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package log_buffer
import (
"fmt"
"time"
)
type MemBuffer struct {
buf []byte
size int
startTime time.Time
stopTime time.Time
startOffset int64 // First offset in this buffer
offset int64 // Last offset in this buffer (endOffset)
}
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, startOffset int64, endOffset int64) (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[i].startOffset = sbs.buffers[i+1].startOffset
sbs.buffers[i].offset = sbs.buffers[i+1].offset
}
sbs.buffers[size-1].buf = buf
sbs.buffers[size-1].size = pos
sbs.buffers[size-1].startTime = startTime
sbs.buffers[size-1].stopTime = stopTime
sbs.buffers[size-1].startOffset = startOffset
sbs.buffers[size-1].offset = endOffset
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)
}
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