Link together all the containers in the example app.

experimental/example/pyapp/Dockerfile

@@ -1,6 +1,7 @@
 FROM python:2.7
 MAINTAINER Weaveworks Inc <help@weave.works>
-ADD . /home/weave
 WORKDIR /home/weave
+ADD requirements.txt /home/weave/
 RUN pip install -r /home/weave/requirements.txt
+ADD app.py /home/weave/
 ENTRYPOINT ["python", "/home/weave/app.py"]

experimental/example/pyapp/app.py

@@ -1,15 +1,41 @@
 import os
-
+import socket
+import requests
+from concurrent.futures import ThreadPoolExecutor
 from flask import Flask
 from redis import Redis
 
 app = Flask(__name__)
 redis = Redis(host='redis', port=6379)
+pool = ThreadPoolExecutor(max_workers=10)
+
+def do_redis():
+  redis.incr('hits')
+  return redis.get('hits')
+
+def do_qotd():
+  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+  try:
+    s.connect(("qotd", 4446))
+    s.send("Hello")
+    return s.recv(1024)
+  finally:
+    s.close()
+
+def do_search():
+  r = requests.get('http://goapp:8080/')
+  return r.text
+
 
 @app.route('/')
 def hello():
-  redis.incr('hits')
-  return 'Hello World! I have been seen %s times.' % redis.get('hits')
+  counter_future = pool.submit(do_redis)
+  search_future = pool.submit(do_search)
+  qotd_future = pool.submit(do_qotd)
+  result = 'Hello World! I have been seen %s times.' % counter_future.result()
+  result += search_future.result()
+  result += qotd_future.result()
+  return result
 
 if __name__ == "__main__":
   app.run(host="0.0.0.0", debug=True)

experimental/example/pyapp/requirements.txt

@@ -2,4 +2,3 @@ flask
 redis
 requests
 futures
-requests-futures