128 lines
3.3 KiB
Go
128 lines
3.3 KiB
Go
// 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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"os"
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"sort"
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"time"
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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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// The score tracks how many liveness checks were performed. It is incremented by one
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// every time the node passes a check, and halved every time it doesn't.
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Score int `json:"score,omitempty"`
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// These two track the time of last successful contact.
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FirstResponse time.Time `json:"firstResponse,omitempty"`
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LastResponse time.Time `json:"lastResponse,omitempty"`
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// This one tracks the time of our last attempt to contact the node.
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LastCheck time.Time `json:"lastCheck,omitempty"`
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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 file == "-" {
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os.Stdout.Write(nodesJSON)
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return
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}
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if err := os.WriteFile(file, nodesJSON, 0644); err != nil {
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exit(err)
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}
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}
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// nodes returns the node records contained in the set.
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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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// add ensures the given nodes are present in the set.
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func (ns nodeSet) add(nodes ...*enode.Node) {
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for _, n := range nodes {
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v := ns[n.ID()]
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v.N = n
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v.Seq = n.Seq()
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ns[n.ID()] = v
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}
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}
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// topN returns the top n nodes by score as a new set.
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func (ns nodeSet) topN(n int) nodeSet {
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if n >= len(ns) {
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return ns
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}
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byscore := make([]nodeJSON, 0, len(ns))
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for _, v := range ns {
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byscore = append(byscore, v)
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}
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sort.Slice(byscore, func(i, j int) bool {
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return byscore[i].Score >= byscore[j].Score
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})
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result := make(nodeSet, n)
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for _, v := range byscore[:n] {
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result[v.N.ID()] = v
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}
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return result
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}
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// verify performs integrity checks on the node set.
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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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