/* 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/. */

import { GeckoViewUtils } from "resource://gre/modules/GeckoViewUtils.sys.mjs";
import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";

const lazy = {};

ChromeUtils.defineESModuleGetters(lazy, {
  EventDispatcher: "resource://gre/modules/Messaging.sys.mjs",
});

const { debug, warn } = GeckoViewUtils.initLogging("ChildCrashHandler");

function getDir(name) {
  const uAppDataPath = Services.dirsvc.get("UAppData", Ci.nsIFile).path;
  return PathUtils.join(uAppDataPath, "Crash Reports", name);
}

function getPendingMinidump(id) {
  const pendingDir = getDir("pending");

  return [".dmp", ".extra"].map(suffix => {
    return PathUtils.join(pendingDir, `${id}${suffix}`);
  });
}

export var ChildCrashHandler = {
  // The event listener for this is hooked up in GeckoViewStartup.jsm
  observe(aSubject, aTopic, aData) {
    if (
      aTopic !== "ipc:content-shutdown" &&
      aTopic !== "compositor:process-aborted"
    ) {
      return;
    }

    aSubject.QueryInterface(Ci.nsIPropertyBag2);

    const disableReporting = Services.env.get("MOZ_CRASHREPORTER_NO_REPORT");

    if (
      !aSubject.get("abnormal") ||
      !AppConstants.MOZ_CRASHREPORTER ||
      disableReporting
    ) {
      return;
    }

    // If dumpID is empty the process was likely killed by the system and we therefore do not want
    // to report the crash.
    const dumpID = aSubject.get("dumpID");
    if (!dumpID) {
      Services.telemetry
        .getHistogramById("FX_CONTENT_CRASH_DUMP_UNAVAILABLE")
        .add(1);
      return;
    }

    debug`Notifying child process crash, dump ID ${dumpID}`;
    const [minidumpPath, extrasPath] = getPendingMinidump(dumpID);

    // Report GPU process crashes as occuring in a background process, and others as foreground.
    const processType =
      aTopic === "compositor:process-aborted"
        ? "BACKGROUND_CHILD"
        : "FOREGROUND_CHILD";

    lazy.EventDispatcher.instance.sendRequest({
      type: "GeckoView:ChildCrashReport",
      minidumpPath,
      extrasPath,
      success: true,
      fatal: false,
      processType,
    });
  },
};