csppfetch

csppfetch is a Python 3 module for downloading dynamic ancillary data. It can:

• Maintain a local cache of ancillary data
• Download the specific ancillary data files needed to process a given time step
  • Using the local cache if available
  • Optionally updating the local cache

Final files in the cache are atomically created; from the perspective of other programs a given ancillary data file either completely exists or doesn't exist at all.

Multiple copies of this module can safely run at the same time; locks are used to ensure they don't interfere with each other. (Your operating system and filesystem will need to correctly implement lockf.)

If a file is already present in the local cache, this module will NOT replace them; their existence is assumed to mean they are correct. To force a re-download, delete the existing file.

csppfetch implements the CSPP Geo ancillary download behavior guidelines.

Requires Python 3.6 or later.