Function rotation_window 

pub(crate) fn rotation_window(timestamp_unix_ns: i64, rotate_secs: u64) -> i64

Returns the index of the aligned rotation window holding a timestamp.

Windows start at multiples of rotate_secs since the Unix epoch, so with a five-minute period every file covers :00-:05, :05-:10 and so on. Floor division is used, so timestamps before the epoch get negative indices.

Arguments

• timestamp_unix_ns - Sample time in Unix nanoseconds.
• rotate_secs - Window length in seconds. 0 is treated as 1.

Returns

The number of whole windows between the Unix epoch and the timestamp.

Examples

rotation_window(299_999_999_999, 300) == 0
rotation_window(300_000_000_000, 300) == 1
rotation_window(-1, 300)              == -1