app: add simple bmp station application

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/app/bmpstation.py

@@ -0,0 +1,48 @@
+import socket
+import logging
+logging.basicConfig(level=logging.DEBUG)
+
+from ryu.base import app_manager
+
+from ryu.lib import hub
+from ryu.lib.hub import StreamServer
+from ryu.lib.packet.bmp import *
+
+SERVER_HOST = '0.0.0.0'
+SERVER_PORT = 11019
+
+
+class BMPStation(app_manager.RyuApp):
+    def __init__(self):
+        super(BMPStation, self).__init__()
+        self.name = 'bmpstation'
+
+    def start(self):
+        super(BMPStation, self).start()
+
+        return hub.spawn(StreamServer((SERVER_HOST, SERVER_PORT),
+                                      self.loop).serve_forever)
+
+    def loop(self, sock, addr):
+        logging.debug("started bmp loop.")
+        self.is_active = True
+
+        buf = bytearray()
+        required_len = BMPMessage._HDR_LEN
+
+        while self.is_active:
+            buf = sock.recv(BMPMessage._HDR_LEN)
+            if len(buf) == 0:
+                self.is_active = False
+                break
+
+            _, len_, _ = BMPMessage.parse_header(buf)
+
+            body = sock.recv(len_ - BMPMessage._HDR_LEN)
+            if len(body) == 0:
+                self.is_active = False
+                break
+
+            msg, rest = BMPMessage.parser(buf + body)
+            assert len(rest) == 0
+            print msg, '\n'