feat: add a custom storage options param

README.md

@@ -209,6 +209,21 @@ for batch in dataloader:
 
 ```
 
+
+Additionally, you can inject client connection settings for [S3](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/core/session.html#boto3.session.Session.client) or GCP when initializing your dataset. This is useful for specifying custom endpoints and credentials per dataset.
+
+```python
+from litdata import StreamingDataset
+
+storage_options = {
+    "endpoint_url": "your_endpoint_url",
+    "aws_access_key_id": "your_access_key_id",
+    "aws_secret_access_key": "your_secret_access_key",
+}
+
+dataset = StreamingDataset('s3://my-bucket/my-data', storage_options=storage_options)
+```
+
 </details>  
 
 <details>

src/litdata/streaming/cache.py

@@ -45,6 +45,7 @@ def __init__(
         max_cache_size: Union[int, str] = "100GB",
         serializers: Optional[Dict[str, Serializer]] = None,
         writer_chunk_index: Optional[int] = None,
+        storage_options: Optional[Dict] = {},
     ):
         """The Cache enables to optimise dataset format for cloud training. This is done by grouping several elements
         together in order to accelerate fetching.
@@ -60,6 +61,7 @@ def __init__(
             max_cache_size: The maximum cache size used by the reader when fetching the chunks.
             serializers: Provide your own serializers.
             writer_chunk_index: The index of the chunk to start from when writing.
+            storage_options: Additional connection options for accessing storage services.
 
         """
         super().__init__()
@@ -85,6 +87,7 @@ def __init__(
             encryption=encryption,
             item_loader=item_loader,
             serializers=serializers,
+            storage_options=storage_options,
         )
         self._is_done = False
         self._distributed_env = _DistributedEnv.detect()

src/litdata/streaming/client.py

@@ -13,7 +13,7 @@
 
 import os
 from time import time
-from typing import Any, Optional
+from typing import Any, Dict, Optional
 
 import boto3
 import botocore
@@ -26,10 +26,11 @@
 class S3Client:
     # TODO: Generalize to support more cloud providers.
 
-    def __init__(self, refetch_interval: int = 3300) -> None:
+    def __init__(self, refetch_interval: int = 3300, storage_options: Optional[Dict] = {}) -> None:
         self._refetch_interval = refetch_interval
         self._last_time: Optional[float] = None
         self._client: Optional[Any] = None
+        self._storage_options: dict = storage_options or {}
 
     def _create_client(self) -> None:
         has_shared_credentials_file = (
@@ -38,7 +39,11 @@ def _create_client(self) -> None:
 
         if has_shared_credentials_file or not _IS_IN_STUDIO:
             self._client = boto3.client(
-                "s3", config=botocore.config.Config(retries={"max_attempts": 1000, "mode": "adaptive"})
+                "s3",
+                **{
+                    "config": botocore.config.Config(retries={"max_attempts": 1000, "mode": "adaptive"}),
+                    **self._storage_options,
+                },
             )
         else:
             provider = InstanceMetadataProvider(iam_role_fetcher=InstanceMetadataFetcher(timeout=3600, num_attempts=5))

src/litdata/streaming/config.py

@@ -33,6 +33,7 @@ def __init__(
         item_loader: Optional[BaseItemLoader] = None,
         subsampled_files: Optional[List[str]] = None,
         region_of_interest: Optional[List[Tuple[int, int]]] = None,
+        storage_options: Optional[Dict] = {},
     ) -> None:
         """The ChunksConfig reads the index files associated a chunked dataset and enables to map an index to its
         chunk.
@@ -44,6 +45,7 @@ def __init__(
                 The scheme needs to be added to the path.
             subsampled_files: List of subsampled chunk files loaded from `input_dir/index.json` file.
             region_of_interest: List of tuples of {start,end} of region of interest for each chunk.
+            storage_options: Additional connection options for accessing storage services.
 
         """
         self._cache_dir = cache_dir
@@ -52,6 +54,7 @@ def __init__(
         self._chunks = None
         self._remote_dir = remote_dir
         self._item_loader = item_loader or PyTreeLoader()
+        self._storage_options = storage_options
 
         # load data from `index.json` file
         data = load_index_file(self._cache_dir)
@@ -75,7 +78,7 @@ def __init__(
         self._downloader = None
 
         if remote_dir:
-            self._downloader = get_downloader_cls(remote_dir, cache_dir, self._chunks)
+            self._downloader = get_downloader_cls(remote_dir, cache_dir, self._chunks, self._storage_options)
 
         self._compressor_name = self._config["compression"]
         self._compressor: Optional[Compressor] = None
@@ -234,17 +237,20 @@ def load(
         item_loader: Optional[BaseItemLoader] = None,
         subsampled_files: Optional[List[str]] = None,
         region_of_interest: Optional[List[Tuple[int, int]]] = None,
+        storage_options: Optional[dict] = {},
     ) -> Optional["ChunksConfig"]:
         cache_index_filepath = os.path.join(cache_dir, _INDEX_FILENAME)
 
         if isinstance(remote_dir, str):
-            downloader = get_downloader_cls(remote_dir, cache_dir, [])
+            downloader = get_downloader_cls(remote_dir, cache_dir, [], storage_options)
             downloader.download_file(os.path.join(remote_dir, _INDEX_FILENAME), cache_index_filepath)
 
         if not os.path.exists(cache_index_filepath):
             return None
 
-        return ChunksConfig(cache_dir, serializers, remote_dir, item_loader, subsampled_files, region_of_interest)
+        return ChunksConfig(
+            cache_dir, serializers, remote_dir, item_loader, subsampled_files, region_of_interest, storage_options
+        )
 
     def __len__(self) -> int:
         return self._length

src/litdata/streaming/dataset.py

@@ -54,6 +54,7 @@ def __init__(
         max_cache_size: Union[int, str] = "100GB",
         subsample: float = 1.0,
         encryption: Optional[Encryption] = None,
+        storage_options: Optional[Dict] = {},
     ) -> None:
         """The streaming dataset can be used once your data have been optimised using the DatasetOptimiser class.
 
@@ -70,6 +71,7 @@ def __init__(
             max_cache_size: The maximum cache size used by the StreamingDataset.
             subsample: Float representing fraction of the dataset to be randomly sampled (e.g., 0.1 => 10% of dataset).
             encryption: The encryption object to use for decrypting the data.
+            storage_options: Additional connection options for accessing storage services.
 
         """
         super().__init__()
@@ -85,7 +87,7 @@ def __init__(
         self.subsampled_files: List[str] = []
         self.region_of_interest: List[Tuple[int, int]] = []
         self.subsampled_files, self.region_of_interest = subsample_streaming_dataset(
-            self.input_dir, item_loader, subsample, shuffle, seed
+            self.input_dir, item_loader, subsample, shuffle, seed, storage_options
         )
 
         self.item_loader = item_loader
@@ -128,6 +130,7 @@ def __init__(
         self.num_workers: int = 1
         self.batch_size: int = 1
         self._encryption = encryption
+        self.storage_options = storage_options
 
     def set_shuffle(self, shuffle: bool) -> None:
         self.shuffle = shuffle
@@ -163,6 +166,7 @@ def _create_cache(self, worker_env: _WorkerEnv) -> Cache:
             serializers=self.serializers,
             max_cache_size=self.max_cache_size,
             encryption=self._encryption,
+            storage_options=self.storage_options,
         )
         cache._reader._try_load_config()
 

src/litdata/streaming/downloader.py

@@ -15,7 +15,7 @@
 import shutil
 import subprocess
 from abc import ABC
-from typing import Any, Dict, List
+from typing import Any, Dict, List, Optional
 from urllib import parse
 
 from filelock import FileLock, Timeout
@@ -25,10 +25,13 @@
 
 
 class Downloader(ABC):
-    def __init__(self, remote_dir: str, cache_dir: str, chunks: List[Dict[str, Any]]):
+    def __init__(
+        self, remote_dir: str, cache_dir: str, chunks: List[Dict[str, Any]], storage_options: Optional[Dict] = {}
+    ):
         self._remote_dir = remote_dir
         self._cache_dir = cache_dir
         self._chunks = chunks
+        self._storage_options = storage_options or {}
 
     def download_chunk_from_index(self, chunk_index: int) -> None:
         chunk_filename = self._chunks[chunk_index]["filename"]
@@ -41,12 +44,14 @@ def download_file(self, remote_chunkpath: str, local_chunkpath: str) -> None:
 
 
 class S3Downloader(Downloader):
-    def __init__(self, remote_dir: str, cache_dir: str, chunks: List[Dict[str, Any]]):
-        super().__init__(remote_dir, cache_dir, chunks)
+    def __init__(
+        self, remote_dir: str, cache_dir: str, chunks: List[Dict[str, Any]], storage_options: Optional[Dict] = {}
+    ):
+        super().__init__(remote_dir, cache_dir, chunks, storage_options)
         self._s5cmd_available = os.system("s5cmd > /dev/null 2>&1") == 0
 
         if not self._s5cmd_available:
-            self._client = S3Client()
+            self._client = S3Client(storage_options=self._storage_options)
 
     def download_file(self, remote_filepath: str, local_filepath: str) -> None:
         obj = parse.urlparse(remote_filepath)
@@ -88,11 +93,13 @@ def download_file(self, remote_filepath: str, local_filepath: str) -> None:
 
 
 class GCPDownloader(Downloader):
-    def __init__(self, remote_dir: str, cache_dir: str, chunks: List[Dict[str, Any]]):
+    def __init__(
+        self, remote_dir: str, cache_dir: str, chunks: List[Dict[str, Any]], storage_options: Optional[Dict] = {}
+    ):
         if not _GOOGLE_STORAGE_AVAILABLE:
             raise ModuleNotFoundError(str(_GOOGLE_STORAGE_AVAILABLE))
 
-        super().__init__(remote_dir, cache_dir, chunks)
+        super().__init__(remote_dir, cache_dir, chunks, storage_options)
 
     def download_file(self, remote_filepath: str, local_filepath: str) -> None:
         from google.cloud import storage
@@ -113,7 +120,7 @@ def download_file(self, remote_filepath: str, local_filepath: str) -> None:
                 if key[0] == "/":
                     key = key[1:]
 
-                client = storage.Client()
+                client = storage.Client(**self._storage_options)
                 bucket = client.bucket(bucket_name)
                 blob = bucket.blob(key)
                 blob.download_to_filename(local_filepath)
@@ -140,8 +147,10 @@ def download_file(self, remote_filepath: str, local_filepath: str) -> None:
 _DOWNLOADERS = {"s3://": S3Downloader, "gs://": GCPDownloader, "local:": LocalDownloaderWithCache, "": LocalDownloader}
 
 
-def get_downloader_cls(remote_dir: str, cache_dir: str, chunks: List[Dict[str, Any]]) -> Downloader:
+def get_downloader_cls(
+    remote_dir: str, cache_dir: str, chunks: List[Dict[str, Any]], storage_options: Optional[Dict] = {}
+) -> Downloader:
     for k, cls in _DOWNLOADERS.items():
         if str(remote_dir).startswith(k):
-            return cls(remote_dir, cache_dir, chunks)
+            return cls(remote_dir, cache_dir, chunks, storage_options)
     raise ValueError(f"The provided `remote_dir` {remote_dir} doesn't have a downloader associated.")

src/litdata/streaming/reader.py

@@ -169,6 +169,7 @@ def __init__(
         encryption: Optional[Encryption] = None,
         item_loader: Optional[BaseItemLoader] = None,
         serializers: Optional[Dict[str, Serializer]] = None,
+        storage_options: Optional[dict] = {},
     ) -> None:
         """The BinaryReader enables to read chunked dataset in an efficient way.
 
@@ -183,6 +184,7 @@ def __init__(
             item_loader: The chunk sampler to create sub arrays from a chunk.
             max_cache_size: The maximum cache size used by the reader when fetching the chunks.
             serializers: Provide your own serializers.
+            storage_options: Additional connection options for accessing storage services.
 
         """
         super().__init__()
@@ -207,6 +209,7 @@ def __init__(
         self._item_loader = item_loader or PyTreeLoader()
         self._last_chunk_index: Optional[int] = None
         self._max_cache_size = int(os.getenv("MAX_CACHE_SIZE", max_cache_size or 0))
+        self._storage_options = storage_options
 
     def _get_chunk_index_from_index(self, index: int) -> Tuple[int, int]:
         # Load the config containing the index
@@ -224,6 +227,7 @@ def _try_load_config(self) -> Optional[ChunksConfig]:
             self._item_loader,
             self.subsampled_files,
             self.region_of_interest,
+            self._storage_options,
         )
         return self._config
 

src/litdata/utilities/dataset_utilities.py

@@ -19,6 +19,7 @@ def subsample_streaming_dataset(
     subsample: float = 1.0,
     shuffle: bool = False,
     seed: int = 42,
+    storage_options: Optional[Dict] = {},
 ) -> Tuple[List[str], List[Tuple[int, int]]]:
     """Subsample streaming dataset.
 
@@ -46,7 +47,7 @@ def subsample_streaming_dataset(
     # Check if `index.json` file exists in cache path
     if not os.path.exists(cache_index_filepath) and isinstance(input_dir.url, str):
         assert input_dir.url is not None
-        downloader = get_downloader_cls(input_dir.url, input_dir.path, [])
+        downloader = get_downloader_cls(input_dir.url, input_dir.path, [], storage_options)
         downloader.download_file(os.path.join(input_dir.url, _INDEX_FILENAME), cache_index_filepath)
 
     if os.path.exists(os.path.join(input_dir.path, _INDEX_FILENAME)):

tests/streaming/test_client.py

@@ -6,6 +6,38 @@
 from litdata.streaming import client
 
 
+def test_s3_client_with_storage_options(monkeypatch):
+    boto3 = mock.MagicMock()
+    monkeypatch.setattr(client, "boto3", boto3)
+
+    botocore = mock.MagicMock()
+    monkeypatch.setattr(client, "botocore", botocore)
+
+    storage_options = {
+        "region_name": "us-west-2",
+        "endpoint_url": "https://custom.endpoint",
+        "config": botocore.config.Config(retries={"max_attempts": 100}),
+    }
+    s3_client = client.S3Client(storage_options=storage_options)
+
+    assert s3_client.client
+
+    boto3.client.assert_called_with(
+        "s3",
+        region_name="us-west-2",
+        endpoint_url="https://custom.endpoint",
+        config=botocore.config.Config(retries={"max_attempts": 100}),
+    )
+
+    s3_client = client.S3Client()
+
+    assert s3_client.client
+
+    boto3.client.assert_called_with(
+        "s3", config=botocore.config.Config(retries={"max_attempts": 1000, "mode": "adaptive"})
+    )
+
+
 def test_s3_client_without_cloud_space_id(monkeypatch):
     boto3 = mock.MagicMock()
     monkeypatch.setattr(client, "boto3", boto3)

tests/streaming/test_downloader.py

@@ -36,11 +36,13 @@ def test_gcp_downloader(tmpdir, monkeypatch, google_mock):
     mock_bucket.blob = MagicMock(return_value=mock_blob)
 
     # Initialize the downloader
-    downloader = GCPDownloader("gs://random_bucket", tmpdir, [])
+    storage_options = {"project": "DUMMY_PROJECT"}
+    downloader = GCPDownloader("gs://random_bucket", tmpdir, [], storage_options)
     local_filepath = os.path.join(tmpdir, "a.txt")
     downloader.download_file("gs://random_bucket/a.txt", local_filepath)
 
     # Assert that the correct methods were called
+    google_mock.cloud.storage.Client.assert_called_with(**storage_options)
     mock_client.bucket.assert_called_with("random_bucket")
     mock_bucket.blob.assert_called_with("a.txt")
     mock_blob.download_to_filename.assert_called_with(local_filepath)