Use sessions for the pyapp -> goapp link too.

experimental/example/docker-compose.yml

@@ -5,7 +5,7 @@ client:
     - pyapp
 pyapp:
   build: pyapp
-  ports:
+  expose:
     - "5000"
   links:
     - qotd
@@ -20,7 +20,7 @@ redis:
   image: redis
 goapp1:
   build: goapp
-  ports:
+  expose:
     - "8080"
   links:
     - elasticsearch1
@@ -28,7 +28,7 @@ goapp1:
     - elasticsearch3
 goapp2:
   build: goapp
-  ports:
+  expose:
     - "8080"
   links:
     - elasticsearch1

experimental/example/pyapp/app.py

@@ -2,6 +2,7 @@ import os
 import socket
 import requests
 import random
+import threading
 
 from concurrent.futures import ThreadPoolExecutor
 from flask import Flask
@@ -10,6 +11,7 @@ from redis import Redis
 app = Flask(__name__)
 redis = Redis(host='redis', port=6379)
 pool = ThreadPoolExecutor(max_workers=10)
+sessions = threading.local()
 
 goapps = ['http://goapp1:8080/', 'http://goapp2:8080/']
 
@@ -27,10 +29,11 @@ def do_qotd():
     s.close()
 
 def do_search():
-  r = requests.get(random.choice(goapps))
+  if getattr(sessions, 'session', None) == None:
+    sessions.session = requests.Session()
+  r = sessions.session.get(random.choice(goapps))
   return r.text
 
-
 @app.route('/')
 def hello():
   counter_future = pool.submit(do_redis)