Cronet for iOS with C API for GRPC support.

components/cronet/ios/cronet_environment.h

Index: components/cronet/ios/cronet_environment.h
diff --git a/components/cronet/ios/cronet_environment.h b/components/cronet/ios/cronet_environment.h
new file mode 100644
index 0000000000000000000000000000000000000000..3471d0ee2986004c6034b5d3735ac3b005f5fb31
--- /dev/null
+++ b/components/cronet/ios/cronet_environment.h
@@ -0,0 +1,135 @@
+// 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 "base/files/file_path.h"
+#include "base/macros.h"
+#include "base/message_loop/message_loop.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/threading/thread.h"
+#include "components/cronet/url_request_context_config.h"
+#include "net/cert/cert_verifier.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
+
+class JsonPrefStore;
+
+namespace base {
+class WaitableEvent;
+}  // namespace base
+
+namespace net {
+class HttpCache;
+class NetworkChangeNotifier;
+class NetLog;
+class ProxyConfigService;
+class WriteToFileNetLogObserver;
+}  // namespace net
+
+namespace cronet {
+// CronetEnvironment contains all the network stack configuration
+// and initialization.
+class CronetEnvironment {
+ public:
+  // Must be called on the main thread.
+  static void Initialize();

[xunjieli, 2016/04/14 15:43:39]

Why is this method static?
Why do we have both Initialize() and Install()? It isn't clear what the
differences are.

+
+  // |user_agent_product_name| will be used to generate the user-agent.
+  CronetEnvironment(const std::string& user_agent_product_name);
+  ~CronetEnvironment();
+
+  // Installs this Cronet environment. Can only be called once.

[xunjieli, 2016/04/14 15:43:39]

Can install() be called on any thread? Maybe document the requirement?

[kapishnikov, 2016/04/14 15:54:57]

Btw, should we rename Install() => Start() ?

[mef, 2016/04/14 21:17:36]

Done.

[mef, 2016/04/14 21:17:36]

Done.

+  void Install();
+
+  // The full user-agent.
+  std::string user_agent();
+
+  // Creates a new net log (overwrites existing file with this name). If
+  // actively logging, this call is ignored.
+  void 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 Install() 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_cert_verifier(scoped_ptr<net::CertVerifier> cert_verifier) {
+    cert_verifier_ = std::move(cert_verifier);
+  }
+
+  void set_host_resolver_rules(const std::string& host_resolver_rules) {
+    host_resolver_rules_ = 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;
+  }
+
+  net::URLRequestContext* GetURLRequestContext() const;
+
+  bool IsOnNetworkThread();
+
+  // Runs a closure on the network thread.
+  void PostToNetworkThread(const tracked_objects::Location& from_here,
+                           const base::Closure& task);
+
+ private:
+  // Performs initialization tasks that must happen on the network thread.
+  void InitializeOnNetworkThread();
+
+  // 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(const base::FilePath::StringType& file_name,
+                                  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);
+
+  bool http2_enabled_;
+  bool quic_enabled_;
+  std::string host_resolver_rules_;
+  std::string ssl_key_log_file_name_;
+
+  std::list<net::HostPortPair> quic_hints_;
+
+  static CronetEnvironment* chrome_net_;

[xunjieli, 2016/04/14 15:43:39]

Why is this "static"?

[mef, 2016/04/14 21:17:36]

Done.

+  scoped_ptr<base::Thread> network_io_thread_;
+  scoped_ptr<base::Thread> network_cache_thread_;
+  scoped_ptr<base::Thread> file_thread_;
+  scoped_ptr<base::Thread> file_user_blocking_thread_;
+  scoped_refptr<base::SequencedTaskRunner> pref_store_worker_pool_;
+  scoped_refptr<JsonPrefStore> net_pref_store_;
+  scoped_ptr<net::CertVerifier> cert_verifier_;
+  scoped_ptr<net::ProxyConfigService> proxy_config_service_;
+  scoped_ptr<net::HttpServerProperties> http_server_properties_;
+  scoped_ptr<net::URLRequestContext> main_context_;
+  std::string user_agent_product_name_;
+  scoped_ptr<net::NetLog> net_log_;
+  scoped_ptr<net::WriteToFileNetLogObserver> net_log_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(CronetEnvironment);
+};
+
+}  // namespace cronet
+
+#endif  // COMPONENTS_CRONET_IOS_CRONET_ENVIRONMENT_H_