1 /* |
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2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package java.net.http; |
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27 |
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28 import java.net.http.WSFrame.HeaderBuilder; |
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29 import java.net.http.WSFrame.Masker; |
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30 import java.net.http.WSOutgoingMessage.Binary; |
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31 import java.net.http.WSOutgoingMessage.Close; |
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32 import java.net.http.WSOutgoingMessage.Ping; |
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33 import java.net.http.WSOutgoingMessage.Pong; |
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34 import java.net.http.WSOutgoingMessage.Text; |
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35 import java.net.http.WSOutgoingMessage.Visitor; |
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36 import java.nio.ByteBuffer; |
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37 import java.nio.CharBuffer; |
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38 import java.nio.charset.CharacterCodingException; |
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39 import java.security.SecureRandom; |
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40 import java.util.function.Consumer; |
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41 |
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42 import static java.net.http.WSFrame.MAX_HEADER_SIZE_BYTES; |
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43 import static java.net.http.WSFrame.Opcode.BINARY; |
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44 import static java.net.http.WSFrame.Opcode.CLOSE; |
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45 import static java.net.http.WSFrame.Opcode.CONTINUATION; |
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46 import static java.net.http.WSFrame.Opcode.PING; |
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47 import static java.net.http.WSFrame.Opcode.PONG; |
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48 import static java.net.http.WSFrame.Opcode.TEXT; |
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49 import static java.util.Objects.requireNonNull; |
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50 |
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51 /* |
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52 * A Sender of outgoing messages. Given a message, |
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53 * |
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54 * 1) constructs the frame |
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55 * 2) initiates the channel write |
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56 * 3) notifies when the message has been sent |
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57 */ |
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58 final class WSMessageSender { |
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59 |
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60 private final Visitor frameBuilderVisitor; |
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61 private final Consumer<Throwable> completionEventConsumer; |
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62 private final WSWriter writer; |
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63 private final ByteBuffer[] buffers = new ByteBuffer[2]; |
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64 |
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65 WSMessageSender(RawChannel channel, Consumer<Throwable> completionEventConsumer) { |
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66 // Single reusable buffer that holds a header |
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67 this.buffers[0] = ByteBuffer.allocateDirect(MAX_HEADER_SIZE_BYTES); |
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68 this.frameBuilderVisitor = new FrameBuilderVisitor(); |
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69 this.completionEventConsumer = completionEventConsumer; |
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70 this.writer = new WSWriter(channel, this.completionEventConsumer); |
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71 } |
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72 |
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73 /* |
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74 * Tries to send the given message fully. Invoked once per message. |
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75 */ |
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76 boolean trySendFully(WSOutgoingMessage m) { |
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77 requireNonNull(m); |
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78 synchronized (this) { |
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79 try { |
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80 return sendNow(m); |
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81 } catch (Exception e) { |
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82 completionEventConsumer.accept(e); |
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83 return false; |
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84 } |
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85 } |
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86 } |
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87 |
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88 private boolean sendNow(WSOutgoingMessage m) { |
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89 buffers[0].clear(); |
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90 m.accept(frameBuilderVisitor); |
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91 buffers[0].flip(); |
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92 return writer.tryWriteFully(buffers); |
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93 } |
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94 |
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95 /* |
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96 * Builds and initiates a write of a frame, from a given message. |
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97 */ |
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98 class FrameBuilderVisitor implements Visitor { |
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99 |
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100 private final SecureRandom random = new SecureRandom(); |
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101 private final WSCharsetToolkit.Encoder encoder = new WSCharsetToolkit.Encoder(); |
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102 private final Masker masker = new Masker(); |
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103 private final HeaderBuilder headerBuilder = new HeaderBuilder(); |
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104 private boolean previousIsLast = true; |
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105 |
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106 @Override |
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107 public void visit(Text message) { |
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108 try { |
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109 buffers[1] = encoder.encode(CharBuffer.wrap(message.characters)); |
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110 } catch (CharacterCodingException e) { |
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111 completionEventConsumer.accept(e); |
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112 return; |
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113 } |
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114 int mask = random.nextInt(); |
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115 maskAndRewind(buffers[1], mask); |
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116 headerBuilder |
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117 .fin(message.isLast) |
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118 .opcode(previousIsLast ? TEXT : CONTINUATION) |
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119 .payloadLen(buffers[1].remaining()) |
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120 .mask(mask) |
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121 .build(buffers[0]); |
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122 previousIsLast = message.isLast; |
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123 } |
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124 |
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125 @Override |
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126 public void visit(Binary message) { |
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127 buffers[1] = message.bytes; |
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128 int mask = random.nextInt(); |
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129 maskAndRewind(buffers[1], mask); |
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130 headerBuilder |
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131 .fin(message.isLast) |
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132 .opcode(previousIsLast ? BINARY : CONTINUATION) |
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133 .payloadLen(message.bytes.remaining()) |
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134 .mask(mask) |
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135 .build(buffers[0]); |
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136 previousIsLast = message.isLast; |
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137 } |
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138 |
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139 @Override |
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140 public void visit(Ping message) { |
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141 buffers[1] = message.bytes; |
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142 int mask = random.nextInt(); |
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143 maskAndRewind(buffers[1], mask); |
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144 headerBuilder |
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145 .fin(true) |
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146 .opcode(PING) |
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147 .payloadLen(message.bytes.remaining()) |
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148 .mask(mask) |
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149 .build(buffers[0]); |
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150 } |
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151 |
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152 @Override |
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153 public void visit(Pong message) { |
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154 buffers[1] = message.bytes; |
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155 int mask = random.nextInt(); |
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156 maskAndRewind(buffers[1], mask); |
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157 headerBuilder |
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158 .fin(true) |
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159 .opcode(PONG) |
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160 .payloadLen(message.bytes.remaining()) |
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161 .mask(mask) |
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162 .build(buffers[0]); |
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163 } |
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164 |
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165 @Override |
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166 public void visit(Close message) { |
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167 buffers[1] = message.bytes; |
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168 int mask = random.nextInt(); |
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169 maskAndRewind(buffers[1], mask); |
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170 headerBuilder |
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171 .fin(true) |
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172 .opcode(CLOSE) |
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173 .payloadLen(buffers[1].remaining()) |
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174 .mask(mask) |
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175 .build(buffers[0]); |
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176 } |
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177 |
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178 private void maskAndRewind(ByteBuffer b, int mask) { |
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179 int oldPos = b.position(); |
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180 masker.mask(mask).applyMask(b, b); |
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181 b.position(oldPos); |
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182 } |
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183 } |
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184 } |
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