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// 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/fileapi/recursive_operation_delegate.h"
#include "base/bind.h"
#include "webkit/fileapi/file_system_context.h"
#include "webkit/fileapi/file_system_operation_context.h"
#include "webkit/fileapi/local_file_system_operation.h"
namespace fileapi {
namespace {
// Don't start too many inflight operations.
const int kMaxInflightOperations = 5;
}
RecursiveOperationDelegate::RecursiveOperationDelegate(
LocalFileSystemOperation* original_operation)
: original_operation_(original_operation),
inflight_operations_(0) {
}
RecursiveOperationDelegate::~RecursiveOperationDelegate() {}
void RecursiveOperationDelegate::StartRecursiveOperation(
const FileSystemURL& root,
const StatusCallback& callback) {
callback_ = callback;
pending_directories_.push(root);
ProcessNextDirectory();
}
LocalFileSystemOperation* RecursiveOperationDelegate::NewOperation(
const FileSystemURL& url,
base::PlatformFileError* error_out) {
base::PlatformFileError error = base::PLATFORM_FILE_OK;
FileSystemOperation* operation = original_operation_->file_system_context()->
CreateFileSystemOperation(url, &error);
if (error != base::PLATFORM_FILE_OK) {
if (error_out)
*error_out = error;
return NULL;
}
LocalFileSystemOperation* local_operation =
operation->AsLocalFileSystemOperation();
DCHECK(local_operation);
// Let the new operation inherit from the original operation.
local_operation->set_overriding_operation_context(
original_operation_->operation_context());
if (error_out)
*error_out = base::PLATFORM_FILE_OK;
return local_operation;
}
FileSystemContext* RecursiveOperationDelegate::file_system_context() {
return original_operation_->file_system_context();
}
void RecursiveOperationDelegate::ProcessNextDirectory() {
DCHECK(pending_files_.empty());
if (inflight_operations_ > 0)
return;
if (pending_directories_.empty()) {
callback_.Run(base::PLATFORM_FILE_OK);
return;
}
FileSystemURL url = pending_directories_.front();
pending_directories_.pop();
inflight_operations_++;
ProcessDirectory(
url, base::Bind(&RecursiveOperationDelegate::DidProcessDirectory,
AsWeakPtr(), url));
}
void RecursiveOperationDelegate::ProcessPendingFiles() {
if (pending_files_.empty()) {
ProcessNextDirectory();
return;
}
while (!pending_files_.empty() &&
inflight_operations_ < kMaxInflightOperations) {
FileSystemURL url = pending_files_.front();
pending_files_.pop();
inflight_operations_++;
base::MessageLoopProxy::current()->PostTask(
FROM_HERE,
base::Bind(&RecursiveOperationDelegate::ProcessFile,
AsWeakPtr(), url,
base::Bind(&RecursiveOperationDelegate::DidProcessFile,
AsWeakPtr())));
}
}
void RecursiveOperationDelegate::DidProcessFile(base::PlatformFileError error) {
inflight_operations_--;
DCHECK_GE(inflight_operations_, 0);
if (error != base::PLATFORM_FILE_OK) {
callback_.Run(error);
return;
}
ProcessPendingFiles();
}
void RecursiveOperationDelegate::DidProcessDirectory(
const FileSystemURL& url,
base::PlatformFileError error) {
if (error != base::PLATFORM_FILE_OK) {
callback_.Run(error);
return;
}
LocalFileSystemOperation* operation = NewOperation(url, &error);
if (!operation) {
callback_.Run(error);
return;
}
operation->ReadDirectory(
url, base::Bind(&RecursiveOperationDelegate::DidReadDirectory,
AsWeakPtr(), url));
}
void RecursiveOperationDelegate::DidReadDirectory(
const FileSystemURL& parent,
base::PlatformFileError error,
const FileEntryList& entries,
bool has_more) {
if (error != base::PLATFORM_FILE_OK) {
if (error == base::PLATFORM_FILE_ERROR_NOT_A_DIRECTORY) {
// The given path may have been a file, so try RemoveFile now.
ProcessFile(parent,
base::Bind(&RecursiveOperationDelegate::DidTryProcessFile,
AsWeakPtr(), error));
return;
}
callback_.Run(error);
return;
}
for (size_t i = 0; i < entries.size(); i++) {
FileSystemURL url = parent.WithPath(parent.path().Append(entries[i].name));
if (entries[i].is_directory)
pending_directories_.push(url);
else
pending_files_.push(url);
}
if (has_more)
return;
inflight_operations_--;
DCHECK_GE(inflight_operations_, 0);
ProcessPendingFiles();
}
void RecursiveOperationDelegate::DidTryProcessFile(
base::PlatformFileError previous_error,
base::PlatformFileError error) {
if (error == base::PLATFORM_FILE_ERROR_NOT_A_FILE) {
// It wasn't a file either; returns with the previous error.
callback_.Run(previous_error);
return;
}
DidProcessFile(error);
}
} // namespace fileapi
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