Add OTI event-handler project

OTI event handler application in DCAEGEN2 platform

Change-Id: Ie64f26f851e2045f00043f90279d503c2dc62948
Issue-ID: DCAEGEN2-1910
Signed-off-by: Kotagiri, Ramprasad (rp5662) <rp5662@att.com>

1 files changed, 179 insertions, 0 deletions

diff --git a/oti/event-handler/otihandler/config.py b/oti/event-handler/otihandler/config.py
new file mode 100644
index 0000000..d5149cc
--- /dev/null
+++ b/oti/event-handler/otihandler/config.py
@@ -0,0 +1,179 @@
+# ================================================================================
+# Copyright (c) 2019-2020 AT&T Intellectual Property. All rights reserved.
+# ================================================================================
+# 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.
+# ============LICENSE_END=========================================================
+
+"""read and use the config"""
+
+import copy
+import json
+import logging
+import logging.config
+import os
+
+from otihandler.consul_client import ConsulClient
+
+logging.basicConfig(
+    filename='logs/oti_handler.log', \
+    format='%(asctime)s.%(msecs)03d %(levelname)+8s ' + \
+           '%(threadName)s %(name)s.%(funcName)s: %(message)s', \
+    datefmt='%Y%m%d_%H%M%S', level=logging.DEBUG)
+
+class Config(object):
+    """main config of the application"""
+
+    CONFIG_FILE_PATH = "etc/config.json"
+    LOGGER_CONFIG_FILE_PATH = "etc/common_logger.config"
+    SERVICE_NAME = "oti_handler"
+
+    FIELD_SYSTEM = "system"
+    FIELD_WSERVICE_PORT = "wservice_port"
+    FIELD_TLS = "tls"
+
+    _logger = logging.getLogger("oti_handler.config")
+    config = None
+
+    cloudify_proto = None
+    cloudify_addr = None
+    cloudify_port = None
+    cloudify_user = None
+    cloudify_pass = None
+    cloudify = None
+    consul_url = "http://consul:8500"
+    tls_cacert_file = None
+    tls_server_cert_file = None
+    tls_private_key_file = None
+    tls_server_ca_chain_file = None
+    wservice_port = 9443
+
+    @staticmethod
+    def _get_tls_file_path(tls_config, cert_directory, tls_name):
+        """calc file path and verify its existance"""
+
+        file_name = tls_config.get(tls_name)
+        if not file_name:
+            return None
+        tls_file_path = os.path.join(cert_directory, file_name)
+        if not os.path.isfile(tls_file_path) or not os.access(tls_file_path, os.R_OK):
+            Config._logger.error("invalid %s: %s", tls_name, tls_file_path)
+            return None
+        return tls_file_path
+
+    @staticmethod
+    def _set_tls_config(tls_config):
+        """verify and set tls certs in config"""
+
+        try:
+            Config.tls_cacert_file = None
+            Config.tls_server_cert_file = None
+            Config.tls_private_key_file = None
+            Config.tls_server_ca_chain_file = None
+
+            if not (tls_config and isinstance(tls_config, dict)):
+                Config._logger.info("no tls in config: %s", json.dumps(tls_config))
+                return
+
+            cert_directory = tls_config.get("cert_directory")
+
+            if not (cert_directory and isinstance(cert_directory, str)):
+                Config._logger.warning("unexpected tls.cert_directory: %r", cert_directory)
+                return
+
+            cert_directory = os.path.join(
+                os.path.dirname(os.path.dirname(os.path.realpath(__file__))), str(cert_directory))
+            if not (cert_directory and os.path.isdir(cert_directory)):
+                Config._logger.warning("ignoring invalid cert_directory: %s", cert_directory)
+                return
+
+            Config.tls_cacert_file = Config._get_tls_file_path(tls_config, cert_directory, "cacert")
+            Config.tls_server_cert_file = Config._get_tls_file_path(tls_config, cert_directory,
+                                                                    "server_cert")
+            Config.tls_private_key_file = Config._get_tls_file_path(tls_config, cert_directory,
+                                                                    "private_key")
+            Config.tls_server_ca_chain_file = Config._get_tls_file_path(tls_config, cert_directory,
+                                                                        "server_ca_chain")
+
+        finally:
+            Config._logger.info("tls_cacert_file = %s", Config.tls_cacert_file)
+            Config._logger.info("tls_server_cert_file = %s", Config.tls_server_cert_file)
+            Config._logger.info("tls_private_key_file = %s", Config.tls_private_key_file)
+            Config._logger.info("tls_server_ca_chain_file = %s", Config.tls_server_ca_chain_file)
+
+    @staticmethod
+    def merge(new_config):
+        """merge the new_config into current config - override the values"""
+
+        if not new_config:
+            return
+
+        if not Config.config:
+            Config.config = new_config
+            return
+
+        new_config = copy.deepcopy(new_config)
+        Config.config.update(new_config)
+
+    @staticmethod
+    def get_system_name():
+        """find the name of the oti_handler system
+        to be used as the key in consul-kv for config of oti_handler
+        """
+
+        return (Config.config or {}).get(Config.FIELD_SYSTEM, Config.SERVICE_NAME)
+
+    @staticmethod
+    def discover():
+        """bring and merge the config settings from Consul"""
+
+        system_key = Config.get_system_name()
+        new_config = ConsulClient.get_value(system_key)
+
+        if not new_config or not isinstance(new_config, dict):
+            Config._logger.warn("unexpected config from Consul: %s", new_config)
+            return
+
+        Config._logger.debug("loaded config from Consul(%s): %s",
+            system_key, json.dumps(new_config))
+        Config._logger.debug("config before merge from Consul: %s", json.dumps(Config.config))
+        Config.merge(new_config.get(Config.SERVICE_NAME))
+        Config._logger.debug("merged config from Consul: %s", json.dumps(Config.config))
+
+    @staticmethod
+    def load_from_file(file_path=None):
+        """read and store the config from config file"""
+
+        if not file_path:
+            file_path = Config.CONFIG_FILE_PATH
+
+        loaded_config = None
+        if os.access(file_path, os.R_OK):
+            with open(file_path, 'r') as config_json:
+                loaded_config = json.load(config_json)
+
+        if not loaded_config:
+            Config._logger.info("config not loaded from file: %s", file_path)
+            return
+
+        Config._logger.info("config loaded from file: %s", file_path)
+        logging_config = loaded_config.get("logging")
+        if logging_config:
+            logging.config.dictConfig(logging_config)
+
+        Config.wservice_port = loaded_config.get(Config.FIELD_WSERVICE_PORT, Config.wservice_port)
+
+        local_config = loaded_config.get(Config.SERVICE_NAME, {})
+        Config._set_tls_config(local_config.get(Config.FIELD_TLS))
+
+        Config.merge(loaded_config.get(Config.SERVICE_NAME))
+        return True