avro_gen_python_class_binary_serialization_quickstart.py

python

Generates Python class definitions from an Avro schema and demonstrates how to

15d ago31 lines

jcrawfordorourke/avro-gen

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avro_gen_python_class_binary_serialization_quickstart.py
import io
from avro.io import DatumWriter, DatumReader, BinaryEncoder, BinaryDecoder
# Note: 'schema_classes' is the default output module name when using the avro-gen CLI
# to generate code from a .avsc file.
import schema_classes 

# 1. Create an instance of a generated class
user = schema_classes.User(
    name="John Doe",
    favorite_number=42,
    favorite_color="blue"
)

# 2. Serialize the object to binary
out = io.BytesIO()
writer = DatumWriter(schema_classes.User.RECORD_SCHEMA)
encoder = BinaryEncoder(out)
writer.write(user, encoder)
raw_bytes = out.getvalue()

# 3. Deserialize the binary back into an object
ins = io.BytesIO(raw_bytes)
reader = DatumReader(schema_classes.User.RECORD_SCHEMA)
decoder = BinaryDecoder(ins)
new_user_dict = reader.read(decoder)

# 4. Re-instantiate the generated class from the resulting dictionary
new_user = schema_classes.User(new_user_dict)

print(f"Name: {new_user.name}")
print(f"Favorite Number: {new_user.favorite_number}")