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fix: resolve data race in storagev2 cacheProvider #173

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fix: resolve data race in storagev2 cacheProvider #173

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21 changes: 15 additions & 6 deletions storagev2/resolver/resolver.go
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Original file line number Diff line number Diff line change
Expand Up @@ -261,16 +261,25 @@ func (resolver cacheResolver) FeedbackGood(ctx context.Context, host string, ips
rcv := cacheValue.(*resolverCacheValue)
now := time.Now()
anyIPLiveLonger := false
for i := range rcv.IPs {
if isIPContains(ips, rcv.IPs[i].IP) {
rcv.IPs[i].ExpiredAt = now.Add(resolver.cacheLifetime)

// Create a copy of the cache value to avoid race conditions
newRcv := &resolverCacheValue{
IPs: make([]resolverCacheValueIP, len(rcv.IPs)),
RefreshAfter: rcv.RefreshAfter,
ExpiredAt: rcv.ExpiredAt,
}
copy(newRcv.IPs, rcv.IPs)

for i := range newRcv.IPs {
if isIPContains(ips, newRcv.IPs[i].IP) {
newRcv.IPs[i].ExpiredAt = now.Add(resolver.cacheLifetime)
anyIPLiveLonger = true
}
}
if anyIPLiveLonger {
rcv.RefreshAfter = now.Add(resolver.cacheRefreshAfter)
rcv.ExpiredAt = now.Add(resolver.cacheLifetime)
resolver.cache.Set(cacheKey, rcv)
newRcv.RefreshAfter = now.Add(resolver.cacheRefreshAfter)
newRcv.ExpiredAt = now.Add(resolver.cacheLifetime)
resolver.cache.Set(cacheKey, newRcv)
}
}
}
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