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Viewing file:     time.js (7.06 KB)      -rw-r--r--

Object.defineProperty(exports, "__esModule", { value: true });
var misc_1 = require("./misc");
var node_1 = require("./node");
/**
 * A TimestampSource implementation for environments that do not support the Performance Web API natively.
 *
 * Note that this TimestampSource does not use a monotonic clock. A call to `nowSeconds` may return a timestamp earlier
 * than a previously returned value. We do not try to emulate a monotonic behavior in order to facilitate debugging. It
 * is more obvious to explain "why does my span have negative duration" than "why my spans have zero duration".
 */
var dateTimestampSource = {
    nowSeconds: function () { return Date.now() / 1000; },
};
/**
 * Returns a wrapper around the native Performance API browser implementation, or undefined for browsers that do not
 * support the API.
 *
 * Wrapping the native API works around differences in behavior from different browsers.
 */
function getBrowserPerformance() {
    var performance = misc_1.getGlobalObject().performance;
    if (!performance || !performance.now) {
        return undefined;
    }
    // Replace performance.timeOrigin with our own timeOrigin based on Date.now().
    //
    // This is a partial workaround for browsers reporting performance.timeOrigin such that performance.timeOrigin +
    // performance.now() gives a date arbitrarily in the past.
    //
    // Additionally, computing timeOrigin in this way fills the gap for browsers where performance.timeOrigin is
    // undefined.
    //
    // The assumption that performance.timeOrigin + performance.now() ~= Date.now() is flawed, but we depend on it to
    // interact with data coming out of performance entries.
    //
    // Note that despite recommendations against it in the spec, browsers implement the Performance API with a clock that
    // might stop when the computer is asleep (and perhaps under other circumstances). Such behavior causes
    // performance.timeOrigin + performance.now() to have an arbitrary skew over Date.now(). In laptop computers, we have
    // observed skews that can be as long as days, weeks or months.
    //
    // See https://github.com/getsentry/sentry-javascript/issues/2590.
    //
    // BUG: despite our best intentions, this workaround has its limitations. It mostly addresses timings of pageload
    // transactions, but ignores the skew built up over time that can aversely affect timestamps of navigation
    // transactions of long-lived web pages.
    var timeOrigin = Date.now() - performance.now();
    return {
        now: function () { return performance.now(); },
        timeOrigin: timeOrigin,
    };
}
/**
 * Returns the native Performance API implementation from Node.js. Returns undefined in old Node.js versions that don't
 * implement the API.
 */
function getNodePerformance() {
    try {
        var perfHooks = node_1.dynamicRequire(module, 'perf_hooks');
        return perfHooks.performance;
    }
    catch (_) {
        return undefined;
    }
}
/**
 * The Performance API implementation for the current platform, if available.
 */
var platformPerformance = node_1.isNodeEnv() ? getNodePerformance() : getBrowserPerformance();
var timestampSource = platformPerformance === undefined
    ? dateTimestampSource
    : {
        nowSeconds: function () { return (platformPerformance.timeOrigin + platformPerformance.now()) / 1000; },
    };
/**
 * Returns a timestamp in seconds since the UNIX epoch using the Date API.
 */
exports.dateTimestampInSeconds = dateTimestampSource.nowSeconds.bind(dateTimestampSource);
/**
 * Returns a timestamp in seconds since the UNIX epoch using either the Performance or Date APIs, depending on the
 * availability of the Performance API.
 *
 * See `usingPerformanceAPI` to test whether the Performance API is used.
 *
 * BUG: Note that because of how browsers implement the Performance API, the clock might stop when the computer is
 * asleep. This creates a skew between `dateTimestampInSeconds` and `timestampInSeconds`. The
 * skew can grow to arbitrary amounts like days, weeks or months.
 * See https://github.com/getsentry/sentry-javascript/issues/2590.
 */
exports.timestampInSeconds = timestampSource.nowSeconds.bind(timestampSource);
// Re-exported with an old name for backwards-compatibility.
exports.timestampWithMs = exports.timestampInSeconds;
/**
 * A boolean that is true when timestampInSeconds uses the Performance API to produce monotonic timestamps.
 */
exports.usingPerformanceAPI = platformPerformance !== undefined;
/**
 * The number of milliseconds since the UNIX epoch. This value is only usable in a browser, and only when the
 * performance API is available.
 */
exports.browserPerformanceTimeOrigin = (function () {
    // Unfortunately browsers may report an inaccurate time origin data, through either performance.timeOrigin or
    // performance.timing.navigationStart, which results in poor results in performance data. We only treat time origin
    // data as reliable if they are within a reasonable threshold of the current time.
    var performance = misc_1.getGlobalObject().performance;
    if (!performance || !performance.now) {
        exports._browserPerformanceTimeOriginMode = 'none';
        return undefined;
    }
    var threshold = 3600 * 1000;
    var performanceNow = performance.now();
    var dateNow = Date.now();
    // if timeOrigin isn't available set delta to threshold so it isn't used
    var timeOriginDelta = performance.timeOrigin
        ? Math.abs(performance.timeOrigin + performanceNow - dateNow)
        : threshold;
    var timeOriginIsReliable = timeOriginDelta < threshold;
    // While performance.timing.navigationStart is deprecated in favor of performance.timeOrigin, performance.timeOrigin
    // is not as widely supported. Namely, performance.timeOrigin is undefined in Safari as of writing.
    // Also as of writing, performance.timing is not available in Web Workers in mainstream browsers, so it is not always
    // a valid fallback. In the absence of an initial time provided by the browser, fallback to the current time from the
    // Date API.
    // eslint-disable-next-line deprecation/deprecation
    var navigationStart = performance.timing && performance.timing.navigationStart;
    var hasNavigationStart = typeof navigationStart === 'number';
    // if navigationStart isn't available set delta to threshold so it isn't used
    var navigationStartDelta = hasNavigationStart ? Math.abs(navigationStart + performanceNow - dateNow) : threshold;
    var navigationStartIsReliable = navigationStartDelta < threshold;
    if (timeOriginIsReliable || navigationStartIsReliable) {
        // Use the more reliable time origin
        if (timeOriginDelta <= navigationStartDelta) {
            exports._browserPerformanceTimeOriginMode = 'timeOrigin';
            return performance.timeOrigin;
        }
        else {
            exports._browserPerformanceTimeOriginMode = 'navigationStart';
            return navigationStart;
        }
    }
    // Either both timeOrigin and navigationStart are skewed or neither is available, fallback to Date.
    exports._browserPerformanceTimeOriginMode = 'dateNow';
    return dateNow;
})();
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