[sonic_py_common][device info] APIs to return chassis type (voq or packet) (#9227)

src/sonic-py-common/sonic_py_common/device_info.py

@@ -210,6 +210,7 @@ def get_path_to_platform_dir():
 
     return platform_path
 
+
 def get_path_to_hwsku_dir():
     """
     Retreives the path to the device's hardware SKU data directory
@@ -228,6 +229,7 @@ def get_path_to_hwsku_dir():
 
     return hwsku_path
 
+
 def get_paths_to_platform_and_hwsku_dirs():
     """
     Retreives the paths to the device's platform and hardware SKU data
@@ -249,6 +251,7 @@ def get_paths_to_platform_and_hwsku_dirs():
 
     return (platform_path, hwsku_path)
 
+
 def get_path_to_port_config_file(hwsku=None, asic=None):
     """
     Retrieves the path to the device's port configuration file
@@ -351,6 +354,17 @@ def get_platform_info():
     hw_info_dict['asic_type'] = version_info['asic_type']
     hw_info_dict['asic_count'] = get_num_asics()
 
+    try:
+        config_db = ConfigDBConnector()
+        config_db.connect()
+
+        metadata = config_db.get_table('DEVICE_METADATA')["localhost"]
+        switch_type = metadata.get('switch_type')
+        if switch_type:
+            hw_info_dict['switch_type'] = switch_type
+    except Exception:
+        pass
+
     return hw_info_dict
 
 
@@ -398,6 +412,20 @@ def is_multi_npu():
     return (num_npus > 1)
 
 
+def is_voq_chassis():
+    switch_type = get_platform_info().get('switch_type')
+    return True if switch_type and switch_type == 'voq' else False
+
+
+def is_packet_chassis():
+    switch_type = get_platform_info().get('switch_type')
+    return True if switch_type and switch_type == 'chassis-packet' else False
+
+
+def is_chassis():
+    return is_voq_chassis() or is_packet_chassis()
+
+
 def is_supervisor():
     platform_env_conf_file_path = get_platform_env_conf_file_path()
     if platform_env_conf_file_path is None:
@@ -550,6 +578,7 @@ def get_system_routing_stack():
 
     return result
 
+
 # Check if System warm reboot or Container warm restart is enabled.
 def is_warm_restart_enabled(container_name):
     state_db = SonicV2Connector(host='127.0.0.1')
@@ -571,6 +600,7 @@ def is_warm_restart_enabled(container_name):
     state_db.close(state_db.STATE_DB)
     return wr_enable_state
 
+
 # Check if System fast reboot is enabled.
 def is_fast_reboot_enabled():
     fb_system_state = 0