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import "./MongoBigInt";
import mongoose, { Collection } from "mongoose";
import { ChangeStream, ChangeEvent, Long } from "mongodb";
import EventEmitter from "events";
export default mongoose.connection;
export interface MongooseCache {
on(event: "delete", listener: (id: string) => void): this;
on(event: "change", listener: (data: any) => void): this;
on(event: "insert", listener: (data: any) => void): this;
on(event: "close", listener: () => void): this;
}
export class MongooseCache extends EventEmitter {
public stream: ChangeStream;
public data: any;
constructor(
public collection: Collection,
public pipeline: Array<Record<string, unknown>>,
public opts: {
onlyEvents: boolean;
}
) {
super();
}
async init() {
this.stream = this.collection.watch(this.pipeline, { fullDocument: "updateLookup" });
this.stream.on("change", this.change);
this.stream.on("close", this.destroy);
this.stream.on("error", console.error);
if (!this.opts.onlyEvents) {
const arr = await this.collection.aggregate(this.pipeline).toArray();
this.data = arr.length ? arr[0] : arr;
}
}
convertResult(obj: any) {
if (obj instanceof Long) return BigInt(obj.toString());
if (typeof obj === "object") {
Object.keys(obj).forEach((key) => {
obj[key] = this.convertResult(obj[key]);
});
}
return obj;
}
change = (doc: ChangeEvent) => {
// @ts-ignore
if (doc.fullDocument) {
// @ts-ignore
if (!this.opts.onlyEvents) this.data = doc.fullDocument;
}
switch (doc.operationType) {
case "dropDatabase":
return this.destroy();
case "drop":
return this.destroy();
case "delete":
return this.emit("delete", doc.documentKey._id.toHexString());
case "insert":
return this.emit("insert", doc.fullDocument);
case "update":
case "replace":
return this.emit("change", doc.fullDocument);
case "invalidate":
return this.destroy();
default:
return;
}
};
destroy() {
this.stream.off("change", this.change);
this.emit("close");
if (this.stream.isClosed()) return;
return this.stream.close();
}
}
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