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.
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Azure SDK Python packages support for Python 2.7 has ended on 01 January 2022. For more information and questions, please refer to #20691
Install the Azure Schema Registry client library for Python with pip:
pip install azure-schemaregistry
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
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 byazure-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)
-
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.
The following sections provide several code snippets covering some of the most common Schema Registry tasks, including:
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 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 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 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
Schema Registry clients raise exceptions defined in Azure Core.
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)
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.
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