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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| package api | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
|
|
||
| "go.uber.org/zap" | ||
|
|
||
| "github.com/iotexproject/iotex-core/blockchain/block" | ||
| "github.com/iotexproject/iotex-core/pkg/log" | ||
| ) | ||
|
|
||
| type ( | ||
| // Bin stores []byte | ||
| Bin struct { | ||
| lastUpdate time.Time | ||
| bin map[string][]byte | ||
| } | ||
|
|
||
| // ReadCache stores bins | ||
| ReadCache struct { | ||
| total, hit int | ||
| lock sync.RWMutex | ||
| timeout time.Duration | ||
| bins map[string]*Bin | ||
| } | ||
| ) | ||
|
|
||
| // NewBin returns a new read cache | ||
| func NewBin() *Bin { | ||
| return &Bin{ | ||
| lastUpdate: time.Now(), | ||
| bin: make(map[string][]byte), | ||
| } | ||
| } | ||
|
|
||
| func (b *Bin) expire(timeout time.Duration) bool { | ||
| return b.lastUpdate.Add(timeout).Before(time.Now()) | ||
| } | ||
|
|
||
| func (b *Bin) get(key string) ([]byte, bool) { | ||
| s, ok := b.bin[key] | ||
| return s, ok | ||
| } | ||
|
|
||
| func (b *Bin) put(key string, value []byte) { | ||
| b.bin[key] = value | ||
| b.lastUpdate = time.Now() | ||
| } | ||
|
|
||
| // NewReadCache returns a new read cache | ||
| func NewReadCache(timeout time.Duration) *ReadCache { | ||
| return &ReadCache{ | ||
| timeout: timeout, | ||
| bins: make(map[string]*Bin), | ||
| } | ||
| } | ||
|
|
||
| // Get reads according to key | ||
| func (rc *ReadCache) Get(ns, key string) ([]byte, bool) { | ||
| rc.lock.RLock() | ||
| defer rc.lock.RUnlock() | ||
|
|
||
| rc.total++ | ||
| bin, ok := rc.bins[ns] | ||
| if !ok { | ||
| return nil, false | ||
| } | ||
| d, ok := bin.get(key) | ||
| if ok { | ||
| rc.hit++ | ||
| log.L().Info("API cache hit", zap.Int("total", rc.total), zap.Int("hit", rc.hit)) | ||
| } | ||
| return d, ok | ||
| } | ||
|
|
||
| // Put writes according to key | ||
| func (rc *ReadCache) Put(ns, key string, value []byte) { | ||
| rc.lock.Lock() | ||
| defer rc.lock.Unlock() | ||
|
|
||
| bin, ok := rc.bins[ns] | ||
| if !ok { | ||
| bin = NewBin() | ||
| rc.bins[ns] = bin | ||
| } | ||
| bin.put(key, value) | ||
| } | ||
|
|
||
| // Clear clears the cache | ||
| func (rc *ReadCache) Clear() { | ||
| rc.bins = nil | ||
| rc.bins = make(map[string]*Bin) | ||
| } | ||
|
|
||
| // Respond implements the Responder interface | ||
| func (rc *ReadCache) Respond(*block.Block) error { | ||
| // for now, we just invalidate the entire cache | ||
| rc.Clear() | ||
| return nil | ||
| } | ||
|
|
||
| // Exit implements the Responder interface | ||
| func (rc *ReadCache) Exit() { | ||
| rc.Clear() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| package api | ||
|
|
||
| import ( | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestReadCache(t *testing.T) { | ||
| r := require.New(t) | ||
|
|
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| c := NewReadCache(200 * time.Millisecond) | ||
| rcTests := []struct { | ||
| ns, k string | ||
| v []byte | ||
| }{ | ||
| {"a", "1", []byte{1}}, | ||
| {"a", "2", []byte{2}}, | ||
| {"b", "1", []byte{1}}, | ||
| {"b", "2", []byte{2}}, | ||
| } | ||
| for _, v := range rcTests { | ||
| d, ok := c.Get(v.ns, v.k) | ||
| r.False(ok) | ||
| r.Nil(d) | ||
| c.Put(v.ns, v.k, v.v) | ||
| } | ||
|
|
||
| for _, v := range rcTests { | ||
| d, ok := c.Get(v.ns, v.k) | ||
| r.True(ok) | ||
| r.Equal(v.v, d) | ||
| } | ||
|
|
||
| c.Clear() | ||
| for _, v := range rcTests { | ||
| d, ok := c.Get(v.ns, v.k) | ||
| r.False(ok) | ||
| r.Nil(d) | ||
| c.Put(v.ns, v.k, v.v) | ||
| } | ||
| } |