我在python-eve应用程序中有一些代码,它从设备检索一些数据,并在第一次请求该资源时填充资源。有时代码无法成功连接到设备。在这种情况下,我想返回一条更好地解释这一点的错误消息,而不仅仅是一个普通的500错误。这是on_fetch_item钩子:
def before_returning_item(resource, _id, document):
if resource == "switches":
if "interfaces" not in document.keys():
# retrieve and store switch config if it hasn't been stored yet
r = app.data.driver.db[resource]
try:
switch = prepare_switch_from_document(document)
except socket.timeout:
# raise some more meaningful error with message
pass
interface_list = switch.get_formatted_interfaces()
r.update({'_id': _id}, {'interfaces': interface_list})
document['interfaces'] = interface_list
app.on_fetch_item += before_returning_item
提前致谢。
答案 0 :(得分:4)
您所要做的就是利用Flask的abort
方法:
from flask import abort
def before_returning_item(resource, _id, document):
if resource == "switches":
if "interfaces" not in document.keys():
# retrieve and store switch config if it hasn't been stored yet
r = app.data.driver.db[resource]
try:
switch = prepare_switch_from_document(document)
except socket.timeout:
# raise some more meaningful error with message
abort(500)
interface_list = switch.get_formatted_interfaces()
r.update({'_id': _id}, {'interfaces': interface_list})
document['interfaces'] = interface_list
app.on_fetch_item += before_returning_item
如果您想添加自定义说明:
abort(500, description='My custom abort description')
答案 1 :(得分:-1)
我喜欢创建自定义异常,并提出具有意义注释的异常,例如:
class MyExcept(Exception): pass
def before_returning_item():
...
if error_condition:
raise MyException('detailed explanation')
...
try:
before_returning_item()
except MyException, exc:
if 'device not ready' in str(exc):
print("Device was not rdy...Try agin?")
else:
raise