components/cronet/ios/cronet_environment.h

// Copyright 2016 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 COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_
#define COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_

#include <list>
#include <string>
#include <vector>

#include "base/files/file_path.h"
#include "base/files/scoped_file.h"
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/sys_string_conversions.h"
#include "base/synchronization/waitable_event.h"
#include "base/threading/thread.h"
#include "components/cronet/ios/version.h"
#include "components/cronet/url_request_context_config.h"
#include "net/cert/cert_verifier.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"

namespace base {
class WaitableEvent;
}  // namespace base

namespace net {
class CookieStore;
class NetLog;
class WriteToFileNetLogObserver;
}  // namespace net

namespace cronet {
// CronetEnvironment contains all the network stack configuration
// and initialization.
class CronetEnvironment {
 public:
  // Initialize Cronet environment globals. Must be called only once on the
  // main thread.
  static void Initialize();

  // |user_agent| will be used to generate the user-agent if
  // |user_agent_partial| is true, or will be used as the complete user-agent
  // otherwise.
  CronetEnvironment(const std::string& user_agent, bool user_agent_partial);
  ~CronetEnvironment();

  // Starts this instance of Cronet environment.
  void Start();

  // The full user-agent.
  std::string user_agent();

  // Get global UMA histogram deltas.
  std::vector<uint8_t> GetHistogramDeltas();

  // Creates a new net log (overwrites existing file with this name). If
  // actively logging, this call is ignored.
  bool StartNetLog(base::FilePath::StringType file_name, bool log_bytes);
  // Stops logging and flushes file. If not currently logging this call is
  // ignored.
  void StopNetLog();

  void AddQuicHint(const std::string& host, int port, int alternate_port);

  // Setters and getters for |http2_enabled_|, |quic_enabled_|, and
  // |forced_quic_origin_|. These only have any effect before Start() is
  // called.
  void set_http2_enabled(bool enabled) { http2_enabled_ = enabled; }
  void set_quic_enabled(bool enabled) { quic_enabled_ = enabled; }

  bool http2_enabled() const { return http2_enabled_; }
  bool quic_enabled() const { return quic_enabled_; }

  void set_quic_user_agent_id(const std::string& quic_user_agent_id) {
    quic_user_agent_id_ = quic_user_agent_id;
  }

  void set_accept_language(const std::string& accept_language) {
    accept_language_ = accept_language;
  }

  void set_mock_cert_verifier(
      std::unique_ptr<net::CertVerifier> mock_cert_verifier) {
    mock_cert_verifier_ = std::move(mock_cert_verifier);
  }

  void set_http_cache(URLRequestContextConfig::HttpCacheType http_cache) {
    http_cache_ = http_cache;
  }

  void SetHostResolverRules(const std::string& host_resolver_rules);

  void set_ssl_key_log_file_name(const std::string& ssl_key_log_file_name) {
    ssl_key_log_file_name_ = ssl_key_log_file_name;
  }

  // Returns the URLRequestContext associated with this object.
  net::URLRequestContext* GetURLRequestContext() const;

  // Return the URLRequestContextGetter associated with this object.
  net::URLRequestContextGetter* GetURLRequestContextGetter() const;

 private:
  // Performs initialization tasks that must happen on the network thread.
  void InitializeOnNetworkThread();

  // Runs a closure on the network thread.
  void PostToNetworkThread(const tracked_objects::Location& from_here,
                           const base::Closure& task);

  // Runs a closure on the file user blocking thread.
  void PostToFileUserBlockingThread(const tracked_objects::Location& from_here,
                                    const base::Closure& task);

  // Helper methods that start/stop net logging on the network thread.
  void StartNetLogOnNetworkThread(base::ScopedFILE file, bool log_bytes);
  void StopNetLogOnNetworkThread(base::WaitableEvent* log_stopped_event);

  // Returns the HttpNetworkSession object from the passed in
  // URLRequestContext or NULL if none exists.
  net::HttpNetworkSession* GetHttpNetworkSession(
      net::URLRequestContext* context);

  // Sets host resolver rules on the network_io_thread_.
  void SetHostResolverRulesOnNetworkThread(const std::string& rules,
                                           base::WaitableEvent* event);

  std::string getDefaultQuicUserAgentId() const;

  bool http2_enabled_;
  bool quic_enabled_;
  std::string quic_user_agent_id_;
  std::string accept_language_;
  std::string ssl_key_log_file_name_;
  URLRequestContextConfig::HttpCacheType http_cache_;

  std::list<net::HostPortPair> quic_hints_;

  std::unique_ptr<base::Thread> network_io_thread_;
  std::unique_ptr<base::Thread> network_cache_thread_;
  std::unique_ptr<base::Thread> file_thread_;
  std::unique_ptr<base::Thread> file_user_blocking_thread_;
  scoped_refptr<base::SequencedTaskRunner> pref_store_worker_pool_;
  std::unique_ptr<net::CertVerifier> mock_cert_verifier_;
  std::unique_ptr<net::CookieStore> cookie_store_;
  std::unique_ptr<net::URLRequestContext> main_context_;
  scoped_refptr<net::URLRequestContextGetter> main_context_getter_;
  std::string user_agent_;
  bool user_agent_partial_;
  std::unique_ptr<net::NetLog> net_log_;
  std::unique_ptr<net::WriteToFileNetLogObserver> net_log_observer_;

  DISALLOW_COPY_AND_ASSIGN(CronetEnvironment);
};

}  // namespace cronet

#endif  // COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_