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"""Common utilities."""
import logging
import traceback
from typing import Callable
from flask import request, Response, make_response, render_template
logger = logging.getLogger(__name__)
def add_trace(exc: Exception, errobj: dict) -> dict:
"""Add the traceback to the error handling object."""
return {
**errobj,
"error-trace": "".join(traceback.format_exception(exc))
}
def __status_code__(exc: Exception):
"""Fetch the error code for exceptions that have them."""
error_code_attributes = (
"code", "error_code", "errorcode", "status_code", "status_code")
for attr in error_code_attributes:
if hasattr(exc, attr):
return getattr(exc, attr)
return 500
def build_handler(description: str) -> Callable[[Exception], Response]:
"""Generic utility to build error handlers."""
def __handler__(exc: Exception) -> Response:
"""Handle the exception as appropriate for requests of different mimetypes."""
error = (exc.name if hasattr(exc, "name") else exc.__class__.__name__)
status_code = __status_code__(exc)
content_type = request.content_type
if bool(content_type) and content_type.lower() == "application/json":
return make_response((
add_trace(
exc,
{
"requested-uri": request.url,
"error": error,
"error_description": description
}),
status_code,
{"Content-Type": "application/json"}))
return make_response((
render_template(
f"http-error-{str(status_code)[0:-2]}xx.html",
error=exc,
page=request.url,
description=description,
trace=traceback.format_exception(exc)),
status_code,
{"Content-Type": "text/html"}))
return __handler__
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