Forman 272 computed vars

[forman]

What's in here

The configuration of xcube serve has been enhanced to support augmentation of data cubes by new variables computed on-the-fly (#272). You can now add a section Augmentation into a dataset descriptor, e.g.:

Datasets:
  - Identifier: abc
    ...
    Augmentation:
        Path: compute_new_vars.py
        Function: compute_variables
        InputParameters:
            ...
  - ...

where compute_variables is a function that receives the parent xcube dataset and is expected to return a new dataset with new variables.

Note

I've enhanced the demo service configuration in examples/serve/demo/config.yml which now computes a new variable (a silly sum of CHL and TSM).

[codecov-io]

Codecov Report

Merging #273 into master will decrease coverage by 0.25%.
The diff coverage is 75.38%.

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
- Coverage   84.44%   84.19%   -0.26%     
==========================================
  Files          84       85       +1     
  Lines        8765     8979     +214     
==========================================
+ Hits         7402     7560     +158     
- Misses       1363     1419      +56

Impacted Files	Coverage Δ
xcube/webapi/app.py	100% <100%> (ø)	⬆️
xcube/webapi/errors.py	100% <100%> (ø)	⬆️
xcube/core/mldataset.py	63.46% <100%> (+0.14%)	⬆️
xcube/webapi/controllers/places.py	95.45% <100%> (ø)	⬆️
xcube/cli/serve.py	77.19% <50%> (+0.4%)	⬆️
xcube/webapi/context.py	77.31% <55.55%> (-5.28%)	⬇️
xcube/webapi/auth.py	86.48% <86.48%> (ø)
xcube/webapi/controllers/catalogue.py	84.86% <88.88%> (+0.42%)	⬆️
xcube/webapi/handlers.py	91.71% <90.9%> (+0.1%)	⬆️
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 79ddca1...1740e5a. Read the comment docs.