From c5d69764711752b1b5ad9fa1ccfd91af071c9dd9 Mon Sep 17 00:00:00 2001
From: Saggi Mizrahi <saggi.mizrahi@huawei.com>
Date: Mon, 13 Jul 2015 18:22:55 +0300
Subject: [PATCH] cascade_service framework

This is the base implementation. It adds all the devstack boilerplate
and connects to the network plugins' requests.

Change-Id: Ibd61153e755e1c218503b0671c242ff50b5ebdc8
---
 cmd/cascade_service.py                        |  41 ++
 devstack/local.conf.sample                    |   3 +
 devstack/plugin.sh                            |  29 ++
 devstack/settings                             |   8 +
 etc/cascade_service.conf                      | 482 ++++++++++++++++++
 tricircle/cascade_service/__init__.py         |   0
 .../cascade_service/endpoints/__init__.py     |   0
 .../cascade_service/endpoints/networking.py   |  52 ++
 tricircle/cascade_service/service.py          |  65 +++
 tricircle/common/__init__.py                  |   0
 10 files changed, 680 insertions(+)
 create mode 100644 cmd/cascade_service.py
 create mode 100644 etc/cascade_service.conf
 create mode 100644 tricircle/cascade_service/__init__.py
 create mode 100644 tricircle/cascade_service/endpoints/__init__.py
 create mode 100644 tricircle/cascade_service/endpoints/networking.py
 create mode 100644 tricircle/cascade_service/service.py
 create mode 100644 tricircle/common/__init__.py

diff --git a/cmd/cascade_service.py b/cmd/cascade_service.py
new file mode 100644
index 00000000..1160ce95
--- /dev/null
+++ b/cmd/cascade_service.py
@@ -0,0 +1,41 @@
+# Copyright 2015 Huawei Technologies Co., Ltd.
+#
+# 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 eventlet
+
+if __name__ == "__main__":
+    eventlet.monkey_patch()
+
+import sys
+
+from oslo_log import log as logging
+from oslo_config import cfg
+
+import tricircle.cascade_service.service as service
+
+
+def process_command_line_arguments():
+    conf = cfg.ConfigOpts()
+    logging.register_options(conf)
+    logging.set_defaults()
+    conf(sys.argv[1:])
+    logging.setup(conf, "cascade_service", version='0.1')
+
+if __name__ == "__main__":
+    process_command_line_arguments()
+    server = service.setup_server()
+    server.start()
+    server.wait()
diff --git a/devstack/local.conf.sample b/devstack/local.conf.sample
index c3356230..f02574bb 100644
--- a/devstack/local.conf.sample
+++ b/devstack/local.conf.sample
@@ -31,6 +31,9 @@ PUBLIC_NETWORK_GATEWAY=10.100.100.3
 Q_ENABLE_TRICIRCLE=True
 enable_plugin tricircle https://git.openstack.org/cgit/stackforge/tricircle/ experiment
 
+# Tricircle Services
+enable_service t-svc
+
 # Use Neutron instead of nova-network
 disable_service n-net
 enable_service q-svc
diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index ca7d5152..e22b09e6 100644
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -5,9 +5,24 @@ function configure_tricircle_plugin {
     if is_service_enabled q-svc ; then
         Q_PLUGIN_CLASS="tricircle.networking_tricircle.plugin.TricirclePlugin"
 
+        #NEUTRON_CONF=/etc/neutron/neutron.conf
         iniset $NEUTRON_CONF DEFAULT core_plugin "$Q_PLUGIN_CLASS"
         iniset $NEUTRON_CONF DEFAULT service_plugins ""
     fi
+
+    if is_service_enabled t-svc ; then
+	echo "Configuring Neutron for Tricircle Cascade Service"
+	sudo install -d -o $STACK_USER -m 755 $TRICIRCLE_CONF_DIR
+	cp -p $TRICIRCLE_DIR/etc/cascade_service.conf $TRICIRCLE_CASCADE_CONF
+
+	iniset $TRICIRCLE_CASCADE_CONF DEFAULT debug $ENABLE_DEBUG_LOG_LEVEL
+	iniset $TRICIRCLE_CASCADE_CONF DEFAULT verbose true
+	setup_colorized_logging $TRICIRCLE_CASCADE_CONF DEFAULT
+	iniset $TRICIRCLE_CASCADE_CONF DEFAULT bind_host $TRICIRCLE_CASCADE_LISTEN_ADDRESS
+	iniset $TRICIRCLE_CASCADE_CONF DEFAULT use_syslog $SYSLOG
+	iniset_rpc_backend tricircle $TRICIRCLE_CASCADE_CONF
+	iniset $TRICIRCLE_CASCADE_CONF database connection `database_connection_url tricircle`
+    fi
 }
 
 
@@ -24,5 +39,19 @@ if [[ "$Q_ENABLE_TRICIRCLE" == "True" ]]; then
         echo_summary "Configure Tricircle"
         configure_tricircle_plugin
         echo export PYTHONPATH=\$PYTHONPATH:$TRICIRCLE_DIR >> $RC_DIR/.localrc.auto
+
+    elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
+        echo_summary "Initializing Cascading Service"
+
+        if is_service_enabled t-svc; then
+            run_process t-svc "python $TRICIRCLE_CASCADE_SERVICE --config-file $TRICIRCLE_CASCADE_CONF"
+        fi
+    fi
+
+    if [[ "$1" == "unstack" ]]; then
+
+        if is_service_enabled t-svc; then
+           stop_process t-svc
+        fi
     fi
 fi
diff --git a/devstack/settings b/devstack/settings
index 582a230c..035d54ea 100644
--- a/devstack/settings
+++ b/devstack/settings
@@ -3,4 +3,12 @@ TRICIRCLE_REPO=${TRICIRCLE_REPO:-https://git.openstack.org/cgit/stackforge/trici
 TRICIRCLE_DIR=$DEST/tricircle
 TRICIRCLE_BRANCH=${TRICIRCLE_BRANCH:-master}
 
+# common variables
+TRICIRCLE_CONF_DIR=${TRICIRCLE_CONF_DIR:-/etc/tricircle}
+
+# cascade service
+TRICIRCLE_CASCADE_SERVICE=$TRICIRCLE_DIR/cmd/cascade_service.py
+TRICIRCLE_CASCADE_CONF=$TRICIRCLE_CONF_DIR/cascade_service.conf
+TRICIRCLE_CASCADE_LISTEN_ADDRESS=${TRICIRCLE_CASCADE_LISTEN_ADDRESS:-0.0.0.0}
+
 export PYTHONPATH=$PYTHONPATH:$TRICIRCLE_DIR
diff --git a/etc/cascade_service.conf b/etc/cascade_service.conf
new file mode 100644
index 00000000..3a4dba71
--- /dev/null
+++ b/etc/cascade_service.conf
@@ -0,0 +1,482 @@
+[DEFAULT]
+# Print more verbose output (set logging level to INFO instead of default WARNING level).
+# verbose = True
+
+# Print debugging output (set logging level to DEBUG instead of default WARNING level).
+# debug = True
+
+# log_format = %(asctime)s %(levelname)8s [%(name)s] %(message)s
+# log_date_format = %Y-%m-%d %H:%M:%S
+
+# use_syslog                           -> syslog
+# log_file and log_dir                 -> log_dir/log_file
+# (not log_file) and log_dir           -> log_dir/{binary_name}.log
+# use_stderr                           -> stderr
+# (not user_stderr) and (not log_file) -> stdout
+# publish_errors                       -> notification system
+
+# use_syslog = False
+# syslog_log_facility = LOG_USER
+
+# use_stderr = True
+# log_file =
+# log_dir =
+
+# publish_errors = False
+
+# Address to bind the API server to
+# bind_host = 0.0.0.0
+
+# Port the bind the API server to
+# bind_port = 9696
+
+#
+# Options defined in oslo.messaging
+#
+
+# Use durable queues in amqp. (boolean value)
+# Deprecated group/name - [DEFAULT]/rabbit_durable_queues
+# amqp_durable_queues=false
+
+# Auto-delete queues in amqp. (boolean value)
+# amqp_auto_delete=false
+
+# Size of RPC connection pool. (integer value)
+# rpc_conn_pool_size=30
+
+# Qpid broker hostname. (string value)
+# qpid_hostname=localhost
+
+# Qpid broker port. (integer value)
+# qpid_port=5672
+
+# Qpid HA cluster host:port pairs. (list value)
+# qpid_hosts=$qpid_hostname:$qpid_port
+
+# Username for Qpid connection. (string value)
+# qpid_username=
+
+# Password for Qpid connection. (string value)
+# qpid_password=
+
+# Space separated list of SASL mechanisms to use for auth.
+# (string value)
+# qpid_sasl_mechanisms=
+
+# Seconds between connection keepalive heartbeats. (integer
+# value)
+# qpid_heartbeat=60
+
+# Transport to use, either 'tcp' or 'ssl'. (string value)
+# qpid_protocol=tcp
+
+# Whether to disable the Nagle algorithm. (boolean value)
+# qpid_tcp_nodelay=true
+
+# The qpid topology version to use.  Version 1 is what was
+# originally used by impl_qpid.  Version 2 includes some
+# backwards-incompatible changes that allow broker federation
+# to work.  Users should update to version 2 when they are
+# able to take everything down, as it requires a clean break.
+# (integer value)
+# qpid_topology_version=1
+
+# SSL version to use (valid only if SSL enabled). valid values
+# are TLSv1, SSLv23 and SSLv3. SSLv2 may be available on some
+# distributions. (string value)
+# kombu_ssl_version=
+
+# SSL key file (valid only if SSL enabled). (string value)
+# kombu_ssl_keyfile=
+
+# SSL cert file (valid only if SSL enabled). (string value)
+# kombu_ssl_certfile=
+
+# SSL certification authority file (valid only if SSL
+# enabled). (string value)
+# kombu_ssl_ca_certs=
+
+# How long to wait before reconnecting in response to an AMQP
+# consumer cancel notification. (floating point value)
+# kombu_reconnect_delay=1.0
+
+# The RabbitMQ broker address where a single node is used.
+# (string value)
+# rabbit_host=localhost
+
+# The RabbitMQ broker port where a single node is used.
+# (integer value)
+# rabbit_port=5672
+
+# RabbitMQ HA cluster host:port pairs. (list value)
+# rabbit_hosts=$rabbit_host:$rabbit_port
+
+# Connect over SSL for RabbitMQ. (boolean value)
+# rabbit_use_ssl=false
+
+# The RabbitMQ userid. (string value)
+# rabbit_userid=guest
+
+# The RabbitMQ password. (string value)
+# rabbit_password=guest
+
+# the RabbitMQ login method (string value)
+# rabbit_login_method=AMQPLAIN
+
+# The RabbitMQ virtual host. (string value)
+# rabbit_virtual_host=/
+
+# How frequently to retry connecting with RabbitMQ. (integer
+# value)
+# rabbit_retry_interval=1
+
+# How long to backoff for between retries when connecting to
+# RabbitMQ. (integer value)
+# rabbit_retry_backoff=2
+
+# Maximum number of RabbitMQ connection retries. Default is 0
+# (infinite retry count). (integer value)
+# rabbit_max_retries=0
+
+# Use HA queues in RabbitMQ (x-ha-policy: all). If you change
+# this option, you must wipe the RabbitMQ database. (boolean
+# value)
+# rabbit_ha_queues=false
+
+# If passed, use a fake RabbitMQ provider. (boolean value)
+# fake_rabbit=false
+
+# ZeroMQ bind address. Should be a wildcard (*), an ethernet
+# interface, or IP. The "host" option should point or resolve
+# to this address. (string value)
+# rpc_zmq_bind_address=*
+
+# MatchMaker driver. (string value)
+# rpc_zmq_matchmaker=oslo.messaging._drivers.matchmaker.MatchMakerLocalhost
+
+# ZeroMQ receiver listening port. (integer value)
+# rpc_zmq_port=9501
+
+# Number of ZeroMQ contexts, defaults to 1. (integer value)
+# rpc_zmq_contexts=1
+
+# Maximum number of ingress messages to locally buffer per
+# topic. Default is unlimited. (integer value)
+# rpc_zmq_topic_backlog=
+
+# Directory for holding IPC sockets. (string value)
+# rpc_zmq_ipc_dir=/var/run/openstack
+
+# Name of this node. Must be a valid hostname, FQDN, or IP
+# address. Must match "host" option, if running Nova. (string
+# value)
+# rpc_zmq_host=oslo
+
+# Seconds to wait before a cast expires (TTL). Only supported
+# by impl_zmq. (integer value)
+# rpc_cast_timeout=30
+
+# Heartbeat frequency. (integer value)
+# matchmaker_heartbeat_freq=300
+
+# Heartbeat time-to-live. (integer value)
+# matchmaker_heartbeat_ttl=600
+
+# Size of RPC greenthread pool. (integer value)
+# rpc_thread_pool_size=64
+
+# Driver or drivers to handle sending notifications. (multi
+# valued)
+# notification_driver=
+
+# AMQP topic used for OpenStack notifications. (list value)
+# Deprecated group/name - [rpc_notifier2]/topics
+# notification_topics=notifications
+
+# Seconds to wait for a response from a call. (integer value)
+# rpc_response_timeout=60
+
+# A URL representing the messaging driver to use and its full
+# configuration. If not set, we fall back to the rpc_backend
+# option and driver specific configuration. (string value)
+# transport_url=
+
+# The messaging driver to use, defaults to rabbit. Other
+# drivers include qpid and zmq. (string value)
+# rpc_backend=rabbit
+
+# The default exchange under which topics are scoped. May be
+# overridden by an exchange name specified in the
+# transport_url option. (string value)
+# control_exchange=openstack
+
+[database]
+# This line MUST be changed to actually run the plugin.
+# Example:
+# connection = mysql+pymysql://root:pass@127.0.0.1:3306/neutron
+# Replace 127.0.0.1 above with the IP address of the database used by the
+# main neutron server. (Leave it as is if the database runs on this host.)
+# connection = sqlite://
+# NOTE: In deployment the [database] section and its connection attribute may
+# be set in the corresponding core plugin '.ini' file. However, it is suggested
+# to put the [database] section and its connection attribute in this
+# configuration file.
+
+# Database engine for which script will be generated when using offline
+# migration
+# engine =
+
+# The SQLAlchemy connection string used to connect to the slave database
+# slave_connection =
+
+# Database reconnection retry times - in event connectivity is lost
+# set to -1 implies an infinite retry count
+# max_retries = 10
+
+# Database reconnection interval in seconds - if the initial connection to the
+# database fails
+# retry_interval = 10
+
+# Minimum number of SQL connections to keep open in a pool
+# min_pool_size = 1
+
+# Maximum number of SQL connections to keep open in a pool
+# max_pool_size = 10
+
+# Timeout in seconds before idle sql connections are reaped
+# idle_timeout = 3600
+
+# If set, use this value for max_overflow with sqlalchemy
+# max_overflow = 20
+
+# Verbosity of SQL debugging information. 0=None, 100=Everything
+# connection_debug = 0
+
+# Add python stack traces to SQL as comment strings
+# connection_trace = False
+
+# If set, use this value for pool_timeout with sqlalchemy
+# pool_timeout = 10
+
+[oslo_concurrency]
+
+# Directory to use for lock files. For security, the specified directory should
+# only be writable by the user running the processes that need locking.
+# Defaults to environment variable OSLO_LOCK_PATH. If external locks are used,
+# a lock path must be set.
+lock_path = $state_path/lock
+
+# Enables or disables inter-process locks.
+# disable_process_locking = False
+
+[oslo_messaging_amqp]
+
+#
+# From oslo.messaging
+#
+
+# Address prefix used when sending to a specific server (string value)
+# Deprecated group/name - [amqp1]/server_request_prefix
+# server_request_prefix = exclusive
+
+# Address prefix used when broadcasting to all servers (string value)
+# Deprecated group/name - [amqp1]/broadcast_prefix
+# broadcast_prefix = broadcast
+
+# Address prefix when sending to any server in group (string value)
+# Deprecated group/name - [amqp1]/group_request_prefix
+# group_request_prefix = unicast
+
+# Name for the AMQP container (string value)
+# Deprecated group/name - [amqp1]/container_name
+# container_name =
+
+# Timeout for inactive connections (in seconds) (integer value)
+# Deprecated group/name - [amqp1]/idle_timeout
+# idle_timeout = 0
+
+# Debug: dump AMQP frames to stdout (boolean value)
+# Deprecated group/name - [amqp1]/trace
+# trace = false
+
+# CA certificate PEM file for verifing server certificate (string value)
+# Deprecated group/name - [amqp1]/ssl_ca_file
+# ssl_ca_file =
+
+# Identifying certificate PEM file to present to clients (string value)
+# Deprecated group/name - [amqp1]/ssl_cert_file
+# ssl_cert_file =
+
+# Private key PEM file used to sign cert_file certificate (string value)
+# Deprecated group/name - [amqp1]/ssl_key_file
+# ssl_key_file =
+
+# Password for decrypting ssl_key_file (if encrypted) (string value)
+# Deprecated group/name - [amqp1]/ssl_key_password
+# ssl_key_password =
+
+# Accept clients using either SSL or plain TCP (boolean value)
+# Deprecated group/name - [amqp1]/allow_insecure_clients
+# allow_insecure_clients = false
+
+
+[oslo_messaging_qpid]
+
+#
+# From oslo.messaging
+#
+
+# Use durable queues in AMQP. (boolean value)
+# Deprecated group/name - [DEFAULT]/rabbit_durable_queues
+# amqp_durable_queues = false
+
+# Auto-delete queues in AMQP. (boolean value)
+# Deprecated group/name - [DEFAULT]/amqp_auto_delete
+# amqp_auto_delete = false
+
+# Size of RPC connection pool. (integer value)
+# Deprecated group/name - [DEFAULT]/rpc_conn_pool_size
+# rpc_conn_pool_size = 30
+
+# Qpid broker hostname. (string value)
+# Deprecated group/name - [DEFAULT]/qpid_hostname
+# qpid_hostname = localhost
+
+# Qpid broker port. (integer value)
+# Deprecated group/name - [DEFAULT]/qpid_port
+# qpid_port = 5672
+
+# Qpid HA cluster host:port pairs. (list value)
+# Deprecated group/name - [DEFAULT]/qpid_hosts
+# qpid_hosts = $qpid_hostname:$qpid_port
+
+# Username for Qpid connection. (string value)
+# Deprecated group/name - [DEFAULT]/qpid_username
+# qpid_username =
+
+# Password for Qpid connection. (string value)
+# Deprecated group/name - [DEFAULT]/qpid_password
+# qpid_password =
+
+# Space separated list of SASL mechanisms to use for auth. (string value)
+# Deprecated group/name - [DEFAULT]/qpid_sasl_mechanisms
+# qpid_sasl_mechanisms =
+
+# Seconds between connection keepalive heartbeats. (integer value)
+# Deprecated group/name - [DEFAULT]/qpid_heartbeat
+# qpid_heartbeat = 60
+
+# Transport to use, either 'tcp' or 'ssl'. (string value)
+# Deprecated group/name - [DEFAULT]/qpid_protocol
+# qpid_protocol = tcp
+
+# Whether to disable the Nagle algorithm. (boolean value)
+# Deprecated group/name - [DEFAULT]/qpid_tcp_nodelay
+# qpid_tcp_nodelay = true
+
+# The number of prefetched messages held by receiver. (integer value)
+# Deprecated group/name - [DEFAULT]/qpid_receiver_capacity
+# qpid_receiver_capacity = 1
+
+# The qpid topology version to use.  Version 1 is what was originally used by
+# impl_qpid.  Version 2 includes some backwards-incompatible changes that allow
+# broker federation to work.  Users should update to version 2 when they are
+# able to take everything down, as it requires a clean break. (integer value)
+# Deprecated group/name - [DEFAULT]/qpid_topology_version
+# qpid_topology_version = 1
+
+
+[oslo_messaging_rabbit]
+
+#
+# From oslo.messaging
+#
+
+# Use durable queues in AMQP. (boolean value)
+# Deprecated group/name - [DEFAULT]/rabbit_durable_queues
+# amqp_durable_queues = false
+
+# Auto-delete queues in AMQP. (boolean value)
+# Deprecated group/name - [DEFAULT]/amqp_auto_delete
+# amqp_auto_delete = false
+
+# Size of RPC connection pool. (integer value)
+# Deprecated group/name - [DEFAULT]/rpc_conn_pool_size
+# rpc_conn_pool_size = 30
+
+# SSL version to use (valid only if SSL enabled). Valid values are TLSv1 and
+# SSLv23. SSLv2, SSLv3, TLSv1_1, and TLSv1_2 may be available on some
+# distributions. (string value)
+# Deprecated group/name - [DEFAULT]/kombu_ssl_version
+# kombu_ssl_version =
+
+# SSL key file (valid only if SSL enabled). (string value)
+# Deprecated group/name - [DEFAULT]/kombu_ssl_keyfile
+# kombu_ssl_keyfile =
+
+# SSL cert file (valid only if SSL enabled). (string value)
+# Deprecated group/name - [DEFAULT]/kombu_ssl_certfile
+# kombu_ssl_certfile =
+
+# SSL certification authority file (valid only if SSL enabled). (string value)
+# Deprecated group/name - [DEFAULT]/kombu_ssl_ca_certs
+# kombu_ssl_ca_certs =
+
+# How long to wait before reconnecting in response to an AMQP consumer cancel
+# notification. (floating point value)
+# Deprecated group/name - [DEFAULT]/kombu_reconnect_delay
+# kombu_reconnect_delay = 1.0
+
+# The RabbitMQ broker address where a single node is used. (string value)
+# Deprecated group/name - [DEFAULT]/rabbit_host
+# rabbit_host = localhost
+
+# The RabbitMQ broker port where a single node is used. (integer value)
+# Deprecated group/name - [DEFAULT]/rabbit_port
+# rabbit_port = 5672
+
+# RabbitMQ HA cluster host:port pairs. (list value)
+# Deprecated group/name - [DEFAULT]/rabbit_hosts
+# rabbit_hosts = $rabbit_host:$rabbit_port
+
+# Connect over SSL for RabbitMQ. (boolean value)
+# Deprecated group/name - [DEFAULT]/rabbit_use_ssl
+# rabbit_use_ssl = false
+
+# The RabbitMQ userid. (string value)
+# Deprecated group/name - [DEFAULT]/rabbit_userid
+# rabbit_userid = guest
+
+# The RabbitMQ password. (string value)
+# Deprecated group/name - [DEFAULT]/rabbit_password
+# rabbit_password = guest
+
+# The RabbitMQ login method. (string value)
+# Deprecated group/name - [DEFAULT]/rabbit_login_method
+# rabbit_login_method = AMQPLAIN
+
+# The RabbitMQ virtual host. (string value)
+# Deprecated group/name - [DEFAULT]/rabbit_virtual_host
+# rabbit_virtual_host = /
+
+# How frequently to retry connecting with RabbitMQ. (integer value)
+# rabbit_retry_interval = 1
+
+# How long to backoff for between retries when connecting to RabbitMQ. (integer
+# value)
+# Deprecated group/name - [DEFAULT]/rabbit_retry_backoff
+# rabbit_retry_backoff = 2
+
+# Maximum number of RabbitMQ connection retries. Default is 0 (infinite retry
+# count). (integer value)
+# Deprecated group/name - [DEFAULT]/rabbit_max_retries
+# rabbit_max_retries = 0
+
+# Use HA queues in RabbitMQ (x-ha-policy: all). If you change this option, you
+# must wipe the RabbitMQ database. (boolean value)
+# Deprecated group/name - [DEFAULT]/rabbit_ha_queues
+# rabbit_ha_queues = false
+
+# Deprecated, use rpc_backend=kombu+memory or rpc_backend=fake (boolean value)
+# Deprecated group/name - [DEFAULT]/fake_rabbit
+# fake_rabbit = false
diff --git a/tricircle/cascade_service/__init__.py b/tricircle/cascade_service/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tricircle/cascade_service/endpoints/__init__.py b/tricircle/cascade_service/endpoints/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tricircle/cascade_service/endpoints/networking.py b/tricircle/cascade_service/endpoints/networking.py
new file mode 100644
index 00000000..0bf5cd15
--- /dev/null
+++ b/tricircle/cascade_service/endpoints/networking.py
@@ -0,0 +1,52 @@
+# Copyright 2015 Huawei Technologies Co., Ltd.
+#
+# 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 oslo_messaging
+
+from oslo_log import log as logging
+
+LOG = logging.getLogger(__name__)
+
+
+class CascadeNetworkingServiceEndpoint(object):
+
+    target = oslo_messaging.Target(namespace="networking",
+                                   version='1.0')
+
+    def create_network(self, ctx, payload):
+        # TODO(gamepl, saggi): STUB
+        LOG.info("(create_network) payload: %s", payload)
+        return True
+
+    def delete_network(self, ctx, payload):
+        # TODO(gampel, saggi): STUB
+        LOG.info("(delete_network) payload: %s", payload)
+        return True
+
+    def update_network(self, ctx, payload):
+        # TODO(gampel, saggi): STUB
+        LOG.info("(update_network) payload: %s", payload)
+        return True
+
+    def create_port(self, ctx, payload):
+        # TODO(gampel, saggi): STUB
+        LOG.info("(create_port) payload: %s", payload)
+        return True
+
+    def delete_port(self, ctx, payload):
+        # TODO(gampel, saggi): STUB
+        LOG.info("(delete_port) payload: %s", payload)
+        return True
diff --git a/tricircle/cascade_service/service.py b/tricircle/cascade_service/service.py
new file mode 100644
index 00000000..ce1a184d
--- /dev/null
+++ b/tricircle/cascade_service/service.py
@@ -0,0 +1,65 @@
+# Copyright 2015 Huawei Technologies Co., Ltd.
+#
+# 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.
+
+
+from socket import gethostname
+
+from oslo_config import cfg
+from oslo_log import log as logging
+import oslo_messaging
+
+from tricircle.common import topics
+from tricircle.common.serializer import CascadeSerializer as Serializer
+
+# import endpoints here
+from tricircle.cascade_service.endpoints.networking import (
+    CascadeNetworkingServiceEndpoint)
+
+LOG = logging.getLogger(__name__)
+
+
+class ServerControlEndpoint(object):
+    target = oslo_messaging.Target(namespace='control',
+                                   version='1.0')
+
+    def __init__(self, server):
+        self.server = server
+
+    def stop(self, ctx):
+        if self.server:
+            self.server.stop()
+
+
+def setup_server():
+    transport = oslo_messaging.get_transport(cfg.CONF)
+    target = oslo_messaging.Target(
+        exchange="tricircle",
+        topic=topics.CASCADING_SERVICE,
+        server=gethostname(),
+    )
+    server_control_endpoint = ServerControlEndpoint(None)
+    endpoints = [
+        server_control_endpoint,
+        CascadeNetworkingServiceEndpoint(),
+    ]
+    server = oslo_messaging.get_rpc_server(
+        transport,
+        target,
+        endpoints,
+        executor='eventlet',
+        serializer=Serializer(),
+    )
+    server_control_endpoint.server = server
+    return server
diff --git a/tricircle/common/__init__.py b/tricircle/common/__init__.py
new file mode 100644
index 00000000..e69de29b