зеркало из https://github.com/mozilla/gecko-dev.git
111 строки
3.4 KiB
C++
111 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef SimpleChannel_h
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#define SimpleChannel_h
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#include "mozilla/Result.h"
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#include "mozilla/UniquePtr.h"
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#include "nsCOMPtr.h"
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class nsIChannel;
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class nsIInputStream;
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class nsILoadInfo;
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class nsIRequest;
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class nsIStreamListener;
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class nsIURI;
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//-----------------------------------------------------------------------------
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namespace mozilla {
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using InputStreamOrReason = Result<nsCOMPtr<nsIInputStream>, nsresult>;
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using RequestOrReason = Result<nsCOMPtr<nsIRequest>, nsresult>;
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namespace net {
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class SimpleChannelCallbacks
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{
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public:
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virtual InputStreamOrReason OpenContentStream(bool async, nsIChannel* channel) = 0;
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virtual RequestOrReason StartAsyncRead(nsIStreamListener* stream, nsIChannel* channel) = 0;
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virtual ~SimpleChannelCallbacks() {}
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};
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template <typename F1, typename F2, typename T>
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class SimpleChannelCallbacksImpl final : public SimpleChannelCallbacks
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{
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public:
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SimpleChannelCallbacksImpl(F1&& aStartAsyncRead, F2&& aOpenContentStream, T* context)
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: mStartAsyncRead(aStartAsyncRead)
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, mOpenContentStream(aOpenContentStream)
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, mContext(context)
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{}
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virtual ~SimpleChannelCallbacksImpl() {}
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virtual InputStreamOrReason OpenContentStream(bool async, nsIChannel* channel) override
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{
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return mOpenContentStream(async, channel, mContext);
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}
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virtual RequestOrReason StartAsyncRead(nsIStreamListener* listener, nsIChannel* channel) override
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{
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return mStartAsyncRead(listener, channel, mContext);
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}
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private:
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F1 mStartAsyncRead;
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F2 mOpenContentStream;
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RefPtr<T> mContext;
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};
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already_AddRefed<nsIChannel>
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NS_NewSimpleChannelInternal(nsIURI* aURI, nsILoadInfo* aLoadInfo, UniquePtr<SimpleChannelCallbacks>&& aCallbacks);
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} // namespace net
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} // namespace mozilla
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/**
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* Creates a simple channel which wraps an input stream created by the given
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* callbacks. The callbacks are not called until the underlying AsyncOpen2 or
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* Open2 methods are called, and correspond to the nsBaseChannel::StartAsyncRead
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* and nsBaseChannel::OpenContentStream methods of the same names.
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*
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* The last two arguments of each callback are the created channel instance,
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* and the ref-counted context object passed to NS_NewSimpleChannel. A strong
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* reference to that object is guaranteed to be kept alive until after a
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* callback successfully completes.
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*/
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template <typename T, typename F1, typename F2>
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inline already_AddRefed<nsIChannel>
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NS_NewSimpleChannel(nsIURI* aURI, nsILoadInfo* aLoadInfo, T* context, F1&& aStartAsyncRead, F2&& aOpenContentStream)
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{
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using namespace mozilla;
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auto callbacks = MakeUnique<net::SimpleChannelCallbacksImpl<F1, F2, T>>(
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Move(aStartAsyncRead), Move(aOpenContentStream), context);
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return net::NS_NewSimpleChannelInternal(aURI, aLoadInfo, Move(callbacks));
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}
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template <typename T, typename F1>
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inline already_AddRefed<nsIChannel>
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NS_NewSimpleChannel(nsIURI* aURI, nsILoadInfo* aLoadInfo, T* context, F1&& aStartAsyncRead)
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{
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using namespace mozilla;
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auto openContentStream = [] (bool async, nsIChannel* channel, T* context) {
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return Err(NS_ERROR_NOT_IMPLEMENTED);
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};
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return NS_NewSimpleChannel(
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aURI, aLoadInfo, context, Move(aStartAsyncRead), Move(openContentStream));
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}
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#endif // SimpleChannel_h
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