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 | */
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7 | // **************************************************************************
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8 | #include "Connection.h"
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9 |
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10 | #include <boost/bind.hpp>
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11 | #include <boost/lexical_cast.hpp>
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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 boost::lexical_cast;
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20 | using ba::ip::tcp;
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21 |
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22 |
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23 | // -------- Abbreviations for starting async tasks ---------
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24 |
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25 | int Connection::Write(const Time &t, const char *txt, int qos)
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26 | {
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27 | if (fLog)
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28 | return fLog->Write(t, txt, qos);
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29 |
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30 | return MessageImp::Write(t, txt, qos);
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31 | }
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32 |
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33 | void Connection::AsyncRead(ba::mutable_buffers_1 buffers, int type)
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34 | {
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35 | ba::async_read(*this, buffers,
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36 | boost::bind(&Connection::HandleReceivedData, this,
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37 | dummy::error, dummy::bytes_transferred, type));
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38 | }
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39 |
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40 | void Connection::AsyncWrite(ba::mutable_buffers_1 buffers)
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41 | {
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42 | ba::async_write(*this, buffers,
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43 | boost::bind(&Connection::HandleSentData, this,
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44 | dummy::error, dummy::bytes_transferred));
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45 | }
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46 |
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47 | void Connection::AsyncWait(ba::deadline_timer &timer, int millisec,
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48 | void (Connection::*handler)(const bs::error_code&))
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49 | {
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50 | // - The boost::asio::basic_deadline_timer::expires_from_now()
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51 | // function cancels any pending asynchronous waits, and returns
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52 | // the number of asynchronous waits that were cancelled. If it
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53 | // returns 0 then you were too late and the wait handler has
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54 | // already been executed, or will soon be executed. If it
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55 | // returns 1 then the wait handler was successfully cancelled.
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56 | // - If a wait handler is cancelled, the bs::error_code passed to
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57 | // it contains the value bs::error::operation_aborted.
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58 | timer.expires_from_now(boost::posix_time::milliseconds(millisec));
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59 |
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60 | timer.async_wait(boost::bind(handler, this, dummy::error));
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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 | //cout << "Start async connect(...)" << endl;
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66 | fConnectionStatus = 1;
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67 |
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68 | tcp::endpoint endpoint = *iterator;
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69 |
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70 | // AsyncConnect + Deadline
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71 | async_connect(endpoint,
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72 | boost::bind(&Connection::ConnectImp,
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73 | this, ba::placeholders::error,
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74 | ++iterator));
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75 |
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76 | // We will get a "Connection timeout anyway"
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77 | //AsyncWait(fConnectTimeout, 5, &Connection::HandleConnectTimeout);
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78 | }
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79 |
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80 | // ------------------------ close --------------------------
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81 | // close from another thread
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82 | void Connection::CloseImp(bool restart)
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83 | {
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84 | if (IsConnected())
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85 | {
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86 | stringstream str;
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87 | str << "Connection closed to " << URL() << ".";// << endl;
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88 | Message(str);
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89 | }
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90 |
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91 | // Stop any pending connection attempt
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92 | fConnectionTimer.cancel();
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93 |
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94 | // Close possible open connections
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95 | close();
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96 |
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97 | // Reset the connection status
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98 | fConnectionStatus = 0;
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99 |
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100 | // Stop deadline counters
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101 | fInTimeout.cancel();
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102 | fOutTimeout.cancel();
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103 |
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104 | if (!restart || IsConnecting())
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105 | return;
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106 |
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107 | // We need some timeout before reconnecting!
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108 | // And we have to check if we are alreayd trying to connect
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109 | // We shoudl wait until all operations in progress were canceled
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110 |
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111 | // Start trying to reconnect
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112 | fMsgConnect = "";
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113 | StartConnect();
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114 | }
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115 |
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116 | void Connection::PostClose(bool restart)
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117 | {
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118 | get_io_service().post(boost::bind(&Connection::CloseImp, this, restart));
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119 | }
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120 |
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121 | // ------------------------ write --------------------------
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122 | void Connection::HandleWriteTimeout(const bs::error_code &error)
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123 | {
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124 | // 125: Operation canceled
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125 | if (error && error!=bs::error_code(125, bs::system_category))
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126 | {
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127 | stringstream str;
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128 | str << "Write timeout of " << URL() << ": " << error.message() << " (" << error << ")";// << endl;
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129 | Error(str);
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130 | }
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131 |
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132 | if (!is_open())
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133 | {
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134 | // For example: Here we could schedule a new accept if we
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135 | // would not want to allow two connections at the same time.
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136 | return;
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137 | }
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138 |
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139 | // Check whether the deadline has passed. We compare the deadline
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140 | // against the current time since a new asynchronous operation
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141 | // may have moved the deadline before this actor had a chance
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142 | // to run.
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143 | if (fOutTimeout.expires_at() > ba::deadline_timer::traits_type::now())
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144 | return;
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145 |
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146 | Error("fOutTimeout has expired, writing data to "+URL());
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147 |
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148 | CloseImp();
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149 | }
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150 |
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151 | void Connection::HandleSentData(const bs::error_code& error, size_t)
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152 | {
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153 | if (error)
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154 | {
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155 | stringstream str;
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156 | str << "Writing to " << URL() << ": " << error.message() << " (" << error << ")";// << endl;
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157 | Error(str);
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158 |
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159 | CloseImp();
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160 | return;
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161 | }
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162 |
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163 | Message("Data successfully sent to "+URL());
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164 |
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165 | // This is "thread" safe because SendMessage and HandleSentMessage
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166 | // are serialized in the EventQueue. Note: Do not call these
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167 | // functions directly from any other place then Handlers, use
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168 | // PostMessage instead
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169 | fOutQueue.pop_front();
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170 |
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171 | if (fOutQueue.empty())
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172 | {
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173 | // Queue went empty, remove deadline
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174 | fOutTimeout.cancel();
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175 | return;
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176 | }
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177 |
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178 | // AsyncWrite + Deadline
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179 | AsyncWrite(ba::buffer(fOutQueue.front())/*, &Connection::HandleSentData*/);
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180 | AsyncWait(fOutTimeout, 5000, &Connection::HandleWriteTimeout);
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181 | }
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182 |
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183 | void Connection::SendMessageImp(const vector<char> &msg)
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184 | {
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185 | /*
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186 | if (!fConnectionEstablished)
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187 | {
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188 | UpdateWarn("SendMessageImp, but no connection to "+fAddress+":"+fPort+".");
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189 | return;
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190 | }*/
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191 |
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192 | const bool first_message_in_queue = fOutQueue.empty();
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193 |
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194 | // This is "thread" safe because SendMessage and HandleSentMessage
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195 | // are serialized in the EventQueue. Note: Do not call these
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196 | // functions directly from any other place then Handlers, use
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197 | // PostMessage instead
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198 | fOutQueue.push_back(msg);
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199 |
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200 | if (!first_message_in_queue)
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201 | return;
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202 |
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203 | // AsyncWrite + Deadline
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204 | AsyncWrite(ba::buffer(fOutQueue.front())/*, &Connection::HandleSentData*/);
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205 | AsyncWait(fOutTimeout, 5000, &Connection::HandleWriteTimeout);
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206 | }
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207 |
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208 | void Connection::PostMessage(vector<uint16_t> inp)
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209 | {
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210 | // Convert to network byte order
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211 | for_each(inp.begin(), inp.end(), htons);
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212 |
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213 | // FIXME FIXME
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214 |
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215 | PostMessage((char*)&inp.front(), sizeof(uint16_t)*inp.size());
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216 |
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217 | // const vector<char> msg((char*)&inp.front(), (char*)&inp.last()+1);
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218 | // get_io_service().post(boost::bind(&Connection::SendMessageImp, this, msg));
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219 | }
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220 |
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221 | void Connection::PostMessage(const vector<char> &msg)
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222 | {
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223 | get_io_service().post(boost::bind(&Connection::SendMessageImp, this, msg));
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224 | }
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225 |
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226 | void Connection::PostMessage(const void *ptr, size_t max)
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227 | {
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228 | const vector<char> msg(reinterpret_cast<const char*>(ptr),
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229 | reinterpret_cast<const char*>(ptr)+max);
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230 |
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231 | get_io_service().post(boost::bind(&Connection::SendMessageImp, this, msg));
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232 | }
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233 |
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234 | void Connection::PostMessage(const string &cmd, size_t max)
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235 | {
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236 | if (max==size_t(-1))
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237 | max = cmd.length()+1;
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238 |
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239 | vector <char>msg(max);
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240 |
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241 | for (unsigned int i=0; i<max; i++)
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242 | msg[i] = 0;
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243 |
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244 | for (unsigned int i=0; i<min(cmd.length()+1, max); i++)
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245 | msg[i] = cmd[i];
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246 |
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247 | get_io_service().post(boost::bind(&Connection::SendMessageImp, this, msg));
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248 | }
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249 |
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250 | void Connection::HandleConnectionTimer(const bs::error_code &error)
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251 | {
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252 | // 125: Operation canceled
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253 | if (error && error!=bs::error_code(125, bs::system_category))
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254 | {
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255 | stringstream str;
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256 | str << "Connetion timer of " << URL() << ": " << error.message() << " (" << error << ")";// << endl;
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257 | Error(str);
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258 | }
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259 |
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260 | if (is_open())
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261 | {
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262 | // For example: Here we could schedule a new accept if we
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263 | // would not want to allow two connections at the same time.
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264 | return;
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265 | }
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266 |
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267 | // Check whether the deadline has passed. We compare the deadline
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268 | // against the current time since a new asynchronous operation
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269 | // may have moved the deadline before this actor had a chance
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270 | // to run.
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271 | if (fConnectionTimer.expires_at() < ba::deadline_timer::traits_type::now())
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272 | StartConnect();
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273 | }
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274 |
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275 | void Connection::ConnectImp(const bs::error_code& error,
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276 | tcp::resolver::iterator endpoint_iterator)
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277 | {
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278 | // Connection established
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279 | if (!error)
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280 | {
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281 | Message("Connection established to "+URL()+"...");
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282 |
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283 | // Initialize hardware...
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284 | // Set state to : connected/undefined until we get the first message
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285 | // (send request for configuration) ?
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286 | // (send configuration?)
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287 | fMsgConnect = "";
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288 | fErrConnect = "";
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289 |
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290 | fConnectionStatus = 2;
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291 | //StartAsyncRead();
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292 |
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293 | // We can create the buffer here and delete it in
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294 | // Handle Read. However, the read buffer is not filled again
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295 | // before it was not read within HandleReceivedData -- so a single
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296 | // buffer should be good enough. Before HandleReceivedData
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297 | // returns the data must be copied to a "safe" place.
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298 |
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299 | // fSocket.get_io_service()/*fEventQueue*/.stop();
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300 |
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301 | ConnectionEstablished();
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302 | return;
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303 | }
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304 |
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305 | // If returning from run will lead to deletion of this
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306 | // instance, close() is not needed (maybe implicitly called).
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307 | // If run is called again, close() is needed here. Otherwise:
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308 | // Software caused connection abort when we try to resolve
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309 | // the endpoint again.
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310 | CloseImp(false);
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311 | //fSocket.close();
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312 |
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313 | // 111: Connection refused
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314 | if (1/*error!=bs::error_code(111, bs::system_category)*/)
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315 | {
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316 | stringstream msg;
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317 | if (URL()!=":")
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318 | msg << "Connecting to " << URL() << ": " << error.message() << " (" << error << ")";
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319 |
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320 | if (fErrConnect!=msg.str())
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321 | {
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322 | fMsgConnect = "";
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323 | fErrConnect = msg.str();
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324 | Warn(fErrConnect);
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325 | }
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326 | }
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327 |
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328 | // Go on with the next
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329 | if (endpoint_iterator != tcp::resolver::iterator())
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330 | {
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331 | AsyncConnect(endpoint_iterator);
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332 | return;
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333 | }
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334 |
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335 | // No more entries to try, if we would not put anything else
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336 | // into the queue anymore it would now return (run() would return)
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337 |
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338 | // Since we don't want to block the main loop, we wait using an
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339 | // asnychronous timer
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340 |
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341 | // FIXME: Should we move this before AsyncConnect() ?
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342 | AsyncWait(fConnectionTimer, 250, &Connection::HandleConnectionTimer);
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343 | }
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344 |
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345 | // FIXME: Async connect should get address and port as an argument
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346 | void Connection::StartConnect()
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347 | {
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348 | fConnectionStatus = 1;
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349 |
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350 | tcp::resolver resolver(get_io_service());
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351 |
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352 | boost::system::error_code ec;
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353 |
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354 | tcp::resolver::query query(fAddress, fPort);
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355 | tcp::resolver::iterator iterator = resolver.resolve(query, ec);
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356 |
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357 | stringstream msg;
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358 | if (!fAddress.empty() || !fPort.empty() || ec)
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359 | msg << "Trying to connect to " << URL() << "...";
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360 |
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361 | if (ec)
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362 | msg << " " << ec.message() << " (" << ec << ")";
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363 |
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364 | // Only output message if it has changed
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365 | if (fMsgConnect!=msg.str())
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366 | {
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367 | fMsgConnect = msg.str();
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368 | ec ? Error(msg) : Message(msg);
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369 | }
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370 |
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371 | if (ec)
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372 | AsyncWait(fConnectionTimer, 250, &Connection::HandleConnectionTimer);
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373 | else
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374 | // Start connection attempts (will also reset deadline counter)
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375 | AsyncConnect(iterator);
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376 | }
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377 |
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378 | void Connection::SetEndpoint(const string &addr, int port)
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379 | {
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380 | if (fConnectionStatus>=1)
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381 | Warn("Connection or connection attempt in progress. New endpoint only valid for next connection.");
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382 |
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383 | fAddress = addr;
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384 | fPort = lexical_cast<string>(port);
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385 | }
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386 |
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387 | void Connection::SetEndpoint(const string &addr, const string &port)
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388 | {
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389 | if (fConnectionStatus>=1 && URL()!=":")
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390 | Warn("Connection or connection attempt in progress. New endpoint only valid for next connection.");
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391 |
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392 | fAddress = addr;
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393 | fPort = port;
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394 | }
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395 |
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396 | void Connection::SetEndpoint(const string &addr)
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397 | {
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398 | const size_t p0 = addr.find_first_of(':');
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399 | const size_t p1 = addr.find_last_of(':');
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400 |
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401 | if (p0==string::npos || p0!=p1)
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402 | {
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403 | Error("Connection::SetEndPoint - Wrong format of argument.");
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404 | return;
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405 | }
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406 |
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407 | SetEndpoint(addr.substr(0, p0), addr.substr(p0+1));
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408 | }
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409 |
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410 |
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411 |
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412 | Connection::Connection(ba::io_service& ioservice, ostream &out) :
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413 | MessageImp(out), tcp::socket(ioservice),
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414 | fLog(0), //fAddress("localhost"), fPort("5000"),
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415 | fInTimeout(ioservice), fOutTimeout(ioservice), fConnectionTimer(ioservice),
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416 | fConnectionStatus(0)
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417 | {
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418 | }
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419 | /*
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420 | Connection::Connection(ba::io_service& ioservice, const string &addr, int port) :
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421 | tcp::socket(ioservice),
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422 | fLog(0), fAddress(addr), fPort(lexical_cast<string>(port)),
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423 | fInTimeout(ioservice), fOutTimeout(ioservice), fConnectionTimer(ioservice),
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424 | fConnectionStatus(0)
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425 | {
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426 | }
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427 |
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428 | Connection::Connection(ba::io_service& ioservice, const string &addr, const string &port) :
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429 | tcp::socket(ioservice), fLog(0), fAddress(addr), fPort(port),
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430 | fInTimeout(ioservice), fOutTimeout(ioservice), fConnectionTimer(ioservice),
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431 | fConnectionStatus(0)
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432 | {
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433 | }
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434 | */
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