// Copyright 2017 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 (
"encoding/json"
"os"
"sort"
"strings"
"sync"
"github.com/dexon-foundation/dexon/core"
"github.com/dexon-foundation/dexon/log"
"github.com/olekukonko/tablewriter"
)
// networkStats verifies the status of network components and generates a protip
// configuration set to give users hints on how to do various tasks.
func (w *wizard) networkStats() {
if len(w.servers) == 0 {
log.Info("No remote machines to gather stats from")
return
}
// Clear out some previous configs to refill from current scan
w.conf.ethstats = ""
w.conf.bootnodes = w.conf.bootnodes[:0]
// Iterate over all the specified hosts and check their status
var pend sync.WaitGroup
stats := make(serverStats)
for server, pubkey := range w.conf.Servers {
pend.Add(1)
// Gather the service stats for each server concurrently
go func(server string, pubkey []byte) {
defer pend.Done()
stat := w.gatherStats(server, pubkey, w.servers[server])
// All status checks complete, report and check next server
w.lock.Lock()
defer w.lock.Unlock()
delete(w.services, server)
for service := range stat.services {
w.services[server] = append(w.services[server], service)
}
stats[server] = stat
}(server, pubkey)
}
pend.Wait()
// Print any collected stats and return
stats.render()
}
// gatherStats gathers service statistics for a particular remote server.
func (w *wizard) gatherStats(server string, pubkey []byte, client *sshClient) *serverStat {
// Gather some global stats to feed into the wizard
var (
genesis string
ethstats string
bootnodes []string
)
// Ensure a valid SSH connection to the remote server
logger := log.New("server", server)
logger.Info("Starting remote server health-check")
stat := &serverStat{
services: make(map[string]map[string]string),
}
if client == nil {
conn, err := dial(server, pubkey)
if err != nil {
logger.Error("Failed to establish remote connection", "err", err)
stat.failure = err.Error()
return stat
}
client = conn
}
stat.address = client.address
// Client connected one way or another, run health-checks
logger.Debug("Checking for nginx availability")
if infos, err := checkNginx(client, w.network); err != nil {
if err != ErrServiceUnknown {
stat.services["nginx"] = map[string]string{"offline": err.Error()}
}
} else {
stat.services["nginx"] = infos.Report()
}
logger.Debug("Checking for ethstats availability")
if infos, err := checkEthstats(client, w.network); err != nil {
if err != ErrServiceUnknown {
stat.services["ethstats"] = map[string]string{"offline": err.Error()}
}
} else {
stat.services["ethstats"] = infos.Report()
ethstats = infos.config
}
logger.Debug("Checking for bootnode availability")
if infos, err := checkNode(client, w.network, true); err != nil {
if err != ErrServiceUnknown {
stat.services["bootnode"] = map[string]string{"offline": err.Error()}
}
} else {
stat.services["bootnode"] = infos.Report()
genesis = string(infos.genesis)
bootnodes = append(bootnodes, infos.enode)
}
logger.Debug("Checking for sealnode availability")
if infos, err := checkNode(client, w.network, false); err != nil {
if err != ErrServiceUnknown {
stat.services["sealnode"] = map[string]string{"offline": err.Error()}
}
} else {
stat.services["sealnode"] = infos.Report()
genesis = string(infos.genesis)
}
logger.Debug("Checking for explorer availability")
if infos, err := checkExplorer(client, w.network); err != nil {
if err != ErrServiceUnknown {
stat.services["explorer"] = map[string]string{"offline": err.Error()}
}
} else {
stat.services["explorer"] = infos.Report()
}
logger.Debug("Checking for wallet availability")
if infos, err := checkWallet(client, w.network); err != nil {
if err != ErrServiceUnknown {
stat.services["wallet"] = map[string]string{"offline": err.Error()}
}
} else {
stat.services["wallet"] = infos.Report()
}
logger.Debug("Checking for faucet availability")
if infos, err := checkFaucet(client, w.network); err != nil {
if err != ErrServiceUnknown {
stat.services["faucet"] = map[string]string{"offline": err.Error()}
}
} else {
stat.services["faucet"] = infos.Report()
}
logger.Debug("Checking for dashboard availability")
if infos, err := checkDashboard(client, w.network); err != nil {
if err != ErrServiceUnknown {
stat.services["dashboard"] = map[string]string{"offline": err.Error()}
}
} else {
stat.services["dashboard"] = infos.Report()
}
// Feed and newly discovered information into the wizard
w.lock.Lock()
defer w.lock.Unlock()
if genesis != "" && w.conf.Genesis == nil {
g := new(core.Genesis)
if err := json.Unmarshal([]byte(genesis), g); err != nil {
log.Error("Failed to parse remote genesis", "err", err)
} else {
w.conf.Genesis = g
}
}
if ethstats != "" {
w.conf.ethstats = ethstats
}
w.conf.bootnodes = append(w.conf.bootnodes, bootnodes...)
return stat
}
// serverStat is a collection of service configuration parameters and health
// check reports to print to the user.
type serverStat struct {
address string
failure string
services map[string]map[string]string
}
// serverStats is a collection of server stats for multiple hosts.
type serverStats map[string]*serverStat
// render converts the gathered statistics into a user friendly tabular report
// and prints it to the standard output.
func (stats serverStats) render() {
// Start gathering service statistics and config parameters
table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"Server", "Address", "Service", "Config", "Value"})
table.SetAlignment(tablewriter.ALIGN_LEFT)
table.SetColWidth(40)
// Find the longest lines for all columns for the hacked separator
separator := make([]string, 5)
for server, stat := range stats {
if len(server) > len(separator[0]) {
separator[0] = strings.Repeat("-", len(server))
}
if len(stat.address) > len(separator[1]) {
separator[1] = strings.Repeat("-", len(stat.address))
}
if len(stat.failure) > len(separator[1]) {
separator[1] = strings.Repeat("-", len(stat.failure))
}
for service, configs := range stat.services {
if len(service) > len(separator[2]) {
separator[2] = strings.Repeat("-", len(service))
}
for config, value := range configs {
if len(config) > len(separator[3]) {
separator[3] = strings.Repeat("-", len(config))
}
for _, val := range strings.Split(value, "\n") {
if len(val) > len(separator[4]) {
separator[4] = strings.Repeat("-", len(val))
}
}
}
}
}
// Fill up the server report in alphabetical order
servers := make([]string, 0, len(stats))
for server := range stats {
servers = append(servers, server)
}
sort.Strings(servers)
for i, server := range servers {
// Add a separator between all servers
if i > 0 {
table.Append(separator)
}
// Fill up the service report in alphabetical order
services := make([]string, 0, len(stats[server].services))
for service := range stats[server].services {
services = append(services, service)
}
sort.Strings(services)
if len(services) == 0 {
if stats[server].failure != "" {
table.Append([]string{server, stats[server].failure, "", "", ""})
} else {
table.Append([]string{server, stats[server].address, "", "", ""})
}
}
for j, service := range services {
// Add an empty line between all services
if j > 0 {
table.Append([]string{"", "", "", separator[3], separator[4]})
}
// Fill up the config report in alphabetical order
configs := make([]string, 0, len(stats[server].services[service]))
for service := range stats[server].services[service] {
configs = append(configs, service)
}
sort.Strings(configs)
for k, config := range configs {
for l, value := range strings.Split(stats[server].services[service][config], "\n") {
switch {
case j == 0 && k == 0 && l == 0:
table.Append([]string{server, stats[server].address, service, config, value})
case k == 0 && l == 0:
table.Append([]string{"", "", service, config, value})
case l == 0:
table.Append([]string{"", "", "", config, value})
default:
table.Append([]string{"", "", "", "", value})
}
}
}
}
}
table.Render()
}
