632 lines
18 KiB
TypeScript
632 lines
18 KiB
TypeScript
import { Database, Change, ChangeTypes } from "./database";
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import { resNull } from "../storage";
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import nanoid = require("nanoid/generate");
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import Logging from "@hibas123/nodelogging";
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import * as MSGPack from "what-the-pack";
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import Session from "./session";
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import { LevelUpChain } from "levelup";
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export type IWriteQueries = "set" | "update" | "delete" | "add";
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export type ICollectionQueries = "get" | "add" | "keys" | "delete-collection" | "list";
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export type IDocumentQueries = "get" | "set" | "update" | "delete";
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export interface ITypedQuery<T> {
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path: string[];
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type: T;
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data?: any;
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options?: any;
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}
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export type IQuery = ITypedQuery<ICollectionQueries | IDocumentQueries | "snapshot">;
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export const MP = MSGPack.initialize(2 ** 20);
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const ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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const { encode, decode } = MP;
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type Runner = (collection: string, document: string, batch: LevelUpChain, collectionKey: string) => any;
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interface IPreparedQuery {
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createCollection: boolean;
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needDocument: boolean;
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batchCompatible: boolean;
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runner: Runner;
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additionalLock?: string[];
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}
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interface DocRes {
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id: string;
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data: any;
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}
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export abstract class Query {
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/**
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* Returns true if the path only contains valid characters and false if it doesn't
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* @param path Path to be checked
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*/
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private validatePath(path: string[]) {
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return path.every(e => (e.match(/[^a-zA-Z0-9_\-\<\>]/g) || []).length === 0);
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}
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public changes: Change[] = [];
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public readonly createCollection: boolean;
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public readonly needDocument: boolean;
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public readonly batchCompatible: boolean;
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public readonly additionalLock?: string[];
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private readonly _runner: Runner;
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constructor(protected database: Database, protected session: Session, protected query: IQuery, snapshot = false) {
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if (query.path.length > 10) {
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throw new QueryError("Path is to long. Path is only allowed to be 10 Layers deep!");
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}
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if (!this.validatePath(query.path)) {
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throw new QueryError("Path can only contain a-z A-Z 0-9 '-' '-' '<' and '>' ");
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}
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if (!snapshot) {
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let data = this.prepare(query);
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this.createCollection = data.createCollection;
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this.needDocument = data.needDocument;
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this.batchCompatible = data.batchCompatible;
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this.additionalLock = data.additionalLock;
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this._runner = data.runner;
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}
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}
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protected abstract prepare(query: IQuery): IPreparedQuery;
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protected getDoc(collection: string, document: string) {
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return this.database.data
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.get(Database.getKey(collection, document), { asBuffer: true })
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.then(res => decode<any>(res as Buffer)).catch(resNull);
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}
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protected sendChange(collection: string, document: string, type: ChangeTypes, data: any) {
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let change: Change = {
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type,
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document,
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collection,
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data,
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sender: this.session.id
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}
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this.changes.push(change);
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}
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protected static getConstructorParams(query: Query): [Database, Session, IQuery] {
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return [query.database, query.session, query.query];
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}
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protected abstract checkChange(change: Change): boolean;
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protected abstract firstSend(collection: string, document: string): Promise<any>;
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public run(collection: string, document: string, batch: LevelUpChain, collectionKey: string) {
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return this._runner.call(this, collection, document, batch, collectionKey);
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}
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public async snapshot(onChange: (change: (DocRes & { type: ChangeTypes })[]) => void) {
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const receivedChanges = (changes: Change[]) => {
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let res = changes.filter(change => this.checkChange(change)).map(change => {
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return {
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id: change.document,
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data: change.data,
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type: change.type
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}
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})
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if (res.length > 0)
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onChange(res);
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};
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const unsub = this.database.collectionChangeListener.subscribe(change => {
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if (change.key === collectionKey) {
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if (change.type === "create")
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addSubscriber(change.id);
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else
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removeSubscriber(); // Send delete for all elements (Don't know how to do this...)
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}
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})
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let { collection, document, collectionKey } = await this.database.resolve(this.query.path)
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let oldKey: string = undefined;
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const removeSubscriber = () => {
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if (!oldKey)
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return;
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let s = this.database.changeListener.get(oldKey);
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if (s) {
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s.delete(receivedChanges);
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if (s.size <= 0)
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this.database.changeListener.delete(oldKey);
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}
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oldKey = undefined;
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}
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const addSubscriber = (collection: string) => {
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let key = Database.getKey(collection, document);
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if (oldKey !== key) {
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if (oldKey !== undefined)
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removeSubscriber();
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let s = this.database.changeListener.get(key);
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if (!s) {
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s = new Set();
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this.database.changeListener.set(key, s);
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}
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s.add(receivedChanges);
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}
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}
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if (collection) {
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addSubscriber(collection);
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}
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return {
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unsubscribe: () => {
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unsub();
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removeSubscriber();
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},
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value: await this.firstSend(collection, document)
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}
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}
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}
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interface UpdateData {
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[path: string]: {
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type: "value" | "timestamp" | "increment" | "push";
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value: any;
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}
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}
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export class DocumentQuery extends Query {
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prepare(query: IQuery): IPreparedQuery {
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let type = query.type as IDocumentQueries;
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switch (type) {
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case "get":
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return {
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batchCompatible: false,
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createCollection: false,
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needDocument: false,
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runner: this.get
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}
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case "set":
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return {
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batchCompatible: true,
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createCollection: true,
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needDocument: true,
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runner: this.set
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}
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case "update":
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return {
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batchCompatible: true,
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createCollection: true,
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needDocument: true,
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runner: this.update
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}
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case "delete":
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return {
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batchCompatible: true,
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createCollection: false,
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needDocument: true,
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runner: this.delete
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}
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default:
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throw new Error("Invalid query type: " + type);
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}
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}
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private async get(collection: string, document: string) {
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if (!collection || !document) {
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return null;
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}
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return this.getDoc(collection, document);
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}
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private async set(collection: string, document: string, batch?: LevelUpChain) {
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const { data, options } = this.query;
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if (data === null)
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return this.delete(collection, document, batch);
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let isNew = !(await this.getDoc(collection, document))
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batch.put(Database.getKey(collection, document), encode(data))
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this.sendChange(collection, document, isNew ? "added" : "modified", data)
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}
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private async update(collection: string, document: string, batch?: LevelUpChain) {
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const updateData: UpdateData = this.query.data;
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let data = await this.getDoc(collection, document);
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let isNew = false
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if (!data) {
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isNew = true;
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data = {};
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}
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for (let path in updateData) {
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const toUpdate = updateData[path];
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let d = data;
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let parts = path.split(".");
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while (parts.length > 1) {
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let seg = parts.shift();
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if (!data[seg])
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data[seg] = {}
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d = data[seg];
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}
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const last = parts[0];
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switch (toUpdate.type) {
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case "value":
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d[last] = toUpdate.value;
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break;
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case "increment":
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if (d[last] === undefined || d[last] === null)
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d[last] = toUpdate.value;
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else if (typeof d[last] !== "number") {
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throw new QueryError("Field is no number!");
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} else {
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d[last] += toUpdate.value;
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}
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break;
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case "timestamp":
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d[last] = new Date().valueOf();
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break;
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case "push":
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if (d[last] === undefined || d[last] === null)
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d[last] = [toUpdate.value];
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else if (Array.isArray(d[last])) {
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d[last].push(toUpdate.value);
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} else {
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throw new QueryError("Field is not array!");
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}
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break;
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default:
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throw new QueryError("Invalid update type: " + toUpdate.type);
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}
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}
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if (batch) {
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batch.put(Database.getKey(collection, document), encode(data))
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} else {
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await this.database.data
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.put(Database.getKey(collection, document), encode(data))
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}
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this.sendChange(collection, document, isNew ? "added" : "modified", data)
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}
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private async delete(collection: string, document: string, batch?: LevelUpChain) {
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if (batch) {
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batch.del(Database.getKey(collection, document))
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} else {
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await this.database.data.del(Database.getKey(collection, document));
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}
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this.sendChange(collection, document, "deleted", null)
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}
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checkChange(change: Change) {
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return true;
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}
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firstSend(collection: string, document: string) {
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return this.get(collection, document);
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}
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public static fromQuery(query: Query) {
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return new DocumentQuery(...Query.getConstructorParams(query));
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}
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}
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type FieldPath = string;
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type WhereFilterOp =
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| '<'
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| '<='
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| '=='
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| '>='
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| '>'
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| 'array-contains'
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| 'in'
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| 'array-contains-any';
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interface IQueryWhereVerbose {
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fieldPath: FieldPath,
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opStr: WhereFilterOp,
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value: any
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}
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type IQueryWhereArray = [FieldPath, WhereFilterOp, any];
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type IQueryWhere = IQueryWhereArray | IQueryWhereVerbose;
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export class CollectionQuery extends Query {
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private _addId: string;
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prepare(query): IPreparedQuery {
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switch (query.type as ICollectionQueries) {
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case "add":
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this._addId = nanoid(ALPHABET, 32)
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return {
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batchCompatible: true,
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createCollection: true,
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needDocument: false,
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runner: this.add,
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additionalLock: [...query.path, this._addId]
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}
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case "get":
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const limit = (query.options || {}).limit;
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if (limit)
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this.limit = limit;
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const where = (query.options || {}).where;
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if (where)
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this.where = where;
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return {
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batchCompatible: false,
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createCollection: false,
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needDocument: false,
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runner: this.get
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}
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case "keys":
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return {
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batchCompatible: false,
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createCollection: false,
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needDocument: false,
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runner: this.keys
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}
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case "list":
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return {
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batchCompatible: false,
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createCollection: false,
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needDocument: false,
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runner: this.keys
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}
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case "delete-collection":
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return {
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batchCompatible: false,
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createCollection: false,
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needDocument: false,
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runner: this.deleteCollection
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}
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// run = () => q.deleteCollection();
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// break;
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default:
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throw new Error("Invalid query!");
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}
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}
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private _where: IQueryWhereArray[] = [];
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public set where(value: IQueryWhere[]) {
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const invalidWhere = new QueryError("Invalid Where");
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if (!Array.isArray(value))
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throw invalidWhere;
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let c = [];
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this._where = value.map(cond => {
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Logging.debug("Query Condition", cond);
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if (Array.isArray(cond)) {
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if (cond.length !== 3)
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throw invalidWhere;
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return cond;
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} else {
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if (cond && typeof cond === "object" && "fieldPath" in cond && "opStr" in cond && "value" in cond) {
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return [cond.fieldPath, cond.opStr, cond.value];
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} else {
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throw invalidWhere;
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}
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}
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})
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}
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public limit: number = -1;
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public async add(collection: string, document: string, batch: LevelUpChain, collectionKey: string) {
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let q = new DocumentQuery(this.database, this.session, {
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type: "set",
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path: this.additionalLock,
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data: this.query.data,
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options: this.query.options
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});
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await q.run(collection, this._addId, batch, collectionKey);
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return this._addId;
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}
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private getStreamOptions(collection: string) {
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let gt = Buffer.from(Database.getKey(collection) + " ");
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gt[gt.length - 1] = 0;
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let lt = Buffer.alloc(gt.length);
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lt.set(gt);
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lt[gt.length - 1] = 0xFF;
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return {
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gt,
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lt
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}
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}
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public async keys(collection: string) {
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if (!collection)
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return []
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return new Promise<string[]>((yes, no) => {
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let keys = [];
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const stream = this.database.data.createKeyStream({
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...this.getStreamOptions(collection),
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keyAsBuffer: false
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})
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stream.on("data", (key: string) => {
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let s = key.split("/", 2);
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if (s.length > 1)
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keys.push(s[1]);
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});
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stream.on("end", () => yes(keys));
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stream.on("error", no);
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});
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}
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private _getFieldValue(data: any, path: FieldPath) {
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let parts = path.split(".");
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let d = data;
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while (parts.length > 0) {
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let seg = parts.shift();
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d = data[seg];
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if (d === undefined || d === null)
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break; // Undefined/Null has no other fields!
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}
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return d;
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}
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private _fitsWhere(data: any): boolean {
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if (this._where.length > 0) {
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return this._where.every(([fieldPath, opStr, value]) => {
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let val = this._getFieldValue(data, fieldPath);
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switch (opStr) {
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case "<":
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return val < value;
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case "<=":
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return val <= value;
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case "==":
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return val == value;
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case ">=":
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return val >= value;
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case ">":
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return val > value;
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case "array-contains":
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if (Array.isArray(val)) {
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return val.some(e => e === value);
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}
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return false;
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// case "array-contains-any":
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case "in":
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if (typeof val === "object") {
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return value in val;
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}
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return false;
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default:
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throw new QueryError("Invalid where operation " + opStr);
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}
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})
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}
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return true;
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}
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async get(collection: string) {
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if (!collection)
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return [];
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return new Promise<DocRes[]>((yes, no) => {
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const stream = this.database.data.iterator({
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...this.getStreamOptions(collection),
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keyAsBuffer: false,
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valueAsBuffer: true
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})
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let values: DocRes[] = [];
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const onValue = (err: Error, key: string, value: Buffer) => {
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if (err) {
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no(err);
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stream.end(err => Logging.error(err));
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}
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else {
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if (!key && !value) {
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// END
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Logging.debug("Checked all!")
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yes(values);
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} else {
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let s = key.split("/", 2);
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if (s.length <= 1)
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return;
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const id = s[1];
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let data = decode(value);
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if (this._fitsWhere(data)) {
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if (this.limit < 0 || values.length < this.limit) {
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values.push({
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id,
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data
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});
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}
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else {
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stream.end((err) => err ? no(err) : yes(values))
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return;
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}
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}
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stream.next(onValue);
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}
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}
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}
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stream.next(onValue);
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})
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}
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checkChange(change: Change) {
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return this._fitsWhere(change.data);
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}
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firstSend(collection: string) {
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return this.get(collection)
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}
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public async collections() {
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if (!this.session.root)
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throw new QueryError("No Permission!");
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return new Promise<string[]>((yes, no) => {
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let keys = [];
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const stream = this.database.data.createKeyStream({ keyAsBuffer: false })
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stream.on("data", (key: string) => keys.push(key.split("/")));
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stream.on("end", () => yes(keys));
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stream.on("error", no);
|
|
});
|
|
}
|
|
|
|
public async deleteCollection(collection: string, document: string, _b: LevelUpChain, collectionKey: string) {
|
|
if (!this.session.root)
|
|
throw new QueryError("No Permission!");
|
|
|
|
//TODO: Lock whole collection!
|
|
let batch = this.database.data.batch();
|
|
try {
|
|
if (collection) {
|
|
let documents = await this.keys(collection);
|
|
// Logging.debug("To delete:", documents)
|
|
for (let document of documents) {
|
|
batch.del(Database.getKey(collection, document));
|
|
}
|
|
await batch.write();
|
|
batch = undefined;
|
|
await this.database.collections.del(collectionKey);
|
|
this.database.collectionChangeListener.send({
|
|
id: collection,
|
|
key: collectionKey,
|
|
type: "delete"
|
|
});
|
|
}
|
|
} finally {
|
|
if (batch)
|
|
batch.clear();
|
|
}
|
|
}
|
|
|
|
public static fromQuery(query: Query) {
|
|
return new CollectionQuery(...Query.getConstructorParams(query));
|
|
}
|
|
}
|
|
|
|
export class QueryError extends Error {
|
|
constructor(message: string) {
|
|
super(message);
|
|
}
|
|
} |