Add echo server, make it randomly take 2 secs.

experimental/example/Makefile

@@ -1,7 +1,7 @@
 CC=gcc
 CFLAGS=-g -lpthread
 
-all: qotd.marker app.marker client.marker searchapp.marker shout.marker frontend.marker
+all: qotd.marker app.marker client.marker searchapp.marker shout.marker frontend.marker echo.marker
 
 qotd/qotd: qotd/qotd.o
 	gcc -o $@ $< $(CFLAGS)
@@ -21,6 +21,7 @@ client.marker: client/*
 searchapp.marker: searchapp/* searchapp/searchapp
 shout.marker: shout/* shout/shout
 frontend.marker: frontend/*
+echo.marker: echo/*
 %.marker:
 	docker build -t tomwilkie/$(<D) $(<D)/
 	touch $@

experimental/example/app/app.py

@@ -37,6 +37,10 @@ def do_search():
   r = sessions.session.get(random.choice(searchapps))
   return r.text
 
+def do_echo(text):
+  r = requests.get("http://echo/", data=text)
+  return r.text
+
 def ignore_error(f):
   try:
     return str(f())
@@ -47,7 +51,7 @@ def ignore_error(f):
 @app.route('/')
 def hello():
   qotd_msg = do_qotd()
-  qotd_msg += do_qotd()
+  qotd_msg = do_echo(qotd_msg)
   return qotd_msg
 
 if __name__ == "__main__":

experimental/example/echo/Dockerfile

@@ -0,0 +1,8 @@
+FROM python:2.7
+MAINTAINER Weaveworks Inc <help@weave.works>
+WORKDIR /home/weave
+ADD requirements.txt /home/weave/
+RUN pip install -r /home/weave/requirements.txt
+ADD echo.py /home/weave/
+EXPOSE 5000
+ENTRYPOINT ["python", "/home/weave/echo.py"]

experimental/example/echo/echo.py

@@ -0,0 +1,27 @@
+import os
+import socket
+import sys
+import random
+import time
+import threading
+import logging
+
+
+from flask import Flask
+from flask import request
+from werkzeug.serving import WSGIRequestHandler
+
+app = Flask(__name__)
+
+@app.route('/')
+def hello():
+  if random.random() > 0.6:
+    time.sleep(2)
+  else:
+    time.sleep(0.5)
+  return request.data
+
+if __name__ == "__main__":
+  logging.basicConfig(format='%(asctime)s %(levelname)s %(filename)s:%(lineno)d - %(message)s', level=logging.INFO)
+  WSGIRequestHandler.protocol_version = "HTTP/1.0"
+  app.run(host="0.0.0.0", port=80, debug=True)

experimental/example/echo/requirements.txt

@@ -0,0 +1,2 @@
+flask
+

experimental/example/run.sh

@@ -21,4 +21,4 @@ start_container() {
 
 start_container 1 tomwilkie/qotd qotd
 start_container 1 tomwilkie/app app
-
+start_container 1 tomwilkie/echo echo