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PyDMR

PyDMR is a set of utilities that implement a regression testing framework for OPeNDAP data held in the NASA Earthdata Cloud system. It also can be used to test the idea of a DMR++ invariant and ways that might be used in a DMR++ caching scheme.

What's here

This repository holds code for a testing framework for Hyrax in NGAP and for a simple prototype system to determine if the DMR++ documents held in a cache are stale. The code is mixed together since some parts are shared by both systems.

The testing framework

WIP

Using the commands

./regression_tests.py -p POCLOUD -t -v

Run tests on all the collections from POCLOUD that have OPeNDAP URLs. Show verbose output and basic timing stats. The results are written to an XML file. See --help for more info.

./opendap_providers.py

Query CMR to find all the providers that have collections with the has_opendap_url property

Building DMR++ Documents

The command line utility build_dmrpp can be used to build DMR++ documents for a whole collection or a range of granules in a collection selected using ISO8601 dates. The DMR++ documents are either saved to local files in a directory named using collection concept ID or to an S3 bucket using the CCID as an object name prefix.

The command has help.

Here is an example for one collection:

./build_dmrpp.py -v -t -T prod-token.txt \
    -D "2018-08-01T00:00:00Z,2018-08-02T23:59:59Z" C2036877806-POCLOUD

DMR++ Caching

This repository holds a set of functions that ask CMR various questions that enable reading DMR++ documents for granules using either the 'resty' OPeNDAP URL or a collection concept id (CCID) and granule title.

Also contained here are some commands that use that library. Those commands are:

  • ask_cmr.py Ask the CMR for all the collections a provider has, all the granules in a collection, collection info, all the related URLs for a granule that are 'GET DATA' or 'USE SERVICE API' URLs.
  • get_dmrpp.py Will read the DMR++ given the URL to a data file that has a paired DMR++. The presumption is that the file is in EDC S3, but there's no requirement that's true, only that something will be returned when .dmrpp is appended to the URL.
  • mk_invariant_dmrpp.py Build the invariant form of a DMR++ document. This command can also extract the version information from a DMR++, so it can be used to test the idea of cache invalidation based on version numbers.

Testing out the commands

It can be tedious to figure out all the various providers IDs, Collection IDs, so here are some to start with.

Providers: PODAAC, GES_DISC, POCLOUD

Using ask_cmr:

  • ./ask_cmr.py -p POCLOUD: Get all the collections
  • ./ask_cmr.py -p POCLOUD -o: Get all the collections with OPeNDAP enabled
  • ./ask_cmr.py -c C2036882064-POCLOUD -g -t: All the granules in the collection, with timing info (-t)
  • ./ask_cmr.py -t -r https://opendap.earthdata.nasa.gov/collections/C2205105895-POCLOUD/granules/19980101120000-REMSS-L4_GHRSST-SSTfnd-MW_OI-GLOB-v02.0-fv05.1 Get the Related URLs for this pseudo 'resty URL'
  • ./ask_cmr.py -t -R C2205105895-POCLOUD:19980101120000-REMSS-L4_GHRSST-SSTfnd-MW_OI-GLOB-v02.0-fv05.1: Get the Related URLs for the resty URL that would have the CCID and title that are listed here separated by a colon (:)

Getting the paired DMR++:

  • ./get_dmrpp.py -t https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-protected/MW_OI-REMSS-L4-GLOB-v5.1/20220902120000-REMSS-L4_GHRSST-SSTfnd-MW_OI-GLOB-v02.0-fv05.1.nc: Get the DMR++ paired with this granule

Building the invariant:

  • mk_invariant_dmrpp 19980101120000-REMSS-L4_GHRSST-SSTfnd-MW_OI-GLOB-v02.0-fv05.1.nc.dmrpp: Print the DMR++ invariant
  • mk_invariant_dmrpp -v 19980101120000-REMSS-L4_GHRSST-SSTfnd-MW_OI-GLOB-v02.0-fv05.1.nc.dmrpp: Print the builder version
  • mk_invariant_dmrpp -l 19980101120000-REMSS-L4_GHRSST-SSTfnd-MW_OI-GLOB-v02.0-fv05.1.nc.dmrpp: Print the builder version, but in a form that is easier to parse

NB: This: ./ask_cmr.py -t -R "G2100400959-POCLOUD:cyg.ddmi.s20210228-003000-e20210228-233000.l3.grid-wind-cdr.a10.d10" should return a URL to data but does not.