@elastic/synthetics
Version:
Elastic synthetic monitoring agent
74 lines • 3.5 kB
JavaScript
;
/**
* MIT License
*
* Copyright (c) 2020-present, Elastic NV
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.TraceProcessor = void 0;
const lh_trace_processor_1 = __importDefault(require("./lh-trace-processor"));
const trace_metrics_1 = require("./trace-metrics");
const logger_1 = require("../core/logger");
const ACCEPTABLE_NAVIGATION_URL_REGEX = /^(file|https?):/;
/**
* Extends the lighthouse trace processor which extracts all the meaningful trace
* events in chronological order from the tab's process
*
* We extend Lighthouse Processor instead of calling it directy as we want to control
* what is the interest event for Navigation start and also in future we want to measure
* metrics based on multiple navigations instead of a single navigation.
*/
class TraceProcessor extends lh_trace_processor_1.default {
static _isNavigationStartOfInterest(event) {
return (event.name === 'navigationStart' &&
(!event.args.data ||
!event.args.data.documentLoaderURL ||
ACCEPTABLE_NAVIGATION_URL_REGEX.test(event.args.data.documentLoaderURL)));
}
static computeTrace(traceEvents) {
// Origin of the trace is based on the last navigation event
const options = {
timeOriginDeterminationMethod: 'lastNavigationStart',
};
try {
const processedTrace = this.processTrace({ traceEvents }, options);
const processedNavigation = this.processNavigation(processedTrace);
const userTiming = trace_metrics_1.UserTimings.compute(processedTrace);
const { traces: expTraces, metrics } = trace_metrics_1.ExperienceMetrics.compute(processedNavigation);
const { cls, traces: layoutTraces } = trace_metrics_1.CumulativeLayoutShift.compute(processedTrace);
const perfMetrics = { cls, ...metrics };
return {
traces: userTiming.concat(expTraces, layoutTraces),
metrics: perfMetrics,
};
}
catch (e) {
(0, logger_1.log)(`Plugins: error processing trace events: ${e}`);
return {};
}
}
}
exports.TraceProcessor = TraceProcessor;
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