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[IDD #OWZ-603499]: Error downloading radar data


> I recently configured my LDM to start receiving a small set of radar
> products from Unidata for ingest into AWIPS, however I'm getting errors in
> my "ldmd.log". I was hoping you could help me interpret those errors?

We will certainly try :-)

> This is one of my entries in "ldmd.conf" for a specific NEXRAD Level III
> product and a specific station:
> REQUEST NEXRAD "SDUS[23578]. ....
> ([0-3][0-9])([0-2][0-9])([0-6][0-9]).*/p(DAA)(AIH)" idd.unidata.ucar.edu

Quick comment:

The extended regular expression (ERE) you are using seems overly complicated
for what you seem to want.  A much simpler REQUEST could look like:

REQUEST NEXRAD3 "/pDAAAIH" idd.unidata.ucar.edu

The LDM utility 'notifyme' is very handy since it can be used to test
EREs to see if they specify what is, in fact, wanted.  For instance:

<as 'ldm'>
notifyme -vl- -f NEXRAD3 -p "/pDAAAIH" -o 3600 -h idd.unidata.ucar.edu

The output from this 'notifyme' invocation on your system should
look like:

~: notifyme -vl- -f NEXRAD3 -p "/pDAAAIH" -o 3600 -h idd.unidata.ucar.edu
20200904T145843.294018Z notifyme[402111]            notifyme.c:main:363         
        NOTE  Starting Up: idd.unidata.ucar.edu: 20200904135843.293800 TS_ENDT 
20200904T145843.294070Z notifyme[402111]            ldm5_clnt.c:forn5:460       
        NOTE  LDM-5 desired product-class: 20200904135843.293800 TS_ENDT 
20200904T145843.294534Z notifyme[402111]            error.c:err_log:236         
        INFO  Resolving idd.unidata.ucar.edu to took 0.000395 
20200904T145843.305285Z notifyme[402111]            ldm5_clnt.c:forn_signon:294 
        NOTE  NOTIFYME(idd.unidata.ucar.edu): OK
20200904T145845.269047Z notifyme[402111]            
notifyme.c:notifymeprog_5:212       INFO       16300 20200904140239.462724 
NEXRAD3 168654802  SDUS88 PAFC 041357 /pDAAAIH !nids/
20200904T145845.945111Z notifyme[402111]            
notifyme.c:notifymeprog_5:212       INFO       16238 20200904140822.219223 
NEXRAD3 168668542  SDUS88 PAFC 041402 /pDAAAIH !nids/

Aside: I use the canonical name for the NEXRAD Level 3 LDM/IDD feed, NEXRAD3
instead of the other names by which it is known, NEXRAD, NNEXRAD.

> and this is my entry in "pqact.conf"
> NEXRAD  ^SDUS[23578].*
> FILE    -close  /awips2/edex/data/manual/\1

First, the '\1' notation in the FILE action file name will be
replaced with the Product ID clause that is contained in the first
set of parentheses in your ERE.  Your action contains no clauses
surrounded by parentheses, so nothing will be matched, and '\1'
will be blank.

> The intent was that files received would be copied directly into the AWIPS
> manual ingest directory "/awips2/edex/data/manual" but it's not working.

It is not working because your ERE in your pattern-action file action
does not indicate which portion of the Product IDs should be identified
by the '\1' notation.

> Here are some of the errors I'm getting.
> 0200904T013338.393990Z pqact[8298]
> filel.c:unio_prodput:1285           ERROR Couldn't get entry for product
> "SDUS88 PAFC 040128 /pDAAAIH !nids/"
> 20200904T013338.394011Z pqact[8298]                 palt.c:prodAction:1237
> ERROR Couldn't process product: feedtype=NEXRAD3,
> pattern="^SDUS[23578].*", action=file, args="-close
> /awips2/edex/data/manual/\1"
> 20200904T013356.548835Z pqact[8298]                 filel.c:unio_open:1001
> ERROR Is a directory
> 20200904T013356.548887Z pqact[8298]                 filel.c:unio_open:1001
> ERROR Couldn't open file "/awips2/edex/data/manual/"
> It seems like LDM doesn't have permission to write to that directory

Your action is trying to write the product into a file name that 
matches the directory name, and, presumably, that directory already
exists, so it will fail.

> however there are several other products we receive via LDM that do the
> same thing successfully. 

I would guess that the EREs for those products do contain clauses within
parentheses that will match part of the Product IDs that are being

> Thanks for any suggestions about what might be going wrong?

I suspect that the action you want to use would look something

NEXRAD3<tab>^SDUS[23578]. .... 
<tab>FILE<tab>-close /awips2/edex/data/manual/\5_\4_\1\2\3

For the first match from the 'notifyme' listing above, this would have
created the file:


This assumes, of course, that the directory '/awips2/edex/data/manual' is
writable by the user running your LDM.


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Ticket Details
Ticket ID: OWZ-603499
Department: Support IDD
Priority: Normal
Status: Closed
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