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eth: fix #2710 filter races

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and locking bugs found in its wake.
This commit is contained in:
Henning Diedrich 2016-06-17 09:53:54 +02:00
parent 4f3f6e28d5
commit 51f8ce26cf
2 changed files with 54 additions and 28 deletions
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63
eth/filters/api.go
View File

@ -68,8 +68,6 @@ type PublicFilterAPI struct {
transactionMu sync.RWMutex
transactionQueue map[int]*hashQueue
transactMu sync.Mutex
}
// NewPublicFilterAPI returns a new PublicFilterAPI instance.
@ -100,6 +98,7 @@ done:
for {
select {
case <-timer.C:
s.filterManager.Lock() // lock order like filterLoop()
s.logMu.Lock()
for id, filter := range s.logQueue {
if time.Since(filter.timeout) > filterTickerTime {
@ -126,6 +125,7 @@ done:
}
}
s.transactionMu.Unlock()
s.filterManager.Unlock()
case <-s.quit:
break done
}
@ -135,19 +135,24 @@ done:
// NewBlockFilter create a new filter that returns blocks that are included into the canonical chain.
func (s *PublicFilterAPI) NewBlockFilter() (string, error) {
// protect filterManager.Add() and setting of filter fields
s.filterManager.Lock()
defer s.filterManager.Unlock()
externalId, err := newFilterId()
if err != nil {
return "", err
}
s.blockMu.Lock()
filter := New(s.chainDb)
id, err := s.filterManager.Add(filter, ChainFilter)
if err != nil {
return "", err
}
s.blockMu.Lock()
s.blockQueue[id] = &hashQueue{timeout: time.Now()}
s.blockMu.Unlock()
filter.BlockCallback = func(block *types.Block, logs vm.Logs) {
s.blockMu.Lock()
@ -158,8 +163,6 @@ func (s *PublicFilterAPI) NewBlockFilter() (string, error) {
}
}
defer s.blockMu.Unlock()
s.filterMapMu.Lock()
s.filterMapping[externalId] = id
s.filterMapMu.Unlock()
@ -169,21 +172,24 @@ func (s *PublicFilterAPI) NewBlockFilter() (string, error) {
// NewPendingTransactionFilter creates a filter that returns new pending transactions.
func (s *PublicFilterAPI) NewPendingTransactionFilter() (string, error) {
// protect filterManager.Add() and setting of filter fields
s.filterManager.Lock()
defer s.filterManager.Unlock()
externalId, err := newFilterId()
if err != nil {
return "", err
}
s.transactionMu.Lock()
defer s.transactionMu.Unlock()
filter := New(s.chainDb)
id, err := s.filterManager.Add(filter, PendingTxFilter)
if err != nil {
return "", err
}
s.transactionMu.Lock()
s.transactionQueue[id] = &hashQueue{timeout: time.Now()}
s.transactionMu.Unlock()
filter.TransactionCallback = func(tx *types.Transaction) {
s.transactionMu.Lock()
@ -203,8 +209,9 @@ func (s *PublicFilterAPI) NewPendingTransactionFilter() (string, error) {
// newLogFilter creates a new log filter.
func (s *PublicFilterAPI) newLogFilter(earliest, latest int64, addresses []common.Address, topics [][]common.Hash, callback func(log *vm.Log, removed bool)) (int, error) {
s.logMu.Lock()
defer s.logMu.Unlock()
// protect filterManager.Add() and setting of filter fields
s.filterManager.Lock()
defer s.filterManager.Unlock()
filter := New(s.chainDb)
id, err := s.filterManager.Add(filter, LogFilter)
@ -212,7 +219,9 @@ func (s *PublicFilterAPI) newLogFilter(earliest, latest int64, addresses []commo
return 0, err
}
s.logMu.Lock()
s.logQueue[id] = &logQueue{timeout: time.Now()}
s.logMu.Unlock()
filter.SetBeginBlock(earliest)
filter.SetEndBlock(latest)
@ -443,35 +452,43 @@ func (s *PublicFilterAPI) GetLogs(args NewFilterArgs) []vmlog {
// UninstallFilter removes the filter with the given filter id.
func (s *PublicFilterAPI) UninstallFilter(filterId string) bool {
s.filterMapMu.Lock()
defer s.filterMapMu.Unlock()
s.filterManager.Lock()
defer s.filterManager.Unlock()
s.filterMapMu.Lock()
id, ok := s.filterMapping[filterId]
if !ok {
s.filterMapMu.Unlock()
return false
}
defer s.filterManager.Remove(id)
delete(s.filterMapping, filterId)
s.filterMapMu.Unlock()
s.filterManager.Remove(id)
if _, ok := s.logQueue[id]; ok {
s.logMu.Lock()
defer s.logMu.Unlock()
if _, ok := s.logQueue[id]; ok {
delete(s.logQueue, id)
s.logMu.Unlock()
return true
}
if _, ok := s.blockQueue[id]; ok {
s.logMu.Unlock()
s.blockMu.Lock()
defer s.blockMu.Unlock()
if _, ok := s.blockQueue[id]; ok {
delete(s.blockQueue, id)
s.blockMu.Unlock()
return true
}
if _, ok := s.transactionQueue[id]; ok {
s.blockMu.Unlock()
s.transactionMu.Lock()
defer s.transactionMu.Unlock()
if _, ok := s.transactionQueue[id]; ok {
delete(s.transactionQueue, id)
s.transactionMu.Unlock()
return true
}
s.transactionMu.Unlock()
return false
}
@ -525,7 +542,9 @@ func (s *PublicFilterAPI) logFilterChanged(id int) []vmlog {
// GetFilterLogs returns the logs for the filter with the given id.
func (s *PublicFilterAPI) GetFilterLogs(filterId string) []vmlog {
s.filterMapMu.RLock()
id, ok := s.filterMapping[filterId]
s.filterMapMu.RUnlock()
if !ok {
return toRPCLogs(nil, false)
}
@ -540,9 +559,9 @@ func (s *PublicFilterAPI) GetFilterLogs(filterId string) []vmlog {
// GetFilterChanges returns the logs for the filter with the given id since last time is was called.
// This can be used for polling.
func (s *PublicFilterAPI) GetFilterChanges(filterId string) interface{} {
s.filterMapMu.Lock()
s.filterMapMu.RLock()
id, ok := s.filterMapping[filterId]
s.filterMapMu.Unlock()
s.filterMapMu.RUnlock()
if !ok { // filter not found
return []interface{}{}

19
eth/filters/filter_system.go
View File

@ -82,11 +82,20 @@ func (fs *FilterSystem) Stop() {
fs.sub.Unsubscribe()
}
// Add adds a filter to the filter manager
func (fs *FilterSystem) Add(filter *Filter, filterType FilterType) (int, error) {
// Acquire filter system maps lock, required to force lock acquisition
// sequence with filterMu acquired first to avoid deadlocks by callbacks
func (fs *FilterSystem) Lock() {
fs.filterMu.Lock()
defer fs.filterMu.Unlock()
}
// Release filter system maps lock
func (fs *FilterSystem) Unlock() {
fs.filterMu.Unlock()
}
// Add adds a filter to the filter manager
// Expects filterMu to be locked.
func (fs *FilterSystem) Add(filter *Filter, filterType FilterType) (int, error) {
id := fs.filterId
filter.created = time.Now()
@ -110,10 +119,8 @@ func (fs *FilterSystem) Add(filter *Filter, filterType FilterType) (int, error)
}
// Remove removes a filter by filter id
// Expects filterMu to be locked.
func (fs *FilterSystem) Remove(id int) {
fs.filterMu.Lock()
defer fs.filterMu.Unlock()
delete(fs.chainFilters, id)
delete(fs.pendingTxFilters, id)
delete(fs.logFilters, id)