// 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"
"html/template"
"math/rand"
"path/filepath"
"github.com/ethereum/go-ethereum/log"
)
// nginxDockerfile is theis the Dockerfile required to build an nginx reverse-
// proxy.
var nginxDockerfile = `FROM jwilder/nginx-proxy`
// nginxComposefile is the docker-compose.yml file required to deploy and maintain
// an nginx reverse-proxy. The proxy is responsible for exposing one or more HTTP
// services running on a single host.
var nginxComposefile = `
version: '2'
services:
nginx:
build: .
image: {{.Network}}/nginx
ports:
- "{{.Port}}:80"
volumes:
- /var/run/docker.sock:/tmp/docker.sock:ro
restart: always
`
// deployNginx deploys a new nginx reverse-proxy container to expose one or more
// HTTP services running on a single host. If an instance with the specified
// network name already exists there, it will be overwritten!
func deployNginx(client *sshClient, network string, port int) ([]byte, error) {
log.Info("Deploying nginx reverse-proxy", "server", client.server, "port", port)
// Generate the content to upload to the server
workdir := fmt.Sprintf("%d", rand.Int63())
files := make(map[string][]byte)
dockerfile := new(bytes.Buffer)
template.Must(template.New("").Parse(nginxDockerfile)).Execute(dockerfile, nil)
files[filepath.Join(workdir, "Dockerfile")] = dockerfile.Bytes()
composefile := new(bytes.Buffer)
template.Must(template.New("").Parse(nginxComposefile)).Execute(composefile, map[string]interface{}{
"Network": network,
"Port": port,
})
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))
}
// nginxInfos is returned from an nginx reverse-proxy status check to allow
// reporting various configuration parameters.
type nginxInfos struct {
port int
}
// String implements the stringer interface.
func (info *nginxInfos) String() string {
return fmt.Sprintf("port=%d", info.port)
}
// checkNginx does a health-check against an nginx reverse-proxy to verify whether
// it's running, and if yes, gathering a collection of useful infos about it.
func checkNginx(client *sshClient, network string) (*nginxInfos, error) {
// Inspect a possible nginx container on the host
infos, err := inspectContainer(client, fmt.Sprintf("%s_nginx_1", network))
if err != nil {
return nil, err
}
if !infos.running {
return nil, ErrServiceOffline
}
// Container available, assemble and return the useful infos
return &nginxInfos{
port: infos.portmap["80/tcp"],
}, nil
}
