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App.go
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App.go
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package main
import (
"fmt"
"github.com/docker/docker/api/types/events"
"github.com/gorilla/websocket"
"sapphire/docker"
"io/ioutil"
"log"
"net/http"
"time"
)
var Connections = map[int64]*websocket.Conn{}
var DockerData docker.Response
type WSMessage struct {
Action string
Content interface{}
}
func main() {
http.HandleFunc("/ws", wsHandler)
fs := http.FileServer(http.Dir("./public"))
http.Handle("/", fs)
go LoadRefresh()
go CatchEvents()
log.Println("starting server on :8000")
panic(http.ListenAndServe(":8000", nil))
}
func rootHandler(w http.ResponseWriter, r *http.Request) {
content, err := ioutil.ReadFile("index.html")
if err != nil {
fmt.Println("Could not open file.", err)
}
fmt.Fprintf(w, "%s", content)
}
func wsHandler(w http.ResponseWriter, r *http.Request) {
conn, err := websocket.Upgrade(w, r, w.Header(), 1024, 1024)
if err != nil {
http.Error(w, "Could not open websocketHandler connection", http.StatusBadRequest)
}
unixNano := time.Now().UnixNano()
Connections[unixNano] = conn
go wsApp(unixNano, conn)
}
func LoadRefresh() {
for {
DockerData = docker.GetData()
time.Sleep(5 * time.Second)
}
}
func wsApp(index int64, conn *websocket.Conn) {
sendInfo(conn, WSMessage{
Action: "init",
Content: DockerData,
})
}
func sendInfo(conn *websocket.Conn, message interface{}) bool {
if err := conn.WriteJSON(message); err != nil {
return false
}
return true
}
func SendToAll(message interface{}) {
for clientId, conn := range Connections {
if !sendInfo(conn, message) {
delete(Connections, clientId)
}
}
}
func CatchEvents() {
msg, _ := docker.CatchEvents()
for message := range msg {
switch message.Type {
case "service":
HandleService(message)
break
case "network":
HandleNetwork(message)
break
case "container":
HandleContainer(message)
break
}
}
}
func HandleNetwork(message events.Message) {
switch message.Action {
case "create":
SendToAll(WSMessage{
Action: "network.create",
Content: message.Actor.Attributes["name"],
})
break
case "connect":
containerId := message.Actor.Attributes["container"]
serviceName := docker.GetContainerServiceName(containerId)
if serviceName != nil {
SendToAll(WSMessage{
Action: "network.connect",
Content: struct {
Network string
Service string
}{message.Actor.Attributes["name"], *serviceName},
})
}
break
case "destroy":
SendToAll(WSMessage{
Action: "network.destroy",
Content: message.Actor.Attributes["name"],
})
break
}
}
func HandleService(message events.Message) {
switch message.Action {
case "create":
SendToAll(WSMessage{
Action: "service.create",
Content: message.Actor.Attributes["name"],
})
break
case "remove":
SendToAll(WSMessage{
Action: "service.remove",
Content: message.Actor.Attributes["name"],
})
break
}
}
func HandleContainer(message events.Message) {
if message.Action == "start" || message.Action == "stop" {
service := message.Actor.Attributes["com.docker.swarm.service.name"]
node := message.Actor.Attributes["com.docker.swarm.servicenode.id"]
name := message.Actor.Attributes["name"]
SendToAll(WSMessage{
Action: "container." + message.Action,
Content: struct {
Service *string
Container *string
Node *string
}{&service, &name, &node},
})
}
}