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// Copyright 2019 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 les
import (
"errors"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/enode"
)
type ulc struct {
keys map[string]bool
fraction int
}
// newULC creates and returns an ultra light client instance.
func newULC(servers []string, fraction int) (*ulc, error) {
keys := make(map[string]bool)
for _, id := range servers {
node, err := enode.Parse(enode.ValidSchemes, id)
if err != nil {
log.Warn("Failed to parse trusted server", "id", id, "err", err)
continue
}
keys[node.ID().String()] = true
}
if len(keys) == 0 {
return nil, errors.New("no trusted servers")
}
return &ulc{
keys: keys,
fraction: fraction,
}, nil
}
// trusted return an indicator that whether the specified peer is trusted.
func (u *ulc) trusted(p enode.ID) bool {
return u.keys[p.String()]
}
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