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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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