move shell to separate thread

src/CatSession.hh

@@ -14,28 +14,41 @@
 #include "PSOEncryption.hh"
 #include "PSOProtocol.hh"
 #include "ServerState.hh"
-#include "Shell.hh"
 
-class CatSession : public Shell {
+class CatSession {
 public:
   CatSession(
       std::shared_ptr<struct event_base> base,
       const struct sockaddr_storage& remote,
       Version version,
       std::shared_ptr<const PSOBBEncryption::KeyFile> bb_key_file);
+  CatSession(const CatSession&) = delete;
+  CatSession(CatSession&&) = delete;
+  CatSession& operator=(const CatSession&) = delete;
+  CatSession& operator=(CatSession&&) = delete;
   virtual ~CatSession() = default;
 
 protected:
   PrefixedLogger log;
+  std::shared_ptr<struct event_base> base;
+  std::unique_ptr<struct event, void (*)(struct event*)> read_event;
+  Poll poll;
+
   Channel channel;
   std::shared_ptr<const PSOBBEncryption::KeyFile> bb_key_file;
 
-  virtual void print_prompt();
+  class exit_shell : public std::runtime_error {
+  public:
+    exit_shell();
+    ~exit_shell() = default;
+  };
+
   virtual void execute_command(const std::string& command);
 
-  static void dispatch_on_channel_input(
-      Channel& ch, uint16_t command, uint32_t flag, std::string& msg);
+  static void dispatch_read_stdin(evutil_socket_t fd, short events, void* ctx);
+  static void dispatch_on_channel_input(Channel& ch, uint16_t command, uint32_t flag, std::string& msg);
   static void dispatch_on_channel_error(Channel& ch, short events);
   void on_channel_input(uint16_t command, uint32_t flag, std::string& msg);
   void on_channel_error(short events);
+  void read_stdin();
 };