text: # Licensed to Elasticsearch B.V. under one or more contributor
  # license agreements. See the NOTICE file distributed with
  # this work for additional information regarding copyright
  # ownership. Elasticsearch B.V. licenses this file to you 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.
  
  """Util functions."""
  
  import os
  import shutil
  import functools
  
  from contextlib import contextmanager
  from glob import glob
  from pathlib import Path
  from tempfile import mkdtemp
  from types import SimpleNamespace
  from urllib.parse import urlparse
  
  root_dir = os.path.abspath(os.path.join(os.path.split(__file__)[0], "..", ".."))
  
  
  @contextmanager
  def tempdir():
      tmpdir = mkdtemp()
      try:
          yield tmpdir
      finally:
          shutil.rmtree(tmpdir)
  
  
  @contextmanager
  def resource(uri, basedir=None):
      import requests
  
      with tempdir() as tmpdir:
          uri_parts = urlparse(uri)
          if uri_parts.scheme.startswith("http"):
              uri_file = uri_parts.path.split("/")[-1]
              local_file = os.path.join(tmpdir, uri_file)
              with open(local_file, "wb") as f:
                  f.write(requests.get(uri).content)
          elif uri_parts.scheme == "file":
              if uri_parts.netloc:
                  local_file = os.path.join(basedir or os.getcwd(), uri_parts.netloc + uri_parts.path)
              else:
                  local_file = uri_parts.path
          elif uri_parts.scheme == "":
              local_file = uri_parts.path
          else:
              raise ValueError(f"uri scheme not supported: {uri_parts.scheme}")
  
          if os.path.isdir(local_file):
              tmpdir = local_file
          else:
              shutil.unpack_archive(local_file, tmpdir)
              if uri_parts.scheme.startswith("http"):
                  os.unlink(local_file)
  
          yield tmpdir
  
  
  @functools.lru_cache
  def load_schema(uri, path, basedir=None):
      import yaml
  
      with resource(uri, basedir=basedir) as resource_dir:
          filenames = glob(os.path.join(resource_dir, "*", path), recursive=True)
          if len(filenames) < 1:
              raise ValueError(f"File not found in '{resource_dir}': '{path}'")
          if len(filenames) > 1:
              raise ValueError(f"Too many files: {filenames}")
  
          with open(filenames[0]) as f:
              return yaml.safe_load(f)
  
  
  @functools.lru_cache
  def load_rules(uri, paths, basedir=None):
      import pytoml
  
      if type(paths) == str:
          paths = (paths,)
  
      rules = []
      with resource(uri, basedir=basedir) as resource_dir:
          for path in paths:
              for filename in glob(os.path.join(resource_dir, "*", path), recursive=True):
                  with open(filename) as f:
                      rule = pytoml.load(f)["rule"]
                  rule["path"] = Path('.').joinpath(*Path(filename).relative_to(resource_dir).parts[1:])
                  rules.append(SimpleNamespace(**rule))
      return rules
  
  
  def deep_merge(a, b, path=None):
      """Recursively merge two dictionaries"""
  
      for key in b:
          if key in a:
              path = (path or []) + [str(key)]
              if isinstance(a[key], dict) and isinstance(b[key], dict):
                  deep_merge(a[key], b[key], path)
              elif isinstance(a[key], list) and isinstance(b[key], list):
                  a[key].extend(x for x in b[key] if x not in a[key])
              elif a[key] != b[key]:
                  raise ValueError(f"Destination field already exists: {'.'.join(path)} ('{a[key]}' != '{b[key]}')")
          else:
              a[key] = b[key]
      return a
  
  
  class TreeTraverser:
      """Automatic dispatching of node accessors."""
  
      def __init__(self):
          self.traversers = {}
  
      class NodeTraverser:
          def __init__(self, traversers, node_type):
              self.traversers = traversers
              self.node_type = node_type
              self.successful = 0
              self.total = 0
  
          def __call__(self, func):
              if self.node_type in self.traversers:
                  raise ValueError(f"Duplicate traverser for {self.node_type}: {func.__name__}")
              self.traversers[self.node_type] = self
  
              @functools.wraps(func)
              def traverse(*args, **kwargs):
                  self.total += 1
                  ret = func(*args, **kwargs)
                  self.successful += 1
                  return ret
  
              self.traverse = traverse
              return traverse
  
      def __call__(self, node_type):
          return self.NodeTraverser(self.traversers, node_type)
  
      def traverse(self, node, *args, **kwargs):
          return self.traversers[type(node)].traverse(node, *args, **kwargs)
  
      def get_stats(self):
          return {k.__name__: (v.successful, v.total) for k, v in self.traversers.items()}
  