forked from cerc-io/plugeth
51 lines
1.6 KiB
Go
51 lines
1.6 KiB
Go
|
// Copyright 2023 The go-ethereum Authors
|
||
|
|
// This file is part of the go-ethereum library.
|
||
|
|
//
|
||
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
||
|
|
// the Free Software Foundation, either version 3 of the License, or
|
||
|
|
// (at your option) any later version.
|
||
|
|
//
|
||
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
||
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
// GNU Lesser General Public License for more details.
|
||
|
|
//
|
||
|
|
// You should have received a copy of the GNU Lesser General Public License
|
||
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
package event
|
||
|
|
|
||
|
|
// JoinSubscriptions joins multiple subscriptions to be able to track them as
|
||
|
|
// one entity and collectively cancel them of consume any errors from them.
|
||
|
|
func JoinSubscriptions(subs ...Subscription) Subscription {
|
||
|
|
return NewSubscription(func(unsubbed <-chan struct{}) error {
|
||
|
|
// Unsubscribe all subscriptions before returning
|
||
|
|
defer func() {
|
||
|
|
for _, sub := range subs {
|
||
|
|
sub.Unsubscribe()
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
// Wait for an error on any of the subscriptions and propagate up
|
||
|
|
errc := make(chan error, len(subs))
|
||
|
|
for i := range subs {
|
||
|
|
go func(sub Subscription) {
|
||
|
|
select {
|
||
|
|
case err := <-sub.Err():
|
||
|
|
if err != nil {
|
||
|
|
errc <- err
|
||
|
|
}
|
||
|
|
case <-unsubbed:
|
||
|
|
}
|
||
|
|
}(subs[i])
|
||
|
|
}
|
||
|
|
|
||
|
|
select {
|
||
|
|
case err := <-errc:
|
||
|
|
return err
|
||
|
|
case <-unsubbed:
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|