mongo-oplog2/lib/filter.js

Simple monitoring of MongoDB oplog.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.FilteredMongoOplog = void 0;
const util_1 = require("util");
const eventemitter_1 = require("./eventemitter");
const util_2 = require("./util");
const debug = util_1.debuglog("mongo-oplog2:filter");
/**
 * Allows filtering of the oplog events. A typical usecase would be to have the
 * main `oplog` instance tailing an entire database but then create a filter for
 * a specifc collection to create triggers independently.
 */
class FilteredMongoOplog extends eventemitter_1.default {
    constructor(oplog, ns = "*") {
        super();
        this.ignore = false;
        debug("initializing filter with re %s", ns);
        const re = util_2.regex(ns);
        this.oplog = oplog;
        this.onOp = (doc) => {
            const docNs = doc.namespace || doc.ns;
            if (this.ignore || !re.test(docNs)) {
                return;
            }
            debug("incoming data %j", doc);
            const opName = doc.operation || util_2.getOpName(doc.op);
            this.emit("op", doc);
            this.emit(opName, doc);
        };
        oplog.on("op", this.onOp);
    }
    /**
     * Removes the filter from the listeners for the oplog instance and
     * removes all event listeners from the filter.
     */
    destroy() {
        debug("removing filter bindings");
        this.emit("destroy");
        this.oplog.removeListener("op", this.onOp);
        this.removeAllListeners();
    }
}
exports.FilteredMongoOplog = FilteredMongoOplog;
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