138 lines
4.1 KiB
C++
138 lines
4.1 KiB
C++
// Copyright (c) 2016 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "atom/browser/atom_blob_reader.h"
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#include "content/browser/blob_storage/chrome_blob_storage_context.h"
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#include "content/public/browser/browser_thread.h"
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#include "net/base/io_buffer.h"
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#include "net/base/net_errors.h"
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#include "storage/browser/blob/blob_data_handle.h"
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#include "storage/browser/blob/blob_reader.h"
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#include "storage/browser/blob/blob_storage_context.h"
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#include "storage/browser/fileapi/file_system_context.h"
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#include "atom/common/node_includes.h"
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using content::BrowserThread;
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namespace atom {
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namespace {
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void FreeNodeBufferData(char* data, void* hint) {
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delete[] data;
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}
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void RunCallbackInUI(
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const AtomBlobReader::CompletionCallback& callback,
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char* blob_data,
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int size) {
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DCHECK_CURRENTLY_ON(BrowserThread::UI);
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v8::Isolate* isolate = v8::Isolate::GetCurrent();
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v8::Locker locker(isolate);
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v8::HandleScope handle_scope(isolate);
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if (blob_data) {
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v8::Local<v8::Value> buffer = node::Buffer::New(isolate,
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blob_data, static_cast<size_t>(size), &FreeNodeBufferData, nullptr)
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.ToLocalChecked();
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callback.Run(buffer);
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} else {
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callback.Run(v8::Null(isolate));
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}
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}
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} // namespace
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AtomBlobReader::AtomBlobReader(
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content::ChromeBlobStorageContext* blob_context,
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storage::FileSystemContext* file_system_context)
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: blob_context_(blob_context),
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file_system_context_(file_system_context) {
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}
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AtomBlobReader::~AtomBlobReader() {
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}
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void AtomBlobReader::StartReading(
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const std::string& uuid,
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const AtomBlobReader::CompletionCallback& completion_callback) {
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DCHECK_CURRENTLY_ON(BrowserThread::IO);
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auto blob_data_handle =
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blob_context_->context()->GetBlobDataFromUUID(uuid);
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auto callback = base::Bind(&RunCallbackInUI,
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completion_callback);
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if (!blob_data_handle) {
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BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
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base::Bind(callback, nullptr, 0));
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return;
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}
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auto blob_reader = blob_data_handle->CreateReader(
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file_system_context_.get(),
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BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE).get());
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BlobReadHelper* blob_read_helper =
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new BlobReadHelper(std::move(blob_reader), callback);
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blob_read_helper->Read();
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}
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AtomBlobReader::BlobReadHelper::BlobReadHelper(
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std::unique_ptr<storage::BlobReader> blob_reader,
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const BlobReadHelper::CompletionCallback& callback)
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: blob_reader_(std::move(blob_reader)),
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completion_callback_(callback) {
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}
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AtomBlobReader::BlobReadHelper::~BlobReadHelper() {
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}
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void AtomBlobReader::BlobReadHelper::Read() {
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DCHECK_CURRENTLY_ON(BrowserThread::IO);
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storage::BlobReader::Status size_status = blob_reader_->CalculateSize(
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base::Bind(&AtomBlobReader::BlobReadHelper::DidCalculateSize,
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base::Unretained(this)));
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if (size_status != storage::BlobReader::Status::IO_PENDING)
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DidCalculateSize(net::OK);
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}
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void AtomBlobReader::BlobReadHelper::DidCalculateSize(int result) {
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DCHECK_CURRENTLY_ON(BrowserThread::IO);
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if (result != net::OK) {
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DidReadBlobData(nullptr, 0);
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return;
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}
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uint64_t total_size = blob_reader_->total_size();
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int bytes_read = 0;
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scoped_refptr<net::IOBuffer> blob_data =
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new net::IOBuffer(static_cast<size_t>(total_size));
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auto callback = base::Bind(&AtomBlobReader::BlobReadHelper::DidReadBlobData,
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base::Unretained(this),
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base::RetainedRef(blob_data));
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storage::BlobReader::Status read_status = blob_reader_->Read(
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blob_data.get(),
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total_size,
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&bytes_read,
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callback);
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if (read_status != storage::BlobReader::Status::IO_PENDING)
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callback.Run(bytes_read);
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}
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void AtomBlobReader::BlobReadHelper::DidReadBlobData(
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const scoped_refptr<net::IOBuffer>& blob_data,
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int size) {
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DCHECK_CURRENTLY_ON(BrowserThread::IO);
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char* data = new char[size];
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memcpy(data, blob_data->data(), size);
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BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
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base::Bind(completion_callback_, data, size));
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delete this;
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}
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} // namespace atom
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