Remove GenericController and add tests

pkg/ingress/controller/process/nginx.go

@@ -0,0 +1,71 @@
+package process
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"os/exec"
+	"syscall"
+	"time"
+
+	"github.com/golang/glog"
+	ps "github.com/mitchellh/go-ps"
+	"github.com/ncabatoff/process-exporter/proc"
+)
+
+func IsRespawnIfRequired(err error) bool {
+	exitError, ok := err.(*exec.ExitError)
+	if !ok {
+		return false
+	}
+
+	waitStatus := exitError.Sys().(syscall.WaitStatus)
+	glog.Warningf(`
+-------------------------------------------------------------------------------
+NGINX master process died (%v): %v
+-------------------------------------------------------------------------------
+`, waitStatus.ExitStatus(), err)
+	return true
+}
+
+func WaitUntilPortIsAvailable(port int) {
+	// we wait until the workers are killed
+	for {
+		conn, err := net.DialTimeout("tcp", fmt.Sprintf("0.0.0.0:%v", port), 1*time.Second)
+		if err != nil {
+			break
+		}
+		conn.Close()
+		// kill nginx worker processes
+		fs, err := proc.NewFS("/proc")
+		procs, _ := fs.FS.AllProcs()
+		for _, p := range procs {
+			pn, err := p.Comm()
+			if err != nil {
+				glog.Errorf("unexpected error obtaining process information: %v", err)
+				continue
+			}
+
+			if pn == "nginx" {
+				osp, err := os.FindProcess(p.PID)
+				if err != nil {
+					glog.Errorf("unexpected error obtaining process information: %v", err)
+					continue
+				}
+				osp.Signal(syscall.SIGQUIT)
+			}
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+}
+
+// IsNginxRunning returns true if a process with the name 'nginx' is found
+func IsNginxRunning() bool {
+	processes, _ := ps.Processes()
+	for _, p := range processes {
+		if p.Executable() == "nginx" {
+			return true
+		}
+	}
+	return false
+}