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authorgary rong <garyrong0905@gmail.com>2018-05-09 16:29:25 +0800
committerPéter Szilágyi <peterke@gmail.com>2018-05-09 16:29:25 +0800
commit4e7dc34ff1a7469b95eb16f5b4084c26a0ab3662 (patch)
treedb18a5c1ae26e2ad0bfa8c9521aee0f2c205ec03 /eth
parent4747aad160ed3721a70a133105c474cb3b66519e (diff)
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eth/filter: check nil pointer when unsubscribe (#16682)
* eth/filter: check nil pointer when unsubscribe * eth/filters, accounts, rpc: abort system if subscribe failed * eth/filter: add crit log before exit * eth/filter, event: minor fixes
Diffstat (limited to 'eth')
-rw-r--r--eth/filters/filter_system.go99
1 files changed, 58 insertions, 41 deletions
diff --git a/eth/filters/filter_system.go b/eth/filters/filter_system.go
index 6d16f572d..bb11734a7 100644
--- a/eth/filters/filter_system.go
+++ b/eth/filters/filter_system.go
@@ -31,6 +31,7 @@ import (
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
+ "github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rpc"
)
@@ -92,8 +93,21 @@ type EventSystem struct {
backend Backend
lightMode bool
lastHead *types.Header
- install chan *subscription // install filter for event notification
- uninstall chan *subscription // remove filter for event notification
+
+ // Subscriptions
+ txSub event.Subscription // Subscription for new transaction event
+ logsSub event.Subscription // Subscription for new log event
+ rmLogsSub event.Subscription // Subscription for removed log event
+ chainSub event.Subscription // Subscription for new chain event
+ pendingLogSub *event.TypeMuxSubscription // Subscription for pending log event
+
+ // Channels
+ install chan *subscription // install filter for event notification
+ uninstall chan *subscription // remove filter for event notification
+ txCh chan core.TxPreEvent // Channel to receive new transaction event
+ logsCh chan []*types.Log // Channel to receive new log event
+ rmLogsCh chan core.RemovedLogsEvent // Channel to receive removed log event
+ chainCh chan core.ChainEvent // Channel to receive new chain event
}
// NewEventSystem creates a new manager that listens for event on the given mux,
@@ -109,10 +123,27 @@ func NewEventSystem(mux *event.TypeMux, backend Backend, lightMode bool) *EventS
lightMode: lightMode,
install: make(chan *subscription),
uninstall: make(chan *subscription),
+ txCh: make(chan core.TxPreEvent, txChanSize),
+ logsCh: make(chan []*types.Log, logsChanSize),
+ rmLogsCh: make(chan core.RemovedLogsEvent, rmLogsChanSize),
+ chainCh: make(chan core.ChainEvent, chainEvChanSize),
}
- go m.eventLoop()
+ // Subscribe events
+ m.txSub = m.backend.SubscribeTxPreEvent(m.txCh)
+ m.logsSub = m.backend.SubscribeLogsEvent(m.logsCh)
+ m.rmLogsSub = m.backend.SubscribeRemovedLogsEvent(m.rmLogsCh)
+ m.chainSub = m.backend.SubscribeChainEvent(m.chainCh)
+ // TODO(rjl493456442): use feed to subscribe pending log event
+ m.pendingLogSub = m.mux.Subscribe(core.PendingLogsEvent{})
+
+ // Make sure none of the subscriptions are empty
+ if m.txSub == nil || m.logsSub == nil || m.rmLogsSub == nil || m.chainSub == nil ||
+ m.pendingLogSub.Closed() {
+ log.Crit("Subscribe for event system failed")
+ }
+ go m.eventLoop()
return m
}
@@ -412,50 +443,35 @@ func (es *EventSystem) lightFilterLogs(header *types.Header, addresses []common.
// eventLoop (un)installs filters and processes mux events.
func (es *EventSystem) eventLoop() {
- var (
- index = make(filterIndex)
- sub = es.mux.Subscribe(core.PendingLogsEvent{})
- // Subscribe TxPreEvent form txpool
- txCh = make(chan core.TxPreEvent, txChanSize)
- txSub = es.backend.SubscribeTxPreEvent(txCh)
- // Subscribe RemovedLogsEvent
- rmLogsCh = make(chan core.RemovedLogsEvent, rmLogsChanSize)
- rmLogsSub = es.backend.SubscribeRemovedLogsEvent(rmLogsCh)
- // Subscribe []*types.Log
- logsCh = make(chan []*types.Log, logsChanSize)
- logsSub = es.backend.SubscribeLogsEvent(logsCh)
- // Subscribe ChainEvent
- chainEvCh = make(chan core.ChainEvent, chainEvChanSize)
- chainEvSub = es.backend.SubscribeChainEvent(chainEvCh)
- )
-
- // Unsubscribe all events
- defer sub.Unsubscribe()
- defer txSub.Unsubscribe()
- defer rmLogsSub.Unsubscribe()
- defer logsSub.Unsubscribe()
- defer chainEvSub.Unsubscribe()
-
+ // Ensure all subscriptions get cleaned up
+ defer func() {
+ es.pendingLogSub.Unsubscribe()
+ es.txSub.Unsubscribe()
+ es.logsSub.Unsubscribe()
+ es.rmLogsSub.Unsubscribe()
+ es.chainSub.Unsubscribe()
+ }()
+
+ index := make(filterIndex)
for i := UnknownSubscription; i < LastIndexSubscription; i++ {
index[i] = make(map[rpc.ID]*subscription)
}
for {
select {
- case ev, active := <-sub.Chan():
- if !active { // system stopped
- return
- }
- es.broadcast(index, ev)
-
// Handle subscribed events
- case ev := <-txCh:
+ case ev := <-es.txCh:
es.broadcast(index, ev)
- case ev := <-rmLogsCh:
+ case ev := <-es.logsCh:
es.broadcast(index, ev)
- case ev := <-logsCh:
+ case ev := <-es.rmLogsCh:
es.broadcast(index, ev)
- case ev := <-chainEvCh:
+ case ev := <-es.chainCh:
+ es.broadcast(index, ev)
+ case ev, active := <-es.pendingLogSub.Chan():
+ if !active { // system stopped
+ return
+ }
es.broadcast(index, ev)
case f := <-es.install:
@@ -467,6 +483,7 @@ func (es *EventSystem) eventLoop() {
index[f.typ][f.id] = f
}
close(f.installed)
+
case f := <-es.uninstall:
if f.typ == MinedAndPendingLogsSubscription {
// the type are logs and pending logs subscriptions
@@ -478,13 +495,13 @@ func (es *EventSystem) eventLoop() {
close(f.err)
// System stopped
- case <-txSub.Err():
+ case <-es.txSub.Err():
return
- case <-rmLogsSub.Err():
+ case <-es.logsSub.Err():
return
- case <-logsSub.Err():
+ case <-es.rmLogsSub.Err():
return
- case <-chainEvSub.Err():
+ case <-es.chainSub.Err():
return
}
}