144 lines
2.6 KiB
Go
144 lines
2.6 KiB
Go
package router
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import (
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"etrismartfarmpoc/watcher"
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"fmt"
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"log"
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"net/http"
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"sync"
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"github.com/gorilla/mux"
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"github.com/gorilla/websocket"
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)
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var upgrader = websocket.Upgrader{
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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CheckOrigin: func(r *http.Request) bool { return true },
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}
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var notifications []chan *Notification
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var notiMutex sync.Mutex
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func sendNotification(noti *Notification) {
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// notiMutex.Lock()
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// defer notiMutex.Unlock()
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for _, ch := range notifications {
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ch <- noti
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}
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}
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func removeNotification(noti chan *Notification) {
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notiMutex.Lock()
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defer notiMutex.Unlock()
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for i, e := range notifications {
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if e == noti {
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notifications[i] = notifications[len(notifications)-1]
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notifications = notifications[:len(notifications)-1]
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}
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}
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}
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func GetNotification(w http.ResponseWriter, r *http.Request) {
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notiChan := make(chan *Notification, 1)
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notiMutex.Lock()
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notifications = append(notifications, notiChan)
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notiMutex.Unlock()
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte(err.Error()))
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return
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}
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for {
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notification := <-notiChan
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// fmt.Println("Write!!", discoveredDevices)
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if conn.WriteJSON(notification) != nil {
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log.Println(err)
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w.WriteHeader(http.StatusBadRequest)
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removeNotification(notiChan)
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notiChan = nil
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return
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}
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}
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}
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var watchers = map[string]*watcher.DeviceWatcher{}
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func GetDeviceWatch(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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did, ok := vars["id"]
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if !ok {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("not found did"))
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return
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}
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte(err.Error()))
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return
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}
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if !checkDid(did) {
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte("not exist did"))
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return
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}
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s := make(chan map[string]interface{})
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defer close(s)
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ec := make(chan error)
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defer close(ec)
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watch, ok := watchers[did]
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if !ok {
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watch = &watcher.DeviceWatcher{}
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watchers[did] = watch
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}
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watch.Subscribe(s)
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defer func() {
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cnt := watch.Desubscribe(s)
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if cnt == 0 {
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delete(watchers, did)
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log.Println("delete watchers: ", watchers)
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}
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}()
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go func() {
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_, _, err := conn.ReadMessage()
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if err != nil {
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ec <- err
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}
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}()
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for {
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select {
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case param := <-s:
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if conn.WriteJSON(param) != nil {
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log.Println(err)
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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case <-r.Context().Done():
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fmt.Println("see you later~")
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w.WriteHeader(http.StatusOK)
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w.Write([]byte("See you later~"))
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return
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case <-ec:
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return
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}
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}
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}
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func checkDid(did string) bool {
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return true
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}
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