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87 lines
2.2 KiB
87 lines
2.2 KiB
// Copyright 2019 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"sort"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/p2p/enode"
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)
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const jsonIndent = " "
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// nodeSet is the nodes.json file format. It holds a set of node records
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// as a JSON object.
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type nodeSet map[enode.ID]nodeJSON
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type nodeJSON struct {
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Seq uint64 `json:"seq"`
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N *enode.Node `json:"record"`
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}
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func loadNodesJSON(file string) nodeSet {
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var nodes nodeSet
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if err := common.LoadJSON(file, &nodes); err != nil {
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exit(err)
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}
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return nodes
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}
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func writeNodesJSON(file string, nodes nodeSet) {
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nodesJSON, err := json.MarshalIndent(nodes, "", jsonIndent)
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if err != nil {
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exit(err)
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}
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if err := ioutil.WriteFile(file, nodesJSON, 0644); err != nil {
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exit(err)
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}
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}
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func (ns nodeSet) nodes() []*enode.Node {
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result := make([]*enode.Node, 0, len(ns))
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for _, n := range ns {
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result = append(result, n.N)
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}
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// Sort by ID.
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sort.Slice(result, func(i, j int) bool {
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return bytes.Compare(result[i].ID().Bytes(), result[j].ID().Bytes()) < 0
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})
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return result
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}
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func (ns nodeSet) add(nodes ...*enode.Node) {
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for _, n := range nodes {
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ns[n.ID()] = nodeJSON{Seq: n.Seq(), N: n}
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}
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}
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func (ns nodeSet) verify() error {
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for id, n := range ns {
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if n.N.ID() != id {
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return fmt.Errorf("invalid node %v: ID does not match ID %v in record", id, n.N.ID())
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}
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if n.N.Seq() != n.Seq {
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return fmt.Errorf("invalid node %v: 'seq' does not match seq %d from record", id, n.N.Seq())
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}
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}
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return nil
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}
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