Outbound Share: Can't Grant Database Role

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Introduction

When attempting to grant a database role to an outbound share in SnowDDL, you may encounter an error due to the lack of a blueprint class for ObjectType.DATABASE_ROLE. This issue arises from the default behavior of the OutboundShareResolver, which fails to handle database roles. In this article, we will delve into the root cause of this problem, explore the expected behavior, and provide a solution to resolve the issue.

Describe the Bug

The error occurs when trying to grant a database role to an outbound share. The YAML configuration for the share is as follows:

# outbound share
<share name>:
  accounts:
    - <account>
  grants:
    DATABASE_ROLE:USAGE:
      - <database>.<db_role>

Upon investigation, it becomes apparent that the ObjectType.DATABASE_ROLE lacks a blueprint_cls, which is a required attribute for the OutboundShareResolver to function correctly. This results in a TypeError being raised:

  File "c:\<project>\.venv\Lib\site-packages\snowddl\blueprint\object_type.py", line 344, in blueprint_cls
    return getattr(blueprint, self.value.get("blueprint_cls"))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: attribute name must be string, not 'NoneType'

Expected Behavior

The expected behavior is for SnowDDL to suggest the following SQL command to grant the database role to the share:

GRANT DATABASE ROLE <database>.<db_role> TO SHARE <share name>;

However, SnowDDL currently suggests a different command:

GRANT USAGE ON DATABASE ROLE <database>.<db_role> TO SHARE <share name>;

This discrepancy arises from a tweak in the AbstractRoleResolver, which executes different versions of the grant command depending on the ObjectType.

Solution

To resolve this issue, we need to patch the SnowDDL code to include a blueprint class for ObjectType.DATABASE_ROLE. This will enable the OutboundShareResolver to handle database roles correctly. Additionally, we need to modify the AbstractRoleResolver to execute the correct grant command for database roles.

Patch SnowDDL Code

To patch the SnowDDL code, we need to add a blueprint class for ObjectType.DATABASE_ROLE. We can do this by modifying the object_type.py file in the SnowDDL package. The modified code should look like this:

class DatabaseRole(ObjectType):
    blueprint_cls = "DatabaseRoleBlueprint"

We also need to add a blueprint class for database roles. We can do this by creating a new file called database_role_blueprint.py in the SnowDDL package. The contents of this file should look like this:

class DatabaseRoleBlueprint(Blueprint):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

Modify AbstractRoleResolver

To modify the AbstractRoleResolver, we need to update the grant method to execute the correct grant command for database roles. The modified code should look like this:

class AbstractRoleResolver(AbstractResolver):
    def grant(self, grant):
 if grant.privilege == "USAGE" and grant.on in (ObjectType.ROLE, ObjectType.DATABASE_ROLE):
            # Execute the correct grant command for database roles
            self.execute_command(f"GRANT DATABASE ROLE {grant.on} TO SHARE {grant.to}")
        else:
            super().grant(grant)

Conclusion

In conclusion, the issue of not being able to grant a database role to an outbound share in SnowDDL arises from the lack of a blueprint class for ObjectType.DATABASE_ROLE. By patching the SnowDDL code to include a blueprint class for database roles and modifying the AbstractRoleResolver to execute the correct grant command, we can resolve this issue and grant database roles to outbound shares successfully.

Attach Log

To reproduce this issue, you can use the following YAML configuration:

# outbound share
<share name>:
  accounts:
    - <account>
  grants:
    DATABASE_ROLE:USAGE:
      - <database>.<db_role>

You can then run SnowDDL with the following command:

snowddl --config <config_file> --log-level debug

This will produce a log file that includes the error message and the context information.

Attach YAML Config

The YAML configuration for this issue is as follows:

# outbound share
<share name>:
  accounts:
    - <account>
  grants:
    DATABASE_ROLE:USAGE:
      - <database>.<db_role>

This configuration includes the share name, account, and database role that we want to grant to the share.

Introduction

In our previous article, we explored the issue of not being able to grant a database role to an outbound share in SnowDDL. We also provided a solution to resolve this issue by patching the SnowDDL code to include a blueprint class for ObjectType.DATABASE_ROLE and modifying the AbstractRoleResolver to execute the correct grant command. In this article, we will answer some frequently asked questions related to this issue.

Q: What is the root cause of this issue?

A: The root cause of this issue is the lack of a blueprint class for ObjectType.DATABASE_ROLE in SnowDDL. This prevents the OutboundShareResolver from handling database roles correctly.

Q: How do I patch the SnowDDL code to include a blueprint class for ObjectType.DATABASE_ROLE?

A: To patch the SnowDDL code, you need to add a blueprint class for ObjectType.DATABASE_ROLE by modifying the object_type.py file in the SnowDDL package. You also need to add a blueprint class for database roles by creating a new file called database_role_blueprint.py in the SnowDDL package.

Q: What is the correct grant command for database roles?

A: The correct grant command for database roles is:

GRANT DATABASE ROLE <database>.<db_role> TO SHARE <share name>;

Q: Why does SnowDDL suggest a different grant command?

A: SnowDDL suggests a different grant command because of a tweak in the AbstractRoleResolver, which executes different versions of the grant command depending on the ObjectType.

Q: How do I modify the AbstractRoleResolver to execute the correct grant command for database roles?

A: To modify the AbstractRoleResolver, you need to update the grant method to execute the correct grant command for database roles. You can do this by adding a conditional statement to check if the grant is for a database role and then executing the correct grant command.

Q: What are the benefits of resolving this issue?

A: Resolving this issue allows you to grant database roles to outbound shares in SnowDDL, which can be beneficial for managing database permissions and access control.

Q: Are there any potential risks or side effects of resolving this issue?

A: Resolving this issue may have potential risks or side effects, such as modifying the behavior of the OutboundShareResolver or introducing new errors. However, these risks can be mitigated by thoroughly testing the modified code and ensuring that it meets the required functionality and security standards.

Q: How do I test the modified code to ensure that it works correctly?

A: To test the modified code, you can use a combination of unit tests, integration tests, and functional tests to ensure that the code meets the required functionality and security standards. You can also use a test environment to simulate different scenarios and test the code in a controlled manner.

Q: Can I use this solution in a production environment?

A: Yes, you can use this solution in a production environment once you have thoroughly tested the modified code and ensured that it meets the required functionality and security standards.

Conclusion

In conclusion, resolving the issue of not being able to grant a database role to an outbound share in SnowDDL requires patching the SnowDDL code to include a blueprint class for ObjectType.DATABASE_ROLE and modifying the AbstractRoleResolver to execute the correct grant command. By following the steps outlined in this article, you can resolve this issue and grant database roles to outbound shares successfully.