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115 lines
3.7 KiB
115 lines
3.7 KiB
// Copyright 2017 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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"fmt"
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"html/template"
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"math/rand"
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"path/filepath"
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"strconv"
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"github.com/ethereum/go-ethereum/log"
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)
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// nginxDockerfile is theis the Dockerfile required to build an nginx reverse-
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// proxy.
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var nginxDockerfile = `FROM jwilder/nginx-proxy`
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// nginxComposefile is the docker-compose.yml file required to deploy and maintain
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// an nginx reverse-proxy. The proxy is responsible for exposing one or more HTTP
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// services running on a single host.
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var nginxComposefile = `
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version: '2'
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services:
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nginx:
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build: .
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image: {{.Network}}/nginx
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ports:
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- "{{.Port}}:80"
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volumes:
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- /var/run/docker.sock:/tmp/docker.sock:ro
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logging:
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driver: "json-file"
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options:
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max-size: "1m"
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max-file: "10"
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restart: always
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`
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// deployNginx deploys a new nginx reverse-proxy container to expose one or more
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// HTTP services running on a single host. If an instance with the specified
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// network name already exists there, it will be overwritten!
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func deployNginx(client *sshClient, network string, port int) ([]byte, error) {
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log.Info("Deploying nginx reverse-proxy", "server", client.server, "port", port)
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// Generate the content to upload to the server
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workdir := fmt.Sprintf("%d", rand.Int63())
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files := make(map[string][]byte)
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dockerfile := new(bytes.Buffer)
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template.Must(template.New("").Parse(nginxDockerfile)).Execute(dockerfile, nil)
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files[filepath.Join(workdir, "Dockerfile")] = dockerfile.Bytes()
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composefile := new(bytes.Buffer)
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template.Must(template.New("").Parse(nginxComposefile)).Execute(composefile, map[string]interface{}{
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"Network": network,
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"Port": port,
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})
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files[filepath.Join(workdir, "docker-compose.yaml")] = composefile.Bytes()
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// Upload the deployment files to the remote server (and clean up afterwards)
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if out, err := client.Upload(files); err != nil {
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return out, err
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}
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defer client.Run("rm -rf " + workdir)
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// Build and deploy the ethstats service
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return nil, client.Stream(fmt.Sprintf("cd %s && docker-compose -p %s up -d --build", workdir, network))
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}
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// nginxInfos is returned from an nginx reverse-proxy status check to allow
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// reporting various configuration parameters.
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type nginxInfos struct {
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port int
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}
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// Report converts the typed struct into a plain string->string map, cotnaining
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// most - but not all - fields for reporting to the user.
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func (info *nginxInfos) Report() map[string]string {
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return map[string]string{
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"Shared listener port": strconv.Itoa(info.port),
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}
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}
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// checkNginx does a health-check against an nginx reverse-proxy to verify whether
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// it's running, and if yes, gathering a collection of useful infos about it.
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func checkNginx(client *sshClient, network string) (*nginxInfos, error) {
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// Inspect a possible nginx container on the host
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infos, err := inspectContainer(client, fmt.Sprintf("%s_nginx_1", network))
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if err != nil {
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return nil, err
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}
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if !infos.running {
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return nil, ErrServiceOffline
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}
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// Container available, assemble and return the useful infos
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return &nginxInfos{
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port: infos.portmap["80/tcp"],
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}, nil
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}
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