--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/py/receive.py	Tue Feb 11 23:48:03 2014 +0800
@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+
+import params
+import json
+import sys
+import tempfile
+import signal
+import os
+
+import config
+
+
+def same_type(a, b):
+    ta = type(a)
+    tb = type(b)
+
+    if ta == int:
+        ta = float
+    if tb == int:
+        tb = float
+
+    return (ta == tb)
+
+def main():
+
+    i = sys.stdin.read()
+    new_params = json.loads(i)
+
+    def_params = params.Params()
+
+    if def_params.viewkeys() != new_params.viewkeys():
+        diff = def_params.viewkeys() ^ new_params.viewkeys()
+        return "Mismatching params, %s" % str(diff)
+
+    for k, v in new_params.items():
+        if not same_type(v, def_params[k]):
+            return "Bad type for %s" % k
+
+    dir = os.path.dirname(config.PARAMS_FILE)
+
+    try:
+        t = tempfile.NamedTemporaryFile(prefix='config',
+            dir = dir,
+            delete = False)
+
+        t.write(json.dumps(new_params, sort_keys=True, indent=4)+'\n')
+
+        os.rename(t.name, config.PARAMS_FILE)
+    except Exception, e:
+        return "Problem: %s" % e
+
+    try:
+        pid = int(open('%s/tempserver.pid' % dir, 'r').read())
+        if pid < 2:
+            return "Bad pid %d" % pid
+        os.kill(pid, signal.SIGHUP)
+    except Exception, e:
+        return "HUP problem: %s" % e
+
+    return 'Good Update'
+
+if __name__ == '__main__':
+    print main()
+