Cloud Functions 函数任务

      # Sample Code:
      # print(event.get('task_string_key'))
      # event.set('task_int_array_key', [456, 789]);
      # event.log('some logging')

      def run(event):
        """Actual cloud function custom logic.
        Args:
          event : event object in main.py that contains all parameters.
        """
        return
    

      """Un-editable platform wrapper which invokes user code."""
    import traceback

    from flask import json
    from flask import jsonify
    from task import run

    VALUE_NAME = [
        'stringValue', 'intValue', 'doubleValue', 'booleanValue', 'protoValue'
    ]
    ARRAY_VALUE_NAME = {
        'stringArray': 'stringValues',
        'intArray': 'intValues',
        'doubleArray': 'doubleValues',
        'booleanArray': 'booleanValues',
        'protoArray': 'protoValues'
    }
    VALUE_TYPE_URL = 'type.googleapis.com/google.protobuf.Value'
    CLOUD_FUNCTION_EXCEPTION_KEY = 'CloudFunctionException'
    CLOUD_FUNCTION_LOGGING_KEY = 'CloudFunctionLogging'


    class _Event(object):
      """Event object."""

      def __init__(self, json_payload):
        self._event_params = json_payload.get('eventParameters', dict())
        self._task_params = json_payload.get('taskParameters', dict())
        self._log = []
        print('Event param is ' + str(self._event_params))
        print('Task param is ' + str(self._task_params))

      def set(self, key, value):
        """Set the event parameters key-value.

        Args:
          key: parameter key.
          value: parameter value.
        """
        new_param = self._create_param(key, value)
        param = self._get_param_by_key(key)
        if param is None:
          if 'parameters' not in self._event_params:
            self._event_params['parameters'] = []
          self._event_params['parameters'].append(new_param)
        else:
          param['value'] = new_param['value']

      def _create_param(self, key, value):
        """Create a new parameter with given key value pair.

        Args:
          key: parameter key.
          value: parameter value.

        Returns:
          parameter.
        """
        new_param = {}
        new_param['key'] = key
        if isinstance(value, str):
          new_param['value'] = {'stringValue': value}
        elif isinstance(value, int):
          new_param['value'] = {'intValue': value}
        elif isinstance(value, float):
          new_param['value'] = {'doubleValue': value}
        elif isinstance(value, bool):
          new_param['value'] = {'booleanValue': value}
        elif isinstance(value, dict):
          if 'type@' in value:
            new_param['value'] = {'protoValue': value}
          else:
            new_param['value'] = {
                'protoValue': {
                    '@type': 'type.googleapis.com/google.protobuf.Value',
                    'value': value
                }
            }
        elif isinstance(value, list):
          if not value:
            raise RuntimeError('Cannot create a param with empty list')
          if any(not isinstance(val, type(value[0])) for val in value):
            print('Not all elements in the list have the same type')
            new_param['value'] = {
                'protoValue': {
                    '@type': 'type.googleapis.com/google.protobuf.Value',
                    'value': value
                }
            }
          elif isinstance(value[0], str):
            new_param['value'] = {'stringArray': {'stringValues': value}}
          elif isinstance(value[0], int):
            new_param['value'] = {'intArray': {'intValues': value}}
          elif isinstance(value[0], float):
            new_param['value'] = {'doubleArray': {'doubleValues': value}}
          elif isinstance(value[0], bool):
            new_param['value'] = {'booleanArray': {'booleanValues': value}}
          elif isinstance(value[0], dict):
            if all('@type' in val and val['@type'] == value[0]['@type']
                   for val in value):
              new_param['value'] = {'protoArray': {'protoValues': value}}
            else:
              new_param['value'] = {
                  'protoValue': {
                      '@type': 'type.googleapis.com/google.protobuf.Value',
                      'value': value
                  }
              }
          else:
            raise RuntimeError('The type ' + type(value[0]) +
                               ' in the list is not supported')
        else:
          raise RuntimeError('Value ' + str(value) + ' has the type ' +
                             type(value) + ' that is not supported')
        return new_param

      def get(self, key):
        """Get the event parameter value for specified key.

        Args:
          key: parameter key.

        Returns:
          Parameter value.
        """
        param = self._get_param_by_key(key)
        if param is None:
          raise RuntimeError('Can not find param with key ' + key)
        return self._get_param_value(param)

      def _get_param_by_key(self, key):
        """Get the parameter for specified key.

        Args:
          key: parameter key.

        Returns:
          Parameter.
        """
        param = self._get_param_by_key_from_params(key, self._task_params)
        if param is None:
          return self._get_param_by_key_from_params(key, self._event_params)
        value = self._get_param_value(param)
        if isinstance(value, str) and len(value) > 2 and value.startswith(
            '$') and value.endswith('$'):
          return self._get_param_by_key_from_params(value[1:-1], self._event_params)
        return param

      def _get_param_by_key_from_params(self, key, params):
        """Get the parameter for specified key from event parameters.

        Args:
          key: parameter key.
          params: event parameters.

        Returns:
          Parameter.
        """
        if not isinstance(params, dict) or 'parameters' not in params:
          return None
        for param in params['parameters']:
          if param['key'] == key:
            return param
        return None

      def _get_param_value(self, param):
        """Get the parameter value for specified parameter.

        Args:
          param: parameter.

        Returns:
          Parameter value.
        """
        value = param['value']
        if len(value) != 1:
          raise RuntimeError('param does not have size of 1')
        for value_name in VALUE_NAME:
          if value_name in value:
            if value_name == 'protoValue' and value[value_name][
                '@type'] == VALUE_TYPE_URL:
              return value[value_name]['value']
            return value[value_name]
        for array_value_name in ARRAY_VALUE_NAME:
          if array_value_name in value:
            return value[array_value_name][ARRAY_VALUE_NAME[array_value_name]]
        raise RuntimeError('Cannot get value from param ' + str(param))

      def set_error(self):
        """Set the cloud function error to event parameters in order for user to see on IP."""

        self.set(CLOUD_FUNCTION_EXCEPTION_KEY, traceback.format_exc())

      def log(self, message):
        self._log.append(str(message))

      def get_response(self):
        """Get the response that can be returned to IP.

        Returns:
          The response text or any set of values that can be turned into a
          Response object using
          `make_response
          <http://flask.pocoo.org/docs/1.0/api/#flask.Flask.make_response>`.
        """
        if self._log:
          self.set(CLOUD_FUNCTION_LOGGING_KEY, self._log)
        res = {
            'eventParameters': self._event_params,
        }
        return jsonify(**json.loads(json.htmlsafe_dumps(res)))


    def execute_function(request):
      """Entry point of the cloud function.

      Args:
        request (flask.Request): HTTP request object.

      Returns:
        The response text or any set of values that can be turned into a
        Response object using
        `make_response
        <http://flask.pocoo.org/docs/1.0/api/#flask.Flask.make_response>`.
      """
      try:
        request_json = request.get_json(silent=True)
        event = _Event(request_json)
        run(event)
      except:
        event.set_error()
      return event.get_response()

    

    # Function dependencies, for example:
    # package>=version