QUIC - reorganize common code between quic_client and quic_simple_client

net/tools/quic/quic_client_base.h

+// Copyright (c) 2015 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.
+//
+// A base class for the toy client, which connects to a specified port and sends
+// QUIC request to that endpoint.
+
+#ifndef NET_TOOLS_QUIC_QUIC_CLIENT_BASE_H_
+#define NET_TOOLS_QUIC_QUIC_CLIENT_BASE_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/ip_endpoint.h"
+#include "net/log/net_log.h"
+#include "net/quic/crypto/crypto_handshake.h"
+#include "net/quic/crypto/quic_crypto_client_config.h"
+#include "net/quic/quic_bandwidth.h"
+#include "net/quic/quic_config.h"
+#include "net/quic/quic_connection.h"
+#include "net/quic/quic_packet_writer.h"
+#include "net/quic/quic_protocol.h"
+#include "net/tools/quic/quic_client_session.h"
+#include "net/tools/quic/quic_spdy_client_stream.h"
+
+namespace net {
+
+class ProofVerifier;
+class QuicServerId;
+
+namespace tools {
+
+class QuicClientBase {
+ public:
+  // A packet writer factory that always returns the same writer.
+  class DummyPacketWriterFactory : public QuicConnection::PacketWriterFactory {
+   public:
+    explicit DummyPacketWriterFactory(QuicPacketWriter* writer);
+    ~DummyPacketWriterFactory() override;
+
+    QuicPacketWriter* Create(QuicConnection* connection) const override;
+
+   private:
+    QuicPacketWriter* writer_;
+  };
+
+  QuicClientBase(const QuicServerId& server_id,
+                 const QuicVersionVector& supported_versions,
+                 const QuicConfig& config);
+
+  ~QuicClientBase();
+
+  // Initializes the client to create a connection. Should be called exactly
+  // once before calling StartConnect or Connect. Returns true if the
+  // initialization succeeds, false otherwise.
+  virtual bool Initialize();
+
+  // Returns true if the crypto handshake has yet to establish encryption.
+  // Returns false if encryption is active (even if the server hasn't confirmed
+  // the handshake) or if the connection has been closed.
+  bool EncryptionBeingEstablished();
+
+  // Returns a newly created QuicSpdyClientStream, owned by the
+  // QuicSimpleClient.
+  QuicSpdyClientStream* CreateReliableClientStream();
+
+  // Wait for events until the stream with the given ID is closed.
+  void WaitForStreamToClose(QuicStreamId id);
+
+  // Wait for events until the handshake is confirmed.
+  void WaitForCryptoHandshakeConfirmed();
+
+  // Wait up to 50ms, and handle any events which occur.
+  // Returns true if there are any outstanding requests.
+  virtual bool WaitForEvents() = 0;
+
+  QuicClientSession* session() { return session_.get(); }
+
+  bool connected() const;
+  bool goaway_received() const;
+
+  const QuicServerId& server_id() const { return server_id_; }
+
+  // This should only be set before the initial Connect()
+  void set_server_id(const QuicServerId& server_id) { server_id_ = server_id; }
+
+  void SetUserAgentID(const std::string& user_agent_id) {
+    crypto_config_.set_user_agent_id(user_agent_id);
+  }
+
+  // SetProofVerifier sets the ProofVerifier that will be used to verify the
+  // server's certificate and takes ownership of |verifier|.
+  void SetProofVerifier(ProofVerifier* verifier) {
+    // TODO(rtenneti): We should set ProofVerifier in QuicClientSession.
+    crypto_config_.SetProofVerifier(verifier);
+  }
+
+  // SetChannelIDSource sets a ChannelIDSource that will be called, when the
+  // server supports channel IDs, to obtain a channel ID for signing a message
+  // proving possession of the channel ID. This object takes ownership of
+  // |source|.
+  void SetChannelIDSource(ChannelIDSource* source) {
+    crypto_config_.SetChannelIDSource(source);
+  }
+
+  const QuicVersionVector& supported_versions() const {
+    return supported_versions_;
+  }
+
+  void SetSupportedVersions(const QuicVersionVector& versions) {
+    supported_versions_ = versions;
+  }
+
+  QuicConfig* config() { return &config_; }
+
+  QuicCryptoClientConfig* crypto_config() { return &crypto_config_; }
+
+  // Change the initial maximum packet size of the connection.  Has to be called
+  // before Connect()/StartConnect() in order to have any effect.
+  void set_initial_max_packet_length(QuicByteCount initial_max_packet_length) {
+    initial_max_packet_length_ = initial_max_packet_length;
+  }
+
+  int num_stateless_rejects_received() const {
+    return num_stateless_rejects_received_;
+  }
+
+  // The number of client hellos sent, taking stateless rejects into
+  // account.  In the case of a stateless reject, the initial
+  // connection object may be torn down and a new one created.  The
+  // user cannot rely upon the latest connection object to get the
+  // total number of client hellos sent, and should use this function
+  // instead.
+  int GetNumSentClientHellos();
+
+  // Gather the stats for the last session and update the stats for the overall
+  // connection.
+  void UpdateStats();
+
+  // Returns any errors that occurred at the connection-level (as
+  // opposed to the session-level).  When a stateless reject occurs,
+  // the error of the last session may not reflect the overall state
+  // of the connection.
+  QuicErrorCode connection_error() const;
+  void set_connection_error(QuicErrorCode connection_error) {
+    connection_error_ = connection_error;
+  }
+
+  bool connected_or_attempting_connect() const {
+    return connected_or_attempting_connect_;
+  }
+  void set_connected_or_attempting_connect(
+      bool connected_or_attempting_connect) {
+    connected_or_attempting_connect_ = connected_or_attempting_connect;
+  }
+
+  QuicPacketWriter* writer() { return writer_.get(); }
+  void set_writer(QuicPacketWriter* writer) {
+    if (writer_.get() != writer) {
+      writer_.reset(writer);
+    }
+  }
+  void reset_writer() { writer_.reset(); }
+
+  QuicByteCount initial_max_packet_length() {
+    return initial_max_packet_length_;
+  }
+
+ protected:
+  virtual QuicClientSession* CreateQuicClientSession(
+      QuicConnection* connection);
+
+  // Generates the next ConnectionId for |server_id_|.  By default, if the
+  // cached server config contains a server-designated ID, that ID will be
+  // returned.  Otherwise, the next random ID will be returned.
+  QuicConnectionId GetNextConnectionId();
+
+  // Returns the next server-designated ConnectionId from the cached config for
+  // |server_id_|, if it exists.  Otherwise, returns 0.
+  QuicConnectionId GetNextServerDesignatedConnectionId();
+
+  // Generates a new, random connection ID (as opposed to a server-designated
+  // connection ID).
+  virtual QuicConnectionId GenerateNewConnectionId();
+
+ private:
+  // |server_id_| is a tuple (hostname, port, is_https) of the server.
+  QuicServerId server_id_;
+
+  // config_ and crypto_config_ contain configuration and cached state about
+  // servers.
+  QuicConfig config_;
+  QuicCryptoClientConfig crypto_config_;
+
+  // Writer used to actually send packets to the wire. Needs to outlive
+  // |session_|.
+  scoped_ptr<QuicPacketWriter> writer_;
+
+  // Session which manages streams.
+  scoped_ptr<QuicClientSession> session_;
+
+  // This vector contains QUIC versions which we currently support.
+  // This should be ordered such that the highest supported version is the first
+  // element, with subsequent elements in descending order (versions can be
+  // skipped as necessary). We will always pick supported_versions_[0] as the
+  // initial version to use.
+  QuicVersionVector supported_versions_;
+
+  // The initial value of maximum packet size of the connection.  If set to
+  // zero, the default is used.
+  QuicByteCount initial_max_packet_length_;
+
+  // The number of stateless rejects received during the current/latest
+  // connection.
+  // TODO(jokulik): Consider some consistent naming scheme (or other) for member
+  // variables that are kept per-request, per-connection, and over the client's
+  // lifetime.
+  int num_stateless_rejects_received_;
+
+  // The number of hellos sent during the current/latest connection.
+  int num_sent_client_hellos_;
+
+  // Used to store any errors that occurred with the overall connection (as
+  // opposed to that associated with the last session object).
+  QuicErrorCode connection_error_;
+
+  // True when the client is attempting to connect or re-connect the session (in
+  // the case of a stateless reject).  Set to false  between a call to
+  // Disconnect() and the subsequent call to StartConnect().  When
+  // connected_or_attempting_connect_ is false, the session object corresponds
+  // to the previous client-level connection.
+  bool connected_or_attempting_connect_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuicClientBase);
+};
+
+}  // namespace tools
+}  // namespace net
+
+#endif  // NET_TOOLS_QUIC_QUIC_CLIENT_BASE_H_