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|
package main
import (
"context"
"fmt"
"log"
"os"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/mount"
"github.com/docker/docker/client"
)
const (
fixedDockerVersion = "1.38"
)
var (
dockerCtx context.Context
dockerCLI *client.Client
)
func setupContext() {
if dockerCtx == nil {
dockerCtx = context.Background()
}
}
func setupDockerCLI() (err error) {
os.Setenv("DOCKER_API_VERSION", "1.27")
if dockerCLI == nil {
dockerCLI, err = client.NewEnvClient()
}
return err
}
func spawnCompanion(username string, accesscode string) {
log.Println("Spwaning a new companion container")
// setup the context and the docker cli connection
setupContext()
setupDockerCLI()
sessionSalt := generateSessionSalt()
vpnRemoteAddress := "127.0.0.1"
vpnRemotePort := "1193"
log.Println("Generating the container config")
Config := &container.Config{
Image: "circus-companion:latest",
Cmd: []string{fmt.Sprintf("-username %s -accesscode %s -sessionSalt %s -vpnRemoteAddress %s -vpnRemotePort %s", username, accesscode, sessionSalt, vpnRemoteAddress, vpnRemotePort)},
// Container labels used by traefik
Labels: map[string]string{
"traefik.enable": "true",
"traefik.http.routers.companion.entrypoints": "web",
"traefik.http.routers.companion.rule": "Host(`companion.docker.localhost`)",
"traefik.http.services.companion.loadbalancer.server.port": "8080",
},
}
// configure the host
// this mounts the docker socket and the companion seed file into the
// container
HostConfig := &container.HostConfig{
Mounts: []mount.Mount{
{
Type: mount.TypeBind,
Source: "/var/run/docker.sock",
Target: "/var/run/docker.sock",
},
{
Type: mount.TypeBind,
Source: "/etc/companion.json",
Target: "/etc/companion.json",
},
},
}
log.Println("Starting the container")
// create the docker container
resp, err := dockerCLI.ContainerCreate(dockerCtx, Config, HostConfig, nil, "")
if err != nil {
panic(err)
}
log.Println("Container started!")
// id of the created container
containerID := resp.ID
log.Printf("Adding the container (%s) to the circus network", containerID)
// get the circus network id
circusNetworkID := getCircusNetworkID()
log.Printf("circus network ID: %s", circusNetworkID)
// connect the companion container to the circus network
connectContainerToNetwork(containerID, circusNetworkID)
log.Println("Container added to the circus network")
}
func generateSessionSalt() string {
return fmt.Sprintf("%d", time.Now().UnixNano())
}
// listDockerNetworks lists the docker networks
func listDockerNetworks(dockerCtx context.Context, dockerCLI *client.Client) ([]types.NetworkResource, error) {
// list the docker networks
networks, err := dockerCLI.NetworkList(dockerCtx, types.NetworkListOptions{})
if err != nil {
return nil, fmt.Errorln("network list err: ", err)
}
return networks, nil
}
// getDockerNetworkIDFromName returns the docker network ID using the given name
// to find it.
func getDockerNetworkIDFromName(string NetworkNameToFind) (string, error) {
for _, network := range networks {
if network.Name == NetworkNameToFind {
return networkID, nil
}
}
return "", fmt.Errorf("could not find the network id for the network %s: %s", circus, err)
}
// connectContainerToNetwork inserts the container with the given ID into the
// network with the given ID
func connectContainerToNetwork(string containerID, string networkID) {
err = dockerCLI.NetworkConnect(dockerCtx, networkID, containerID, nil)
if err != nil {
log.Printf("Could not connect container %s to network %s: %s", containerID[:10], networkID[:10], err)
}
}
func getCircusNetworkID(dockerCtx context.Context, dockerCLI *client.Client) (string, error) {
networks, err := listDockerNetworks(dockerCtx, dockerCLI)
if err != nil {
return "", err
}
circusNetworkID, err := getDockerNetworkIDFromName("circus")
if err != nil {
return "", err
}
return circusNetworkID, nil
}
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