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#' Tools for working with lists of responses
#'
#' @description
#' These function provide a basic toolkit for operating with lists of
#' responses and possibly errors, as returned by [req_perform_parallel()],
#' [req_perform_sequential()] and [req_perform_iterative()].
#'
#' * `resps_successes()` returns a list successful responses.
#' * `resps_failures()` returns a list failed responses (i.e. errors).
#' * `resps_requests()` returns the list of requests that corresponds to
#' each request.
#' * `resps_data()` returns all the data in a single vector or data frame.
#' It requires the vctrs package to be installed.
#'
#' @export
#' @param resps A list of responses (possibly including errors).
#' @param resp_data A function that takes a response (`resp`) and
#' returns the data foind inside that response as a vector or data frame.
#' @examples
#' reqs <- list(
#' request(example_url()) |> req_url_path("/ip"),
#' request(example_url()) |> req_url_path("/user-agent"),
#' request(example_url()) |> req_template("/status/:status", status = 404),
#' request("INVALID")
#' )
#' resps <- req_perform_parallel(reqs, on_error = "continue")
#'
#' # find successful responses
#' resps |> resps_successes()
#'
#' # collect all their data
#' resps |> resps_successes() |> resps_data(\(resp) resp_body_json(resp))
#'
#' # find requests corresponding to failure responses
#' resps |> resps_failures() |> resps_requests()
resps_successes <- function(resps) {
resps[resps_ok(resps)]
}
#' @export
#' @rdname resps_successes
resps_failures <- function(resps) {
resps[!resps_ok(resps)]
}
resps_ok <- function(resps) {
vapply(resps, is_response, logical(1))
}
#' @export
#' @rdname resps_successes
resps_requests <- function(resps) {
lapply(resps, function(x) x$request)
}
#' @export
#' @rdname resps_successes
resps_data <- function(resps, resp_data) {
check_installed("vctrs")
check_function2(resp_data, "resp")
vctrs::list_unchop(lapply(resps, resp_data))
}
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