Re: EpicsQT and Archiver Appliance

[<rory.clarke@stfc.ac.uk>]

Hello Michael,

 

I have installed carchivetools and it looks like is will do exactly what I need but I think I am having a problem connecting it to AA. I am using twistd (the Twisted daemon) 13.2.0 and Python 2.7.6. I compiled and installed using setup.py and installed it under su. It all went smoothly and twistd –help now shows a2aproxy

 

The problem is when I query a2aproxy with archiver.names or values (anything that seems to connect to AA). a2aproxy will crashes with an exception 'dict' object has no attribute 'getint'. All the gory details follow...

 

I have an archiver appliance running on  localhost. The mgmt and retrieval  urls are running on different ports but I believe that is normal for the full setup of AA.  From a browser, http://localhost:17665/mgmt/bpl/getApplianceInfo,

 

AA will return:

 

{"engineURL":"http:\/\/localhost:17666\/engine\/bpl","identity":"appliance0","retrievalURL":"http:\/\/localhost:17668\/retrieval\/bpl","clusterInetPort":"localhost:16670","etlURL":"http:\/\/localhost:17667\/etl\/bpl","version":"Archiver Appliance Version 0.0.1_SNAPSHOT_13-May-2016T11-23-57","mgmtURL":"http:\/\/localhost:17665\/mgmt\/bpl","dataRetrievalURL":"http:\/\/localhost:17668\/retrieval"}

 

 

So, I start the a2aproxy via:

twistd  -n a2aproxy -P 8888 -A localhost:17665 (and several combinations of this with http:// etc during testing)

 

If I start from outside the twisted plugin directory it will crash, this was my first worry as I thought that it was installed:

ImportError: No module named EPICSEvent_pb2

 

However, if I go into the twisted directory it will start. Ok, so I moved on, everything looks good. I can send and return the archiver.info call and get the hardcoded response from the proxy.

However, if I  send:

archiver.names(1,"rga")

 

Instead of getting a list of matching PVs from the AA it crashed with:

 

2016-07-26 13:53:40+0100 [HTTPChannel,0,148.79.212.92] INFO:carchive.a2aproxy.resource Request: archiver.names(1, 'rga')     

2016-07-26 13:53:40+0100 [HTTPChannel,0,148.79.212.92] WARNING:carchive.a2aproxy.resource Cleanup of request with no reply              

2016-07-26 13:53:40+0100 [HTTPChannel,0,148.79.212.92] 148.79.212.92 - - [26/Jul/2016:12:53:39 +0000] "POST /cgi-bin/ArchiveDataServer.cgi HTTP/1.1" 500 - "-" "Python-xmlrpc/3.5"

2016-07-26 13:53:40+0100 [HTTPChannel,0,148.79.212.92] ERROR:carchive.a2aproxy.resource Unhandled execption during request: Traceback (most recent call last):

                  File "/usr/lib/python2.7/dist-packages/twisted/web/resource.py", line 250, in render

                    return m(request)

                  File "/usr/local/lib/python2.7/dist-packages/carchive/a2aproxy/resource.py", line 106, in render_POST

                    Dinfo = self.fetchInfo()

                  File "/usr/local/lib/python2.7/dist-packages/carchive/a2aproxy/resource.py", line 73, in fetchInfo

                    D = getArchive({'url':self.infourl})

                  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1237, in unwindGenerator

                    return _inlineCallbacks(None, gen, Deferred())

                --- <exception caught here> ---

                  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1099, in _inlineCallbacks

                    result = g.send(result)

                  File "/usr/local/lib/python2.7/dist-packages/carchive/backend/appl.py", line 208, in getArchive

                    maxRequests=conf.getint('maxrequests', 100))

                exceptions.AttributeError: 'dict' object has no attribute 'getint'

 

So, I thought that maybe the AA address was not getting set correctly in the proxy startup so I put a print statement into

./carchivetools-master/carchive/a2aproxy/resource.py:

def buildResource(infourl=None):

    if not infourl.startswith('http') and infourl.find('/')==-1:

        # only host:port is provided, use default URL

        infourl = "http://%s/mgmt/bpl/getApplianceInfo"%infourl

    C = DataServer()

    C.infourl = infourl

    print(infourl)

 

This printed out the correct url for AA: http://localhost:17665/mgmt/bpl/getApplianceInfo

 

Best regards,

 

Rory