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Merge branch 'master' into secret-store

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This commit is contained in:
Nikolay Volf
2016-02-14 16:01:29 +03:00
parent 91c6b6e2c1 c1ab00d915
commit ae5ec6bad9
39 changed files with 362 additions and 305 deletions
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2
ethcore/Cargo.toml
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@@ -18,7 +18,7 @@ ethcore-util = { path = "../util" }
evmjit = { path = "../evmjit", optional = true }
ethash = { path = "../ethash" }
num_cpus = "0.2"
clippy = "0.0.37"
clippy = "0.0.41"
crossbeam = "0.1.5"
lazy_static = "0.1"

2
ethcore/res/ethereum/frontier.json
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@@ -3,7 +3,7 @@
"engineName": "Ethash",
"params": {
"accountStartNonce": "0x00",
"frontierCompatibilityModeLimit": "0xf4240",
"frontierCompatibilityModeLimit": "0xf4240fff",
"maximumExtraDataSize": "0x20",
"tieBreakingGas": false,
"minGasLimit": "0x1388",

2
ethcore/res/ethereum/frontier_like_test.json
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@@ -3,7 +3,7 @@
"engineName": "Ethash",
"params": {
"accountStartNonce": "0x00",
"frontierCompatibilityModeLimit": "0xf4240",
"frontierCompatibilityModeLimit": "0xf4240fff",
"maximumExtraDataSize": "0x20",
"tieBreakingGas": false,
"minGasLimit": "0x1388",

12
ethcore/src/account_diff.rs
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@@ -72,14 +72,14 @@ impl AccountDiff {
pub fn diff_pod(pre: Option<&PodAccount>, post: Option<&PodAccount>) -> Option<AccountDiff> {
match (pre, post) {
(None, Some(x)) => Some(AccountDiff {
balance: Diff::Born(x.balance.clone()),
nonce: Diff::Born(x.nonce.clone()),
balance: Diff::Born(x.balance),
nonce: Diff::Born(x.nonce),
code: Diff::Born(x.code.clone()),
storage: x.storage.iter().map(|(k, v)| (k.clone(), Diff::Born(v.clone()))).collect(),
}),
(Some(x), None) => Some(AccountDiff {
balance: Diff::Died(x.balance.clone()),
nonce: Diff::Died(x.nonce.clone()),
balance: Diff::Died(x.balance),
nonce: Diff::Died(x.nonce),
code: Diff::Died(x.code.clone()),
storage: x.storage.iter().map(|(k, v)| (k.clone(), Diff::Died(v.clone()))).collect(),
}),
@@ -88,8 +88,8 @@ impl AccountDiff {
.filter(|k| pre.storage.get(k).unwrap_or(&H256::new()) != post.storage.get(k).unwrap_or(&H256::new()))
.collect();
let r = AccountDiff {
balance: Diff::new(pre.balance.clone(), post.balance.clone()),
nonce: Diff::new(pre.nonce.clone(), post.nonce.clone()),
balance: Diff::new(pre.balance, post.balance),
nonce: Diff::new(pre.nonce, post.nonce),
code: Diff::new(pre.code.clone(), post.code.clone()),
storage: storage.into_iter().map(|k|
(k.clone(), Diff::new(

34
ethcore/src/blockchain.rs
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@@ -23,24 +23,6 @@ use extras::*;
use transaction::*;
use views::*;
/// Uniquely identifies block.
pub enum BlockId {
/// Block's sha3.
/// Querying by hash is always faster.
Hash(H256),
/// Block number within canon blockchain.
Number(BlockNumber)
}
/// Uniquely identifies transaction.
pub enum TransactionId {
/// Transaction's sha3.
Hash(H256),
/// Block id and transaction index within this block.
/// Querying by block position is always faster.
Location(BlockId, usize)
}
/// Represents a tree route between `from` block and `to` block:
pub struct TreeRoute {
/// A vector of hashes of all blocks, ordered from `from` to `to`.
@@ -129,18 +111,8 @@ pub trait BlockProvider {
}
/// Get transaction with given transaction hash.
fn transaction(&self, id: TransactionId) -> Option<LocalizedTransaction> {
match id {
TransactionId::Hash(ref hash) => self.transaction_address(hash),
TransactionId::Location(BlockId::Hash(hash), index) => Some(TransactionAddress {
block_hash: hash,
index: index
}),
TransactionId::Location(BlockId::Number(number), index) => self.block_hash(number).map(|hash| TransactionAddress {
block_hash: hash,
index: index
})
}.and_then(|address| self.block(&address.block_hash).and_then(|bytes| BlockView::new(&bytes).localized_transaction_at(address.index)))
fn transaction(&self, address: &TransactionAddress) -> Option<LocalizedTransaction> {
self.block(&address.block_hash).and_then(|bytes| BlockView::new(&bytes).localized_transaction_at(address.index))
}
/// Get a list of transactions for a given block.
@@ -887,7 +859,7 @@ mod tests {
let transactions = bc.transactions(&b1_hash).unwrap();
assert_eq!(transactions.len(), 7);
for t in transactions {
assert_eq!(bc.transaction(TransactionId::Hash(t.hash())).unwrap(), t);
assert_eq!(bc.transaction(&bc.transaction_address(&t.hash()).unwrap()).unwrap(), t);
}
}
}

158
ethcore/src/client.rs
View File

@@ -19,7 +19,7 @@
use util::*;
use util::panics::*;
use rocksdb::{Options, DB, DBCompactionStyle};
use blockchain::{BlockChain, BlockProvider, CacheSize, TransactionId};
use blockchain::{BlockChain, BlockProvider, CacheSize};
use views::BlockView;
use error::*;
use header::BlockNumber;
@@ -33,8 +33,33 @@ use env_info::LastHashes;
use verification::*;
use block::*;
use transaction::LocalizedTransaction;
use extras::TransactionAddress;
pub use blockchain::TreeRoute;
/// Uniquely identifies block.
#[derive(Debug, PartialEq, Clone)]
pub enum BlockId {
/// Block's sha3.
/// Querying by hash is always faster.
Hash(H256),
/// Block number within canon blockchain.
Number(BlockNumber),
/// Earliest block (genesis).
Earliest,
/// Latest mined block.
Latest
}
/// Uniquely identifies transaction.
#[derive(Debug, PartialEq, Clone)]
pub enum TransactionId {
/// Transaction's sha3.
Hash(H256),
/// Block id and transaction index within this block.
/// Querying by block position is always faster.
Location(BlockId, usize)
}
/// General block status
#[derive(Debug, Eq, PartialEq)]
pub enum BlockStatus {
@@ -71,41 +96,25 @@ impl fmt::Display for BlockChainInfo {
/// Blockchain database client. Owns and manages a blockchain and a block queue.
pub trait BlockChainClient : Sync + Send {
/// Get raw block header data by block header hash.
fn block_header(&self, hash: &H256) -> Option<Bytes>;
/// Get raw block header data by block id.
fn block_header(&self, id: BlockId) -> Option<Bytes>;
/// Get raw block body data by block header hash.
/// Get raw block body data by block id.
/// Block body is an RLP list of two items: uncles and transactions.
fn block_body(&self, hash: &H256) -> Option<Bytes>;
fn block_body(&self, id: BlockId) -> Option<Bytes>;
/// Get raw block data by block header hash.
fn block(&self, hash: &H256) -> Option<Bytes>;
fn block(&self, id: BlockId) -> Option<Bytes>;
/// Get block status by block header hash.
fn block_status(&self, hash: &H256) -> BlockStatus;
fn block_status(&self, id: BlockId) -> BlockStatus;
/// Get block total difficulty.
fn block_total_difficulty(&self, hash: &H256) -> Option<U256>;
fn block_total_difficulty(&self, id: BlockId) -> Option<U256>;
/// Get address code.
fn code(&self, address: &Address) -> Option<Bytes>;
/// Get raw block header data by block number.
fn block_header_at(&self, n: BlockNumber) -> Option<Bytes>;
/// Get raw block body data by block number.
/// Block body is an RLP list of two items: uncles and transactions.
fn block_body_at(&self, n: BlockNumber) -> Option<Bytes>;
/// Get raw block data by block number.
fn block_at(&self, n: BlockNumber) -> Option<Bytes>;
/// Get block status by block number.
fn block_status_at(&self, n: BlockNumber) -> BlockStatus;
/// Get block total difficulty.
fn block_total_difficulty_at(&self, n: BlockNumber) -> Option<U256>;
/// Get transaction with given hash.
fn transaction(&self, id: TransactionId) -> Option<LocalizedTransaction>;
@@ -133,7 +142,7 @@ pub trait BlockChainClient : Sync + Send {
/// Get the best block header.
fn best_block_header(&self) -> Bytes {
self.block_header(&self.chain_info().best_block_hash).unwrap()
self.block_header(BlockId::Hash(self.chain_info().best_block_hash)).unwrap()
}
}
@@ -170,7 +179,7 @@ pub struct Client {
}
const HISTORY: u64 = 1000;
const CLIENT_DB_VER_STR: &'static str = "2.0";
const CLIENT_DB_VER_STR: &'static str = "2.1";
impl Client {
/// Create a new client with given spec and DB path.
@@ -307,12 +316,11 @@ impl Client {
self.report.write().unwrap().accrue_block(&block);
trace!(target: "client", "Imported #{} ({})", header.number(), header.hash());
ret += 1;
if self.block_queue.read().unwrap().queue_info().is_empty() {
io.send(NetworkIoMessage::User(SyncMessage::BlockVerified)).unwrap();
}
}
self.block_queue.write().unwrap().mark_as_good(&good_blocks);
if !good_blocks.is_empty() && self.block_queue.read().unwrap().queue_info().is_empty() {
io.send(NetworkIoMessage::User(SyncMessage::BlockVerified)).unwrap();
}
ret
}
@@ -340,68 +348,70 @@ impl Client {
pub fn configure_cache(&self, pref_cache_size: usize, max_cache_size: usize) {
self.chain.write().unwrap().configure_cache(pref_cache_size, max_cache_size);
}
fn block_hash(chain: &BlockChain, id: BlockId) -> Option<H256> {
match id {
BlockId::Hash(hash) => Some(hash),
BlockId::Number(number) => chain.block_hash(number),
BlockId::Earliest => chain.block_hash(0),
BlockId::Latest => Some(chain.best_block_hash())
}
}
}
impl BlockChainClient for Client {
fn block_header(&self, hash: &H256) -> Option<Bytes> {
self.chain.read().unwrap().block(hash).map(|bytes| BlockView::new(&bytes).rlp().at(0).as_raw().to_vec())
fn block_header(&self, id: BlockId) -> Option<Bytes> {
let chain = self.chain.read().unwrap();
Self::block_hash(&chain, id).and_then(|hash| chain.block(&hash).map(|bytes| BlockView::new(&bytes).rlp().at(0).as_raw().to_vec()))
}
fn block_body(&self, hash: &H256) -> Option<Bytes> {
self.chain.read().unwrap().block(hash).map(|bytes| {
let rlp = Rlp::new(&bytes);
let mut body = RlpStream::new();
body.append_raw(rlp.at(1).as_raw(), 1);
body.append_raw(rlp.at(2).as_raw(), 1);
body.out()
fn block_body(&self, id: BlockId) -> Option<Bytes> {
let chain = self.chain.read().unwrap();
Self::block_hash(&chain, id).and_then(|hash| {
chain.block(&hash).map(|bytes| {
let rlp = Rlp::new(&bytes);
let mut body = RlpStream::new_list(2);
body.append_raw(rlp.at(1).as_raw(), 1);
body.append_raw(rlp.at(2).as_raw(), 1);
body.out()
})
})
}
fn block(&self, hash: &H256) -> Option<Bytes> {
self.chain.read().unwrap().block(hash)
fn block(&self, id: BlockId) -> Option<Bytes> {
let chain = self.chain.read().unwrap();
Self::block_hash(&chain, id).and_then(|hash| {
chain.block(&hash)
})
}
fn block_status(&self, hash: &H256) -> BlockStatus {
if self.chain.read().unwrap().is_known(&hash) {
BlockStatus::InChain
} else {
self.block_queue.read().unwrap().block_status(hash)
fn block_status(&self, id: BlockId) -> BlockStatus {
let chain = self.chain.read().unwrap();
match Self::block_hash(&chain, id) {
Some(ref hash) if chain.is_known(hash) => BlockStatus::InChain,
Some(hash) => self.block_queue.read().unwrap().block_status(&hash),
None => BlockStatus::Unknown
}
}
fn block_total_difficulty(&self, hash: &H256) -> Option<U256> {
self.chain.read().unwrap().block_details(hash).map(|d| d.total_difficulty)
fn block_total_difficulty(&self, id: BlockId) -> Option<U256> {
let chain = self.chain.read().unwrap();
Self::block_hash(&chain, id).and_then(|hash| chain.block_details(&hash)).map(|d| d.total_difficulty)
}
fn code(&self, address: &Address) -> Option<Bytes> {
self.state().code(address)
}
fn block_header_at(&self, n: BlockNumber) -> Option<Bytes> {
self.chain.read().unwrap().block_hash(n).and_then(|h| self.block_header(&h))
}
fn block_body_at(&self, n: BlockNumber) -> Option<Bytes> {
self.chain.read().unwrap().block_hash(n).and_then(|h| self.block_body(&h))
}
fn block_at(&self, n: BlockNumber) -> Option<Bytes> {
self.chain.read().unwrap().block_hash(n).and_then(|h| self.block(&h))
}
fn block_status_at(&self, n: BlockNumber) -> BlockStatus {
match self.chain.read().unwrap().block_hash(n) {
Some(h) => self.block_status(&h),
None => BlockStatus::Unknown
}
}
fn block_total_difficulty_at(&self, n: BlockNumber) -> Option<U256> {
self.chain.read().unwrap().block_hash(n).and_then(|h| self.block_total_difficulty(&h))
}
fn transaction(&self, id: TransactionId) -> Option<LocalizedTransaction> {
self.chain.read().unwrap().transaction(id)
let chain = self.chain.read().unwrap();
match id {
TransactionId::Hash(ref hash) => chain.transaction_address(hash),
TransactionId::Location(id, index) => Self::block_hash(&chain, id).map(|hash| TransactionAddress {
block_hash: hash,
index: index
})
}.and_then(|address| chain.transaction(&address))
}
fn tree_route(&self, from: &H256, to: &H256) -> Option<TreeRoute> {
@@ -421,7 +431,7 @@ impl BlockChainClient for Client {
if self.chain.read().unwrap().is_known(&header.hash()) {
return Err(ImportError::AlreadyInChain);
}
if self.block_status(&header.parent_hash) == BlockStatus::Unknown {
if self.block_status(BlockId::Hash(header.parent_hash)) == BlockStatus::Unknown {
return Err(ImportError::UnknownParent);
}
self.block_queue.write().unwrap().import_block(bytes)

2
ethcore/src/ethereum/ethash.rs
View File

@@ -274,7 +274,7 @@ mod tests {
use block::*;
use engine::*;
use tests::helpers::*;
use super::*;
use super::{Ethash};
use super::super::new_morden;
#[test]

2
ethcore/src/ethereum/mod.rs
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@@ -24,7 +24,7 @@ pub mod ethash;
/// Export the denominations module.
pub mod denominations;
pub use self::ethash::*;
pub use self::ethash::{Ethash};
pub use self::denominations::*;
use super::spec::*;

8
ethcore/src/evm/interpreter.rs
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@@ -391,10 +391,7 @@ impl Interpreter {
instructions::SLOAD => {
InstructionCost::Gas(U256::from(schedule.sload_gas))
},
instructions::MSTORE => {
InstructionCost::GasMem(default_gas, try!(self.mem_needed_const(stack.peek(0), 32)))
},
instructions::MLOAD => {
instructions::MSTORE | instructions::MLOAD => {
InstructionCost::GasMem(default_gas, try!(self.mem_needed_const(stack.peek(0), 32)))
},
instructions::MSTORE8 => {
@@ -736,8 +733,7 @@ impl Interpreter {
},
instructions::CALLVALUE => {
stack.push(match params.value {
ActionValue::Transfer(val) => val,
ActionValue::Apparent(val) => val,
ActionValue::Transfer(val) | ActionValue::Apparent(val) => val
});
},
instructions::CALLDATALOAD => {

12
ethcore/src/evm/tests.rs
View File

@@ -84,7 +84,7 @@ impl Ext for FakeExt {
}
fn balance(&self, address: &Address) -> U256 {
self.balances.get(address).unwrap().clone()
*self.balances.get(address).unwrap()
}
fn blockhash(&self, number: &U256) -> H256 {
@@ -94,10 +94,10 @@ impl Ext for FakeExt {
fn create(&mut self, gas: &U256, value: &U256, code: &[u8]) -> ContractCreateResult {
self.calls.insert(FakeCall {
call_type: FakeCallType::CREATE,
gas: gas.clone(),
gas: *gas,
sender_address: None,
receive_address: None,
value: Some(value.clone()),
value: Some(*value),
data: code.to_vec(),
code_address: None
});
@@ -115,14 +115,14 @@ impl Ext for FakeExt {
self.calls.insert(FakeCall {
call_type: FakeCallType::CALL,
gas: gas.clone(),
gas: *gas,
sender_address: Some(sender_address.clone()),
receive_address: Some(receive_address.clone()),
value: value,
data: data.to_vec(),
code_address: Some(code_address.clone())
});
MessageCallResult::Success(gas.clone())
MessageCallResult::Success(*gas)
}
fn extcode(&self, address: &Address) -> Bytes {
@@ -898,7 +898,7 @@ fn test_calls(factory: super::Factory) {
let mut ext = FakeExt::new();
ext.balances = {
let mut s = HashMap::new();
s.insert(params.address.clone(), params.gas.clone());
s.insert(params.address.clone(), params.gas);
s
};

13
ethcore/src/externalities.rs
View File

@@ -45,10 +45,9 @@ impl OriginInfo {
OriginInfo {
address: params.address.clone(),
origin: params.origin.clone(),
gas_price: params.gas_price.clone(),
gas_price: params.gas_price,
value: match params.value {
ActionValue::Transfer(val) => val,
ActionValue::Apparent(val) => val,
ActionValue::Transfer(val) | ActionValue::Apparent(val) => val
}
}
}
@@ -133,8 +132,8 @@ impl<'a> Ext for Externalities<'a> {
sender: self.origin_info.address.clone(),
origin: self.origin_info.origin.clone(),
gas: *gas,
gas_price: self.origin_info.gas_price.clone(),
value: ActionValue::Transfer(value.clone()),
gas_price: self.origin_info.gas_price,
value: ActionValue::Transfer(*value),
code: Some(code.to_vec()),
data: None,
};
@@ -164,11 +163,11 @@ impl<'a> Ext for Externalities<'a> {
let mut params = ActionParams {
sender: sender_address.clone(),
address: receive_address.clone(),
value: ActionValue::Apparent(self.origin_info.value.clone()),
value: ActionValue::Apparent(self.origin_info.value),
code_address: code_address.clone(),
origin: self.origin_info.origin.clone(),
gas: *gas,
gas_price: self.origin_info.gas_price.clone(),
gas_price: self.origin_info.gas_price,
code: self.state.code(code_address),
data: Some(data.to_vec()),
};

2
ethcore/src/json_tests/state.rs
View File

@@ -115,7 +115,7 @@ declare_test!{StateTests_stSolidityTest, "StateTests/stSolidityTest"}
declare_test!{StateTests_stSpecialTest, "StateTests/stSpecialTest"}
declare_test!{StateTests_stSystemOperationsTest, "StateTests/stSystemOperationsTest"}
declare_test!{StateTests_stTransactionTest, "StateTests/stTransactionTest"}
declare_test!{StateTests_stTransitionTest, "StateTests/stTransitionTest"}
//declare_test!{StateTests_stTransitionTest, "StateTests/stTransitionTest"}
declare_test!{StateTests_stWalletTest, "StateTests/stWalletTest"}

4
ethcore/src/pod_account.rs
View File

@@ -43,8 +43,8 @@ impl PodAccount {
/// NOTE: This will silently fail unless the account is fully cached.
pub fn from_account(acc: &Account) -> PodAccount {
PodAccount {
balance: acc.balance().clone(),
nonce: acc.nonce().clone(),
balance: *acc.balance(),
nonce: *acc.nonce(),
storage: acc.storage_overlay().iter().fold(BTreeMap::new(), |mut m, (k, &(_, ref v))| {m.insert(k.clone(), v.clone()); m}),
code: acc.code().unwrap().to_vec(),
}

10
ethcore/src/service.rs
View File

@@ -20,7 +20,6 @@ use util::*;
use util::panics::*;
use spec::Spec;
use error::*;
use std::env;
use client::Client;
/// Message type for external and internal events
@@ -44,16 +43,14 @@ pub struct ClientService {
impl ClientService {
/// Start the service in a separate thread.
pub fn start(spec: Spec, net_config: NetworkConfiguration) -> Result<ClientService, Error> {
pub fn start(spec: Spec, net_config: NetworkConfiguration, db_path: &Path) -> Result<ClientService, Error> {
let panic_handler = PanicHandler::new_in_arc();
let mut net_service = try!(NetworkService::start(net_config));
panic_handler.forward_from(&net_service);
info!("Starting {}", net_service.host_info());
info!("Configured for {} using {} engine", spec.name, spec.engine_name);
let mut dir = env::home_dir().unwrap();
dir.push(".parity");
let client = try!(Client::new(spec, &dir, net_service.io().channel()));
let client = try!(Client::new(spec, db_path, net_service.io().channel()));
panic_handler.forward_from(client.deref());
let client_io = Arc::new(ClientIoHandler {
client: client.clone()
@@ -136,7 +133,8 @@ mod tests {
#[test]
fn it_can_be_started() {
let spec = get_test_spec();
let service = ClientService::start(spec, NetworkConfiguration::new());
let temp_path = RandomTempPath::new();
let service = ClientService::start(spec, NetworkConfiguration::new(), &temp_path.as_path());
assert!(service.is_ok());
}
}

4
ethcore/src/state.rs
View File

@@ -153,12 +153,12 @@ impl State {
/// Get the balance of account `a`.
pub fn balance(&self, a: &Address) -> U256 {
self.get(a, false).as_ref().map_or(U256::zero(), |account| account.balance().clone())
self.get(a, false).as_ref().map_or(U256::zero(), |account| *account.balance())
}
/// Get the nonce of account `a`.
pub fn nonce(&self, a: &Address) -> U256 {
self.get(a, false).as_ref().map_or(U256::zero(), |account| account.nonce().clone())
self.get(a, false).as_ref().map_or(U256::zero(), |account| *account.nonce())
}
/// Mutate storage of account `address` so that it is `value` for `key`.

23
ethcore/src/tests/client.rs
View File

@@ -14,7 +14,7 @@
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
use client::{BlockChainClient,Client};
use client::{BlockChainClient, Client, BlockId};
use tests::helpers::*;
use common::*;
@@ -44,7 +44,7 @@ fn imports_good_block() {
client.flush_queue();
client.import_verified_blocks(&IoChannel::disconnected());
let block = client.block_header_at(1).unwrap();
let block = client.block_header(BlockId::Number(1)).unwrap();
assert!(!block.is_empty());
}
@@ -53,7 +53,7 @@ fn query_none_block() {
let dir = RandomTempPath::new();
let client = Client::new(get_test_spec(), dir.as_path(), IoChannel::disconnected()).unwrap();
let non_existant = client.block_header_at(188);
let non_existant = client.block_header(BlockId::Number(188));
assert!(non_existant.is_none());
}
@@ -61,7 +61,7 @@ fn query_none_block() {
fn query_bad_block() {
let client_result = get_test_client_with_blocks(vec![get_bad_state_dummy_block()]);
let client = client_result.reference();
let bad_block:Option<Bytes> = client.block_header_at(1);
let bad_block:Option<Bytes> = client.block_header(BlockId::Number(1));
assert!(bad_block.is_none());
}
@@ -76,11 +76,24 @@ fn returns_chain_info() {
assert_eq!(info.best_block_hash, block.header().hash());
}
#[test]
fn returns_block_body() {
let dummy_block = get_good_dummy_block();
let client_result = get_test_client_with_blocks(vec![dummy_block.clone()]);
let client = client_result.reference();
let block = BlockView::new(&dummy_block);
let body = client.block_body(BlockId::Hash(block.header().hash())).unwrap();
let body = Rlp::new(&body);
assert_eq!(body.item_count(), 2);
assert_eq!(body.at(0).as_raw()[..], block.rlp().at(1).as_raw()[..]);
assert_eq!(body.at(1).as_raw()[..], block.rlp().at(2).as_raw()[..]);
}
#[test]
fn imports_block_sequence() {
let client_result = generate_dummy_client(6);
let client = client_result.reference();
let block = client.block_header_at(5).unwrap();
let block = client.block_header(BlockId::Number(5)).unwrap();
assert!(!block.is_empty());
}