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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/. */
"use strict";
const {
TYPES: { TRACING_STATE },
} = require("resource://devtools/server/actors/resources/index.js");
// Bug 1827382, as this module can be used from the worker thread,
// the following JSM may be loaded by the worker loader until
// we have proper support for ESM from workers.
const {
addTracingListener,
removeTracingListener,
} = require("resource://devtools/server/tracer/tracer.jsm");
class TracingStateWatcher {
/**
* Start watching for tracing state changes for a given target actor.
*
* @param TargetActor targetActor
* The target actor from which we should observe
* @param Object options
* Dictionary object with following attributes:
* - onAvailable: mandatory function
* This will be called for each resource.
*/
async watch(targetActor, { onAvailable }) {
this.targetActor = targetActor;
this.onAvailable = onAvailable;
this.tracingListener = {
onTracingToggled: this.onTracingToggled.bind(this),
};
addTracingListener(this.tracingListener);
}
/**
* Stop watching for tracing state
*/
destroy() {
removeTracingListener(this.tracingListener);
}
// Emit a TRACING_STATE resource with:
// enabled = true|false
// When Javascript tracing is enabled or disabled.
onTracingToggled(enabled) {
const tracerActor = this.targetActor.getTargetScopedActor("tracer");
const logMethod = tracerActor?.getLogMethod() | "stdout";
this.onAvailable([
{
resourceType: TRACING_STATE,
enabled,
logMethod,
},
]);
}
}
module.exports = TracingStateWatcher;
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