stats: added optional CLI arg "port" to specify non-default port

There are cases where default port for prometheus exporter is not
available e.g. when multiple vpp are running on single node.

Type: improvement
Change-Id: I39701486f9dfaf4dc9f08aab56e88126687b507a
Signed-off-by: Fahad Khan <fahadnaeemkhan@gmail.com>

diff --git a/src/vpp/app/vpp_prometheus_export.c b/src/vpp/app/vpp_prometheus_export.c
index 69baeb0..35117c9 100644 (file)
--- a/src/vpp/app/vpp_prometheus_export.c
+++ b/src/vpp/app/vpp_prometheus_export.c
@@ -242,6 +242,9 @@ main (int argc, char **argv)
 {
   unformat_input_t _argv, *a = &_argv;
   u8 *stat_segment_name, *pattern = 0, **patterns = 0;
+  u16 port = SERVER_PORT;
+  char *usage =
+    "%s: usage [socket-name <name>] [port <0 - 65535>] <patterns> ...\n";
   int rv;
 
   /* Allocating 256MB heap */
@@ -255,23 +258,22 @@ main (int argc, char **argv)
     {
       if (unformat (a, "socket-name %s", &stat_segment_name))
        ;
+      else if (unformat (a, "port %d", &port))
+       ;
       else if (unformat (a, "%s", &pattern))
        {
          vec_add1 (patterns, pattern);
        }
       else
        {
-         fformat (stderr,
-                  "%s: usage [socket-name <name>] <patterns> ...\n",
-                  argv[0]);
+         fformat (stderr, usage, argv[0]);
          exit (1);
        }
     }
 
   if (vec_len (patterns) == 0)
     {
-      fformat (stderr,
-              "%s: usage [socket-name <name>] <patterns> ...\n", argv[0]);
+      fformat (stderr, usage, argv[0]);
       exit (1);
     }
 
@@ -283,7 +285,7 @@ main (int argc, char **argv)
       exit (1);
     }
 
-  int fd = start_listen (SERVER_PORT);
+  int fd = start_listen (port);
   if (fd < 0)
     {
       exit (1);