Package 'Ropendal'

Byte store adapter

Description

A small key-to-bytes adapter over an OpendalFs prefix. It is intended as a substrate for Zarr-like chunk layouts and other index-driven readers that want store-relative keys without leaving Ropendal's byte-first filesystem API.

Usage

byte_store(fs, prefix = "")

store_cache(
  store,
  cache_dir = tools::R_user_dir("Ropendal", "cache"),
  validate = c("last_modified_size", "none")
)

store_block_cache(
  store,
  cache_dir = tools::R_user_dir("Ropendal", "cache"),
  block_size = 8 * 1024^2,
  validate = c("last_modified_size", "none")
)

store_cache_clear(store)

store_read(
  store,
  key,
  mode = c("bytes", "raw"),
  offset = NULL,
  size = NULL,
  end = NULL,
  result = c("auto", "flat", "nested"),
  batch_concurrency = NULL,
  read_concurrency = NULL,
  chunk_size = NULL,
  coalesce_gap = NULL
)

store_read_aio(
  store,
  key,
  mode = c("bytes", "raw"),
  offset = NULL,
  size = NULL,
  end = NULL,
  result = c("auto", "flat", "nested"),
  batch_concurrency = NULL,
  read_concurrency = NULL,
  chunk_size = NULL,
  coalesce_gap = NULL
)

store_write(
  store,
  key,
  data,
  batch_concurrency = NULL,
  write_concurrency = NULL,
  chunk_size = NULL
)

store_write_aio(
  store,
  key,
  data,
  batch_concurrency = NULL,
  write_concurrency = NULL,
  chunk_size = NULL
)

store_replace(
  store,
  key,
  data,
  batch_concurrency = NULL,
  write_concurrency = NULL,
  chunk_size = NULL
)

store_replace_aio(
  store,
  key,
  data,
  batch_concurrency = NULL,
  write_concurrency = NULL,
  chunk_size = NULL
)

store_exists(store, key, batch_concurrency = NULL)

store_exists_aio(store, key, batch_concurrency = NULL)

store_list(
  store,
  path = "",
  recursive = FALSE,
  limit = NULL,
  start_after = NULL
)

store_list_aio(
  store,
  path = "",
  recursive = FALSE,
  limit = NULL,
  start_after = NULL
)

store_delete(store, key, recursive = FALSE, batch_concurrency = NULL)

store_delete_aio(store, key, recursive = FALSE, batch_concurrency = NULL)

Arguments

fs	Ropendal filesystem handle.
prefix	Root-relative filesystem prefix used as the store root.
store	Byte store object returned by byte_store(), store_cache(), or store_block_cache().
cache_dir	Local directory used by store_cache() or store_block_cache().
validate	Cache validation strategy. "last_modified_size" compares parent object size and modification time before using a cached value. "none" skips modification-time checks; block caches still stat the parent to bound ranges and refresh when cached block metadata has a different object size.
block_size	Fixed block size in bytes for store_block_cache().
key	Store-relative object key or keys.
mode	Read materialization: OpendalBytes handles or raw vectors.
offset, size, end	Optional byte-range controls forwarded to the read operation.
result	Requested read result shape.
batch_concurrency	Optional maximum number of keys to process concurrently.
read_concurrency, write_concurrency	Optional per-object OpenDAL transfer concurrency.
chunk_size	Optional transfer chunk size in bytes.
coalesce_gap	Optional byte gap for coalescing nearby read ranges.
data	Raw vector, OpendalBytes, or list of raw vectors/byte handles.
path	Store-relative directory path for store_list().
recursive	Whether to list or delete recursively.
limit	Optional maximum listing entries.
start_after	Optional store-relative listing continuation marker.

Details

store_read() returns OpendalBytes by default so callers can stay below ordinary R raw-vector materialization. mode = "raw" or as.raw() exposes the raw-vector API; for OpendalBytes, as.raw() returns a raw ALTREP facade that materializes only when R requires raw-vector pointer access. The store layer is intentionally byte-only: serializers, deserializers, codecs, and format parsers belong above it.

store_cache() wraps a byte store in an explicit local full-object cache. It is useful for chunked layouts where each key is already a small block. Partial byte-range reads and non-default read shaping bypass this first cache layer. store_block_cache() wraps a byte store in an explicit fixed-size block cache for scalar complete or range reads with result = "auto" while keeping format semantics above the store layer. Vectorized ranges, vectorized keys, and non-auto result shapes bypass this cache adapter and read from the parent store directly.

Value

byte_store(), store_cache(), and store_block_cache() return byte-store objects. Store operations return the corresponding filesystem values with paths rewritten relative to the store root for listings.

Examples

root <- tempfile("ropendal-store-")
dir.create(root)
fs <- opendal("fs", root = root)
store <- byte_store(fs, "array.zarr")
store_write(store, "zarr.json", charToRaw("{}"))
as.raw(store_read(store, "zarr.json"))
cached <- store_cache(store, tempfile("ropendal-cache-"), validate = "none")
as.raw(store_read(cached, "zarr.json"))

---

Asynchronous operation handle.

Description

Asynchronous operation handle.

Usage

OpendalAio

Format

An object of class Ropendal::OpendalAio__bundle (inherits from savvy_Ropendal__sealed) of length 0.

---

Explicit credential provider.

Description

Explicit credential provider.

Usage

OpendalCredentialProvider

Format

An object of class Ropendal::OpendalCredentialProvider__bundle (inherits from savvy_Ropendal__sealed) of length 5.

---

Filesystem handle backed by Apache OpenDAL.

Description

Filesystem handle backed by Apache OpenDAL.

Usage

OpendalFs

Format

An object of class Ropendal::OpendalFs__bundle (inherits from savvy_Ropendal__sealed) of length 2.

---

Internal HTTP fixture for tests.

Description

Internal HTTP fixture for tests.

Usage

OpendalHttpFixture

Format

An object of class Ropendal::OpendalHttpFixture__bundle (inherits from savvy_Ropendal__sealed) of length 1.

---

Streaming listing iterator over one prefix.

Description

Streaming listing iterator over one prefix.

Usage

OpendalLsIter

Format

An object of class Ropendal::OpendalLsIter__bundle (inherits from savvy_Ropendal__sealed) of length 0.

---

Chunked read iterator over one object.

Description

Chunked read iterator over one object.

Usage

OpendalReadIter

Format

An object of class Ropendal::OpendalReadIter__bundle (inherits from savvy_Ropendal__sealed) of length 0.

---

Chunked write sink for one object.

Description

Chunked write sink for one object.

Usage

OpendalWriteIter

Format

An object of class Ropendal::OpendalWriteIter__bundle (inherits from savvy_Ropendal__sealed) of length 0.

---

Ropendal filesystem API

Description

Byte-oriented filesystem operations backed by Apache OpenDAL. The current implementation includes local fs, HTTP, S3-compatible, and Google Drive handles; raw byte operations; metadata and listing where supported; error values; Aio handles for read, write, metadata, and namespace operations; and a pure C API.

Usage

opendal(scheme = "fs", ..., root = NULL, config = list(), auth = NULL,
        headers = NULL, runtime = runtime_config(), layers = list())
opendal_uri(uri, headers = NULL, runtime = runtime_config(), layers = list())
credentials_s3(access_key_id, secret_access_key,
               session_token = "", region = "", source = "direct")
credentials_gcs(token = "", service_account_key = "",
                credential_path = "", scope = "", source = "direct")
credentials_azblob(account_name = "", account_key = "", sas_token = "",
                   endpoint = "", source = "direct")
credentials_gdrive(access_token = "", refresh_token = "",
                   client_id = "", client_secret = "", source = "direct")
credentials_gdrive3(secret_json,
                    tokens_json = file.path(dirname(secret_json), "tokens.json"),
                    scope = "https://www.googleapis.com/auth/drive")
credential_schemes(provider)
credential_config(provider, service)
credential_summary(provider)
runtime_config(threads = NULL)
layer_concurrent_limit(max)
layer_timeout(request_timeout = NULL, io_timeout = NULL)
fs_info(fs)
fs_capabilities(fs)
fs_normalize_path(fs, path, directory = FALSE)
byte_ranges(path, offset, size = NULL, end = NULL, id = NULL, result = "flat")
opt(fs, name)
opt(fs, name) <- value
serial_config(class, sfunc, ufunc)
codec_config(name, class = "raw", sfunc = NULL, ufunc = NULL)
serialize_raw(x, config = list())
deserialize_raw(x, config = list())
fs_read(fs, path, offset = 0, size = NULL, end = NULL,
        result = c("auto", "flat", "nested"), batch_concurrency = NULL,
        read_concurrency = NULL, chunk_size = NULL, coalesce_gap = NULL,
        mode = c("raw", "serial", "text", "codec"), encoding = "UTF-8",
        serial_config = opt(fs, "serial"), codec = opt(fs, "codec"))
fs_read_aio(fs, path, offset = 0, size = NULL, end = NULL,
            result = c("auto", "flat", "nested"), batch_concurrency = NULL,
            read_concurrency = NULL, chunk_size = NULL, coalesce_gap = NULL,
            mode = c("raw", "serial", "text", "codec"), encoding = "UTF-8",
            serial_config = opt(fs, "serial"), codec = opt(fs, "codec"))
fs_read_bytes(fs, path, offset = 0, size = NULL, end = NULL,
              result = c("auto", "flat", "nested"), batch_concurrency = NULL,
              read_concurrency = NULL, chunk_size = NULL, coalesce_gap = NULL)
fs_read_bytes_aio(fs, path, offset = 0, size = NULL, end = NULL,
                  result = c("auto", "flat", "nested"), batch_concurrency = NULL,
                  read_concurrency = NULL, chunk_size = NULL, coalesce_gap = NULL)
opendal_bytes_slice(x, offset = 0, size = NULL, end = NULL)
## S3 method for class 'OpendalBytes'
as.raw(x)
## S3 method for class 'OpendalBytes'
length(x)
fs_read_iter(fs, path, chunk_size, offset = 0, size = NULL,
             read_concurrency = NULL, coalesce_gap = NULL)
read_iter_next(iter)
read_iter_collect(iter)
fs_tell(iter)
fs_seek(iter, offset, whence = c("start", "current", "end"))
fs_write(fs, path, data, batch_concurrency = NULL,
         write_concurrency = NULL, chunk_size = NULL,
         mode = c("raw", "serial", "text", "codec"), encoding = "UTF-8",
         serial_config = opt(fs, "serial"), codec = opt(fs, "codec"))
fs_write_aio(fs, path, data, batch_concurrency = NULL,
             write_concurrency = NULL, chunk_size = NULL,
             mode = c("raw", "serial", "text", "codec"), encoding = "UTF-8",
             serial_config = opt(fs, "serial"), codec = opt(fs, "codec"))
fs_replace(fs, path, data, batch_concurrency = NULL,
           write_concurrency = NULL, chunk_size = NULL,
           mode = c("raw", "serial", "text", "codec"), encoding = "UTF-8",
           serial_config = opt(fs, "serial"), codec = opt(fs, "codec"))
fs_replace_aio(fs, path, data, batch_concurrency = NULL,
               write_concurrency = NULL, chunk_size = NULL,
               mode = c("raw", "serial", "text", "codec"), encoding = "UTF-8",
               serial_config = opt(fs, "serial"), codec = opt(fs, "codec"))
fs_append(fs, path, data, batch_concurrency = NULL,
          write_concurrency = NULL, chunk_size = NULL,
          mode = c("raw", "serial", "text", "codec"), encoding = "UTF-8",
          serial_config = opt(fs, "serial"), codec = opt(fs, "codec"))
fs_append_aio(fs, path, data, batch_concurrency = NULL,
              write_concurrency = NULL, chunk_size = NULL,
              mode = c("raw", "serial", "text", "codec"), encoding = "UTF-8",
              serial_config = opt(fs, "serial"), codec = opt(fs, "codec"))
fs_write_iter(fs, path, create = TRUE, append = FALSE,
              write_concurrency = NULL, chunk_size = NULL)
write_iter_write(iter, data)
write_iter_close(iter)
fs_stat(fs, path, batch_concurrency = NULL)
fs_stat_aio(fs, path, batch_concurrency = NULL)
fs_stats(fs, path, batch_concurrency = NULL)
fs_stats_aio(fs, path, batch_concurrency = NULL)
fs_exists(fs, path, batch_concurrency = NULL)
fs_exists_aio(fs, path, batch_concurrency = NULL)
fs_ls(fs, path = "", recursive = FALSE, limit = NULL, start_after = NULL)
fs_ls_aio(fs, path = "", recursive = FALSE,
          limit = NULL, start_after = NULL)
fs_ls_iter(fs, path = "", recursive = FALSE, page_size = 1000,
           limit = NULL, start_after = NULL, prefetch = 0)
fs_walk_iter(fs, path = "", page_size = 1000,
             limit = NULL, start_after = NULL, prefetch = 0)
ls_iter_next(iter)
ls_iter_collect(iter)
walk_iter_next(iter)
walk_iter_collect(iter)
fs_mkdir(fs, path)
fs_mkdir_aio(fs, path, batch_concurrency = NULL)
fs_delete(fs, path, recursive = FALSE, batch_concurrency = NULL)
fs_delete_aio(fs, path, recursive = FALSE, batch_concurrency = NULL)
fs_copy(fs, from, to)
fs_copy_aio(fs, from, to, batch_concurrency = NULL)
fs_rename(fs, from, to)
fs_rename_aio(fs, from, to, batch_concurrency = NULL)
collect_aio(aio)
collect_aio_(aio)
call_aio(aio)
call_aio_(aio)
stop_aio(aio)
poll_aio(aio)
cv()
cv_value(cv)
cv_reset(cv)
cv_signal(cv)
cv_wait(cv, interval = 0.001)
cv_until(cv, msec = 0, interval = 0.001)
aio_monitor(aio, cv = cv())
read_monitor(monitor)
race_aio(aio, timeout = NULL, interval = 0.001)
unresolved(x = NULL)
is_error_value(x)
error_kind(x)
error_message(x)
error_operation(x)
error_path(x)

Arguments

scheme	OpenDAL service scheme.
...	Named service configuration entries.
root	Root path/prefix for the service.
config	For opendal(), named list of service configuration entries. For serialize_raw() / deserialize_raw(), serialization config.
auth	Explicit credential provider.
headers	Named scalar character list/vector of HTTP headers for http/https filesystems; values may contain credentials and are not printed by Ropendal.
runtime	Runtime configuration from runtime_config().
layers	List of explicit filesystem layers, currently including layer_concurrent_limit() and layer_timeout().
threads	Number of Tokio worker threads for a filesystem handle.
max	Maximum total in-flight backend operations for a filesystem handle.
request_timeout	Operation timeout in seconds for non-streaming backend operations such as stat, exists, delete, copy, rename, and mkdir. If only one timeout field is supplied, the omitted field uses OpenDAL's timeout-layer default.
io_timeout	I/O timeout in seconds for backend read/write streams and listing iteration. If only one timeout field is supplied, the omitted field uses OpenDAL's timeout-layer default.
uri	OpenDAL URI.
access_key_id, secret_access_key	S3-compatible access key fields.
session_token	Optional S3-compatible session token.
region	Optional S3-compatible signing region.
token	Google Cloud Storage OAuth2 bearer token.
service_account_key	Google Cloud Storage service-account JSON string.
credential_path	Explicit path to Google Cloud Storage credential JSON.
account_name	Azure Blob Storage account name.
account_key	Azure Blob Storage account key.
sas_token	Azure Blob Storage SAS token.
endpoint	Optional Azure Blob Storage endpoint.
access_token	Google Drive access token, mutually exclusive with refresh_token.
refresh_token	Google Drive refresh token.
client_id, client_secret	OAuth client fields required with refresh_token.
source	Redacted source label for a credential provider.
secret_json	Path to a JSON file containing Google Drive client_id and client_secret.
tokens_json	Path to a token JSON file containing a refresh token.
scope	Scope used to choose a refresh token from tokens_json.
provider	Credential provider object.
service	OpenDAL service scheme for credential materialization.
fs	Ropendal filesystem handle.
path	Root-relative path or paths. For fs_read(), fs_read_aio(), fs_read_bytes(), and fs_read_bytes_aio(), may also be a byte_ranges() request object.
directory	Whether to normalize as a directory path.
offset	Zero-based byte offset or offsets. Omit or use NULL to read each path from byte zero; explicit numeric offsets are not recycled across multiple paths. Use numeric vectors for many ranges from one path and lists of numeric vectors for per-path ranges.
size	Number of bytes to read, or NULL to read to EOF. When supplied, size follows the same scalar/vector/list shape as offset.
end	Exclusive byte end offset. When supplied, end follows the same scalar/vector/list shape as offset.
id	Optional identifiers for ranges in a byte_ranges() request. Flat request results are named with id when lengths match; nested result names require a list-shaped id aligned with per-path ranges.
result	Requested result shape.
name	Option name.
value	Option value.
class	Class name or names matched for custom serialization.
sfunc, ufunc	Serializer and deserializer functions for serial_config(). R-closure codecs are not supported; codec transforms are native byte transforms.
mode	Materialization mode: raw bytes, text strings, serialized R objects, or raw bytes passed through an explicit codec.
encoding	Text encoding for mode = "text" reads and writes. Encodings whose encoded bytes contain NUL bytes are rejected; use raw mode for those storage formats.
serial_config	Serialization config, normally opt(fs, "serial").
codec	Optional native byte codec name or codec_config() object, normally opt(fs, "codec").
batch_concurrency	Optional maximum number of independent paths/ranges to process concurrently. NULL uses the Ropendal default; explicit 0 is invalid in the R API.
read_concurrency	Optional per-object OpenDAL read concurrency for large reads where the backend supports chunked/concurrent reads.
write_concurrency	Optional per-object OpenDAL write concurrency for large writes where the backend supports multipart/concurrent writes.
chunk_size	Optional read/write chunk size in bytes for OpenDAL's per-object transfer planning.
coalesce_gap	Optional byte gap for coalescing nearby read ranges.
data	Raw vector, OpendalBytes handle, or list mixing raw vectors and OpendalBytes handles for multiple paths in raw mode; arbitrary R object or list of objects in serial mode.
iter	Read, write, listing, or walking iterator handle.
whence	Seek origin for read iterators: iterator start, current, or end.
create	Whether a write iterator should create only and fail if the target exists.
append	Whether a write iterator should append rather than replace.
recursive	Whether to recurse for operations that support it.
limit	Optional maximum number of listing entries to materialize or return across an iterator.
start_after	Optional root-relative listing continuation marker; entries less than or equal to this path are skipped where supported. Iterator ⁠$cursor⁠ values are last yielded paths and can be used as best-effort start_after markers for lexically ordered listings; they are not opaque backend continuation tokens.
page_size	Maximum number of entries returned by one iterator page.
prefetch	Number of listing entries an iterator may buffer ahead in Rust/Tokio. Positive values may start bounded background prefetch at iterator construction; use 0 to keep strict demand-driven iteration.
from, to	Source and destination paths.
aio	Aio handle.
cv	Condition variable object from cv().
monitor	Monitor handle from aio_monitor().
msec	Milliseconds to wait for cv_until().
timeout	Optional milliseconds to wait for race_aio().
interval	Poll interval in seconds for R-thread wait helpers.
x	Object to inspect.

Details

Filesystem failures are returned as classed error values. Invalid arguments and internal runtime failures may signal R errors. Credential helpers return classed providers with redacted printing; pass them with ⁠auth =⁠.

Aio handles expose read-only active bindings. ⁠$value⁠ returns an unresolvedValue while the operation is pending and the resolved value or error value afterwards. ⁠$data⁠ and ⁠$result⁠ are aliases for ⁠$value⁠, while ⁠$state⁠, ⁠$resolved⁠, and ⁠$error⁠ expose readiness and error inspection. collect_aio() waits and returns the value. call_aio() waits, updates the Aio, and returns the Aio invisibly. unresolved() constructs the unresolved sentinel; unresolved(aio) and unresolved(value) are predicates.

byte_ranges() builds a small range request object for index-heavy formats. Pass it as the path argument to fs_read(), fs_read_aio(), fs_read_bytes(), or fs_read_bytes_aio(); the object is unpacked into the same vector/list path, offset, size, and end shapes as direct calls. Request objects default to result = "flat", which is convenient for row-oriented index tables.

opendal_bytes_slice() returns another immutable OpendalBytes handle for a byte subrange without first materializing the complete handle as an R raw vector. offset is zero-based and end is exclusive, matching read ranges. as.raw() on an OpendalBytes handle returns a raw ALTREP facade: element and region access copy only requested bytes, while pointer access materializes an R-owned raw vector.

Value

Filesystem handles, raw vectors, OpendalBytes handles, deserialized R objects, metadata lists, logical results, Aio handles, or classed error values depending on the operation and mode.

---