1 files changed, 62 insertions, 0 deletions
diff --git a/weed/util/log_buffer/sealed_buffer.go b/weed/util/log_buffer/sealed_buffer.go
new file mode 100644
index 000000000..d133cf8d3
--- /dev/null
+++ b/weed/util/log_buffer/sealed_buffer.go
@@ -0,0 +1,62 @@
+package log_buffer
+
+import (
+	"fmt"
+	"time"
+)
+
+type MemBuffer struct {
+	buf       []byte
+	size      int
+	startTime time.Time
+	stopTime  time.Time
+}
+
+type SealedBuffers struct {
+	buffers []*MemBuffer
+}
+
+func newSealedBuffers(size int) *SealedBuffers {
+	sbs := &SealedBuffers{}
+
+	sbs.buffers = make([]*MemBuffer, size)
+	for i := 0; i < size; i++ {
+		sbs.buffers[i] = &MemBuffer{
+			buf: make([]byte, BufferSize),
+		}
+	}
+
+	return sbs
+}
+
+func (sbs *SealedBuffers) SealBuffer(startTime, stopTime time.Time, buf []byte, pos int) (newBuf []byte) {
+	oldMemBuffer := sbs.buffers[0]
+	size := len(sbs.buffers)
+	for i := 0; i < size-1; i++ {
+		sbs.buffers[i].buf = sbs.buffers[i+1].buf
+		sbs.buffers[i].size = sbs.buffers[i+1].size
+		sbs.buffers[i].startTime = sbs.buffers[i+1].startTime
+		sbs.buffers[i].stopTime = sbs.buffers[i+1].stopTime
+	}
+	sbs.buffers[size-1].buf = buf
+	sbs.buffers[size-1].size = pos
+	sbs.buffers[size-1].startTime = startTime
+	sbs.buffers[size-1].stopTime = stopTime
+	return oldMemBuffer.buf
+}
+
+func (mb *MemBuffer) locateByTs(lastReadTime time.Time) (pos int) {
+	lastReadTs := lastReadTime.UnixNano()
+	for pos < len(mb.buf) {
+		size, t := readTs(mb.buf, pos)
+		if t > lastReadTs {
+			return
+		}
+		pos += size + 4
+	}
+	return len(mb.buf)
+}
+
+func (mb *MemBuffer) String() string {
+	return fmt.Sprintf("[%v,%v] bytes:%d", mb.startTime, mb.stopTime, mb.size)
+}