mongo-oplog2/lib/stream.js

Simple monitoring of MongoDB oplog.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getLastDoc = exports.getStream = void 0;
const util_1 = require("./util");
/**
 * Obtain a cursor stream for the oplog.
 * @param db database connection
 * @param ns optional namespace for filtering of documents returned
 * @param ts timestamp to start from. No specified timestamp is treated as from now.
 * @param coll collection for the oplog. (default: "oplog.rs")
 */
async function getStream({ db, ns, ts, coll, filter } = {}) {
    if (!db) {
        throw new Error("Mongo db is missing.");
    }
    coll = coll || "oplog.rs";
    const collection = db.collection(coll);
    const timestamp = util_1.getTimestamp(ts);
    const query = { ts: { $gt: timestamp } };
    if (filter) {
        Object.assign(query, filter);
    }
    else if (ns) {
        query.ns = { $regex: util_1.regex(ns) };
    }
    const cursor = collection.find(query);
    for (const flag of ['awaitData', 'noCursorTimeout', 'oplogReplay', 'tailable']) {
        cursor.addCursorFlag(flag, true);
    }
    cursor.setCursorOption('numberOfRetries', Number.MAX_VALUE);
    cursor.batchSize(1000);
    return cursor.stream();
}
exports.getStream = getStream;
/**
 * Retrieves the last document from the capped collection.
 * @param db database connection
 * @param ns optional namespace for filtering of ducoments returned
 * @param coll collection to query (default: "oplog.rs")
 */
async function getLastDoc(db, ns, coll) {
    if (!db) {
        throw new Error("MongoDB connection is missing.");
    }
    coll = coll || "oplog.rs";
    const collection = db.collection(coll);
    const query = ns ? { ns: { $regex: util_1.regex(ns) } } : {};
    const cursor = collection.find(query).sort({ $natural: -1 }).limit(1);
    const doc = await cursor.next();
    return doc;
}
exports.getLastDoc = getLastDoc;
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