# Source code for kafka.protocol.fetch

    from __future__ import absolute_import

    from kafka.protocol.api import Request, Response
    from kafka.protocol.types import Array, Int8, Int16, Int32, Int64, Schema, String, Bytes

    class FetchResponse_v0(Response):
        API_KEY = 1
        API_VERSION = 0
        SCHEMA = Schema(
            ('topics', Array(
                ('topics', String('utf-8')),
                ('partitions', Array(
                    ('partition', Int32),
                    ('error_code', Int16),
                    ('highwater_offset', Int64),
                    ('message_set', Bytes)))))
        )

    class FetchResponse_v1(Response):
        API_KEY = 1
        API_VERSION = 1
        SCHEMA = Schema(
            ('throttle_time_ms', Int32),
            ('topics', Array(
                ('topics', String('utf-8')),
                ('partitions', Array(
                    ('partition', Int32),
                    ('error_code', Int16),
                    ('highwater_offset', Int64),
                    ('message_set', Bytes)))))
        )

    class FetchResponse_v2(Response):
        API_KEY = 1
        API_VERSION = 2
        SCHEMA = FetchResponse_v1.SCHEMA  # message format changed internally

    class FetchResponse_v3(Response):
        API_KEY = 1
        API_VERSION = 3
        SCHEMA = FetchResponse_v2.SCHEMA

    class FetchResponse_v4(Response):
        API_KEY = 1
        API_VERSION = 4
        SCHEMA = Schema(
            ('throttle_time_ms', Int32),
            ('topics', Array(
                ('topics', String('utf-8')),
                ('partitions', Array(
                    ('partition', Int32),
                    ('error_code', Int16),
                    ('highwater_offset', Int64),
                    ('last_stable_offset', Int64),
                    ('aborted_transactions', Array(
                        ('producer_id', Int64),
                        ('first_offset', Int64))),
                    ('message_set', Bytes)))))
        )

    class FetchResponse_v5(Response):
        API_KEY = 1
        API_VERSION = 5
        SCHEMA = Schema(
            ('throttle_time_ms', Int32),
            ('topics', Array(
                ('topics', String('utf-8')),
                ('partitions', Array(
                    ('partition', Int32),
                    ('error_code', Int16),
                    ('highwater_offset', Int64),
                    ('last_stable_offset', Int64),
                    ('log_start_offset', Int64),
                    ('aborted_transactions', Array(
                        ('producer_id', Int64),
                        ('first_offset', Int64))),
                    ('message_set', Bytes)))))
        )

    class FetchResponse_v6(Response):
        """
        Same as FetchResponse_v5. The version number is bumped up to indicate that the client supports KafkaStorageException.
        The KafkaStorageException will be translated to NotLeaderForPartitionException in the response if version <= 5
        """
        API_KEY = 1
        API_VERSION = 6
        SCHEMA = FetchResponse_v5.SCHEMA

    class FetchRequest_v0(Request):
        API_KEY = 1
        API_VERSION = 0
        RESPONSE_TYPE = FetchResponse_v0
        SCHEMA = Schema(
            ('replica_id', Int32),
            ('max_wait_time', Int32),
            ('min_bytes', Int32),
            ('topics', Array(
                ('topic', String('utf-8')),
                ('partitions', Array(
                    ('partition', Int32),
                    ('offset', Int64),
                    ('max_bytes', Int32)))))
        )

    class FetchRequest_v1(Request):
        API_KEY = 1
        API_VERSION = 1
        RESPONSE_TYPE = FetchResponse_v1
        SCHEMA = FetchRequest_v0.SCHEMA

    class FetchRequest_v2(Request):
        API_KEY = 1
        API_VERSION = 2
        RESPONSE_TYPE = FetchResponse_v2
        SCHEMA = FetchRequest_v1.SCHEMA

    class FetchRequest_v3(Request):
        API_KEY = 1
        API_VERSION = 3
        RESPONSE_TYPE = FetchResponse_v3
        SCHEMA = Schema(
            ('replica_id', Int32),
            ('max_wait_time', Int32),
            ('min_bytes', Int32),
            ('max_bytes', Int32),  # This new field is only difference from FR_v2
            ('topics', Array(
                ('topic', String('utf-8')),
                ('partitions', Array(
                    ('partition', Int32),
                    ('offset', Int64),
                    ('max_bytes', Int32)))))
        )

    class FetchRequest_v4(Request):
        # Adds isolation_level field
        API_KEY = 1
        API_VERSION = 4
        RESPONSE_TYPE = FetchResponse_v4
        SCHEMA = Schema(
            ('replica_id', Int32),
            ('max_wait_time', Int32),
            ('min_bytes', Int32),
            ('max_bytes', Int32),
            ('isolation_level', Int8),
            ('topics', Array(
                ('topic', String('utf-8')),
                ('partitions', Array(
                    ('partition', Int32),
                    ('offset', Int64),
                    ('max_bytes', Int32)))))
        )

    class FetchRequest_v5(Request):
        # This may only be used in broker-broker api calls
        API_KEY = 1
        API_VERSION = 5
        RESPONSE_TYPE = FetchResponse_v5
        SCHEMA = Schema(
            ('replica_id', Int32),
            ('max_wait_time', Int32),
            ('min_bytes', Int32),
            ('max_bytes', Int32),
            ('isolation_level', Int8),
            ('topics', Array(
                ('topic', String('utf-8')),
                ('partitions', Array(
                    ('partition', Int32),
                    ('fetch_offset', Int64),
                    ('log_start_offset', Int64),
                    ('max_bytes', Int32)))))
        )

    class FetchRequest_v6(Request):
        """
        The body of FETCH_REQUEST_V6 is the same as FETCH_REQUEST_V5.
        The version number is bumped up to indicate that the client supports KafkaStorageException.
        The KafkaStorageException will be translated to NotLeaderForPartitionException in the response if version <= 5
        """
        API_KEY = 1
        API_VERSION = 6
        RESPONSE_TYPE = FetchResponse_v6
        SCHEMA = FetchRequest_v5.SCHEMA

    FetchRequest = [
        FetchRequest_v0, FetchRequest_v1, FetchRequest_v2,
        FetchRequest_v3, FetchRequest_v4, FetchRequest_v5,
        FetchRequest_v6
    ]
    FetchResponse = [
        FetchResponse_v0, FetchResponse_v1, FetchResponse_v2,
        FetchResponse_v3, FetchResponse_v4, FetchResponse_v5,
        FetchResponse_v6
    ]