[UPD] Exception handling

app/controller/__init__.py

@@ -1,10 +1,17 @@
 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
+from sqlalchemy.exc import IntegrityError
 
 from app.api.cruds.base import create, read, update, delete, read_all
 from app.schema.library import Library
 from ..db.config.config import get_engine_configuration
 
+from sqlalchemy.exc import NoResultFound
+
+from .exceptions import LibraryCreationException
+from .exceptions import LibraryReadException
+from .exceptions import LibraryUpdateException
+
 import logging
 logging.basicConfig(level=logging.DEBUG)
 logger = logging.getLogger(__name__)
@@ -65,21 +72,46 @@ class LibraryController:
             return True
         return False
 
+    #CRUDS
     def create(self, library:Library):
+        try:
             self._library = create(self.session, library)
+        except IntegrityError as e:
+            raise LibraryCreationException(
+                "Cannot create library",
+                f"{e.orig}", 
+                "library",
+                str(library)
+            )
         return self
     
     def read(self, _id):
+        try:
             self._library = read(self.session, _id, Library)
+        except NoResultFound as e:
+            raise LibraryReadException(
+                f"Cannot read Library with id {_id}",
+                f"{e}", 
+                "library",
+                _id
+            )
         return self
     
     def read_all(self):
         self._libraries = read_all(self.session, Library)
         
     def update(self):
+        try:
             self.session.commit()
+        except IntegrityError as e:
+            raise LibraryUpdateException(
+                f"Cannot update Library",
+                f"{e}", 
+                "library",
+                None
+            )
 
     def delete(self):
-        delete(self.session, self)
+        delete(self.session, self.data)
         del(self)
 

app/controller/exceptions/__init__.py

@@ -0,0 +1,5 @@
+from .base import LibraryExceptionBase
+from .exc_01000X_data import LibraryDataExection
+from .exc_01001X_create import LibraryCreationException
+from .exc_01002X_read import LibraryReadException
+from .exc_01003X_update import LibraryUpdateException

app/controller/exceptions/base.py

@@ -0,0 +1,26 @@
+class LibraryExceptionBase(Exception):
+    def __init__(self, name, error, object_name, data, *, status_code=400):
+        self.code = "000000"
+        self.name = name
+        self.error = error
+        self.object = object_name
+        self.data = data
+        self.status_code = status_code
+    
+    def to_dict(self):
+        return {
+            "status": "error",
+            "name": self.name,
+            "code": self.code,
+            "error": self.error,
+            "object": self.object,
+            "data": self.data,
+            "status_code": self.status_code
+        }
+    
+    def __str__(self):
+        return f"ERROR {self.code}: {self.error}"
+    
+    def __repr__(self):
+        return f"{self.__class__}(code={self.code!r}, error={self.error!r}), " \
+               f"object={self.object!r}, data={self.data!r}, status_code={self._status_code})"

app/controller/exceptions/exc_01000X_data.py

@@ -0,0 +1,7 @@
+from .base import LibraryExceptionBase
+
+#010010
+class LibraryDataExection(LibraryExceptionBase):
+    def __init__(self, name, error, object_name, data, *, status_code=400):
+        self.code = "010000"
+        super().__init__(name, error, object_name, data, status_code=status_code)

app/controller/exceptions/exc_01001X_create.py

@@ -0,0 +1,7 @@
+from .base import LibraryExceptionBase
+
+#010010
+class LibraryCreationException(LibraryExceptionBase):
+    def __init__(self, name, error, object_name, data, *, status_code=400):
+        self.code = "010010"
+        super().__init__(name, error, object_name, data, status_code=status_code)

app/controller/exceptions/exc_01002X_read.py

@@ -0,0 +1,7 @@
+from .base import LibraryExceptionBase
+
+#010030
+class LibraryReadException(LibraryExceptionBase):
+    def __init__(self, name, error, object_name, data, status_code=404):
+        super().__init__(name, error, object_name, data, status_code=status_code)
+        self.code = "010030"

app/controller/exceptions/exc_01003X_update.py

@@ -0,0 +1,7 @@
+from .base import LibraryExceptionBase
+
+#010020
+class LibraryUpdateException(LibraryExceptionBase):
+    def __init__(self, name, error, object_name, data, status_code=404):
+        super().__init__(name, error, object_name, data, status_code=status_code)
+        self.code = "010020"

app/controller/functions/__init__.py

@@ -0,0 +1 @@
+from .update_item_key import update_item_key

app/controller/functions/update_item_key.py

@@ -0,0 +1,21 @@
+from ..exceptions import LibraryDataExection
+from ...schema.library import Base
+
+def update_item_key(obj:Base, key, value):
+    if key == "id":
+        raise LibraryDataExection(
+            "id is not updatable",
+            "The key ID is not Updatable",
+            obj.__class__,
+            {key: value}
+        )
+    try:
+        obj.__getattribute__(key)
+    except AttributeError:
+        raise LibraryDataExection(
+            f"{key} not in {obj.__class__}",
+            f"The key {key} is not in {obj.__class__}",
+            obj.__class__,
+            {key: value}
+        )
+    obj.__setattr__(key, value)

app/routes/__init__.py

@@ -1 +1,40 @@
+from flask import json, make_response
+from werkzeug.exceptions import HTTPException
+
 from .api import api
+from ..controller.exceptions import LibraryExceptionBase
+
+@api.errorhandler(LibraryExceptionBase)
+def handle_exception(e):
+    """Return JSON instead of HTML for HTTP errors."""
+    # start with the correct headers and status code from the error
+    response = make_response()
+    # replace the body with JSON
+    response.data = json.dumps({
+        "status": "error",
+        "code": e.code,
+        "status_code": e.status_code,
+        "name": e.name,
+        "error": e.error,
+        "data": e.data
+    })
+    response.content_type = "application/json"
+    response.status_code = e.status_code
+    return response
+
+@api.errorhandler(HTTPException)
+def handle_exception(e):
+    """Return JSON instead of HTML for HTTP errors."""
+    # start with the correct headers and status code from the error
+    response = e.get_response()
+    # replace the body with JSON
+    response.data = json.dumps({
+        "status": "error",
+        "code": f"000{e.code}",
+        "status_code": e.code,
+        "name": e.name,
+        "error": e.description,
+    })
+    response.content_type = "application/json"
+    return response
+

app/routes/api/library/create.py

@@ -1,5 +1,4 @@
 from flask import request
-from sqlalchemy.exc import IntegrityError
 
 from .blueprint import api_library
 
@@ -11,18 +10,10 @@ logger = logging.getLogger(__name__)
 
 @api_library.route("/", methods=["POST"])
 def create_library():
-    try:
+    
     data = request.json
-    except Exception as e:
-        logger.debug(f"{e}")
-        return { "status": "error", "error": "JSON Required" }, 415 
     
     with LibraryController() as controller:
-        try:
         lib = Library(**data)
         library = controller.create(lib)
-        except IntegrityError as e:
-            logger.debug(f"DB Error Creating {e}")
-            return { "status": "error", "error": f"{e.orig}" }, 400
-        else:     
         return { "status": "ok", "result": library.data.to_dict() }, 200

app/routes/api/library/delete.py

@@ -12,11 +12,7 @@ logger = logging.getLogger(__name__)
 @api_library.route("/<_id>", methods=["DELETE"])
 def delete_library(_id):
 
-    try: # TODO: function
     controller = LibraryController(_id)
-    except NoResultFound as e:
-        logger.debug({e})
-        return { "status": "error", "error": "Library not found" }, 404
     
     controller.delete()
      

app/routes/api/library/read.py

@@ -17,11 +17,5 @@ def read_libraries():
 
 @api_library.route("/<_id>", methods=["GET"])
 def read_library(_id):
-    try:
     library = LibraryController(_id)
-    except NoResultFound as e:
-        logger.debug(f"No result found for Library wid id {_id}")
-        logger.debug(f"Error {e}")
-        logger.debug(f"Error {dir(e)}")
-        return { "status": "error", "result": "Library not found"}, 404
     return { "status": "ok", "result": library.data.to_dict() }, 200

app/routes/api/library/update.py

@@ -4,47 +4,24 @@ from sqlalchemy.exc import IntegrityError, NoResultFound
 from .blueprint import api_library
 
 from ....controller import LibraryController
+from ....controller.functions import update_item_key
 from ....schema.library.library import Library
 
 import logging
 logger = logging.getLogger(__name__)
 
-def update_library_item(library:Library, key, value):
-    if key == "id":
-        raise AttributeError("id is not updatable")
-    try:
-        library.__getattribute__(key)
-    except AttributeError:
-        raise AttributeError(f"{key} not in library")
-    library.__setattr__(key, value)
+
 
 @api_library.route("/<_id>", methods=["PATCH"])
 def update_library(_id):
-    try:
-        data:dict = request.json
-        logger.debug(f"data: {data}")
-    except Exception as e:
-        logger.debug(f"{e}")
-        return { "status": "error", "error": "JSON Required" }, 415
  
-    try: # TODO: function
+    data:dict = request.json
     controller = LibraryController(_id)
-    except NoResultFound as e:
-        logger.debug({e})
-        return { "status": "error", "error": "Library not found" }, 404
    
     library = controller.data
     for key, value in data.items():
-        try:
-            update_library_item(library, key, value)
-        except AttributeError as e:
-            logger.debug(f"Error updating {e}")
-            return { "status": "error", "error": e.name }
+        update_item_key(library, key, value)
 
-    try:
     controller.update()
-    except IntegrityError as e:
-        logger.debug(f"DB Error Creating {e}")
-        return { "status": "error", "error": f"{e.orig}" }, 400
-    else:     
+
     return { "status": "ok", "result": controller.data.to_dict() }, 200

config.ini

@@ -3,5 +3,5 @@ query = sqlite:///test.db
 
 [App]
 port = 15012
-debug = False
+debug = True
 

main.py

@@ -1,4 +1,4 @@
-__version__ = "0.2.0.dev"
+
 
 from app import app
 from app.config import config

tests/test_controller.py

@@ -1,17 +1,19 @@
 import os
 import unittest
 
-from sqlalchemy.orm import sessionmaker
+from sqlalchemy.exc import NoResultFound
 
 from app.api.actions import install
 from app.schema.library import Library, Tag, Book, BookTag, Path, Env
 from app.controller import LibraryController
 
+from app.controller.exceptions import LibraryReadException
+
 import logging
 logging.basicConfig(level=logging.DEBUG)
 logger = logging.getLogger(__name__)
 
-class TestDB(unittest.TestCase):
+class TestController(unittest.TestCase):
 
     def setUp(self):
         os.environ["DEV_URIA_BIBLIOGAME_CONFIG_DB"] = "sqlite:///"
@@ -137,6 +139,11 @@ class TestDB(unittest.TestCase):
         self.assertNotEqual(book.name, "Test book")
         self.assertEqual(book.name, "Another Book on the shelf")
 
+    def test_delete_library(self):
+        library = LibraryController(1, engine=self.engine)
+        library.delete()
+
+        self.assertRaises(LibraryReadException, LibraryController, 1, engine=self.engine)    
         
 if __name__ == "__main__":
     unittest.main()

tests/test_db.py

@@ -2,11 +2,13 @@ import os
 import unittest
 
 from sqlalchemy.orm import sessionmaker
+from sqlalchemy.exc import NoResultFound
 
 from app.api.actions import install
-from app.api.cruds.base import create, read, update
+from app.api.cruds.base import create, read, update, delete
 from app.schema.library import Library, Path, Env, Book, Tag, BookTag
 
+
 import logging
 logging.basicConfig(level=logging.DEBUG)
 logger = logging.getLogger(__name__)
@@ -137,6 +139,12 @@ class TestDB(unittest.TestCase):
         self.assertNotEqual(book.name, "Test book")
         self.assertEqual(book.name, "Another Book on the shelf")
 
+    def test_delete_library(self):
+        library = read(self.session, 1, Library)
+        delete(self.session, library)
+
+        self.assertRaises(NoResultFound, read, self.session, 1, Library)
+
         
 if __name__ == "__main__":
     unittest.main()