| // 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_ |