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#' @title Target resources: Amazon Web Services (AWS) S3 storage
#' @export
#' @family resources
#' @description Create the `aws` argument of `tar_resources()`
#' to specify optional settings to AWS for
#' `tar_target(..., repository = "aws")`.
#' See the `format` argument of [tar_target()] for details.
#' @details See the cloud storage section of
#' <https://books.ropensci.org/targets/data.html>
#' for details for instructions.
#' @inheritSection tar_resources Resources
#' @return Object of class `"tar_resources_aws"`, to be supplied
#' to the `aws` argument of `tar_resources()`.
#' @param bucket Character of length 1, name of an existing
#' bucket to upload and download the return values
#' of the affected targets during the pipeline.
#' @param prefix Character of length 1, "directory path"
#' in the bucket where your target object and metadata will go.
#' Please supply an explicit prefix
#' unique to your `targets` project.
#' In the future, `targets` will begin requiring
#' explicitly user-supplied prefixes. (This last note
#' was added on 2023-08-24: `targets` version 1.2.2.9000.)
#' @param region Character of length 1, AWS region containing the S3 bucket.
#' Set to `NULL` to use the default region.
#' @param endpoint Character of length 1, URL endpoint for S3 storage.
#' Defaults to the Amazon AWS endpoint if `NULL`. Example:
#' To use the S3 protocol with Google Cloud Storage,
#' set `endpoint = "https://storage.googleapis.com"`
#' and `region = "auto"`. (A custom endpoint may require that you
#' explicitly set a custom region directly in `tar_resources_aws()`.
#' `region = "auto"` happens to work with Google Cloud.)
#' Also make sure to create
#' HMAC access keys in the Google Cloud Storage console
#' (under Settings => Interoperability) and set the
#' `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` environment
#' variables accordingly. After that, you should be able to use
#' S3 storage formats with Google Cloud storage buckets.
#' There is one limitation, however: even if your bucket has
#' object versioning turned on, `targets` may fail to record object
#' versions. Google Cloud Storage in particular has this
#' incompatibility.
#' @param s3_force_path_style Logical of length 1, whether to use path-style
#' addressing for S3 requests.
#' @param part_size Positive numeric of length 1, number of bytes
#' for each part of a multipart upload. (Except the last part,
#' which is the remainder.) In a multipart upload, each part
#' must be at least 5 MB. The default value of the `part_size`
#' argument is `5 * (2 ^ 20)`.
#' @param page_size Positive integer of length 1, number of items in each
#' page for paginated HTTP requests such as listing objects.
#' @param max_tries Positive integer of length 1, maximum number of attempts
#' to access a network resource on AWS.
#' @param seconds_timeout Positive numeric of length 1,
#' number of seconds until an HTTP connection times out.
#' @param close_connection Logical of length 1, whether to close HTTP
#' connections immediately.
#' @param verbose Logical of length 1, whether to print console messages
#' when running computationally expensive operations such as listing
#' objects in a large bucket.
#' @param ... Named arguments to functions in `paws.storage::s3()` to manage
#' S3 storage. The documentation of these specific functions
#' is linked from `https://www.paws-r-sdk.com/docs/s3/`.
#' The configurable functions themselves are:
#' * `paws.storage::s3()$head_object()`
#' * `paws.storage::s3()$get_object()`
#' * `paws.storage::s3()$delete_object()`
#' * `paws.storage::s3()$put_object()`
#' * `paws.storage::s3()$create_multipart_upload()`
#' * `paws.storage::s3()$abort_multipart_upload()`
#' * `paws.storage::s3()$complete_multipart_upload()`
#' * `paws.storage::s3()$upload_part()`
#' The named arguments in `...` must not be any of
#' `"bucket"`, `"Bucket"`, `"key"`, `"Key"`,
#' `"prefix"`, `"region"`, `"part_size"`, `"endpoint"`,
#' `"version"`, `"VersionId"`, `"body"`, `"Body"`,
#' `"metadata"`, `"Metadata"`, `"UploadId"`, `"MultipartUpload"`,
#' or `"PartNumber"`.
#' @examples
#' # Somewhere in you target script file (usually _targets.R):
#' if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) { # for CRAN
#' tar_target(
#' name,
#' command(),
#' format = "qs",
#' repository = "aws",
#' resources = tar_resources(
#' aws = tar_resources_aws(bucket = "yourbucketname"),
#' qs = tar_resources_qs(preset = "fast")
#' )
#' )
#' }
tar_resources_aws <- function(
bucket = targets::tar_option_get("resources")$aws$bucket,
prefix = targets::tar_option_get("resources")$aws$prefix,
region = targets::tar_option_get("resources")$aws$region,
endpoint = targets::tar_option_get("resources")$aws$endpoint,
s3_force_path_style = targets::tar_option_get(
"resources"
)$aws$s3_force_path_style,
part_size = targets::tar_option_get("resources")$aws$part_size,
page_size = targets::tar_option_get("resources")$aws$page_size,
max_tries = targets::tar_option_get("resources")$aws$max_tries,
seconds_timeout = targets::tar_option_get("resources")$aws$seconds_timeout,
close_connection = targets::tar_option_get("resources")$aws$close_connection,
verbose = targets::tar_option_get("resources")$aws$verbose,
...
) {
if (is.null(prefix)) {
tar_warn_prefix()
prefix <- path_store_default()
}
prefix <- prefix %|||% path_objects_dir_cloud()
part_size <- part_size %|||% (5 * (2 ^ 20))
page_size <- page_size %|||% 1000L
verbose <- verbose %|||% TRUE
args <- list(...)
default_args <- tar_options$get_resources()$aws$args
for (name in names(default_args)) {
args[[name]] <- args[[name]] %|||% default_args[[name]]
}
out <- resources_aws_init(
bucket = bucket,
prefix = prefix,
region = region,
endpoint = endpoint,
s3_force_path_style = s3_force_path_style,
part_size = part_size,
page_size = page_size,
max_tries = max_tries,
seconds_timeout = seconds_timeout,
close_connection = close_connection,
verbose = verbose,
args = args
)
resources_validate(out)
out
}
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