feat: started localstorage persistance

package.json

@@ -4,9 +4,20 @@
   "description": "In-memory file-system with Node's fs API.",
   "main": "lib/index.js",
   "keywords": [
-    "fs", "filesystem", "fs.js", "memory-fs", "memfs",
-    "file", "file system", "mount", "memory", "in-memory",
-    "virtual", "test", "testing", "mock"
+    "fs",
+    "filesystem",
+    "fs.js",
+    "memory-fs",
+    "memfs",
+    "file",
+    "file system",
+    "mount",
+    "memory",
+    "in-memory",
+    "virtual",
+    "test",
+    "testing",
+    "mock"
   ],
   "repository": {
     "type": "git",

src/node.ts

@@ -204,6 +204,26 @@ export class Node extends EventEmitter {
 
         return false;
     }
+
+    del() {
+        this.emit('delete', this);
+    }
+
+    toJSON() {
+        return {
+            ino: this.ino,
+            uid: this.uid,
+            gid: this.gid,
+            atime: this.atime.getTime(),
+            mtime: this.mtime.getTime(),
+            ctime: this.ctime.getTime(),
+            perm: this.perm,
+            mode: this.mode,
+            nlink: this.nlink,
+            symlink: this.symlink,
+            data: this.getString(),
+        };
+    }
 }
 
 

src/volume-localstorage.ts

@@ -0,0 +1,78 @@
+import {Volume} from "./volume";
+import {Link, Node} from "./node";
+
+const LS = {};
+
+export class NodeLocalstorage extends Node {
+    key() {
+        return `memfs.ino.${this.ino}`;
+    }
+
+    sync() {
+        LS[this.key()] = this.toJSON();
+    }
+
+    touch() {
+        super.touch();
+        this.sync();
+    }
+
+    del() {
+        delete LS[this.key()];
+    }
+}
+
+export class LinkLocalstorage extends Link {
+
+}
+
+export class VolumeLocalstorage extends Volume {
+    constructor() {
+        super({
+            Node: NodeLocalstorage,
+            Link: LinkLocalstorage,
+        });
+
+
+    }
+}
+
+export function createVolume(namespace: string, LS = localStorage) {
+
+    const key = (type, id) => `memfs.${namespace}.${type}.${id}`;
+
+    export class NodeLocalstorage extends Node {
+        key() {
+            return key('ino', this.ino);
+        }
+
+        sync() {
+            LS[this.key()] = this.toJSON();
+        }
+
+        touch() {
+            super.touch();
+            this.sync();
+        }
+
+        del() {
+            super.del();
+            delete LS[this.key()];
+        }
+    }
+
+    export class LinkLocalstorage extends Link {
+
+    }
+
+    export class VolumeLocalstorage extends Volume {
+        constructor() {
+            super({
+                Node: NodeLocalstorage,
+                Link: LinkLocalstorage,
+            });
+
+
+        }
+    }
+}

src/volume.ts

@@ -543,8 +543,16 @@ export class Volume {
     WriteStream: new (...args) => IWriteStream;
     FSWatcher: new () => FSWatcher;
 
-    constructor() {
-        const root = new Link(this, null, '');
+    props: {
+        Node: new (...args) => Node,
+        Link: new (...args) => Link,
+        File: new (...File) => File,
+    };
+
+    constructor(props = {}) {
+        this.props = extend(props, {Node, Link, File});
+
+        const root = new this.props.Link(this, null, '');
         root.setNode(this.createNode(true));
 
         const self = this;
@@ -612,7 +620,7 @@ export class Volume {
     }
 
     createNode(isDirectory: boolean = false, perm?: number): Node {
-        const node = new Node(this.newInoNumber(), perm);
+        const node = new this.props.Node(this.newInoNumber(), perm);
         if(isDirectory) node.setIsDirectory();
         this.inodes[node.ino] = node;
         return node;
@@ -623,6 +631,7 @@ export class Volume {
     }
 
     private deleteNode(node: Node) {
+        node.del();
         delete this.inodes[node.ino];
         this.releasedInos.push(node.ino);
     }
@@ -815,7 +824,7 @@ export class Volume {
         this.releasedFds = [];
         this.openFiles = 0;
 
-        this.root = new Link(this, null, '');
+        this.root = new this.props.Link(this, null, '');
         this.root.setNode(this.createNode(true));
     }
 
@@ -848,7 +857,7 @@ export class Volume {
 
         }
 
-        const file = new File(link, node, flagsNum, this.newFdNumber());
+        const file = new this.props.File(link, node, flagsNum, this.newFdNumber());
         this.fds[file.fd] = file;
         this.openFiles++;