和网络相关，偏底层的处理。

• 事件处理

Update

// update some common properties quickly

set_timeout

// sets  timeout based on connection state, so as stale connections are cleared quickly
// if these timeouts are met connection is closed

Exit

// marks connection as exit in progress

IsExitInProgress

Send_Message

Send_Message_prelocked

// used when we have command queue
// assumingin peer lock has already been taken

Read_Data_Frame

// reads our data, length prefix blocks

Handle_Connection

开始从外部网络，过渡到内核。

// handles both server and client connections

Handle_Handshake

Handle_TimedSync

Handle_ChainRequest
Handle_ChainResponse

Handle_ObjectRequest
Handle_ObjectResponse

Handle_Notification_Block
Handle_Notification_Transaction

目前支持的事件处理：

• V2_COMMAND_HANDSHAKE
• V2_COMMAND_SYNC
• V2_COMMAND_CHAIN_REQUEST
• V2_COMMAND_CHAIN_RESPONSE
• V2_COMMAND_OBJECTS_REQUEST
• V2_COMMAND_OBJECTS_RESPONSE
• V2_NOTIFY_NEW_BLOCK
• V2_NOTIFY_NEW_TX