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backend: Stream-isolate LRU cache

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Fixes https://github.com/namecoin/ncdns/issues/112
This commit is contained in:
JeremyRand 2019-10-18 10:10:36 +00:00
parent ed8fa682eb
commit 06d6efba8c
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GPG Key ID: B3F2D165786D6570
1 changed files with 24 additions and 15 deletions
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39
backend/backend.go
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@ -18,14 +18,13 @@ import "time"
// Provides an abstract zone file for the Namecoin .bit TLD.
type Backend struct {
//s *Server
nc namecoin.Conn
cache lru.Cache // items are of type *Domain
nc namecoin.Conn
// caches map keys are stream isolation ID's; items are of type *Domain
caches map[string]*lru.Cache
cacheMutex sync.Mutex
cfg Config
}
const defaultMaxEntries = 100
var log, Log = xlog.New("ncdns.backend")
// Backend configuration.
@ -35,7 +34,7 @@ type Config struct {
// Timeout (in milliseconds) for Namecoin RPC requests
NamecoinTimeout int
// Maximum entries to permit in name cache. If zero, a default value is used.
// Maximum entries to permit in name cache.
CacheMaxEntries int
// Nameservers to advertise at zone apex. The first is considered the primary.
@ -68,10 +67,7 @@ func New(cfg *Config) (backend *Backend, err error) {
//b.nc.Password = cfg.RPCPassword
//b.nc.Server = cfg.RPCAddress
b.cache.MaxEntries = cfg.CacheMaxEntries
if b.cache.MaxEntries == 0 {
b.cache.MaxEntries = defaultMaxEntries
}
b.caches = make(map[string]*lru.Cache)
hostmaster, err := convertEmail(b.cfg.Hostmaster)
if err != nil {
@ -291,7 +287,7 @@ type domain struct {
}
func (b *Backend) getNamecoinEntry(name, streamIsolationID string) (*domain, error) {
d := b.getNamecoinEntryCache(name)
d := b.getNamecoinEntryCache(name, streamIsolationID)
if d != nil {
return d, nil
}
@ -301,15 +297,20 @@ func (b *Backend) getNamecoinEntry(name, streamIsolationID string) (*domain, err
return nil, err
}
b.addNamecoinEntryToCache(name, d)
b.addNamecoinEntryToCache(name, d, streamIsolationID)
return d, nil
}
func (b *Backend) getNamecoinEntryCache(name string) *domain {
func (b *Backend) getNamecoinEntryCache(name, streamIsolationID string) *domain {
b.cacheMutex.Lock()
defer b.cacheMutex.Unlock()
if dd, ok := b.cache.Get(name); ok {
cache, ok := b.caches[streamIsolationID]
if !ok {
return nil
}
if dd, ok := cache.Get(name); ok {
d := dd.(*domain)
return d
}
@ -317,11 +318,19 @@ func (b *Backend) getNamecoinEntryCache(name string) *domain {
return nil
}
func (b *Backend) addNamecoinEntryToCache(name string, d *domain) {
func (b *Backend) addNamecoinEntryToCache(name string, d *domain, streamIsolationID string) {
b.cacheMutex.Lock()
defer b.cacheMutex.Unlock()
b.cache.Add(name, d)
cache, ok := b.caches[streamIsolationID]
if !ok {
b.caches[streamIsolationID] = &lru.Cache{
MaxEntries: b.cfg.CacheMaxEntries,
}
cache = b.caches[streamIsolationID]
}
cache.Add(name, d)
}
func (b *Backend) getNamecoinEntryLL(name, streamIsolationID string) (*domain, error) {