New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Need function for retrying a request #353
Comments
@craigcitro if you're doing PRs, any interest in doing one for this? |
Here's a first stab at it: #' @inheritParams GET
#' @inheritParams POST
#' @param times Number of times to retry
#' @param pause_base,pause_cap This method uses exponential back-off of with
#' full jitter (\url{}) - this means that each request will randomly wait
#' between 0 and \code{pause_base * 2 ^ attempt} seconds, up to a maximum of
#' \code{pause_cap} seconds.
retry <- function(verb, url = NULL, config = list(), ...,
body = NULL, encode = c("multipart", "form", "json", "raw"),
times = 3, pause_base = 1, pause_cap = 60,
handle = NULL) {
stopifnot(is.numeric(times), length(times) == 1L)
hu <- handle_url(handle, url, ...)
req <- request_build(verb, hu$url, body_config(body, match.arg(encode)), config, ...)
resp <- request_perform(req, hu$handle$handle)
i <- 1
while (i <= .times && http_error(resp)) {
resp <- request_perform(req, hu$handle$handle)
backoff_full_jitter(i, pause_base, pause_cap)
i <- i + 1
}
resp
}
backoff_full_jitter <- function(i, pause_base = 1, pause_cap = 60, quiet = FALSE) {
stopifnot(is.integer(pause_base), length(pause_base) == 1L)
stopifnot(is.integer(pause_cap), length(pause_cap) == 1L)
length <- ceiling(runif(min(pause_cap, pause_base * 2 ^ i)))
if (!quiet) {
message("Retrying in ", length, " seconds")
}
Sys.sleep(length)
} I'm using the technique from https://www.awsarchitectureblog.com/2015/03/backoff.html. @craigcitro do you have any thoughts on the base and cap pauses? |
hadley
added a commit
that referenced
this issue
May 24, 2016
This keeps retrying until a request succeeds (in a server friendly way) Fixes #353
Merged
hadley
added a commit
that referenced
this issue
May 25, 2016
This keeps retrying until a request succeeds (in a server friendly way) Fixes #353
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
The text was updated successfully, but these errors were encountered: