feat(storage): profile-based S3 auth and hive-partitioned datasets - #2
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Read/write data to S3-compatible storage (SwitchCloud) using ~/.aws/credentials profiles, plus a polars-based layer for hive-partitioned Parquet datasets that scale to large tables. - credentials.py: shared resolve_s3_credentials() used by both the boto3 client and the PyArrow filesystem. Precedence: named profile from ~/.aws/credentials, then explicit keys, then S3_* env vars. - dataset.py: get_s3_filesystem(), write_dataset(), read_dataset() for hive-partitioned Parquet with polars; filters prune partitions. - s3.py: get_s3_client() gains a `profile` argument. - storage/README.md: usage guide incl. local-CSV -> partitioned Parquet. - Add polars + pyarrow to the `storage` extra; tests for both.
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What & why
Adds a small library to read/write data to Switch Cloud S3 using
~/.aws/credentialsprofiles, plus a scalable Hive-partitioned Parquet dataset layer (using polars).Changes
storage/credentials.py(new, shared) —resolve_s3_credentials(profile, key_id, key_secret)→S3Credentials. Precedence: namedprofilefrom~/.aws/credentials→ explicit keys →S3_ACCESS_KEY_ID/S3_SECRET_ACCESS_KEY. Used by both the boto3 client and the PyArrow filesystem.storage/dataset.py(new) — Hive-partitioned datasets:get_s3_filesystem(endpoint_url, profile=...)→pyarrow.fs.S3FileSystembound to the Switch endpoint.write_dataset(df, fs, bucket, path, partition_cols=[...])— polarsDataFrame/ArrowTable→col=value/partitioned Parquet.read_dataset(fs, bucket, path, columns=..., filters=...)→ polarsDataFrame, with partition pruning viapyarrow.dataset.field(...).storage/s3.py—get_s3_clientgains aprofileargument; credential logic delegated to the shared resolver.storage/README.md(new) — usage guide incl. a local-CSV → partitioned-Parquet-on-S3 walkthrough. Top-levelREADME.mdupdated.pyproject.toml—storageextra now includespolars>=1.0andpyarrow>=15.0.tests/test_dataset.py(new) — round-trips, partition pruning, column projection, credential resolution (incl. profile from a shared-credentials file).Notes
profileis the first credential arg ofget_s3_client, soget_s3_client(endpoint, key_id, key_secret)positionally now needs keywords. Happy to moveprofilelast if preferred./stripped (would silently write to the cwd).Testing
70 tests pass;
ruff check .clean.