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eth/downloader: fix test panic (#35215)

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This PR addresses the panic in tests. As the eventLoop is spun up when
the downloader was closed, the sub will be nil and make the panic
happens.

```
  goroutine 421 [running]:
  github.com/ethereum/go-ethereum/eth/downloader.(*DownloaderAPI).eventLoop(0xcb0e4d0)
      /opt/actions-runner/_work/go-ethereum/go-ethereum/eth/downloader/api.go:91 +0x127
  created by github.com/ethereum/go-ethereum/eth/downloader.NewDownloaderAPI in goroutine 352
      /opt/actions-runner/_work/go-ethereum/go-ethereum/eth/downloader/api.go:50 +0xf2
```
This commit is contained in:
rjl493456442 2026-06-25 19:10:54 +08:00 committed by GitHub
parent 38678ec516
commit a63e2f1247
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1 changed files with 5 additions and 2 deletions
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7
eth/downloader/api.go
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@ -62,9 +62,12 @@ func NewDownloaderAPI(d *Downloader, chain *core.BlockChain) *DownloaderAPI {
// If the node is already synced up, then only a single event subscribers will
// receive is {false}.
func (api *DownloaderAPI) eventLoop() {
events := make(chan SyncEvent, 16)
sub := api.d.SubscribeSyncEvents(events)
if sub == nil {
return
}
var (
events = make(chan SyncEvent, 16)
sub = api.d.SubscribeSyncEvents(events)
syncSubscriptions = make(map[chan interface{}]struct{})
checkInterval = time.Second * 60
checkTimer = time.NewTimer(checkInterval)