You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
152 lines
4.1 KiB
152 lines
4.1 KiB
package client
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/tendermint/tendermint/libs/log"
|
|
"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 fmt.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(ctx context.Context, c StatusClient, h int64, waiter Waiter) error {
|
|
if waiter == nil {
|
|
waiter = DefaultWaitStrategy
|
|
}
|
|
delta := int64(1)
|
|
for delta > 0 {
|
|
s, err := c.Status(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
delta = h - s.SyncInfo.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, eventValue string, timeout time.Duration) (types.EventData, error) {
|
|
const subscriber = "helpers"
|
|
ctx, cancel := context.WithTimeout(context.Background(), timeout)
|
|
defer cancel()
|
|
|
|
// register for the next event of this type
|
|
eventCh, err := c.Subscribe(ctx, subscriber, types.QueryForEvent(eventValue).String())
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to subscribe: %w", err)
|
|
}
|
|
|
|
// make sure to un-register after the test is over
|
|
defer func() {
|
|
if deferErr := c.UnsubscribeAll(ctx, subscriber); deferErr != nil {
|
|
panic(err)
|
|
}
|
|
}()
|
|
|
|
select {
|
|
case event := <-eventCh:
|
|
return event.Data, nil
|
|
case <-ctx.Done():
|
|
return nil, errors.New("timed out waiting for event")
|
|
}
|
|
}
|
|
|
|
var (
|
|
// ErrClientRunning is returned by Start when the client is already running.
|
|
ErrClientRunning = errors.New("client already running")
|
|
|
|
// ErrClientNotRunning is returned by Stop when the client is not running.
|
|
ErrClientNotRunning = errors.New("client is not running")
|
|
)
|
|
|
|
// RunState is a helper that a client implementation can embed to implement
|
|
// common plumbing for keeping track of run state and logging.
|
|
//
|
|
// TODO(creachadair): This type is a temporary measure, and will be removed.
|
|
// See the discussion on #6971.
|
|
type RunState struct {
|
|
Logger log.Logger
|
|
|
|
mu sync.Mutex
|
|
name string
|
|
isRunning bool
|
|
}
|
|
|
|
// NewRunState returns a new unstarted run state tracker with the given logging
|
|
// label and log sink. If logger == nil, a no-op logger is provided by default.
|
|
func NewRunState(name string, logger log.Logger) *RunState {
|
|
if logger == nil {
|
|
logger = log.NewNopLogger()
|
|
}
|
|
return &RunState{
|
|
name: name,
|
|
Logger: logger,
|
|
}
|
|
}
|
|
|
|
// Start sets the state to running, or reports an error.
|
|
func (r *RunState) Start(context.Context) error {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if r.isRunning {
|
|
r.Logger.Error("not starting client, it is already started", "client", r.name)
|
|
return ErrClientRunning
|
|
}
|
|
r.Logger.Info("starting client", "client", r.name)
|
|
r.isRunning = true
|
|
return nil
|
|
}
|
|
|
|
// Stop sets the state to not running, or reports an error.
|
|
func (r *RunState) Stop() error {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if !r.isRunning {
|
|
r.Logger.Error("not stopping client; it is already stopped", "client", r.name)
|
|
return ErrClientNotRunning
|
|
}
|
|
r.Logger.Info("stopping client", "client", r.name)
|
|
r.isRunning = false
|
|
return nil
|
|
}
|
|
|
|
// IsRunning reports whether the state is running.
|
|
func (r *RunState) IsRunning() bool {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
return r.isRunning
|
|
}
|