Azure Storage API Class

An R6 class that extends api_client to provide specialized methods for Azure Data Lake Storage Gen2 (ADLS Gen2) REST API operations.

Details

The base URL is constructed as: https://{storageaccount}.dfs.core.windows.net

Super class

azr::api_client -> api_storage_client

Public fields

.filesystem

The filesystem (container) name

Methods

Public methods

• api_storage_client$new()

• api_storage_client$download_file()

• api_storage_client$get_access_control()

• api_storage_client$list_files()

• api_storage_client$clone()

Inherited methods

• azr::api_client$.build_request()
• azr::api_client$.fetch()
• azr::api_client$.get_token()
• azr::api_client$.resp_body_content()
• azr::api_client$.resp_content()
• azr::api_client$.send_request()

---

Method new()

Create a new Azure Storage API client instance

Usage

api_storage_client$new(
  storageaccount,
  filesystem,
  scopes = ".default",
  chain = NULL,
  tenant_id = NULL,
  ...
)

Arguments

storageaccount

A character string specifying the Azure Storage account name.

filesystem

A character string specifying the filesystem (container) name.

scopes

A character string specifying the OAuth2 scope suffix. Defaults to ".default", which requests all permissions the app has been granted.

chain

A credential_chain instance for authentication. If NULL, a default credential chain will be created using DefaultCredential.

tenant_id

A character string specifying the Azure tenant ID. Passed to DefaultCredential when chain is NULL.

...

Additional arguments passed to the parent api_client constructor.

Returns

A new api_storage_client object

---

Method download_file()

Download a file from the filesystem

Usage

api_storage_client$download_file(path, dest = NULL)

Arguments

path

A character string specifying the file path within the filesystem.

dest

A character string specifying the local destination path. Defaults to a temporary file via tempfile().

Returns

The local path the file was written to (invisibly).

---

Method get_access_control()

Get the access control list (ACL) for a file or directory

Usage

api_storage_client$get_access_control(dataset, upn = FALSE)

Arguments

dataset

A character string specifying the file or directory path within the filesystem.

upn

A logical value. If TRUE, user principal names (UPN) are returned in the x-ms-owner, x-ms-group, and x-ms-acl response headers instead of object IDs. Defaults to FALSE.

Returns

A data.frame with columns group_id and permission, one row per named group entry in the x-ms-acl response header.

---

Method list_files()

List files and directories in a path

Usage

api_storage_client$list_files(path = "", recursive = FALSE, ...)

Arguments

path

A character string specifying the directory path to list. Use empty string or NULL for the root directory. Defaults to "".

recursive

A logical value indicating whether to list files recursively. Defaults to FALSE.

...

Additional query parameters to pass to the API.

Returns

A data.frame (or data.table if available) containing file and directory information with columns such as name, contentLength, lastModified, etc.

---

Method clone()

The objects of this class are cloneable with this method.

Usage

api_storage_client$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

if (FALSE) { # \dontrun{
# Create a storage client
storage <- api_storage_client$new(
  storageaccount = "mystorageaccount",
  filesystem = "mycontainer"
)

# List files in the root directory
files <- storage$list_files()

# List files in a specific path
files <- storage$list_files(path = "data/folder1")

# List files recursively
files <- storage$list_files(path = "data", recursive = TRUE)
} # }