mongo-oplog2/lib/util.js

Simple monitoring of MongoDB oplog.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.timeout = exports.regex = exports.prettify = exports.omit = exports.getTimestamp = exports.getOpName = exports.opMap = void 0;
const util_1 = require("util");
const mongodb_1 = require("mongodb");
util_1.debuglog("mongo-oplog2:utils");
exports.opMap = Object.freeze({
    i: "insert", insert: "i",
    d: "delete", delete: "d",
    n: "noop", noop: "n",
    u: "update", update: "i",
});
/**
 * Converts from the operation code from the native MongoDB versions to
 * friendlier names. Conversions are:
 *   i: insert
 *   d: delete
 *   n: noop
 *   u: update
 * @param op MongoDB operation code
 */
function getOpName(op) {
    return exports.opMap[op] || op;
}
exports.getOpName = getOpName;
/**
 * Converts a number into a MongoDB `Timestamp`
 * @param ts timestamp to convert
 */
function getTimestamp(ts) {
    if (typeof ts === 'string') {
        return mongodb_1.Timestamp.fromString(ts);
    }
    else if (typeof ts === 'number' || !ts) {
        return new mongodb_1.Timestamp(0, ts ? ts : (Date.now() / 1000));
    }
    return ts;
}
exports.getTimestamp = getTimestamp;
/**
 * Returns a new object without any of the specified keys.
 * @param obj Initial object
 * @param keys array of keys to be removed from the object
 */
function omit(obj, keys) {
    const omitted = Object.assign({}, obj);
    for (const key of keys) {
        delete omitted[key];
    }
    return omitted;
}
exports.omit = omit;
/**
 * Converts from `OplogDoc` format to `PrettyOplogDoc` format.
 * @param oplogDoc a document in MongoDB OplogDoc format.
 */
function prettify(oplogDoc) {
    const aEvents = exports.opMap;
    const doc = {
        namespace: oplogDoc.ns,
        operation: getOpName(oplogDoc.op),
        operationId: oplogDoc.h,
        timestamp: new Date(oplogDoc.ts.high_ * 1000),
        ts: oplogDoc.ts,
    };
    const targetId = (oplogDoc.o2 && oplogDoc.o2._id ? oplogDoc.o2._id : (oplogDoc.o && oplogDoc.o._id ? oplogDoc.o._id : null));
    if (targetId) {
        doc.targetId = targetId;
    }
    if (oplogDoc.o2) {
        doc.criteria = oplogDoc.o2;
    }
    if (oplogDoc.o) {
        doc.data = oplogDoc.o;
    }
    return doc;
}
exports.prettify = prettify;
/**
 * Returns a `RegExp` used for filtering events.
 * @param pattern regex pattern
 */
function regex(pattern) {
    pattern = pattern.replace(/[*]/g, "(.*?)");
    return new RegExp(`^${pattern}$`, "i");
}
exports.regex = regex;
/**
 * Returns a promise that will resolve after a specified period of time.
 * @param ms length of time before promise should resolve.
 */
function timeout(ms) {
    return new Promise((resolve) => setTimeout(resolve, ms));
}
exports.timeout = timeout;
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