From f8b2ace37c0ea8ef14f46a4fe35da2f4dddac059 Mon Sep 17 00:00:00 2001
From: Dave Birdsall <dbirdsall@apache.org>
Date: Thu, 5 Nov 2015 21:13:07 +0000
Subject: [PATCH] [TRAFODION-1591] Script to find ports not-in-use

---
 core/sqf/sql/scripts/findPort.py | 106 +++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 core/sqf/sql/scripts/findPort.py

diff --git a/core/sqf/sql/scripts/findPort.py b/core/sqf/sql/scripts/findPort.py
new file mode 100644
index 0000000000..89ff510a7e
--- /dev/null
+++ b/core/sqf/sql/scripts/findPort.py
@@ -0,0 +1,106 @@
+# @@@ START COPYRIGHT @@@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+# @@@ END COPYRIGHT @@@
+#
+#  This script finds ranges of ports suitable for input
+#  to the Trafodion install_local_hadoop script.
+#
+import os
+import sys
+import subprocess 
+import re
+import sets
+import argparse  # requires Python 2.7
+
+
+
+
+# beginning of main
+
+# pseudocode
+#
+# do a "netstat | grep localhost" to obtain raw port-in-use info
+#
+# inUseRanges = empty set
+# for each line
+#    for each occurrance of the string "localhost:nnnnn"
+#       rangeInUse = integer(nnnnn/200) (assume a range of 200 ports is needed)
+#       add rangeInUse to inUseRanges
+#    end for
+# end for
+#
+# for each possible range starting from the smallest in rangeInUse and ending at 48800
+#     if it isn't in the inUseRanges set
+#         print it out as a possible port range to use
+#     end if
+# end for
+  
+
+
+# process command line arguments
+
+parser = argparse.ArgumentParser(
+    description='This script finds possible port ranges to use with install_local_hadoop.')
+
+args = parser.parse_args()  # exits and prints help if args are incorrect
+
+exitCode = 0
+
+# get the set of lines to process ( netstat | grep localhost )
+
+p1 = subprocess.Popen(["netstat"], stdout=subprocess.PIPE)
+p2 = subprocess.Popen(["grep","localhost"], stdin=p1.stdout, stdout=subprocess.PIPE, close_fds=True)
+
+# process the lines, looking for port numbers
+
+pattern = r'localhost:(?P<portNumber>[0-9]{5})'
+matcher = re.compile(pattern)
+
+inUseRanges = sets.Set()
+
+for line in p2.stdout: 
+    result = matcher.findall(line)
+    for occurrance in result:
+        rangeInUse = int(occurrance)/200
+        inUseRanges.add(rangeInUse)
+
+# avoid recommending low ranges; our lowest recommendation
+# will be the first unused range above the lowest in-use range
+
+# avoid ranges in the ephemeral port range 49191-65535 also
+
+print
+
+foundOne = False
+minInUse = min(inUseRanges)
+for r in range(min(inUseRanges)+1,48800/200):
+    if r not in inUseRanges:
+        if not foundOne:
+            print "Port ranges not in use:"
+        foundOne = True
+        print 200*r
+
+if not foundOne:
+    print "All port ranges from " + str(200*minInUse) + " through 48800 are in use."
+    exitCode = 1
+
+print
+
+exit(exitCode)