python - 在 Python 上使用 describe_alarms 从 AWS 返回所有警报而不是仅返回 50 个

Question

在使用 describe_alarms 函数时，如何打印所有警报名称，而不是仅打印 50 个？

代码，使用 Python:

conn = boto.connect_cloudwatch()
alarms = conn.describe_alarms()    
for item in alarms:
    print item.name

谢谢。

Answer 1

虽然我来晚了一点，但这是我的解决方案(用 Java)。您必须获取下一个 token 并在循环中不断询问结果，直到没有下一个 token 为止，因此它的行为类似于网站上的分页

String nextToken = null;
List<MetricAlarm> metricAlarms = new ArrayList<>();
for (int i = 0; i < 100; i++) {

    DescribeAlarmsRequest describeAlarmsRequest = new DescribeAlarmsRequest();
    describeAlarmsRequest.setNextToken(nextToken);
    describeAlarmsRequest.setMaxRecords(100);

    DescribeAlarmsResult describeAlarmsResult = getClient().describeAlarms(describeAlarmsRequest);
    List<MetricAlarm> metricAlarmsTmp = describeAlarmsResult.getMetricAlarms();
    metricAlarms.addAll(metricAlarmsTmp);
    nextToken = describeAlarmsResult.getNextToken();
    logger.info("nextToken: {}", nextToken);

    if (nextToken == null) {
        break;
    }
}
logger.info("metricAlarms size: {}", metricAlarms.size());

当然还有改进的余地，例如创建 while 循环而不是 for 循环。

更新:

这是我的精修版

String nextToken = null;
List<MetricAlarm> metricAlarms = new ArrayList<>();

while (nextToken != null || metricAlarms.size() == 0) {
    DescribeAlarmsRequest describeAlarmsRequest = new DescribeAlarmsRequest().withNextToken(nextToken).withMaxRecords(100); // create the request
    DescribeAlarmsResult describeAlarmsResult = getClient().describeAlarms(describeAlarmsRequest); // get the result
    metricAlarms.addAll(describeAlarmsResult.getMetricAlarms()); // add new alarms to our list
    nextToken = describeAlarmsResult.getNextToken(); // check if we have a nextToken
    if (nextToken == null && cachedMetricAlarms.size() == 0) { // if we have no alarm in AWS we get inside the loop but we would never exit -> intercept that
            break;
        }
}
logger.info("metricAlarms size: {}", metricAlarms.size());