1 | // **************************************************************************
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2 | /** @class Connection
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3 |
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4 | @brief Maintains an ansynchronous TCP/IP client connection
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5 |
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6 | @todo
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7 | Unify with ConnectionUSB
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8 |
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9 | */
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10 | // **************************************************************************
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11 | #include "Connection.h"
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12 |
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13 | using namespace std;
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14 |
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15 | namespace ba = boost::asio;
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16 | namespace bs = boost::system;
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17 | namespace dummy = ba::placeholders;
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18 |
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19 | using ba::ip::tcp;
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20 |
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21 | // -------- Abbreviations for starting async tasks ---------
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22 |
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23 | int Connection::Write(const Time &t, const string &txt, int qos)
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24 | {
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25 | if (fLog)
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26 | return fLog->Write(t, txt, qos);
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27 |
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28 | return MessageImp::Write(t, txt, qos);
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29 | }
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30 |
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31 | void Connection::AsyncRead(const ba::mutable_buffers_1 buffers, int type)
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32 | {
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33 | ba::async_read(*this, buffers,
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34 | boost::bind(&Connection::HandleReceivedData, this,
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35 | dummy::error, dummy::bytes_transferred, type));
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36 | }
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37 |
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38 | void Connection::AsyncWrite(const ba::const_buffers_1 &buffers)
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39 | {
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40 | ba::async_write(*this, buffers,
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41 | boost::bind(&Connection::HandleSentData, this,
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42 | dummy::error, dummy::bytes_transferred));
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43 | }
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44 |
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45 | /*
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46 | void Connection::AsyncWait(ba::deadline_timer &timer, int millisec,
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47 | void (Connection::*handler)(const bs::error_code&))
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48 | {
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49 | // - The boost::asio::basic_deadline_timer::expires_from_now()
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50 | // function cancels any pending asynchronous waits, and returns
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51 | // the number of asynchronous waits that were cancelled. If it
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52 | // returns 0 then you were too late and the wait handler has
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53 | // already been executed, or will soon be executed. If it
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54 | // returns 1 then the wait handler was successfully cancelled.
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55 | // - If a wait handler is cancelled, the bs::error_code passed to
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56 | // it contains the value bs::error::operation_aborted.
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57 | timer.expires_from_now(boost::posix_time::milliseconds(millisec));
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58 |
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59 | timer.async_wait(boost::bind(handler, this, dummy::error));
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60 | }
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61 | */
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62 |
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63 | void Connection::AsyncConnect(tcp::resolver::iterator iterator)
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64 | {
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65 | tcp::endpoint endpoint = *iterator;
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66 |
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67 | // AsyncConnect + Deadline
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68 | async_connect(endpoint,
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69 | boost::bind(&Connection::ConnectIter,
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70 | this, iterator, ba::placeholders::error));
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71 |
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72 | // We will get a "Connection timeout anyway"
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73 | //AsyncWait(fConnectTimeout, 5, &Connection::HandleConnectTimeout);
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74 | }
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75 |
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76 | void Connection::AsyncConnect()
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77 | {
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78 | // AsyncConnect + Deadline
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79 | async_connect(fEndpoint,
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80 | boost::bind(&Connection::ConnectAddr,
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81 | this, fEndpoint, ba::placeholders::error));
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82 |
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83 | // We will get a "Connection timeout anyway"
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84 | //AsyncWait(fConnectTimeout, 5, &Connection::HandleConnectTimeout);
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85 | }
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86 |
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87 | // ------------------------ close --------------------------
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88 | // close from another thread
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89 | void Connection::CloseImp(bool restart)
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90 | {
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91 | if (IsConnected() && fVerbose)
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92 | {
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93 | ostringstream str;
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94 | str << "Connection closed to " << URL() << ".";
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95 | Info(str);
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96 | }
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97 |
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98 | // Stop any pending connection attempt
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99 | fConnectionTimer.cancel();
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100 |
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101 | // Close possible open connections
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102 | if (is_open())
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103 | {
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104 | bs::error_code err;
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105 | shutdown(boost::asio::ip::tcp::socket::shutdown_both, err);
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106 | if (err)
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107 | {
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108 | ostringstream str;
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109 | str << "Shutting down " << URL() << ": " << err.message() << " (" << err << ")";// << endl;
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110 | Error(str);
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111 | }
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112 | close(err);
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113 | if (err)
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114 | {
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115 | ostringstream str;
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116 | str << "Closing " << URL() << ": " << err.message() << " (" << err << ")";// << endl;
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117 | Error(str);
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118 | }
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119 | }
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120 |
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121 | // Reset the connection status
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122 | fQueueSize = 0;
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123 | fConnectionStatus = kDisconnected;
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124 |
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125 | // Stop deadline counters
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126 | fInTimeout.cancel();
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127 | fOutTimeout.cancel();
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128 |
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129 | if (!restart || IsConnecting())
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130 | return;
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131 |
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132 | // We need some timeout before reconnecting!
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133 | // And we have to check if we are alreayd trying to connect
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134 | // We shoudl wait until all operations in progress were canceled
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135 |
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136 | // Start trying to reconnect
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137 | fMsgConnect = "";
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138 | fErrConnect = "";
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139 | StartConnect();
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140 | }
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141 |
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142 | void Connection::PostClose(bool restart)
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143 | {
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144 | #if BOOST_VERSION < 107000
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145 | get_io_service().post(boost::bind(&Connection::CloseImp, this, restart));
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146 | #else
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147 | ba::post(boost::bind(&Connection::CloseImp, this, restart));
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148 | #endif
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149 | }
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150 |
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151 | // ------------------------ write --------------------------
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152 | void Connection::HandleWriteTimeout(const bs::error_code &error)
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153 | {
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154 | if (error==ba::error::basic_errors::operation_aborted)
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155 | return;
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156 |
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157 | // 125: Operation canceled (bs::error_code(125, bs::system_category))
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158 | if (error)
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159 | {
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160 | ostringstream str;
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161 | str << "Write timeout of " << URL() << ": " << error.message() << " (" << error << ")";// << endl;
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162 | Error(str);
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163 |
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164 | CloseImp();
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165 | return;
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166 | }
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167 |
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168 | if (!is_open())
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169 | {
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170 | // For example: Here we could schedule a new accept if we
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171 | // would not want to allow two connections at the same time.
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172 | return;
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173 | }
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174 |
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175 | // Check whether the deadline has passed. We compare the deadline
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176 | // against the current time since a new asynchronous operation
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177 | // may have moved the deadline before this actor had a chance
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178 | // to run.
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179 | if (fOutTimeout.expires_at() > ba::deadline_timer::traits_type::now())
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180 | return;
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181 |
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182 | Error("fOutTimeout has expired, writing data to "+URL());
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183 |
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184 | CloseImp();
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185 | }
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186 |
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187 | void Connection::HandleSentData(const bs::error_code& error, size_t n)
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188 | {
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189 | if (error==ba::error::basic_errors::operation_aborted)
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190 | return;
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191 |
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192 | if (error && error != ba::error::not_connected)
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193 | {
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194 | ostringstream str;
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195 | str << "Writing to " << URL() << ": " << error.message() << " (" << error << ")";// << endl;
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196 | Error(str);
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197 |
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198 | CloseImp();
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199 | return;
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200 | }
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201 |
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202 | if (error == ba::error::not_connected)
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203 | {
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204 | ostringstream msg;
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205 | msg << n << " bytes could not be sent to " << URL() << " due to missing connection.";
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206 | Warn(msg);
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207 |
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208 | return;
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209 | }
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210 |
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211 | if (--fQueueSize==0)
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212 | fOutTimeout.cancel();
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213 |
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214 | if (fDebugTx)
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215 | {
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216 | ostringstream msg;
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217 | msg << n << " bytes successfully sent to " << URL();
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218 | Debug(msg);
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219 | }
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220 | }
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221 |
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222 | void Connection::PostMessage(const void *ptr, size_t sz)
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223 | {
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224 | // This function can be called from a different thread...
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225 | if (!is_open())
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226 | return;
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227 |
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228 | // ... this is why we have to increase fQueueSize first
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229 | fQueueSize++;
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230 |
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231 | // ... and shift the deadline timer
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232 | // This is not ideal, because if we are continously
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233 | // filling the buffer, it will never timeout
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234 | AsyncWait(fOutTimeout, 5000, &Connection::HandleWriteTimeout);
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235 |
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236 | // Now we can schedule the buffer to be sent
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237 | AsyncWrite(ba::const_buffers_1(ptr, sz));
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238 |
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239 | // If a socket is closed, all pending asynchronous
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240 | // operation will be aborted.
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241 | }
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242 |
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243 | void Connection::PostMessage(const string &cmd, size_t max)
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244 | {
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245 | if (max==size_t(-1))
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246 | max = cmd.length()+1;
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247 |
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248 | PostMessage(cmd.c_str(), min(cmd.length()+1, max));
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249 | }
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250 |
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251 | void Connection::HandleConnectionTimer(const bs::error_code &error)
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252 | {
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253 | if (error==ba::error::basic_errors::operation_aborted)
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254 | return;
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255 |
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256 | if (error)
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257 | {
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258 | ostringstream str;
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259 | str << "Connetion timer of " << URL() << ": " << error.message() << " (" << error << ")";// << endl;
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260 | Error(str);
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261 | }
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262 |
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263 | if (is_open())
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264 | {
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265 | // For example: Here we could schedule a new accept if we
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266 | // would not want to allow two connections at the same time.
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267 | return;
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268 | }
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269 |
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270 | // Check whether the deadline has passed. We compare the deadline
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271 | // against the current time since a new asynchronous operation
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272 | // may have moved the deadline before this actor had a chance
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273 | // to run.
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274 | if (fConnectionTimer.expires_at() < ba::deadline_timer::traits_type::now())
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275 | StartConnect();
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276 | }
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277 |
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278 | bool Connection::ConnectImp(const tcp::endpoint &endpoint, const bs::error_code& error)
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279 | {
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280 | const string host = endpoint.port()==0 ? "" :
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281 | endpoint.address().to_string()+':'+to_string((long long unsigned int)endpoint.port());
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282 |
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283 | // Connection established
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284 | if (!error)
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285 | {
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286 | set_option(socket_base::keep_alive(true));
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287 |
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288 | const int optval = 30;
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289 |
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290 | #if BOOST_VERSION <107000
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291 | // First keep alive after 30s
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292 | setsockopt(native(), SOL_TCP, TCP_KEEPIDLE, &optval, sizeof(optval));
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293 | // New keep alive after 30s
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294 | setsockopt(native(), SOL_TCP, TCP_KEEPINTVL, &optval, sizeof(optval));
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295 | #else
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296 | // First keep alive after 30s
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297 | setsockopt(native_handle(), SOL_TCP, TCP_KEEPIDLE, &optval, sizeof(optval));
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298 | // New keep alive after 30s
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299 | setsockopt(native_handle(), SOL_TCP, TCP_KEEPINTVL, &optval, sizeof(optval));
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300 | #endif
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301 |
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302 | if (fVerbose)
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303 | Info("Connection established to "+host+"...");
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304 |
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305 | fQueueSize = 0;
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306 | fConnectionStatus = kConnected;
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307 |
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308 | ConnectionEstablished();
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309 | return true;
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310 | }
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311 |
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312 | // If returning from run will lead to deletion of this
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313 | // instance, close() is not needed (maybe implicitly called).
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314 | // If run is called again, close() is needed here. Otherwise:
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315 | // Software caused connection abort when we try to resolve
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316 | // the endpoint again.
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317 | CloseImp(false);
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318 |
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319 | ostringstream msg;
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320 | if (!host.empty())
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321 | msg << "Connecting to " << host << ": " << error.message() << " (" << error << ")";
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322 |
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323 | if (fErrConnect!=msg.str())
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324 | {
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325 | if (error!=ba::error::basic_errors::connection_refused)
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326 | fMsgConnect = "";
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327 | fErrConnect = msg.str();
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328 | Warn(fErrConnect);
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329 | }
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330 |
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331 | if (error==ba::error::basic_errors::operation_aborted)
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332 | return true;
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333 |
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334 | fConnectionStatus = kConnecting;
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335 |
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336 | return false;
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337 | /*
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338 | // Go on with the next
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339 | if (++iterator != tcp::resolver::iterator())
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340 | {
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341 | AsyncConnect(iterator);
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342 | return;
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343 | }
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344 | */
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345 | // No more entries to try, if we would not put anything else
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346 | // into the queue anymore it would now return (run() would return)
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347 |
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348 | // Since we don't want to block the main loop, we wait using an
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349 | // asnychronous timer
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350 |
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351 | // FIXME: Should we move this before AsyncConnect() ?
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352 | // AsyncWait(fConnectionTimer, 250, &Connection::HandleConnectionTimer);
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353 | }
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354 |
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355 | void Connection::ConnectIter(tcp::resolver::iterator iterator, const bs::error_code& error)
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356 | {
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357 | if (ConnectImp(*iterator, error))
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358 | return;
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359 |
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360 | // Go on with the next
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361 | if (++iterator != tcp::resolver::iterator())
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362 | {
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363 | AsyncConnect(iterator);
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364 | return;
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365 | }
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366 |
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367 | // No more entries to try, if we would not put anything else
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368 | // into the queue anymore it would now return (run() would return)
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369 | AsyncWait(fConnectionTimer, 250, &Connection::HandleConnectionTimer);
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370 | }
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371 |
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372 | void Connection::ConnectAddr(const tcp::endpoint &endpoint, const bs::error_code& error)
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373 | {
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374 | if (ConnectImp(endpoint, error))
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375 | return;
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376 |
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377 | AsyncWait(fConnectionTimer, 250, &Connection::HandleConnectionTimer);
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378 | }
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379 |
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380 | // FIXME: Async connect should get address and port as an argument
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381 | void Connection::StartConnect()
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382 | {
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383 | fConnectionStatus = kConnecting;
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384 |
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385 | if (fEndpoint!=tcp::endpoint())
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386 | {
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387 | ostringstream msg;
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388 | msg << "Trying to connect to " << fEndpoint << "...";
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389 | if (fMsgConnect!=msg.str())
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390 | {
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391 | fMsgConnect = msg.str();
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392 | Info(msg);
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393 | }
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394 |
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395 | AsyncConnect();
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396 | return;
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397 | }
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398 |
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399 | const bool valid = !fAddress.empty() || !fPort.empty();
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400 |
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401 | boost::system::error_code ec;
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402 |
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403 | ostringstream msg;
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404 | if (!valid)
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405 | msg << "No target address... connection attempt postponed.";
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406 | else
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407 | {
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408 | #if BOOST_VERSION < 107000
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409 | tcp::resolver resolver(get_io_service());
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410 | #else
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411 | tcp::resolver resolver(get_executor());
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412 | #endif
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413 | tcp::resolver::query query(fAddress, fPort);
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414 | tcp::resolver::iterator iterator = resolver.resolve(query, ec);
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415 |
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416 | msg << "Trying to connect to " << URL() << "...";
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417 |
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418 | // Start connection attempts (will also reset deadline counter)
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419 | if (!ec)
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420 | AsyncConnect(iterator);
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421 | else
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422 | msg << " " << ec.message() << " (" << ec << ")";
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423 | }
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424 |
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425 | // Only output message if it has changed
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426 | if (fMsgConnect!=msg.str())
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427 | {
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428 | fMsgConnect = msg.str();
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429 | if (ec)
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430 | Error(msg);
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431 | if (!ec && fVerbose)
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432 | Info(msg);
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433 | }
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434 |
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435 | if (!valid || ec)
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436 | AsyncWait(fConnectionTimer, 250, &Connection::HandleConnectionTimer);
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437 | }
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438 |
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439 | void Connection::SetEndpoint(const string &addr, int port)
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440 | {
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441 | if (fConnectionStatus>=1)
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442 | Warn("Connection or connection attempt in progress. New endpoint only valid for next connection.");
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443 |
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444 | fAddress = addr;
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445 | fPort = to_string((long long)port);
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446 | }
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447 |
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448 | void Connection::SetEndpoint(const string &addr, const string &port)
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449 | {
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450 | if (fConnectionStatus>=1 && URL()!=":")
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451 | Warn("Connection or connection attempt in progress. New endpoint only valid for next connection.");
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452 |
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453 | fAddress = addr;
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454 | fPort = port;
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455 | }
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456 |
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457 | void Connection::SetEndpoint(const string &addr)
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458 | {
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459 | const size_t p0 = addr.find_first_of(':');
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460 | const size_t p1 = addr.find_last_of(':');
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461 |
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462 | if (p0==string::npos || p0!=p1)
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463 | {
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464 | Error("Connection::SetEndpoint - Wrong format of argument '"+addr+"' ('host:port' expected)");
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465 | return;
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466 | }
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467 |
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468 | SetEndpoint(addr.substr(0, p0), addr.substr(p0+1));
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469 | }
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470 |
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471 | void Connection::SetEndpoint(const tcp::endpoint &ep)
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472 | {
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473 | const ba::ip::address addr = ep.address();
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474 |
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475 | const ba::ip::address use =
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476 | addr.is_v6() && addr.to_v6().is_loopback() ?
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477 | ba::ip::address(ba::ip::address_v4::loopback()) :
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478 | addr;
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479 |
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480 | SetEndpoint(use.to_string(), ep.port());
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481 |
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482 | fEndpoint = tcp::endpoint(use, ep.port());
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483 | }
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484 |
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485 |
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486 | Connection::Connection(ba::io_service& ioservice, ostream &out) :
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487 | MessageImp(out), tcp::socket(ioservice),
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488 | fLog(0), fVerbose(true), fDebugTx(false),
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489 | fInTimeout(ioservice), fOutTimeout(ioservice), fConnectionTimer(ioservice),
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490 | fQueueSize(0), fConnectionStatus(kDisconnected)
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491 | {
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492 | }
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