gdata: Add GDataFileSystem::GetFileInfoByPathAsync().

chrome/browser/chromeos/gdata/gdata_file_system.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/gdata/gdata_file_system.h"
 
 #include <errno.h>
 #include <sys/stat.h>
 
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/chromeos/chromeos_version.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
 #include "base/platform_file.h"
 #include "base/sys_info.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/values.h"
+#include "chrome/browser/chromeos/gdata/gdata.pb.h"
 #include "chrome/browser/chromeos/gdata/gdata_documents_service.h"
 #include "chrome/browser/chromeos/gdata/gdata_download_observer.h"
 #include "chrome/browser/chromeos/gdata/gdata_protocol_handler.h"
 #include "chrome/browser/chromeos/gdata/gdata_sync_client.h"
 #include "chrome/browser/chromeos/gdata/gdata_system_service.h"
 #include "chrome/browser/chromeos/gdata/gdata_upload_file_info.h"
 #include "chrome/browser/chromeos/gdata/gdata_util.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_constants.h"
@@ skipping 761 matching lines @@
 // Ditto for SetMountedStateCallback.
 void RelaySetMountedStateCallback(
     scoped_refptr<base::MessageLoopProxy> relay_proxy,
     const SetMountedStateCallback& callback,
     base::PlatformFileError error,
     const FilePath& file_path) {
   relay_proxy->PostTask(FROM_HERE,
                         base::Bind(callback, error, file_path));
 }
 
+// Ditto for GetFileInfoCallback.
+void RelayGetFileInfoCallback(
+    scoped_refptr<base::MessageLoopProxy> relay_proxy,
+    const GetFileInfoCallback& callback,
+    base::PlatformFileError error,
+    scoped_ptr<GDataFileProto> file_proto) {
+  relay_proxy->PostTask(
+      FROM_HERE,
+      base::Bind(callback, error, base::Passed(&file_proto)));
+}
+
 }  // namespace
 
 // GDataFileProperties struct implementation.
 
 GDataFileProperties::GDataFileProperties() : is_hosted_document(false) {
 }
 
 GDataFileProperties::~GDataFileProperties() {
 }
 
@@ skipping 1276 matching lines @@
 }
 
 void GDataFileSystem::ResumeUpload(
     const ResumeUploadParams& params,
     const ResumeFileUploadCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   documents_service_->ResumeUpload(params, callback);
 }
 
+void GDataFileSystem::GetFileInfoByPathAsync(
+    const FilePath& file_path,
+    const GetFileInfoCallback& callback) {
+  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+    const bool posted = BrowserThread::PostTask(
+        BrowserThread::UI,
+        FROM_HERE,
+        base::Bind(&GDataFileSystem::GetFileInfoByPathAsync,
+                   ui_weak_ptr_,
+                   file_path,
+                   base::Bind(&RelayGetFileInfoCallback,
+                              base::MessageLoopProxy::current(),
+                              callback)));
+    DCHECK(posted);
+    return;
+  }
+
+  GetFileInfoByPathAsyncOnUIThread(file_path, callback);
+}
+
+void GDataFileSystem::GetFileInfoByPathAsyncOnUIThread(
+    const FilePath& file_path,
+    const GetFileInfoCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  FindEntryByPathAsyncOnUIThread(
+      file_path,
+      base::Bind(&GDataFileSystem::OnEntryFound,
+                 ui_weak_ptr_,
+                 callback));
+}
+
+void GDataFileSystem::OnEntryFound(const GetFileInfoCallback& callback,
+                                   base::PlatformFileError error,
+                                   const FilePath& directory_path,
+                                   GDataEntry* entry) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  if (error != base::PLATFORM_FILE_OK) {
+    if (!callback.is_null())
+      callback.Run(error, scoped_ptr<GDataFileProto>());
+    return;
+  }
+
+  GDataFile* file = entry->AsGDataFile();
+  if (!file) {
+    if (!callback.is_null())
+      callback.Run(base::PLATFORM_FILE_ERROR_NOT_FOUND,
+                   scoped_ptr<GDataFileProto>());
+    return;
+  }
+
+  scoped_ptr<GDataFileProto> file_proto(new GDataFileProto);
+  file->ToProto(file_proto.get());
+
+  if (!callback.is_null())
+    callback.Run(base::PLATFORM_FILE_OK, file_proto.Pass());
+}
+
 bool GDataFileSystem::GetFileInfoByPath(
     const FilePath& file_path, GDataFileProperties* properties) {
   DCHECK(properties);
   base::AutoLock lock(lock_);
   GDataEntry* entry = GetGDataEntryByPath(file_path);
   if (!entry)
     return false;
 
   properties->file_info = entry->file_info();
   properties->resource_id = entry->resource_id();
@@ skipping 2455 matching lines @@
   pref_registrar_->Init(profile_->GetPrefs());
   pref_registrar_->Add(prefs::kDisableGDataHostedFiles, this);
 }
 
 void SetFreeDiskSpaceGetterForTesting(FreeDiskSpaceGetterInterface* getter) {
   delete global_free_disk_getter_for_testing;  // Safe to delete NULL;
   global_free_disk_getter_for_testing = getter;
 }
 
 }  // namespace gdata