1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
|
// Copyright (c) 2014-2015 The Notify Authors. All rights reserved.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
package notify
import (
"errors"
"os"
"path/filepath"
)
var errSkip = errors.New("notify: skip")
type walkPathFunc func(nd node, isbase bool) error
type walkFunc func(node) error
func errnotexist(name string) error {
return &os.PathError{
Op: "Node",
Path: name,
Err: os.ErrNotExist,
}
}
type node struct {
Name string
Watch watchpoint
Child map[string]node
}
func newnode(name string) node {
return node{
Name: name,
Watch: make(watchpoint),
Child: make(map[string]node),
}
}
func (nd node) addchild(name, base string) node {
child, ok := nd.Child[base]
if !ok {
child = newnode(name)
nd.Child[base] = child
}
return child
}
func (nd node) Add(name string) node {
i := indexbase(nd.Name, name)
if i == -1 {
return node{}
}
for j := indexSep(name[i:]); j != -1; j = indexSep(name[i:]) {
nd = nd.addchild(name[:i+j], name[i:i+j])
i += j + 1
}
return nd.addchild(name, name[i:])
}
func (nd node) AddDir(fn walkFunc, doNotWatch DoNotWatchFn) error {
stack := []node{nd}
Traverse:
for n := len(stack); n != 0; n = len(stack) {
nd, stack = stack[n-1], stack[:n-1]
switch err := fn(nd); err {
case nil:
case errSkip:
continue Traverse
default:
return &os.PathError{
Op: "error while traversing",
Path: nd.Name,
Err: err,
}
}
// TODO(rjeczalik): tolerate open failures - add failed names to
// AddDirError and notify users which names are not added to the tree.
f, err := os.Open(nd.Name)
if err != nil {
return err
}
names, err := f.Readdirnames(-1)
f.Close()
if err != nil {
return err
}
for _, name := range names {
name = filepath.Join(nd.Name, name)
if doNotWatch != nil && doNotWatch(name) {
continue
}
fi, err := os.Lstat(name)
if err != nil {
return err
}
if fi.Mode()&(os.ModeSymlink|os.ModeDir) == os.ModeDir {
stack = append(stack, nd.addchild(name, name[len(nd.Name)+1:]))
}
}
}
return nil
}
func (nd node) Get(name string) (node, error) {
i := indexbase(nd.Name, name)
if i == -1 {
return node{}, errnotexist(name)
}
ok := false
for j := indexSep(name[i:]); j != -1; j = indexSep(name[i:]) {
if nd, ok = nd.Child[name[i:i+j]]; !ok {
return node{}, errnotexist(name)
}
i += j + 1
}
if nd, ok = nd.Child[name[i:]]; !ok {
return node{}, errnotexist(name)
}
return nd, nil
}
func (nd node) Del(name string) error {
i := indexbase(nd.Name, name)
if i == -1 {
return errnotexist(name)
}
stack := []node{nd}
ok := false
for j := indexSep(name[i:]); j != -1; j = indexSep(name[i:]) {
if nd, ok = nd.Child[name[i:i+j]]; !ok {
return errnotexist(name[:i+j])
}
stack = append(stack, nd)
}
if nd, ok = nd.Child[name[i:]]; !ok {
return errnotexist(name)
}
nd.Child = nil
nd.Watch = nil
for name, i = base(nd.Name), len(stack); i != 0; name, i = base(nd.Name), i-1 {
nd = stack[i-1]
if nd := nd.Child[name]; len(nd.Watch) > 1 || len(nd.Child) != 0 {
break
} else {
nd.Child = nil
nd.Watch = nil
}
delete(nd.Child, name)
}
return nil
}
func (nd node) Walk(fn walkFunc, doNotWatch DoNotWatchFn) error {
stack := []node{nd}
Traverse:
for n := len(stack); n != 0; n = len(stack) {
nd, stack = stack[n-1], stack[:n-1]
switch err := fn(nd); err {
case nil:
case errSkip:
continue Traverse
default:
return err
}
for name, nd := range nd.Child {
if name == "" {
// Node storing inactive watchpoints has empty name, skip it
// form traversing. Root node has also an empty name, but it
// never has a parent node.
continue
}
if doNotWatch != nil && doNotWatch(nd.Name) {
continue
}
stack = append(stack, nd)
}
}
return nil
}
func (nd node) WalkPath(name string, fn walkPathFunc) error {
i := indexbase(nd.Name, name)
if i == -1 {
return errnotexist(name)
}
ok := false
for j := indexSep(name[i:]); j != -1; j = indexSep(name[i:]) {
switch err := fn(nd, false); err {
case nil:
case errSkip:
return nil
default:
return err
}
if nd, ok = nd.Child[name[i:i+j]]; !ok {
return errnotexist(name[:i+j])
}
i += j + 1
}
switch err := fn(nd, false); err {
case nil:
case errSkip:
return nil
default:
return err
}
if nd, ok = nd.Child[name[i:]]; !ok {
return errnotexist(name)
}
switch err := fn(nd, true); err {
case nil, errSkip:
return nil
default:
return err
}
}
type root struct {
nd node
}
func (r root) addroot(name string) node {
if vol := filepath.VolumeName(name); vol != "" {
root, ok := r.nd.Child[vol]
if !ok {
root = r.nd.addchild(vol, vol)
}
return root
}
return r.nd
}
func (r root) root(name string) (node, error) {
if vol := filepath.VolumeName(name); vol != "" {
nd, ok := r.nd.Child[vol]
if !ok {
return node{}, errnotexist(name)
}
return nd, nil
}
return r.nd, nil
}
func (r root) Add(name string) node {
return r.addroot(name).Add(name)
}
func (r root) AddDir(dir string, fn walkFunc, doNotWatch DoNotWatchFn) error {
return r.Add(dir).AddDir(fn, doNotWatch)
}
func (r root) Del(name string) error {
nd, err := r.root(name)
if err != nil {
return err
}
return nd.Del(name)
}
func (r root) Get(name string) (node, error) {
nd, err := r.root(name)
if err != nil {
return node{}, err
}
if nd.Name != name {
if nd, err = nd.Get(name); err != nil {
return node{}, err
}
}
return nd, nil
}
func (r root) Walk(name string, fn walkFunc, doNotWatch DoNotWatchFn) error {
nd, err := r.Get(name)
if err != nil {
return err
}
return nd.Walk(fn, doNotWatch)
}
func (r root) WalkPath(name string, fn walkPathFunc) error {
nd, err := r.root(name)
if err != nil {
return err
}
return nd.WalkPath(name, fn)
}
|