build: Flatten project structure

This change updates the project structure to become flattened. 
Previously, the simulator, frontend and API each lived into their own directory. 

With this change, all modules of the project live in the top-level directory of 
the repository.

1 files changed, 64 insertions, 0 deletions

diff --git a/opendc-web/opendc-web-api/opendc/util/exceptions.py b/opendc-web/opendc-web-api/opendc/util/exceptions.py
new file mode 100644
index 00000000..7724a407
--- /dev/null
+++ b/opendc-web/opendc-web-api/opendc/util/exceptions.py
@@ -0,0 +1,64 @@
+class RequestInitializationError(Exception):
+    """Raised when a Request cannot successfully be initialized"""
+
+
+class UnimplementedEndpointError(RequestInitializationError):
+    """Raised when a Request path does not point to a module."""
+
+
+class MissingRequestParameterError(RequestInitializationError):
+    """Raised when a Request does not contain one or more required parameters."""
+
+
+class UnsupportedMethodError(RequestInitializationError):
+    """Raised when a Request does not use a supported REST method.
+
+    The method must be in all-caps, supported by REST, and implemented by the module.
+    """
+
+
+class AuthorizationTokenError(RequestInitializationError):
+    """Raised when an authorization token is not correctly verified."""
+
+
+class ForeignKeyError(Exception):
+    """Raised when a foreign key constraint is not met."""
+
+
+class RowNotFoundError(Exception):
+    """Raised when a database row is not found."""
+    def __init__(self, table_name):
+        super(RowNotFoundError, self).__init__('Row in `{}` table not found.'.format(table_name))
+
+        self.table_name = table_name
+
+
+class ParameterError(Exception):
+    """Raised when a parameter is either missing or incorrectly typed."""
+
+
+class IncorrectParameterError(ParameterError):
+    """Raised when a parameter is of the wrong type."""
+    def __init__(self, parameter_name, parameter_location):
+        super(IncorrectParameterError,
+              self).__init__('Incorrectly typed `{}` {} parameter.'.format(parameter_name, parameter_location))
+
+        self.parameter_name = parameter_name
+        self.parameter_location = parameter_location
+
+
+class MissingParameterError(ParameterError):
+    """Raised when a parameter is missing."""
+    def __init__(self, parameter_name, parameter_location):
+        super(MissingParameterError,
+              self).__init__('Missing required `{}` {} parameter.'.format(parameter_name, parameter_location))
+
+        self.parameter_name = parameter_name
+        self.parameter_location = parameter_location
+
+
+class ClientError(Exception):
+    """Raised when a 4xx response is to be returned."""
+    def __init__(self, response):
+        super(ClientError, self).__init__(str(response))
+        self.response = response