node_types.h

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the Apache 2.0 License.
#pragma once
 
#include "ccf/crypto/sha256_hash.h"
#include "ccf/frame_format.h"
#include "ccf/tx_id.h"
#include "ds/ring_buffer_types.h"
 
#include <cstdint>
#include <limits>
 
namespace ccf
{
  using Node2NodeMsg = uint64_t;
 
  // Type of messages exchanged between nodes
  enum NodeMsgType : Node2NodeMsg
  {
    channel_msg = 0,
    consensus_msg,
    forwarded_msg
  };
  // NB: The node-to-node channels assume only 2 types of messages exist, and
  // treat them differently. Adding a new message type will likely need
  // additional changes.
 
  // Types of channel messages
  enum ChannelMsg : Node2NodeMsg
  {
    key_exchange_init = 0,
    key_exchange_response,
    key_exchange_final
  };
 
  // Types of frontend messages
  enum ForwardedMsg : Node2NodeMsg
  {
    forwarded_cmd_v1 = 0,
    forwarded_response_v1,
 
    // Includes a command_id, so that forwarded requests and responses can be
    // precisely correlated. Supported since 2.0.8, emitted since 3.0.0
    forwarded_cmd_v2,
    forwarded_response_v2,
 
    // Includes session consistency information:
    // - cmd contains view in which all session requests must execute
    // - response contains bool indicating that session should be closed
    forwarded_cmd_v3,
    forwarded_response_v3
  };
 
#pragma pack(push, 1)
  // Channel-specific header for key exchange
  struct ChannelHeader
  {
    ChannelMsg msg;
    NodeId from_node;
  };
 
  // Frontend-specific header for forwarding
  struct ForwardedHeader_v1
  {
    ForwardedMsg msg;
    ccf::FrameFormat frame_format = ccf::FrameFormat::http;
  };
 
  struct ForwardedHeader_v2 : public ForwardedHeader_v1
  {
    using ForwardedCommandId = size_t;
    ForwardedCommandId id;
  };
 
  struct ForwardedCommandHeader_v3 : public ForwardedHeader_v2
  {
    ForwardedCommandHeader_v3() = default;
    ForwardedCommandHeader_v3(
      ForwardedHeader_v2::ForwardedCommandId cmd_id, ccf::View view)
    {
      ForwardedHeader_v1::msg = ForwardedMsg::forwarded_cmd_v3;
      ForwardedHeader_v2::id = cmd_id;
      active_view = view;
    }
 
    // The view in which this session is being executed. For consistency, we
    // pessimistically close this session if the node is in any other view.
    ccf::View active_view;
  };
 
  struct ForwardedResponseHeader_v3 : public ForwardedHeader_v2
  {
    ForwardedResponseHeader_v3() = default;
    ForwardedResponseHeader_v3(
      ForwardedHeader_v2::ForwardedCommandId cmd_id, bool terminate)
    {
      ForwardedHeader_v1::msg = ForwardedMsg::forwarded_response_v3;
      ForwardedHeader_v2::id = cmd_id;
      terminate_session = terminate;
    }
 
    // If the response contains a fatal error, indicate to the original node
    // that the session should be terminated.
    bool terminate_session;
  };
 
  struct MessageHash
  {
    MessageHash() = default;
    MessageHash(ForwardedMsg msg_, ccf::crypto::Sha256Hash&& hash_) :
      msg(msg_),
      hash(std::move(hash_))
    {}
 
    ForwardedMsg msg;
    ccf::crypto::Sha256Hash hash;
  };
#pragma pack(pop)
 
  enum : ringbuffer::Message
  {
    DEFINE_RINGBUFFER_MSG_TYPE(associate_node_address),
 
    DEFINE_RINGBUFFER_MSG_TYPE(node_inbound),
 
    DEFINE_RINGBUFFER_MSG_TYPE(node_outbound),
 
    DEFINE_RINGBUFFER_MSG_TYPE(close_node_outbound)
  };
}
 
DECLARE_RINGBUFFER_MESSAGE_PAYLOAD(
  ccf::associate_node_address, ccf::NodeId::Value, std::string, std::string);
DECLARE_RINGBUFFER_MESSAGE_PAYLOAD(
  ccf::node_inbound,
  ccf::NodeMsgType,
  ccf::NodeId::Value,
  serializer::ByteRange);
DECLARE_RINGBUFFER_MESSAGE_PAYLOAD(
  ccf::node_outbound,
  ccf::NodeId::Value,
  ccf::NodeMsgType,
  ccf::NodeId::Value,
  serializer::ByteRange);
DECLARE_RINGBUFFER_MESSAGE_PAYLOAD(
  ccf::close_node_outbound, ccf::NodeId::Value);