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funder.go
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funder.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"
"fmt"
"time"
"perun.network/go-perun/channel"
)
// Funder is a multi-ledger funder.
type Funder struct {
funders map[LedgerIDMapKey]channel.Funder
}
// NewFunder creates a new funder.
func NewFunder() *Funder {
return &Funder{
funders: make(map[LedgerIDMapKey]channel.Funder),
}
}
// RegisterFunder registers a funder for a given ledger.
func (f *Funder) RegisterFunder(l LedgerID, lf channel.Funder) {
f.funders[l.MapKey()] = lf
}
// Fund funds a multi-ledger channel. It dispatches funding calls to all
// relevant registered funders. It waits until all participants have funded the
// channel. If any of the funder calls fails, the method returns an error.
func (f *Funder) Fund(ctx context.Context, request channel.FundingReq) error {
// Define funding timeout.
d := time.Duration(request.Params.ChallengeDuration) * time.Second
ctx, cancel := context.WithTimeout(ctx, d)
defer cancel()
ledgers, err := assets(request.State.Assets).LedgerIDs()
if err != nil {
return err
}
n := len(ledgers)
errs := make(chan error, n)
for _, l := range ledgers {
go func(l LedgerID) {
errs <- func() error {
id := l.MapKey()
lf, ok := f.funders[id]
if !ok {
return fmt.Errorf("Funder not found for ledger %v", id)
}
err := lf.Fund(ctx, request)
return err
}()
}(l)
}
for i := 0; i < n; i++ {
err := <-errs
if err != nil {
return err
}
}
return nil
}