Sat, 17 Jan 2009 04:45:08 +0000
Port to new server.lua, quite some changes, but I believe everything to be working
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Initial mod_bosh, works, kind of, but quite incomplete
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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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Numerous BOSH improvements... handle client disconnects, either explicit or implicit through inactivity; allow specifying BOSH default parameters through config; fix to prevent prematurely closing request connections in some cases, before they were replied to
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9 | local sm_destroy_session = sm.destroy_session; |
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10 | local new_uuid = require "util.uuid".generate; |
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11 | local fire_event = require "core.eventmanager".fire_event; |
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12 | local core_process_stanza = core_process_stanza; |
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13 | local st = require "util.stanza"; |
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14 | local log = require "util.logger".init("bosh"); |
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15 | local stream_callbacks = { stream_tag = "http://jabber.org/protocol/httpbind|body" }; |
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Numerous BOSH improvements... handle client disconnects, either explicit or implicit through inactivity; allow specifying BOSH default parameters through config; fix to prevent prematurely closing request connections in some cases, before they were replied to
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16 | local config = require "core.configmanager"; |
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17 | local xmlns_bosh = "http://jabber.org/protocol/httpbind"; -- (hard-coded into a literal in session.send) |
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18 | |
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19 | local BOSH_DEFAULT_HOLD = tonumber(config.get("*", "core", "bosh_default_hold")) or 1; |
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20 | local BOSH_DEFAULT_INACTIVITY = tonumber(config.get("*", "core", "bosh_max_inactivity")) or 60; |
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21 | local BOSH_DEFAULT_POLLING = tonumber(config.get("*", "core", "bosh_max_polling")) or 5; |
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Numerous BOSH improvements... handle client disconnects, either explicit or implicit through inactivity; allow specifying BOSH default parameters through config; fix to prevent prematurely closing request connections in some cases, before they were replied to
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22 | local BOSH_DEFAULT_REQUESTS = tonumber(config.get("*", "core", "bosh_max_requests")) or 2; |
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23 | local BOSH_DEFAULT_MAXPAUSE = tonumber(config.get("*", "core", "bosh_max_pause")) or 300; |
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24 | |
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25 | local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat; |
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26 | local os_time = os.time; |
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27 | |
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28 | local sessions = {}; |
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29 | local inactive_sessions = {}; -- Sessions which have no open requests |
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30 | |
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Numerous BOSH improvements... handle client disconnects, either explicit or implicit through inactivity; allow specifying BOSH default parameters through config; fix to prevent prematurely closing request connections in some cases, before they were replied to
Matthew Wild <mwild1@gmail.com>
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31 | -- Used to respond to idle sessions (those with waiting requests) |
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32 | local waiting_requests = {}; |
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33 | function on_destroy_request(request) |
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34 | waiting_requests[request] = nil; |
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35 | end |
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36 | |
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37 | function handle_request(method, body, request) |
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38 | if (not body) or request.method ~= "POST" then |
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39 | return "<html><body>You really don't look like a BOSH client to me... what do you want?</body></html>"; |
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40 | end |
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41 | if not method then |
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42 | log("debug", "Request %s suffered error %s", tostring(request.id), body); |
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43 | return; |
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44 | end |
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45 | log("debug", "Handling new request %s: %s\n----------", request.id, tostring(body)); |
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46 | request.notopen = true; |
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47 | request.log = log; |
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48 | local parser = lxp.new(init_xmlhandlers(request, stream_callbacks), "|"); |
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49 | |
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50 | parser:parse(body); |
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51 | |
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52 | local session = sessions[request.sid]; |
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53 | if session then |
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54 | local r = session.requests; |
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55 | log("debug", "Session %s has %d out of %d requests open", request.sid, #r, session.bosh_hold); |
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56 | log("debug", "and there are %d things in the send_buffer", #session.send_buffer); |
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57 | if #r > session.bosh_hold then |
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58 | -- We are holding too many requests, send what's in the buffer, |
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59 | log("debug", "We are holding too many requests, so..."); |
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60 | if #session.send_buffer > 0 then |
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61 | log("debug", "...sending what is in the buffer") |
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62 | session.send(t_concat(session.send_buffer)); |
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63 | session.send_buffer = {}; |
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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 | end |
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69 | elseif #session.send_buffer > 0 then |
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70 | log("debug", "Session has data in the send buffer, will send now.."); |
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71 | local resp = t_concat(session.send_buffer); |
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72 | session.send_buffer = {}; |
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73 | session.send(resp); |
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74 | end |
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75 | |
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76 | if not request.destroyed and session.bosh_wait then |
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77 | request.reply_before = os_time() + session.bosh_wait; |
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78 | request.on_destroy = on_destroy_request; |
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79 | waiting_requests[request] = true; |
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80 | end |
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81 | |
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82 | log("debug", "Had nothing to say, so leaving request unanswered for now"); |
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83 | return true; |
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84 | end |
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85 | end |
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86 | |
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87 | |
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88 | local function bosh_reset_stream(session) session.notopen = true; end |
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89 | |
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90 | local session_close_reply = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate" }); |
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91 | local function bosh_close_stream(session, reason) |
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92 | (session.log or log)("info", "BOSH client disconnected"); |
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93 | session_close_reply.attr.condition = reason; |
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94 | local session_close_reply = tostring(session_close_reply); |
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95 | for _, held_request in ipairs(session.requests) do |
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96 | held_request:send(session_close_reply); |
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97 | held_request:destroy(); |
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98 | end |
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99 | sessions[session.sid] = nil; |
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100 | sm_destroy_session(session); |
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101 | end |
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102 | |
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103 | function stream_callbacks.streamopened(request, attr) |
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104 | print("Attr:") |
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105 | for k,v in pairs(attr) do print("", k, v); end |
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106 | log("debug", "BOSH body open (sid: %s)", attr.sid); |
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107 | local sid = attr.sid |
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108 | if not sid then |
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109 | -- New session request |
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110 | request.notopen = nil; -- Signals that we accept this opening tag |
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111 | |
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112 | -- TODO: Sanity checks here (rid, to, known host, etc.) |
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113 | if not hosts[attr.to] then |
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114 | -- Unknown host |
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115 | session_close_reply.attr.condition = "host-unknown"; |
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116 | request:send(tostring(session_close_reply)); |
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117 | request.notopen = nil |
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118 | return; |
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119 | end |
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120 | |
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121 | -- New session |
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122 | sid = tostring(new_uuid()); |
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123 | 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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124 | bosh_hold = BOSH_DEFAULT_HOLD, bosh_max_inactive = BOSH_DEFAULT_INACTIVITY, |
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125 | requests = { }, send_buffer = {}, reset_stream = bosh_reset_stream, close = bosh_close_stream, dispatch_stanza = core_process_stanza }; |
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126 | sessions[sid] = session; |
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127 | log("info", "New BOSH session, assigned it sid '%s'", sid); |
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128 | local r, send_buffer = session.requests, session.send_buffer; |
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129 | local response = { } |
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130 | function session.send(s) |
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131 | log("debug", "Sending BOSH data: %s", tostring(s)); |
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132 | local oldest_request = r[1]; |
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133 | while oldest_request and oldest_request.destroyed do |
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134 | t_remove(r, 1); |
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135 | waiting_requests[oldest_request] = nil; |
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136 | oldest_request = r[1]; |
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137 | end |
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138 | if oldest_request then |
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139 | log("debug", "We have an open request, so using that to send with"); |
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140 | 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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141 | oldest_request:send(response); |
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142 | log("debug", "Sent"); |
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143 | if oldest_request.stayopen then |
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144 | if #r>1 then |
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145 | -- Move front request to back |
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146 | t_insert(r, oldest_request); |
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147 | t_remove(r, 1); |
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148 | end |
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149 | else |
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150 | log("debug", "Destroying the request now..."); |
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151 | oldest_request:destroy(); |
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152 | t_remove(r, 1); |
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153 | end |
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154 | elseif s ~= "" then |
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155 | log("debug", "Saved to send buffer because there are %d open requests", #r); |
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156 | if session.bosh_max_inactive and not inactive_sessions[session] then |
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157 | inactive_sessions[session] = os_time(); |
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158 | (session.log or log)("debug", "BOSH session marked as inactive at %d", inactive_sessions[session]); |
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159 | end |
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160 | -- Hmm, no requests are open :( |
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161 | t_insert(session.send_buffer, tostring(s)); |
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162 | log("debug", "There are now %d things in the send_buffer", #session.send_buffer); |
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163 | end |
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164 | end |
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165 | |
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166 | -- Send creation response |
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167 | |
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168 | local features = st.stanza("stream:features"); |
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169 | fire_event("stream-features", session, features); |
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170 | --xmpp:version='1.0' xmlns:xmpp='urn:xmpp:xbosh' |
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171 | local response = st.stanza("body", { xmlns = xmlns_bosh, |
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172 | inactivity = tostring(BOSH_DEFAULT_INACTIVITY), polling = tostring(BOSH_DEFAULT_POLLING), requests = tostring(BOSH_DEFAULT_REQUESTS), hold = tostring(session.bosh_hold), maxpause = "120", |
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173 | sid = sid, ver = '1.6', from = session.host, secure = 'true', ["xmpp:version"] = "1.0", |
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174 | ["xmlns:xmpp"] = "urn:xmpp:xbosh", ["xmlns:stream"] = "http://etherx.jabber.org/streams" }):add_child(features); |
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175 | request:send(tostring(response)); |
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176 | |
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177 | request.sid = sid; |
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178 | return; |
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179 | end |
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180 | |
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181 | local session = sessions[sid]; |
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182 | if not session then |
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183 | -- Unknown sid |
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184 | log("info", "Client tried to use sid '%s' which we don't know about", sid); |
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185 | request:send(tostring(st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", condition = "item-not-found" }))); |
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186 | request.notopen = nil; |
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187 | return; |
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188 | end |
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189 | |
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190 | if attr.type == "terminate" then |
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191 | -- Client wants to end this session |
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192 | session:close(); |
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193 | request.notopen = nil; |
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194 | return; |
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195 | end |
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196 | |
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197 | -- If session was inactive, make sure it is now marked as not |
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198 | if #session.requests == 0 then |
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199 | (session.log or log)("debug", "BOSH client now active again at %d", os_time()); |
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200 | inactive_sessions[session] = nil; |
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201 | end |
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202 | |
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203 | if session.notopen then |
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204 | local features = st.stanza("stream:features"); |
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205 | fire_event("stream-features", session, features); |
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206 | session.send(features); |
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207 | session.notopen = nil; |
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208 | end |
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209 | |
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210 | request.notopen = nil; -- Signals that we accept this opening tag |
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211 | t_insert(session.requests, request); |
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212 | request.sid = sid; |
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213 | end |
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214 | |
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215 | function stream_callbacks.handlestanza(request, stanza) |
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216 | log("debug", "BOSH stanza received: %s\n", stanza:top_tag()); |
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217 | local session = sessions[request.sid]; |
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218 | if session then |
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219 | if stanza.attr.xmlns == xmlns_bosh then |
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220 | stanza.attr.xmlns = "jabber:client"; |
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221 | end |
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222 | core_process_stanza(session, stanza); |
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223 | end |
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224 | end |
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225 | |
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226 | function on_timer() |
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227 | -- log("debug", "Checking for requests soon to timeout..."); |
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228 | -- Identify requests timing out within the next few seconds |
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229 | local now = os_time() + 3; |
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230 | for request in pairs(waiting_requests) do |
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231 | if request.reply_before <= now then |
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232 | log("debug", "%s was soon to timeout, sending empty response", request.id); |
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233 | -- Send empty response to let the |
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234 | -- client know we're still here |
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235 | if request.conn then |
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236 | sessions[request.sid].send(""); |
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237 | end |
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238 | end |
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239 | end |
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240 | |
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241 | now = now - 3; |
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242 | for session, inactive_since in pairs(inactive_sessions) do |
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243 | if session.bosh_max_inactive then |
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244 | if now - inactive_since > session.bosh_max_inactive then |
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245 | (session.log or log)("debug", "BOSH client inactive too long, destroying session at %d", now); |
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246 | sessions[session.sid] = nil; |
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247 | inactive_sessions[session] = nil; |
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248 | sm_destroy_session(session, "BOSH client silent for over "..session.bosh_max_inactive.." seconds"); |
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249 | end |
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250 | else |
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251 | inactive_sessions[session] = nil; |
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252 | end |
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253 | end |
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254 | end |
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255 | |
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256 | local ports = config.get(module.host, "core", "bosh_ports") or { 5280 }; |
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257 | for _, options in ipairs(ports) do |
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258 | local port, base, ssl, interface = 5280, "http-bind", false, nil; |
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259 | if type(options) == "number" then |
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260 | port = options; |
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261 | elseif type(options) == "table" then |
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262 | port, base, ssl, interface = options.port or 5280, options.path or "http-bind", options.ssl or false, options.interface; |
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263 | elseif type(options) == "string" then |
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264 | base = options; |
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265 | end |
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266 | httpserver.new{ port = port, base = base, handler = handle_request, ssl = ssl } |
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267 | end |
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268 | |
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269 | server.addtimer(on_timer); |