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package client
import (
"time"
"github.com/pkg/errors"
cmn "github.com/tendermint/go-common"
events "github.com/tendermint/go-events"
"github.com/tendermint/tendermint/types"
)
// Waiter is informed of current height, decided whether to quit early
type Waiter func(delta int) (abort error)
// DefaultWaitStrategy is the standard backoff algorithm,
// but you can plug in another one
func DefaultWaitStrategy(delta int) (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 int, waiter Waiter) error {
if waiter == nil {
waiter = DefaultWaitStrategy
}
delta := 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(evsw types.EventSwitch,
evtTyp string, timeout time.Duration) (types.TMEventData, error) {
listener := cmn.RandStr(12)
evts, quit := make(chan events.EventData, 10), make(chan bool, 1)
// start timeout count-down
go func() {
time.Sleep(timeout)
quit <- true
}()
// register for the next event of this type
evsw.AddListenerForEvent(listener, evtTyp, func(data events.EventData) {
evts <- data
})
// make sure to unregister after the test is over
defer evsw.RemoveListenerForEvent(evtTyp, listener)
// defer evsw.RemoveListener(listener) // this also works
select {
case <-quit:
return nil, errors.New("timed out waiting for event")
case evt := <-evts:
tmevt, ok := evt.(types.TMEventData)
if ok {
return tmevt, nil
}
return nil, errors.Errorf("Got unexpected event type: %#v", evt)
}
}