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import * as mongodb from 'mongodb';
import { Transferable } from './Message';
export class Database {
public static DocumentsCollection = 'documents';
public static Instance = new Database();
private MongoClient = mongodb.MongoClient;
private url = 'mongodb://localhost:27017/Dash';
private currentWrites: { [id: string]: Promise<void> } = {};
private db?: mongodb.Db;
private onConnect: (() => void)[] = [];
constructor() {
this.MongoClient.connect(this.url, (err, client) => {
this.db = client.db();
this.onConnect.forEach(fn => fn());
});
}
public update(id: string, value: any, callback: () => void, upsert = true, collectionName = Database.DocumentsCollection) {
if (this.db) {
let collection = this.db.collection(collectionName);
const prom = this.currentWrites[id];
let newProm: Promise<void>;
const run = (): Promise<void> => {
return new Promise<void>(resolve => {
collection.updateOne({ _id: id }, value, { upsert }
, (err, res) => {
if (this.currentWrites[id] === newProm) {
delete this.currentWrites[id];
}
resolve();
callback();
});
});
};
newProm = prom ? prom.then(run) : run();
this.currentWrites[id] = newProm;
} else {
this.onConnect.push(() => this.update(id, value, callback, upsert, collectionName));
}
}
public delete(query: any, collectionName?: string): Promise<mongodb.DeleteWriteOpResultObject>;
public delete(id: string, collectionName?: string): Promise<mongodb.DeleteWriteOpResultObject>;
public delete(id: any, collectionName = Database.DocumentsCollection) {
if (typeof id === "string") {
id = { _id: id };
}
if (this.db) {
const db = this.db;
return new Promise(res => db.collection(collectionName).deleteMany(id, (err, result) => res(result)));
} else {
return new Promise(res => this.onConnect.push(() => res(this.delete(id, collectionName))));
}
}
public deleteAll(collectionName = Database.DocumentsCollection): Promise<any> {
return new Promise(res => {
if (this.db) {
this.db.collection(collectionName).deleteMany({}, res);
} else {
this.onConnect.push(() => this.db && this.db.collection(collectionName).deleteMany({}, res));
}
});
}
public insert(value: any, collectionName = Database.DocumentsCollection) {
if (this.db) {
if ("id" in value) {
value._id = value.id;
delete value.id;
}
const id = value._id;
const collection = this.db.collection(collectionName);
const prom = this.currentWrites[id];
let newProm: Promise<void>;
const run = (): Promise<void> => {
return new Promise<void>(resolve => {
collection.insertOne(value, (err, res) => {
if (this.currentWrites[id] === newProm) {
delete this.currentWrites[id];
}
resolve();
});
});
};
newProm = prom ? prom.then(run) : run();
this.currentWrites[id] = newProm;
} else {
this.onConnect.push(() => this.insert(value, collectionName));
}
}
public getDocument(id: string, fn: (result?: Transferable) => void, collectionName = Database.DocumentsCollection) {
if (this.db) {
this.db.collection(collectionName).findOne({ _id: id }, (err, result) => {
if (result) {
result.id = result._id;
delete result._id;
fn(result);
} else {
fn(undefined);
}
});
} else {
this.onConnect.push(() => this.getDocument(id, fn, collectionName));
}
}
public getDocuments(ids: string[], fn: (result: Transferable[]) => void, collectionName = Database.DocumentsCollection) {
if (this.db) {
this.db.collection(collectionName).find({ _id: { "$in": ids } }).toArray((err, docs) => {
if (err) {
console.log(err.message);
console.log(err.errmsg);
}
fn(docs.map(doc => {
doc.id = doc._id;
delete doc._id;
return doc;
}));
});
} else {
this.onConnect.push(() => this.getDocuments(ids, fn, collectionName));
}
}
public query(query: { [key: string]: any }, projection?: { [key: string]: 0 | 1 }, collectionName = "newDocuments"): Promise<mongodb.Cursor> {
if (this.db) {
let cursor = this.db.collection(collectionName).find(query);
if (projection) {
cursor = cursor.project(projection);
}
return Promise.resolve<mongodb.Cursor>(cursor);
} else {
return new Promise<mongodb.Cursor>(res => {
this.onConnect.push(() => res(this.query(query, projection, collectionName)));
});
}
}
public updateMany(query: any, update: any, collectionName = "newDocuments") {
if (this.db) {
const db = this.db;
return new Promise<mongodb.WriteOpResult>(res => db.collection(collectionName).update(query, update, (_, result) => res(result)));
} else {
return new Promise<mongodb.WriteOpResult>(res => {
this.onConnect.push(() => this.updateMany(query, update, collectionName).then(res));
});
}
}
public print() {
console.log("db says hi!");
}
}
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