[GitHub] merlimat closed pull request #1289: Watch-znode script for docker image

[GitBox <gi...@apache.org>]

merlimat closed pull request #1289: Watch-znode script for docker image
URL: https://github.com/apache/incubator-pulsar/pull/1289
 
 
   

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diff --git a/docker/pulsar/Dockerfile b/docker/pulsar/Dockerfile
index 395f5a330..87ef64f17 100644
--- a/docker/pulsar/Dockerfile
+++ b/docker/pulsar/Dockerfile
@@ -20,7 +20,7 @@
 FROM openjdk:8-jdk
 
 # Install some utilities
-RUN apt-get update && apt-get install -y netcat dnsutils
+RUN apt-get update && apt-get install -y netcat dnsutils python-kazoo
 
 ARG PULSAR_TARBALL
 
@@ -30,6 +30,7 @@ RUN mv /apache-pulsar-* /pulsar
 COPY scripts/apply-config-from-env.py /pulsar/bin
 COPY scripts/generate-zookeeper-config.sh /pulsar/bin
 COPY scripts/pulsar-zookeeper-ruok.sh /pulsar/bin
+COPY scripts/watch-znode.py /pulsar/bin
 
 WORKDIR /pulsar
 
diff --git a/docker/pulsar/scripts/watch-znode.py b/docker/pulsar/scripts/watch-znode.py
new file mode 100755
index 000000000..24ce19ba7
--- /dev/null
+++ b/docker/pulsar/scripts/watch-znode.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python
+#
+# 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.
+#
+
+import sys, getopt, time
+from kazoo.client import KazooClient
+
+def usage():
+    print >> sys.stderr, "\n%s -z <zookeeper> -p <path> [-w|-c|-e]" % (sys.argv[0])
+    print >> sys.stderr, "\nWait for, or create znode"
+    print >> sys.stderr, "\n-z Specify zookeeper connect string"
+    print >> sys.stderr, "\n-p Znode path to watch or create"
+    print >> sys.stderr, "\n-w Watch for path creation"
+    print >> sys.stderr, "\n-c Create path"
+    print >> sys.stderr, "\n-e Check if znode exists"
+
+try:
+    opts, args = getopt.getopt(sys.argv[1:], "z:p:cweh")
+except getopt.GetoptError as err:
+    print >> sys.stderr, str(err)
+    usage()
+    sys.exit(2)
+
+zookeeper = None
+znode = None
+create = False
+watch = False
+exists = False
+
+for o, a in opts:
+    if o in ("-h"):
+        usage()
+        sys.exit()
+    elif o in ("-z"):
+        zookeeper = a
+    elif o in ("-p"):
+        znode = a
+    elif o in ("-w"):
+        watch = True
+    elif o in ("-c"):
+        create = True
+    elif o in ("-e"):
+        exists = True
+    else:
+        assert False, "unhandled option"
+        usage()
+        sys.exit(2)
+
+if not zookeeper:
+    print >> sys.stderr, "Zookeeper must be specified"
+    usage()
+    sys.exit(3)
+
+if not znode:
+    print >> sys.stderr, "Znode must be specified"
+    usage()
+    sys.exit(4)
+
+if (not watch and not create and not exists):
+    print >> sys.stderr, "Exactly one of watch (-w), create (-c) or exists (-e) must be specified"
+    usage()
+    sys.exit(5)
+
+zk = KazooClient(hosts=zookeeper)
+zk.start()
+
+if create:
+    zk.create(znode)
+elif watch:
+    while not zk.exists(znode):
+        print "Waiting for %s" % znode
+        time.sleep(1)
+elif exists:
+    if zk.exists(znode):
+        sys.exit(0)
+    else:
+        sys.exit(-1)
+
+zk.stop()


 

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