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#![forbid(unsafe_code)]
use crate::{
execution_strategies::types::{Block, Executor, ExecutorResult, PartitionStrategy},
executor::FakeExecutor,
};
use diem_types::{transaction::SignedTransaction, vm_status::VMStatus};
use rand::{
rngs::{OsRng, StdRng},
Rng, SeedableRng,
};
#[derive(Debug, Clone)]
pub struct RandomizedStrategy {
gen: StdRng,
}
impl RandomizedStrategy {
pub fn from_seed(seed: [u8; 32]) -> Self {
Self {
gen: StdRng::from_seed(seed),
}
}
pub fn from_os_rng() -> Self {
let mut seed_rng = OsRng;
let seed: [u8; 32] = seed_rng.gen();
Self::from_seed(seed)
}
}
impl PartitionStrategy for RandomizedStrategy {
type Txn = SignedTransaction;
fn partition(&mut self, mut block: Block<Self::Txn>) -> Vec<Block<SignedTransaction>> {
let mut blocks = vec![];
while !block.is_empty() {
let block_size = self.gen.gen_range(0..block.len());
let new_block: Vec<_> = block.drain(0..block_size + 1).collect();
blocks.push(new_block);
}
blocks
}
}
#[derive(Debug)]
pub struct RandomExecutor {
strategy: RandomizedStrategy,
executor: FakeExecutor,
}
impl RandomExecutor {
pub fn from_seed(seed: [u8; 32]) -> Self {
Self {
executor: FakeExecutor::from_genesis_file(),
strategy: RandomizedStrategy::from_seed(seed),
}
}
pub fn from_os_rng() -> Self {
RandomExecutor::from_seed(OsRng.gen::<[u8; 32]>())
}
}
impl Executor for RandomExecutor {
type Txn = SignedTransaction;
type BlockResult = VMStatus;
fn execute_block(&mut self, block: Block<Self::Txn>) -> ExecutorResult<Self::BlockResult> {
let blocks = self.strategy.partition(block);
let mut results = vec![];
for block in blocks.into_iter() {
results.extend(
self.executor
.execute_block(block)?
.into_iter()
.map(|output| {
self.executor.apply_write_set(output.write_set());
output
}),
)
}
Ok(results)
}
}