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1 | // Licensed to the Apache Software Foundation(ASF) under one |
2 | // or more contributor license agreements.See the NOTICE file | |
3 | // distributed with this work for additional information | |
4 | // regarding copyright ownership.The ASF licenses this file | |
5 | // to you under the Apache License, Version 2.0 (the | |
6 | // "License"); you may not use this file except in compliance | |
7 | // with the License. You may obtain a copy of the License at | |
8 | // | |
9 | // http://www.apache.org/licenses/LICENSE-2.0 | |
10 | // | |
11 | // Unless required by applicable law or agreed to in writing, | |
12 | // software distributed under the License is distributed on an | |
13 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
14 | // KIND, either express or implied. See the License for the | |
15 | // specific language governing permissions and limitations | |
16 | // under the License. | |
17 | ||
18 | using System; | |
19 | using System.IO; | |
20 | using System.Threading; | |
21 | using System.Threading.Tasks; | |
22 | ||
23 | namespace Thrift.Transport | |
24 | { | |
25 | // ReSharper disable once InconsistentNaming | |
26 | public class TFramedTransport : TTransport | |
27 | { | |
28 | private const int HeaderSize = 4; | |
29 | private readonly byte[] HeaderBuf = new byte[HeaderSize]; | |
30 | private readonly Client.TMemoryBufferTransport ReadBuffer = new Client.TMemoryBufferTransport(); | |
31 | private readonly Client.TMemoryBufferTransport WriteBuffer = new Client.TMemoryBufferTransport(); | |
32 | private readonly TTransport InnerTransport; | |
33 | ||
34 | private bool IsDisposed; | |
35 | ||
36 | public class Factory : TTransportFactory | |
37 | { | |
38 | public override TTransport GetTransport(TTransport trans) | |
39 | { | |
40 | return new TFramedTransport(trans); | |
41 | } | |
42 | } | |
43 | ||
44 | public TFramedTransport(TTransport transport) | |
45 | { | |
46 | InnerTransport = transport ?? throw new ArgumentNullException(nameof(transport)); | |
47 | ||
48 | InitWriteBuffer(); | |
49 | } | |
50 | ||
51 | public override bool IsOpen => !IsDisposed && InnerTransport.IsOpen; | |
52 | ||
53 | public override async Task OpenAsync(CancellationToken cancellationToken) | |
54 | { | |
55 | CheckNotDisposed(); | |
56 | ||
57 | await InnerTransport.OpenAsync(cancellationToken); | |
58 | } | |
59 | ||
60 | public override void Close() | |
61 | { | |
62 | CheckNotDisposed(); | |
63 | ||
64 | InnerTransport.Close(); | |
65 | } | |
66 | ||
67 | public override async ValueTask<int> ReadAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken) | |
68 | { | |
69 | CheckNotDisposed(); | |
70 | ValidateBufferArgs(buffer, offset, length); | |
71 | ||
72 | if (!IsOpen) | |
73 | { | |
74 | throw new TTransportException(TTransportException.ExceptionType.NotOpen); | |
75 | } | |
76 | ||
77 | // Read another frame of data if we run out of bytes | |
78 | if (ReadBuffer.Position >= ReadBuffer.Length) | |
79 | { | |
80 | await ReadFrameAsync(cancellationToken); | |
81 | } | |
82 | ||
83 | return await ReadBuffer.ReadAsync(buffer, offset, length, cancellationToken); | |
84 | } | |
85 | ||
86 | private async ValueTask ReadFrameAsync(CancellationToken cancellationToken) | |
87 | { | |
88 | await InnerTransport.ReadAllAsync(HeaderBuf, 0, HeaderSize, cancellationToken); | |
89 | var size = DecodeFrameSize(HeaderBuf); | |
90 | ||
91 | ReadBuffer.SetLength(size); | |
92 | ReadBuffer.Seek(0, SeekOrigin.Begin); | |
93 | ||
94 | ArraySegment<byte> bufSegment; | |
95 | ReadBuffer.TryGetBuffer(out bufSegment); | |
96 | await InnerTransport.ReadAllAsync(bufSegment.Array, 0, size, cancellationToken); | |
97 | } | |
98 | ||
99 | public override async Task WriteAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken) | |
100 | { | |
101 | CheckNotDisposed(); | |
102 | ValidateBufferArgs(buffer, offset, length); | |
103 | ||
104 | if (!IsOpen) | |
105 | { | |
106 | throw new TTransportException(TTransportException.ExceptionType.NotOpen); | |
107 | } | |
108 | ||
109 | if (WriteBuffer.Length > (int.MaxValue - length)) | |
110 | { | |
111 | await FlushAsync(cancellationToken); | |
112 | } | |
113 | ||
114 | await WriteBuffer.WriteAsync(buffer, offset, length, cancellationToken); | |
115 | } | |
116 | ||
117 | public override async Task FlushAsync(CancellationToken cancellationToken) | |
118 | { | |
119 | CheckNotDisposed(); | |
120 | ||
121 | if (!IsOpen) | |
122 | { | |
123 | throw new TTransportException(TTransportException.ExceptionType.NotOpen); | |
124 | } | |
125 | ||
126 | ArraySegment<byte> bufSegment; | |
127 | WriteBuffer.TryGetBuffer(out bufSegment); | |
128 | ||
129 | int dataLen = bufSegment.Count - HeaderSize; | |
130 | if (dataLen < 0) | |
131 | { | |
132 | throw new InvalidOperationException(); // logic error actually | |
133 | } | |
134 | ||
135 | // Inject message header into the reserved buffer space | |
136 | EncodeFrameSize(dataLen, bufSegment.Array); | |
137 | ||
138 | // Send the entire message at once | |
139 | await InnerTransport.WriteAsync(bufSegment.Array, 0, bufSegment.Count, cancellationToken); | |
140 | ||
141 | InitWriteBuffer(); | |
142 | ||
143 | await InnerTransport.FlushAsync(cancellationToken); | |
144 | } | |
145 | ||
146 | private void InitWriteBuffer() | |
147 | { | |
148 | // Reserve space for message header to be put right before sending it out | |
149 | WriteBuffer.SetLength(HeaderSize); | |
150 | WriteBuffer.Seek(0, SeekOrigin.End); | |
151 | } | |
152 | ||
153 | private static void EncodeFrameSize(int frameSize, byte[] buf) | |
154 | { | |
155 | buf[0] = (byte) (0xff & (frameSize >> 24)); | |
156 | buf[1] = (byte) (0xff & (frameSize >> 16)); | |
157 | buf[2] = (byte) (0xff & (frameSize >> 8)); | |
158 | buf[3] = (byte) (0xff & (frameSize)); | |
159 | } | |
160 | ||
161 | private static int DecodeFrameSize(byte[] buf) | |
162 | { | |
163 | return | |
164 | ((buf[0] & 0xff) << 24) | | |
165 | ((buf[1] & 0xff) << 16) | | |
166 | ((buf[2] & 0xff) << 8) | | |
167 | (buf[3] & 0xff); | |
168 | } | |
169 | ||
170 | ||
171 | private void CheckNotDisposed() | |
172 | { | |
173 | if (IsDisposed) | |
174 | { | |
175 | throw new ObjectDisposedException(this.GetType().Name); | |
176 | } | |
177 | } | |
178 | ||
179 | // IDisposable | |
180 | protected override void Dispose(bool disposing) | |
181 | { | |
182 | if (!IsDisposed) | |
183 | { | |
184 | if (disposing) | |
185 | { | |
186 | ReadBuffer?.Dispose(); | |
187 | WriteBuffer?.Dispose(); | |
188 | InnerTransport?.Dispose(); | |
189 | } | |
190 | } | |
191 | IsDisposed = true; | |
192 | } | |
193 | } | |
194 | } |