Framework: Telemetry retake

[csit.git] / resources / tools / telemetry / parser.py

diff --git a/resources/tools/telemetry/parser.py b/resources/tools/telemetry/parser.py
new file mode 100644 (file)
index 0000000..c6cc167
--- /dev/null
+++ b/resources/tools/telemetry/parser.py
@@ -0,0 +1,107 @@
+# Copyright (c) 2021 Cisco and/or its affiliates.
+# 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.
+
+"""Configuration parsing library."""
+
+from logging import getLogger
+from pathlib import Path
+import sys
+
+from yaml import safe_load, YAMLError
+
+
+class Parser:
+    """
+    Parser class reponsible for loading configuration.
+    """
+    def __init__(self, configuration_file):
+        """
+        Config Parser init.
+
+        :param configuration_file: Telemetry configuration file path.
+        :type configuration_file: str
+        """
+        self.instance = None
+        self.config = None
+        self.suffix = Path(configuration_file).suffix[1:].capitalize()
+
+        try:
+            self.instance = globals()[self.suffix+"Loader"](configuration_file)
+        except KeyError:
+            raise ParserError(u"Unsupported file format!")
+
+        self.config = FileLoader(self.instance).load()
+
+
+class FileLoader:
+    """
+    Creates a File Loader object. This is the main object for interacting
+    with configuration file.
+    """
+    def __init__(self, loader):
+        """
+        File Loader class init.
+
+        :param loader: Loader object responsible for handling file type.
+        :type loader: obj
+        """
+        self.loader = loader
+
+    def load(self):
+        """
+        File format parser.
+        """
+        return self.loader.load()
+
+
+class YamlLoader:
+    """
+    Creates a YAML Loader object. This is the main object for interacting
+    with YAML file.
+    """
+    def __init__(self, configuration_file):
+        """
+        YAML Loader class init.
+
+        :param configuration_file: YAML configuration file path.
+        :type configuration_file: str
+        """
+        self.configuration_file = configuration_file
+
+    def load(self):
+        """
+        YAML format parser.
+        """
+        with open(self.configuration_file, u"r") as stream:
+            try:
+                return safe_load(stream)
+            except YAMLError as exc:
+                raise ParserError(str(exc))
+
+
+class ParserError(Exception):
+    """
+    Creates a Parser Error Exception. This exception is supposed to handle
+    all the errors raised during processing.
+    """
+    def __init__(self, message):
+        """
+        Parser Error Excpetion init.
+
+        :param message: Exception error message.
+        :type message: str
+        """
+        super().__init__()
+        self.message = message
+        getLogger(__name__).error(self.message)
+        sys.exit(1)