import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/system/gonk/MozMtpServer.cpp

@@ -0,0 +1,263 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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 "MozMtpServer.h"
+#include "MozMtpDatabase.h"
+
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <cutils/properties.h>
+#include <private/android_filesystem_config.h>
+
+#include "base/message_loop.h"
+#include "DeviceStorage.h"
+#include "mozilla/LazyIdleThread.h"
+#include "mozilla/Scoped.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPtr.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsISupportsImpl.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+
+#include "Volume.h"
+
+#define DEFAULT_THREAD_TIMEOUT_MS 30000
+
+using namespace android;
+using namespace mozilla;
+BEGIN_MTP_NAMESPACE
+
+static const char* kMtpWatcherUpdate = "mtp-watcher-update";
+
+class MtpWatcherUpdateRunnable final : public Runnable
+{
+public:
+  MtpWatcherUpdateRunnable(MozMtpDatabase* aMozMtpDatabase,
+                           RefCountedMtpServer* aMtpServer,
+                           DeviceStorageFile* aFile,
+                           const nsACString& aEventType)
+    : mMozMtpDatabase(aMozMtpDatabase),
+      mMtpServer(aMtpServer),
+      mFile(aFile),
+      mEventType(aEventType)
+  {}
+
+  NS_IMETHOD Run() override
+  {
+    // Runs on the MtpWatcherUpdate->mIOThread
+    MOZ_ASSERT(!NS_IsMainThread());
+
+    mMozMtpDatabase->MtpWatcherUpdate(mMtpServer, mFile, mEventType);
+    return NS_OK;
+  }
+
+private:
+  RefPtr<MozMtpDatabase> mMozMtpDatabase;
+  RefPtr<RefCountedMtpServer> mMtpServer;
+  RefPtr<DeviceStorageFile> mFile;
+  nsCString mEventType;
+};
+
+// The MtpWatcherUpdate class listens for mtp-watcher-update events
+// and tells the MtpServer about changes made in device storage.
+class MtpWatcherUpdate final : public nsIObserver
+{
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  MtpWatcherUpdate(MozMtpServer* aMozMtpServer)
+    : mMozMtpServer(aMozMtpServer)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    mIOThread = new LazyIdleThread(
+      DEFAULT_THREAD_TIMEOUT_MS,
+      NS_LITERAL_CSTRING("MtpWatcherUpdate"));
+
+    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+    obs->AddObserver(this, kMtpWatcherUpdate, false);
+  }
+
+  NS_IMETHOD
+  Observe(nsISupports* aSubject, const char* aTopic, const char16_t* aData)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    if (strcmp(aTopic, kMtpWatcherUpdate)) {
+      // We're only interested in mtp-watcher-update events
+      return NS_OK;
+    }
+
+    NS_ConvertUTF16toUTF8 eventType(aData);
+    if (!eventType.EqualsLiteral("modified") && !eventType.EqualsLiteral("deleted")) {
+      // Bug 1074604: Needn't handle "created" event, once file operation
+      // finished, it would trigger "modified" event.
+      return NS_OK;
+    }
+
+    DeviceStorageFile* file = static_cast<DeviceStorageFile*>(aSubject);
+    file->Dump(kMtpWatcherUpdate);
+    MTP_LOG("%s: file %s %s", kMtpWatcherUpdate,
+            NS_LossyConvertUTF16toASCII(file->mPath).get(),
+            eventType.get());
+
+    RefPtr<MozMtpDatabase> mozMtpDatabase = mMozMtpServer->GetMozMtpDatabase();
+    RefPtr<RefCountedMtpServer> mtpServer = mMozMtpServer->GetMtpServer();
+
+    // We're not supposed to perform I/O on the main thread, so punt the
+    // notification (which will write to /dev/mtp_usb) to an I/O Thread.
+
+    RefPtr<MtpWatcherUpdateRunnable> r =
+      new MtpWatcherUpdateRunnable(mozMtpDatabase, mtpServer, file, eventType);
+    mIOThread->Dispatch(r, NS_DISPATCH_NORMAL);
+
+    return NS_OK;
+  }
+
+protected:
+  ~MtpWatcherUpdate()
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+    obs->RemoveObserver(this, kMtpWatcherUpdate);
+  }
+
+private:
+  RefPtr<MozMtpServer> mMozMtpServer;
+  nsCOMPtr<nsIThread> mIOThread;
+};
+NS_IMPL_ISUPPORTS(MtpWatcherUpdate, nsIObserver)
+static StaticRefPtr<MtpWatcherUpdate> sMtpWatcherUpdate;
+
+class AllocMtpWatcherUpdateRunnable final : public Runnable
+{
+public:
+  AllocMtpWatcherUpdateRunnable(MozMtpServer* aMozMtpServer)
+    : mMozMtpServer(aMozMtpServer)
+  {}
+
+  NS_IMETHOD Run() override
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    sMtpWatcherUpdate = new MtpWatcherUpdate(mMozMtpServer);
+    return NS_OK;
+  }
+private:
+  RefPtr<MozMtpServer> mMozMtpServer;
+};
+
+class FreeMtpWatcherUpdateRunnable final : public Runnable
+{
+public:
+  FreeMtpWatcherUpdateRunnable(MozMtpServer* aMozMtpServer)
+    : mMozMtpServer(aMozMtpServer)
+  {}
+
+  NS_IMETHOD Run() override
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    sMtpWatcherUpdate = nullptr;
+    return NS_OK;
+  }
+private:
+  RefPtr<MozMtpServer> mMozMtpServer;
+};
+
+class MtpServerRunnable : public Runnable
+{
+public:
+  MtpServerRunnable(int aMtpUsbFd, MozMtpServer* aMozMtpServer)
+    : mMozMtpServer(aMozMtpServer),
+      mMtpUsbFd(aMtpUsbFd)
+  {
+  }
+
+  nsresult Run()
+  {
+    RefPtr<RefCountedMtpServer> server = mMozMtpServer->GetMtpServer();
+
+    DebugOnly<nsresult> rv =
+      NS_DispatchToMainThread(new AllocMtpWatcherUpdateRunnable(mMozMtpServer));
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+    MTP_LOG("MozMtpServer started");
+    server->run();
+    MTP_LOG("MozMtpServer finished");
+
+    // server->run will have closed the file descriptor.
+    mMtpUsbFd.forget();
+
+    rv = NS_DispatchToMainThread(new FreeMtpWatcherUpdateRunnable(mMozMtpServer));
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+    return NS_OK;
+  }
+
+private:
+  RefPtr<MozMtpServer> mMozMtpServer;
+  ScopedClose mMtpUsbFd; // We want to hold this open while the server runs
+};
+
+already_AddRefed<RefCountedMtpServer>
+MozMtpServer::GetMtpServer()
+{
+  RefPtr<RefCountedMtpServer> server = mMtpServer;
+  return server.forget();
+}
+
+already_AddRefed<MozMtpDatabase>
+MozMtpServer::GetMozMtpDatabase()
+{
+  RefPtr<MozMtpDatabase> db = mMozMtpDatabase;
+  return db.forget();
+}
+
+bool
+MozMtpServer::Init()
+{
+  MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
+
+  const char *mtpUsbFilename = "/dev/mtp_usb";
+  mMtpUsbFd = open(mtpUsbFilename, O_RDWR);
+  if (mMtpUsbFd.get() < 0) {
+    MTP_ERR("open of '%s' failed((%s))", mtpUsbFilename, strerror(errno));
+    return false;
+  }
+  MTP_LOG("Opened '%s' fd %d", mtpUsbFilename, mMtpUsbFd.get());
+
+  mMozMtpDatabase = new MozMtpDatabase();
+  mMtpServer = new RefCountedMtpServer(mMtpUsbFd.get(),        // fd
+                                       mMozMtpDatabase.get(), // MtpDatabase
+                                       false,                 // ptp?
+                                       AID_MEDIA_RW,          // file group
+                                       0664,                  // file permissions
+                                       0775);                 // dir permissions
+  return true;
+}
+
+void
+MozMtpServer::Run()
+{
+  nsresult rv = NS_NewNamedThread("MtpServer", getter_AddRefs(mServerThread));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+  MOZ_ASSERT(mServerThread);
+  mServerThread->Dispatch(new MtpServerRunnable(mMtpUsbFd.forget(), this), NS_DISPATCH_NORMAL);
+}
+
+END_MTP_NAMESPACE