From ce4cb42cb521260e2f7091dd80b136320f32663f Mon Sep 17 00:00:00 2001
From: "Kali Kaneko (leap communications)" <kali@leap.se>
Date: Thu, 31 Mar 2016 21:54:49 -0400
Subject: pass FIB parameter as environment variable

---
 README.rst |  6 ++++++
 server.py  | 10 ++++++++--
 server2.py | 12 +++++++++---
 server3.py | 13 +++++++------
 tasks.py   | 17 +++++++++++++----
 5 files changed, 43 insertions(+), 15 deletions(-)

diff --git a/README.rst b/README.rst
index 77f0ec3..3cfcc21 100644
--- a/README.rst
+++ b/README.rst
@@ -20,6 +20,12 @@ performance::
   make perf-little    # runs httperf against the server, (less requests).
   make perf-easy      # runs httperf against a no-cpu load.
 
+If you want to modify the cpu load, you can pass the FIB parameter as an
+environment variable::
+  FIB=20 make inline-server
+  curl localhost:8080/
+  $ answer is >>> 6765
+
 
 Analysis
 ---------------
diff --git a/server.py b/server.py
index 240de67..4afa31b 100644
--- a/server.py
+++ b/server.py
@@ -1,11 +1,17 @@
+import os
 from klein import run, route
+import tasks
 
-from tasks import fib
+FIB = os.environ.get('FIB', tasks.FIB_DEFAULT)
 
 
 @route('/')
 def home(request):
-    return 'answer is >> %s' % fib(30)
+    return 'answer is >>> %s\n' % tasks.fib(FIB)
+
+@route('/hi')
+def ping(request):
+    return 'easy!'
 
 if __name__ == "__main__":
     run("localhost", 8080)
diff --git a/server2.py b/server2.py
index 5f9c32e..268c7c5 100644
--- a/server2.py
+++ b/server2.py
@@ -1,14 +1,20 @@
+import os
 from klein import run, route
 from twisted.internet.threads import deferToThread
+import tasks
 
-from tasks import fib
+FIB = os.environ.get('FIB', tasks.FIB_DEFAULT)
 
 
 @route('/')
 def home(request):
-    d = deferToThread(fib, 30)
-    d.addCallback(lambda result: 'answer is >> %s' % result)
+    d = deferToThread(tasks.fib, FIB)
+    d.addCallback(lambda result: 'answer is >>> %s\n' % result)
     return d
 
+@route('/hi')
+def ping(request):
+    return 'easy!'
+
 if __name__ == "__main__":
     run("localhost", 8080)
diff --git a/server3.py b/server3.py
index e5127dc..f0a44cd 100644
--- a/server3.py
+++ b/server3.py
@@ -1,23 +1,24 @@
+import os
+import sys
 from klein import run, route
 
 from twisted.internet import defer
 from twisted.internet import reactor
+from twisted.python import log
 
 from ampoule import pool
 
 import tasks
 
-import sys
-from twisted.python import log
-
 log.startLogging(sys.stdout)
 
+FIB = os.environ.get('FIB', tasks.FIB_DEFAULT)
+
 
 @route('/')
 def home(request):
-
-    d = pp.doWork(tasks.Fib)
-    d.addCallback(lambda res: str(res['fib']))
+    d = pp.doWork(tasks.Fib, n=int(FIB)) 
+    d.addCallback(lambda res: 'answer is >>> {r}\n'.format(r=res['fib']))
     return d
 
 @route('/hi')
diff --git a/tasks.py b/tasks.py
index 737f540..3f8b85d 100644
--- a/tasks.py
+++ b/tasks.py
@@ -1,20 +1,29 @@
+import os
 from twisted.protocols import amp
 from ampoule import child
 
+FIB_DEFAULT = 30
+
 
 def fib(n):
+    '''very silly fibonacci function.
+    do not try to optimize this, the idea is to make your cpu suffer for a
+    while'''
+    n = int(n)
     if n <= 2:
         return 1
     else:
         return fib(n-1) + fib(n-2)
 
+# ampoule stuff
 
 class Fib(amp.Command):
-    response = [("fib", amp.Integer())]
+    arguments = [('n', amp.Integer())]
+    response = [('fib', amp.Integer())]
 
 
 class FibCalculator(child.AMPChild):
     @Fib.responder
-    def fib(self):
-        print 'called responder, fib...'
-        return {"fib": fib(30)}
+    def fib(self, n):
+        #print "FIB FUNCTION CALLED WITH", n
+        return {"fib": fib(n)}
-- 
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