openethereum/ethcore/src/trace/db.rs

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// Copyright 2015-2017 Parity Technologies (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/>.
//! Trace database.
use std::ops::Deref;
use std::collections::{HashMap, VecDeque};
use std::sync::Arc;
use bloomchain::{Number, Config as BloomConfig};
use bloomchain::group::{BloomGroupDatabase, BloomGroupChain, GroupPosition, BloomGroup};
use heapsize::HeapSizeOf;
use ethereum_types::{H256, H264};
use kvdb::{KeyValueDB, DBTransaction};
use parking_lot::RwLock;
use header::BlockNumber;
use trace::{LocalizedTrace, Config, Filter, Database as TraceDatabase, ImportRequest, DatabaseExtras};
use db::{self, Key, Writable, Readable, CacheUpdatePolicy};
use blooms;
use super::flat::{FlatTrace, FlatBlockTraces, FlatTransactionTraces};
use cache_manager::CacheManager;
const TRACE_DB_VER: &'static [u8] = b"1.0";
#[derive(Debug, Copy, Clone)]
enum TraceDBIndex {
/// Block traces index.
BlockTraces = 0,
/// Trace bloom group index.
BloomGroups = 1,
}
impl Key<FlatBlockTraces> for H256 {
type Target = H264;
fn key(&self) -> H264 {
let mut result = H264::default();
result[0] = TraceDBIndex::BlockTraces as u8;
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result[1..33].copy_from_slice(self);
result
}
}
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/// Wrapper around `blooms::GroupPosition` so it could be
/// uniquely identified in the database.
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
struct TraceGroupPosition(blooms::GroupPosition);
impl From<GroupPosition> for TraceGroupPosition {
fn from(position: GroupPosition) -> Self {
TraceGroupPosition(From::from(position))
}
}
impl HeapSizeOf for TraceGroupPosition {
fn heap_size_of_children(&self) -> usize {
0
}
}
/// Helper data structure created cause [u8; 6] does not implement Deref to &[u8].
pub struct TraceGroupKey([u8; 6]);
impl Deref for TraceGroupKey {
type Target = [u8];
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl Key<blooms::BloomGroup> for TraceGroupPosition {
type Target = TraceGroupKey;
fn key(&self) -> Self::Target {
let mut result = [0u8; 6];
result[0] = TraceDBIndex::BloomGroups as u8;
result[1] = self.0.level;
result[2] = self.0.index as u8;
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result[3] = (self.0.index >> 8) as u8;
result[4] = (self.0.index >> 16) as u8;
result[5] = (self.0.index >> 24) as u8;
TraceGroupKey(result)
}
}
#[derive(Debug, Hash, Eq, PartialEq)]
enum CacheId {
Trace(H256),
Bloom(TraceGroupPosition),
}
/// Trace database.
pub struct TraceDB<T> where T: DatabaseExtras {
// cache
traces: RwLock<HashMap<H256, FlatBlockTraces>>,
blooms: RwLock<HashMap<TraceGroupPosition, blooms::BloomGroup>>,
cache_manager: RwLock<CacheManager<CacheId>>,
// db
tracesdb: Arc<KeyValueDB>,
// config,
bloom_config: BloomConfig,
// tracing enabled
enabled: bool,
// extras
extras: Arc<T>,
}
impl<T> BloomGroupDatabase for TraceDB<T> where T: DatabaseExtras {
fn blooms_at(&self, position: &GroupPosition) -> Option<BloomGroup> {
let position = TraceGroupPosition::from(position.clone());
let result = self.tracesdb.read_with_cache(db::COL_TRACE, &self.blooms, &position).map(Into::into);
self.note_used(CacheId::Bloom(position));
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result
}
}
impl<T> TraceDB<T> where T: DatabaseExtras {
/// Creates new instance of `TraceDB`.
pub fn new(config: Config, tracesdb: Arc<KeyValueDB>, extras: Arc<T>) -> Self {
let mut batch = DBTransaction::new();
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let genesis = extras.block_hash(0)
.expect("Genesis block is always inserted upon extras db creation qed");
batch.write(db::COL_TRACE, &genesis, &FlatBlockTraces::default());
batch.put(db::COL_TRACE, b"version", TRACE_DB_VER);
tracesdb.write(batch).expect("failed to update version");
TraceDB {
traces: RwLock::new(HashMap::new()),
blooms: RwLock::new(HashMap::new()),
cache_manager: RwLock::new(CacheManager::new(config.pref_cache_size, config.max_cache_size, 10 * 1024)),
tracesdb: tracesdb,
bloom_config: config.blooms,
enabled: config.enabled,
extras: extras,
}
}
fn cache_size(&self) -> usize {
let traces = self.traces.read().heap_size_of_children();
let blooms = self.blooms.read().heap_size_of_children();
traces + blooms
}
/// Let the cache system know that a cacheable item has been used.
fn note_used(&self, id: CacheId) {
let mut cache_manager = self.cache_manager.write();
cache_manager.note_used(id);
}
/// Ticks our cache system and throws out any old data.
pub fn collect_garbage(&self) {
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let current_size = self.cache_size();
let mut traces = self.traces.write();
let mut blooms = self.blooms.write();
let mut cache_manager = self.cache_manager.write();
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cache_manager.collect_garbage(current_size, | ids | {
for id in &ids {
match *id {
CacheId::Trace(ref h) => { traces.remove(h); },
CacheId::Bloom(ref h) => { blooms.remove(h); },
}
}
traces.shrink_to_fit();
blooms.shrink_to_fit();
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traces.heap_size_of_children() + blooms.heap_size_of_children()
});
}
/// Returns traces for block with hash.
fn traces(&self, block_hash: &H256) -> Option<FlatBlockTraces> {
let result = self.tracesdb.read_with_cache(db::COL_TRACE, &self.traces, block_hash);
self.note_used(CacheId::Trace(block_hash.clone()));
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result
}
/// Returns vector of transaction traces for given block.
fn transactions_traces(&self, block_hash: &H256) -> Option<Vec<FlatTransactionTraces>> {
self.traces(block_hash).map(Into::into)
}
fn matching_block_traces(
&self,
filter: &Filter,
traces: FlatBlockTraces,
block_hash: H256,
block_number: BlockNumber
) -> Vec<LocalizedTrace> {
let tx_traces: Vec<FlatTransactionTraces> = traces.into();
tx_traces.into_iter()
.enumerate()
.flat_map(|(tx_number, tx_trace)| {
self.matching_transaction_traces(filter, tx_trace, block_hash.clone(), block_number, tx_number)
})
.collect()
}
fn matching_transaction_traces(
&self,
filter: &Filter,
traces: FlatTransactionTraces,
block_hash: H256,
block_number: BlockNumber,
tx_number: usize
) -> Vec<LocalizedTrace> {
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let (trace_tx_number, trace_tx_hash) = match self.extras.transaction_hash(block_number, tx_number) {
Some(hash) => (Some(tx_number), Some(hash.clone())),
//None means trace without transaction (reward)
None => (None, None),
};
let flat_traces: Vec<FlatTrace> = traces.into();
flat_traces.into_iter()
.filter_map(|trace| {
match filter.matches(&trace) {
true => Some(LocalizedTrace {
action: trace.action,
result: trace.result,
subtraces: trace.subtraces,
trace_address: trace.trace_address.into_iter().collect(),
transaction_number: trace_tx_number,
transaction_hash: trace_tx_hash,
block_number: block_number,
block_hash: block_hash
}),
false => None
}
})
.collect()
}
}
impl<T> TraceDatabase for TraceDB<T> where T: DatabaseExtras {
fn tracing_enabled(&self) -> bool {
self.enabled
}
/// Traces of import request's enacted blocks are expected to be already in database
/// or to be the currently inserted trace.
fn import(&self, batch: &mut DBTransaction, request: ImportRequest) {
// valid (canon): retracted 0, enacted 1 => false, true,
// valid (branch): retracted 0, enacted 0 => false, false,
// valid (bbcc): retracted 1, enacted 1 => true, true,
// invalid: retracted 1, enacted 0 => true, false,
let ret = request.retracted != 0;
let ena = !request.enacted.is_empty();
assert!(!(ret && !ena));
// fast return if tracing is disabled
if !self.tracing_enabled() {
return;
}
// now let's rebuild the blooms
if !request.enacted.is_empty() {
let range_start = request.block_number as Number + 1 - request.enacted.len();
let range_end = range_start + request.retracted;
let replaced_range = range_start..range_end;
let enacted_blooms = request.enacted
.iter()
// all traces are expected to be found here. That's why `expect` has been used
// instead of `filter_map`. If some traces haven't been found, it meens that
// traces database is corrupted or incomplete.
.map(|block_hash| if block_hash == &request.block_hash {
request.traces.bloom()
} else {
self.traces(block_hash).expect("Traces database is incomplete.").bloom()
})
.collect();
let chain = BloomGroupChain::new(self.bloom_config, self);
let trace_blooms = chain.replace(&replaced_range, enacted_blooms);
let blooms_to_insert = trace_blooms.into_iter()
.map(|p| (From::from(p.0), From::from(p.1)))
.collect::<HashMap<TraceGroupPosition, blooms::BloomGroup>>();
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let blooms_keys: Vec<_> = blooms_to_insert.keys().cloned().collect();
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let mut blooms = self.blooms.write();
batch.extend_with_cache(db::COL_TRACE, &mut *blooms, blooms_to_insert, CacheUpdatePolicy::Remove);
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// note_used must be called after locking blooms to avoid cache/traces deadlock on garbage collection
for key in blooms_keys {
self.note_used(CacheId::Bloom(key));
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}
}
// insert new block traces into the cache and the database
{
let mut traces = self.traces.write();
// it's important to use overwrite here,
// cause this value might be queried by hash later
batch.write_with_cache(db::COL_TRACE, &mut *traces, request.block_hash, request.traces, CacheUpdatePolicy::Overwrite);
// note_used must be called after locking traces to avoid cache/traces deadlock on garbage collection
self.note_used(CacheId::Trace(request.block_hash.clone()));
}
}
fn trace(&self, block_number: BlockNumber, tx_position: usize, trace_position: Vec<usize>) -> Option<LocalizedTrace> {
let trace_position_deq = VecDeque::from(trace_position);
self.extras.block_hash(block_number)
.and_then(|block_hash| self.transactions_traces(&block_hash)
.and_then(|traces| traces.into_iter().nth(tx_position))
.map(Into::<Vec<FlatTrace>>::into)
// this may and should be optimized
.and_then(|traces| traces.into_iter().find(|trace| trace.trace_address == trace_position_deq))
.map(|trace| {
let tx_hash = self.extras.transaction_hash(block_number, tx_position)
.expect("Expected to find transaction hash. Database is probably corrupted");
LocalizedTrace {
action: trace.action,
result: trace.result,
subtraces: trace.subtraces,
trace_address: trace.trace_address.into_iter().collect(),
transaction_number: Some(tx_position),
transaction_hash: Some(tx_hash),
block_number: block_number,
block_hash: block_hash,
}
})
)
}
fn transaction_traces(&self, block_number: BlockNumber, tx_position: usize) -> Option<Vec<LocalizedTrace>> {
self.extras.block_hash(block_number)
.and_then(|block_hash| self.transactions_traces(&block_hash)
.and_then(|traces| traces.into_iter().nth(tx_position))
.map(Into::<Vec<FlatTrace>>::into)
.map(|traces| {
let tx_hash = self.extras.transaction_hash(block_number, tx_position)
.expect("Expected to find transaction hash. Database is probably corrupted");
traces.into_iter()
.map(|trace| LocalizedTrace {
action: trace.action,
result: trace.result,
subtraces: trace.subtraces,
trace_address: trace.trace_address.into_iter().collect(),
transaction_number: Some(tx_position),
transaction_hash: Some(tx_hash.clone()),
block_number: block_number,
block_hash: block_hash
})
.collect()
})
)
}
fn block_traces(&self, block_number: BlockNumber) -> Option<Vec<LocalizedTrace>> {
self.extras.block_hash(block_number)
.and_then(|block_hash| self.transactions_traces(&block_hash)
.map(|traces| {
traces.into_iter()
.map(Into::<Vec<FlatTrace>>::into)
.enumerate()
.flat_map(|(tx_position, traces)| {
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let (trace_tx_number, trace_tx_hash) = match self.extras.transaction_hash(block_number, tx_position) {
Some(hash) => (Some(tx_position), Some(hash.clone())),
//None means trace without transaction (reward)
None => (None, None),
};
traces.into_iter()
.map(|trace| LocalizedTrace {
action: trace.action,
result: trace.result,
subtraces: trace.subtraces,
trace_address: trace.trace_address.into_iter().collect(),
transaction_number: trace_tx_number,
transaction_hash: trace_tx_hash,
block_number: block_number,
block_hash: block_hash,
})
.collect::<Vec<LocalizedTrace>>()
})
.collect::<Vec<LocalizedTrace>>()
})
)
}
fn filter(&self, filter: &Filter) -> Vec<LocalizedTrace> {
let chain = BloomGroupChain::new(self.bloom_config, self);
let numbers = chain.filter(filter);
numbers.into_iter()
.flat_map(|n| {
let number = n as BlockNumber;
let hash = self.extras.block_hash(number)
.expect("Expected to find block hash. Extras db is probably corrupted");
let traces = self.traces(&hash)
.expect("Expected to find a trace. Db is probably corrupted.");
self.matching_block_traces(filter, traces, hash, number)
})
.collect()
}
}
#[cfg(test)]
mod tests {
use std::collections::HashMap;
use std::sync::Arc;
use ethereum_types::{H256, U256, Address};
use kvdb::{DBTransaction, KeyValueDB};
use kvdb_memorydb;
use header::BlockNumber;
use trace::{Config, TraceDB, Database as TraceDatabase, DatabaseExtras, ImportRequest};
use trace::{Filter, LocalizedTrace, AddressesFilter, TraceError};
use trace::trace::{Call, Action, Res};
use trace::flat::{FlatTrace, FlatBlockTraces, FlatTransactionTraces};
use evm::CallType;
struct NoopExtras;
impl DatabaseExtras for NoopExtras {
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fn block_hash(&self, block_number: BlockNumber) -> Option<H256> {
if block_number == 0 {
Some(H256::default())
} else {
unimplemented!()
}
}
fn transaction_hash(&self, _block_number: BlockNumber, _tx_position: usize) -> Option<H256> {
unimplemented!();
}
}
#[derive(Clone)]
struct Extras {
block_hashes: HashMap<BlockNumber, H256>,
transaction_hashes: HashMap<BlockNumber, Vec<H256>>,
}
impl Default for Extras {
fn default() -> Self {
Extras {
block_hashes: HashMap::new(),
transaction_hashes: HashMap::new(),
}
}
}
impl DatabaseExtras for Extras {
fn block_hash(&self, block_number: BlockNumber) -> Option<H256> {
self.block_hashes.get(&block_number).cloned()
}
fn transaction_hash(&self, block_number: BlockNumber, tx_position: usize) -> Option<H256> {
self.transaction_hashes.get(&block_number)
.and_then(|hashes| hashes.iter().cloned().nth(tx_position))
}
}
fn new_db() -> Arc<KeyValueDB> {
Arc::new(kvdb_memorydb::create(::db::NUM_COLUMNS.unwrap_or(0)))
}
#[test]
fn test_reopening_db_with_tracing_off() {
let db = new_db();
let mut config = Config::default();
// set autotracing
config.enabled = false;
{
let tracedb = TraceDB::new(config.clone(), db.clone(), Arc::new(NoopExtras));
assert_eq!(tracedb.tracing_enabled(), false);
}
}
#[test]
fn test_reopening_db_with_tracing_on() {
let db = new_db();
let mut config = Config::default();
// set tracing on
config.enabled = true;
{
let tracedb = TraceDB::new(config.clone(), db.clone(), Arc::new(NoopExtras));
assert_eq!(tracedb.tracing_enabled(), true);
}
}
fn create_simple_import_request(block_number: BlockNumber, block_hash: H256) -> ImportRequest {
ImportRequest {
traces: FlatBlockTraces::from(vec![FlatTransactionTraces::from(vec![FlatTrace {
trace_address: Default::default(),
subtraces: 0,
action: Action::Call(Call {
from: 1.into(),
to: 2.into(),
value: 3.into(),
gas: 4.into(),
input: vec![],
call_type: CallType::Call,
}),
result: Res::FailedCall(TraceError::OutOfGas),
}])]),
block_hash: block_hash.clone(),
block_number: block_number,
enacted: vec![block_hash],
retracted: 0,
}
}
fn create_noncanon_import_request(block_number: BlockNumber, block_hash: H256) -> ImportRequest {
ImportRequest {
traces: FlatBlockTraces::from(vec![FlatTransactionTraces::from(vec![FlatTrace {
trace_address: Default::default(),
subtraces: 0,
action: Action::Call(Call {
from: 1.into(),
to: 2.into(),
value: 3.into(),
gas: 4.into(),
input: vec![],
call_type: CallType::Call,
}),
result: Res::FailedCall(TraceError::OutOfGas),
}])]),
block_hash: block_hash.clone(),
block_number: block_number,
enacted: vec![],
retracted: 0,
}
}
fn create_simple_localized_trace(block_number: BlockNumber, block_hash: H256, tx_hash: H256) -> LocalizedTrace {
LocalizedTrace {
action: Action::Call(Call {
from: Address::from(1),
to: Address::from(2),
value: U256::from(3),
gas: U256::from(4),
input: vec![],
call_type: CallType::Call,
}),
result: Res::FailedCall(TraceError::OutOfGas),
trace_address: vec![],
subtraces: 0,
transaction_number: Some(0),
transaction_hash: Some(tx_hash),
block_number: block_number,
block_hash: block_hash,
}
}
#[test]
fn test_import_non_canon_traces() {
let db = new_db();
let mut config = Config::default();
config.enabled = true;
let block_0 = H256::from(0xa1);
let block_1 = H256::from(0xa2);
let tx_0 = H256::from(0xff);
let tx_1 = H256::from(0xaf);
let mut extras = Extras::default();
extras.block_hashes.insert(0, block_0.clone());
extras.block_hashes.insert(1, block_1.clone());
extras.transaction_hashes.insert(0, vec![tx_0.clone()]);
extras.transaction_hashes.insert(1, vec![tx_1.clone()]);
let tracedb = TraceDB::new(config, db.clone(), Arc::new(extras));
// import block 0
let request = create_noncanon_import_request(0, block_0.clone());
let mut batch = DBTransaction::new();
tracedb.import(&mut batch, request);
db.write(batch).unwrap();
assert!(tracedb.traces(&block_0).is_some(), "Traces should be available even if block is non-canon.");
}
#[test]
fn test_import() {
let db = new_db();
let mut config = Config::default();
config.enabled = true;
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let block_1 = H256::from(0xa1);
let block_2 = H256::from(0xa2);
let tx_1 = H256::from(0xff);
let tx_2 = H256::from(0xaf);
let mut extras = Extras::default();
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extras.block_hashes.insert(0, H256::default());
extras.block_hashes.insert(1, block_1.clone());
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extras.block_hashes.insert(2, block_2.clone());
extras.transaction_hashes.insert(1, vec![tx_1.clone()]);
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extras.transaction_hashes.insert(2, vec![tx_2.clone()]);
let tracedb = TraceDB::new(config, db.clone(), Arc::new(extras));
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// import block 1
let request = create_simple_import_request(1, block_1.clone());
let mut batch = DBTransaction::new();
tracedb.import(&mut batch, request);
db.write(batch).unwrap();
let filter = Filter {
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range: (1..1),
from_address: AddressesFilter::from(vec![Address::from(1)]),
to_address: AddressesFilter::from(vec![]),
};
let traces = tracedb.filter(&filter);
assert_eq!(traces.len(), 1);
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assert_eq!(traces[0], create_simple_localized_trace(1, block_1.clone(), tx_1.clone()));
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// import block 2
let request = create_simple_import_request(2, block_2.clone());
let mut batch = DBTransaction::new();
tracedb.import(&mut batch, request);
db.write(batch).unwrap();
let filter = Filter {
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range: (1..2),
from_address: AddressesFilter::from(vec![Address::from(1)]),
to_address: AddressesFilter::from(vec![]),
};
let traces = tracedb.filter(&filter);
assert_eq!(traces.len(), 2);
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assert_eq!(traces[0], create_simple_localized_trace(1, block_1.clone(), tx_1.clone()));
assert_eq!(traces[1], create_simple_localized_trace(2, block_2.clone(), tx_2.clone()));
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assert!(tracedb.block_traces(0).is_some(), "Genesis trace should be always present.");
let traces = tracedb.block_traces(1).unwrap();
assert_eq!(traces.len(), 1);
assert_eq!(traces[0], create_simple_localized_trace(1, block_1.clone(), tx_1.clone()));
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let traces = tracedb.block_traces(2).unwrap();
assert_eq!(traces.len(), 1);
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assert_eq!(traces[0], create_simple_localized_trace(2, block_2.clone(), tx_2.clone()));
assert_eq!(None, tracedb.block_traces(3));
let traces = tracedb.transaction_traces(1, 0).unwrap();
assert_eq!(traces.len(), 1);
assert_eq!(traces[0], create_simple_localized_trace(1, block_1.clone(), tx_1.clone()));
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let traces = tracedb.transaction_traces(2, 0).unwrap();
assert_eq!(traces.len(), 1);
assert_eq!(traces[0], create_simple_localized_trace(2, block_2.clone(), tx_2.clone()));
assert_eq!(None, tracedb.transaction_traces(2, 1));
assert_eq!(tracedb.trace(1, 0, vec![]).unwrap(), create_simple_localized_trace(1, block_1.clone(), tx_1.clone()));
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assert_eq!(tracedb.trace(2, 0, vec![]).unwrap(), create_simple_localized_trace(2, block_2.clone(), tx_2.clone()));
}
#[test]
fn query_trace_after_reopen() {
let db = new_db();
let mut config = Config::default();
let mut extras = Extras::default();
let block_0 = H256::from(0xa1);
let tx_0 = H256::from(0xff);
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extras.block_hashes.insert(0, H256::default());
extras.transaction_hashes.insert(0, vec![]);
extras.block_hashes.insert(1, block_0.clone());
extras.transaction_hashes.insert(1, vec![tx_0.clone()]);
// set tracing on
config.enabled = true;
{
let tracedb = TraceDB::new(config.clone(), db.clone(), Arc::new(extras.clone()));
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// import block 1
let request = create_simple_import_request(1, block_0.clone());
let mut batch = DBTransaction::new();
tracedb.import(&mut batch, request);
db.write(batch).unwrap();
}
{
let tracedb = TraceDB::new(config.clone(), db.clone(), Arc::new(extras));
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let traces = tracedb.transaction_traces(1, 0);
assert_eq!(traces.unwrap(), vec![create_simple_localized_trace(1, block_0, tx_0)]);
}
}
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#[test]
fn query_genesis() {
let db = new_db();
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let mut config = Config::default();
let mut extras = Extras::default();
let block_0 = H256::from(0xa1);
extras.block_hashes.insert(0, block_0.clone());
extras.transaction_hashes.insert(0, vec![]);
// set tracing on
config.enabled = true;
let tracedb = TraceDB::new(config.clone(), db.clone(), Arc::new(extras.clone()));
let traces = tracedb.block_traces(0).unwrap();
assert_eq!(traces.len(), 0);
}
}