grpc 文件上传 C#

1. 相关结构体及函数声明

rpc FileUpload (stream FileRequest) returns(FileReply);

message FileRequest {
  string FileName = 1;
  bytes FileContents = 2;
}

message FileReply {
  int32 ResultCode = 1;
}

2. 函数实现

public override async Task<FileReply> FileUpload(IAsyncStreamReader<FileRequest> requestStream, ServerCallContext context)
{
    string exePath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
    Directory.SetCurrentDirectory(exePath);

    var response = new FileReply();
    try
    {
        int count = 0;
        BinaryWriter fileWriter = null;
        while (await requestStream.MoveNext())
        {
            var activeRequest = requestStream.Current;
            if (count == 0)
            {
                fileWriter = new BinaryWriter(new FileStream(activeRequest.FileName + "_Received", FileMode.Create));
                count++;
            }

            fileWriter.Write(activeRequest.FileContents.ToByteArray());
        }
        fileWriter.Close();

        response.ResultCode = 0;
    }
    catch (Exception e1)
    {
        Console.WriteLine(e1.Message);

        response.ResultCode = -1;
    }
            
    return response;
}

3. 客户端调用

static async Task Main(string[] args)
{
    try
    {
        if (args.Length == 0)
        {
            Console.WriteLine("没有指定要上传的文件名，操作中止!");
            return;
        }

        string filePath = args[0]; 
        const int ByteCount_OneSend = 1024 * 1024;

        var channel = GrpcChannel.ForAddress("http://172.22.113.93:5000");
        var client = new Greeter.GreeterClient(channel);

        Console.WriteLine("开始上传：");
        Console.WriteLine("文件名 = {0}", filePath);
        byte[] sendBytes = new byte[ByteCount_OneSend];
        FileStream fs = File.OpenRead(filePath);
        using (var call = client.FileUpload())
        {
            var requestStream = call.RequestStream;
            FileRequest request = new FileRequest();
            request.FileName = filePath;
            int readCount = 0;
            do
            {
                readCount = fs.Read(sendBytes, 0, ByteCount_OneSend);
                if (readCount == 0)
                {
                    break;  
                }

                request.FileContents = ByteString.CopyFrom(sendBytes, 0, readCount);
                await requestStream.WriteAsync(request);
                Console.Write(".");
            }
            while (readCount > 0);

            fs.Close();
            await call.RequestStream.CompleteAsync();
            await call;
        }
        Console.WriteLine("
上传成功。");
    }
    catch (Exception e1)
    {
        Console.WriteLine(e1.Message);
    }
    finally
    {
        Console.WriteLine("
Press any key to exit...");
        Console.ReadKey();
    }
}