Wed, 21 Jun 2023 12:21:09 +0200
server: Import one of Prosodys net.server implementations
Wraps up this behavior in a new module.
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1 | |
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2 | local new_xmpp_stream = require "prosody.util.xmppstream".new; |
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3 | local st = require "prosody.util.stanza"; |
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4 | local http = require "prosody.net.http"; |
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5 | |
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6 | local stream_mt = setmetatable({}, { __index = verse.stream_mt }); |
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7 | stream_mt.__index = stream_mt; |
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8 | |
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9 | local xmlns_stream = "http://etherx.jabber.org/streams"; |
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10 | local xmlns_bosh = "http://jabber.org/protocol/httpbind"; |
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11 | |
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12 | local reconnect_timeout = 5; |
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13 | |
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14 | function verse.new_bosh(logger, url) |
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15 | local stream = { |
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16 | bosh_conn_pool = {}; |
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17 | bosh_waiting_requests = {}; |
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18 | bosh_rid = math.random(1,999999); |
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19 | bosh_outgoing_buffer = {}; |
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20 | bosh_url = url; |
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21 | conn = {}; |
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22 | }; |
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23 | function stream:reopen() |
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24 | self.bosh_need_restart = true; |
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25 | self:flush(); |
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26 | end |
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27 | local conn = verse.new(logger, stream); |
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28 | return setmetatable(conn, stream_mt); |
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29 | end |
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30 | |
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31 | function stream_mt:connect() |
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32 | self:_send_session_request(); |
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33 | end |
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34 | |
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35 | function stream_mt:send(data) |
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36 | self:debug("Putting into BOSH send buffer: %s", tostring(data)); |
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37 | self.bosh_outgoing_buffer[#self.bosh_outgoing_buffer+1] = st.clone(data); |
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38 | self:flush(); --TODO: Optimize by doing this on next tick (give a chance for data to buffer) |
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39 | end |
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40 | |
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41 | function stream_mt:flush() |
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42 | if self.connected |
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43 | and #self.bosh_waiting_requests < self.bosh_max_requests |
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44 | and (#self.bosh_waiting_requests == 0 |
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45 | or #self.bosh_outgoing_buffer > 0 |
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46 | or self.bosh_need_restart) then |
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47 | self:debug("Flushing..."); |
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48 | local payload = self:_make_body(); |
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49 | local buffer = self.bosh_outgoing_buffer; |
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50 | for i, stanza in ipairs(buffer) do |
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51 | payload:add_child(stanza); |
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52 | buffer[i] = nil; |
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53 | end |
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54 | self:_make_request(payload); |
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55 | else |
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56 | self:debug("Decided not to flush."); |
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57 | end |
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58 | end |
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59 | |
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60 | function stream_mt:_make_request(payload) |
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61 | local request, err = http.request(self.bosh_url, { body = tostring(payload) }, function (response, code, request) |
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62 | if code ~= 0 then |
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63 | self.inactive_since = nil; |
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64 | return self:_handle_response(response, code, request); |
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65 | end |
411 | 66 | |
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67 | -- Connection issues, we need to retry this request |
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68 | local time = os.time(); |
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69 | if not self.inactive_since then |
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70 | self.inactive_since = time; -- So we know when it is time to give up |
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71 | elseif time - self.inactive_since > self.bosh_max_inactivity then |
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72 | return self:_disconnected(); |
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73 | else |
411 | 74 | self:debug("%d seconds left to reconnect, retrying in %d seconds...", |
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75 | self.bosh_max_inactivity - (time - self.inactive_since), reconnect_timeout); |
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76 | end |
411 | 77 | |
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78 | -- Set up reconnect timer |
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79 | timer.add_task(reconnect_timeout, function () |
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80 | self:debug("Retrying request..."); |
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81 | -- Remove old request |
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82 | for i, waiting_request in ipairs(self.bosh_waiting_requests) do |
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83 | if waiting_request == request then |
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84 | table.remove(self.bosh_waiting_requests, i); |
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85 | break; |
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86 | end |
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87 | end |
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88 | self:_make_request(payload); |
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89 | end); |
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90 | end); |
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91 | if request then |
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92 | table.insert(self.bosh_waiting_requests, request); |
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93 | else |
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94 | self:warn("Request failed instantly: %s", err); |
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95 | end |
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96 | end |
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97 | |
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98 | function stream_mt:_disconnected() |
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99 | self.connected = nil; |
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100 | self:event("disconnected"); |
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101 | end |
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102 | |
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103 | function stream_mt:_send_session_request() |
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104 | local body = self:_make_body(); |
411 | 105 | |
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106 | -- XEP-0124 |
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107 | body.attr.hold = "1"; |
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108 | body.attr.wait = "60"; |
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109 | body.attr["xml:lang"] = "en"; |
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110 | body.attr.ver = "1.6"; |
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111 | |
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112 | -- XEP-0206 |
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113 | body.attr.from = self.jid; |
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114 | body.attr.to = self.host; |
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115 | body.attr.secure = 'true'; |
411 | 116 | |
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117 | http.request(self.bosh_url, { body = tostring(body) }, function (response, code) |
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118 | if code == 0 then |
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119 | -- Failed to connect |
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120 | return self:_disconnected(); |
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121 | end |
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122 | -- Handle session creation response |
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123 | local payload = self:_parse_response(response) |
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124 | if not payload then |
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125 | self:warn("Invalid session creation response"); |
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126 | self:_disconnected(); |
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127 | return; |
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128 | end |
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129 | self.bosh_sid = payload.attr.sid; -- Session id |
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130 | self.bosh_wait = tonumber(payload.attr.wait); -- How long the server may hold connections for |
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131 | self.bosh_hold = tonumber(payload.attr.hold); -- How many connections the server may hold |
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132 | self.bosh_max_inactivity = tonumber(payload.attr.inactivity); -- Max amount of time with no connections |
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133 | self.bosh_max_requests = tonumber(payload.attr.requests) or self.bosh_hold; -- Max simultaneous requests we can make |
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134 | self.connected = true; |
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135 | self:event("connected"); |
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136 | self:_handle_response_payload(payload); |
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137 | end); |
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138 | end |
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139 | |
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140 | function stream_mt:_handle_response(response, code, request) |
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141 | if self.bosh_waiting_requests[1] ~= request then |
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142 | self:warn("Server replied to request that wasn't the oldest"); |
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143 | for i, waiting_request in ipairs(self.bosh_waiting_requests) do |
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144 | if waiting_request == request then |
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145 | self.bosh_waiting_requests[i] = nil; |
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146 | break; |
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147 | end |
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148 | end |
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149 | else |
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150 | table.remove(self.bosh_waiting_requests, 1); |
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151 | end |
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152 | local payload = self:_parse_response(response); |
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153 | if payload then |
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154 | self:_handle_response_payload(payload); |
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155 | end |
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156 | self:flush(); |
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157 | end |
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158 | |
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159 | function stream_mt:_handle_response_payload(payload) |
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160 | local stanzas = payload.tags; |
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161 | for i = 1, #stanzas do |
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162 | local stanza = stanzas[i]; |
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163 | if stanza.attr.xmlns == xmlns_stream then |
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164 | self:event("stream-"..stanza.name, stanza); |
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165 | elseif stanza.attr.xmlns then |
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166 | self:event("stream/"..stanza.attr.xmlns, stanza); |
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167 | else |
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168 | self:event("stanza", stanza); |
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169 | end |
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170 | end |
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171 | if payload.attr.type == "terminate" then |
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172 | self:_disconnected({reason = payload.attr.condition}); |
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173 | end |
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174 | end |
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175 | |
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176 | local stream_callbacks = { |
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177 | stream_ns = "http://jabber.org/protocol/httpbind", stream_tag = "body", |
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178 | default_ns = "jabber:client", |
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179 | streamopened = function (session, attr) session.notopen = nil; session.payload = verse.stanza("body", attr); return true; end; |
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180 | handlestanza = function (session, stanza) session.payload:add_child(stanza); end; |
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181 | }; |
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182 | function stream_mt:_parse_response(response) |
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183 | self:debug("Parsing response: %s", response); |
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184 | if response == nil then |
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185 | self:debug("%s", debug.traceback()); |
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186 | self:_disconnected(); |
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187 | return; |
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188 | end |
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189 | local session = { notopen = true, stream = self }; |
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190 | local stream = new_xmpp_stream(session, stream_callbacks); |
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191 | stream:feed(response); |
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192 | return session.payload; |
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193 | end |
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194 | |
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195 | function stream_mt:_make_body() |
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196 | self.bosh_rid = self.bosh_rid + 1; |
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197 | local body = verse.stanza("body", { |
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198 | xmlns = xmlns_bosh; |
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199 | content = "text/xml; charset=utf-8"; |
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200 | sid = self.bosh_sid; |
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201 | rid = self.bosh_rid; |
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202 | }); |
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203 | if self.bosh_need_restart then |
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204 | self.bosh_need_restart = nil; |
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205 | body.attr.restart = 'true'; |
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206 | end |
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207 | return body; |
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208 | end |