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path: root/cmd/puppeth/wizard_netstats.go
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// 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"
    "fmt"
    "os"
    "strings"

    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/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(tips bool) {
    if len(w.servers) == 0 {
        log.Error("No remote machines to gather stats from")
        return
    }
    protips := new(protips)

    // Iterate over all the specified hosts and check their status
    stats := tablewriter.NewWriter(os.Stdout)
    stats.SetHeader([]string{"Server", "IP", "Status", "Service", "Details"})
    stats.SetColWidth(128)

    for _, server := range w.conf.Servers {
        client := w.servers[server]
        logger := log.New("server", server)
        logger.Info("Starting remote server health-check")

        // If the server is not connected, try to connect again
        if client == nil {
            conn, err := dial(server)
            if err != nil {
                logger.Error("Failed to establish remote connection", "err", err)
                stats.Append([]string{server, "", err.Error(), "", ""})
                continue
            }
            client = conn
        }
        // Client connected one way or another, run health-checks
        services := make(map[string]string)
        logger.Debug("Checking for nginx availability")
        if infos, err := checkNginx(client, w.network); err != nil {
            if err != ErrServiceUnknown {
                services["nginx"] = err.Error()
            }
        } else {
            services["nginx"] = infos.String()
        }
        logger.Debug("Checking for ethstats availability")
        if infos, err := checkEthstats(client, w.network); err != nil {
            if err != ErrServiceUnknown {
                services["ethstats"] = err.Error()
            }
        } else {
            services["ethstats"] = infos.String()
            protips.ethstats = infos.config
        }
        logger.Debug("Checking for bootnode availability")
        if infos, err := checkNode(client, w.network, true); err != nil {
            if err != ErrServiceUnknown {
                services["bootnode"] = err.Error()
            }
        } else {
            services["bootnode"] = infos.String()

            protips.genesis = string(infos.genesis)
            protips.bootFull = append(protips.bootFull, infos.enodeFull)
            if infos.enodeLight != "" {
                protips.bootLight = append(protips.bootLight, infos.enodeLight)
            }
        }
        logger.Debug("Checking for sealnode availability")
        if infos, err := checkNode(client, w.network, false); err != nil {
            if err != ErrServiceUnknown {
                services["sealnode"] = err.Error()
            }
        } else {
            services["sealnode"] = infos.String()
            protips.genesis = string(infos.genesis)
        }
        logger.Debug("Checking for faucet availability")
        if infos, err := checkFaucet(client, w.network); err != nil {
            if err != ErrServiceUnknown {
                services["faucet"] = err.Error()
            }
        } else {
            services["faucet"] = infos.String()
        }
        logger.Debug("Checking for dashboard availability")
        if infos, err := checkDashboard(client, w.network); err != nil {
            if err != ErrServiceUnknown {
                services["dashboard"] = err.Error()
            }
        } else {
            services["dashboard"] = infos.String()
        }
        // All status checks complete, report and check next server
        delete(w.services, server)
        for service := range services {
            w.services[server] = append(w.services[server], service)
        }
        server, address := client.server, client.address
        for service, status := range services {
            stats.Append([]string{server, address, "online", service, status})
            server, address = "", ""
        }
        if len(services) == 0 {
            stats.Append([]string{server, address, "online", "", ""})
        }
    }
    // If a genesis block was found, load it into our configs
    if protips.genesis != "" {
        genesis := new(core.Genesis)
        if err := json.Unmarshal([]byte(protips.genesis), genesis); err != nil {
            log.Error("Failed to parse remote genesis", "err", err)
        } else {
            w.conf.genesis = genesis
            protips.network = genesis.Config.ChainId.Int64()
        }
    }
    if protips.ethstats != "" {
        w.conf.ethstats = protips.ethstats
    }
    w.conf.bootFull = protips.bootFull
    w.conf.bootLight = protips.bootLight

    // Print any collected stats and return
    if !tips {
        stats.Render()
    } else {
        protips.print(w.network)
    }
}

// protips contains a collection of network infos to report pro-tips
// based on.
type protips struct {
    genesis   string
    network   int64
    bootFull  []string
    bootLight []string
    ethstats  string
}

// print analyzes the network information available and prints a collection of
// pro tips for the user's consideration.
func (p *protips) print(network string) {
    // If a known genesis block is available, display it and prepend an init command
    fullinit, lightinit := "", ""
    if p.genesis != "" {
        fullinit = fmt.Sprintf("geth --datadir=$HOME/.%s init %s.json && ", network, network)
        lightinit = fmt.Sprintf("geth --datadir=$HOME/.%s --light init %s.json && ", network, network)
    }
    // If an ethstats server is available, add the ethstats flag
    statsflag := ""
    if p.ethstats != "" {
        if strings.Contains(p.ethstats, " ") {
            statsflag = fmt.Sprintf(` --ethstats="yournode:%s"`, p.ethstats)
        } else {
            statsflag = fmt.Sprintf(` --ethstats=yournode:%s`, p.ethstats)
        }
    }
    // If bootnodes have been specified, add the bootnode flag
    bootflagFull := ""
    if len(p.bootFull) > 0 {
        bootflagFull = fmt.Sprintf(` --bootnodes %s`, strings.Join(p.bootFull, ","))
    }
    bootflagLight := ""
    if len(p.bootLight) > 0 {
        bootflagLight = fmt.Sprintf(` --bootnodes %s`, strings.Join(p.bootLight, ","))
    }
    // Assemble all the known pro-tips
    var tasks, tips []string

    tasks = append(tasks, "Run an archive node with historical data")
    tips = append(tips, fmt.Sprintf("%sgeth --networkid=%d --datadir=$HOME/.%s --cache=1024%s%s", fullinit, p.network, network, statsflag, bootflagFull))

    tasks = append(tasks, "Run a full node with recent data only")
    tips = append(tips, fmt.Sprintf("%sgeth --networkid=%d --datadir=$HOME/.%s --cache=512 --fast%s%s", fullinit, p.network, network, statsflag, bootflagFull))

    tasks = append(tasks, "Run a light node with on demand retrievals")
    tips = append(tips, fmt.Sprintf("%sgeth --networkid=%d --datadir=$HOME/.%s --light%s%s", lightinit, p.network, network, statsflag, bootflagLight))

    tasks = append(tasks, "Run an embedded node with constrained memory")
    tips = append(tips, fmt.Sprintf("%sgeth --networkid=%d --datadir=$HOME/.%s --cache=32 --light%s%s", lightinit, p.network, network, statsflag, bootflagLight))

    // If the tips are short, display in a table
    short := true
    for _, tip := range tips {
        if len(tip) > 100 {
            short = false
            break
        }
    }
    fmt.Println()
    if short {
        howto := tablewriter.NewWriter(os.Stdout)
        howto.SetHeader([]string{"Fun tasks for you", "Tips on how to"})
        howto.SetColWidth(100)

        for i := 0; i < len(tasks); i++ {
            howto.Append([]string{tasks[i], tips[i]})
        }
        howto.Render()
        return
    }
    // Meh, tips got ugly, split into many lines
    for i := 0; i < len(tasks); i++ {
        fmt.Println(tasks[i])
        fmt.Println(strings.Repeat("-", len(tasks[i])))
        fmt.Println(tips[i])
        fmt.Println()
        fmt.Println()
    }
}