wait

func WithExponentialBackoff ¶

func WithExponentialBackoff(opts Backoff, fn CondFunc) error

WithExponentialBackoff repeatedly invokes the function `fn` with exponentially growing/shrinking delay between the calls, until `fn` reports that it's done, or until it returns an error, or until a specified maximum number of retries. in the latter case a somewhat gRPC-specific Status with `DeadlineExceeded` error is returned.

see Backoff documentation of individual `opts` field definitions.

if opts.Delay is not positive - no delay will be introduced between fn() invocations. otherwise, the delay will be bounded by opts.DelayLimit, if the latter is specified.

if opts.Factor is not positive - the delay introduced will be constant, i.e. effective factor of 1.0. if 0 < opts.Factor < 1, the delay introduced will be shrinking, otherwise it'll be growing.

if opts.DelayLimit is not positive - the delay will be increased/decreased by the specified factor on every step. otherwise, the delay between steps will be modified by the specified factor up/down to the delay limit.

if opts.Retries is not positive - `fn` will not be invoked at all.

func WithRetries ¶

func WithRetries(retries int, delay time.Duration, fn CondFunc) error