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subscription.go
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subscription.go
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// Copyright 2022 - See NOTICE file for copyright holders.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package multi
import (
"context"
"perun.network/go-perun/channel"
)
// Subscribe creates a new multi-ledger AdjudicatorSubscription.
func (a *Adjudicator) Subscribe(ctx context.Context, chID channel.ID) (channel.AdjudicatorSubscription, error) {
asub := &AdjudicatorSubscription{
events: make(chan channel.AdjudicatorEvent),
errors: make(chan error),
subs: []channel.AdjudicatorSubscription{},
done: make(chan struct{}),
}
for _, la := range a.adjudicators {
sub, err := la.Subscribe(ctx, chID)
if err != nil {
asub.Close()
return nil, err
}
asub.subs = append(asub.subs, sub)
go func() {
for {
select {
case asub.events <- sub.Next():
case <-asub.done:
return
}
}
}()
go func() {
asub.errors <- sub.Err()
}()
}
return asub, nil
}
// AdjudicatorSubscription is a multi-ledger adjudicator subscription.
type AdjudicatorSubscription struct {
subs []channel.AdjudicatorSubscription
events chan channel.AdjudicatorEvent
errors chan error
done chan struct{}
}
// Next returns the next event.
func (s *AdjudicatorSubscription) Next() channel.AdjudicatorEvent {
select {
case e := <-s.events:
return e
case <-s.done:
return nil
}
}
// Err blocks until an error occurred and returns it.
func (s *AdjudicatorSubscription) Err() error {
for i := 0; i < len(s.subs); i++ {
err := <-s.errors
if err != nil {
return err
}
}
return nil
}
// Close closes the subscription.
func (s *AdjudicatorSubscription) Close() error {
for _, sub := range s.subs {
sub.Close()
}
close(s.done)
return nil
}