如何在gRPC调用中直接传递proto二进制文件？

syntax = "proto3";

message File {
  bytes content = 1;
}

service FileService {
  rpc UploadFile(File) returns (google.protobuf.Empty);
}

protoc --go_out=. file.proto

import (
    "context"
    "io/ioutil"
    "log"

    pb "path/to/generated/proto/package"
)

type fileServer struct{}

func (s *fileServer) UploadFile(ctx context.Context, req *pb.File) (*google.protobuf.Empty, error) {
    // 处理接收到的二进制文件内容
    content := req.GetContent()
    // 其他逻辑处理...
    return &google.protobuf.Empty{}, nil
}

import (
    "context"
    "io/ioutil"
    "log"

    pb "path/to/generated/proto/package"
)

func main() {
    // 读取二进制文件内容
    content, err := ioutil.ReadFile("path/to/file.bin")
    if err != nil {
        log.Fatalf("Failed to read file: %v", err)
    }

    // 创建gRPC连接
    conn, err := grpc.Dial("server_address:port", grpc.WithInsecure())
    if err != nil {
        log.Fatalf("Failed to connect: %v", err)
    }
    defer conn.Close()

    // 创建FileService客户端
    client := pb.NewFileServiceClient(conn)

    // 封装二进制文件内容到消息类型中
    req := &pb.File{
        Content: content,
    }

    // 调用UploadFile方法
    _, err = client.UploadFile(context.Background(), req)
    if err != nil {
        log.Fatalf("Failed to upload file: %v", err)
    }
}