| from __future__ import absolute_import |
|
|
| import abc |
|
|
| from kafka.protocol.struct import Struct |
| from kafka.protocol.types import Int16, Int32, String, Schema, Array |
|
|
|
|
| class RequestHeader(Struct): |
| SCHEMA = Schema( |
| ('api_key', Int16), |
| ('api_version', Int16), |
| ('correlation_id', Int32), |
| ('client_id', String('utf-8')) |
| ) |
|
|
| def __init__(self, request, correlation_id=0, client_id='kafka-python'): |
| super(RequestHeader, self).__init__( |
| request.API_KEY, request.API_VERSION, correlation_id, client_id |
| ) |
|
|
|
|
| class Request(Struct): |
| __metaclass__ = abc.ABCMeta |
|
|
| @abc.abstractproperty |
| def API_KEY(self): |
| """Integer identifier for api request""" |
| pass |
|
|
| @abc.abstractproperty |
| def API_VERSION(self): |
| """Integer of api request version""" |
| pass |
|
|
| @abc.abstractproperty |
| def SCHEMA(self): |
| """An instance of Schema() representing the request structure""" |
| pass |
|
|
| @abc.abstractproperty |
| def RESPONSE_TYPE(self): |
| """The Response class associated with the api request""" |
| pass |
|
|
| def expect_response(self): |
| """Override this method if an api request does not always generate a response""" |
| return True |
|
|
| def to_object(self): |
| return _to_object(self.SCHEMA, self) |
|
|
|
|
| class Response(Struct): |
| __metaclass__ = abc.ABCMeta |
|
|
| @abc.abstractproperty |
| def API_KEY(self): |
| """Integer identifier for api request/response""" |
| pass |
|
|
| @abc.abstractproperty |
| def API_VERSION(self): |
| """Integer of api request/response version""" |
| pass |
|
|
| @abc.abstractproperty |
| def SCHEMA(self): |
| """An instance of Schema() representing the response structure""" |
| pass |
|
|
| def to_object(self): |
| return _to_object(self.SCHEMA, self) |
|
|
|
|
| def _to_object(schema, data): |
| obj = {} |
| for idx, (name, _type) in enumerate(zip(schema.names, schema.fields)): |
| if isinstance(data, Struct): |
| val = data.get_item(name) |
| else: |
| val = data[idx] |
|
|
| if isinstance(_type, Schema): |
| obj[name] = _to_object(_type, val) |
| elif isinstance(_type, Array): |
| if isinstance(_type.array_of, (Array, Schema)): |
| obj[name] = [ |
| _to_object(_type.array_of, x) |
| for x in val |
| ] |
| else: |
| obj[name] = val |
| else: |
| obj[name] = val |
|
|
| return obj |
|
|
