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Description:

azureschemaregistry 1.2.0

Azure Schema Registry client library for Python
Azure Schema Registry is a schema repository service hosted by Azure Event Hubs, providing schema storage, versioning,
and management. The registry is leveraged by serializers to reduce payload size while describing payload structure with
schema identifiers rather than full schemas.
Source code | Package (PyPi) | API reference documentation | Samples | Changelog
Disclaimer
Azure SDK Python packages support for Python 2.7 has ended on 01 January 2022. For more information and questions, please refer to https://github.com/Azure/azure-sdk-for-python/issues/20691
Getting started
Install the package
Install the Azure Schema Registry client library for Python with pip:
pip install azure-schemaregistry

Prerequisites:
To use this package, you must have:

Azure subscription - Create a free account
Azure Schema Registry - Here is the quickstart guide to create a Schema Registry group using the Azure portal.
Python 3.7 or later - Install Python

Authenticate the client
Interaction with Schema Registry starts with an instance of SchemaRegistryClient class. The client constructor takes the fully qualified namespace and an Azure Active Directory credential:

The fully qualified namespace of the Schema Registry instance should follow the format: <yournamespace>.servicebus.windows.net.

An AAD credential that implements the TokenCredential protocol should be passed to the constructor. There are implementations of the TokenCredential protocol available in the
azure-identity package. To use the credential types provided by azure-identity, please install the Azure Identity client library for Python with pip:

pip install azure-identity

Additionally, to use the async API, you must first install an async transport, such as aiohttp:

pip install aiohttp

Create client using the azure-identity library:
from azure.schemaregistry import SchemaRegistryClient
from azure.identity import DefaultAzureCredential

credential = DefaultAzureCredential()
# Namespace should be similar to: '<your-eventhub-namespace>.servicebus.windows.net/'
fully_qualified_namespace = '<< FULLY QUALIFIED NAMESPACE OF THE SCHEMA REGISTRY >>'
schema_registry_client = SchemaRegistryClient(fully_qualified_namespace, credential)

Key concepts

Schema: Schema is the organization or structure for data. More detailed information can be found here.

Schema Group: A logical group of similar schemas based on business criteria, which can hold multiple versions of a schema. More detailed information can be found here.

SchemaRegistryClient: SchemaRegistryClient provides the API for storing and retrieving schemas in schema registry.

Examples
The following sections provide several code snippets covering some of the most common Schema Registry tasks, including:

Register a schema
Get the schema by id
Get the schema by version
Get the id of a schema

Register a schema
Use SchemaRegistryClient.register_schema method to register a schema.
import os

from azure.identity import DefaultAzureCredential
from azure.schemaregistry import SchemaRegistryClient

token_credential = DefaultAzureCredential()
fully_qualified_namespace = os.environ['SCHEMA_REGISTRY_FULLY_QUALIFIED_NAMESPACE']
group_name = os.environ['SCHEMA_REGISTRY_GROUP']
name = "your-schema-name"
format = "Avro"
definition = """
{"namespace": "example.avro",
"type": "record",
"name": "User",
"fields": [
{"name": "name", "type": "string"},
{"name": "favorite_number", "type": ["int", "null"]},
{"name": "favorite_color", "type": ["string", "null"]}
]
}
"""

schema_registry_client = SchemaRegistryClient(fully_qualified_namespace=fully_qualified_namespace, credential=token_credential)
with schema_registry_client:
schema_properties = schema_registry_client.register_schema(group_name, name, definition, format)
id = schema_properties.id

Get the schema by id
Get the schema definition and its properties by schema id.
import os

from azure.identity import DefaultAzureCredential
from azure.schemaregistry import SchemaRegistryClient

token_credential = DefaultAzureCredential()
fully_qualified_namespace = os.environ['SCHEMA_REGISTRY_FULLY_QUALIFIED_NAMESPACE']
schema_id = 'your-schema-id'

schema_registry_client = SchemaRegistryClient(fully_qualified_namespace=fully_qualified_namespace, credential=token_credential)
with schema_registry_client:
schema = schema_registry_client.get_schema(schema_id)
definition = schema.definition
properties = schema.properties

Get the schema by version
Get the schema definition and its properties by schema version.
import os

from azure.identity import DefaultAzureCredential
from azure.schemaregistry import SchemaRegistryClient

token_credential = DefaultAzureCredential()
fully_qualified_namespace = os.environ['SCHEMA_REGISTRY_FULLY_QUALIFIED_NAMESPACE']
group_name = os.environ["SCHEMAREGISTRY_GROUP"]
name = "your-schema-name"
version = int("<your schema version>")

schema_registry_client = SchemaRegistryClient(fully_qualified_namespace=fully_qualified_namespace, credential=token_credential)
with schema_registry_client:
schema = schema_registry_client.get_schema(group_name=group_name, name=name, version=version)
definition = schema.definition
properties = schema.properties

Get the id of a schema
Get the schema id of a schema by schema definition and its properties.
import os

from azure.identity import DefaultAzureCredential
from azure.schemaregistry import SchemaRegistryClient

token_credential = DefaultAzureCredential()
fully_qualified_namespace = os.environ['SCHEMA_REGISTRY_FULLY_QUALIFIED_NAMESPACE']
group_name = os.environ['SCHEMA_REGISTRY_GROUP']
name = "your-schema-name"
format = "Avro"
definition = """
{"namespace": "example.avro",
"type": "record",
"name": "User",
"fields": [
{"name": "name", "type": "string"},
{"name": "favorite_number", "type": ["int", "null"]},
{"name": "favorite_color", "type": ["string", "null"]}
]
}
"""

schema_registry_client = SchemaRegistryClient(fully_qualified_namespace=fully_qualified_namespace, credential=token_credential)
with schema_registry_client:
schema_properties = schema_registry_client.register_schema(group_name, name, definition, format)
id = schema_properties.id

Troubleshooting
General
Schema Registry clients raise exceptions defined in Azure Core.
Logging
This library uses the standard
logging library for logging.
Basic information about HTTP sessions (URLs, headers, etc.) is logged at INFO
level.
Detailed DEBUG level logging, including request/response bodies and unredacted
headers, can be enabled on a client with the logging_enable argument:
import sys
import logging
from azure.schemaregistry import SchemaRegistryClient
from azure.identity import DefaultAzureCredential

# Create a logger for the SDK
logger = logging.getLogger('azure.schemaregistry')
logger.setLevel(logging.DEBUG)

# Configure a console output
handler = logging.StreamHandler(stream=sys.stdout)
logger.addHandler(handler)

credential = DefaultAzureCredential()
# This client will log detailed information about its HTTP sessions, at DEBUG level
schema_registry_client = SchemaRegistryClient("your_fully_qualified_namespace", credential, logging_enable=True)

Similarly, logging_enable can enable detailed logging for a single operation,
even when it isn't enabled for the client:
schema_registry_client.get_schema(schema_id, logging_enable=True)

Next steps
More sample code
Please take a look at the samples directory for detailed examples of how to use this library to register and retrieve schema to/from Schema Registry.
Contributing
This project welcomes contributions and suggestions. Most contributions require you to agree to a
Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
the rights to use your contribution. For details, visit https://cla.microsoft.com.
When you submit a pull request, a CLA-bot will automatically determine whether you need to provide
a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions
provided by the bot. You will only need to do this once across all repos using our CLA.
This project has adopted the Microsoft Open Source Code of Conduct.
For more information see the Code of Conduct FAQ or
contact opencode@microsoft.com with any additional questions or comments.

Release History
1.2.0 (2022-10-10)
This version and all future versions will require Python 3.7+, Python 3.6 is no longer supported.
Features Added

group_name, name, and version have been added as optional parameters to the get_schema method on the sync and async SchemaRegistryClient.
version has been added to SchemaProperties.

Other Changes

Updated azure-core minimum dependency to 1.24.0.
Added distributed tracing support for sync and async SchemaRegistryClient.

1.1.0 (2022-05-10)
This version and all future versions will require Python 3.6+. Python 2.7 is no longer supported.
Features Added

group_name and name have been added as instance variables to SchemaProperties.

Other Changes

Updated azure-core minimum dependency to 1.23.0.

1.0.0 (2021-11-10)
Note: This is the first stable release of our efforts to create a user-friendly and Pythonic client library for Azure Schema Registry.
Features Added

SchemaRegistryClient is the top-level client class interacting with the Azure Schema Registry Service. It provides three methods:

register_schema: Store schema in the service by providing schema group name, schema name, schema definition, and schema format.
get_schema: Get schema definition and its properties by schema id.
get_schema_properties: Get schema properties by providing schema group name, schema name, schema definition, and schema format.

SchemaProperties has the following instance variables: id and format:

The type of format has been changed from str to SchemaFormat.

Schema has the following properties: properties and definition.
SchemaFormat provides the schema format to be stored by the service. Currently, the only supported format is Avro.
api_version has been added as a keyword arg to the sync and async SchemaRegistryClient constructors.

Breaking Changes

version instance variable in SchemaProperties has been removed.
schema_definition instance variable in Schema has been renamed definition.
id parameter in get_schema method on sync and async SchemaRegistryClient has been renamed schema_id.
schema_definition parameter in register_schema and get_schema_properties methods on sync and async SchemaRegistryClient has been renamed definition.
serializer namespace has been removed from azure.schemaregistry.

1.0.0b3 (2021-10-05)
Breaking Changes

get_schema_id method on sync and async SchemaRegistryClient has been renamed get_schema_properties.
schema_id parameter in get_schema method on sync and async SchemaRegistryClient has been renamed id.
register_schema and get_schema_properties methods on sync and async SchemaRegistryClient now take in the following parameters in the given order:

group_name, which has been renamed from schema_group
name, which has been renamed from schema_name
schema_definition, which has been renamed from schema_content
format, which has been renamed from serialization_type

endpoint parameter in SchemaRegistryClient constructor has been renamed fully_qualified_namespace
location instance variable in SchemaProperties has been removed.
Schema and SchemaProperties no longer have positional parameters, as they will not be constructed by the user.

Other Changes

Updated azure-core dependency to 1.19.0.
Removed caching support of registered schemas so requests are sent to the service to register schemas, get schema properties, and get schemas.

1.0.0b2 (2021-08-17)
This version and all future versions will require Python 2.7 or Python 3.6+, Python 3.5 is no longer supported.
Features Added

Support caching of registered schemas and send requests to the service only if the cache does not have the looked-up schema/schema ID.

1.0.0b1 (2020-09-09)
Version 1.0.0b1 is the first preview of our efforts to create a user-friendly and Pythonic client library for Azure Schema Registry.
New features

SchemaRegistryClient is the top-level client class interacting with the Azure Schema Registry Service. It provides three methods:

register_schema: Store schema into the service.
get_schema: Get schema content and its properties by schema id.
get_schema_id: Get schema id and its properties by schema group, schema name, serialization type and schema content.