Create a nodeping script for quick ping wrapping

confluent_client/bin/nodeping

@@ -0,0 +1,141 @@
+#!/usr/bin/python2
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2016-2017 Lenovo
+#
+# 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.
+
+from collections import deque
+import optparse
+import os
+import select
+import signal
+import subprocess
+import sys
+
+try:
+    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
+except AttributeError:
+    pass
+path = os.path.dirname(os.path.realpath(__file__))
+path = os.path.realpath(os.path.join(path, '..', 'lib', 'python'))
+if path.startswith('/opt'):
+    sys.path.append(path)
+
+import confluent.client as client
+import confluent.sortutil as sortutil
+
+
+def run():
+
+    argparser = optparse.OptionParser(
+        usage="Usage: %prog [options] noderange")
+    argparser.add_option('-f', '-c', '--count', type='int', default=168,
+                         help='Number of commands to run at a time')
+    argparser.add_option('-s', '--substitutename',
+                         help='Use a different name other than the nodename for ping')
+    # among other things, FD_SETSIZE limits.  Besides, spawning too many
+    # processes can be unkind for the unaware on memory pressure and such...
+    argparser.disable_interspersed_args()
+    (options, args) = argparser.parse_args()
+    if len(args) < 1:
+        argparser.print_help()
+        sys.exit(1)
+    client.check_globbing(args[0])
+    concurrentprocs = options.count
+    c = client.Command()
+
+    currprocs = 0
+    all = set([])
+    pipedesc = {}
+    pendingexecs = deque()
+    exitcode = 0
+
+    nodemap = {}
+    if options.substitutename:
+        subname = options.substitutename
+        if '{' not in subname:
+            subname = '{node}' + subname
+        for exp in c.create('/noderange/{0}/attributes/expression'.format(args[0]),
+                        {'expression': subname}):
+            if 'error' in exp:
+                sys.stderr.write(exp['error'] + '\n')
+                exitcode |= exp.get('errorcode', 1)
+            ex = exp.get('databynode', ())
+            for node in ex:
+                nodemap[node] = ex[node]['value']
+    for rsp in c.read('/noderange/{0}/nodes/'.format(args[0])):
+        if 'error' in rsp:
+            sys.stderr.write(rsp['error'] + '\n')
+            exitcode |= rsp.get('errorcode', 1)
+        if rsp.get('item', {}).get('href', None):
+            node = rsp['item']['href'][:-1]
+            pingnode = nodemap.get(node, node)
+            cmdv = ['ping', '-c', '1', '-W', '1', pingnode]
+            if currprocs < concurrentprocs:
+                currprocs += 1
+                run_cmdv(node, cmdv, all, pipedesc)
+            else:
+                pendingexecs.append((node, cmdv))
+    if not all or exitcode:
+        sys.exit(exitcode)
+    rdy, _, _ = select.select(all, [], [], 10)
+    while all:
+        pernodeout = {}
+        for r in rdy:
+            desc = pipedesc[r]
+            node = desc['node']
+            data = True
+            while data and select.select([r], [], [], 0)[0]:
+                data = r.readline()
+                if not data:
+                    pop = desc['popen']
+                    ret = pop.poll()
+                    if ret is not None:
+                        exitcode = exitcode | ret
+                        all.discard(r)
+                        r.close()
+                        if desc['type'] == 'stdout':
+                            if ret:
+                                print('{0}: no_ping'.format(node))
+                            else:
+                                print('{0}: ping'.format(node))
+                            if pendingexecs:
+                                node, cmdv = pendingexecs.popleft()
+                                run_cmdv(node, cmdv, all, pipedesc)
+        for node in sortutil.natural_sort(pernodeout):
+            for line in pernodeout[node]:
+                line = client.stringify(line)
+                if options.nonodeprefix:
+                    sys.stdout.write(line)
+                else:
+                    sys.stdout.write('{0}: {1}'.format(node, line))
+        sys.stdout.flush()
+        if all:
+            rdy, _, _ = select.select(all, [], [], 10)
+    sys.exit(exitcode)
+
+
+def run_cmdv(node, cmdv, all, pipedesc):
+    nopen = subprocess.Popen(
+        cmdv, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    pipedesc[nopen.stdout] = {'node': node, 'popen': nopen,
+                              'type': 'stdout'}
+    pipedesc[nopen.stderr] = {'node': node, 'popen': nopen,
+                              'type': 'stderr'}
+    all.add(nopen.stdout)
+    all.add(nopen.stderr)
+
+
+if __name__ == '__main__':
+    run()