Initial commit

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

diff --git a/src/dss/server/dss_server.py b/src/dss/server/dss_server.py
new file mode 100644 (file)
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+++ b/src/dss/server/dss_server.py
@@ -0,0 +1,79 @@
+# 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 socket
+import logging
+import select
+import errno
+import os
+
+from dss.server import dss_connection
+from dss.server import dss_config
+from dss.server import dss_rpc_processor
+
+class Server(object):
+    def __init__(self, conf, rpc_processor):
+        self.uds = conf.get_listening_uds()
+        self.rpc_processor = rpc_processor
+        self.transport_type = conf.get_transport_type()
+        self.stopped = False
+        if (self.transport_type == 'stream'):
+            self.server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+        else:
+            self.server = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
+        self.server.setblocking(0)
+        self.remove_uds()
+
+    def start(self):
+        logging.info("Server listening at %s" % self.uds)
+        self.server.bind(self.uds)
+        if self.transport_type == 'stream':
+            self.server.listen(1)
+        inputs = [self.server]
+        while not self.stopped:
+            try:
+                readable, writable, errored = select.select(inputs, [], [])
+                for s in readable:
+                    if s is self.server:
+                        if self.transport_type == 'stream':
+                            client, address = self.server.accept()
+                            client.setblocking(0) #pylint: disable=no-member
+                            conn = dss_connection.Connection(client, address, self.rpc_processor)
+                            inputs.append(conn)
+                            logging.info("Accepted connection from %r" % address)
+                        else:
+                            data, address = self.server.recvfrom(4096)
+                            dss_connection.Connection.recv_dgram(self.server, data, address, self.rpc_processor)
+                    else:
+                        result = s.recv()
+                        if not result:
+                            inputs.remove(s)
+            except (SystemExit, KeyboardInterrupt):
+                break
+            except select.error as e:
+                if e.args[0] == errno.EINTR:
+                    break
+        logging.info("Server stopping")
+        self.remove_uds()
+
+    def remove_uds(self):
+        try:
+            os.unlink(self.uds)
+        except OSError:
+            pass
+
+    def shutdown(self):
+        logging.info("Shutting down tcp server")
+        self.stopped = True