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我使用带有 boto API 的 python 来：

  1. 创建 sns、sqs 并将 sqs 队列订阅到 sns。
  2. 连接到 cloudwatch，并为“StatusCheckFailed”指标创建警报。
  3. 使用 put_metric_alarm 启动警报监控和通知。

我启动了一个我自己的 AMI 来模拟 StatusCheckFailed 条件。如果我转到 AWS 控制台>SQS，我可以看到我收到了警报通知。我也可以在 AWS 控制台中查看 JSON 格式的内容。

当我使用 python 和 SQS api 时，我可以：

  1. 查找队列 ( q = sqs.lookup(queue_name))
  2. 收到消息 ( msg = q.read())
  3. 获取消息正文 ( b = message.get_body_encoded())
  4. 或者message.get_body()

结果不可读。

  1. get_body_encoded给你一个没有任何分隔符的字符串。例如

    TypeNotificationMessageId02a8ce9dc21e55eaaeca83b5258563ffTopicArnarnawssnsuswest21888888879statuscheckalarm17122223479SubjectStatusCheckAlarmbadvmstatusalarminUSWest2MessageAlarmNamebadvmstatusalarmAlarmDescriptionstatuscheckfori50602c5abadvmAWSAccountId11233333333NewStateValueALARMNewStateReasonThresholdCross....`

  2. get_body让你无法阅读编码。

如何获取 JSON 格式的消息正文，例如 AWS 控制台的 SQS 部分中显示的消息正文？

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2 回答 2

3

的结果get_body()返回 JSON 格式的字符串。

我通过创建 SQS 队列和 SNS 通知主题重新创建了您的情况，将 SQS 队列订阅到 SNS 主题，然后创建了一个将通知推送到 SNS 主题的警报。然后我触发了警报情况并通过 Python 检索了结果：

$ python
Python 2.6.9 (unknown, Sep 13 2014, 00:25:11) 
[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import boto, boto.sqs
>>> from boto.sqs.message import Message
>>> q_conn = boto.sqs.connect_to_region("ap-southeast-2")
>>> q = q_conn.get_queue('bob')
>>> m = q.read(visibility_timeout=15)
>>> m.get_body()
u'{\n  "Type" : "Notification",\n  "MessageId" : "adcad528-680b-5b4f-88bd-98432f1bf252",\n  "TopicArn" : "arn:aws:sns:ap-southeast-2:123412341234:bob-topic",\n  "Subject" : "ALARM: \\"my-alarm-name\\" in APAC - Sydney",\n  "Message" : "{\\"AlarmName\\":\\"my-alarm-name\\",\\"AlarmDescription\\":\\"my-alarm-description\\",\\"AWSAccountId\\":\\"123412341234\\",\\"NewStateValue\\":\\"ALARM\\",\\"NewStateReason\\":\\"Threshold Crossed: 1 datapoint (1459.0) was greater than or equal to the threshold (0.0).\\",\\"StateChangeTime\\":\\"2015-01-11T00:33:20.013+0000\\",\\"Region\\":\\"APAC - Sydney\\",\\"OldStateValue\\":\\"INSUFFICIENT_DATA\\",\\"Trigger\\":{\\"MetricName\\":\\"NetworkIn\\",\\"Namespace\\":\\"AWS/EC2\\",\\"Statistic\\":\\"SUM\\",\\"Unit\\":null,\\"Dimensions\\":[{\\"name\\":\\"InstanceId\\",\\"value\\":\\"i-af41ec91\\"}],\\"Period\\":60,\\"EvaluationPeriods\\":1,\\"ComparisonOperator\\":\\"GreaterThanOrEqualToThreshold\\",\\"Threshold\\":0.0}}",\n  "Timestamp" : "2015-01-11T00:33:20.072Z",\n  "SignatureVersion" : "1",\n  "Signature" : "(removed)",\n  "SigningCertURL" : "(removed)",\n  "UnsubscribeURL" : "https://sns.ap-southeast-2.amazonaws.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:ap-southeast-2:123412341234:bob-topic:9bc1234c-1234-4995-927a-72b752866e5e"\n}'

响应get_body()是一个包含 JSON 的字符串。这可以使用 JSON 库进行解析：

>>> message_string = json.loads(m.get_body())['Message']
>>> message_string
u'{"AlarmName":"my-alarm-name","AlarmDescription":"my-alarm-description","AWSAccountId":"123412341234","NewStateValue":"ALARM","NewStateReason":"Threshold Crossed: 1 datapoint (1459.0) was greater than or equal to the threshold (0.0).","StateChangeTime":"2015-01-11T00:33:20.013+0000","Region":"APAC - Sydney","OldStateValue":"INSUFFICIENT_DATA","Trigger":{"MetricName":"NetworkIn","Namespace":"AWS/EC2","Statistic":"SUM","Unit":null,"Dimensions":[{"name":"InstanceId","value":"i-af41ec91"}],"Period":60,"EvaluationPeriods":1,"ComparisonOperator":"GreaterThanOrEqualToThreshold","Threshold":0.0}}'
>>> message = json.loads(message_string)
>>> message['AlarmName']
u'my-alarm-name'
于 2015-01-11T00:55:06.110 回答
1

我在 AWS 论坛上读过类似的，它对我有用。

如果您知道消息不会采用 base64 编码，则可以更改从队列中读取消息的代码，使其不会尝试解码消息，如下所示： sqs = boto.connect_sqs() queue = sqs .get_queue('myqueue') queue.set_message_class(boto.sqs.message.RawMessage)

于 2015-01-08T23:53:14.597 回答