dev: StaticCredentials and DriverConfig circular dependency

[Arhimisha]

Reproducible example

first_driver_config = ydb.DriverConfig(
    endpoint=endpoint,
    database=database,
    root_certificates=ydb.load_ydb_root_certificate()
)
credentials = ydb.StaticCredentials(
    driver_config=first_driver_config,
    user=ydb_user,
    password=ydb_password
)

# Second driver config with credentials
second_driver_config = ydb.DriverConfig(
    endpoint=endpoint,
    database=database,
    root_certificates=ydb.load_ydb_root_certificate(),
    credentials=credentials
)
# This Driver is work
good_driver = ydb.Driver(driver_config=second_driver_config)
try:
    good_driver.wait(timeout=5)
except Exception:
    print(good_driver.discovery_debug_details())

# This driver don't work 
broken_driver = ydb.Driver(driver_config=first_driver_config, credentials=credentials)
try:
    broken_driver.wait(timeout=5)
except Exception:
    print(broken_driver.discovery_debug_details())

OUT:

Failed to resolve endpoints for database <database>. Endpoint: "<endpoint>". Error details:
 unauthenticated, unauthenticated: { <main>: Error: Access denied without user token }

Installed versions

ydb==3.17.2

[vgvoleg]

Reproducible example

first_driver_config = ydb.DriverConfig(
    endpoint=endpoint,
    database=database,
    root_certificates=ydb.load_ydb_root_certificate()
)
credentials = ydb.StaticCredentials(
    driver_config=first_driver_config,
    user=ydb_user,
    password=ydb_password
)

# Second driver config with credentials
second_driver_config = ydb.DriverConfig(
    endpoint=endpoint,
    database=database,
    root_certificates=ydb.load_ydb_root_certificate(),
    credentials=credentials
)
# This Driver is work
good_driver = ydb.Driver(driver_config=second_driver_config)
try:
    good_driver.wait(timeout=5)
except Exception:
    print(good_driver.discovery_debug_details())

# This driver don't work 
broken_driver = ydb.Driver(driver_config=first_driver_config, credentials=credentials)
try:
    broken_driver.wait(timeout=5)
except Exception:
    print(broken_driver.discovery_debug_details())

OUT:

Failed to resolve endpoints for database <database>. Endpoint: "<endpoint>". Error details:
 unauthenticated, unauthenticated: { <main>: Error: Access denied without user token }

Installed versions

ydb==3.17.2

Hi! As I see in source code we have this behavior: if we pass driver_config to ydb.Driver, Driver will use this driver_config as the only source of truth - that's why credentials from your broken_driver do not work. It is not very obvious, we will think how to make things more straightforward for users. Thanks for feedback, updates will be posted in this issue.

[vgvoleg]

Fixed in https://github.com/ydb-platform/ydb-python-sdk/releases/tag/3.18.1

Now, it is not an issue to create your "broken" driver - arguments from both DriverConfig and Driver will work. Also, there is a new way to create StaticCredentials that looks more straightforward and has no dependency on DriverConfig: ydb.StaticCredentials.from_user_password(user, password) Full example could be found here: https://ydb-platform.github.io/ydb-python-sdk/examples/authentication.html#static-credentials