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// Copyright (c) 2012 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.
#ifndef CONTENT_BROWSER_RESOLVE_PROXY_HELPER_H_
#define CONTENT_BROWSER_RESOLVE_PROXY_HELPER_H_
#include <string>
#include "base/containers/circular_deque.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/optional.h"
#include "base/sequenced_task_runner_helpers.h"
#include "content/common/content_export.h"
#include "content/common/renderer_host.mojom.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "services/network/public/mojom/proxy_lookup_client.mojom.h"
#include "url/gurl.h"
namespace net {
class ProxyInfo;
}
namespace content {
// Responds to ResolveProxyCallback, kicking off a proxy lookup request on the
// UI thread using the specified proxy service. Completion is notified through
// the delegate. If multiple requests are started at the same time, they will
// run in FIFO order, with only 1 being outstanding at a time.
//
// When an instance of ResolveProxyHelper is destroyed, it cancels any
// outstanding proxy resolve requests with the proxy service. It also deletes
// the stored IPC::Message pointers for pending requests.
//
// This object does most of its work on the UI thread. It holds onto a
// self-reference as long as there's a pending Mojo call, as losing its last
// reference on the IO thread with an open mojo pipe that lives on the UI
// thread leads to problems.
class CONTENT_EXPORT ResolveProxyHelper
: public base::RefCounted<ResolveProxyHelper>,
public network::mojom::ProxyLookupClient {
public:
explicit ResolveProxyHelper(int render_process_host_id);
using ResolveProxyCallback = mojom::RendererHost::ResolveProxyCallback;
void ResolveProxy(const GURL& url, ResolveProxyCallback callback);
protected:
// Destruction cancels the current outstanding request, and clears the
// pending queue.
~ResolveProxyHelper() override;
private:
// Used to destroy the |ResolveProxyHelper| on the UI thread.
friend class base::DeleteHelper<ResolveProxyHelper>;
friend class base::RefCounted<ResolveProxyHelper>;
// Starts the first pending request.
void StartPendingRequest();
// Virtual for testing. Returns false if unable to get a network service, due
// to the RenderProcessHost no longer existing.
virtual bool SendRequestToNetworkService(
const GURL& url,
mojo::PendingRemote<network::mojom::ProxyLookupClient>
proxy_lookup_client);
// network::mojom::ProxyLookupClient implementation.
void OnProxyLookupComplete(
int32_t net_error,
const base::Optional<net::ProxyInfo>& proxy_info) override;
// A PendingRequest is a resolve request that is in progress, or queued.
struct PendingRequest {
public:
PendingRequest(const GURL& url, ResolveProxyCallback callback);
PendingRequest(PendingRequest&& pending_request) noexcept;
~PendingRequest();
PendingRequest& operator=(PendingRequest&& pending_request) noexcept;
// The URL of the request.
GURL url;
// Data to pass back to the delegate on completion (we own it until then).
ResolveProxyCallback callback;
private:
DISALLOW_COPY_AND_ASSIGN(PendingRequest);
};
const int render_process_host_id_;
// FIFO queue of pending requests. The first entry is always the current one.
using PendingRequestList = base::circular_deque<PendingRequest>;
PendingRequestList pending_requests_;
// Self-reference. Owned as long as there's an outstanding proxy lookup.
// Needed to shut down safely, since this class is refcounted, with some
// references owned on multiple threads, while |receiver_| lives on the UI
// thread, and may receive callbacks there whenever there's a pending request.
scoped_refptr<ResolveProxyHelper> owned_self_;
// Receiver for the currently in-progress request, if any.
mojo::Receiver<network::mojom::ProxyLookupClient> receiver_{this};
DISALLOW_COPY_AND_ASSIGN(ResolveProxyHelper);
};
} // namespace content
#endif // CONTENT_BROWSER_RESOLVE_PROXY_HELPER_H_
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