[drakma-devel] DelegationFailure with Amazon CloudWatch

[David Young]

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<http://common-lisp.net/project/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

--
And now these three remain: faith, hope, and love.
But the greatest of these is love.
 -- 1 Corinthians 13:13

To truly engage with how the world is, our hearts
are going to be broken again and again.
 -- Rob Bell, "Velvet Elvis, Repainting the Christian Faith"

To produce without possessing, to work without expecting,
to enlarge without usurping. This is the supreme virtue.
-- Lao-Tzu
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