缓存写入结束时检查Content-Length是否和实际内容长度一致

internal/caches/errors.go

@@ -6,13 +6,14 @@ import "errors"
 
 // 常用的几个错误
 var (
-	ErrNotFound           = errors.New("cache not found")
+	ErrNotFound                = errors.New("cache not found")
-	ErrFileIsWriting      = errors.New("the cache file is updating")
+	ErrFileIsWriting           = errors.New("the cache file is updating")
-	ErrInvalidRange       = errors.New("invalid range")
+	ErrInvalidRange            = errors.New("invalid range")
-	ErrEntityTooLarge     = errors.New("entity too large")
+	ErrEntityTooLarge          = errors.New("entity too large")
-	ErrWritingUnavailable = errors.New("writing unavailable")
+	ErrWritingUnavailable      = errors.New("writing unavailable")
-	ErrWritingQueueFull   = errors.New("writing queue full")
+	ErrWritingQueueFull        = errors.New("writing queue full")
-	ErrServerIsBusy       = errors.New("server is busy")
+	ErrServerIsBusy            = errors.New("server is busy")
+	ErrUnexpectedContentLength = errors.New("unexpected content length")
 )
 
 // CapacityError 容量错误

internal/caches/writer_file.go

@@ -136,6 +136,13 @@ func (this *FileWriter) Close() error {
 
 	var path = this.rawWriter.Name()
 
+	// check content length
+	if this.metaBodySize > 0 && this.bodySize != this.metaBodySize {
+		_ = this.rawWriter.Close()
+		_ = os.Remove(path)
+		return ErrUnexpectedContentLength
+	}
+
 	err := this.WriteHeaderLength(types.Int(this.headerSize))
 	if err != nil {
 		fsutils.WriteBegin()

internal/caches/writer_memory.go

@@ -121,6 +121,14 @@ func (this *MemoryWriter) Close() error {
 		return nil
 	}
 
+	// check content length
+	if this.expectedBodySize > 0 && this.bodySize != this.expectedBodySize {
+		this.storage.locker.Lock()
+		delete(this.storage.valuesMap, this.hash)
+		this.storage.locker.Unlock()
+		return ErrUnexpectedContentLength
+	}
+
 	this.storage.locker.Lock()
 	this.item.IsDone = true
 	var err error
@@ -129,7 +137,7 @@ func (this *MemoryWriter) Close() error {
 			this.storage.valuesMap[this.hash] = this.item
 
 			select {
-			case this.storage.dirtyChan <- types.String(this.bodySize) + "@" +this.key  :
+			case this.storage.dirtyChan <- types.String(this.bodySize) + "@" + this.key:
 				atomic.AddInt64(&this.storage.totalDirtySize, this.bodySize)
 			default:
 				// remove from values map
@@ -158,7 +166,6 @@ func (this *MemoryWriter) Discard() error {
 
 	this.storage.locker.Lock()
 	delete(this.storage.valuesMap, this.hash)
-
 	this.storage.locker.Unlock()
 	return nil
 }