def download_dump(self, filename, directory):
""" Download file with `filename` from FTP.
Args:
filename (str): File name of FTP dump.
directory (str): Dir to save dump locally.
Returns:
dest_path (str): Local path where dump has been downloaded.
"""
# Check if sha256 is present to validate the download, if not present don't download
sha_filename = filename + '.sha256'
dir_content = self.list_dir()
sha_dest_path = os.path.join(directory, sha_filename)
if sha_filename in dir_content:
self.download_file_binary(sha_filename, sha_dest_path)
else:
raise DumpInvalidException("SHA256 checksum for the given file missing, aborting download.")
dest_path = os.path.join(directory, filename)
self.download_file_binary(filename, dest_path)
logger.info("Verifying dump integrity...")
calculated_sha = self._calc_sha256(dest_path)
received_sha = self._read_sha_file(sha_dest_path)
os.remove(sha_dest_path)
if calculated_sha != received_sha:
# Cleanup
os.remove(dest_path)
raise DumpInvalidException("""Received SHA256 checksum doesn't match the calculated checksum, aborting.
Calculated SHA: {calculated_sha}. Received SHA: {received_sha}""".format(
calculated_sha=calculated_sha, received_sha=received_sha))
self.connection.cwd('/')
return dest_path
def mock_import_dump_to_hdfs_error(dump_id: int):
""" Mock function returning dump name all dump ids less than 210, else raise DumpInvalidException"""
if (dump_id < 210) or (dump_id > 210 and dump_id < 213):
return f"listenbrainz-spark-dump-{dump_id}-incremental.tar"
elif dump_id == 210:
raise DumpInvalidException("Invalid Dump")
else:
raise DumpNotFoundException("Dump not found")
def extract_and_upload_archive(self,
archive,
local_dir,
hdfs_dir,
cleanup_on_failure=True):
"""
Extract the archive and upload it to the given hdfs directory.
Args:
archive: path to the tar archive to uploaded
local_dir: path to local dir to be used for extraction
hdfs_dir: path to hdfs dir where contents of tar should be uploaded
cleanup_on_failure: whether to delete local and hdfs directories
if error occurs during extraction
"""
total_files = 0
total_time = 0.0
with tarfile.open(archive, mode='r') as tar:
for member in tar:
if member.isfile() and member.name.endswith(".parquet"):
logger.info(f"Uploading {member.name}...")
t0 = time.monotonic()
try:
tar.extract(member, path=local_dir)
except tarfile.TarError as err:
if cleanup_on_failure:
if utils.path_exists(hdfs_dir):
utils.delete_dir(hdfs_dir, recursive=True)
shutil.rmtree(local_dir, ignore_errors=True)
raise DumpInvalidException(
f"{type(err).__name__} while extracting {member.name}, aborting import"
)
hdfs_path = os.path.join(hdfs_dir, member.name)
local_path = os.path.join(local_dir, member.name)
utils.upload_to_HDFS(hdfs_path, local_path)
time_taken = time.monotonic() - t0
total_files += 1
total_time += time_taken
logger.info(
f"Done! Current file processed in {time_taken:.2f} sec"
)
logger.info(
f"Done! Total files processed {total_files}. Average time taken: {total_time / total_files:.2f}"
)
def upload_archive(self,
tmp_dump_dir,
tar,
dest_path,
schema,
callback=None,
overwrite=False):
""" Upload data dump to HDFS.
Args:
tmp_dump_dir (str): Path to temporary directory to upload JSON.
tar: Uncompressed tar object.
dest_path (str): HDFS path to upload data dump.
schema: Schema of parquet to be uploaded.
callback: Function to process JSON files.
overwrite: If True deletes dir at dest_path
"""
if callback is None:
raise NotImplementedError(
'Callback to process JSON missing. Aborting...')
# Delete TEMP_DIR_PATH if it exists
if utils.path_exists(TEMP_DIR_PATH):
utils.delete_dir(TEMP_DIR_PATH, recursive=True)
# Copy data from dest_path to TEMP_DIR_PATH to be merged with new data
if not overwrite and utils.path_exists(dest_path):
t0 = time.monotonic()
logger.info("Copying old listens into '{}'".format(TEMP_DIR_PATH))
utils.copy(dest_path, TEMP_DIR_PATH, overwrite=True)
logger.info("Done! Time taken: {:.2f}".format(time.monotonic() -
t0))
logger.info("Uploading listens to temporary directory in HDFS...")
total_files = 0
total_time = 0.0
for member in tar:
if member.isfile() and self._is_json_file(member.name):
logger.info("Uploading {}...".format(member.name))
t0 = time.monotonic()
try:
tar.extract(member)
except TarError as err:
# Cleanup
if utils.path_exists(TEMP_DIR_PATH):
utils.delete_dir(TEMP_DIR_PATH, recursive=True)
if utils.path_exists(tmp_dump_dir):
utils.delete_dir(tmp_dump_dir, recursive=True)
raise DumpInvalidException(
"{} while extracting {}, aborting import".format(
type(err).__name__, member.name))
tmp_hdfs_path = os.path.join(tmp_dump_dir, member.name)
utils.upload_to_HDFS(tmp_hdfs_path, member.name)
callback(member.name, TEMP_DIR_PATH, tmp_hdfs_path,
not overwrite, schema)
utils.delete_dir(tmp_hdfs_path, recursive=True)
os.remove(member.name)
time_taken = time.monotonic() - t0
total_files += 1
total_time += time_taken
logger.info(
"Done! Current file processed in {:.2f} sec".format(
time_taken))
logger.info(
"Done! Total files processed {}. Average time taken: {:.2f}".
format(total_files, total_time / total_files))
# Delete dest_path if present
if utils.path_exists(dest_path):
logger.info('Removing {} from HDFS...'.format(dest_path))
utils.delete_dir(dest_path, recursive=True)
logger.info('Done!')
logger.info("Moving the processed files to {}".format(dest_path))
t0 = time.monotonic()
# Check if parent directory exists, if not create a directory
dest_path_parent = pathlib.Path(dest_path).parent
if not utils.path_exists(dest_path_parent):
utils.create_dir(dest_path_parent)
utils.rename(TEMP_DIR_PATH, dest_path)
utils.logger.info("Done! Time taken: {:.2f}".format(time.monotonic() -
t0))
# Cleanup
utils.delete_dir(tmp_dump_dir, recursive=True)