Improvements in collection storage. Breaks compatibility with previous versions!

package-lock.json

@@ -195,6 +195,15 @@
       "integrity": "sha512-FwI9gX75FgVBJ7ywgnq/P7tw+/o1GUbtP0KzbtusLigAOgIgNISRK0ZPl4qertvXSIE8YbsVJueQ90cDt9YYyw==",
       "dev": true
     },
+    "@types/nanoid": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@types/nanoid/-/nanoid-2.1.0.tgz",
+      "integrity": "sha512-xdkn/oRTA0GSNPLIKZgHWqDTWZsVrieKomxJBOQUK9YDD+zfSgmwD5t4WJYra5S7XyhTw7tfvwznW+pFexaepQ==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/node": {
       "version": "12.12.5",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.5.tgz",
@@ -2645,9 +2654,9 @@
       "optional": true
     },
     "nanoid": {
-      "version": "2.1.1",
+      "version": "2.1.6",
-      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-2.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-2.1.6.tgz",
-      "integrity": "sha512-0YbJdaL4JFoejIOoawgLcYValFGJ2iyUuVDIWL3g8Es87SSOWFbWdRUMV3VMSiyPs3SQ3QxCIxFX00q5DLkMCw=="
+      "integrity": "sha512-2NDzpiuEy3+H0AVtdt8LoFi7PnqkOnIzYmJQp7xsEU6VexLluHQwKREuiz57XaQC5006seIadPrIZJhyS2n7aw=="
     },
     "nanomatch": {
       "version": "1.2.13",

package.json

@@ -21,8 +21,8 @@
     "@types/koa-router": "^7.0.42",
     "@types/leveldown": "^4.0.1",
     "@types/levelup": "^3.1.1",
+    "@types/nanoid": "^2.1.0",
     "@types/node": "^12.12.5",
-    "@types/shortid": "0.0.29",
     "@types/ws": "^6.0.3",
     "concurrently": "^5.0.0",
     "nodemon": "^1.19.4",
@@ -40,7 +40,7 @@
     "koa-router": "^7.4.0",
     "leveldown": "^5.4.1",
     "levelup": "^4.3.2",
-    "shortid": "^2.2.15",
+    "nanoid": "^2.1.6",
     "what-the-pack": "^2.0.3",
     "ws": "^7.2.0"
   }

src/connection.ts

@@ -4,7 +4,7 @@ import { DatabaseManager } from "./database/database";
 import Logging from "@hibas123/logging";
 import Query from "./database/query";
 import Session from "./database/session";
-import shortid = require("shortid");
+import nanoid = require("nanoid");
 
 import * as JWT from "jsonwebtoken";
 
@@ -51,7 +51,7 @@ export class ConnectionManager {
       const sendError = (error: string) => socket.send(JSON.stringify({ ns: "error_msg", data: error }));
 
 
-      const session = new Session(shortid());
+      const session = new Session(nanoid());
 
       let query = new URLSearchParams(req.url.split("?").pop());
 
@@ -104,6 +104,16 @@ export class ConnectionManager {
 
       const noperm = new Error("No permisison!");
 
+      if (session.root) {
+         queryHandler.set("collections", (query, perm, data) => {
+            return query.getCollections();
+         })
+
+         queryHandler.set("delete-collection", (query, perm, data) => {
+            return query.deleteCollection();
+         })
+      }
+
       queryHandler.set("keys", (query, perm, data) => {
          if (!perm.read)
             throw noperm;
@@ -128,6 +138,12 @@ export class ConnectionManager {
          return query.update(data);
       })
 
+      queryHandler.set("push", (query, perm, data) => {
+         if (!perm.write)
+            throw noperm;
+         return query.push(data);
+      })
+
       queryHandler.set("delete", (query, perm, data) => {
          if (!perm.write)
             throw noperm;
@@ -138,7 +154,7 @@ export class ConnectionManager {
          if (!perm.read)
             throw noperm;
 
-         let subscriptionID = shortid.generate();
+         let subscriptionID = nanoid();
 
          query.subscribe((data) => {
             socket.send(JSON.stringify({ ns: "event", data: { id: subscriptionID, data } }));
@@ -156,8 +172,6 @@ export class ConnectionManager {
          //TODO: Handle case with no id, type, path
          Logging.debug(`Request with id '${id}' from type '${type}' and path '${path}' with data`, data)
 
-
-
          try {
             if (!db)
                throw new Error("Database not found!");
@@ -170,7 +184,7 @@ export class ConnectionManager {
                   const perms = db.rules.hasPermission(path, session);
 
                   let res = await handler(query, perms, data);
-                  if (res[StoreSym] !== undefined) {
+                  if (res && typeof res === "object" && res[StoreSym] !== undefined) {
                      if (res[StoreSym])
                         stored.set(id, query);
                      else
@@ -180,7 +194,8 @@ export class ConnectionManager {
                }
             }
          } catch (err) {
-            Logging.error(err);
+            // Logging.error(err);
+            Logging.debug("Sending error:", err);
             answer(id, err.message, true);
          }
       })

src/database/database.ts

@@ -54,12 +54,17 @@ export class Database {
    private level = getLevelDB(this.name);
 
    get data() {
-      return this.level;
+      return this.level.data;
+   }
+
+   get collections() {
+      return this.level.collection;
    }
 
 
    public rules: Rules;
    public locks = new DocumentLock()
+   public collectionLocks = new DocumentLock()
 
    public changes = new Map<string, Set<(change: Change) => void>>();
 
@@ -89,8 +94,8 @@ export class Database {
    }
 
    async setRootKey(key: string) {
-      await Settings.setDatabaseAccessKey(this.name, key);
+      await Settings.setDatabaseRootKey(this.name, key);
-      this.accesskey = key;
+      this.rootkey = key;
    }
 
    async setPublicKey(key: string) {

src/database/lock.ts

@@ -3,6 +3,10 @@ export type Release = { release: () => void };
 export default class DocumentLock {
    private locks = new Map<string, (() => void)[]>();
 
+   getLocks() {
+      return Array.from(this.locks.keys())
+   }
+
    async lock(collection: string = "", document: string = "") {
       let key = collection + "/" + document;
       let l = this.locks.get(key);

src/database/query.ts

@@ -1,11 +1,13 @@
 import { Database, Change, ChangeTypes } from "./database";
 import { resNull } from "../storage";
-import shortid = require("shortid");
+import nanoid = require("nanoid/generate");
 import Logging from "@hibas123/nodelogging";
 import * as MSGPack from "what-the-pack";
 
 export const MP = MSGPack.initialize(2 ** 20);
 
+const ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
 const { encode, decode } = MP;
 
 interface ISubscribeOptions {
@@ -33,39 +35,28 @@ export default class Query {
    }
 
 
-   private async resolve(path: string[], create = false): Promise<{ collection: string, document: string }> {
+   private async resolve(path: string[], create = false): Promise<{ collection: string, document: string, collectionKey: string }> {
       path = [...path]; // Create modifiable copy
       let collectionID: string = undefined;
-      let documentKey = undefined;
+      let documentKey = path.length % 2 === 0 ? path.pop() : undefined;
-      while (path.length > 0) {
+      let key = path.join("/");
-         let collectionName = path.shift();
-         let key = `${collectionID || ""}/${documentKey || ""}/${collectionName}`;
-         let lock = await this.database.locks.lock(collectionID, documentKey);
-         try {
-            collectionID = await this.database.data.get(key).then(r => r.toString()).catch(resNull);
 
-            if (!collectionID) {
+      const lock = await this.database.collectionLocks.lock(key);
-               if (create) {
-                  collectionID = shortid.generate();
-                  await this.database.data.put(key, Buffer.from(collectionID));
-               } else {
-                  return { collection: null, document: null };
-               }
-            }
 
-
+      try {
-            if (path.length > 0)
+         collectionID = await this.database.collections.get(key).then(r => r.toString()).catch(resNull);
-               documentKey = path.shift();
+         if (!collectionID && create) {
-            else
+            collectionID = nanoid(ALPHABET, 32);
-               documentKey = undefined;
+            await this.database.collections.put(key, collectionID);
-         } finally {
-            lock();
          }
+      } finally {
+         lock();
       }
 
       return {
          collection: collectionID,
-         document: documentKey
+         document: documentKey,
+         collectionKey: key
       };
    }
 
@@ -123,12 +114,12 @@ export default class Query {
          let keys = [];
          const stream = this.database.data.createKeyStream({
             gt,
-            lt
+            lt,
+            keyAsBuffer: false
          })
-         stream.on("data", (key: string | Buffer) => {
+         stream.on("data", (key: string) => {
-            key = key.toString();
+            let s = key.split("/", 2);
-            let s = key.split("/");
+            if (s.length > 1)
-            if (s.length === 2)
                keys.push(s[1]);
          });
          stream.on("end", () => yes(keys));
@@ -159,7 +150,7 @@ export default class Query {
    }
 
    public async push(value: any) {
-      let id = shortid.generate();
+      let id = nanoid(ALPHABET, 32);
       let q = new Query(this.database, [...this.path, id], this.sender);
       await q.set(value, {});
       return id;
@@ -189,7 +180,43 @@ export default class Query {
       //TODO: Implement
    }
 
-   subscription: {
+   public async getCollections() {
+      return new Promise<string[]>((yes, no) => {
+         let keys = [];
+         const stream = this.database.data.createKeyStream({ keyAsBuffer: false })
+         stream.on("data", (key: string) => keys.push(key.split("/")));
+         stream.on("end", () => yes(keys));
+         stream.on("error", no);
+      });
+   }
+
+   public async deleteCollection() {
+      const { collection, document, collectionKey } = await this.resolve(this.path);
+
+      if (document) {
+         throw new Error("There can be no document defined on this operation");
+      }
+
+      let batch = this.database.data.batch();
+      try {
+         if (collection) {
+            let keys = await this.keys();
+            for (let key in keys) {
+               batch.del(key);
+            }
+            await batch.write();
+            batch = undefined;
+            await this.database.collections.del(collectionKey);
+         }
+      } finally {
+         if (batch)
+            batch.clear();
+      }
+   }
+
+
+
+   private subscription: {
       key: string;
       type: Set<ChangeTypes>;
       send: (data: Omit<Change, "sender">) => void;
@@ -213,6 +240,8 @@ export default class Query {
          type: new Set(type || [])
       };
 
+      Logging.debug("Existing?", options.existing)
+
       if (options.existing) {
          if (document) {
             send({

src/settings.ts

@@ -11,7 +11,7 @@ interface IDatabaseConfig {
 
 
 class SettingComponent {
-   db = getLevelDB("_server");
+   db = getLevelDB("_server").data;
    databaseLock = new Lock();
 
    constructor() { }

src/storage.ts

@@ -9,8 +9,9 @@ import LevelDown, { LevelDown as LD } from "leveldown";
 import { AbstractIterator } from "abstract-leveldown";
 
 export type LevelDB = LU<LD, AbstractIterator<any, any>>;
+export type DBSet = { data: LevelDB, collection: LevelDB };
 
-const databases = new Map<string, LevelDB>();
+const databases = new Map<string, DBSet>();
 
 export function resNull(err): null {
    if (!err.notFound)
@@ -38,19 +39,31 @@ export async function deleteLevelDB(name: string) {
       return;
    let db = databases.get(name);
 
-   if (db && !db.isClosed())
+   if (db) {
-      await db.close()
+      if (db.data.isOpen())
+         await db.data.close()
+      if (db.collection.isOpen())
+         await db.collection.close()
+   }
 
 
    //TODO make sure, that name doesn't make it possible to delete all databases :)
    await rmRecursice("./databases/" + name);
 }
 
-export default function getLevelDB(name: string): LevelDB {
+export default function getLevelDB(name: string): DBSet {
    let db = databases.get(name);
-   if (!db || db.isClosed()) {
+   if (!db) {
-      db = LevelUp(LevelDown("./databases/" + name));
+      if (!fs.existsSync("./databases/" + name)) {
-      databases.set(name, db);
+         fs.mkdirSync("./databases/" + name);
+      }
    }
+
+   db = {
+      data: db && db.data.isOpen() ? db.data : LevelUp(LevelDown("./databases/" + name + "/data")),
+      collection: db && db.collection.isOpen() ? db.collection : LevelUp(LevelDown("./databases/" + name + "/collection"))
+   }
+
+   databases.set(name, db);
    return db;
 }