/
main.go
195 lines (163 loc) · 4.29 KB
/
main.go
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package main
import (
"crypto/rand"
"encoding/json"
"fmt"
"io/ioutil"
"strings"
dc "github.com/samalba/dockerclient"
"net/http"
)
func randString(n int) string {
const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
var bytes = make([]byte, n)
rand.Read(bytes)
for i, b := range bytes {
a := alphanum[b%byte(len(alphanum))]
fmt.Println(a)
bytes[i] = a
}
return string(bytes)
}
func main() {
fmt.Println("Devices runner")
// Init the client
docker, err := dc.NewDockerClient("unix:///var/run/docker.sock", nil)
if err != nil {
panic(err)
}
containers, err := docker.ListContainers(true)
if err != nil {
panic(err)
}
for _, c := range containers {
fmt.Println("container: ", c.Names, " status: ", c.Status)
}
// let's create an API for starting devices
http.HandleFunc("/device", func(w http.ResponseWriter, r *http.Request) { devicesHandler(w, r, docker) })
http.HandleFunc("/device/", func(w http.ResponseWriter, r *http.Request) { deviceHandler(w, r, docker) })
http.ListenAndServe(":8080", nil)
}
func deviceHandler(w http.ResponseWriter, r *http.Request, docker *dc.DockerClient) {
path := r.URL.Path
switch r.Method {
case "DELETE":
fmt.Println("DELETE")
deviceName := path[len("/devices"):]
fmt.Println("deletion of", deviceName, "requested")
err := stopAndDeleteDevice(deviceName, docker)
if err != nil {
fmt.Println("Error deleting the container:", err)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
} else {
w.WriteHeader(http.StatusNoContent)
}
}
}
func devicesHandler(w http.ResponseWriter, r *http.Request, docker *dc.DockerClient) {
path := r.URL.Path
switch r.Method {
case "POST":
fmt.Println("POST")
// request of a new device
var deviceRq struct {
Type string
SN string
Server string
}
defer r.Body.Close()
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err)
}
err = json.Unmarshal(body, &deviceRq)
if err != nil {
w.Write([]byte(err.Error()))
w.WriteHeader(http.StatusBadRequest)
return
}
if deviceRq.SN == "" {
deviceRq.SN = randString(6)
}
fmt.Println("Start the device", deviceRq.Type, "with S/N", deviceRq.SN, "Versus server", deviceRq.Server)
err = startDevice(deviceRq.Type, deviceRq.SN, deviceRq.Server, docker)
if err != nil {
fmt.Println("Error starting the container:", err)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
} else {
w.WriteHeader(http.StatusCreated)
w.Write([]byte(deviceRq.SN))
}
case "GET":
fmt.Println("GET")
devices := listDevices(docker)
body, err := json.Marshal(&devices)
if err != nil {
panic(err)
}
w.Write(body)
case "DELETE":
fmt.Println("DELETE")
deviceName := path[len("/device"):]
fmt.Println("deletion of", deviceName, "requested")
err := stopAndDeleteDevice(deviceName, docker)
if err != nil {
fmt.Println("Error deleting the container:", err)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
} else {
w.WriteHeader(http.StatusNoContent)
}
}
fmt.Println("start device API: ", path)
}
func startDevice(devType string, sn string, server string, docker *dc.DockerClient) error {
// try to start the associated docker container
var cfg dc.ContainerConfig
cfg.Image = "device-" + devType
cfg.Env = []string{"DEVICE_SN=" + sn, "DEVICE_SERVER=" + server}
cfg.Tty = true
cfg.AttachStdout = true
cfg.AttachStdin = false
cfg.AttachStderr = true
id, err := docker.CreateContainer(&cfg, "device"+sn)
if err != nil {
return err
}
var host dc.HostConfig
err = docker.StartContainer(id, &host)
return err
}
func stopAndDeleteDevice(deviceSn string, docker *dc.DockerClient) error {
container := "device" + deviceSn
err := docker.KillContainer(container)
if err != nil {
return err
}
err = docker.RemoveContainer(container)
return nil
}
func listDevices(docker *dc.DockerClient) []string {
containers, err := docker.ListContainers(false)
if err != nil {
panic(err)
}
res := make([]string, 0, 10)
for _, c := range containers {
name := arrayToStr(c.Names)
if strings.HasPrefix(name, "/device") {
// found a device container
res = append(res, name[len("/device"):])
}
}
return res
}
func arrayToStr(src []string) string {
res := ""
for _, s := range src {
res += s
}
return res
}