prosody
9c9c671ecc50
plugins/mod_bosh.lua

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plugins/mod_bosh.lua @ 636:9c9c671ecc50

Initial mod_bosh, works, kind of, but quite incomplete
author Matthew Wild <mwild1@gmail.com>
date Mon, 22 Dec 2008 22:19:42 +0000
child 660:b2c4a7ec31c6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
636
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1
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2 module.host = "*" -- Global module
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3
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4 local lxp = require "lxp";
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5 local init_xmlhandlers = require "core.xmlhandlers"
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6 local server = require "net.server";
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7 local httpserver = require "net.httpserver";
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8 local sm = require "core.sessionmanager";
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9 local new_uuid = require "util.uuid".generate;
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10 local fire_event = require "core.eventmanager".fire_event;
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11 local core_process_stanza = core_process_stanza;
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12 local st = require "util.stanza";
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13 local log = require "util.logger".init("bosh");
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14 local stream_callbacks = { stream_tag = "http://jabber.org/protocol/httpbind|body" };
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15
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16 local xmlns_bosh = "http://jabber.org/protocol/httpbind"; -- (hard-coded into a literal in session.send)
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17
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18 local BOSH_DEFAULT_HOLD = 1;
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19 local BOSH_DEFAULT_INACTIVITY = 30;
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20 local BOSH_DEFAULT_POLLING = 5;
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21 local BOSH_DEFAULT_REQUESTS = 2;
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22 local BOSH_DEFAULT_MAXPAUSE = 120;
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23
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24 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
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25 local os_time = os.time;
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26
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27 local sessions = {};
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28
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29 -- Used to respond to idle sessions
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30 local waiting_requests = {};
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31 function on_destroy_request(request)
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32 waiting_requests[request] = nil;
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33 end
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34
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35 function handle_request(method, body, request)
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36 if (not body) or request.method ~= "POST" then
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37 --return { status = "200 OK", headers = { ["Content-Type"] = "text/html" }, body = "<html><body>You don't look like a BOSH client to me... what do you want?</body></html>" };
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38 return "<html><body>You really don't look like a BOSH client to me... what do you want?</body></html>";
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39 end
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40 if not method then
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41 log("debug", "Request %s suffered error %s", tostring(request.id), body);
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42 return;
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43 end
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44 log("debug", "Handling new request %s: %s\n----------", request.id, tostring(body));
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45 request.notopen = true;
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46 request.log = log;
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47 local parser = lxp.new(init_xmlhandlers(request, stream_callbacks), "|");
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48
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49 parser:parse(body);
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50
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51 local session = sessions[request.sid];
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52 if session then
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53 local r = session.requests;
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54 log("debug", "Session %s has %d out of %d requests open", request.sid, #r, session.bosh_hold);
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55 log("debug", "and there are %d things in the send_buffer", #session.send_buffer);
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56 if #r > session.bosh_hold then
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57 -- We are holding too many requests, send what's in the buffer,
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58 log("debug", "We are holding too many requests, so...");
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59 if #session.send_buffer > 0 then
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60 log("debug", "...sending what is in the buffer")
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61 session.send(t_concat(session.send_buffer));
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62 session.send_buffer = {};
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63 return;
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64 else
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65 -- or an empty response
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66 log("debug", "...sending an empty response");
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67 session.send("");
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68 return;
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69 end
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70 elseif #session.send_buffer > 0 then
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71 log("debug", "Session has data in the send buffer, will send now..");
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72 local resp = t_concat(session.send_buffer);
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73 session.send_buffer = {};
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74 session.send(resp);
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75 return;
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76 end
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77
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78 if not request.destroyed and session.bosh_wait then
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79 request.reply_before = os_time() + session.bosh_wait;
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80 request.on_destroy = on_destroy_request;
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81 waiting_requests[request] = true;
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82 end
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83
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84 log("debug", "Had nothing to say, so leaving request unanswered for now");
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85 return true;
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86 end
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87 end
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88
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89 local function bosh_reset_stream(session) session.notopen = true; end
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90 local function bosh_close_stream(session, reason) end
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91
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92 function stream_callbacks.streamopened(request, attr)
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93 print("Attr:")
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94 for k,v in pairs(attr) do print("", k, v); end
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95 log("debug", "BOSH body open (sid: %s)", attr.sid);
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96 local sid = attr.sid
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97 if not sid then
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98 -- TODO: Sanity checks here (rid, to, known host, etc.)
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99 request.notopen = nil; -- Signals that we accept this opening tag
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100
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101 -- New session
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102 sid = tostring(new_uuid());
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103 local session = { type = "c2s_unauthed", conn = {}, sid = sid, rid = attr.rid, host = attr.to, bosh_version = attr.ver, bosh_wait = attr.wait, streamid = sid,
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104 bosh_hold = BOSH_DEFAULT_HOLD,
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105 requests = { }, send_buffer = {}, reset_stream = bosh_reset_stream, close = bosh_close_stream };
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106 sessions[sid] = session;
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107 log("info", "New BOSH session, assigned it sid '%s'", sid);
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108 local r, send_buffer = session.requests, session.send_buffer;
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109 local response = { }
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110 function session.send(s)
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111 log("debug", "Sending BOSH data: %s", tostring(s));
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112 local oldest_request = r[1];
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113 while oldest_request and oldest_request.destroyed do
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114 t_remove(r, 1);
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115 waiting_requests[oldest_request] = nil;
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116 oldest_request = r[1];
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117 end
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118 if oldest_request then
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119 log("debug", "We have an open request, so using that to send with");
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120 response.body = t_concat{"<body xmlns='http://jabber.org/protocol/httpbind' sid='", sid, "' xmlns:stream = 'http://etherx.jabber.org/streams'>", tostring(s), "</body>" };
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121 oldest_request:send(response);
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122 log("debug", "Sent");
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123 if oldest_request.stayopen then
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124 if #r>1 then
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125 -- Move front request to back
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126 t_insert(r, oldest_request);
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127 t_remove(r, 1);
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128 end
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129 else
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130 log("debug", "Destroying the request now...");
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131 oldest_request:destroy();
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132 t_remove(r, 1);
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133 end
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134 elseif s ~= "" then
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135 log("debug", "Saved to send buffer because there are %d open requests", #r);
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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136 -- Hmm, no requests are open :(
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137 t_insert(session.send_buffer, tostring(s));
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138 log("debug", "There are now %d things in the send_buffer", #session.send_buffer);
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139 end
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140 end
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141
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142 -- Send creation response
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143
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144 local features = st.stanza("stream:features");
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145 fire_event("stream-features", session, features);
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146 --xmpp:version='1.0' xmlns:xmpp='urn:xmpp:xbosh'
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147 local response = st.stanza("body", { xmlns = xmlns_bosh,
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148 inactivity = "30", polling = "5", requests = "2", hold = tostring(session.bosh_hold), maxpause = "120",
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149 sid = sid, ver = '1.6', from = session.host, secure = 'true', ["xmpp:version"] = "1.0",
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150 ["xmlns:xmpp"] = "urn:xmpp:xbosh", ["xmlns:stream"] = "http://etherx.jabber.org/streams" }):add_child(features);
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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151 request:send(tostring(response));
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152
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153 request.sid = sid;
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154 return;
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155 end
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156
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157 local session = sessions[sid];
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158 if not session then
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159 -- Unknown sid
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160 log("info", "Client tried to use sid '%s' which we don't know about", sid);
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161 request:send(tostring(st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", condition = "item-not-found" })));
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162 request.notopen = nil;
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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163 return;
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164 end
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165
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166 if session.notopen then
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167 local features = st.stanza("stream:features");
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168 fire_event("stream-features", session, features);
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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169 session.send(features);
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170 session.notopen = nil;
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171 end
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172
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173 request.notopen = nil; -- Signals that we accept this opening tag
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174 t_insert(session.requests, request);
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175 request.sid = sid;
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176 end
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177
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178 function stream_callbacks.handlestanza(request, stanza)
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179 log("debug", "BOSH stanza received: %s\n", stanza:pretty_print());
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180 local session = sessions[request.sid];
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181 if session then
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182 if stanza.attr.xmlns == xmlns_bosh then
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183 stanza.attr.xmlns = "jabber:client";
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184 end
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185 core_process_stanza(session, stanza);
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186 end
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187 end
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188
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189 function on_timer()
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190 log("debug", "Checking for requests soon to timeout...");
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191 -- Identify requests timing out within the next few seconds
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192 local now = os_time() + 3;
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193 for request in pairs(waiting_requests) do
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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194 if request.reply_before <= now then
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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195 log("debug", "%s was soon to timeout, sending empty response", request.id);
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196 -- Send empty response to let the
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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197 -- client know we're still here
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198 if request.conn then
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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199 sessions[request.sid].send("");
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200 end
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201 else
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202 log("debug", "%s timing out in %ds [destroyed: %s]", request.id, request.reply_before - now, tostring(request.destroyed));
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203 end
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204 if not request.on_destroy then
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205 log("warn", "%s has no on_destroy!", request.id);
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206 end
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207 end
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208 end
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209
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210 httpserver.new{ port = 5280, base = "http-bind", handler = handle_request, ssl = false}
9c9c671ecc50 Initial mod_bosh, works, kind of, but quite incomplete
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parents:
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211 server.addtimer(on_timer);