lang/py/avro/test/gen_interop_data.py

#!/usr/bin/env python3

##
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
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import argparse
import base64
import io
import json
import os
from pathlib import Path
from typing import IO, TextIO

import avro.codecs
import avro.datafile
import avro.io
import avro.schema

NULL_CODEC = avro.datafile.NULL_CODEC
CODECS_TO_VALIDATE = avro.codecs.KNOWN_CODECS.keys()

DATUM = {
    "intField": 12,
    "longField": 15234324,
    "stringField": "hey",
    "boolField": True,
    "floatField": 1234.0,
    "doubleField": -1234.0,
    "bytesField": b"12312adf",
    "nullField": None,
    "arrayField": [5.0, 0.0, 12.0],
    "mapField": {"a": {"label": "a"}, "bee": {"label": "cee"}},
    "unionField": 12.0,
    "enumField": "C",
    "fixedField": b"1019181716151413",
    "recordField": {"label": "blah", "children": [{"label": "inner", "children": []}]},
}


def gen_data(codec: str, datum_writer: avro.io.DatumWriter, interop_schema: avro.schema.Schema) -> bytes:
    with io.BytesIO() as file_, avro.datafile.DataFileWriter(file_, datum_writer, interop_schema, codec=codec) as dfw:
        dfw.set_meta("user_metadata", b"someByteArray")
        dfw.append(DATUM)
        dfw.flush()
        return file_.getvalue()


def generate(schema_file: TextIO, output_path: IO) -> None:
    interop_schema = avro.schema.parse(schema_file.read())
    datum_writer = avro.io.DatumWriter()
    output = ((codec, gen_data(codec, datum_writer, interop_schema)) for codec in CODECS_TO_VALIDATE)
    if output_path.isatty():
        json.dump({codec: base64.b64encode(data).decode() for codec, data in output}, output_path)
        return
    for codec, data in output:
        if codec == NULL_CODEC:
            output_path.write(data)
            continue
        base, ext = os.path.splitext(output_path.name)
        Path(f"{base}_{codec}{ext}").write_bytes(data)


def _parse_args() -> argparse.Namespace:
    """Parse the command-line arguments"""
    parser = argparse.ArgumentParser()
    parser.add_argument("schema_path", type=argparse.FileType("r"))
    parser.add_argument(
        "output_path",
        type=argparse.FileType("wb"),
        help=(
            "Write the different codec variants to these files. "
            "Will append codec extensions to multiple files. "
            "If '-', will output base64 encoded binary"
        ),
    )
    return parser.parse_args()


def main() -> int:
    args = _parse_args()
    generate(args.schema_path, args.output_path)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())