);
self.broadcast_signed_private_transaction(signed_private_transaction.hash(), signed_private_transaction.rlp_bytes());
}
}
Ok(())
@ -328,7 +325,7 @@ impl Provider where {
let mut signatures = desc.received_signatures.clone();
signatures.push(signed_tx.signature());
let rsv: Vec<Signature> = signatures.into_iter().map(|sign| sign.into_electrum().into()).collect();
//Create public transaction
// Create public transaction
let public_tx = self.public_transaction(
desc.state.clone(),
&desc.original_transaction,
@ -337,7 +334,7 @@ impl Provider where {
desc.original_transaction.gas_price
)?;
trace!(target: "privatetx", "Last required signature received, public transaction created: {:?}", public_tx);
//Sign and add it to the queue
// Sign and add it to the queue
let chain_id = desc.original_transaction.chain_id();
let hash = public_tx.hash(chain_id);
let signer_account = self.signer_account.ok_or_else(|| ErrorKind::SignerAccountNotSet)?;
@ -351,13 +348,22 @@ impl Provider where {
bail!(err);
}
}
//Remove from store for signing
// Notify about state changes
let contract = Self::contract_address_from_transaction(&desc.original_transaction)?;
// TODO #9825 Usage of BlockId::Latest
if self.get_contract_version(BlockId::Latest, &contract) >= PRIVATE_CONTRACT_WITH_NOTIFICATION_VER {
match self.state_changes_notify(BlockId::Latest, &contract, &desc.original_transaction.sender(), desc.original_transaction.hash()) {
Ok(_) => trace!(target: "privatetx", "Notification about private state changes sent"),
Err(err) => warn!(target: "privatetx", "Failed to send private state changed notification, error: {:?}", err),
}
}
// Remove from store for signing
if let Err(err) = self.transactions_for_signing.write().remove(&private_hash) {
warn!(target: "privatetx", "Failed to remove transaction from signing store, error: {:?}", err);
bail!(err);
}
} else {
//Add signature to the store
// Add signature to the store
match self.transactions_for_signing.write().add_signature(&private_hash, signed_tx.signature()) {
Ok(_) => trace!(target: "privatetx", "Signature stored for private transaction"),
Err(err) => {
@ -369,6 +375,16 @@ impl Provider where {
Ok(())
}
fn contract_address_from_transaction(transaction: &SignedTransaction) -> Result<Address, Error> {
match transaction.action {
Action::Call(contract) => Ok(contract),
_ => {
warn!(target: "privatetx", "Incorrect type of action for the transaction");
bail!(ErrorKind::BadTransactonType);
}
}
}
fn last_required_signature(&self, desc: &PrivateTransactionSigningDesc, sign: Signature) -> Result<bool, Error> {
if desc.received_signatures.contains(&sign) {
return Ok(false);
@ -474,7 +490,7 @@ impl Provider where {
env_info.gas_limit = transaction.gas;
let mut state = self.client.state_at(block).ok_or(ErrorKind::StatePruned)?;
// TODO: in case of BlockId::Latest these need to operate on the same state
// TODO #9825 in case of BlockId::Latest these need to operate on the same state
let contract_address = match transaction.action {
Action::Call(ref contract_address) => {
let contract_code = Arc::new(self.get_decrypted_code(contract_address, block)?);
@ -536,7 +552,7 @@ impl Provider where {
/// Returns the key from the key server associated with the contract
pub fn contract_key_id(&self, contract_address: &Address) -> Result<H256, Error> {
//current solution uses contract address extended with 0 as id
// Current solution uses contract address extended with 0 as id
let contract_address_extended: H256 = contract_address.into();
Ok(H256::from_slice(&contract_address_extended))
@ -615,6 +631,21 @@ impl Provider where {
let value = self.client.call_contract(block, *address, data)?;
decoder.decode(&value).map_err(|e| ErrorKind::Call(format!("Contract call failed {:?}", e)).into())
}
fn get_contract_version(&self, block: BlockId, address: &Address) -> usize {
let (data, decoder) = private_contract::functions::get_version::call();
match self.client.call_contract(block, *address, data)
.and_then(|value| decoder.decode(&value).map_err(|e| e.to_string())) {
Ok(version) => version.low_u64() as usize,
Err(_) => INITIAL_PRIVATE_CONTRACT_VER,
}
}
fn state_changes_notify(&self, block: BlockId, address: &Address, originator: &Address, transaction_hash: H256) -> Result<(), Error> {
let (data, _) = private_contract::functions::notify_changes::call(*originator, transaction_hash.0.to_vec());
let _value = self.client.call_contract(block, *address, data)?;
Ok(())
}
}
pub trait Importer {
@ -644,12 +675,12 @@ impl Importer for Arc<Provider> {
.iter()
.find(|address| self.validator_accounts.contains(address));
//extract the original transaction
// Extract the original transaction
let encrypted_data = private_tx.encrypted();
let transaction_bytes = self.decrypt(&contract, &encrypted_data)?;
let original_tx: UnverifiedTransaction = Rlp::new(&transaction_bytes).as_val()?;
let nonce_cache = NonceCache::new(NONCE_CACHE_SIZE);
//add to the queue for further verification
// Add to the queue for further verification
self.transactions_for_verification.add_transaction(
original_tx,
validation_account.map(|&account| account),