If current rate limit data is not resident, these methods will force a call to "rate_limit_status".
Therefore, any of these methods can throw an error.
rate_remaining
Returns the number of API calls available before the next reset.
rate_reset
Returns the Unix epoch time of the next reset.
rate_limit
Returns the current hourly rate limit.
rate_ratio
Returns remaining API call limit, divided by the time remaining before the next reset, as a ratio of
the total rate limit per hour.
For example, if "rate_limit" is 150, the total rate is 150 API calls per hour. If "rate_remaining"
is 75, and there 1800 seconds (1/2 hour) remaining before the next reset, "rate_ratio" returns 1.0,
because there are exactly enough API calls remaining to maintain he full rate of 150 calls per hour.
If "rate_remaining" is 30 and there are 360 seconds remaining before reset, "rate_ratio" returns 2.0,
because there are enough API calls remaining to maintain twice the full rate of 150 calls per hour.
As a final example, if "rate_remaining" is 15, and there are 7200 seconds remaining before reset,
"rate_ratio" returns 0.5, because there are only enough API calls remaining to maintain half the full
rate of 150 calls per hour.
until_rate($target_ratio)
Returns the number of seconds to wait before making another rate limited API call such that
$target_ratio of the full rate would be available. It always returns a number greater than, or equal
to zero.
Use a target rate of 1.0 in a timeline polling loop to get a steady polling rate, using all the
allocated calls, and adjusted for other API calls as they occur.
Use a target rate < 1.0 to allow a process to make calls as fast as possible but not consume all of
the calls available, too soon. For example, if you have a process building a large social graph, you
may want to allow it make as many calls as possible, with no wait, until 20% of the available rate
remains. Use a value of 0.2 for that purpose.
A target rate > than 1.0 can be used for a process that should only use "extra" available API calls.
This is useful for an application that requires most of it's rate limit for normal operation.