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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"
"os"
"runtime"
"time"
"github.com/keybase/client/go/kbfs/data"
"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 *data.PathNode
parent Node
cache *nodeCacheStandard
entryType data.EntryType
// used only when parent is nil (the object has been unlinked)
cachedPath data.Path
cachedDe data.DirEntry
obfuscator data.Obfuscator
}
func newNodeCore(
ptr data.BlockPointer, name data.PathPartString, parent Node,
cache *nodeCacheStandard, et data.EntryType) *nodeCore {
return &nodeCore{
pathNode: &data.PathNode{
BlockPointer: ptr,
Name: name,
},
parent: parent,
cache: cache,
entryType: et,
}
}
func newNodeCoreForDir(
ptr data.BlockPointer, name data.PathPartString, parent Node,
cache *nodeCacheStandard, obfuscator data.Obfuscator) *nodeCore {
nc := newNodeCore(ptr, name, parent, cache, data.Dir)
nc.obfuscator = obfuscator
return nc
}
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) GetPathPlaintextSansTlf() (string, bool) {
return n.core.cache.PathFromNode(n).PlaintextSansTlf()
}
func (n *nodeStandard) GetID() NodeID {
return n.core
}
func (n *nodeStandard) GetFolderBranch() data.FolderBranch {
return n.core.cache.folderBranch
}
func (n *nodeStandard) GetBasename() data.PathPartString {
if len(n.core.cachedPath.Path) > 0 {
// Must be unlinked.
return data.PathPartString{}
}
return n.core.pathNode.Name
}
func (n *nodeStandard) Readonly(_ context.Context) bool {
return false
}
func (n *nodeStandard) ShouldCreateMissedLookup(
ctx context.Context, _ data.PathPartString) (
bool, context.Context, data.EntryType, os.FileInfo, data.PathPartString,
data.BlockPointer) {
return false, ctx, data.File, nil, data.PathPartString{}, data.ZeroPtr
}
func (n *nodeStandard) ShouldRetryOnDirRead(ctx context.Context) bool {
return false
}
func (n *nodeStandard) RemoveDir(_ context.Context, _ data.PathPartString) (
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) NodeFSReadOnly {
return nil
}
func (n *nodeStandard) GetFile(_ context.Context) billy.File {
return nil
}
func (n *nodeStandard) EntryType() data.EntryType {
return n.core.entryType
}
func (n *nodeStandard) FillCacheDuration(d *time.Duration) {}
func (n *nodeStandard) Obfuscator() data.Obfuscator {
return n.core.obfuscator
}
func (n *nodeStandard) ChildName(name string) data.PathPartString {
if n.core.entryType != data.Dir {
panic("Only dirs can have child names")
}
return data.NewPathPartString(name, n.core.obfuscator)
}