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server.go
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server.go
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package server
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"sync"
"github.com/gorilla/mux"
"github.com/gorilla/websocket"
"github.com/windmilleng/tilt/pkg/assets"
"github.com/windmilleng/tilt/pkg/model"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
type SailServer struct {
router *mux.Router
rooms map[model.RoomID]*Room
mu *sync.Mutex
assetServer assets.Server
}
func ProvideSailServer(assetServer assets.Server) SailServer {
r := mux.NewRouter().UseEncodedPath()
s := SailServer{
router: r,
rooms: make(map[model.RoomID]*Room, 0),
mu: &sync.Mutex{},
assetServer: assetServer,
}
// Endpoints for the owner of the room.
//
// /room currently expects only POST requests, in future this endpt.
// might do things other than create a new room
r.HandleFunc("/room", s.newRoom)
r.HandleFunc("/share", s.connectRoom)
// Endpoints for following a room.
r.HandleFunc("/join/{roomID}", s.joinRoom)
r.HandleFunc("/view/{roomID}", s.viewRoom)
// All K8s servers should server a 200 on /, so
// that load balancers can do health checking.
r.HandleFunc("/", s.index)
r.PathPrefix("/").Handler(assetServer)
return s
}
func (s SailServer) Router() http.Handler {
return s.router
}
func (s SailServer) newRoom(w http.ResponseWriter, req *http.Request) {
s.mu.Lock()
defer s.mu.Unlock()
if req.Method != http.MethodPost {
http.Error(w, "must be POST request", http.StatusBadRequest)
return
}
var newRoomReq model.SailNewRoomRequest
err := json.NewDecoder(req.Body).Decode(&newRoomReq)
if err != nil {
http.Error(w, fmt.Sprintf("json-decoding request body: %v", err), http.StatusBadRequest)
return
}
room := NewRoom(newRoomReq.WebVersion)
s.rooms[room.id] = room
resp, err := room.newRoomResponse()
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
_, _ = w.Write([]byte(fmt.Sprintf("error creating newRoom response: %v", err)))
}
_, _ = w.Write(resp)
log.Printf("newRoom: %s", room.id)
}
func (s SailServer) hasRoom(roomID model.RoomID) bool {
s.mu.Lock()
defer s.mu.Unlock()
_, ok := s.rooms[roomID]
return ok
}
func (s SailServer) getRoomWithAuth(roomID model.RoomID, secret string) (*Room, error) {
s.mu.Lock()
defer s.mu.Unlock()
room, ok := s.rooms[roomID]
if !ok {
return nil, fmt.Errorf("getRoomWithAuth: no room found with ID: %s", roomID)
}
if room.secret != secret {
return nil, fmt.Errorf("getRoomWithAuth: incorrect secret for room %s", roomID)
}
return room, nil
}
func (s SailServer) closeRoom(room *Room) {
s.mu.Lock()
defer s.mu.Unlock()
log.Printf("closeRoom: %s", room.id)
delete(s.rooms, room.id)
room.Close()
}
func (s SailServer) connectRoom(w http.ResponseWriter, req *http.Request) {
conn, err := upgrader.Upgrade(w, req, nil)
if err != nil {
log.Printf("connectRoom: %v", err)
return
}
roomID := req.URL.Query().Get(model.SailRoomIDKey)
secret := req.Header.Get(model.SailSecretKey)
room, err := s.getRoomWithAuth(model.RoomID(roomID), secret)
if err != nil {
log.Printf("connectRoom: %v", err)
w.WriteHeader(http.StatusForbidden) // TODO(maia): send 404 instead if room not found
_, _ = w.Write([]byte(fmt.Sprintf("error connecting to room %s: %v", roomID, err)))
return
}
room.source = conn
err = room.ConsumeSource(req.Context())
if err != nil {
log.Printf("websocket closed: %v", err)
}
s.closeRoom(room)
}
func (s SailServer) addFanToRoom(ctx context.Context, roomID model.RoomID, conn *websocket.Conn) error {
s.mu.Lock()
defer s.mu.Unlock()
room, ok := s.rooms[roomID]
if !ok {
return fmt.Errorf("Room not found: %s", roomID)
}
log.Printf("addFanToRoom: %s", room.id)
room.AddFan(ctx, conn)
return nil
}
func (s SailServer) joinRoom(w http.ResponseWriter, req *http.Request) {
vars := mux.Vars(req)
roomID := model.RoomID(vars["roomID"])
conn, err := upgrader.Upgrade(w, req, nil)
if err != nil {
http.Error(w, fmt.Sprintf("Error upgrading websocket: %v", err), http.StatusInternalServerError)
return
}
err = s.addFanToRoom(req.Context(), roomID, conn)
if err != nil {
log.Printf("Room add error: %v", err)
return
}
}
func (s SailServer) viewRoom(w http.ResponseWriter, req *http.Request) {
vars := mux.Vars(req)
roomID := model.RoomID(vars["roomID"])
room, ok := s.rooms[roomID]
if !ok {
http.Error(w, fmt.Sprintf("Room not found: %q", roomID), http.StatusNotFound)
return
}
u := req.URL
u.Path = "/index.html"
// Request the correct version of assets
q := u.Query()
q.Set(assets.WebVersionKey, string(room.version))
u.RawQuery = q.Encode()
s.assetServer.ServeHTTP(w, req)
}
func (s SailServer) index(w http.ResponseWriter, req *http.Request) {
_, _ = w.Write([]byte("OK / Sail"))
}