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99 lines
3.2 KiB
99 lines
3.2 KiB
4 months ago
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// Copyright (C) 2010 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef UPDATE_ENGINE_COMMON_PROXY_RESOLVER_H_
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#define UPDATE_ENGINE_COMMON_PROXY_RESOLVER_H_
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#include <deque>
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#include <string>
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#include <base/logging.h>
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#include <brillo/message_loops/message_loop.h>
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#include "update_engine/common/utils.h"
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namespace chromeos_update_engine {
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extern const char kNoProxy[];
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// Callback for a call to GetProxiesForUrl().
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// Resultant proxies are in |out_proxy|. Each will be in one of the
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// following forms:
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// http://<host>[:<port>] - HTTP proxy
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// socks{4,5}://<host>[:<port>] - SOCKS4/5 proxy
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// kNoProxy - no proxy
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typedef base::Callback<void(const std::deque<std::string>& proxies)>
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ProxiesResolvedFn;
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// An id that identifies a proxy request. Used to cancel an ongoing request
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// before the callback is called.
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typedef brillo::MessageLoop::TaskId ProxyRequestId;
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// A constant identifying an invalid ProxyRequestId.
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extern const ProxyRequestId kProxyRequestIdNull;
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class ProxyResolver {
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public:
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ProxyResolver() {}
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virtual ~ProxyResolver() {}
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// Finds proxies for the given URL and returns them via the callback.
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// Returns the id of the pending request on success or kProxyRequestIdNull
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// otherwise.
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virtual ProxyRequestId GetProxiesForUrl(
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const std::string& url, const ProxiesResolvedFn& callback) = 0;
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// Cancel the proxy resolution request initiated by GetProxiesForUrl(). The
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// |request| value must be the one provided by GetProxiesForUrl().
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virtual bool CancelProxyRequest(ProxyRequestId request) = 0;
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private:
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DISALLOW_COPY_AND_ASSIGN(ProxyResolver);
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};
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// Always says to not use a proxy
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class DirectProxyResolver : public ProxyResolver {
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public:
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DirectProxyResolver() = default;
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~DirectProxyResolver() override;
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ProxyRequestId GetProxiesForUrl(const std::string& url,
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const ProxiesResolvedFn& callback) override;
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bool CancelProxyRequest(ProxyRequestId request) override;
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// Set the number of direct (non-) proxies to be returned by resolver.
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// The default value is 1; higher numbers are currently used in testing.
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inline void set_num_proxies(size_t num_proxies) {
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num_proxies_ = num_proxies;
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}
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private:
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// The ID of the main loop callback.
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brillo::MessageLoop::TaskId idle_callback_id_{
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brillo::MessageLoop::kTaskIdNull};
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// Number of direct proxies to return on resolved list; currently used for
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// testing.
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size_t num_proxies_{1};
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// The MainLoop callback, from here we return to the client.
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void ReturnCallback(const ProxiesResolvedFn& callback);
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DISALLOW_COPY_AND_ASSIGN(DirectProxyResolver);
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_COMMON_PROXY_RESOLVER_H_
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