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import boto3
from botocore.exceptions import ClientError
import pandas as pd
import pyarrow.parquet as pq
from io import BytesIO
import logging
logger = logging.getLogger(__name__)
logging.basicConfig(
format="{asctime} - {levelname} - {message}",
style="{",
datefmt="%Y-%m-%d %H:%M",
level=logging.DEBUG,
)
logging.getLogger("botocore").setLevel(logging.WARNING)
# list and then retrieve parquet files from S3 bucket
# convert parquet files into dataframes and return a list of dataframes
def convert_parquet_files_to_dfs(bucket_name=None, client=None):
try:
if client is None:
client = boto3.client("s3")
if bucket_name is None:
bucket_name = "transform_bucket"
files = client.list_objects_v2(Bucket=bucket_name)
dfs = []
if "Contents" in files:
for file in files["Contents"]:
file_key = file['Key']
try:
file_obj = client.get_object(Bucket=bucket_name, Key=file_key)
parquet_file = pq.ParquetFile(BytesIO(file_obj['Body'].read()))
df = parquet_file.read().to_pandas()
dfs.append(df)
except ClientError as e:
logger.error(f"Unable to retrieve S3 object {file_key}: {e}")
except Exception as e:
logger.error(f"Unable to process file {file_key}: {e}")
else:
logger.error(f"No files found in {bucket_name}.")
return []
except ValueError as value_error:
logger.error(f"Unable to list objects: {value_error}")
raise
except ClientError as client_error:
logger.error(f"Unable to list objects: {client_error}")
raise
return dfs
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