Add send socket commands function

Pktgen provides a TCP socket connection to allow the user to control
it from a remote console or program [1].

This new method will provide Yardstick the ability to send string
commands to a port in a remote host.

[1] http://pktgen-dpdk.readthedocs.io/en/latest/socket.html

JIRA: YARDSTICK-1186

Change-Id: I9d64ccad662fa3599de65654c5dab02833fcc91d
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/yardstick/common/utils.py b/yardstick/common/utils.py
index 108ee17bc..958ec627c 100644
--- a/yardstick/common/utils.py
+++ b/yardstick/common/utils.py
@@ -492,3 +492,25 @@ def wait_until_true(predicate, timeout=60, sleep=1, exception=None):
         if exception and issubclass(exception, Exception):
             raise exception  # pylint: disable=raising-bad-type
         raise exceptions.WaitTimeout
+
+
+def send_socket_command(host, port, command):
+    """Send a string command to a specific port in a host
+
+    :param host: (str) ip or hostname of the host
+    :param port: (int) port number
+    :param command: (str) command to send
+    :return: 0 if success, error number if error
+    """
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    ret = 0
+    try:
+        err_number = sock.connect_ex((host, int(port)))
+        if err_number != 0:
+            return err_number
+        sock.sendall(six.b(command))
+    except Exception:  # pylint: disable=broad-except
+        ret = 1
+    finally:
+        sock.close()
+    return ret