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| 1 | +using ModelContextProtocol.Protocol.Messages; |
| 2 | +using ModelContextProtocol.Protocol.Transport; |
| 3 | +using ModelContextProtocol.Protocol.Types; |
| 4 | +using System.Text.Json; |
| 5 | +using System.Threading.Channels; |
| 6 | + |
| 7 | +namespace ModelContextProtocol.Tests.Utils; |
| 8 | + |
| 9 | +public class TestServerTransport : ITransport |
| 10 | +{ |
| 11 | + private readonly Channel<IJsonRpcMessage> _messageChannel; |
| 12 | + |
| 13 | + public bool IsConnected { get; set; } |
| 14 | + |
| 15 | + public ChannelReader<IJsonRpcMessage> MessageReader => _messageChannel; |
| 16 | + |
| 17 | + public List<IJsonRpcMessage> SentMessages { get; } = []; |
| 18 | + |
| 19 | + public Action<IJsonRpcMessage>? OnMessageSent { get; set; } |
| 20 | + |
| 21 | + public TestServerTransport() |
| 22 | + { |
| 23 | + _messageChannel = Channel.CreateUnbounded<IJsonRpcMessage>(new UnboundedChannelOptions |
| 24 | + { |
| 25 | + SingleReader = true, |
| 26 | + SingleWriter = true, |
| 27 | + }); |
| 28 | + IsConnected = true; |
| 29 | + } |
| 30 | + |
| 31 | + public ValueTask DisposeAsync() |
| 32 | + { |
| 33 | + _messageChannel.Writer.TryComplete(); |
| 34 | + IsConnected = false; |
| 35 | + return ValueTask.CompletedTask; |
| 36 | + } |
| 37 | + |
| 38 | + public async Task SendMessageAsync(IJsonRpcMessage message, CancellationToken cancellationToken = default) |
| 39 | + { |
| 40 | + SentMessages.Add(message); |
| 41 | + if (message is JsonRpcRequest request) |
| 42 | + { |
| 43 | + if (request.Method == RequestMethods.RootsList) |
| 44 | + await ListRoots(request, cancellationToken); |
| 45 | + else if (request.Method == RequestMethods.SamplingCreateMessage) |
| 46 | + await Sampling(request, cancellationToken); |
| 47 | + else |
| 48 | + await WriteMessageAsync(request, cancellationToken); |
| 49 | + } |
| 50 | + else if (message is JsonRpcNotification notification) |
| 51 | + { |
| 52 | + await WriteMessageAsync(notification, cancellationToken); |
| 53 | + } |
| 54 | + |
| 55 | + OnMessageSent?.Invoke(message); |
| 56 | + } |
| 57 | + |
| 58 | + private async Task ListRoots(JsonRpcRequest request, CancellationToken cancellationToken) |
| 59 | + { |
| 60 | + await WriteMessageAsync(new JsonRpcResponse |
| 61 | + { |
| 62 | + Id = request.Id, |
| 63 | + Result = JsonSerializer.SerializeToNode(new ListRootsResult |
| 64 | + { |
| 65 | + Roots = [] |
| 66 | + }), |
| 67 | + }, cancellationToken); |
| 68 | + } |
| 69 | + |
| 70 | + private async Task Sampling(JsonRpcRequest request, CancellationToken cancellationToken) |
| 71 | + { |
| 72 | + await WriteMessageAsync(new JsonRpcResponse |
| 73 | + { |
| 74 | + Id = request.Id, |
| 75 | + Result = JsonSerializer.SerializeToNode(new CreateMessageResult { Content = new(), Model = "model", Role = "role" }), |
| 76 | + }, cancellationToken); |
| 77 | + } |
| 78 | + |
| 79 | + private async Task WriteMessageAsync(IJsonRpcMessage message, CancellationToken cancellationToken = default) |
| 80 | + { |
| 81 | + await _messageChannel.Writer.WriteAsync(message, cancellationToken); |
| 82 | + } |
| 83 | +} |
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