rate-helpers: Create delaying rate settings

In purrr: Functional Programming Tools

Create delaying rate settings

Description

These helpers create rate settings that you can pass to insistently() and slowly(). You can also use them in your own functions with rate_sleep().

Usage

rate_delay(pause = 1, max_times = Inf)

rate_backoff(
  pause_base = 1,
  pause_cap = 60,
  pause_min = 1,
  max_times = 3,
  jitter = TRUE
)

is_rate(x)

Arguments

pause	Delay between attempts in seconds.
max_times	Maximum number of requests to attempt.
pause_base, pause_cap	rate_backoff() uses an exponential back-off so that each request waits pause_base * 2^i seconds, up to a maximum of pause_cap seconds.
pause_min	Minimum time to wait in the backoff; generally only necessary if you need pauses less than one second (which may not be kind to the server, use with caution!).
jitter	Whether to introduce a random jitter in the waiting time.
x	An object to test.

Examples

# A delay rate waits the same amount of time:
rate <- rate_delay(0.02)
for (i in 1:3) rate_sleep(rate, quiet = FALSE)

# A backoff rate waits exponentially longer each time, with random
# jitter by default:
rate <- rate_backoff(pause_base = 0.2, pause_min = 0.005)
for (i in 1:3) rate_sleep(rate, quiet = FALSE)

purrr documentation built on Aug. 10, 2023, 9:08 a.m.