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snap.go
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snap.go
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package main
import (
"io"
"github.com/Ankr-Shanghai/chainkv/retcode"
"github.com/Ankr-Shanghai/chainkv/types"
)
func NewSnap(kvs *kvserver) types.ID {
kvs.snapLock.Lock()
defer kvs.snapLock.Unlock()
kvs.snapIdx++
idx := types.ID(kvs.snapIdx)
snap := kvs.db.NewSnapshot()
kvs.snapCache.Set(idx.String(), snap)
return idx
}
func NewSnapHandler(kvs *kvserver, req *types.Request) *types.Response {
rsp := &types.Response{
Code: retcode.CodeOK,
}
rsp.Id = NewSnap(kvs)
return rsp
}
func SnapGetHandler(kvs *kvserver, req *types.Request) *types.Response {
var (
rsp = &types.Response{
Code: retcode.CodeOK,
}
closer io.Closer
err error
)
snap, _ := kvs.snapCache.Get(req.Id.String())
rsp.Val, closer, err = snap.Get(req.Key)
if err != nil {
kvs.log.Error("SnapGetHandler", "err", err)
rsp.Code = retcode.ErrGet
}
if closer != nil {
closer.Close()
}
return rsp
}
func SnapHasHandler(kvs *kvserver, req *types.Request) *types.Response {
var (
rsp = &types.Response{
Code: retcode.CodeOK,
}
closer io.Closer
err error
)
snap, _ := kvs.snapCache.Get(req.Id.String())
_, closer, err = snap.Get(req.Key)
if err != nil {
rsp.Exist = false
rsp.Code = retcode.ErrGet
}
if closer != nil {
closer.Close()
}
return rsp
}
func SnapReleaseHandler(kvs *kvserver, req *types.Request) *types.Response {
var (
rsp = &types.Response{
Code: retcode.CodeOK,
}
)
snap, _ := kvs.snapCache.Get(req.Id.String())
kvs.closer <- func() {
kvs.snapCache.Remove(req.Id.String())
snap.Close()
}
return rsp
}