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49 lines
1.2 KiB
49 lines
1.2 KiB
package client
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import (
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"time"
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"github.com/pkg/errors"
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)
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// Waiter is informed of current height, decided whether to quit early
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type Waiter func(delta int) (abort error)
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// DefaultWaitStrategy is the standard backoff algorithm,
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// but you can plug in another one
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func DefaultWaitStrategy(delta int) (abort error) {
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if delta > 10 {
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return errors.Errorf("Waiting for %d blocks... aborting", delta)
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} else if delta > 0 {
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// estimate of wait time....
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// wait half a second for the next block (in progress)
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// plus one second for every full block
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delay := time.Duration(delta-1)*time.Second + 500*time.Millisecond
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time.Sleep(delay)
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}
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return nil
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}
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// Wait for height will poll status at reasonable intervals until
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// the block at the given height is available.
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//
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// If waiter is nil, we use DefaultWaitStrategy, but you can also
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// provide your own implementation
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func WaitForHeight(c StatusClient, h int, waiter Waiter) error {
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if waiter == nil {
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waiter = DefaultWaitStrategy
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}
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delta := 1
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for delta > 0 {
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s, err := c.Status()
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if err != nil {
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return err
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}
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delta = h - s.LatestBlockHeight
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// wait for the time, or abort early
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if err := waiter(delta); err != nil {
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return err
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}
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}
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return nil
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}
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