Created
March 29, 2023 07:36
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Real Experiment of AVRO and Schema Registry
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from copy import deepcopy | |
import json | |
from confluent_kafka.schema_registry import SchemaRegistryClient | |
from confluent_kafka.schema_registry.avro import AvroSerializer, AvroDeserializer | |
from confluent_kafka.serialization import StringSerializer, SerializationContext, MessageField | |
KAFKA_HOST = 'localhost' | |
schema_registry_conf = {'url': f'http://{KAFKA_HOST}:8081'} | |
schema_registry_client = SchemaRegistryClient(schema_registry_conf) | |
schema_registry_client.get_subjects() | |
# ['BACKWARD', 'FORWARD', 'FULL', 'BACKWARD_TRANSITIVE', 'FORWARD_TRANSITIVE', 'FULL_TRANSITIVE'] | |
comp = 'BACKWARD' | |
topic = namespace = f'example.test.{comp}' | |
schema_registry_client.set_compatibility(level=comp) | |
ver0 = { | |
'type': 'record', | |
'name': 'Person', | |
'namespace': namespace, | |
'fields': [ | |
{'name': 'name', 'type': 'string'} | |
] | |
} | |
ver1 = { | |
'type': 'record', | |
'name': 'Person', | |
'namespace': namespace, | |
'fields': [ | |
{'name': 'name', 'type': 'string', 'default': '<DEPRECATED>'}, | |
] | |
} | |
ver2 = { | |
'type': 'record', | |
'name': 'Person', | |
'namespace': namespace, | |
'fields': [ | |
{'name': 'name', 'type': 'string', 'default': '<DEPRECATED>'}, | |
{ | |
'name': 'person_name', | |
'type': { | |
'name': 'Name', | |
'type': 'record', | |
'fields': [ | |
{'name': 'first_name', 'type': 'string', 'default': '<NOT_IN_USE>'}, | |
{'name': 'last_name', 'type': 'string', 'default': '<NOT_IN_USE>'} | |
] | |
}, | |
'default': {'first_name': '<??>', 'last_name': '<??>'} | |
} | |
] | |
} | |
ver3 = { | |
'type': 'record', | |
'name': 'Person', | |
'namespace': namespace, | |
'fields': [ | |
{ | |
'name': 'person_name', | |
'type': { | |
'name': 'Name', | |
'type': 'record', | |
'fields': [ | |
{'name': 'first_name', 'type': 'string', 'default': '<NOT_IN_USE>'}, | |
{'name': 'last_name', 'type': 'string', 'default': '<NOT_IN_USE>'} | |
] | |
}, | |
'default': {'first_name': '<??>', 'last_name': '<??>'} | |
} | |
] | |
} | |
ver4 = { | |
'type': 'record', | |
'name': 'Person', | |
'namespace': namespace, | |
'fields': [ | |
{ | |
'name': 'person_name', | |
'type': { | |
'name': 'Name', | |
'type': 'record', | |
'fields': [ | |
{'name': 'first_name', 'type': 'string'}, | |
{'name': 'last_name', 'type': 'string'} | |
] | |
} | |
} | |
] | |
} | |
ver5 = { | |
'type': 'record', | |
'name': 'Person', | |
'namespace': namespace, | |
'fields': [ | |
{ | |
'name': 'person_name', | |
'type': { | |
'name': 'Name', | |
'type': 'record', | |
'fields': [ | |
{'name': 'first_name', 'type': 'string'}, | |
{'name': 'last_name', 'type': 'string'} | |
] | |
}, | |
'aliases': ['name'] | |
} | |
] | |
} | |
def serialize_and_deserialize(data, schema, recv_schema=None): | |
avro_serializer = AvroSerializer(schema_registry_client, json.dumps(schema)) | |
value = avro_serializer(data, SerializationContext(topic, MessageField.VALUE)) | |
if recv_schema: | |
avro_deserializer = AvroDeserializer(schema_registry_client, json.dumps(recv_schema)) | |
else: | |
avro_deserializer = AvroDeserializer(schema_registry_client) | |
return avro_deserializer(value, SerializationContext(topic, MessageField.VALUE)) | |
user1 = { | |
'name': 'John Smith' | |
} | |
user2 = { | |
'name': 'John Smith', | |
'person_name': { | |
'first_name': 'John', | |
'last_name': 'Smith' | |
} | |
} | |
user3 = { | |
'person_name': { | |
'first_name': 'John', | |
'last_name': 'Smith' | |
} | |
} | |
user4 = { | |
'person_name': { | |
'first_name': 'John', | |
'last_name': 'Smith' | |
} | |
} | |
user5 = { | |
'person_name': { | |
'first_name': 'John', | |
'last_name': 'Smith' | |
} | |
} | |
print("Align Producer testing...") | |
print(serialize_and_deserialize(user1, ver0)) | |
print(serialize_and_deserialize(user1, ver1)) | |
print(serialize_and_deserialize(user2, ver2)) | |
print(serialize_and_deserialize(user3, ver3)) | |
print(serialize_and_deserialize(user4, ver4)) | |
print(serialize_and_deserialize(user5, ver5)) | |
print("BACKWARD testing...") | |
print(serialize_and_deserialize(user1, ver1, ver1)) | |
print(serialize_and_deserialize(user2, ver2, ver1)) | |
print(serialize_and_deserialize(user3, ver3, ver1)) | |
print(serialize_and_deserialize(user4, ver4, ver1)) | |
print(serialize_and_deserialize(user5, ver5, ver1)) | |
print("Late One Ver testing...") | |
print(serialize_and_deserialize(user1, ver1, ver0)) | |
print(serialize_and_deserialize(user2, ver2, ver1)) | |
print(serialize_and_deserialize(user3, ver3, ver2)) | |
print(serialize_and_deserialize(user4, ver4, ver3)) | |
print(serialize_and_deserialize(user5, ver5, ver4)) |
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