nexrad-archive/lib/nexrad/archive.py

import os

from nexrad.s3 import S3Bucket

class Archive():
    path:   str
    bucket: S3Bucket

    def __init__(self, path: str, bucket: S3Bucket):
        self.path   = path
        self.bucket = bucket

    def is_archived(self, key: str):
        return os.path.exists(os.path.join(self.path, key))

    def archive(self, key: str):
        path   = os.path.join(self.path, key)
        parent = os.path.dirname(path)

        os.makedirs(parent, exist_ok=True)

        with open(path, 'wb') as fh:
            self.bucket.s3.download_fileobj(self.bucket.name, key, fh)