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events.js
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129 lines (109 loc) · 3.09 KB
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
// @flow
import type {
SourcePacket,
ResumedPacket,
PausedPacket,
ThreadClient,
Actions
} from "./types";
import { createPause, createSource } from "./create";
import sourceQueue from "../../utils/source-queue";
const CALL_STACK_PAGE_SIZE = 1000;
type Dependencies = {
threadClient: ThreadClient,
actions: Actions,
supportsWasm: boolean
};
let actions: Actions;
let supportsWasm: boolean;
let isInterrupted: boolean;
function addThreadEventListeners(client: ThreadClient) {
Object.keys(clientEvents).forEach(eventName => {
client.addListener(eventName, clientEvents[eventName].bind(null, client));
});
}
function setupEvents(dependencies: Dependencies) {
const threadClient = dependencies.threadClient;
actions = dependencies.actions;
supportsWasm = dependencies.supportsWasm;
sourceQueue.initialize(actions);
if (threadClient) {
addThreadEventListeners(threadClient);
if (threadClient._parent) {
// Parent may be BrowsingContextTargetFront/WorkerTargetFront and
// be protocol.js. Or DebuggerClient and still be old fashion actor.
if (threadClient._parent.on) {
threadClient._parent.on("workerListChanged", workerListChanged);
} else {
threadClient._parent.addListener(
"workerListChanged",
workerListChanged
);
}
}
}
}
async function paused(
threadClient: ThreadClient,
_: "paused",
packet: PausedPacket
) {
// If paused by an explicit interrupt, which are generated by the
// slow script dialog and internal events such as setting
// breakpoints, ignore the event.
const { why } = packet;
if (why.type === "interrupted" && !packet.why.onNext) {
isInterrupted = true;
return;
}
let response;
try {
// Eagerly fetch the frames
response = await threadClient.getFrames(0, CALL_STACK_PAGE_SIZE);
} catch (e) {
console.log(e);
return;
}
// NOTE: this happens if we fetch frames and then immediately navigate
if (!response.hasOwnProperty("frames")) {
return;
}
if (why.type != "alreadyPaused") {
const pause = createPause(threadClient.actor, packet, response);
await sourceQueue.flush();
actions.paused(pause);
}
}
function resumed(
threadClient: ThreadClient,
_: "resumed",
packet: ResumedPacket
) {
// NOTE: the client suppresses resumed events while interrupted
// to prevent unintentional behavior.
// see [client docs](../README.md#interrupted) for more information.
if (isInterrupted) {
isInterrupted = false;
return;
}
actions.resumed(packet);
}
function newSource(
threadClient: ThreadClient,
_: "newSource",
{ source }: SourcePacket
) {
sourceQueue.queue(createSource(threadClient.actor, source, { supportsWasm }));
}
function workerListChanged() {
actions.updateWorkers();
}
const clientEvents = {
paused,
resumed,
newSource
};
export { setupEvents, clientEvents, addThreadEventListeners };