text: # Copyright 2018 The Kubernetes Authors.
  #
  # 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.
  
  
  import re
  from os import path
  
  import yaml
  
  from kubernetes_asyncio import client
  
  
  async def create_from_yaml(
          k8s_client,
          yaml_file,
          verbose=False,
          namespace="default",
          **kwargs):
      """
      Perform an action from a yaml file. Pass True for verbose to
      print confirmation information.
      Input:
      yaml_file: string. Contains the path to yaml file.
      k8s_client: an ApiClient object, initialized with the client args.
      verbose: If True, print confirmation from the create action.
          Default is False.
      namespace: string. Contains the namespace to create all
          resources inside. The namespace must preexist otherwise
          the resource creation will fail. If the API object in
          the yaml file already contains a namespace definition
          this parameter has no effect.
      Returns:
      An k8s api object or list of apis objects created from YAML.
      When a single object is generated, return type is dependent
      on output_list.
      Throws a FailToCreateError exception if creation of any object
      fails with helpful messages from the server.
      Available parameters for creating <kind>:
      :param async_req bool
      :param bool include_uninitialized: If true, partially initialized
          resources are included in the response.
      :param str pretty: If 'true', then the output is pretty printed.
      :param str dry_run: When present, indicates that modifications
          should not be persisted. An invalid or unrecognized dryRun
          directive will result in an error response and no further
          processing of the request.
          Valid values are: - All: all dry run stages will be processed
      """
  
      with open(path.abspath(yaml_file)) as f:
          yml_document_all = yaml.safe_load_all(f)
          api_exceptions = []
          # Load all documents from a single YAML file
          for yml_document in yml_document_all:
              # If it is a list type, will need to iterate its items
              if "List" in yml_document["kind"]:
                  # Could be "List" or "Pod/Service/...List"
                  # This is a list type. iterate within its items
                  kind = yml_document["kind"].replace("List", "")
                  for yml_object in yml_document["items"]:
                      # Mitigate cases when server returns a xxxList object
                      # See kubernetes-client/python#586
                      if kind is not "":
                          yml_object["apiVersion"] = yml_document["apiVersion"]
                          yml_object["kind"] = kind
                      try:
                          await create_from_yaml_single_item(
                              k8s_client, yml_object, verbose, namespace, **kwargs)
                      except client.rest.ApiException as api_exception:
                          api_exceptions.append(api_exception)
              else:
                  # This is a single object. Call the single item method
                  try:
                      await create_from_yaml_single_item(
                          k8s_client, yml_document, verbose, namespace, **kwargs)
                  except client.rest.ApiException as api_exception:
                      api_exceptions.append(api_exception)
      # In case we have exceptions waiting for us, raise them
      if api_exceptions:
          raise FailToCreateError(api_exceptions)
  
  
  async def create_from_yaml_single_item(
          k8s_client,
          yml_object,
          verbose=False,
          namespace="default",
          **kwargs):
      group, _, version = yml_object["apiVersion"].partition("/")
      if version == "":
          version = group
          group = "core"
      # Take care for the case e.g. api_type is "apiextensions.k8s.io"
      # Only replace the last instance
      group = "".join(group.rsplit(".k8s.io", 1))
      # convert group name from DNS subdomain format to
      # python class name convention
      group = "".join(word.capitalize() for word in group.split('.'))
      fcn_to_call = "{0}{1}Api".format(group, version.capitalize())
      k8s_api = getattr(client, fcn_to_call)(k8s_client)
      # Replace CamelCased action_type into snake_case
      kind = yml_object["kind"]
      kind = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', kind)
      kind = re.sub('([a-z0-9])([A-Z])', r'\1_\2', kind).lower()
      # Decide which namespace we are going to put the object in,
      # if any
      if "namespace" in yml_object["metadata"]:
          namespace = yml_object["metadata"]["namespace"]
      # Expect the user to create namespaced objects more often
      if hasattr(k8s_api, "create_namespaced_{0}".format(kind)):
          resp = await getattr(k8s_api, "create_namespaced_{0}".format(kind))(
              body=yml_object, namespace=namespace, **kwargs)
      else:
          resp = await getattr(k8s_api, "create_{0}".format(kind))(
              body=yml_object, **kwargs)
      if verbose:
          print("{0} created. status='{1}'".format(kind, str(resp.status)))
  
  
  class FailToCreateError(Exception):
      """
      An exception class for handling error if an error occurred when
      handling a yaml file.
      """
  
      def __init__(self, api_exceptions):
          self.api_exceptions = api_exceptions
  
      def __str__(self):
          msg = ""
          for api_exception in self.api_exceptions:
              msg += "Error from server ({0}): {1}".format(
                  api_exception.reason, api_exception.body)
          return msg
  