There are currently two entries for the city of Eindhoven in the
Nomanitim geoecoding database. Reduced acccuracy still is enough to
check that the API works properly.
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* Introduce the `VersionInfo` struct, build from the vergen environment
variables
* Add the `version` handler to construct and return the version info
* Update the README
* The map endpoints return an HTTP 404 error in case of unknown or
out-of-bound locations
* The forecast endpoint with an address returns an HTTP 404 with error
JSON in case geocoding fails
* The forecast endpoints return the errors per metric in the `errors`
field of the forecast
* Implement `Display` for `Metric`
* Use a `BTreeMap` to have an ordered `errors` field/object
* Also log the errors to the console
* Update the tests
* Document the errors that can occur
* Add dependency on the `thiserror` crate
* Add a global `Error` type, but also `maps::Error` and
`providers::combined::MergeError` for convenience
* Add matching `Result` types that default to the respective `Error`
type
* Refactor code to yield all kinds of error variants
* Add FIXMEs where library errors still need to be handled
* Remove documentation that explained why `None` was returned, this is
captured in the error now
The `RetrievedMaps` struct captures the image and its metadata:
the last modification time and the base timestamp for the maps.
* No longer store the last modification time, called "stamp" before,
separately in the `Maps` struct
* Update methods on `Maps` to use the `RetrievedMaps` structs and
the timestamp base in particular for sampling and map marking
* Update the `MapsRefresh` implemention to use the last modification
time
* Rename some variables from `map` to `image` in the helper functions
for consistency
* Update tests and documentation
* Make the combined provider keep track of the AQI and pollen maximum
value
* Extend the `Forecast` struct with the `aqi_max` and `pollen_max`
fields
* Fill the `aqi_max` and `pollen_max` fields when the PAQI metric is
selected
* Update the documentation
* Extend the tests
This way we can build Rockets from outside the crate and run benchmarks,
for example.
* Add top-level `setup()` function to create a Rocket and set up the
maps refresher task
* Change the type of `maps::run` since `!` is still an unstable type
* Fix HTTP code blocks in `README.md` so they don't appear as doctests
to rustdoc
Paul van Tilburg