refactor: Reorganize datamate-python (#34)

refactor: Reorganize datamate-python (previously label-studio-adapter) into a DDD style structure.

runtime/datamate-python/app/exception.py

@@ -0,0 +1,97 @@
+"""
+全局自定义异常类定义
+"""
+from fastapi.responses import JSONResponse
+from fastapi.exceptions import RequestValidationError
+from starlette.exceptions import HTTPException as StarletteHTTPException
+from fastapi import FastAPI, Request, HTTPException, status
+
+from .core.logging import setup_logging, get_logger
+
+logger = get_logger(__name__)
+
+# 自定义异常处理器：StarletteHTTPException (包括404等)
+async def starlette_http_exception_handler(request: Request, exc: StarletteHTTPException):
+    """将Starlette的HTTPException转换为标准响应格式"""
+    return JSONResponse(
+        status_code=exc.status_code,
+        content={
+            "code": exc.status_code,
+            "message": "error",
+            "data": {
+                "detail": exc.detail
+            }
+        }
+    )
+
+# 自定义异常处理器：FastAPI HTTPException
+async def fastapi_http_exception_handler(request: Request, exc: HTTPException):
+    """将FastAPI的HTTPException转换为标准响应格式"""
+    return JSONResponse(
+        status_code=exc.status_code,
+        content={
+            "code": exc.status_code,
+            "message": "error",
+            "data": {
+                "detail": exc.detail
+            }
+        }
+    )
+
+# 自定义异常处理器：RequestValidationError
+async def validation_exception_handler(request: Request, exc: RequestValidationError):
+    """将请求验证错误转换为标准响应格式"""
+    return JSONResponse(
+        status_code=422,
+        content={
+            "code": 422,
+            "message": "error",
+            "data": {
+                "detail": "Validation error",
+                "errors": exc.errors()
+            }
+        }
+    )
+
+# 自定义异常处理器：未捕获的异常
+async def general_exception_handler(request: Request, exc: Exception):
+    """将未捕获的异常转换为标准响应格式"""
+    logger.error(f"Unhandled exception: {exc}", exc_info=True)
+    return JSONResponse(
+        status_code=500,
+        content={
+            "code": 500,
+            "message": "error",
+            "data": {
+                "detail": "Internal server error"
+            }
+        }
+    )
+
+class LabelStudioAdapterException(Exception):
+    """Label Studio Adapter 基础异常类"""
+    pass
+
+class DatasetMappingNotFoundError(LabelStudioAdapterException):
+    """数据集映射未找到异常"""
+    def __init__(self, mapping_id: str):
+        self.mapping_id = mapping_id
+        super().__init__(f"Dataset mapping not found: {mapping_id}")
+
+class NoDatasetInfoFoundError(LabelStudioAdapterException):
+    """无法获取数据集信息异常"""
+    def __init__(self, dataset_uuid: str):
+        self.dataset_uuid = dataset_uuid
+        super().__init__(f"Failed to get dataset info: {dataset_uuid}")
+
+class LabelStudioClientError(LabelStudioAdapterException):
+    """Label Studio 客户端错误"""
+    pass
+
+class DMServiceClientError(LabelStudioAdapterException):
+    """DM 服务客户端错误"""
+    pass
+
+class SyncServiceError(LabelStudioAdapterException):
+    """同步服务错误"""
+    pass