Quelle nsLocalHandlerApp.cpp Sprache: C

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim:expandtab:shiftwidth=2:tabstop=2:cin:
* 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/. */

#include "nsLocalHandlerApp.h"
#include "nsIURI.h"
#include "nsIProcess.h"
#include "nsComponentManagerUtils.h"
#include "mozilla/dom/Promise.h"
#include "nsProxyRelease.h"

// XXX why does nsMIMEInfoImpl have a threadsafe nsISupports?  do we need one
// here too?
NS_IMPL_ISUPPORTS(nsLocalHandlerApp, nsILocalHandlerApp, nsIHandlerApp)

using namespace mozilla;

////////////////////////////////////////////////////////////////////////////////
//// nsIHandlerApp

NS_IMETHODIMP nsLocalHandlerApp::GetName(nsAString& aName) {
  if (mName.IsEmpty() && mExecutable) {
    // Don't want to cache this, just in case someone resets the app
    // without changing the description....
    mExecutable->GetLeafName(aName);
  } else {
    aName.Assign(mName);
  }

  return NS_OK;
}

/**
* This method returns a std::function that will be executed on a thread other
* than the main thread. To facilitate things, it should effectively be a global
* function that does not maintain a reference to the this pointer. There should
* be no reference to any objects that will be shared across threads. Sub-class
* implementations should make local copies of everything they need and capture
* those in the callback.
*/
std::function<nsresult(nsString&)>
nsLocalHandlerApp::GetPrettyNameOnNonMainThreadCallback() {
  nsString name;

  // Calculate the name now, on the main thread, so as to avoid
  // doing anything with the this pointer on the other thread
  auto result = GetName(name);

  return [name, result](nsString& aName) -> nsresult {
    aName = name;
    return result;
  };
}

NS_IMETHODIMP
nsLocalHandlerApp::PrettyNameAsync(JSContext* aCx, dom::Promise** aPromise) {
  NS_ENSURE_ARG_POINTER(aPromise);

  *aPromise = nullptr;

  if (!mExecutable) {
    return NS_ERROR_FAILURE;
  }

  nsIGlobalObject* global = xpc::CurrentNativeGlobal(aCx);
  if (NS_WARN_IF(!global)) {
    return NS_ERROR_FAILURE;
  }

  ErrorResult err;
  RefPtr<dom::Promise> outer = dom::Promise::Create(global, err);
  if (NS_WARN_IF(err.Failed())) {
    return err.StealNSResult();
  }

  outer.forget(aPromise);

  nsAutoString executablePath;
  nsresult result = mExecutable->GetPath(executablePath);

  if (NS_FAILED(result) || executablePath.IsEmpty()) {
    (*aPromise)->MaybeReject(result);
    return NS_OK;
  }

  nsMainThreadPtrHandle<dom::Promise> promiseHolder(
      new nsMainThreadPtrHolder<dom::Promise>(
          "nsLocalHandlerApp::prettyExecutableName Promise", *aPromise));

  auto prettyNameGetter = GetPrettyNameOnNonMainThreadCallback();

  result = NS_DispatchBackgroundTask(
      NS_NewRunnableFunction(
          __func__,
          [promiseHolder /* can't move this because if the dispatch fails, we
                            call reject on the promiseHolder */
           ,
           prettyNameGetter = std::move(prettyNameGetter)]() mutable -> void {
            nsAutoString prettyExecutableName;

            nsresult result = prettyNameGetter(prettyExecutableName);

            DebugOnly<nsresult> rv =
                NS_DispatchToMainThread(NS_NewRunnableFunction(
                    __func__,
                    [promiseHolder = std::move(promiseHolder),
                     prettyExecutableName = std::move(prettyExecutableName),
                     result]() {
                      if (NS_FAILED(result)) {
                        promiseHolder.get()->MaybeReject(result);
                      } else {
                        promiseHolder.get()->MaybeResolve(prettyExecutableName);
                      }
                    }));
            NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
                                 "NS_DispatchToMainThread failed");
          }),
      NS_DISPATCH_EVENT_MAY_BLOCK);

  if (NS_FAILED(result)) {
    promiseHolder.get()->MaybeReject(result);
  }

  return NS_OK;
}

NS_IMETHODIMP nsLocalHandlerApp::SetName(const nsAString& aName) {
  mName.Assign(aName);

  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::SetDetailedDescription(const nsAString& aDescription) {
  mDetailedDescription.Assign(aDescription);

  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::GetDetailedDescription(nsAString& aDescription) {
  aDescription.Assign(mDetailedDescription);

  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::Equals(nsIHandlerApp* aHandlerApp, bool* _retval) {
  NS_ENSURE_ARG_POINTER(aHandlerApp);

  *_retval = false;

  // If the handler app isn't a local handler app, then it's not the same app.
  nsCOMPtr<nsILocalHandlerApp> localHandlerApp = do_QueryInterface(aHandlerApp);
  if (!localHandlerApp) return NS_OK;

  // If either handler app doesn't have an executable, then they aren't
  // the same app.
  nsCOMPtr<nsIFile> executable;
  nsresult rv = localHandlerApp->GetExecutable(getter_AddRefs(executable));
  if (NS_FAILED(rv)) return rv;

  // Equality for two empty nsIHandlerApp
  if (!executable && !mExecutable) {
    *_retval = true;
    return NS_OK;
  }

  // At least one is set so they are not equal
  if (!mExecutable || !executable) return NS_OK;

  // Check the command line parameter list lengths
  uint32_t len;
  localHandlerApp->GetParameterCount(&len);
  if (mParameters.Length() != len) return NS_OK;

  // Check the command line params lists
  for (uint32_t idx = 0; idx < mParameters.Length(); idx++) {
    nsAutoString param;
    if (NS_FAILED(localHandlerApp->GetParameter(idx, param)) ||
        !param.Equals(mParameters[idx]))
      return NS_OK;
  }

  return executable->Equals(mExecutable, _retval);
}

NS_IMETHODIMP
nsLocalHandlerApp::LaunchWithURI(
    nsIURI* aURI, mozilla::dom::BrowsingContext* aBrowsingContext) {
  // pass the entire URI to the handler.
  nsAutoCString spec;
  aURI->GetAsciiSpec(spec);
  return LaunchWithIProcess(spec);
}

nsresult nsLocalHandlerApp::LaunchWithIProcess(const nsCString& aArg) {
  nsresult rv;
  nsCOMPtr<nsIProcess> process = do_CreateInstance(NS_PROCESS_CONTRACTID, &rv);
  if (NS_FAILED(rv)) return rv;

  if (NS_FAILED(rv = process->Init(mExecutable))) return rv;

  const char* string = aArg.get();

  return process->Run(false, &string, 1);
}

////////////////////////////////////////////////////////////////////////////////
//// nsILocalHandlerApp

NS_IMETHODIMP
nsLocalHandlerApp::GetExecutable(nsIFile** aExecutable) {
  NS_IF_ADDREF(*aExecutable = mExecutable);
  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::SetExecutable(nsIFile* aExecutable) {
  mExecutable = aExecutable;
  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::GetParameterCount(uint32_t* aParameterCount) {
  *aParameterCount = mParameters.Length();
  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::ClearParameters() {
  mParameters.Clear();
  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::AppendParameter(const nsAString& aParam) {
  mParameters.AppendElement(aParam);
  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::GetParameter(uint32_t parameterIndex, nsAString& _retval) {
  if (mParameters.Length() <= parameterIndex) return NS_ERROR_INVALID_ARG;

  _retval.Assign(mParameters[parameterIndex]);
  return NS_OK;
}

NS_IMETHODIMP
nsLocalHandlerApp::ParameterExists(const nsAString& aParam, bool* _retval) {
  *_retval = mParameters.Contains(aParam);
  return NS_OK;
}

quality98%

¤ Dauer der Verarbeitung: 0.25 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.