【proto】python根据proto文件构造message，并换为二进制

一、场景

    测试需要构造数据，而且存储的格式为grpc消息的二进制格式，所以必须要根据proto构造二进制

 

二、构造方法

1、根据proto文件生成python格式的pb文件

python3 -m grpc_tools.protoc -I. proto/upload_state.proto --python_out=. --grpc_python_out=.

 

2、检查文件生成

 

3、编写构造脚本

from google.protobuf.json_format import MessageToJson

import upload_state_pb2 as upload_state_pb2

def pack_data_proto_obj(vehicle, data_info_list):
    # 生成file_info_list
    file_info_list_obj = upload_state_pb2.FileInfoList()
    file_info_list_obj.update_operation = "UPDATE"
    for data_info in data_info_list:for index in range(len(data_info)):
            # 生成file_info对象
            file_info_obj = upload_state_pb2.FileInfo()
            file_info_obj.file_name = data_info[index]["file_name"].replace("vehicle", vehicle)
            file_info_obj.file_type = data_info[index]["file_type"]
            ......
            file_info_obj.del_flag = data_info[index]["del_flag"]
            file_info_list_obj.file_infos.append(file_info_obj)

    # 生成vehicle_upload_info
    vehicle_upload_info_obj = upload_state_pb2.VehicleUploadInfo()
    vehicle_upload_info_obj.vehicle = vehicle
    vehicle_upload_info_obj.msg_type = data["msg_type"]
    vehicle_upload_info_obj.file_info_list.CopyFrom(file_info_list_obj)

    proto_data = vehicle_upload_info_obj.SerializeToString()

    print(proto_data)
    vehicle_upload_info_obj2 = upload_state_pb2.VehicleUploadInfo()
    vehicle_upload_info_obj2.ParseFromString(proto_data)
    json_string = MessageToJson(vehicle_upload_info_obj2)
    print(json_string)
    return proto_data


# 转proto字符串
# vehicle_upload_info_obj1 = upload_state_pb2.VehicleUploadInfo()
# vehicle_upload_info_obj1.ParseFromString(proto_data)
# print(vehicle_upload_info_obj1)

vehicle_upload_info_obj2 = upload_state_pb2.VehicleUploadInfo()
vehicle_upload_info_obj2.ParseFromString(proto_data)
json_string = MessageToJson(vehicle_upload_info_obj2)
print(json_string)

if __name__ == '__main__':
    pass

内容省略，主要是三层message嵌套

关键点就是append和CopyFrom来组装

消息转换的方法MessageToJson，ParseFromString

 

 

 

参考链接：

proto与json的互相转换_proto转json-CSDN博客

Python 使用 Protobuf 的 message 嵌套，repeated 字段类型，google.protobuf.Any 字段类型，enum 枚举字段_protobuf repeated enum-CSDN博客

Python的基本Protobuf指南(序列化数据) - DaisyLinux - 博客园