94 lines
1.8 KiB
Go
94 lines
1.8 KiB
Go
package mapblockaccessor
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import (
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"mapserver/coords"
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"mapserver/eventbus"
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"mapserver/mapblockparser"
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"sync"
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cache "github.com/patrickmn/go-cache"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/sirupsen/logrus"
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)
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var lock = &sync.RWMutex{}
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func (a *MapBlockAccessor) GetMapBlock(pos *coords.MapBlockCoords) (*mapblockparser.MapBlock, error) {
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key := getKey(pos)
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//maintenance
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cacheBlocks.Set(float64(a.blockcache.ItemCount()))
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if a.blockcache.ItemCount() > a.maxcount {
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//flush cache
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fields := logrus.Fields{
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"cached items": a.blockcache.ItemCount(),
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"maxcount": a.maxcount,
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}
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logrus.WithFields(fields).Debug("Flushing cache")
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a.blockcache.Flush()
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}
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//read section
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lock.RLock()
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cachedblock, found := a.blockcache.Get(key)
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if found {
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defer lock.RUnlock()
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getCacheHitCount.Inc()
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if cachedblock == nil {
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return nil, nil
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} else {
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return cachedblock.(*mapblockparser.MapBlock), nil
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}
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}
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//end read
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lock.RUnlock()
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timer := prometheus.NewTimer(dbGetDuration)
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defer timer.ObserveDuration()
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//write section
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lock.Lock()
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defer lock.Unlock()
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//try read
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cachedblock, found = a.blockcache.Get(key)
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if found {
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getCacheHitCount.Inc()
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if cachedblock == nil {
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return nil, nil
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} else {
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return cachedblock.(*mapblockparser.MapBlock), nil
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}
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}
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block, err := a.accessor.GetBlock(pos)
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if err != nil {
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return nil, err
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}
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if block == nil {
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//no mapblock here
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cacheBlockCount.Inc()
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a.blockcache.Set(key, nil, cache.DefaultExpiration)
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return nil, nil
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}
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getCacheMissCount.Inc()
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mapblock, err := mapblockparser.Parse(block.Data, block.Mtime, pos)
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if err != nil {
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return nil, err
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}
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a.Eventbus.Emit(eventbus.MAPBLOCK_RENDERED, mapblock)
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cacheBlockCount.Inc()
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a.blockcache.Set(key, mapblock, cache.DefaultExpiration)
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return mapblock, nil
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}
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