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package client
import (
"context"
"fmt"
"time"
"github.com/pkg/errors"
"github.com/tendermint/tendermint/types"
)
// Waiter is informed of current height, decided whether to quit early
type Waiter func(delta int64) (abort error)
// DefaultWaitStrategy is the standard backoff algorithm,
// but you can plug in another one
func DefaultWaitStrategy(delta int64) (abort error) {
if delta > 10 {
return errors.Errorf("Waiting for %d blocks... aborting", delta)
} else if delta > 0 {
// estimate of wait time....
// wait half a second for the next block (in progress)
// plus one second for every full block
delay := time.Duration(delta-1)*time.Second + 500*time.Millisecond
time.Sleep(delay)
}
return nil
}
// Wait for height will poll status at reasonable intervals until
// the block at the given height is available.
//
// If waiter is nil, we use DefaultWaitStrategy, but you can also
// provide your own implementation
func WaitForHeight(c StatusClient, h int64, waiter Waiter) error {
if waiter == nil {
waiter = DefaultWaitStrategy
}
delta := int64(1)
for delta > 0 {
s, err := c.Status()
if err != nil {
return err
}
delta = h - s.LatestBlockHeight
// wait for the time, or abort early
if err := waiter(delta); err != nil {
return err
}
}
return nil
}
// WaitForOneEvent subscribes to a websocket event for the given
// event time and returns upon receiving it one time, or
// when the timeout duration has expired.
//
// This handles subscribing and unsubscribing under the hood
func WaitForOneEvent(c EventsClient, evtTyp string, timeout time.Duration) (types.TMEventData, error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
evts := make(chan interface{}, 1)
// register for the next event of this type
query := fmt.Sprintf("%s='%s'", types.EventTypeKey, evtTyp)
err := c.Subscribe(ctx, query, evts)
if err != nil {
return types.TMEventData{}, errors.Wrap(err, "failed to subscribe")
}
// make sure to unregister after the test is over
defer c.Unsubscribe(ctx, query)
select {
case evt := <-evts:
return evt.(types.TMEventData), nil
case <-ctx.Done():
return types.TMEventData{}, errors.New("timed out waiting for event")
}
}