ovs_pmd_stats: added ovs_pmd_stats plugin.

Added ovs_pmd_stats plugin which communicates with ovs-vswitch using
unix socket and publishes pmd metrics in collectd format.

Change-Id: I4dbdd58cdddfd13fe7df44e01c80212f2d4203fc
Signed-off-by: Roman Korynkevych <romanx.korynkevych@intel.com>

diff --git a/3rd_party/ovs_pmd_stats/ovs_pmd_stats.py b/3rd_party/ovs_pmd_stats/ovs_pmd_stats.py
new file mode 100755 (executable)
index 0000000..fc6045b
--- /dev/null
+++ b/3rd_party/ovs_pmd_stats/ovs_pmd_stats.py
@@ -0,0 +1,109 @@
+#!/usr/bin/env python
+#
+# Copyright(c) 2017 Intel Corporation. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Authors:
+#   Roman Korynkevych <romanx.korynkevych@intel.com>
+
+import socket
+import argparse
+import json
+import logging
+
+HOSTNAME = socket.gethostname()
+PROG_NAME = 'ovs_pmd_stats'
+TYPE = 'counter'
+
+MAIN_THREAD = 'main thread'
+PMD_THREAD = 'pmd thread'
+
+REQUEST_MESSAGE = '{"id":0,"method":"dpif-netdev/pmd-stats-show","params":[]}'
+RESPONSE_MESSAGE_TIMEOUT = 1.0
+
+# Setup arguments
+parser = argparse.ArgumentParser(prog=PROG_NAME)
+parser.add_argument('--socket-pid-file', required=True, help='ovs-vswitchd.pid file location')
+args = parser.parse_args()
+
+try:
+    fp = open(args.socket_pid_file, 'r')
+    pid = fp.readline()
+    fp.close()
+except IOError as e:
+    logging.error('I/O error({}): {}'.format(e.errno, e.strerror))
+    raise SystemExit()
+except:
+    logging.error('Unexpected error:', sys.exc_info()[0])
+    raise SystemExit()
+
+server_address = args.socket_pid_file.replace('.pid', '.{}.ctl'.format(pid.strip()))
+
+# open unix socket to ovs-vswitch
+sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+try:
+    sock.connect(server_address)
+except socket.error as msg:
+    logging.error('Socket address: {} Error: {}'.format(server_address, msg))
+    raise SystemExit()
+
+# set timeout
+sock.settimeout(RESPONSE_MESSAGE_TIMEOUT)
+
+# send request
+sock.sendall(REQUEST_MESSAGE)
+
+# listen for respnse message
+rdata = ''
+while True:
+    try:
+        rdata += sock.recv(4096)
+
+        if rdata.count('{') == rdata.count('}'):
+          break
+    except socket.timeout:
+        logging.error('Response message has not been received in {} sec.'.format(RESPONSE_MESSAGE_TIMEOUT))
+        raise SystemExit()
+    except socket.error as e:
+        logging.error('Error received while reading: {}'.format(e.strerror))
+        raise SystemExit()
+
+# parse the message
+try:
+    s = json.loads(rdata, strict=False)
+except ValueError as e:
+    logging.error('Failed to parse JSON response: {}'.format(e.strerror))
+    raise SystemExit()
+
+# check for key string presence in the string
+if 'result' not in s or 'id' not in s or 'error' not in s:
+    logging.error("One of the keys: ['id'], ['result'], ['error'] is missed in the response")
+    logging.error('Msg: {}'.format(s))
+    raise SystemExit()
+
+array = s['result'].replace('\t', '').splitlines()
+
+# submit metrics in collectd format
+plugin_instance = ''
+for el in array:
+    if MAIN_THREAD in el or PMD_THREAD in el:
+        plugin_instance = el[:-1].replace(' ', '_')
+    else:
+        type_instance = el.split(':')[0].replace(' ', "_")
+        value = el.split(':')[1].split(' ')[0]
+        print('PUTVAL %s/%s-%s/%s-%s N:%s' % (HOSTNAME, PROG_NAME, plugin_instance, TYPE, type_instance, value))
+
+# close socket
+sock.close()
+