49 lines
848 B
Go
49 lines
848 B
Go
package dht
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/anacrolix/dht/v2/krpc"
|
|
)
|
|
|
|
var TransactionTimeout = errors.New("transaction timed out")
|
|
|
|
// Transaction keeps track of a message exchange between nodes, such as a
|
|
// query message and a response message.
|
|
type Transaction struct {
|
|
onResponse func(krpc.Msg)
|
|
}
|
|
|
|
func (t *Transaction) handleResponse(m krpc.Msg) {
|
|
t.onResponse(m)
|
|
}
|
|
|
|
const defaultMaxQuerySends = 1
|
|
|
|
func transactionSender(
|
|
ctx context.Context,
|
|
send func() error,
|
|
resendDelay func() time.Duration,
|
|
maxSends int,
|
|
) error {
|
|
var delay time.Duration
|
|
sends := 0
|
|
for sends < maxSends {
|
|
select {
|
|
case <-time.After(delay):
|
|
err := send()
|
|
sends++
|
|
if err != nil {
|
|
return fmt.Errorf("send %d: %w", sends, err)
|
|
}
|
|
delay = resendDelay()
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
}
|
|
}
|
|
return nil
|
|
}
|