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annotate plugins/links/links.cpp @ 706:bd7feaa002cb

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Irccd: check ABI compatibility in dynlib_plugin
author David Demelier <markand@malikania.fr>
date Fri, 06 Jul 2018 19:32:54 +0200
parents 4b5dba257d81
children 48afa8c41f50
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rev   line source
705
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1 /*
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2 * links.cpp -- links plugin
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3 *
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4 * Copyright (c) 2013-2018 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <memory>
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20 #include <regex>
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21 #include <sstream>
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22 #include <string>
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23 #include <variant>
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24
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25 #include <boost/algorithm/string/trim_all.hpp>
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26
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27 #include <boost/dll.hpp>
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28
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29 #include <boost/asio.hpp>
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30 #include <boost/asio/ssl.hpp>
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31
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32 #include <boost/beast.hpp>
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33
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34 #include <irccd/string_util.hpp>
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35
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36 #include <irccd/daemon/irc.hpp>
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37 #include <irccd/daemon/irccd.hpp>
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38 #include <irccd/daemon/plugin.hpp>
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39 #include <irccd/daemon/server.hpp>
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40
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41 using boost::asio::async_connect;
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42 using boost::asio::deadline_timer;
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43 using boost::asio::io_context;
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44 using boost::asio::ip::tcp;
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45 using boost::asio::ssl::context;
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46 using boost::asio::ssl::stream;
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47 using boost::asio::ssl::stream_base;
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48
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49 using boost::beast::flat_buffer;
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50 using boost::beast::http::async_read;
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51 using boost::beast::http::async_write;
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52 using boost::beast::http::empty_body;
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53 using boost::beast::http::field;
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54 using boost::beast::http::request;
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55 using boost::beast::http::response;
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56 using boost::beast::http::string_body;
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57 using boost::beast::http::verb;
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58 using boost::beast::http::status;
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59
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60 using boost::posix_time::seconds;
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61 using boost::system::error_code;
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62
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63 using std::get;
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64 using std::enable_shared_from_this;
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65 using std::monostate;
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66 using std::move;
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67 using std::regex;
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68 using std::regex_match;
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69 using std::regex_search;
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70 using std::shared_ptr;
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71 using std::smatch;
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72 using std::string;
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73 using std::variant;
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74
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75 namespace irccd {
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76
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77 namespace {
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78
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79 // {{{ globals
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80
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81 // User options.
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82 struct config {
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83 static inline unsigned timeout{30U};
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84 };
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85
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86 // User formats.
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87 struct formats {
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88 static inline string info{"#{title}"};
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89 };
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90
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91 // }}}
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92
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93 // {{{ url
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94
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95 struct url {
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96 string protocol;
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97 string host;
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98 string path{"/"};
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99
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100 static auto parse(const string&) -> url;
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101 };
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102
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103 auto url::parse(const string& link) -> url
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104 {
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105 static const regex regex("^(https?):\\/\\/([^\\/\\?]+)(.*)$");
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106
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107 url ret;
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108
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109 if (smatch match; regex_match(link, match, regex)) {
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110 ret.protocol = match[1];
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111 ret.host = match[2];
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112
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113 if (match.length(3) > 0)
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114 ret.path = match[3];
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115 if (ret.path[0] != '/')
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116 ret.path.insert(ret.path.begin(), '/');
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117 }
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118
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119 return ret;
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120 }
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121
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122 // }}}
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123
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124 // {{{ requester
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125
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126 class requester : public enable_shared_from_this<requester> {
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127 private:
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128 using socket = variant<monostate, tcp::socket, stream<tcp::socket>>;
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129
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130 shared_ptr<server> server_;
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131 string channel_;
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132 string origin_;
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133
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134 url url_;
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135 context ctx_{context::sslv23};
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136 socket socket_;
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137 flat_buffer buffer_;
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138 request<empty_body> req_;
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139 response<string_body> res_;
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140 deadline_timer timer_;
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141 tcp::resolver resolver_;
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142
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143 void notify(const string&);
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144 void parse();
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145 void handle_read(const error_code&);
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146 void read();
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147 void handle_write(const error_code&);
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148 void write();
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149 void handle_handshake(const error_code&);
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150 void handshake();
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151 void handle_connect(const error_code&);
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152 void connect(const tcp::resolver::results_type&);
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153 void handle_resolve(const error_code&, const tcp::resolver::results_type&);
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154 void resolve();
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155 void handle_timer(const error_code&);
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156 void timer();
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157 void start();
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158
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159 requester(io_context&, shared_ptr<server>, string, string, url);
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160
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161 public:
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162 static void run(io_context&, const message_event&);
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163 };
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164
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165 void requester::notify(const string& title)
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166 {
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167 string_util::subst subst;
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168
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169 subst.keywords.emplace("channel", channel_);
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170 subst.keywords.emplace("nickname", irc::user::parse(origin_).nick());
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171 subst.keywords.emplace("origin", origin_);
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172 subst.keywords.emplace("server", server_->get_name());
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173 subst.keywords.emplace("title", title);
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174
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175 server_->message(channel_, format(formats::info, subst));
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176 }
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177
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178 void requester::parse()
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179 {
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180 /*
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181 * Use a regex because Boost's XML parser is strict and many web pages may
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182 * have invalid or broken tags.
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183 */
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184 static const regex regex("<title>([^<]+)<\\/title>");
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185
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186 string data(res_.body().data());
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187 smatch match;
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188
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189 if (regex_search(data, match, regex))
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190 notify(match[1]);
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191 }
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192
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193 void requester::handle_read(const error_code& code)
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194 {
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195 timer_.cancel();
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196
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197 if (code)
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198 return;
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199
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200 // Request again in case of relocation.
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201 if (res_.result() == status::moved_permanently) {
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202 const string host(res_[field::location].data());
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203
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204 // Clean '\r\n'
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205 url_ = url::parse(boost::algorithm::trim_all_copy(host));
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206 start();
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207 } else
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208 parse();
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209 }
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210
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211 void requester::read()
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212 {
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213 const auto self = shared_from_this();
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214 const auto wrap = [self] (auto code, auto) {
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215 self->handle_read(code);
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216 };
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217
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218 timer();
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219
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220 switch (socket_.index()) {
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221 case 1:
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222 async_read(get<1>(socket_), buffer_, res_, wrap);
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223 break;
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224 case 2:
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225 async_read(get<2>(socket_), buffer_, res_, wrap);
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226 break;
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227 default:
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228 break;
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229 }
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230 }
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231
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232 void requester::handle_write(const error_code& code)
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233 {
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234 timer_.cancel();
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235
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236 if (!code)
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237 read();
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238 }
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239
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240 void requester::write()
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241 {
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242 req_.version(11);
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243 req_.method(verb::get);
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244 req_.target(url_.path);
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245 req_.set(field::host, url_.host);
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246 req_.set(field::user_agent, BOOST_BEAST_VERSION_STRING);
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247
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248 const auto self = shared_from_this();
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249 const auto wrap = [self] (auto code, auto) {
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250 self->handle_write(code);
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251 };
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252
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253 timer();
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254
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255 switch (socket_.index()) {
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256 case 1:
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257 async_write(get<1>(socket_), req_, wrap);
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258 break;
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259 case 2:
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260 async_write(get<2>(socket_), req_, wrap);
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261 break;
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262 default:
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263 break;
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264 }
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265 }
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266
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267 void requester::handle_handshake(const error_code& code)
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268 {
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269 timer_.cancel();
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270
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271 if (!code)
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272 write();
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273 }
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274
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275 void requester::handshake()
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276 {
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277 const auto self = shared_from_this();
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278
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279 timer();
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280
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281 switch (socket_.index()) {
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282 case 1:
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283 handle_handshake(error_code());
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284 break;
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285 case 2:
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286 get<2>(socket_).async_handshake(stream_base::client, [self] (auto code) {
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287 self->handle_handshake(code);
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288 });
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289 break;
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290 default:
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291 break;
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292 }
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293 }
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294
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295 void requester::handle_connect(const error_code& code)
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296 {
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297 timer_.cancel();
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298
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299 if (!code)
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300 handshake();
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301 }
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302
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303 void requester::connect(const tcp::resolver::results_type& eps)
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304 {
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305 const auto self = shared_from_this();
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306 const auto wrap = [self] (auto code, auto) {
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307 self->handle_connect(code);
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308 };
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309
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310 timer();
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311
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312 switch (socket_.index()) {
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313 case 1:
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314 async_connect(get<1>(socket_), eps, wrap);
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315 break;
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316 case 2:
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317 async_connect(get<2>(socket_).lowest_layer(), eps, wrap);
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318 break;
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319 default:
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320 break;
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321 }
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322 }
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323
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324 void requester::handle_resolve(const error_code& code, const tcp::resolver::results_type& eps)
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325 {
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326 timer_.cancel();
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327
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328 if (!code)
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329 connect(eps);
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330 }
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331
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332 void requester::resolve()
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333 {
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334 auto self = shared_from_this();
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335
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336 timer();
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337 resolver_.async_resolve(url_.host, url_.protocol, [self] (auto code, auto eps) {
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338 self->handle_resolve(code, eps);
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339 });
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340 }
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341
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342 void requester::handle_timer(const error_code& code)
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343 {
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344 // Force close sockets to cancel all pending operations.
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345 if (code && code != boost::asio::error::operation_aborted)
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346 socket_.emplace<monostate>();
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347 }
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348
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349 void requester::timer()
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350 {
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351 const auto self = shared_from_this();
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352
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353 timer_.expires_from_now(seconds(config::timeout));
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354 timer_.async_wait([self] (auto code) {
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355 self->handle_timer(code);
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356 });
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357 }
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358
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359 void requester::start()
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360 {
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361 if (url_.protocol == "http")
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362 socket_.emplace<tcp::socket>(resolver_.get_io_service());
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363 else
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364 socket_.emplace<stream<tcp::socket>>(resolver_.get_io_service(), ctx_);
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365
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366 resolve();
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367 }
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368
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369 requester::requester(io_context& io,
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370 shared_ptr<server> server,
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371 string channel,
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372 string origin,
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373 url url)
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374 : server_(move(server))
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375 , channel_(move(channel))
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376 , origin_(move(origin))
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377 , url_(move(url))
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378 , timer_(io)
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379 , resolver_(io)
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380 {
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381 }
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382
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383 void requester::run(io_context& io, const message_event& ev)
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parents:
diff changeset
384 {
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385 auto url = url::parse(ev.message);
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386
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387 if (url.protocol.empty() || url.host.empty())
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parents:
diff changeset
388 return;
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389
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390 shared_ptr<requester>(new requester(io, ev.server, ev.channel, ev.origin, move(url)))->start();
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parents:
diff changeset
391 }
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392
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393 // }}}
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394
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395 // {{{ links_plugin
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396
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397 class links_plugin : public plugin {
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parents:
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398 public:
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parents:
diff changeset
399 using plugin::plugin;
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diff changeset
400
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401 void set_config(plugin_config) override;
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David Demelier <markand@malikania.fr>
parents:
diff changeset
402 void set_formats(plugin_formats) override;
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diff changeset
403 void handle_message(irccd&, const message_event&) override;
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parents:
diff changeset
404 };
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parents:
diff changeset
405
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parents:
diff changeset
406 void links_plugin::set_config(plugin_config conf)
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David Demelier <markand@malikania.fr>
parents:
diff changeset
407 {
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parents:
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408 if (const auto v = string_util::to_uint(conf["timeout"]); v)
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parents:
diff changeset
409 config::timeout = *v;
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parents:
diff changeset
410 }
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David Demelier <markand@malikania.fr>
parents:
diff changeset
411
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David Demelier <markand@malikania.fr>
parents:
diff changeset
412 void links_plugin::set_formats(plugin_formats formats)
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David Demelier <markand@malikania.fr>
parents:
diff changeset
413 {
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parents:
diff changeset
414 if (const auto it = formats.find("info"); it != formats.end())
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parents:
diff changeset
415 formats::info = it->second;
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parents:
diff changeset
416 }
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David Demelier <markand@malikania.fr>
parents:
diff changeset
417
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parents:
diff changeset
418 void links_plugin::handle_message(irccd& irccd, const message_event& ev)
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parents:
diff changeset
419 {
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diff changeset
420 requester::run(irccd.get_service(), ev);
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parents:
diff changeset
421 }
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parents:
diff changeset
422
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David Demelier <markand@malikania.fr>
parents:
diff changeset
423 // }}}
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parents:
diff changeset
424
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David Demelier <markand@malikania.fr>
parents:
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425 } // !namespace
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parents:
diff changeset
426
706
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
David Demelier <markand@malikania.fr>
parents: 705
diff changeset
427 extern "C" {
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
David Demelier <markand@malikania.fr>
parents: 705
diff changeset
428
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
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parents: 705
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429 BOOST_SYMBOL_EXPORT
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
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parents: 705
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430 auto irccd_abi_links() -> unsigned
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parents: 705
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431 {
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
David Demelier <markand@malikania.fr>
parents: 705
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432 return IRCCD_VERSION_SHLIB;
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
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parents: 705
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433 }
705
4b5dba257d81 Plugin links: brand new plugin, closes #872 @4h
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parents:
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434
706
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
David Demelier <markand@malikania.fr>
parents: 705
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435 BOOST_SYMBOL_EXPORT
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David Demelier <markand@malikania.fr>
parents: 705
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436 auto irccd_init_links() -> std::unique_ptr<plugin>
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
David Demelier <markand@malikania.fr>
parents: 705
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437 {
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
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parents: 705
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438 return std::make_unique<links_plugin>("links", "");
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
David Demelier <markand@malikania.fr>
parents: 705
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439 }
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
David Demelier <markand@malikania.fr>
parents: 705
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440
bd7feaa002cb Irccd: check ABI compatibility in dynlib_plugin
David Demelier <markand@malikania.fr>
parents: 705
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441 } // !C
705
4b5dba257d81 Plugin links: brand new plugin, closes #872 @4h
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parents:
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442
4b5dba257d81 Plugin links: brand new plugin, closes #872 @4h
David Demelier <markand@malikania.fr>
parents:
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443 } // !irccd