If the user has a wrong base64 padded secret key the googlemaps
python library is returning "TypeError: Incorrect padding" which
is very hard to understand. So now we check if the secret key is
a valid base64 string
The new module cartodb_services/config is intended for services configuration objects
Some legacy configuration objects remain under cartodb_services/metrics.
The refactored configuration backends are also not moved here
The (legacy) Config object rate limit-related modifications are reverted.
For the legacy case, configuration is handled in a specific RateLimits builder class.
ServiceManager class has been introduced to handle service configuration at
SQL level (with a LegacyServiceManager alternative for non-refactored services).
These new classes take the responsibility of rate limits and quota checking.
Tests have been added for ServiceManager and rate limits, but currently they
check only the limits configuration since Lua support would be needed
to use rratelimit with MockRedis.
Found via unit test:
```sh
$ nosetests -x test/
....................................................................................E
======================================================================
ERROR: test_geocode_address_with_valid_params (test.test_mapzengeocoder.MapzenGeocoderTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/requests_mock/mocker.py", line 177, in inner
return func(*args, **kwargs)
File "/home/ubuntu/src/dataservices-api/server/lib/python/cartodb_services/test/test_mapzengeocoder.py", line 100, in test_geocode_address_with_valid_params
country='ESP')
File "/home/ubuntu/src/dataservices-api/server/lib/python/cartodb_services/cartodb_services/mapzen/qps.py", line 28, in wrapped_function
return QPSService(retry_timeout=timeout, queries_per_second=qps).call(original_function, *args, **kwargs)
File "/home/ubuntu/src/dataservices-api/server/lib/python/cartodb_services/cartodb_services/mapzen/qps.py", line 53, in call
raise e
AttributeError: 'NoneType' object has no attribute 'lower'
----------------------------------------------------------------------
Ran 85 tests in 0.140s
FAILED (errors=1)
```
timedelta microseconds is just the microseconds part of the timedelta
object not the elapsed time in microseconds.
I've change to use the total_seconds method to get all the elapsed time
in seconds and transform to miliseconds.
