single node,w/o ceph networking implemented

api/helper.py

@@ -92,9 +92,11 @@ def resolve_image_name(name, etcd_client):
     
     return image_uuid
 
+
 def random_bytes(num=6):
     return [random.randrange(256) for _ in range(num)]
 
+
 def generate_mac(uaa=False, multicast=False, oui=None, separator=':', byte_fmt='%02x'):
     mac = random_bytes()
     if oui:
@@ -112,6 +114,7 @@ def generate_mac(uaa=False, multicast=False, oui=None, separator=':', byte_fmt='
             mac[0] |= 1 << 1 # set bit 1
     return separator.join(byte_fmt % b for b in mac)
 
+
 def get_ip_addr(mac_address, device):
     """Return IP address of a device provided its mac address / link local address
        and the device with which it is connected.
@@ -140,3 +143,23 @@ def get_ip_addr(mac_address, device):
                 if ip.is_global and mac_address == mac:
                     result.append(ip)
         return result
+
+
+def increment_etcd_counter(etcd_client, key):
+    kv = etcd_client.get(key)
+    
+    if kv:
+        counter = int(kv.value)
+        counter = counter + 1
+    else:
+        counter = 1
+    
+    etcd_client.put(key, str(counter))
+    return counter
+
+
+def get_etcd_counter(etcd_client, key):
+    kv = etcd_client.get(key)
+    if kv:
+        return int(kv.value)
+    return None