mirror of https://github.com/kubernetes/kops.git
172 lines
3.4 KiB
Go
172 lines
3.4 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package vfs
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import (
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path"
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"strings"
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"sync"
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)
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type MemFSPath struct {
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context *MemFSContext
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location string
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mutex sync.Mutex
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contents []byte
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children map[string]*MemFSPath
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}
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var _ Path = &MemFSPath{}
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type MemFSContext struct {
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clusterReadable bool
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root *MemFSPath
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}
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func NewMemFSContext() *MemFSContext {
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c := &MemFSContext{}
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c.root = &MemFSPath{
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context: c,
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location: "",
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}
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return c
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}
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// MarkClusterReadable pretends the current memfscontext is cluster readable; this is useful for tests
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func (c *MemFSContext) MarkClusterReadable() {
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c.clusterReadable = true
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}
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func (c *MemFSPath) HasChildren() bool {
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return len(c.children) != 0
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}
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func (c *MemFSPath) IsClusterReadable() bool {
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return c.context.clusterReadable
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}
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var _ HasClusterReadable = &MemFSPath{}
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func NewMemFSPath(context *MemFSContext, location string) *MemFSPath {
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return context.root.Join(location).(*MemFSPath)
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}
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func (p *MemFSPath) Join(relativePath ...string) Path {
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p.mutex.Lock()
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defer p.mutex.Unlock()
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joined := path.Join(relativePath...)
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tokens := strings.Split(joined, "/")
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current := p
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for _, token := range tokens {
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if current.children == nil {
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current.children = make(map[string]*MemFSPath)
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}
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child := current.children[token]
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if child == nil {
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child = &MemFSPath{
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context: p.context,
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location: path.Join(current.location, token),
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}
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current.children[token] = child
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}
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current = child
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}
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return current
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}
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func (p *MemFSPath) WriteFile(r io.ReadSeeker, acl ACL) error {
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data, err := ioutil.ReadAll(r)
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if err != nil {
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return fmt.Errorf("error reading data: %v", err)
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}
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p.contents = data
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return nil
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}
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func (p *MemFSPath) CreateFile(data io.ReadSeeker, acl ACL) error {
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// Check if exists
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if p.contents != nil {
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return os.ErrExist
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}
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return p.WriteFile(data, acl)
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}
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// ReadFile implements Path::ReadFile
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func (p *MemFSPath) ReadFile() ([]byte, error) {
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if p.contents == nil {
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return nil, os.ErrNotExist
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}
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// TODO: Copy?
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return p.contents, nil
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}
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// WriteTo implements io.WriterTo
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func (p *MemFSPath) WriteTo(out io.Writer) (int64, error) {
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if p.contents == nil {
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return 0, os.ErrNotExist
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}
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n, err := out.Write(p.contents)
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return int64(n), err
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}
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func (p *MemFSPath) ReadDir() ([]Path, error) {
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var paths []Path
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for _, f := range p.children {
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paths = append(paths, f)
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}
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return paths, nil
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}
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func (p *MemFSPath) ReadTree() ([]Path, error) {
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var paths []Path
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p.readTree(&paths)
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return paths, nil
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}
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func (p *MemFSPath) readTree(dest *[]Path) {
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for _, f := range p.children {
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if !f.HasChildren() {
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*dest = append(*dest, f)
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}
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f.readTree(dest)
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}
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}
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func (p *MemFSPath) Base() string {
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return path.Base(p.location)
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}
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func (p *MemFSPath) Path() string {
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return "memfs://" + p.location
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}
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func (p *MemFSPath) String() string {
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return p.Path()
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}
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func (p *MemFSPath) Remove() error {
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p.contents = nil
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return nil
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}
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