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- // Copyright 2019 The go-ethereum Authors
- // This file is part of go-ethereum.
- //
- // go-ethereum is free software: you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // go-ethereum 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 General Public License for more details.
- //
- // You should have received a copy of the GNU General Public License
- // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
- package main
- import (
- "bytes"
- "encoding/json"
- "fmt"
- "io/ioutil"
- "os"
- "sort"
- "time"
- "github.com/ethereum/go-ethereum/common"
- "github.com/ethereum/go-ethereum/p2p/enode"
- )
- const jsonIndent = " "
- // nodeSet is the nodes.json file format. It holds a set of node records
- // as a JSON object.
- type nodeSet map[enode.ID]nodeJSON
- type nodeJSON struct {
- Seq uint64 `json:"seq"`
- N *enode.Node `json:"record"`
- // The score tracks how many liveness checks were performed. It is incremented by one
- // every time the node passes a check, and halved every time it doesn't.
- Score int `json:"score,omitempty"`
- // These two track the time of last successful contact.
- FirstResponse time.Time `json:"firstResponse,omitempty"`
- LastResponse time.Time `json:"lastResponse,omitempty"`
- // This one tracks the time of our last attempt to contact the node.
- LastCheck time.Time `json:"lastCheck,omitempty"`
- }
- func loadNodesJSON(file string) nodeSet {
- var nodes nodeSet
- if err := common.LoadJSON(file, &nodes); err != nil {
- exit(err)
- }
- return nodes
- }
- func writeNodesJSON(file string, nodes nodeSet) {
- nodesJSON, err := json.MarshalIndent(nodes, "", jsonIndent)
- if err != nil {
- exit(err)
- }
- if file == "-" {
- os.Stdout.Write(nodesJSON)
- return
- }
- if err := ioutil.WriteFile(file, nodesJSON, 0644); err != nil {
- exit(err)
- }
- }
- // nodes returns the node records contained in the set.
- func (ns nodeSet) nodes() []*enode.Node {
- result := make([]*enode.Node, 0, len(ns))
- for _, n := range ns {
- result = append(result, n.N)
- }
- // Sort by ID.
- sort.Slice(result, func(i, j int) bool {
- return bytes.Compare(result[i].ID().Bytes(), result[j].ID().Bytes()) < 0
- })
- return result
- }
- // add ensures the given nodes are present in the set.
- func (ns nodeSet) add(nodes ...*enode.Node) {
- for _, n := range nodes {
- v := ns[n.ID()]
- v.N = n
- v.Seq = n.Seq()
- ns[n.ID()] = v
- }
- }
- // topN returns the top n nodes by score as a new set.
- func (ns nodeSet) topN(n int) nodeSet {
- if n >= len(ns) {
- return ns
- }
- byscore := make([]nodeJSON, 0, len(ns))
- for _, v := range ns {
- byscore = append(byscore, v)
- }
- sort.Slice(byscore, func(i, j int) bool {
- return byscore[i].Score >= byscore[j].Score
- })
- result := make(nodeSet, n)
- for _, v := range byscore[:n] {
- result[v.N.ID()] = v
- }
- return result
- }
- // verify performs integrity checks on the node set.
- func (ns nodeSet) verify() error {
- for id, n := range ns {
- if n.N.ID() != id {
- return fmt.Errorf("invalid node %v: ID does not match ID %v in record", id, n.N.ID())
- }
- if n.N.Seq() != n.Seq {
- return fmt.Errorf("invalid node %v: 'seq' does not match seq %d from record", id, n.N.Seq())
- }
- }
- return nil
- }
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