For https://github.com/GoogleCloudPlatform/google-cloud-python/issues/2674

repro.py

import json

from google.cloud.proto.logging.v2.log_entry_pb2 import LogEntry
from google.protobuf.json_format import MessageToJson
from google.protobuf.json_format import ParseDict
from google.protobuf.struct_pb2 import ListValue
from google.protobuf.struct_pb2 import Struct
from google.protobuf.struct_pb2 import Value


def main():
    line = Struct(fields={
        'time': Value(string_value='2016-09-04T13:00:08.139759Z'),
        'severity': Value(string_value='INFO'),
        'logMessage': Value(string_value='Simply testing'),
    })
    lines = ListValue()
    lines.values.add(struct_value=line)

    pb_fields = {
        '@type': Value(string_value='type.googleapis.com/google.appengine.logging.v1.RequestLog'),
        'startTime':Value(string_value='2016-09-04T13:00:08.117102Z'),
        'endTime':Value(string_value='2016-09-04T13:00:08.117102Z'),
        'latency':Value(string_value='0s'),
        'responseSize':Value(string_value='349'),
        'userAgent': Value(string_value='agent'),
        'resource': Value(string_value='test resource'),
        'line': Value(list_value=lines),
    }

    labels =  {
        'serviceName': 'custom.googleapis.com',
        'custom.googleapis.com/primary_key': 'fake_module',
        'custom.googleapis.com/secondary_key': 'fake_version',
        'zone': 'us6',
    }

    message_pb = Struct(fields=pb_fields)
    resource = {
        'logName': 'projects/banana-elephant/logs/test',
        'resource': {'type': 'global'},
        'protoPayload': json.loads(MessageToJson(message_pb)),
        'labels': labels,
    }

    entry_pb = LogEntry()
    ParseDict(resource, entry_pb)


if __name__ == '__main__':
    main()