flask error handler

Author: binderclip

frameworks/flask_snippets/errorhandler_app/app.py

@@ -1,4 +1,4 @@
-from flask import Flask
+from flask import Flask, abort
 app = Flask(__name__)
 
 
@@ -9,11 +9,45 @@ def app_404(e):
     return 'page not found', 404
 
 
+@app.errorhandler(500)
+def app_500(e):
+    print(e)
+    print(type(e))
+    return 'page error', 500
+
+
+@app.errorhandler(ZeroDivisionError)
+def app_500(e):
+    print(e)
+    print(type(e))
+    return 'ZeroDivisionError', 500
+
+
+@app.errorhandler(ZeroDivisionError)
+def app_500(e):
+    print(e)
+    print(type(e))
+    return 'ZeroDivisionError', 500
+
+
+
 @app.route("/")
 def hello():
     return "Hello World!"
 
 
+@app.route("/500")
+def error_500():
+    a = 100 / 0
+    return f'hello {a}'
+
+
+@app.route("/r500")
+def error_r500():
+    abort(500)
+    return 'hello'
+
+
 def main():
     app.run(debug=True)
 

frameworks/flask_snippets/errorhandler_app/app2.py

@@ -0,0 +1,41 @@
+from flask import Flask, abort, jsonify
+from werkzeug.exceptions import HTTPException, default_exceptions
+
+app = Flask('test')
+
+
+@app.errorhandler(Exception)
+def handle_error(e):
+    code = 500
+    if isinstance(e, HTTPException):
+        code = e.code
+    return jsonify(error=str(e)), code
+
+
+for ex in default_exceptions:
+    app.register_error_handler(ex, handle_error)
+
+
+@app.route('/')
+def index():
+    return 'hello world'
+
+
+@app.route("/500")
+def error_500():
+    a = 100 / 0
+    return f'hello {a}'
+
+
+@app.route("/r500")
+def error_r500():
+    abort(500)
+    return 'hello'
+
+
+def main():
+    app.run(debug=True)
+
+
+if __name__ == '__main__':
+    main()

frameworks/flask_snippets/errorhandler_app/app3.py

@@ -0,0 +1,53 @@
+from functools import wraps
+
+from flask import Flask, abort, jsonify
+from werkzeug.exceptions import HTTPException
+
+app = Flask(__name__)
+
+
+@app.errorhandler(Exception)
+def handle_error(e):
+    code = 500
+    if isinstance(e, HTTPException):
+        code = e.code
+    return jsonify(error=str(e)), code
+
+
+def get_http_exception_handler(app):
+    """Overrides the default http exception handler to return JSON."""
+    handle_http_exception = app.handle_http_exception
+    @wraps(handle_http_exception)
+    def ret_val(exception):
+        exc = handle_http_exception(exception)
+        return jsonify(error=exc.description), exc.code
+    return ret_val
+
+
+# Override the HTTP exception handler.
+app.handle_http_exception = get_http_exception_handler(app)
+
+
+@app.route('/')
+def index():
+    return 'hello world'
+
+
+@app.route("/500")
+def error_500():
+    a = 100 / 0
+    return f'hello {a}'
+
+
+@app.route("/r500")
+def error_r500():
+    abort(500)
+    return 'hello'
+
+
+def main():
+    app.run(debug=True)
+
+
+if __name__ == '__main__':
+    main()

frameworks/flask_snippets/errorhandler_app/readme.md

@@ -0,0 +1,5 @@
+## refs
+
+- [python - Global error handler for any exception - Stack Overflow](https://stackoverflow.com/questions/29332056/global-error-handler-for-any-exception)
+- [blueprint error handler not working?? · Issue #1935 · pallets/flask](https://github.com/pallets/flask/issues/1935)
+- [Allow blueprint-local routing for errorhandlers · Issue #503 · pallets/flask](https://github.com/pallets/flask/issues/503)