[英]Python AWS function failing to return ELB data through Lambda - works on console
This should be simple so I'm hoping some can help with this quite quickly. 这应该很简单,所以我希望一些人可以很快提供帮助。
I have the following basic python script: 我有以下基本的python脚本:
import boto3
elb = boto3.client('elb')
print(elb.describe_load_balancers())
When I execute this via a python script on the command line it works perfectly, returning all information for all load balancers. 当我在命令行上通过python脚本执行此操作时,它可以完美运行,返回所有负载平衡器的所有信息。
The CLI command also works perfectly from the command line: CLI命令也可以从命令行完美运行:
aws elb describe-load-balancers
However when I add the script into AWS's Lambda function it fails. 但是,当我将脚本添加到AWS的Lambda函数中时,它将失败。 This is how the script looks in AWS lambda: 这是该脚本在AWS lambda中的外观:
import boto3
def lambda_handler(event, context):
elb = boto3.client('elb')
return elb.describe_load_balancers()
Which should work like the others returning all the load balancers data, however it returns this error: 应该像其他返回所有负载均衡器数据一样工作,但是会返回此错误:
{
"stackTrace": [
[
"/usr/lib64/python2.7/json/__init__.py",
250,
"dumps",
"sort_keys=sort_keys, **kw).encode(obj)"
],
[
"/usr/lib64/python2.7/json/encoder.py",
207,
"encode",
"chunks = self.iterencode(o, _one_shot=True)"
],
[
"/usr/lib64/python2.7/json/encoder.py",
270,
"iterencode",
"return _iterencode(o, 0)"
],
[
"/var/runtime/awslambda/bootstrap.py",
41,
"decimal_serializer",
"raise TypeError(repr(o) + \" is not JSON serializable\")"
]
],
"errorType": "TypeError",
"errorMessage": "datetime.datetime(2013, 7, 26, 15, 35, 57, 690000, tzinfo=tzlocal()) is not JSON serializable"
}
I have been pulling my hair out all day with this so far and can't work out what is wrong, so any help would be appreciated. 到目前为止,我整天都在拉头发,无法找出问题所在,因此我们将不胜感激。
As an extra note I was able to get this function working in AWS lambda just fine: 需要特别注意的是,我能够在AWS lambda中使此功能正常工作:
import boto3
def lambda_handler(event, context):
elb = boto3.client('elb')
return elb.describe_tags(LoadBalancerNames=[event['loadBalancer']])
As you may notice in the above command I have specifed the load balancer instead of all of them, I have tried this with the other function too but with no luck. 如您在上面的命令中可能注意到的,我指定了负载均衡器而不是全部负载均衡器,我也尝试了使用其他功能,但是没有运气。
I was digging same references with Jim.P's and trying on my account. 我正在与Jim.P一起检索相同的参考文献,并尝试使用我的帐户。 this answer gave me the correct result with proper implementation: 这个答案通过正确的实施为我提供了正确的结果:
import boto3
import json
import datetime
from time import mktime
class MyEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, datetime.datetime):
return int(mktime(obj.timetuple()))
return json.JSONEncoder.default(self, obj)
def lambda_handler(event, context):
elb = boto3.client('elb')
return json.dumps(elb.describe_load_balancers(), cls = MyEncoder)
This looks like it may be "python" specific, and the reason it probably works on your local machine is you have a python library that is not included in your lambda function. 看起来它可能是特定于“ python”的,并且它可能在本地计算机上工作的原因是您有一个lambda函数未包含的python库。
Several articles describing your error: 多篇描述您的错误的文章:
StackOverflow - 455580 StackOverflow-455580
StackOverflow - 11875770 StackOverflow-11875770
And documentation on creating a deployment package for Lambda Python: 以及有关为Lambda Python创建部署程序包的文档:
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