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/*
* Copyright (C) 2009, 2012 Google Inc. All rights reserved.
* Copyright (C) 2013, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_THREADABLE_LOADER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_THREADABLE_LOADER_H_
#include <memory>
#include "base/macros.h"
#include "services/network/public/mojom/fetch_api.mojom-blink.h"
#include "third_party/blink/public/mojom/fetch/fetch_api_request.mojom-blink-forward.h"
#include "third_party/blink/public/platform/web_url_loader.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/loader/fetch/raw_resource.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_error.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_loader_options.h"
#include "third_party/blink/renderer/platform/network/http_header_map.h"
#include "third_party/blink/renderer/platform/timer.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
class ExecutionContext;
class ResourceRequest;
class ThreadableLoaderClient;
// Useful for doing loader operations from any thread (not threadsafe, just able
// to run on threads other than the main thread).
//
// Can perform requests either synchronously or asynchronously. Requests are
// asynchronous by default, and this behavior can be controlled by passing
// a ResourceLoaderOptions with synchronous_policy == kRequestSynchronously to
// the constructor.
// In either case, Start() must be called to actaully begin the request.
class CORE_EXPORT ThreadableLoader final
: public GarbageCollected<ThreadableLoader>,
private RawResourceClient {
public:
// ThreadableLoaderClient methods are never called before Start() call.
//
// Loading is separated into the constructor and the Start() method in order
// to:
// - reduce work done in a constructor
// - not to ask the users to handle failures in the constructor and other
// async failures separately
//
// Loading completes when one of the following methods are called:
// - DidFinishLoading()
// - DidFail()
// - DidFailRedirectCheck()
// After any of these methods is called, the loader won't call any of the
// ThreadableLoaderClient methods.
//
// When ThreadableLoader::Cancel() is called,
// ThreadableLoaderClient::DidFail() is called with a ResourceError
// with IsCancellation() returning true, if any of DidFinishLoading()
// or DidFail.*() methods have not been called yet. (DidFail() may be
// called with a ResourceError with IsCancellation() returning true
// also for cancellation happened inside the loader.)
//
// ThreadableLoaderClient methods may call Cancel().
//
// The specified ResourceFetcher if non-null, or otherwise
// ExecutionContext::Fetcher() is used.
ThreadableLoader(ExecutionContext&,
ThreadableLoaderClient*,
const ResourceLoaderOptions&,
ResourceFetcher* = nullptr);
~ThreadableLoader() override;
// Must be called to actually begin the request.
void Start(ResourceRequest);
// A ThreadableLoader may have a timeout specified. It is possible, in some
// cases, for the timeout to be overridden after the request is sent (for
// example, XMLHttpRequests may override their timeout setting after sending).
//
// If the request has already started, the new timeout will be relative to the
// time the request started.
//
// Passing a timeout of zero means there should be no timeout.
void SetTimeout(const base::TimeDelta& timeout);
void Cancel();
// Detach the loader from the request. This function is for "keepalive"
// requests. No notification will be sent to the client, but the request
// will be processed.
void Detach();
void SetDefersLoading(bool);
void Trace(Visitor* visitor) const override;
private:
void Clear();
void DidTimeout(TimerBase*);
void DispatchDidFail(const ResourceError&);
// ResourceClient implementation:
void NotifyFinished(Resource*) override;
String DebugName() const override { return "ThreadableLoader"; }
// RawResourceClient implementation:
void DataSent(Resource*,
uint64_t bytes_sent,
uint64_t total_bytes_to_be_sent) override;
void ResponseReceived(Resource*, const ResourceResponse&) override;
void ResponseBodyReceived(Resource*, BytesConsumer& body) override;
void SetSerializedCachedMetadata(Resource*, const uint8_t*, size_t) override;
void DataReceived(Resource*, const char* data, size_t data_length) override;
bool RedirectReceived(Resource*,
const ResourceRequest&,
const ResourceResponse&) override;
void RedirectBlocked() override;
void DataDownloaded(Resource*, uint64_t) override;
void DidDownloadToBlob(Resource*, scoped_refptr<BlobDataHandle>) override;
Member<ThreadableLoaderClient> client_;
Member<ExecutionContext> execution_context_;
Member<ResourceFetcher> resource_fetcher_;
const ResourceLoaderOptions resource_loader_options_;
// Saved so that we can use the original mode in ResponseReceived() where
// |resource| might be a reused one (e.g. preloaded resource) which can have a
// different mode.
network::mojom::RequestMode request_mode_;
// Set via SetTimeout() by a user before Start().
base::TimeDelta timeout_;
// Used to detect |timeout_| is over.
TaskRunnerTimer<ThreadableLoader> timeout_timer_;
// Time an asynchronous fetch request is started
base::TimeTicks request_started_;
RawResourceClientStateChecker checker_;
DISALLOW_COPY_AND_ASSIGN(ThreadableLoader);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LOADER_THREADABLE_LOADER_H_
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