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107 lines
2.4 KiB
107 lines
2.4 KiB
package mempool
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import (
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"container/list"
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"sync"
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"github.com/tendermint/tendermint/types"
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)
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// TxCache defines an interface for raw transaction caching in a mempool.
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// Currently, a TxCache does not allow direct reading or getting of transaction
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// values. A TxCache is used primarily to push transactions and removing
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// transactions. Pushing via Push returns a boolean telling the caller if the
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// transaction already exists in the cache or not.
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type TxCache interface {
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// Reset resets the cache to an empty state.
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Reset()
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// Push adds the given raw transaction to the cache and returns true if it was
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// newly added. Otherwise, it returns false.
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Push(tx types.Tx) bool
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// Remove removes the given raw transaction from the cache.
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Remove(tx types.Tx)
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}
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var _ TxCache = (*LRUTxCache)(nil)
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// LRUTxCache maintains a thread-safe LRU cache of raw transactions. The cache
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// only stores the hash of the raw transaction.
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type LRUTxCache struct {
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mtx sync.Mutex
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size int
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cacheMap map[types.TxKey]*list.Element
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list *list.List
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}
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func NewLRUTxCache(cacheSize int) *LRUTxCache {
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return &LRUTxCache{
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size: cacheSize,
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cacheMap: make(map[types.TxKey]*list.Element, cacheSize),
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list: list.New(),
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}
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}
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// GetList returns the underlying linked-list that backs the LRU cache. Note,
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// this should be used for testing purposes only!
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func (c *LRUTxCache) GetList() *list.List {
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return c.list
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}
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func (c *LRUTxCache) Reset() {
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c.mtx.Lock()
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defer c.mtx.Unlock()
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c.cacheMap = make(map[types.TxKey]*list.Element, c.size)
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c.list.Init()
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}
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func (c *LRUTxCache) Push(tx types.Tx) bool {
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c.mtx.Lock()
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defer c.mtx.Unlock()
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key := tx.Key()
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moved, ok := c.cacheMap[key]
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if ok {
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c.list.MoveToBack(moved)
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return false
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}
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if c.list.Len() >= c.size {
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front := c.list.Front()
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if front != nil {
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frontKey := front.Value.(types.TxKey)
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delete(c.cacheMap, frontKey)
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c.list.Remove(front)
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}
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}
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e := c.list.PushBack(key)
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c.cacheMap[key] = e
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return true
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}
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func (c *LRUTxCache) Remove(tx types.Tx) {
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c.mtx.Lock()
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defer c.mtx.Unlock()
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key := tx.Key()
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e := c.cacheMap[key]
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delete(c.cacheMap, key)
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if e != nil {
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c.list.Remove(e)
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}
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}
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// NopTxCache defines a no-op raw transaction cache.
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type NopTxCache struct{}
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var _ TxCache = (*NopTxCache)(nil)
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func (NopTxCache) Reset() {}
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func (NopTxCache) Push(types.Tx) bool { return true }
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func (NopTxCache) Remove(types.Tx) {}
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