Fix to get all port related attributes from config_db (sonic-net#362)

config/main.py

@@ -16,7 +16,7 @@
 import aaa
 import mlnx
 
-SONIC_CFGGEN_PATH = "sonic-cfggen"
+SONIC_CFGGEN_PATH = '/usr/local/bin/sonic-cfggen'
 
 #
 # Helper functions
@@ -42,13 +42,14 @@ def run_command(command, display_cmd=False, ignore_error=False):
 def interface_alias_to_name(interface_alias):
     """Return default interface name if alias name is given as argument
     """
-
-    cmd = 'sonic-cfggen -d --var-json "PORT"'
-    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
-
-    port_dict = json.loads(p.stdout.read())
+    config_db = ConfigDBConnector()
+    config_db.connect()
+    port_dict = config_db.get_table('PORT')
 
     if interface_alias is not None:
+        if not port_dict:
+            click.echo("port_dict is None!")
+            raise click.Abort()
         for port_name in natsorted(port_dict.keys()):
             if interface_alias == port_dict[port_name]['alias']:
                 return port_name
@@ -60,13 +61,14 @@ def interface_alias_to_name(interface_alias):
 def interface_name_to_alias(interface_name):
     """Return alias interface name if default name is given as argument
     """
-
-    cmd = 'sonic-cfggen -d --var-json "PORT"'
-    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
-
-    port_dict = json.loads(p.stdout.read())
+    config_db = ConfigDBConnector()
+    config_db.connect()
+    port_dict = config_db.get_table('PORT')
 
     if interface_name is not None:
+        if not port_dict:
+            click.echo("port_dict is None!")
+            raise click.Abort()
         for port_name in natsorted(port_dict.keys()):
             if interface_name == port_name:
                 return port_dict[port_name]['alias']

show/main.py

@@ -18,6 +18,8 @@
 
 import mlnx
 
+SONIC_CFGGEN_PATH = '/usr/local/bin/sonic-cfggen'
+
 try:
     # noinspection PyPep8Naming
     import ConfigParser as configparser
@@ -43,15 +45,19 @@ def read_config(self, filename):
         except configparser.NoSectionError:
             pass
 
-
 class InterfaceAliasConverter(object):
     """Class which handles conversion between interface name and alias"""
 
     def __init__(self):
         self.alias_max_length = 0
-        cmd = 'sonic-cfggen -d --var-json "PORT"'
-        p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
-        self.port_dict = json.loads(p.stdout.read())
+
+        config_db = ConfigDBConnector()
+        config_db.connect()
+        self.port_dict = config_db.get_table('PORT')
+
+        if not self.port_dict:
+            click.echo("port_dict is None!")
+            raise click.Abort()
 
         for port_name in self.port_dict.keys():
             if self.alias_max_length < len(