Writing message to our logs when system panics and recovers (#6458)

app/server.go

@@ -13,13 +13,14 @@ import (
 	l4g "github.com/alecthomas/log4go"
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
-	"github.com/mattermost/platform/model"
-	"github.com/mattermost/platform/store"
-	"github.com/mattermost/platform/utils"
 	"github.com/rsc/letsencrypt"
 	"github.com/tylerb/graceful"
 	"gopkg.in/throttled/throttled.v2"
 	"gopkg.in/throttled/throttled.v2/store/memstore"
+
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/store"
+	"github.com/mattermost/platform/utils"
 )
 
 type Server struct {
@@ -38,6 +39,14 @@ var allowedMethods []string = []string{
 	"DELETE",
 }
 
+type RecoveryLogger struct {
+}
+
+func (rl *RecoveryLogger) Println(i ...interface{}) {
+	l4g.Error("Please check the std error output for the stack trace")
+	l4g.Error(i)
+}
+
 type CorsWrapper struct {
 	router *mux.Router
 }
@@ -158,7 +167,7 @@ func StartServer() {
 		Timeout: TIME_TO_WAIT_FOR_CONNECTIONS_TO_CLOSE_ON_SERVER_SHUTDOWN,
 		Server: &http.Server{
 			Addr:         utils.Cfg.ServiceSettings.ListenAddress,
-			Handler:      handlers.RecoveryHandler(handlers.PrintRecoveryStack(true))(handler),
+			Handler:      handlers.RecoveryHandler(handlers.RecoveryLogger(&RecoveryLogger{}), handlers.PrintRecoveryStack(true))(handler),
 			ReadTimeout:  time.Duration(*utils.Cfg.ServiceSettings.ReadTimeout) * time.Second,
 			WriteTimeout: time.Duration(*utils.Cfg.ServiceSettings.WriteTimeout) * time.Second,
 		},