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Merge pull request #877 from tendermint/p2p-switch-DialSeeds-undeterministically

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p2p: make Switch.DialSeeds use a new PRNG per call
This commit is contained in:
Ethan Buchman
2017-11-21 15:24:29 +00:00
committed by GitHub
parent f9bc22ec6a 031e10133c
commit 75463b8331
1 changed files with 6 additions and 3 deletions
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9
p2p/switch.go
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@@ -295,7 +295,6 @@ func (sw *Switch) startInitPeer(peer *peer) {
// DialSeeds dials a list of seeds asynchronously in random order.
func (sw *Switch) DialSeeds(addrBook *AddrBook, seeds []string) error {
netAddrs, err := NewNetAddressStrings(seeds)
if err != nil {
return err
@@ -315,11 +314,15 @@ func (sw *Switch) DialSeeds(addrBook *AddrBook, seeds []string) error {
addrBook.Save()
}
// Ensure we have a completely undeterministic PRNG. cmd.RandInt64() draws
// from a seed that's initialized with OS entropy on process start.
rng := rand.New(rand.NewSource(cmn.RandInt64()))
// permute the list, dial them in random order.
perm := rand.Perm(len(netAddrs))
perm := rng.Perm(len(netAddrs))
for i := 0; i < len(perm); i++ {
go func(i int) {
time.Sleep(time.Duration(rand.Int63n(3000)) * time.Millisecond)
time.Sleep(time.Duration(rng.Int63n(3000)) * time.Millisecond)
j := perm[i]
sw.dialSeed(netAddrs[j])
}(i)