我的Bottle应用程序不是非常干燥，这是一个测试用例：
from uuid import uuid4
from bottle import Bottle, response
foo_app = Bottle()
@foo_app.post('/foo')
def create():
if not request.json:
response.status = 400
return {'error': 'ValidationError', 'error_message': 'Body required'}
body = request.json
body.update({'id': uuid4().get_hex())
# persist to db
# ORM might set 'id' on the Model layer rather than setting it here
# ORM will validate, as will db, so wrap this in a try/catch
response.status = 201
return body
@foo_app.put('/foo/<id>')
def update(id):
if not request.json:
response.status = 400
return {'error': 'ValidationError', 'error_message': 'Body required'}
elif 'id' not in request.json:
response.status = 400
return {'error': 'ValidationError', 'error_message': '`id` required'}
db = {} # should be actual db cursor or whatever
if 'id' not in db:
response.status = 404
return {'error': 'Not Found',
'error_message': 'Foo `id` "{id}" not found'.format(id)}
body = request.json
# persist to db, return updated object
# another try/catch here in case of update error (from ORM and/or db)
return body
解决此问题的一种方法是拥有全局错误处理程序，并在各处引发错误。
另一个是使用装饰器，它也有开销问题。
有没有更好的方法来进行每条路线的验证？-我在想类似的东西：
foo_app.post('/foo', middleware=[HAS_BODY_F, ID_IN_DB_F])
最终找到了Bottle的内置“中间件”，称为“插件”（参考）：
from bottle import Bottle, request, response
app = Bottle()
def has_body(f):
def inner(*args, **kwargs):
if request.json:
return f(*args, **kwargs)
response.status = 400
return {'error': 'ValidationError',
'error_message': 'Body is required (and must be JSON).'}
return inner
def body_req(required):
def body_req_middleware(f):
def inner(*args, **kwargs):
intersection = required.intersection(set(request.json.keys()))
if intersection != required:
response.status = 400
return {'error': 'ValidationError',
'error_message': 'Key(s): {} are not in JSON payload'
''.format(', '.join('{!r}'.format(k)
for k in required - intersection))}
return f(*args, **kwargs)
return inner
return body_req_middleware
@app.post('/foo', apply=(has_body, body_req({'id', 'f'})))
def get_foo():
return {'foo': 'bar'}
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我来说两句