Hi. I really doubt this is a drakma issue but Amazon has been of no help. I've written a Lisp interface to the EC2 Query API (CL-EC2); it uses Drakma has its http client. All of the implemented API calls work just fine with the exception of the Cloudwatch ListMetrics call, which for some reason began failing this week. Amazon's cloudwatch scratchpad tool fails now also with the same error, but I tried the python boto library and it works fine, as does the Amazon command-line tool mon-list-metrics.

Here's the header output:

SIERRA(29): (ec2:with-header-stream () (cw:list-metrics))
GET /?AWSAccessKeyId=<our access key>?Action=ListMetrics&SignatureMethod=HmacSHA256&SignatureVersion=2&Timestamp=2010-02-24T20%3A46%3A25Z&Version=2009-05-15&Signature=BHAB8OAeGU6IRp6Ki%2BDuEKM9%2FOiKKOSu%2FGntICOotqI%3D HTTP/1.1
Host: monitoring.amazonaws.com
User-Agent: Drakma/1.1.0 (SBCL 1.0.30; Linux; 2.6.30.10-105.2.16.fc11.x86_64; http://weitz.de/drakma/)
Accept: */*
Connection: close

HTTP/1.1 400 Bad Request
x-amzn-RequestId: ac7304ba-2185-11df-a0eb-cd40a3846a7b
Content-Type: text/xml
Content-Length: 270
Date: Wed, 24 Feb 2010 20:46:25 GMT

And here's the condition as reported by our library:

Amazon EC2 Error: Bad Request:
status: 400
uri: http://monitoring.amazonaws.com?AWSAccessKeyId=<our access key>&Action=ListMetrics&SignatureMethod=HmacSHA256&SignatureVersion=2&Timestamp=2010-02-24T20%3A46%3A25Z&Version=2009-05-15&Signature=BHAB8OAeGU6IRp6Ki%2BDuEKM9%2FOiKKOSu%2FGntICOotqI%3D
headers: ((X-AMZN-REQUESTID
. ac7304ba-2185-11df-a0eb-cd40a3846a7b)
(CONTENT-TYPE . text/xml) (CONTENT-LENGTH . 270)
(DATE . Wed, 24 Feb 2010 20:46:25 GMT))
body: ((ErrorResponse xmlns
http://monitoring.amazonaws.com/doc/2009-05-15/)
(Error (Type Sender) (Code DelegationFailure)
(Message Malformed token))
(RequestId ac7304ba-2185-11df-a0eb-cd40a3846a7b))

[Condition of type EC2:EC2-ERROR]

I'm just looking for some ideas, so forgive me if I've bothered anyone. What the hell is a DelegationFailure anyway? Sorry to trouble you folks. Thanks.

-- david

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