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miner: one-shot update loop

This commit is contained in:
obscuren 2015-05-21 11:57:00 +02:00
parent 207bd55751
commit 907848997b
1 changed files with 6 additions and 0 deletions
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6
miner/miner.go
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@ -39,6 +39,10 @@ func New(eth core.Backend, mux *event.TypeMux, pow pow.PoW) *Miner {
return miner return miner
} }
// update keeps track of the downloader events. Please be aware that this is a one shot type of update loop.
// It's entered once and as soon as `Done` or `Failed` has been broadcasted the events are unregistered and
// the loop is exited. This to prevent a major security vuln where external parties can DOS you with blocks
// and halt your mining operation for as long as the DOS continues.
func (self *Miner) update() { func (self *Miner) update() {
events := self.mux.Subscribe(downloader.StartEvent{}, downloader.DoneEvent{}, downloader.FailedEvent{}) events := self.mux.Subscribe(downloader.StartEvent{}, downloader.DoneEvent{}, downloader.FailedEvent{})
for ev := range events.Chan() { for ev := range events.Chan() {
@ -59,6 +63,8 @@ func (self *Miner) update() {
self.Start(self.coinbase, self.threads) self.Start(self.coinbase, self.threads)
} }
} }
// unsubscribe. we're only interested in this event once
events.Unsubscribe()
} }
} }