缓存文件实现Sendfile

internal/nodes/http_request_cache.go

@@ -540,7 +540,15 @@ func (this *HTTPRequest) doCacheRead(useStale bool) (shouldStop bool) {
 			this.writer.Prepare(resp, fileSize, reader.Status(), false)
 			this.writer.WriteHeader(reader.Status())
 
-			_, err = io.CopyBuffer(this.writer, resp.Body, buf)
+			if storage.CanSendfile() {
+				if fp, canSendFile := this.writer.canSendfile(); canSendFile {
+					this.writer.sentBodyBytes, err = io.CopyBuffer(this.writer.rawWriter, fp, buf)
+				} else {
+					_, err = io.CopyBuffer(this.writer, resp.Body, buf)
+				}
+			} else {
+				_, err = io.CopyBuffer(this.writer, resp.Body, buf)
+			}
 			if err == io.EOF {
 				err = nil
 			}

internal/nodes/http_writer.go

@@ -1058,7 +1058,9 @@ func (this *HTTPWriter) Close() {
 		}
 	}
 
-	this.sentBodyBytes = this.counterWriter.TotalBytes()
+	if this.sentBodyBytes == 0 {
+		this.sentBodyBytes = this.counterWriter.TotalBytes()
+	}
 }
 
 // Hijack Hijack

internal/nodes/http_writer_ext.go

@@ -0,0 +1,9 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+//go:build !plus
+// +build !plus
+
+package nodes
+
+func (this *HTTPWriter) canSendfile() (*os.File, bool) {
+	return nil, false
+}