63 lines
2 KiB
C++
63 lines
2 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_EDK_JS_DRAIN_DATA_H_
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#define MOJO_EDK_JS_DRAIN_DATA_H_
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#include "base/memory/scoped_vector.h"
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#include "gin/runner.h"
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#include "mojo/public/cpp/system/core.h"
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#include "mojo/public/cpp/system/watcher.h"
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#include "v8/include/v8.h"
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namespace mojo {
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namespace edk {
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namespace js {
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// This class is the implementation of the Mojo JavaScript core module's
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// drainData() method. It is not intended to be used directly. The caller
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// allocates a DrainData on the heap and returns GetPromise() to JS. The
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// implementation deletes itself after reading as much data as possible
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// and rejecting or resolving the Promise.
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class DrainData {
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public:
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// Starts waiting for data on the specified data pipe consumer handle.
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// See WaitForData(). The constructor does not block.
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DrainData(v8::Isolate* isolate, mojo::Handle handle);
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// Returns a Promise that will be settled when no more data can be read.
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// Should be called just once on a newly allocated DrainData object.
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v8::Handle<v8::Value> GetPromise();
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private:
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~DrainData();
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// Waits for data to be available. DataReady() will be notified.
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void WaitForData();
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// Use ReadData() to read whatever is availble now on handle_ and save
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// it in data_buffers_.
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void DataReady(MojoResult result);
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MojoResult ReadData();
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// When the remote data pipe handle is closed, or an error occurs, deliver
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// all of the buffered data to the JS Promise and then delete this.
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void DeliverData(MojoResult result);
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using DataBuffer = std::vector<char>;
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v8::Isolate* isolate_;
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ScopedDataPipeConsumerHandle handle_;
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Watcher handle_watcher_;
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base::WeakPtr<gin::Runner> runner_;
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v8::UniquePersistent<v8::Promise::Resolver> resolver_;
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ScopedVector<DataBuffer> data_buffers_;
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};
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} // namespace js
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} // namespace edk
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} // namespace mojo
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#endif // MOJO_EDK_JS_DRAIN_DATA_H_
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