Add function to load YAML files

This commit starts to remove some code redundancy from the startup
scripts for easier maintenance.

startup_scripts/000_users.py

@@ -1,19 +1,14 @@
 from django.contrib.auth.models import Permission, Group, User
 from users.models import Token
 
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/users.yml')
-if not file.is_file():
+users = load_yaml('/opt/netbox/initializers/users.yml')
+
+if users is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml=YAML(typ='safe')
-  users = yaml.load(stream)
-
-  if users is not None:
 for username, user_details in users.items():
   if not User.objects.filter(username=username):
     user = User.objects.create_user(

startup_scripts/010_groups.py

@@ -1,17 +1,11 @@
 from django.contrib.auth.models import Permission, Group, User
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/groups.yml')
-if not file.is_file():
+groups = load_yaml('/opt/netbox/initializers/groups.yml')
+if groups is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml=YAML(typ='safe')
-  groups = yaml.load(stream)
-
-  if groups is not None:
 for groupname, group_details in groups.items():
   group, created = Group.objects.get_or_create(name=groupname)
 

startup_scripts/020_custom_fields.py

@@ -1,7 +1,6 @@
 from extras.models import CustomField, CustomFieldChoice
 
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
 def get_class_for_class_path(class_path):
@@ -13,15 +12,11 @@ def get_class_for_class_path(class_path):
   clazz = getattr(module, class_name)
   return ContentType.objects.get_for_model(clazz)
 
-file = Path('/opt/netbox/initializers/custom_fields.yml')
-if not file.is_file():
+customfields = load_yaml('/opt/netbox/initializers/custom_fields.yml')
+
+if customfields is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  customfields = yaml.load(stream)
-
-  if customfields is not None:
 for cf_name, cf_details in customfields.items():
   custom_field, created = CustomField.objects.get_or_create(name = cf_name)
 

startup_scripts/030_regions.py

@@ -1,21 +1,16 @@
 from dcim.models import Region
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/regions.yml')
-if not file.is_file():
-  sys.exit()
+regions = load_yaml('/opt/netbox/initializers/regions.yml')
 
-with file.open('r') as stream:
-  yaml=YAML(typ='safe')
-  regions = yaml.load(stream)
+if regions is None:
+  sys.exit()
 
 optional_assocs = {
   'parent': (Region, 'name')
 }
 
-  if regions is not None:
 for params in regions:
 
   for assoc, details in optional_assocs.items():

startup_scripts/040_sites.py

@@ -1,24 +1,19 @@
 from dcim.models import Region, Site
 from extras.models import CustomField, CustomFieldValue
 from tenancy.models import Tenant
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/sites.yml')
-if not file.is_file():
-  sys.exit()
+sites = load_yaml('/opt/netbox/initializers/sites.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  sites = yaml.load(stream)
+if sites is None:
+  sys.exit()
 
 optional_assocs = {
   'region': (Region, 'name'),
   'tenant': (Tenant, 'name')
 }
 
-  if sites is not None:
 for params in sites:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/050_manufacturers.py

@@ -1,17 +1,12 @@
 from dcim.models import Manufacturer
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/manufacturers.yml')
-if not file.is_file():
+manufacturers = load_yaml('/opt/netbox/initializers/manufacturers.yml')
+
+if manufacturers is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  manufacturers = yaml.load(stream)
-
-  if manufacturers is not None:
 for params in manufacturers:
   manufacturer, created = Manufacturer.objects.get_or_create(**params)
 

startup_scripts/060_device_types.py

@@ -1,17 +1,13 @@
 from dcim.models import DeviceType, Manufacturer, Region
 from tenancy.models import Tenant
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/device_types.yml')
-if not file.is_file():
-  sys.exit()
+device_types = load_yaml('/opt/netbox/initializers/device_types.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  device_types = yaml.load(stream)
+if device_types is None:
+  sys.exit()
 
 required_assocs = {
   'manufacturer': (Manufacturer, 'name')
@@ -22,7 +18,6 @@ with file.open('r') as stream:
   'tenant': (Tenant, 'name')
 }
 
-  if device_types is not None:
 for params in device_types:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/070_rack_roles.py

@@ -1,19 +1,14 @@
 from dcim.models import RackRole
-from ruamel.yaml import YAML
 from utilities.forms import COLOR_CHOICES
 
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/rack_roles.yml')
-if not file.is_file():
+rack_roles = load_yaml('/opt/netbox/initializers/rack_roles.yml')
+
+if rack_roles is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml=YAML(typ='safe')
-  rack_roles = yaml.load(stream)
-
-  if rack_roles is not None:
 for params in rack_roles:
   if 'color' in params:
     color = params.pop('color')

startup_scripts/075_rack_groups.py

@@ -1,22 +1,16 @@
 from dcim.models import Site,RackGroup
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/rack_groups.yml')
-if not file.is_file():
-  sys.exit()
+rack_groups = load_yaml('/opt/netbox/initializers/rack_groups.yml')
 
-with file.open('r') as stream:
-  yaml=YAML(typ='safe')
-  rack_groups= yaml.load(stream)
+if rack_groups is None:
+  sys.exit()
 
 required_assocs = {
   'site': (Site, 'name')
 }
 
-  if rack_groups is not None:
 for params in rack_groups:
 
   for assoc, details in required_assocs.items():

startup_scripts/080_racks.py

@@ -1,17 +1,13 @@
 from dcim.models import Site, RackRole, Rack, RackGroup
 from tenancy.models import Tenant
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/racks.yml')
-if not file.is_file():
-  sys.exit()
+racks = load_yaml('/opt/netbox/initializers/racks.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  racks = yaml.load(stream)
+if racks is None:
+  sys.exit()
 
 required_assocs = {
   'site': (Site, 'name')
@@ -23,7 +19,6 @@ with file.open('r') as stream:
   'group': (RackGroup, 'name')
 }
 
-  if racks is not None:
 for params in racks:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/090_device_roles.py

@@ -1,19 +1,13 @@
 from dcim.models import DeviceRole
-from ruamel.yaml import YAML
 from utilities.forms import COLOR_CHOICES
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/device_roles.yml')
-if not file.is_file():
+device_roles = load_yaml('/opt/netbox/initializers/device_roles.yml')
+
+if device_roles is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml=YAML(typ='safe')
-  device_roles = yaml.load(stream)
-
-  if device_roles is not None:
 for params in device_roles:
 
   if 'color' in params:

startup_scripts/100_platforms.py

@@ -1,22 +1,16 @@
 from dcim.models import Manufacturer, Platform
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/platforms.yml')
-if not file.is_file():
-  sys.exit()
+platforms = load_yaml('/opt/netbox/initializers/platforms.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  platforms = yaml.load(stream)
+if platforms is None:
+  sys.exit()
 
 optional_assocs = {
   'manufacturer': (Manufacturer, 'name'),
 }
 
-  if platforms is not None:
 for params in platforms:
 
   for assoc, details in optional_assocs.items():

startup_scripts/110_tenant_groups.py

@@ -1,17 +1,12 @@
 from tenancy.models import TenantGroup
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/tenant_groups.yml')
-if not file.is_file():
+tenant_groups = load_yaml('/opt/netbox/initializers/tenant_groups.yml')
+
+if tenant_groups is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  tenant_groups = yaml.load(stream)
-
-  if tenant_groups is not None:
 for params in tenant_groups:
   tenant_group, created = TenantGroup.objects.get_or_create(**params)
 

startup_scripts/120_tenants.py

@@ -1,23 +1,17 @@
 from tenancy.models import Tenant, TenantGroup
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/tenants.yml')
-if not file.is_file():
-  sys.exit()
+tenants = load_yaml('/opt/netbox/initializers/tenants.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  tenants = yaml.load(stream)
+if tenants is None:
+  sys.exit()
 
 optional_assocs = {
   'group': (TenantGroup, 'name')
 }
 
-  if tenants is not None:
 for params in tenants:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/130_devices.py

@@ -3,18 +3,13 @@ from ipam.models import IPAddress
 from virtualization.models import Cluster
 from tenancy.models import Tenant
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/devices.yml')
-if not file.is_file():
-  sys.exit()
+devices = load_yaml('/opt/netbox/initializers/devices.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  devices = yaml.load(stream)
+if devices is None:
+  sys.exit()
 
 required_assocs = {
   'device_role': (DeviceRole, 'name'),
@@ -31,7 +26,6 @@ with file.open('r') as stream:
   'primary_ip6': (IPAddress, 'address')
 }
 
-  if devices is not None:
 for params in devices:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/140_cluster_types.py

@@ -1,17 +1,12 @@
 from virtualization.models import ClusterType
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/cluster_types.yml')
-if not file.is_file():
+cluster_types = load_yaml('/opt/netbox/initializers/cluster_types.yml')
+
+if cluster_types is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  cluster_types = yaml.load(stream)
-
-  if cluster_types is not None:
 for params in cluster_types:
   cluster_type, created = ClusterType.objects.get_or_create(**params)
 

startup_scripts/150_rirs.py

@@ -1,17 +1,12 @@
 from ipam.models import RIR
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/rirs.yml')
-if not file.is_file():
+rirs = load_yaml('/opt/netbox/initializers/rirs.yml')
+
+if rirs is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  rirs = yaml.load(stream)
-
-  if rirs is not None:
 for params in rirs:
   rir, created = RIR.objects.get_or_create(**params)
 

startup_scripts/160_aggregates.py

@@ -1,24 +1,20 @@
 from ipam.models import Aggregate, RIR
-from ruamel.yaml import YAML
+
 from extras.models import CustomField, CustomFieldValue
 
 from netaddr import IPNetwork
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/aggregates.yml')
-if not file.is_file():
-  sys.exit()
+aggregates = load_yaml('/opt/netbox/initializers/aggregates.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  aggregates = yaml.load(stream)
+if aggregates is None:
+  sys.exit()
 
 required_assocs = {
   'rir': (RIR, 'name')
 }
 
-  if aggregates is not None:
 for params in aggregates:
   custom_fields = params.pop('custom_fields', None)
   params['prefix'] = IPNetwork(params['prefix'])

startup_scripts/170_clusters.py

@@ -1,18 +1,13 @@
 from dcim.models import Site
 from virtualization.models import Cluster, ClusterType, ClusterGroup
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/clusters.yml')
-if not file.is_file():
-  sys.exit()
+clusters = load_yaml('/opt/netbox/initializers/clusters.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  clusters = yaml.load(stream)
+if clusters is None:
+  sys.exit()
 
 required_assocs = {
   'type': (ClusterType, 'name')
@@ -23,7 +18,6 @@ with file.open('r') as stream:
   'group': (ClusterGroup, 'name')
 }
 
-  if clusters is not None:
 for params in clusters:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/180_vrfs.py

@@ -1,24 +1,20 @@
 from ipam.models import VRF
 from tenancy.models import Tenant
-from ruamel.yaml import YAML
+
 from extras.models import CustomField, CustomFieldValue
 
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/vrfs.yml')
-if not file.is_file():
-  sys.exit()
+vrfs = load_yaml('/opt/netbox/initializers/vrfs.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  vrfs = yaml.load(stream)
+if vrfs is None:
+  sys.exit()
 
 optional_assocs = {
   'tenant': (Tenant, 'name')
 }
 
-  if vrfs is not None:
 for params in vrfs:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/190_prefix_vlan_roles.py

@@ -1,17 +1,12 @@
 from ipam.models import Role
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/prefix_vlan_roles.yml')
-if not file.is_file():
+roles = load_yaml('/opt/netbox/initializers/prefix_vlan_roles.yml')
+
+if roles is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  roles = yaml.load(stream)
-
-  if roles is not None:
 for params in roles:
   role, created = Role.objects.get_or_create(**params)
 

startup_scripts/200_vlan_groups.py

@@ -1,24 +1,18 @@
 from dcim.models import Site
 from ipam.models import VLANGroup
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/vlan_groups.yml')
-if not file.is_file():
-  sys.exit()
+vlan_groups = load_yaml('/opt/netbox/initializers/vlan_groups.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  vlan_groups = yaml.load(stream)
+if vlan_groups is None:
+  sys.exit()
 
 optional_assocs = {
   'site': (Site, 'name')
 }
 
-  if vlan_groups is not None:
 for params in vlan_groups:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/210_vlans.py

@@ -2,18 +2,13 @@ from dcim.models import Site
 from ipam.models import VLAN, VLANGroup, Role
 from tenancy.models import Tenant, TenantGroup
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/vlans.yml')
-if not file.is_file():
-  sys.exit()
+vlans = load_yaml('/opt/netbox/initializers/vlans.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  vlans = yaml.load(stream)
+if vlans is None:
+  sys.exit()
 
 optional_assocs = {
   'site': (Site, 'name'),
@@ -23,7 +18,6 @@ with file.open('r') as stream:
   'role': (Role, 'name')
 }
 
-  if vlans is not None:
 for params in vlans:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/220_prefixes.py

@@ -2,19 +2,14 @@ from dcim.models import Site
 from ipam.models import Prefix, VLAN, Role, VRF
 from tenancy.models import Tenant, TenantGroup
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
 from netaddr import IPNetwork
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/prefixes.yml')
-if not file.is_file():
-  sys.exit()
+prefixes = load_yaml('/opt/netbox/initializers/prefixes.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  prefixes = yaml.load(stream)
+if prefixes is None:
+  sys.exit()
 
 optional_assocs = {
   'site': (Site, 'name'),
@@ -25,7 +20,6 @@ with file.open('r') as stream:
   'vrf': (VRF, 'name')
 }
 
-  if prefixes is not None:
 for params in prefixes:
   custom_fields = params.pop('custom_fields', None)
   params['prefix'] = IPNetwork(params['prefix'])
@@ -34,7 +28,6 @@ with file.open('r') as stream:
     if assoc in params:
       model, field = details
       query = { field: params.pop(assoc) }
-
       params[assoc] = model.objects.get(**query)
 
   prefix, created = Prefix.objects.get_or_create(**params)
@@ -48,7 +41,6 @@ with file.open('r') as stream:
           obj=prefix,
           value=cf_value
         )
-
         prefix.custom_field_values.add(custom_field_value)
 
     print("📌 Created Prefix", prefix.prefix)

startup_scripts/230_virtual_machines.py

@@ -2,18 +2,13 @@ from dcim.models import Site, Platform, DeviceRole
 from virtualization.models import Cluster, VirtualMachine
 from tenancy.models import Tenant
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/virtual_machines.yml')
-if not file.is_file():
-  sys.exit()
+virtual_machines = load_yaml('/opt/netbox/initializers/virtual_machines.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  virtual_machines = yaml.load(stream)
+if virtual_machines is None:
+  sys.exit()
 
 required_assocs = {
   'cluster': (Cluster, 'name')
@@ -25,7 +20,6 @@ with file.open('r') as stream:
   'role': (DeviceRole, 'name')
 }
 
-  if virtual_machines is not None:
 for params in virtual_machines:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/240_virtualization_interfaces.py

@@ -1,24 +1,18 @@
 from dcim.models import Interface
 from virtualization.models import VirtualMachine
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/virtualization_interfaces.yml')
-if not file.is_file():
-  sys.exit()
+interfaces = load_yaml('/opt/netbox/initializers/virtualization_interfaces.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  interfaces = yaml.load(stream)
+if interfaces is None:
+  sys.exit()
 
 required_assocs = {
   'virtual_machine': (VirtualMachine, 'name')
 }
 
-  if interfaces is not None:
 for params in interfaces:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/250_dcim_interfaces.py

@@ -1,23 +1,17 @@
 from dcim.models import Interface, Device
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
-
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/dcim_interfaces.yml')
-if not file.is_file():
-  sys.exit()
+interfaces= load_yaml('/opt/netbox/initializers/dcim_interfaces.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  interfaces = yaml.load(stream)
+if interfaces is None:
+  sys.exit()
 
 required_assocs = {
   'device': (Device, 'name')
 }
 
-  if interfaces is not None:
 for params in interfaces:
   custom_fields = params.pop('custom_fields', None)
 

startup_scripts/260_ip_addresses.py

@@ -3,19 +3,15 @@ from dcim.models import Device, Interface
 from virtualization.models import VirtualMachine
 from tenancy.models import Tenant
 from extras.models import CustomField, CustomFieldValue
-from ruamel.yaml import YAML
 
 from netaddr import IPNetwork
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/ip_addresses.yml')
-if not file.is_file():
-  sys.exit()
+ip_addresses = load_yaml('/opt/netbox/initializers/ip_addresses.yml')
 
-with file.open('r') as stream:
-  yaml = YAML(typ='safe')
-  ip_addresses = yaml.load(stream)
+if ip_addresses is None:
+  sys.exit()
 
 optional_assocs = {
   'tenant': (Tenant, 'name'),
@@ -23,7 +19,6 @@ with file.open('r') as stream:
   'interface': (Interface, 'name')
 }
 
-  if ip_addresses is not None:
 for params in ip_addresses:
   vm = params.pop('virtual_machine', None)
   device = params.pop('device', None)

startup_scripts/startup_script_utils/__init__.py

@@ -0,0 +1 @@
+from .load_yaml import load_yaml

startup_scripts/startup_script_utils/load_yaml.py

@@ -0,0 +1,10 @@
+from ruamel.yaml import YAML
+from pathlib import Path
+
+def load_yaml(yaml_file: str):
+  yf = Path(yaml_file)
+  if not yf.is_file():
+    return None
+  with yf.open("r") as stream:
+    yaml = YAML(typ="safe")
+    return yaml.load(stream)