Fixes remote attach and exec to signal IdleTracker

 - Fixes issue where remote attach and exec only signaled the IdleTracker
   on errors. Needs to done anytime after connection has been hijacked
 - Fixes trying to send multiple http status codes to client
 - Changes pprof and API server shutdowns to run in parallel
 - Changes shutdown to run in sync.Once block

Signed-off-by: Jhon Honce <jhonce@redhat.com>

1 files changed, 16 insertions, 15 deletions

diff --git a/pkg/api/handlers/compat/exec.go b/pkg/api/handlers/compat/exec.go
index df51293c2..cc5db8efe 100644
--- a/pkg/api/handlers/compat/exec.go
+++ b/pkg/api/handlers/compat/exec.go
@@ -174,25 +174,26 @@ func ExecStartHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	idleTracker := r.Context().Value("idletracker").(*idle.Tracker)
-	hijackChan := make(chan bool, 1)
+	logErr := func(e error) {
+		logrus.Error(errors.Wrapf(e, "error attaching to container %s exec session %s", sessionCtr.ID(), sessionID))
+	}
 
-	if err := sessionCtr.ExecHTTPStartAndAttach(sessionID, r, w, nil, nil, nil, hijackChan); err != nil {
-		hijackComplete := <-hijackChan
+	hijackChan := make(chan bool, 1)
+	err = sessionCtr.ExecHTTPStartAndAttach(sessionID, r, w, nil, nil, nil, hijackChan)
 
-		logrus.Errorf("Error attaching to container %s exec session %s: %v", sessionCtr.ID(), sessionID, err)
+	if <-hijackChan {
+		// If connection was Hijacked, we have to signal it's being closed
+		t := r.Context().Value("idletracker").(*idle.Tracker)
+		defer t.Close()
 
-		if hijackComplete {
-			// We do need to tell the idle tracker that the
-			// connection has been closed, though. We can guarantee
-			// that is true after HTTPAttach exits.
-			idleTracker.Close()
-		} else {
-			// A hijack was not successfully completed. We need to
-			// report the error normally.
-			utils.InternalServerError(w, err)
+		if err != nil {
+			// Cannot report error to client as a 500 as the Upgrade set status to 101
+			logErr(err)
 		}
+	} else {
+		// If the Hijack failed we are going to assume we can still inform client of failure
+		utils.InternalServerError(w, err)
+		logErr(err)
 	}
-
 	logrus.Debugf("Attach for container %s exec session %s completed successfully", sessionCtr.ID(), sessionID)
 }