Initial commit

[ta/distributed-state-server.git] / src / dss / server / dss_connection.py

diff --git a/src/dss/server/dss_connection.py b/src/dss/server/dss_connection.py
new file mode 100644 (file)
index 0000000..df732a9
--- /dev/null
+++ b/src/dss/server/dss_connection.py
@@ -0,0 +1,105 @@
+# Copyright 2019 Nokia
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import logging
+import json
+import Queue
+import socket
+import errno
+import time
+
+from dss.server import dss_rpc_processor
+
+class Connection(object):
+    def __init__(self, sock, address, rpc_processor):
+        self.rpc_processor = rpc_processor
+        self.address = address
+        self.sock = sock
+        self.fd = self.sock.makefile('rw', bufsize=0)
+        self.recvbuffer = ""
+        logging.info("Received connection from %r %r" % (address, self))
+
+    def fileno(self):
+        return self.sock.fileno()
+
+    def send_all(self, rep):
+        totalsent = 0
+        msglen = len(rep)
+        while True:
+            try:
+                logging.info("Sending %s %r" % (rep, self))
+                total = self.sock.send(rep[totalsent:])
+                if total == 0:
+                    raise RuntimeError('connection closed!')
+                totalsent += total
+                if totalsent == msglen:
+                    logging.info("Sent successfully %r" % self)
+                    return
+            except socket.error as e:
+                if e.argus[0] == errno.EWOULDBLOCK:
+                    time.sleep(1)
+                else:
+                    raise
+
+    def process_recv_buffer(self, data):
+        self.recvbuffer += data
+        #check for '\n'
+        c = self.recvbuffer.count('\n')
+        parts = None
+        if c:
+            parts = self.recvbuffer.split('\n')
+            if self.recvbuffer.endswith('\n'):
+                self.recvbuffer = ""
+            else:
+                self.recvbuffer = parts[c]
+
+        for i in range(0, c):
+            msg = parts[i]
+            logging.debug("Received %s %r" % (msg, self))
+            # strip the req
+            msg = msg.lstrip('\x00').rstrip('\x00')
+            rep = self.rpc_processor.process(msg)
+            self.send_all(rep+'\n')
+
+
+
+
+    def recv(self):
+       data = None
+        try:
+            data = self.sock.recv(1024)
+            if not data:
+                logging.info("Client %r %r disconnected" % (self.address, self))
+                return False
+            self.process_recv_buffer(data)
+        except socket.error as e:
+            if e.args[0] == errno.EWOULDBLOCK:
+                return True
+        except Exception as exp:
+            logging.warning('Failed when processing %s got exp %s' % (data, exp))
+            return False
+
+        return True
+
+    @staticmethod
+    def recv_dgram(sock, req, address, rpc_processor):
+        logging.debug("Received %s address is %r" % (req, address))
+        try:
+            # convert to json structure
+            rep = rpc_processor.process(req)
+            # add '/n'
+            sock.sendto(rep+'\n', address)
+        except Exception as exp:
+            logging.warning('Failed when processing %s got exp %s' % (req, exp))