Add support for starting/stopping/killing a server via the API

http.go

@@ -5,7 +5,10 @@ import (
 	"fmt"
 	"github.com/julienschmidt/httprouter"
 	"github.com/pterodactyl/wings/server"
+	"go.uber.org/zap"
+	"io"
 	"net/http"
+	"os"
 )
 
 type ServerCollection []*server.Server
@@ -57,12 +60,78 @@ func (rt *Router) routeServer(w http.ResponseWriter, _ *http.Request, ps httprou
 	json.NewEncoder(w).Encode(s)
 }
 
+type PowerActionRequest struct {
+	Action string `json:"action"`
+}
+
+func (pr *PowerActionRequest) IsValid() bool {
+	return pr.Action == "start" || pr.Action == "stop" || pr.Action == "kill" || pr.Action == "restart"
+}
+
+// Handles a request to control the power state of a server. If the action being passed
+// through is invalid a 404 is returned. Otherwise, a HTTP/202 Accepted response is returned
+// and the actual power action is run asynchronously so that we don't have to block the
+// request until a potentially slow operation completes.
+//
+// This is done because for the most part the Panel is using websockets to determine when
+// things are happening, so theres no reason to sit and wait for a request to finish. We'll
+// just see over the socket if something isn't working correctly.
+func (rt *Router) routeServerPower(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
+	s := rt.Servers.Get(ps.ByName("server"))
+	defer r.Body.Close()
+
+	dec := json.NewDecoder(r.Body)
+	var action PowerActionRequest
+
+	if err := dec.Decode(&action); err != nil {
+		// Don't flood the logs with error messages if someone sends through bad
+		// JSON data. We don't really care.
+		if err != io.EOF {
+			zap.S().Errorw("failed to decode power action", zap.Error(err))
+		}
+
+		http.Error(w, "could not parse power action from request", http.StatusInternalServerError)
+		return
+	}
+
+	if !action.IsValid() {
+		http.NotFound(w, r)
+		return
+	}
+
+	// Pass the actual heavy processing off to a seperate thread to handle so that
+	// we can immediately return a response from the server.
+	go func(a string, s *server.Server) {
+		switch a {
+		case "start":
+			if err := s.Environment().Start(); err != nil {
+				zap.S().Error(err, zap.String("server", s.Uuid), zap.String("action", "start"))
+			}
+			break
+		case "stop":
+			if err := s.Environment().Stop(); err != nil {
+				zap.S().Error(err, zap.String("server", s.Uuid), zap.String("action", "stop"))
+			}
+			break
+		case "restart":
+			break
+		case "kill":
+			if err := s.Environment().Terminate(os.Kill); err != nil {
+				zap.S().Error(err, zap.String("server", s.Uuid), zap.String("action", "kill"))
+			}
+		}
+	}(action.Action, s)
+
+	w.WriteHeader(http.StatusAccepted)
+}
+
 func (rt *Router) ConfigureRouter() *httprouter.Router {
 	router := httprouter.New()
 
 	router.GET("/", rt.routeIndex)
 	router.GET("/api/servers", rt.routeAllServers)
 	router.GET("/api/servers/:server", rt.AuthenticateServer(rt.routeServer))
+	router.POST("/api/servers/:server/power", rt.AuthenticateServer(rt.routeServerPower))
 
 	return router
-}
+}

server/server.go

@@ -191,6 +191,10 @@ func FromConfiguration(data []byte, cfg DockerConfiguration) (*Server, error) {
 	return s, nil
 }
 
+func (s *Server) Environment() Environment {
+	return s.environment
+}
+
 func (s *Server) Filesystem() *Filesystem {
 	return s.fs
 }