Move memory_map_windows to new folder, intercept most of the read and write calls to volume dat files

weed/storage/needle/needle_read_write.go

@@ -11,6 +11,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/joeslay/seaweedfs/weed/storage/memory_map"
 )
 
 const (
@@ -29,39 +30,25 @@ func (n *Needle) DiskSize(version Version) int64 {
 	return GetActualSize(n.Size, version)
 }
 
-func (n *Needle) Append(w *os.File, version Version) (offset uint64, size uint32, actualSize int64, err error) {
-	if end, e := w.Seek(0, io.SeekEnd); e == nil {
-		defer func(w *os.File, off int64) {
-			if err != nil {
-				if te := w.Truncate(end); te != nil {
-					glog.V(0).Infof("Failed to truncate %s back to %d with error: %v", w.Name(), end, te)
-				}
-			}
-		}(w, end)
-		offset = uint64(end)
-	} else {
-		err = fmt.Errorf("Cannot Read Current Volume Position: %v", e)
-		return
-	}
+func (n *Needle) prepareWriteBuffer(version Version) ([]byte, uint32, int64, error) {
+
+	writeBytes := make([]byte, 0)
+
 	switch version {
 	case Version1:
 		header := make([]byte, NeedleHeaderSize)
 		CookieToBytes(header[0:CookieSize], n.Cookie)
 		NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
 		n.Size = uint32(len(n.Data))
-		size = n.Size
 		util.Uint32toBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
-		if _, err = w.Write(header); err != nil {
-			return
-		}
-		if _, err = w.Write(n.Data); err != nil {
-			return
-		}
-		actualSize = NeedleHeaderSize + int64(n.Size)
+		size := n.Size
+		actualSize := NeedleHeaderSize + int64(n.Size)
+		writeBytes = append(writeBytes, header...)
+		writeBytes = append(writeBytes, n.Data...)
 		padding := PaddingLength(n.Size, version)
 		util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value())
-		_, err = w.Write(header[0 : NeedleChecksumSize+padding])
-		return
+		writeBytes = append(writeBytes, header[0:NeedleChecksumSize+padding]...)
+		return writeBytes, size, actualSize, nil
 	case Version2, Version3:
 		header := make([]byte, NeedleHeaderSize+TimestampSize) // adding timestamp to reuse it and avoid extra allocation
 		CookieToBytes(header[0:CookieSize], n.Cookie)
@@ -92,82 +79,103 @@ func (n *Needle) Append(w *os.File, version Version) (offset uint64, size uint32
 		} else {
 			n.Size = 0
 		}
-		size = n.DataSize
 		util.Uint32toBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
-		if _, err = w.Write(header[0:NeedleHeaderSize]); err != nil {
-			return
-		}
+		writeBytes = append(writeBytes, header[0:NeedleHeaderSize]...)
 		if n.DataSize > 0 {
 			util.Uint32toBytes(header[0:4], n.DataSize)
-			if _, err = w.Write(header[0:4]); err != nil {
-				return
-			}
-			if _, err = w.Write(n.Data); err != nil {
-				return
-			}
+			writeBytes = append(writeBytes, header[0:4]...)
+			writeBytes = append(writeBytes, n.Data...)
 			util.Uint8toBytes(header[0:1], n.Flags)
-			if _, err = w.Write(header[0:1]); err != nil {
-				return
-			}
+			writeBytes = append(writeBytes, header[0:1]...)
 			if n.HasName() {
 				util.Uint8toBytes(header[0:1], n.NameSize)
-				if _, err = w.Write(header[0:1]); err != nil {
-					return
-				}
-				if _, err = w.Write(n.Name[:n.NameSize]); err != nil {
-					return
-				}
+				writeBytes = append(writeBytes, header[0:1]...)
+				writeBytes = append(writeBytes, n.Name[:n.NameSize]...)
 			}
 			if n.HasMime() {
 				util.Uint8toBytes(header[0:1], n.MimeSize)
-				if _, err = w.Write(header[0:1]); err != nil {
-					return
-				}
-				if _, err = w.Write(n.Mime); err != nil {
-					return
-				}
+				writeBytes = append(writeBytes, header[0:1]...)
+				writeBytes = append(writeBytes, n.Mime...)
 			}
 			if n.HasLastModifiedDate() {
 				util.Uint64toBytes(header[0:8], n.LastModified)
-				if _, err = w.Write(header[8-LastModifiedBytesLength : 8]); err != nil {
-					return
-				}
+				writeBytes = append(writeBytes, header[8-LastModifiedBytesLength:8]...)
 			}
 			if n.HasTtl() && n.Ttl != nil {
 				n.Ttl.ToBytes(header[0:TtlBytesLength])
-				if _, err = w.Write(header[0:TtlBytesLength]); err != nil {
-					return
-				}
+				writeBytes = append(writeBytes, header[0:TtlBytesLength]...)
 			}
 			if n.HasPairs() {
 				util.Uint16toBytes(header[0:2], n.PairsSize)
-				if _, err = w.Write(header[0:2]); err != nil {
-					return
-				}
-				if _, err = w.Write(n.Pairs); err != nil {
-					return
-				}
+				writeBytes = append(writeBytes, header[0:2]...)
+				writeBytes = append(writeBytes, n.Pairs...)
 			}
 		}
 		padding := PaddingLength(n.Size, version)
 		util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value())
 		if version == Version2 {
-			_, err = w.Write(header[0 : NeedleChecksumSize+padding])
+			writeBytes = append(writeBytes, header[0:NeedleChecksumSize+padding]...)
 		} else {
 			// version3
 			util.Uint64toBytes(header[NeedleChecksumSize:NeedleChecksumSize+TimestampSize], n.AppendAtNs)
-			_, err = w.Write(header[0 : NeedleChecksumSize+TimestampSize+padding])
+			writeBytes = append(writeBytes, header[0:NeedleChecksumSize+TimestampSize+padding]...)
 		}
 
-		return offset, n.DataSize, GetActualSize(n.Size, version), err
+		return writeBytes, n.DataSize, GetActualSize(n.Size, version), nil
 	}
-	return 0, 0, 0, fmt.Errorf("Unsupported Version! (%d)", version)
+
+	return writeBytes, 0, 0, fmt.Errorf("Unsupported Version! (%d)", version)
+}
+
+func (n *Needle) Append(w *os.File, version Version) (offset uint64, size uint32, actualSize int64, err error) {
+
+	mem_map, exists := memory_map.FileMemoryMap[w.Name()]
+	if !exists {
+		if end, e := w.Seek(0, io.SeekEnd); e == nil {
+			defer func(w *os.File, off int64) {
+				if err != nil {
+					if te := w.Truncate(end); te != nil {
+						glog.V(0).Infof("Failed to truncate %s back to %d with error: %v", w.Name(), end, te)
+					}
+				}
+			}(w, end)
+			offset = uint64(end)
+		} else {
+			err = fmt.Errorf("Cannot Read Current Volume Position: %v", e)
+			return
+		}
+	} else {
+		offset = uint64(mem_map.End_Of_File + 1)
+	}
+
+	bytesToWrite, size, actualSize, err := n.prepareWriteBuffer(version)
+
+	if err == nil {
+		if exists {
+			memory_map.WriteMemory(mem_map, offset, uint64(len(bytesToWrite)), bytesToWrite)
+		} else {
+			_, err = w.Write(bytesToWrite)
+		}
+	}
+
+	return offset, size, actualSize, err
 }
 
 func ReadNeedleBlob(r *os.File, offset int64, size uint32, version Version) (dataSlice []byte, err error) {
-	dataSlice = make([]byte, int(GetActualSize(size, version)))
-	_, err = r.ReadAt(dataSlice, offset)
-	return dataSlice, err
+
+	dataSize := GetActualSize(size, version)
+	dataSlice = make([]byte, dataSize)
+
+	mem_map, exists := memory_map.FileMemoryMap[r.Name()]
+	if exists {
+		mem_buffer, err := memory_map.ReadMemory(mem_map, uint64(offset), uint64(dataSize))
+		copy(dataSlice, mem_buffer.Buffer)
+		memory_map.ReleaseMemory(mem_buffer)
+		return dataSlice, err
+	} else {
+		_, err = r.ReadAt(dataSlice, offset)
+		return dataSlice, err
+	}
 }
 
 // ReadBytes hydrates the needle from the bytes buffer, with only n.Id is set.
@@ -280,14 +288,27 @@ func ReadNeedleHeader(r *os.File, version Version, offset int64) (n *Needle, byt
 	n = new(Needle)
 	if version == Version1 || version == Version2 || version == Version3 {
 		bytes = make([]byte, NeedleHeaderSize)
-		var count int
-		count, err = r.ReadAt(bytes, offset)
-		if count <= 0 || err != nil {
-			return nil, bytes, 0, err
+
+		mem_map, exists := memory_map.FileMemoryMap[r.Name()]
+		if exists {
+			mem_buffer, err := memory_map.ReadMemory(mem_map, uint64(offset), NeedleHeaderSize)
+			copy(bytes, mem_buffer.Buffer)
+			memory_map.ReleaseMemory(mem_buffer)
+
+			if err != nil {
+				return nil, bytes, 0, err
+			}
+		} else {
+			var count int
+			count, err = r.ReadAt(bytes, offset)
+			if count <= 0 || err != nil {
+				return nil, bytes, 0, err
+			}
 		}
 		n.ParseNeedleHeader(bytes)
 		bodyLength = NeedleBodyLength(n.Size, version)
 	}
+
 	return
 }