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feat: add timeout support to filestore
resolve #11
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| package filestore | ||
|
|
||
| import ( | ||
| "container/heap" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/criyle/go-judge/envexec" | ||
| ) | ||
|
|
||
| var ( | ||
| _ FileStore = &Timeout{} | ||
| _ heap.Interface = &Timeout{} | ||
| ) | ||
|
|
||
| // Timeout is a file system with a maximun TTL | ||
| type Timeout struct { | ||
| mu sync.Mutex | ||
| FileStore | ||
| timeout time.Duration | ||
| files []timeoutFile | ||
| idToIndex map[string]int | ||
| } | ||
|
|
||
| type timeoutFile struct { | ||
| id string | ||
| time time.Time | ||
| } | ||
|
|
||
| // NewTimeout creates a timeout file system with maximun TTL for a file | ||
| func NewTimeout(fs FileStore, timeout time.Duration, checkInterval time.Duration) FileStore { | ||
| t := &Timeout{ | ||
| FileStore: fs, | ||
| timeout: timeout, | ||
| files: make([]timeoutFile, 0), | ||
| idToIndex: make(map[string]int), | ||
| } | ||
| go t.checkTimeoutLoop(checkInterval) | ||
| return t | ||
| } | ||
|
|
||
| func (t *Timeout) checkTimeoutLoop(interval time.Duration) { | ||
| ticker := time.NewTicker(interval) | ||
| for { | ||
| t.checkTimeoutAndRemove() | ||
| <-ticker.C | ||
| } | ||
| } | ||
|
|
||
| func (t *Timeout) checkTimeoutAndRemove() { | ||
| t.mu.Lock() | ||
| defer t.mu.Unlock() | ||
|
|
||
| now := time.Now() | ||
| for len(t.files) > 0 && t.files[0].time.Add(t.timeout).Before(now) { | ||
| f := t.files[0] | ||
| t.FileStore.Remove(f.id) | ||
| heap.Pop(t) | ||
| } | ||
| } | ||
|
|
||
| func (t *Timeout) Len() int { | ||
| return len(t.files) | ||
| } | ||
|
|
||
| func (t *Timeout) Less(i, j int) bool { | ||
| return t.files[i].time.Before(t.files[j].time) | ||
| } | ||
|
|
||
| func (t *Timeout) Swap(i, j int) { | ||
| t.files[i], t.files[j] = t.files[j], t.files[i] | ||
| t.idToIndex[t.files[i].id] = i | ||
| t.idToIndex[t.files[j].id] = j | ||
| } | ||
|
|
||
| func (t *Timeout) Push(x interface{}) { | ||
| e := x.(timeoutFile) | ||
| t.files = append(t.files, e) | ||
| t.idToIndex[e.id] = len(t.files) - 1 | ||
| } | ||
|
|
||
| func (t *Timeout) Pop() interface{} { | ||
| e := t.files[len(t.files)-1] | ||
| t.files = t.files[:len(t.files)-1] | ||
| delete(t.idToIndex, e.id) | ||
| return e | ||
| } | ||
|
|
||
| func (t *Timeout) Add(name string, content []byte) (string, error) { | ||
| // try add to file store underlying | ||
| id, err := t.FileStore.Add(name, content) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| t.mu.Lock() | ||
| defer t.mu.Unlock() | ||
|
|
||
| f := timeoutFile{id, time.Now()} | ||
| heap.Push(t, f) | ||
|
|
||
| return id, nil | ||
| } | ||
|
|
||
| func (t *Timeout) Remove(id string) bool { | ||
| success := t.FileStore.Remove(id) | ||
|
|
||
| t.mu.Lock() | ||
| defer t.mu.Unlock() | ||
|
|
||
| index, ok := t.idToIndex[id] | ||
| if !ok { | ||
| return success | ||
| } | ||
| heap.Remove(t, index) | ||
| return success | ||
| } | ||
|
|
||
| func (t *Timeout) Get(id string) (string, envexec.File) { | ||
| name, file := t.FileStore.Get(id) | ||
|
|
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| t.mu.Lock() | ||
| defer t.mu.Unlock() | ||
|
|
||
| index, ok := t.idToIndex[id] | ||
| if !ok { | ||
| return name, file | ||
| } | ||
| t.files[index].time = time.Now() | ||
| heap.Fix(t, index) | ||
|
|
||
| return name, file | ||
| } |
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