forked from hyperledger-labs/go-perun
/
asset.go
81 lines (69 loc) 路 1.88 KB
/
asset.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 (
"fmt"
"perun.network/go-perun/channel"
)
type (
// Asset defines a multi-ledger asset.
Asset interface {
channel.Asset
LedgerID() LedgerID
}
// LedgerIDMapKey is the map key representation of a ledger identifier.
LedgerIDMapKey string
// LedgerID represents a ledger identifier.
LedgerID interface {
MapKey() LedgerIDMapKey
}
assets []channel.Asset
)
// LedgerIDs returns the identifiers of the associated ledgers.
func (a assets) LedgerIDs() ([]LedgerID, error) {
ids := make(map[LedgerIDMapKey]LedgerID)
for _, asset := range a {
ma, ok := asset.(Asset)
if !ok {
return nil, fmt.Errorf("wrong asset type: expected multi.Asset, got %T", a)
}
id := ma.LedgerID()
ids[id.MapKey()] = id
}
idsArray := make([]LedgerID, len(ids))
i := 0
for _, v := range ids {
idsArray[i] = v
i++
}
return idsArray, nil
}
// IsMultiLedgerAssets returns whether the assets are from multiple ledgers.
func IsMultiLedgerAssets(assets []channel.Asset) bool {
hasMulti := false
var id LedgerID
for _, asset := range assets {
multiAsset, ok := asset.(Asset)
switch {
case !ok:
continue
case !hasMulti:
hasMulti = true
id = multiAsset.LedgerID()
case id.MapKey() != multiAsset.LedgerID().MapKey():
return true
}
}
return false
}