86 lines
2.6 KiB
JavaScript
86 lines
2.6 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/**
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* @typedef {import("perf").BulkReceiving} BulkReceiving
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*/
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const {
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FrontClassWithSpec,
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registerFront,
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} = require("resource://devtools/shared/protocol.js");
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const { perfSpec } = require("resource://devtools/shared/specs/perf.js");
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class PerfFront extends FrontClassWithSpec(perfSpec) {
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constructor(client, targetFront, parentFront) {
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super(client, targetFront, parentFront);
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// Attribute name from which to retrieve the actorID out of the target actor's form
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this.formAttributeName = "perfActor";
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}
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async getProfileAndStopProfiler() {
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const handle = await this.startCaptureAndStopProfiler();
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// Start both calls in parallel
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const profilePromise = this.getPreviouslyCapturedProfileDataBulk(handle);
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const additionalInformationPromise =
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this.getPreviouslyRetrievedAdditionalInformation(handle);
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// But make sure we wait until the end of both calls even in case of an error.
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const [profileResult, additionalInformationResult] =
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await Promise.allSettled([profilePromise, additionalInformationPromise]);
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if (profileResult.status === "rejected") {
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throw profileResult.reason;
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}
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if (additionalInformationResult.status === "rejected") {
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throw additionalInformationResult.reason;
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}
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return {
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profile: profileResult.value,
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additionalInformation: additionalInformationResult.value,
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};
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}
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/**
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* This implements the retrieval of the profile data using the bulk protocol.
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*
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* @param {number} handle THe handle returned by startCaptureAndStopProfiler
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*/
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async getPreviouslyCapturedProfileDataBulk(handle) {
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/**
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* @typedef {BulkReceiving}
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*/
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const profileResult = await super.getPreviouslyCapturedProfileDataBulk(
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handle
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);
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if (!profileResult) {
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throw new Error(
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"this.conn.request returns null or undefined, this is unexpected."
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);
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}
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if (!profileResult.length) {
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throw new Error(
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"The profile result is an empty buffer, this is unexpected."
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);
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}
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// We need to copy the data out of the stream we get using the bulk API.
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// Note that the profile data is gzipped, but the profiler's frontend code
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// knows how to deal with it.
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const buffer = new ArrayBuffer(profileResult.length);
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await profileResult.copyToBuffer(buffer);
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return buffer;
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}
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}
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registerFront(PerfFront);
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