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entry.go
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entry.go
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package datafile
import (
"hash/crc32"
"io"
goruntime "runtime"
"time"
"github.com/octu0/bitcaskdb/runtime"
)
var (
_ io.ReadCloser = (*Entry)(nil)
)
type Header struct {
KeySize int32
ValueSize int64
Checksum uint32
Expiry time.Time
TotalSize int64
}
// Entry represents a key/value in the database
type Entry struct {
Key []byte
Value io.Reader
TotalSize int64
ValueSize int64
Checksum uint32
Expiry time.Time
closed bool
release func()
}
func (e *Entry) setFinalizer() {
goruntime.SetFinalizer(e, finalizeEntry)
}
func (e *Entry) Read(p []byte) (int, error) {
return e.Value.Read(p)
}
func (e *Entry) Close() error {
if e.closed != true {
e.closed = true
goruntime.SetFinalizer(e, nil) // clear finalizer
if e.release != nil {
e.release()
}
}
return nil
}
func (e *Entry) Validate(ctx runtime.Context) error {
pool := ctx.Buffer().BytePool()
buf := pool.Get()
defer pool.Put(buf)
c := crc32.New(crc32.IEEETable)
for {
n, err := e.Value.Read(buf)
if n < 0 {
return errNegativeRead
}
if err == io.EOF {
if c.Sum32() != e.Checksum {
return ErrChecksumFailed
}
return nil
}
if _, err := c.Write(buf[:n]); err != nil {
return err
}
}
}
func finalizeEntry(e *Entry) {
goruntime.SetFinalizer(e, nil) // clear finalizer
e.Close()
}