sane_OpenMetrics.py

def dictkv_in_dictkv(dict_1: dict, dict_2: dict) -> bool:
  """
  Function that checks if a set of key-values (expressed as dictionary) can be 
  found in another set of key-values (expressed as dictionary).

  Args:
      dict_1 (dict): find those kv (needles)
      dict_2 (dict): search within these kv (haystack)

  Returns:
      bool: True if all can be found, False otherwise
  """
  if len(dict_1) > len(dict_2):
    return False
    
  for i in dict_1.items():
    for j in dict_2.items():
      if dict_2.get(i[0], None) == i[1]:
        pass
      else:
        return False
        
  return True



class OpenMetrics:
  """
  A Open Metrics aka Prometheus data format parser and handler.
  
  Initialization will parse text into a list of items.
  The filter method allows to filter metrics for name and/or labels.
  """
  
  om_text = None
  om_list = None
  
  # initialize object via parsing string into sections
  def __init__(self, text: str) -> None:
    self.om_text = text
    self.__to_list()
    
  def __to_list(self) -> None:
    # overwrite dict
    self.om_list = list()
    
    # go through sections/samples and make them a dict
    for section in text_string_to_metric_families(self.om_text):
      name = section.name
      type = section.type
      unit = section.unit
      if len(section.samples) == 0:
        self.om_list.append(
            dict(name=name, type=type, unit=unit, labels=dict(), value=None)
          )
      else:
        for s in section.samples:
          self.om_list.append(
            dict(name=name, type=type, unit=unit, labels=s.labels, value=s.value)
          )
  
  def filter(self, name=None, **kwargs):
    
    # filter
    res = []
    if name == None:
      if len(kwargs) == 0:
        res = self.om_list
      else:
        for item in self.om_list:
          if dictkv_in_dictkv(dict_1=kwargs, dict_2=item['labels']):
            res.append(item)
    else:
      for item in self.om_list:
          labels_ok = dictkv_in_dictkv(dict_1=kwargs, dict_2=item['labels'])
          name_ok   = item['name'] == name
          if labels_ok & name_ok :
            res.append(item)
    
    # return
    return res