add flowwriter example

examples/flowwriter.py

@@ -0,0 +1,17 @@
+from libmproxy.flow import FlowWriter
+import random
+import sys
+
+def start(context, argv):
+    if len(argv) != 2:
+        raise ValueError('Usage: -s "flowriter.py filename"')
+
+    if argv[1] == "-":
+    	f = sys.stdout
+    else:
+    	f = open(argv[1], "wb")
+    context.flow_writer = FlowWriter(f)
+
+def response(context, flow):
+	if random.choice([True, False]):
+		context.flow_writer.add(flow)

test/test_examples.py

@@ -11,7 +11,7 @@ def test_load_scripts():
     tmaster = tservers.TestMaster(config.ProxyConfig())
 
     for f in scripts:
-        if "har_extractor" in f:
+        if "har_extractor" in f or "flowwriter" in f:
             f += " -"
         if "iframe_injector" in f:
             f += " foo"  # one argument required