Ignore Pings Quicker than MAX_PING

dataserv/Farmer.py

@@ -111,8 +111,12 @@ def ping(self):
 
         """
         farmer = self.lookup()
-        farmer.last_seen = datetime.utcnow()
-        db.session.commit()
+        time_limit = (datetime.utcnow() - farmer.last_seen).seconds <= app.config["MAX_PING"]
+
+        if time_limit:
+            farmer.last_seen = datetime.utcnow()
+            db.session.commit()
+        # else just ignore
 
     # TODO: Actually do an audit.
     def audit(self):

dataserv/config.py

@@ -1,3 +1,4 @@
+MAX_PING = 15  # seconds
 ONLINE_TIME = 15  # minutes
 SQLALCHEMY_DATABASE_URI = "sqlite:///dataserv.db"
 

tests/test_Farmer.py

@@ -1,3 +1,4 @@
+import time
 import json
 import unittest
 from time import mktime
@@ -64,6 +65,18 @@ def test_ping(self):
         ping_time = farmer.last_seen
         self.assertTrue(register_time < ping_time)
 
+    def test_ping_time_limit(self):
+        farmer = Farmer(addresses["beta"])
+        farmer.register()
+
+        farmer.ping()
+        time.sleep(2)
+        farmer.ping()
+
+        # should still be around 2
+        delta_seconds = int((farmer.last_seen - datetime.utcnow()).seconds)
+        self.assertNotEqual(delta_seconds, 0)
+
     def test_height(self):
         farmer = Farmer(addresses["gamma"])
         farmer.register()