/
message_metadata.py
37 lines (31 loc) · 1.19 KB
/
message_metadata.py
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# Copyright 2020 Google LLC
#
# Licensed 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.
from typing import NamedTuple
import json
from google.cloud.pubsublite_v1.types.common import Cursor
from google.cloud.pubsublite.types.partition import Partition
class MessageMetadata(NamedTuple):
partition: Partition
cursor: Cursor
def encode(self) -> str:
return json.dumps(
{"partition": self.partition.value, "offset": self.cursor.offset}
)
@staticmethod
def decode(source: str) -> "MessageMetadata":
loaded = json.loads(source)
return MessageMetadata(
partition=Partition(loaded["partition"]),
cursor=Cursor(offset=loaded["offset"]),
)