我正在尝试使用带有python的Xively API来更新数据流,但偶尔会出现504错误,这似乎结束了我的脚本。
我怎样才能捕捉到这个错误,更重要的是延迟并重试,以便脚本可以继续运行并在一分钟左右后上载我的数据?
这是我上传的地方。
# Upload to Xivity
api = xively.XivelyAPIClient("[MY_API_KEY")
feed = api.feeds.get([MY_DATASTREAM_ID])
now = datetime.datetime.utcnow()
feed.datastreams = [xively.Datastream(id='temps', current_value=tempF, at=now)]
feed.update()
下面是脚本失败时记录的错误:
Traceback (most recent call last):
File "C:\[My Path] \ [My_script].py", line 39, in <module>
feed = api.feeds.get([MY_DATASTREAM_ID])
File "C:\Python34\lib\site-packages\xively_python-0.1.0_rc2-py3.4.egg\xively\managers.py", >line 268, in get
response.raise_for_status()
File "C:\Python34\lib\site-packages\requests-2.3.0-py3.4.egg\requests\models.py", line 795, >in raise_for_status
raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 504 Server Error: Gateway Time-out
谢谢,
另外,我已经用[我的信息]替换了我的个人信息,但是很明显正确的数据出现在我的代码中。
最佳答案
我通常用一个装饰工来做这个:
from functools import wraps
from requests.exceptions import HTTPError
import time
def retry(func):
""" Call `func` with a retry.
If `func` raises an HTTPError, sleep for 5 seconds
and then retry.
"""
@wraps(func)
def wrapper(*args, **kwargs):
try:
ret = func(*args, **kwargs)
except HTTPError:
time.sleep(5)
ret = func(*args, **kwargs)
return ret
return wrapper
或者,如果要重试多次:
def retry_multi(max_retries):
""" Retry a function `max_retries` times. """
def retry(func):
@wraps(func)
def wrapper(*args, **kwargs):
num_retries = 0
while num_retries <= max_retries:
try:
ret = func(*args, **kwargs)
break
except HTTPError:
if num_retries == max_retries:
raise
num_retries += 1
time.sleep(5)
return ret
return wrapper
return retry
然后将代码放入这样的函数中
#@retry
@retry_multi(5) # retry 5 times before giving up.
def do_call():
# Upload to Xivity
api = xively.XivelyAPIClient("[MY_API_KEY")
feed = api.feeds.get([MY_DATASTREAM_ID])
now = datetime.datetime.utcnow()
feed.datastreams = [xively.Datastream(id='temps', current_value=tempF, at=now)]
feed.update()