Have examples run in the py27 environment and make them work

It is great to ensure that the examples that tooz has actually run
during testing time, so enable this as well as adjust the examples
to create unique group ids and run for a limited amount of time instead
of running forever (and fix a few other brokeness)...

Change-Id: I573cf5946a1d3f13862c0c28cf3a5d7fc6178873

examples/coordinator.py

@@ -1,5 +1,5 @@
 from tooz import coordination
 
-coordinator = coordination.get_coordinator('zookeeper://localhost', b'host-1')
+coordinator = coordination.get_coordinator('kazoo://localhost', b'host-1')
 coordinator.start()
 coordinator.stop()

examples/coordinator_heartbeat.py

@@ -2,10 +2,13 @@ import time
 
 from tooz import coordination
 
+ALIVE_TIME = 5
+
 coordinator = coordination.get_coordinator('memcached://localhost', b'host-1')
 coordinator.start()
 
-while True:
+start = time.time()
+while time.time() - start < ALIVE_TIME:
     coordinator.heartbeat()
     time.sleep(0.1)
 

examples/group_membership.py

@@ -1,14 +1,19 @@
+import uuid
+
+import six
+
 from tooz import coordination
 
-coordinator = coordination.get_coordinator('zookeeper://localhost', b'host-1')
+coordinator = coordination.get_coordinator('kazoo://localhost', b'host-1')
 coordinator.start()
 
 # Create a group
-request = coordinator.create_group(b"my group")
+group = six.binary_type(six.text_type(uuid.uuid4()).encode('ascii'))
+request = coordinator.create_group(group)
 request.get()
 
 # Join a group
-request = coordinator.join_group(b"my group")
+request = coordinator.join_group(group)
 request.get()
 
 coordinator.stop()

examples/group_membership_watch.py

@@ -1,10 +1,15 @@
+import uuid
+
+import six
+
 from tooz import coordination
 
-coordinator = coordination.get_coordinator('zookeeper://localhost', b'host-1')
+coordinator = coordination.get_coordinator('kazoo://localhost', b'host-1')
 coordinator.start()
 
 # Create a group
-request = coordinator.create_group(b"my group")
+group = six.binary_type(six.text_type(uuid.uuid4()).encode('ascii'))
+request = coordinator.create_group(group)
 request.get()
 
 
@@ -13,6 +18,5 @@ def group_joined(event):
     print(event.group_id, event.member_id)
 
 
-coordinator.watch_join_group(b"my group", group_joined)
-
+coordinator.watch_join_group(group, group_joined)
 coordinator.stop()

examples/leader_election.py

@@ -1,14 +1,21 @@
+import time
+import uuid
+
+import six
+
 from tooz import coordination
 
-coordinator = coordination.get_coordinator('zookeeper://localhost', b'host-1')
+ALIVE_TIME = 1
+coordinator = coordination.get_coordinator('kazoo://localhost', b'host-1')
 coordinator.start()
 
 # Create a group
-request = coordinator.create_group(b"my group")
+group = six.binary_type(six.text_type(uuid.uuid4()).encode('ascii'))
+request = coordinator.create_group(group)
 request.get()
 
 # Join a group
-request = coordinator.join_group(b"my group")
+request = coordinator.join_group(group)
 request.get()
 
 
@@ -18,11 +25,12 @@ def when_i_am_elected_leader(event):
 
 
 # Propose to be a leader for the group
-coordinator.watch_elected_as_leader(b"my_group",
-                                    when_i_am_elected_leader)
+coordinator.watch_elected_as_leader(group, when_i_am_elected_leader)
 
-while True:
+start = time.time()
+while time.time() - start < ALIVE_TIME:
     coordinator.heartbeat()
     coordinator.run_watchers()
+    time.sleep(0.1)
 
 coordinator.stop()

run-examples.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -e
+
+python_version=$(python --version 2>&1)
+echo "Running using '$python_version'"
+for filename in examples/*.py; do
+    echo "Activating '$filename'"
+    python $filename
+done

tox.ini

@@ -20,6 +20,7 @@ commands = {posargs}
 deps = {[testenv]deps}
     doc8
 commands = bash -x {toxinidir}/setup-test-env.sh python setup.py testr --slowest --testr-args="{posargs}"
+    bash -x {toxinidir}/setup-test-env.sh {toxinidir}/run-examples.sh
     doc8 doc/source
 
 [testenv:cover]