[feat] add basic domain & usecase

domain/error.py

@@ -16,3 +16,19 @@ class UserConflictError(UserError):
     def __init__(self, email: str) -> None:
         super().__init__('user_conflict')
         self.email = email
+
+
+class SandboxError(DomainError):
+    pass
+
+
+class SandboxStartError(SandboxError):
+    def __init__(self, chat_id: str) -> None:
+        super().__init__('sandbox_start_failed')
+        self.chat_id = chat_id
+
+
+class SandboxAlreadyRunningError(SandboxError):
+    def __init__(self, chat_id: str) -> None:
+        super().__init__('sandbox_already_running')
+        self.chat_id = chat_id

domain/sandbox.py

@@ -0,0 +1,21 @@
+from dataclasses import dataclass
+from datetime import datetime
+from enum import Enum
+
+
+class SandboxStatus(str, Enum):
+    STARTING = 'starting'
+    RUNNING = 'running'
+    STOPPING = 'stopping'
+    STOPPED = 'stopped'
+    FAILED = 'failed'
+
+
+@dataclass(frozen=True, slots=True)
+class SandboxSession:
+    session_id: str
+    chat_id: str
+    container_id: str
+    status: SandboxStatus
+    created_at: datetime
+    expires_at: datetime