forked from rollcat/dewm
/
api.go
176 lines (163 loc) · 4.01 KB
/
api.go
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package main
import (
"context"
"encoding/json"
"log"
"net/http"
"strconv"
"time"
"github.com/BurntSushi/xgb/xproto"
"github.com/gorilla/mux"
"nhooyr.io/websocket"
)
type WSClient struct {
ch chan interface{}
}
type APIServer struct {
server *http.Server
wm *WM
clients map[*WSClient]interface{}
}
func jsonResponse(w http.ResponseWriter, r *http.Request, status int, data interface{}) {
log.Printf("%d %s", status, r.URL.Path)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.WriteHeader(status)
e := json.NewEncoder(w)
e.Encode(data)
}
func NewAPIServer(wm *WM, listenAddr string) (as *APIServer) {
router := mux.NewRouter()
server := &http.Server{
Addr: listenAddr,
Handler: router,
ReadTimeout: 1 * time.Second,
WriteTimeout: 1 * time.Second,
MaxHeaderBytes: 1 << 16,
}
router.HandleFunc("/screens/", func(w http.ResponseWriter, r *http.Request) {
jsonResponse(w, r, 200,
map[string]interface{}{
"items": as.wm.attachedScreens,
},
)
}).Methods("GET")
router.HandleFunc("/clients/", func(w http.ResponseWriter, r *http.Request) {
jsonResponse(w, r, 200,
map[string]interface{}{
"items": as.wm.clients,
},
)
}).Methods("GET")
getIdUint := func(r *http.Request) *uint64 {
vars := mux.Vars(r)
id, err := strconv.ParseUint(vars["id"], 10, 32)
if err != nil {
return nil
}
return &id
}
getInt := func(key string, data map[string]interface{}) *int32 {
if value, ok := data[key]; ok {
if f, ok := value.(float64); ok {
u := int32(f)
return &u
}
}
return nil
}
router.HandleFunc("/clients/{id:[0-9]+}", func(w http.ResponseWriter, r *http.Request) {
id := getIdUint(r)
if id == nil {
jsonResponse(w, r, http.StatusNotFound, nil)
return
}
client, ok := as.wm.clients[xproto.Window(*id)]
if !ok {
jsonResponse(w, r, http.StatusNotFound, nil)
return
}
switch r.Method {
case "GET":
break
case "POST":
d := json.NewDecoder(r.Body)
var data map[string]interface{}
err := d.Decode(&data)
if err != nil {
jsonResponse(w, r, http.StatusUnprocessableEntity, nil)
return
}
log.Print("update client ", id, " with ", data)
if fullscreenOn := getInt("FullscreenOn", data); fullscreenOn != nil {
if int(*fullscreenOn) < len(as.wm.attachedScreens) {
screen := &as.wm.attachedScreens[int(*fullscreenOn)]
client.MakeFullscreen(screen)
}
}
if X := getInt("X", data); X != nil {
client.X = int16(*X)
}
if Y := getInt("Y", data); Y != nil {
client.Y = int16(*Y)
}
if W := getInt("W", data); W != nil {
client.W = uint16(*W)
}
if H := getInt("H", data); H != nil {
client.H = uint16(*H)
}
client.Configure()
if focus := getInt("Focus", data); focus != nil && *focus == 1 {
client.Focus()
}
case "DELETE":
if err := client.CloseGracefully(); err != nil {
log.Print(err)
}
jsonResponse(w, r, 200, nil)
return
default:
panic("unreachable")
}
jsonResponse(w, r, 200,
map[string]interface{}{
"item": client,
},
)
}).Methods("GET", "POST", "DELETE")
router.HandleFunc(
"/events/",
makeWSHandler(func(ctx context.Context, c *websocket.Conn) {
client := &WSClient{ch: make(chan interface{}, 10)}
as.clients[client] = nil
defer func() {
// Normally only the writer should ever close the
// channel. However we never terminate the WS
// connection on our own so this seems fair.
close(client.ch)
delete(as.clients, client)
}()
for v := range client.ch {
data, err := json.Marshal(v)
if err != nil {
log.Print(err)
continue
}
c.Write(ctx, websocket.MessageText, data)
}
c.Close(websocket.StatusNormalClosure, "")
}),
)
router.PathPrefix("/").Handler(http.NotFoundHandler())
as = &APIServer{
server: server,
wm: wm,
clients: make(map[*WSClient]interface{}),
}
wm.api = as
return as
}
func (as *APIServer) Start() {
log.Printf("Listening on http://%s", as.server.Addr)
log.Fatal(as.server.ListenAndServe())
}