fetchTimestampMethods: Functions to use as custom fetchTimestamp methods.
In USGS-VIZLAB/vizlab: Utilities for building online data visualizations

Description Usage Arguments Details Examples

These functions serve common use cases for timestamp fetching. See also fetchTimestampHelpers, which allows you to write still more customized methods, and pre-defined fetchTimestamp() methods for several fetchers supported by vizlab.

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alwaysCurrent(viz)

neverCurrent(viz)

viz

the identifier for a fetch item in viz.yaml

alwaysCurrent - writes a timestamp file just once, the first time the data file is present when fetchTimestamp is called. Edits the modified time, mtime, of the timestamp file to equal the modified time of the data file, so that on subsequent builds the data file is always up to date relative to the timestamp file. REFETCHES MAY STILL OCCUR if there are changes to the fetch item's viz.yaml chunk, scripts, or other dependencies.