Add OOC check and error on new session creation

handlers/bootstrap.go

@@ -57,6 +57,12 @@ func Register() {
 	corsRouter.HandleFunc("/sessions/{sessionId}/instances/{instanceName}", DeleteInstance).Methods("DELETE")
 	corsRouter.HandleFunc("/sessions/{sessionId}/instances/{instanceName}/exec", Exec).Methods("POST")
 
+	r.HandleFunc("/ooc", func(rw http.ResponseWriter, r *http.Request) {
+		http.ServeFile(rw, r, "./www/ooc.html")
+	}).Methods("GET")
+	r.HandleFunc("/503", func(rw http.ResponseWriter, r *http.Request) {
+		http.ServeFile(rw, r, "./www/503.html")
+	}).Methods("GET")
 	r.HandleFunc("/p/{sessionId}", Home).Methods("GET")
 	r.PathPrefix("/assets").Handler(http.FileServer(http.Dir("./www")))
 	r.HandleFunc("/robots.txt", func(rw http.ResponseWriter, r *http.Request) {

handlers/new_session.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"github.com/play-with-docker/play-with-docker/config"
+	"github.com/play-with-docker/play-with-docker/provisioner"
 	"github.com/play-with-docker/play-with-docker/recaptcha"
 )
 
@@ -46,7 +47,13 @@ func NewSession(rw http.ResponseWriter, req *http.Request) {
 	duration := config.GetDuration(reqDur)
 	s, err := core.SessionNew(duration, stack, stackName, imageName)
 	if err != nil {
+		if provisioner.OutOfCapacity(err) {
+			http.Redirect(rw, req, "/ooc", http.StatusFound)
+			return
+		}
 		log.Println(err)
+		http.Redirect(rw, req, "/500", http.StatusInternalServerError)
+		return
 		//TODO: Return some error code
 	} else {
 		hostname := req.Host