retry: A wrapper around 'try' that retries on failure
In reproducible: Enhance Reproducibility of R Code

retry

R Documentation

A wrapper around `try` that retries on failure

This is useful for functions that are "flaky", such as curl, which may fail for unknown reasons that do not persist.

retry(
  expr,
  envir = parent.frame(),
  retries = 5,
  exponentialDecayBase = 1.3,
  silent = TRUE,
  exprBetween = NULL,
  messageFn = message
)

`expr`	Quoted expression to run, i.e., `quote(...)`
`envir`	The environment in which to evaluate the quoted expression, default to `parent.frame(1)`
`retries`	Numeric. The maximum number of retries.
`exponentialDecayBase`	Numeric > 1.0. The delay between successive retries will be `runif(1, min = 0, max = exponentialDecayBase ^ i - 1)` where `i` is the retry number (i.e., follows `seq_len(retries)`)
`silent`	Logical indicating whether to `try` silently.
`exprBetween`	Another expression that should be run after a failed attempt of the `expr`. This should return a named list, where the names indicate the object names to update in the main expr, and the return value is the new value. (previous versions allowed a non-list return, but where the final line had to be an assignment operator, specifying what object (that is used in `expr`) will be updated prior to running the `expr` again. For backwards compatibility, this still works).
`messageFn`	A function for messaging to console. Defaults to `message`