CRDS Database Access

JSON RPC Access

CRDS supports JSON RPC access to the CRDS catalog via the crds.client API.

Metadata for a single file

The JSON RPC call get_file_info() will return the available info for a single reference or mapping file from the specified observatory:

def get_file_info(observatory, filename):
    """Return a dictionary of CRDS information about `filename`."""

HSTJWSTROMAN

Single reference file:

>>> from crds.client import api
>>> api.get_file_info("hst", "lcb12060j_drk.fits")
{'activation_date': '2021-08-06 10:26:52',
 'aperture': 'wfc2-orampq',
 'blacklisted': 'false',
 'change_level': 'severe',
 'delivery_date': '2021-08-05 14:40:44',
 'derived_from': 'none',
 'description': 'updates to the variance and read noise calculations for subarrays ...',
 'filekind': 'biasfile',
 'instrument': 'acs',
 'name': '5851840kj_bia.fits',
 'observatory': 'hst',
 'pedigree': 'inflight 14/11/2015 14/11/2015',
 'reference_file_type': 'none',
 'rejected': 'false',
 'sha1sum': 'b684c9123da94ff5b9efb72c15316af050ecca62',
 'size': '42390720',
 'state': 'latest',
 'type': 'reference',
 'uploaded_as': '20151022_g2.0_wfc2-orampq_d_bia.fits',
 'useafter_date': '2015-10-22 23:30:54'}

Metadata for several / all files

The JSON RPC call get_file_info_map() will return the info for multiple (or all) files and the specified (or all) fields as a dictionary of dictionaries mapping filename onto info:

def get_file_info_map(observatory, files=None, fields=None):
  """Return the info { filename : { info } } on `files` of `observatory`.
  `fields` can be used to limit info returned to specified keys.
  """

If files is specified as None, info on all files is returned.

If fields are specified as None, info on all available fields is returned.

HSTJWSTROMAN

$ export CRDS_SERVER_URL=https://hst-crds.stsci.edu

>>> from crds.client import api
>>> api.get_file_info_map("hst", files=["lcb12060j_drk.fits", "n3o1022fj_drk.fits"], fields=["state","size","sha1sum"])
{'lcb12060j_drk.fits': {
    'sha1sum': '56cfd1107bda5d82cb49a301a50edb45cb64ded6',
    'size': '10549440',
    'state': 'latest'
    },
 'n3o1022fj_drk.fits': {
     'sha1sum': 'cecf11300015df8f39913b638138d8c67de77a02',
     'size': '10526400',
     'state': 'latest'
     }
}

Download CRDS catalog for SQLite queries

The CRDS catalog stores metadata about references not captured in the .rmap files. It also contains the history of CRDS context use, the effective dates at which particular contexts where the latest in the pipeline.

You can download a SQLite-3 snapshot of the CRDS catalog like this:

bashcsh

$ export CRDS_SERVER_URL=https://hst-crds.stsci.edu
$ export CRDS_PATH=/home/homer/crds_cache
$ export crds sync --fetch-sqlite-db
CRDS - INFO - SQLite database file downloaded to: /home/homer/crds_cache/config/hst/crds_db.sqlite3

will snapshot the current CRDS catalog on the CRDS server and download it to your local CRDS cache as a SQLite3 database file. The SQLite database can typically be accessed like this:

$ sqlite3 /home/homer/crds_cache_dev/config/hst/crds_db.sqlite3

sqlite> .tables
crds_hst_catalog       crds_hst_context_history

sqlite> .mode tabs
sqlite> .headers on
sqlite> select * from crds_hst_context_history where state="latest" limit 1;
id    name    start_date        context     state          description
2        2013-07-02 15:44:53    hst.pmap    latest    set by system
\.\.\.

The CRDS catalog contains the following meta-data:

Catalog Fields	type	description
name	str	CRDS filename
uploaded_as	str	Name of file at time of upload / generation
state	str	uploaded, delivered, submitted, archiving, archived, archiving-failed, bad
blacklisted	bool/int	True/1 == this mapping, and all mappings referring to it, are invalid.
rejected	bool/int	True/1 == this file is considered scientifically invalid
replaced_by_filename	str	Succeeding reference file in chain of contexts. Weakly defined.
instrument	str	instrument name file applies to
filekind	str	reference type. For HST, also keyword name for dataset headers
type	str	reference or mapping
description	str	description given at time of delivery
comment	str	COMMENT from reference file
aperture	str	APERTURE from reference file
derived_from	str	Name of mapping this one was derived from
sha1sum	str	sha1sum of file to verify file integrity
size	int	length of file in bytes
creator_name	str	author of reference or mapping file
deliverer_user	str	person who submitted the reference or mapping to CRDS
deliverer_email	str	e-mail of person who submitted reference

NOTE: Reference file assignment criteria are encoded in the CRDS rules / mappings and displayed as tables on the web site context display. See also crds.matches for information on displaying matching criteria based on rmaps at the command line.