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node.go
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node.go
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// Copyright 2016 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
package libkbfs
import (
"context"
"fmt"
"runtime"
"github.com/keybase/client/go/kbfs/kbfsblock"
billy "gopkg.in/src-d/go-billy.v4"
)
// nodeCore holds info shared among one or more nodeStandard objects.
type nodeCore struct {
pathNode *pathNode
parent Node
cache *nodeCacheStandard
entryType EntryType
// used only when parent is nil (the object has been unlinked)
cachedPath path
cachedDe DirEntry
}
func newNodeCore(
ptr BlockPointer, name string, parent Node,
cache *nodeCacheStandard, et EntryType) *nodeCore {
return &nodeCore{
pathNode: &pathNode{
BlockPointer: ptr,
Name: name,
},
parent: parent,
cache: cache,
entryType: et,
}
}
func (c *nodeCore) ParentID() NodeID {
if c.parent == nil {
return nil
}
return c.parent.GetID()
}
// String is to support printing *nodeCore as a NodeID. If we want to
// print nodeCores as nodeCores (e.g., for debugging) we might have to
// implement Formatter.
func (c *nodeCore) String() string {
return fmt.Sprintf("%p", c)
}
type nodeStandard struct {
core *nodeCore
}
var _ Node = (*nodeStandard)(nil)
func nodeStandardFinalizer(n *nodeStandard) {
n.core.cache.forget(n.core)
}
func makeNodeStandard(core *nodeCore) *nodeStandard {
n := &nodeStandard{core}
runtime.SetFinalizer(n, nodeStandardFinalizer)
return n
}
func (n *nodeStandard) GetBlockID() (blockID kbfsblock.ID) {
return n.core.pathNode.BlockPointer.ID
}
func (n *nodeStandard) GetCanonicalPath() string {
return n.core.cache.PathFromNode(n).CanonicalPathString()
}
func (n *nodeStandard) GetID() NodeID {
return n.core
}
func (n *nodeStandard) GetFolderBranch() FolderBranch {
return n.core.cache.folderBranch
}
func (n *nodeStandard) GetBasename() string {
if len(n.core.cachedPath.path) > 0 {
// Must be unlinked.
return ""
}
return n.core.pathNode.Name
}
func (n *nodeStandard) Readonly(_ context.Context) bool {
return false
}
func (n *nodeStandard) ShouldCreateMissedLookup(ctx context.Context, _ string) (
bool, context.Context, EntryType, string) {
return false, ctx, File, ""
}
func (n *nodeStandard) ShouldRetryOnDirRead(ctx context.Context) bool {
return false
}
func (n *nodeStandard) RemoveDir(_ context.Context, _ string) (
removeHandled bool, err error) {
return false, nil
}
func (n *nodeStandard) WrapChild(child Node) Node {
return child
}
func (n *nodeStandard) Unwrap() Node {
return n
}
func (n *nodeStandard) GetFS(_ context.Context) billy.Filesystem {
return nil
}
func (n *nodeStandard) GetFile(_ context.Context) billy.File {
return nil
}
func (n *nodeStandard) EntryType() EntryType {
return n.core.entryType
}