Add Parquet dataset upload endpoint

pyproject.toml

@@ -20,6 +20,9 @@ dependencies = [
     "mysqlclient",
     "python_dotenv",
     "xmltodict",
+    "pyarrow>=14.0",
+    "boto3>=1.34",
+    "python-multipart>=0.0.9",
 ]
 
 [project.optional-dependencies]

src/config.py

@@ -79,3 +79,7 @@ def load_database_configuration(file: Path = _config_file) -> TomlTable:
 
 def load_configuration(file: Path = _config_file) -> TomlTable:
     return tomllib.loads(file.read_text())
+
+
+def load_minio_configuration(file: Path = _config_file) -> TomlTable:
+    return typing.cast("TomlTable", _load_configuration(file).get("minio", {}))

src/config.toml

@@ -22,3 +22,11 @@ database="openml"
 [routing]
 minio_url="http://minio:9000/"
 server_url="http://php-api:80/"
+
+[minio]
+endpoint_url="http://minio:9000"
+bucket="datasets"
+# Credentials should be provided via environment variables:
+# OPENML_MINIO_ACCESS_KEY and OPENML_MINIO_SECRET_KEY
+access_key="minioadmin"
+secret_key="minioadmin"

src/core/parquet.py

@@ -0,0 +1,77 @@
+from __future__ import annotations
+
+import hashlib
+import io
+from dataclasses import dataclass, field
+
+import pyarrow as pa
+import pyarrow.parquet as pq
+
+from schemas.datasets.openml import FeatureType
+
+
+def map_arrow_type(arrow_type: pa.DataType) -> FeatureType:
+    """Map a PyArrow DataType to an OpenML FeatureType."""
+    if pa.types.is_floating(arrow_type) or pa.types.is_integer(arrow_type) or pa.types.is_decimal(
+        arrow_type
+    ):
+        return FeatureType.NUMERIC
+    if pa.types.is_boolean(arrow_type) or pa.types.is_dictionary(arrow_type):
+        return FeatureType.NOMINAL
+    return FeatureType.STRING
+
+
+@dataclass
+class ColumnMeta:
+    index: int
+    name: str
+    data_type: FeatureType
+    number_of_missing_values: int
+
+
+@dataclass
+class ParquetMeta:
+    num_rows: int
+    num_columns: int
+    md5_checksum: str
+    columns: list[ColumnMeta] = field(default_factory=list)
+
+
+def read_parquet_metadata(file_bytes: bytes) -> ParquetMeta:
+    """Parse *file_bytes* as Parquet and extract schema / quality metadata.
+
+    Raises ``ValueError`` if the bytes are not a valid Parquet file.
+    """
+    try:
+        buf = io.BytesIO(file_bytes)
+        pf = pq.ParquetFile(buf)
+    except Exception as exc:
+        msg = "File is not a valid Parquet file."
+        raise ValueError(msg) from exc
+
+    schema = pf.schema_arrow
+    num_rows = pf.metadata.num_rows
+    md5 = hashlib.md5(file_bytes, usedforsecurity=False).hexdigest()  # noqa: S324
+
+    # Read full table once to count per-column nulls
+    table = pf.read()
+
+    columns: list[ColumnMeta] = []
+    for idx, col_name in enumerate(schema.names):
+        col = table.column(col_name)
+        null_count = col.null_count
+        columns.append(
+            ColumnMeta(
+                index=idx,
+                name=col_name,
+                data_type=map_arrow_type(schema.field(col_name).type),
+                number_of_missing_values=null_count,
+            )
+        )
+
+    return ParquetMeta(
+        num_rows=num_rows,
+        num_columns=len(columns),
+        md5_checksum=md5,
+        columns=columns,
+    )

src/core/storage.py

@@ -0,0 +1,59 @@
+from __future__ import annotations
+
+import io
+import logging
+import os
+from typing import TYPE_CHECKING
+
+import boto3
+from botocore.exceptions import BotoCoreError, ClientError
+
+from config import _load_configuration, _config_file
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
+logger = logging.getLogger(__name__)
+
+MINIO_ACCESS_KEY_ENV = "OPENML_MINIO_ACCESS_KEY"
+MINIO_SECRET_KEY_ENV = "OPENML_MINIO_SECRET_KEY"  # noqa: S105
+
+
+def _minio_config(file: Path = _config_file) -> dict[str, str]:
+    cfg = _load_configuration(file).get("minio", {})
+    return {
+        "endpoint_url": cfg.get("endpoint_url", "http://minio:9000"),
+        "bucket": cfg.get("bucket", "datasets"),
+        "access_key": os.environ.get(MINIO_ACCESS_KEY_ENV, cfg.get("access_key", "minioadmin")),
+        "secret_key": os.environ.get(MINIO_SECRET_KEY_ENV, cfg.get("secret_key", "minioadmin")),
+    }
+
+
+def _object_key(dataset_id: int) -> str:
+    """Return the MinIO object key for a dataset, matching the existing URL pattern."""
+    ten_thousands_prefix = f"{dataset_id // 10_000:04d}"
+    padded_id = f"{dataset_id:04d}"
+    return f"datasets/{ten_thousands_prefix}/{padded_id}/dataset_{dataset_id}.pq"
+
+
+def upload_to_minio(file_bytes: bytes, dataset_id: int) -> str:
+    """Upload *file_bytes* to MinIO and return the object key.
+
+    Raises ``RuntimeError`` on upload failure so callers can convert to HTTP 500.
+    """
+    cfg = _minio_config()
+    key = _object_key(dataset_id)
+    try:
+        client = boto3.client(
+            "s3",
+            endpoint_url=cfg["endpoint_url"],
+            aws_access_key_id=cfg["access_key"],
+            aws_secret_access_key=cfg["secret_key"],
+        )
+        client.upload_fileobj(io.BytesIO(file_bytes), cfg["bucket"], key)
+        logger.info("Uploaded dataset %d to MinIO at key '%s'", dataset_id, key)
+    except (BotoCoreError, ClientError) as exc:
+        msg = f"Failed to upload dataset {dataset_id} to MinIO: {exc}"
+        logger.exception(msg)
+        raise RuntimeError(msg) from exc
+    return key

src/database/datasets.py

@@ -178,3 +178,160 @@ def remove_deactivated_status(dataset_id: int, connection: Connection) -> None:
         ),
         parameters={"data": dataset_id},
     )
+
+
+def insert_file(
+    *,
+    file_name: str,
+    reference: str,
+    md5_hash: str,
+    connection: Connection,
+) -> int:
+    """Insert a row into the `file` table and return the new file id."""
+    connection.execute(
+        text(
+            """
+            INSERT INTO file(`name`, `reference`, `md5_hash`)
+            VALUES (:name, :reference, :md5_hash)
+            """,
+        ),
+        parameters={"name": file_name, "reference": reference, "md5_hash": md5_hash},
+    )
+    result = connection.execute(text("SELECT LAST_INSERT_ID()"))
+    (file_id,) = result.one()
+    return int(file_id)
+
+
+def insert_dataset(  # noqa: PLR0913
+    *,
+    name: str,
+    description: str,
+    format_: str,
+    file_id: int,
+    uploader: int,
+    visibility: str,
+    licence: str,
+    language: str,
+    default_target_attribute: str,
+    original_data_url: str,
+    paper_url: str,
+    collection_date: str,
+    citation: str,
+    md5_checksum: str,
+    connection: Connection,
+) -> int:
+    """Insert a row into the `dataset` table and return the new dataset id."""
+    connection.execute(
+        text(
+            """
+            INSERT INTO dataset(
+                `name`, `description`, `format`, `file_id`, `uploader`,
+                `visibility`, `licence`, `language`,
+                `default_target_attribute`, `original_data_url`, `paper_url`,
+                `collection_date`, `citation`, `md5_checksum`,
+                `version`, `upload_date`
+            )
+            VALUES (
+                :name, :description, :format, :file_id, :uploader,
+                :visibility, :licence, :language,
+                :default_target_attribute, :original_data_url, :paper_url,
+                :collection_date, :citation, :md5_checksum,
+                1, NOW()
+            )
+            """,
+        ),
+        parameters={
+            "name": name,
+            "description": description,
+            "format": format_,
+            "file_id": file_id,
+            "uploader": uploader,
+            "visibility": visibility,
+            "licence": licence,
+            "language": language,
+            "default_target_attribute": default_target_attribute,
+            "original_data_url": original_data_url,
+            "paper_url": paper_url,
+            "collection_date": collection_date,
+            "citation": citation,
+            "md5_checksum": md5_checksum,
+        },
+    )
+    result = connection.execute(text("SELECT LAST_INSERT_ID()"))
+    (dataset_id,) = result.one()
+    return int(dataset_id)
+
+
+def insert_description(
+    *,
+    dataset_id: int,
+    description: str,
+    connection: Connection,
+) -> None:
+    """Insert the initial description into the `dataset_description` table."""
+    connection.execute(
+        text(
+            """
+            INSERT INTO dataset_description(`did`, `description`, `version`)
+            VALUES (:did, :description, 1)
+            """,
+        ),
+        parameters={"did": dataset_id, "description": description},
+    )
+
+
+def insert_features(
+    *,
+    dataset_id: int,
+    features: list[dict[str, object]],
+    connection: Connection,
+) -> None:
+    """Bulk-insert feature rows into `data_feature`.
+
+    Each dict in *features* must have: index, name, data_type, is_target,
+    is_row_identifier, is_ignore, number_of_missing_values.
+    """
+    if not features:
+        return
+    for feat in features:
+        connection.execute(
+            text(
+                """
+                INSERT INTO data_feature(
+                    `did`, `index`, `name`, `data_type`,
+                    `is_target`, `is_row_identifier`, `is_ignore`,
+                    `NumberOfMissingValues`
+                )
+                VALUES (
+                    :did, :index, :name, :data_type,
+                    :is_target, :is_row_identifier, :is_ignore,
+                    :number_of_missing_values
+                )
+                """,
+            ),
+            parameters={"did": dataset_id, **feat},
+        )
+
+
+def insert_qualities(
+    *,
+    dataset_id: int,
+    qualities: list[dict[str, object]],
+    connection: Connection,
+) -> None:
+    """Insert quality rows into `data_quality`.
+
+    Each dict must have: quality (str), value (float | None).
+    """
+    if not qualities:
+        return
+    for q in qualities:
+        connection.execute(
+            text(
+                """
+                INSERT INTO data_quality(`data`, `quality`, `value`)
+                VALUES (:data, :quality, :value)
+                """,
+            ),
+            parameters={"data": dataset_id, **q},
+        )