Switch to new backend interface

[frankenjoe]

Apply necessary changes to audb in order to use the new backend interface that will be introduced with audackend>=1.0.0, see audeering/audbackend#76.
This does not change how files are stored on Artifatory hosts as we use the legacy backend option there.

Building the docs and running the docstring examples are temporary disabled until we have a published version of emodb with the new structure

In the Authentication section we now link to audbackend.Artifactory:

[frankenjoe]

In audeering/audbackend#76 (comment) a migration plan is proposed that would allow us to also re-enable the emodb related tests here without affecting the tests of the main branch.

[frankenjoe]

Locally all tests are passing again, but it seems that in the CI job it cannot read the credentials.

[frankenjoe]

@hagenw any idea why? ARTIFACTORY_USERNAME and ARTIFACTORY_API_KEY should be set, right?

[frankenjoe]

@hagenw any idea why? ARTIFACTORY_USERNAME and ARTIFACTORY_API_KEY should be set, right?

Of course not, because anonymous access should. Works after applying another fix in audeering/audbackend#130.

[frankenjoe]

All tests are passing again, so it seems with audeering/audbackend#130 we finally found a solution that does not require any change to our existing repositories and still allows us to switch to the new backend interface :)

[hagenw]

audeering/audbackend#132 seems to me also a remaining blocker.

With audbackend 0.3.17 and the current main branch of audb, audb.available() takes 36 s for me over VPN, using the dev branch of audbackend and this branch of audb it takes 151 s.

[frankenjoe]

audeering/audbackend#132 seems to me also a remaining blocker.

With audbackend 0.3.17 and the current main branch of audb, audb.available() takes 36 s for me over VPN, using the dev branch of audbackend and this branch of audb it takes 151 s.

I tweaked it a bit and now it takes 11s on my machine through VPN.

[hagenw]

Very nice, for me it now took 8 s, so now you even improved on the solution in main.

[codecov]

Codecov Report

Merging #306 (ddec948) into main (ca1a21c) will not change coverage.
The diff coverage is 100.0%.

Files	Coverage Δ
audb/core/api.py	100.0% <100.0%> (ø)
audb/core/load.py	100.0% <100.0%> (ø)
audb/core/load_to.py	100.0% <ø> (ø)
audb/core/publish.py	100.0% <100.0%> (ø)
audb/core/utils.py	100.0% <100.0%> (ø)

[hagenw]

Everything is still working, so I will merge this.