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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 (
"bytes"
"fmt"
"math/rand"
"path/filepath"
"strings"
"text/template"
"github.com/ethereum/go-ethereum/log"
)
// ethstatsDockerfile is the Dockerfile required to build an ethstats backend
// and associated monitoring site.
var ethstatsDockerfile = `
FROM mhart/alpine-node:latest
RUN \
apk add --update git && \
git clone --depth=1 https://github.com/karalabe/eth-netstats && \
apk del git && rm -rf /var/cache/apk/* && \
\
cd /eth-netstats && npm install && npm install -g grunt-cli && grunt
WORKDIR /eth-netstats
EXPOSE 3000
RUN echo 'module.exports = {trusted: [{{.Trusted}}], banned: []};' > lib/utils/config.js
CMD ["npm", "start"]
`
// ethstatsComposefile is the docker-compose.yml file required to deploy and
// maintain an ethstats monitoring site.
var ethstatsComposefile = `
version: '2'
services:
ethstats:
build: .
image: {{.Network}}/ethstats{{if not .VHost}}
ports:
- "{{.Port}}:3000"{{end}}
environment:
- WS_SECRET={{.Secret}}{{if .VHost}}
- VIRTUAL_HOST={{.VHost}}{{end}}
restart: always
`
// deployEthstats deploys a new ethstats container to a remote machine via SSH,
// docker and docker-compose. If an instance with the specified network name
// already exists there, it will be overwritten!
func deployEthstats(client *sshClient, network string, port int, secret string, vhost string, trusted []string) ([]byte, error) {
// Generate the content to upload to the server
workdir := fmt.Sprintf("%d", rand.Int63())
files := make(map[string][]byte)
for i, address := range trusted {
trusted[i] = fmt.Sprintf("\"%s\"", address)
}
dockerfile := new(bytes.Buffer)
template.Must(template.New("").Parse(ethstatsDockerfile)).Execute(dockerfile, map[string]interface{}{
"Trusted": strings.Join(trusted, ", "),
})
files[filepath.Join(workdir, "Dockerfile")] = dockerfile.Bytes()
composefile := new(bytes.Buffer)
template.Must(template.New("").Parse(ethstatsComposefile)).Execute(composefile, map[string]interface{}{
"Network": network,
"Port": port,
"Secret": secret,
"VHost": vhost,
})
files[filepath.Join(workdir, "docker-compose.yaml")] = composefile.Bytes()
// Upload the deployment files to the remote server (and clean up afterwards)
if out, err := client.Upload(files); err != nil {
return out, err
}
defer client.Run("rm -rf " + workdir)
// Build and deploy the ethstats service
return nil, client.Stream(fmt.Sprintf("cd %s && docker-compose -p %s up -d --build", workdir, network))
}
// ethstatsInfos is returned from an ethstats status check to allow reporting
// various configuration parameters.
type ethstatsInfos struct {
host string
port int
secret string
config string
}
// String implements the stringer interface.
func (info *ethstatsInfos) String() string {
return fmt.Sprintf("host=%s, port=%d, secret=%s", info.host, info.port, info.secret)
}
// checkEthstats does a health-check against an ethstats server to verify whether
// it's running, and if yes, gathering a collection of useful infos about it.
func checkEthstats(client *sshClient, network string) (*ethstatsInfos, error) {
// Inspect a possible ethstats container on the host
infos, err := inspectContainer(client, fmt.Sprintf("%s_ethstats_1", network))
if err != nil {
return nil, err
}
if !infos.running {
return nil, ErrServiceOffline
}
// Resolve the port from the host, or the reverse proxy
port := infos.portmap["3000/tcp"]
if port == 0 {
if proxy, _ := checkNginx(client, network); proxy != nil {
port = proxy.port
}
}
if port == 0 {
return nil, ErrNotExposed
}
// Resolve the host from the reverse-proxy and configure the connection string
host := infos.envvars["VIRTUAL_HOST"]
if host == "" {
host = client.server
}
secret := infos.envvars["WS_SECRET"]
config := fmt.Sprintf("%s@%s", secret, host)
if port != 80 && port != 443 {
config += fmt.Sprintf(":%d", port)
}
// Run a sanity check to see if the port is reachable
if err = checkPort(host, port); err != nil {
log.Warn("Ethstats service seems unreachable", "server", host, "port", port, "err", err)
}
// Container available, assemble and return the useful infos
return ðstatsInfos{
host: host,
port: port,
secret: secret,
config: config,
}, nil
}
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