/// <summary>
/// 发送json格式的Http Rpc远程调用
/// </summary>
/// <typeparam name="T">结果对象的类型</typeparam>
/// <returns>返回远程调用结果</returns>
public async Task <T> Call <T>()
{
// 远程请求
byte[] data = null;
using (var request = CreateRequestMessage())
using (var content = new PushStreamContent((ws) => RpcClientKit.WriteFrame(ws, _data, _isCompressed)))
{
request.Content = content;
HttpResponseMessage response;
try
{
response = await _client.SendAsync(request).ConfigureAwait(false);
}
catch (Exception ex)
{
throw new ServerException("服务器连接失败", $"调用【{_methodName}】时服务器连接失败！\r\n{ex.Message}");
}
if (response.StatusCode != System.Net.HttpStatusCode.OK)
{
#if !SERVER
// 无权限时
if (response.StatusCode == System.Net.HttpStatusCode.Unauthorized)
{
// 已登录则提示无权限
if (Kit.IsLogon)
{
throw new KnownException($"⚡对【{_methodName}】无访问权限！");
}
// 跳转到登录页面
Kit.Login(true);
throw new KnownException("请先登录您的账号！");
}
#endif
throw new ServerException($"服务器返回状态码：{response.StatusCode}", $"调用【{_methodName}】时返回状态码：{response.StatusCode}");
}
var stream = await response.Content.ReadAsStreamAsync();
data = await RpcClientKit.ReadFrame(stream);
response.Dispose();
}
return(ParseResult <T>(data));
}
/// <summary>
/// 读取从服务器返回的下一帧数据
/// </summary>
/// <returns></returns>
public async Task <bool> MoveNext()
{
try
{
// _responseStream.ReadAsync 使用 CancellationToken 也只有第一次取消时有效，所以未使用！
// 此处只在服务端取消连接时抛出异常！
var data = await RpcClientKit.ReadFrame(_responseStream);
_val = RpcKit.ParseBytes <object>(data);
return(true);
}
catch
{
Dispose();
}
return(false);
}
/// <summary>
/// 向服务端写入一帧
/// </summary>
/// <param name="p_message">支持序列化的对象</param>
/// <returns></returns>
public async Task <bool> Write(object p_message)
{
// 请求流已关闭
if (_rpc.RequestStream == null || _rpc.RequestCompleted)
{
_rpc.FinishRequest();
return(false);
}
try
{
await RpcClientKit.WriteFrame(_rpc.RequestStream, p_message);
return(true);
}
catch { }
_rpc.FinishRequest();
return(false);
}
protected RequestWriter CreateWriter(HttpRequestMessage p_request)
{
_writeStreamTcs = new TaskCompletionSource <Stream>(TaskCreationOptions.RunContinuationsAsynchronously);
_writeCompleteTcs = new TaskCompletionSource <bool>(TaskCreationOptions.RunContinuationsAsynchronously);
p_request.Content = new PushStreamContent(async(stream) =>
{
// 不同平台stream类型不同，造成uwp、android、ios客户端调用stream.FlushAsync()时并未发送！
// asp.net core：System.Net.Http.Http2Connection.Http2Stream.Http2WriteStream
// uwp：System.Net.Http.HttpContent.LimitMemoryStream
// mono：System.Net.Http.HttpContent.FixedMemoryStream
// 先发送调用帧
await RpcClientKit.WriteFrame(stream, _data, _isCompressed).ConfigureAwait(false);
// 允许自定义写入
_writeStreamTcs.TrySetResult(stream);
// 控制发送任务不结束，未结束前一直可发送
await _writeCompleteTcs.Task;
});
return(new RequestWriter(this));
}
/// <summary>
/// 启动Http2协议的远程调用，客户端发送一个请求，服务端返回数据流响应
/// </summary>
/// <returns></returns>
public async Task <ResponseReader> Call()
{
try
{
using (var request = CreateRequestMessage())
using (var content = new PushStreamContent((ws) => RpcClientKit.WriteFrame(ws, _data, _isCompressed)))
{
// 必须设置 WebAssemblyEnableStreamingResponse 为 true，WASM 才会返回 stream 类型的 response；
// 如果不设置，则只在整个response结束时收到一次，无法实现服务器推送流模式！！！参见：
// https://github.com/grpc/grpc-dotnet/blob/master/src/Grpc.Net.Client.Web/GrpcWebHandler.cs#L137
//
// 此限制和服务端无关，只是WASM客户端在收到服务器推送后的处理方式不同，默认response 非 stream模式，参见：
// https://github.com/mono/mono/blob/a0d69a4e876834412ba676f544d447ec331e7c01/sdks/wasm/framework/src/System.Net.Http.WebAssemblyHttpHandler/WebAssemblyHttpHandler.cs#L149
//
// https://github.com/mono/mono/issues/18718
#if WASM
#pragma warning disable CS0618
request.Properties["WebAssemblyEnableStreamingResponse"] = true;
#pragma warning restore CS0618
#endif
request.Content = content;
// 一定是ResponseHeadersRead，否则只在结束时收到一次！！！众里寻他千百度
var response = await _client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, CancellationToken.None);
response.EnsureSuccessStatusCode();
var reader = new ResponseReader(response);
// wasm中增加上述设置后返回 stream 正常！
await reader.InitStream();
return(reader);
}
}
catch (Exception ex)
{
throw new Exception($"调用【{_methodName}】时服务器连接失败！\r\n{ex.Message}");
}
}
