1// 2// Copyright (C) 2010 The Android Open Source Project 3// 4// Licensed under the Apache License, Version 2.0 (the "License"); 5// you may not use this file except in compliance with the License. 6// You may obtain a copy of the License at 7// 8// http://www.apache.org/licenses/LICENSE-2.0 9// 10// Unless required by applicable law or agreed to in writing, software 11// distributed under the License is distributed on an "AS IS" BASIS, 12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13// See the License for the specific language governing permissions and 14// limitations under the License. 15// 16 17#ifndef UPDATE_ENGINE_PROXY_RESOLVER_H_ 18#define UPDATE_ENGINE_PROXY_RESOLVER_H_ 19 20#include <deque> 21#include <string> 22 23#include <base/logging.h> 24#include <brillo/message_loops/message_loop.h> 25 26#include "update_engine/common/utils.h" 27 28namespace chromeos_update_engine { 29 30extern const char kNoProxy[]; 31 32// Callback for a call to GetProxiesForUrl(). 33// Resultant proxies are in |out_proxy|. Each will be in one of the 34// following forms: 35// http://<host>[:<port>] - HTTP proxy 36// socks{4,5}://<host>[:<port>] - SOCKS4/5 proxy 37// kNoProxy - no proxy 38typedef void (*ProxiesResolvedFn)(const std::deque<std::string>& proxies, 39 void* data); 40 41class ProxyResolver { 42 public: 43 ProxyResolver() {} 44 virtual ~ProxyResolver() {} 45 46 // Finds proxies for the given URL and returns them via the callback. 47 // |data| will be passed to the callback. 48 // Returns true on success. 49 virtual bool GetProxiesForUrl(const std::string& url, 50 ProxiesResolvedFn callback, 51 void* data) = 0; 52 53 private: 54 DISALLOW_COPY_AND_ASSIGN(ProxyResolver); 55}; 56 57// Always says to not use a proxy 58class DirectProxyResolver : public ProxyResolver { 59 public: 60 DirectProxyResolver() = default; 61 ~DirectProxyResolver() override; 62 bool GetProxiesForUrl(const std::string& url, 63 ProxiesResolvedFn callback, 64 void* data) override; 65 66 // Set the number of direct (non-) proxies to be returned by resolver. 67 // The default value is 1; higher numbers are currently used in testing. 68 inline void set_num_proxies(size_t num_proxies) { 69 num_proxies_ = num_proxies; 70 } 71 72 private: 73 // The ID of the main loop callback. 74 brillo::MessageLoop::TaskId idle_callback_id_{ 75 brillo::MessageLoop::kTaskIdNull}; 76 77 // Number of direct proxies to return on resolved list; currently used for 78 // testing. 79 size_t num_proxies_{1}; 80 81 // The MainLoop callback, from here we return to the client. 82 void ReturnCallback(ProxiesResolvedFn callback, void* data); 83 DISALLOW_COPY_AND_ASSIGN(DirectProxyResolver); 84}; 85 86} // namespace chromeos_update_engine 87 88#endif // UPDATE_ENGINE_PROXY_RESOLVER_H_ 89