[FileSystem] Add another copy-or-move validation hook for post-write.

webkit/browser/fileapi/copy_or_move_operation_delegate.cc

 // Copyright (c) 2013 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 "webkit/browser/fileapi/copy_or_move_operation_delegate.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "webkit/browser/fileapi/copy_or_move_file_validator.h"
 #include "webkit/browser/fileapi/file_system_context.h"
@@ skipping 93 matching lines @@
     callback_.Run(error);
     return;
   }
 
   // Start to process the source directory recursively.
   // TODO(kinuko): This could be too expensive for same_file_system_==true
   // and operation==MOVE case, probably we can just rename the root directory.
   // http://crbug.com/172187
   StartRecursiveOperation(
       src_root_, base::Bind(&CopyOrMoveOperationDelegate::DidFinishCopy,
-                            AsWeakPtr(), src_root_, callback_));
+                            AsWeakPtr(), URLPair(src_root_, dest_root_),
+                            callback_));
 }
 
 void CopyOrMoveOperationDelegate::CopyOrMoveFile(const URLPair& url_pair,
                                             const StatusCallback& callback) {
   // Same filesystem case.
   if (same_file_system_) {
     if (operation_type_ == OPERATION_MOVE) {
       operation_runner()->MoveFileLocal(url_pair.src, url_pair.dest, callback);
     } else {
       operation_runner()->CopyFileLocal(url_pair.src, url_pair.dest, callback);
     }
     return;
   }
 
   // Cross filesystem case.
   // Perform CreateSnapshotFile, CopyInForeignFile and then calls
   // copy_callback which removes the source file if operation_type == MOVE.
   StatusCallback copy_callback =
       base::Bind(&CopyOrMoveOperationDelegate::DidFinishCopy, AsWeakPtr(),
-                 url_pair.src, callback);
+                 url_pair, callback);
   operation_runner()->CreateSnapshotFile(
       url_pair.src,
       base::Bind(&CopyOrMoveOperationDelegate::DidCreateSnapshot, AsWeakPtr(),
                  url_pair, copy_callback));
 }
 
 void CopyOrMoveOperationDelegate::DidCreateSnapshot(
     const URLPair& url_pair,
     const StatusCallback& callback,
     base::PlatformFileError error,
@@ skipping 37 matching lines @@
     base::PlatformFileError error) {
   if (error != base::PLATFORM_FILE_OK) {
     callback.Run(error);
     return;
   }
 
   operation_runner()->CopyInForeignFile(platform_path, dest, callback);
 }
 
 void CopyOrMoveOperationDelegate::DidFinishCopy(
-    const FileSystemURL& src,
+    const URLPair& url_pair,
     const StatusCallback& callback,
     base::PlatformFileError error) {
-  if (error != base::PLATFORM_FILE_OK ||
-      operation_type_ == OPERATION_COPY) {
+  if (error != base::PLATFORM_FILE_OK) {
     callback.Run(error);
     return;
   }
+
+  if (validator_.get()) {

[kinuko, 2013/07/04 03:10:12]

nit: Can you add a comment here to clarify that validator_ must not exist if
it's same-filesystem case? (Also maybe we could add DCHECK(!same_file_system_)
here)

Also it's very minor preferential issue, but can we swap this if/else like
following so that the code flow looks similar to DidCreateSnapshot:

if (!validator_.get()) {
  DidPostWriteValidation(...);
  return;
}

operation_runner()->CreateSnapshotFile(...);

[Greg Billock, 2013/07/08 20:01:53]

Done.
Sure thing. Done.

+    operation_runner()->CreateSnapshotFile(
+        url_pair.dest,
+        base::Bind(&CopyOrMoveOperationDelegate::DoPostWriteValidation,
+                   AsWeakPtr(), url_pair, callback));
+  } else {
+    DidPostWriteValidation(url_pair, callback, base::PLATFORM_FILE_OK);
+  }
+}
+
+void CopyOrMoveOperationDelegate::DoPostWriteValidation(
+    const URLPair& url_pair,
+    const StatusCallback& callback,
+    base::PlatformFileError error,
+    const base::PlatformFileInfo& file_info,
+    const base::FilePath& platform_path,
+    const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref) {
+  // TODO(gbillock): need to check here that file_ref is null or anything?

[kinuko, 2013/07/04 03:10:12]

I think you can just bind the ref to the callback of StartPostWriteValidation so
that it's kept until the validation is done.

[Greg Billock, 2013/07/08 20:01:53]

Yeah. Steve and I figured this out I think. I'm just passing it through to the
call. Docs say that scoped_refptr's will pass intact like that. (Bind has
special mechanics for them.)

+  if (error != base::PLATFORM_FILE_OK) {
+    operation_runner()->Remove(
+        url_pair.dest, true,
+        base::Bind(&CopyOrMoveOperationDelegate::DidRemoveDestForError,
+                   AsWeakPtr(), error, callback));
+    return;
+  }
+
+  DCHECK(validator_.get());
+  validator_->StartPostWriteValidation(
+      platform_path, file_ref,
+      base::Bind(&CopyOrMoveOperationDelegate::DidPostWriteValidation,
+                 AsWeakPtr(), url_pair, callback));
+}
+
+void CopyOrMoveOperationDelegate::DidPostWriteValidation(
+    const URLPair& url_pair,
+    const StatusCallback& callback,
+    base::PlatformFileError error) {
+  if (error != base::PLATFORM_FILE_OK) {
+    operation_runner()->Remove(
+        url_pair.dest, true,
+        base::Bind(&CopyOrMoveOperationDelegate::DidRemoveDestForError,
+                   AsWeakPtr(), error, callback));
+    return;
+  }
+
+  if (operation_type_ == OPERATION_COPY) {
+    callback.Run(error);
+    return;
+  }
 
   DCHECK_EQ(OPERATION_MOVE, operation_type_);
 
   // Remove the source for finalizing move operation.
   operation_runner()->Remove(
-      src, true /* recursive */,
+      url_pair.src, true /* recursive */,
       base::Bind(&CopyOrMoveOperationDelegate::DidRemoveSourceForMove,
                  AsWeakPtr(), callback));
 }
 
 void CopyOrMoveOperationDelegate::DidRemoveSourceForMove(
     const StatusCallback& callback,
     base::PlatformFileError error) {
   if (error == base::PLATFORM_FILE_ERROR_NOT_FOUND)
     error = base::PLATFORM_FILE_OK;
   callback.Run(error);
 }
 
 FileSystemURL CopyOrMoveOperationDelegate::CreateDestURL(
     const FileSystemURL& src_url) const {
   DCHECK_EQ(src_root_.type(), src_url.type());
   DCHECK_EQ(src_root_.origin(), src_url.origin());
 
   base::FilePath relative = dest_root_.virtual_path();
   src_root_.virtual_path().AppendRelativePath(src_url.virtual_path(),
                                               &relative);
   return file_system_context()->CreateCrackedFileSystemURL(
       dest_root_.origin(),
       dest_root_.mount_type(),
       relative);
 }
 
+void CopyOrMoveOperationDelegate::DidRemoveDestForError(
+    base::PlatformFileError prior_error,
+    const StatusCallback& callback,
+    base::PlatformFileError error) {
+  callback.Run(prior_error);
+}
+
 }  // namespace fileapi