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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/api/types/network"
"github.com/docker/docker/client"
"github.com/docker/go-connections/nat"
)
const (
fixedDockerVersion = "1.38"
)
var (
dockerCtx context.Context
dockerCLI *client.Client
currentVpnRemptePort = 1194
)
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"
// get the vpnRemoteport and increment it
vpnRemotePort := currentVpnRemptePort
log.Println("vpnRemptePort ", currentVpnRemptePort)
currentVpnRemptePort++
log.Println("Generating the container config")
Config := &container.Config{
Image: "circus-companion:latest",
Cmd: []string{"-username", username, "-accessCode", accesscode, "-sessionSalt", sessionSalt, "-vpnRemoteAddress", vpnRemoteAddress, "-vpnRemotePort", fmt.Sprintf("%d", vpnRemotePort)},
ExposedPorts: nat.PortSet{
"8080/tcp": struct{}{},
},
// Container labels used by traefik
Labels: map[string]string{
"traefik.enable": "true",
fmt.Sprintf("traefik.http.routers.%s.entrypoints", username): "web",
fmt.Sprintf("traefik.http.routers.%s.rule", username): fmt.Sprintf("Host(`%s.docker.localhost`)", username),
fmt.Sprintf("traefik.http.services.%s.loadbalancer.server.port", username): "8080",
"traefik.docker.network": "circus",
},
}
// 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",
},
},
}
circusNetworkID, err := getCircusNetworkID(dockerCtx, dockerCLI)
NetworkingConfig := &network.NetworkingConfig{
EndpointsConfig: map[string]*network.EndpointSettings{
"circus": {
NetworkID: circusNetworkID,
},
},
}
log.Println("Creating the container")
// create the docker container
resp, err := dockerCLI.ContainerCreate(dockerCtx, Config, HostConfig, NetworkingConfig, "")
if err != nil {
panic(err)
}
log.Println("Container created!")
// id of the created container
containerID := resp.ID
// start the docker container
err = dockerCLI.ContainerStart(dockerCtx, containerID, types.ContainerStartOptions{})
if err != nil {
fmt.Println(err)
}
log.Printf("Adding the container (%s) to the circus network", containerID)
// get the circus network id
circusNetworkID, err = getCircusNetworkID(dockerCtx, dockerCLI)
if err != nil {
log.Println("error: could not get CircusNetworkID", err)
}
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")
// Get IP Address of that container
inspectJSON, err := dockerCLI.ContainerInspect(dockerCtx, containerID)
if err != nil {
log.Println("inspectJsonErr: ", err)
}
fmt.Println("---")
fmt.Printf("%#v", inspectJSON.NetworkSettings.Networks)
fmt.Printf("companion IP: %#v", inspectJSON.NetworkSettings.Networks["circus"].IPAddress)
}
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.Errorf("network list err: %s", err)
}
return networks, nil
}
// searchDockerNetworkIDFromName returns the docker network ID using the given name
// to find it.
func searchDockerNetworkIDFromName(networks []types.NetworkResource, NetworkNameToFind string) (string, error) {
for _, network := range networks {
if network.Name == NetworkNameToFind {
return network.ID, nil
}
}
return "", fmt.Errorf("could not find the network id for the network %s: %s", NetworkNameToFind)
}
// connectContainerToNetwork inserts the container with the given ID into the
// network with the given ID
func connectContainerToNetwork(containerID string, networkID string) {
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)
}
log.Println("connectContainerToNetwork err: ", err)
}
func getCircusNetworkID(dockerCtx context.Context, dockerCLI *client.Client) (string, error) {
networks, err := listDockerNetworks(dockerCtx, dockerCLI)
if err != nil {
return "", err
}
circusNetworkID, err := searchDockerNetworkIDFromName(networks, "circus")
if err != nil {
return "", err
}
return circusNetworkID, nil
}
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