prosody
54ca6511e699
net/http/server.lua

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net/http/server.lua @ 4710:54ca6511e699

net.http.server: Make error handling overrideable via 'http-error' event
author Matthew Wild <mwild1@gmail.com>
date Thu, 26 Apr 2012 15:14:19 +0100
parent 4709:98bfebb38705
child 4713:9c15fa5192d3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1
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2 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
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3 local parser_new = require "net.http.parser".new;
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4 local url_parse = require "socket.url".parse;
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5 local events = require "util.events".new();
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6 local addserver = require "net.server".addserver;
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7 local log = require "util.logger".init("http.server");
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8 local os_date = os.date;
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9 local pairs = pairs;
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10 local s_upper = string.upper;
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11 local setmetatable = setmetatable;
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12 local xpcall = xpcall;
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13 local debug = debug;
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14 local tostring = tostring;
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15 local codes = require "net.http.codes";
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16 local _G = _G;
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17 local legacy_httpserver = require "net.httpserver";
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18
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19 local _M = {};
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20
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21 local sessions = {};
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22 local handlers = {};
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23
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24 local listener = {};
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25
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26 local function is_wildcard_event(event)
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27 return event:sub(-2, -1) == "/*";
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28 end
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29 local function is_wildcard_match(wildcard_event, event)
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30 return wildcard_event:sub(1, -2) == event:sub(1, #wildcard_event-1);
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31 end
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32
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33 local event_map = events._event_map;
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34 setmetatable(events._handlers, {
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35 __index = function (handlers, curr_event)
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36 if is_wildcard_event(curr_event) then return; end -- Wildcard events cannot be fired
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37 -- Find all handlers that could match this event, sort them
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38 -- and then put the array into handlers[curr_event] (and return it)
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39 local matching_handlers_set = {};
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40 local handlers_array = {};
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41 for event, handlers_set in pairs(event_map) do
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42 if event == curr_event or
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43 is_wildcard_event(event) and is_wildcard_match(event, curr_event) then
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44 for handler, priority in pairs(handlers_set) do
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45 matching_handlers_set[handler] = { (select(2, event:gsub("/", "%1"))), is_wildcard_event(event) and 0 or 1, priority };
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46 table.insert(handlers_array, handler);
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47 end
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48 end
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49 end
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50 if #handlers_array == 0 then return; end
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51 table.sort(handlers_array, function(b, a)
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52 local a_score, b_score = matching_handlers_set[a], matching_handlers_set[b];
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53 for i = 1, #a_score do
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54 if a_score[i] ~= b_score[i] then -- If equal, compare next score value
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55 return a_score[i] < b_score[i];
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56 end
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57 end
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58 return false;
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59 end);
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60 handlers[curr_event] = handlers_array;
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61 return handlers_array;
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62 end;
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63 __newindex = function (handlers, curr_event, handlers_array)
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64 if handlers_array == nil
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65 and is_wildcard_event(curr_event) then
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66 -- Invalidate all matching
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67 for event in pairs(handlers) do
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68 if is_wildcard_match(curr_event, event) then
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69 handlers[event] = nil;
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70 end
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71 end
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72 end
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73 end;
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74 });
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75
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76 local handle_request;
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77 local _1, _2, _3;
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78 local function _handle_request() return handle_request(_1, _2, _3); end
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79
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80 local last_err;
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81 local function _traceback_handler(err) last_err = err; log("error", "Traceback[http]: %s: %s", tostring(err), debug.traceback()); end
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82 events.add_handler("http-error", function (error)
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83 return "Error processing request: "..codes[error.code]..". Check your error log for more information.";
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84 end, -1);
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85
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86 function listener.onconnect(conn)
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87 local secure = conn:ssl() and true or nil;
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88 local pending = {};
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89 local waiting = false;
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90 local function process_next(last_response)
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91 --if waiting then log("debug", "can't process_next, waiting"); return; end
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92 if sessions[conn] and #pending > 0 then
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93 local request = t_remove(pending);
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94 --log("debug", "process_next: %s", request.path);
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95 waiting = true;
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96 --handle_request(conn, request, process_next);
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97 _1, _2, _3 = conn, request, process_next;
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98 if not xpcall(_handle_request, _traceback_handler) then
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99 conn:write("HTTP/1.0 500 Internal Server Error\r\n\r\n"..events.fire_event("http-error", { code = 500, private_message = last_err }));
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100 conn:close();
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101 end
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102 else
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103 --log("debug", "ready for more");
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104 waiting = false;
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105 end
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106 end
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107 local function success_cb(request)
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108 --log("debug", "success_cb: %s", request.path);
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109 request.secure = secure;
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110 local parsed_dest = url_parse(request.path);
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111 request.url = parsed_dest;
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112 request.path = parsed_dest.path;
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113 t_insert(pending, request);
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114 if not waiting then
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115 process_next();
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116 end
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117 end
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118 local function error_cb(err)
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119 log("debug", "error_cb: %s", err or "<nil>");
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120 -- FIXME don't close immediately, wait until we process current stuff
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121 -- FIXME if err, send off a bad-request response
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122 sessions[conn] = nil;
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123 conn:close();
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124 end
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125 sessions[conn] = parser_new(success_cb, error_cb);
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126 end
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127
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128 function listener.ondisconnect(conn)
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129 local open_response = conn._http_open_response;
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130 if open_response and open_response.on_destroy then
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131 open_response.finished = true;
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132 open_response:on_destroy();
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133 end
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134 sessions[conn] = nil;
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135 end
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136
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137 function listener.onincoming(conn, data)
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138 sessions[conn]:feed(data);
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139 end
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140
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141 local headerfix = setmetatable({}, {
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142 __index = function(t, k)
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143 local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": ";
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144 t[k] = v;
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145 return v;
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146 end
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147 });
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148
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149 function _M.hijack_response(response, listener)
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150 error("TODO");
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151 end
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152 function handle_request(conn, request, finish_cb)
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153 --log("debug", "handler: %s", request.path);
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154 local headers = {};
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155 for k,v in pairs(request.headers) do headers[k:gsub("-", "_")] = v; end
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156 request.headers = headers;
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157 request.conn = conn;
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158
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159 local date_header = os_date('!%a, %d %b %Y %H:%M:%S GMT'); -- FIXME use
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160 local conn_header = request.headers.connection;
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161 local keep_alive = conn_header == "Keep-Alive" or (request.httpversion == "1.1" and conn_header ~= "close");
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162
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163 local response = {
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164 request = request;
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165 status_code = 200;
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166 headers = { date = date_header, connection = (keep_alive and "Keep-Alive" or "close") };
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167 conn = conn;
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168 send = _M.send_response;
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169 finish_cb = finish_cb;
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170 };
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171 conn._http_open_response = response;
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172
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173 if not request.headers.host then
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174 response.status_code = 400;
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175 response.headers.content_type = "text/html";
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176 response:send(events.fire_event("http-error", { code = 400, message = "No 'Host' header" }));
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177 else
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178 local host = request.headers.host;
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179 if host then
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180 host = host:match("[^:]*"):lower();
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181 local event = request.method.." "..host..request.path:match("[^?]*");
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182 local payload = { request = request, response = response };
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183 --log("debug", "Firing event: %s", event);
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184 local result = events.fire_event(event, payload);
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185 if result ~= nil then
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186 if result ~= true then
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187 local code, body = 200, "";
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188 local result_type = type(result);
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189 if result_type == "number" then
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190 response.status_code = result;
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191 if result >= 400 then
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192 body = events.fire_event("http-error", { code = result });
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193 end
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194 elseif result_type == "string" then
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195 body = result;
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196 elseif result_type == "table" then
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197 body = result.body;
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198 result.body = nil;
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199 for k, v in pairs(result) do
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200 response[k] = v;
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201 end
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202 end
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203 response:send(body);
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204 end
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205 return;
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206 end
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207 end
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208
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209 -- if handler not called, return 404
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210 response.status_code = 404;
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211 response.headers.content_type = "text/html";
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212 response:send(events.fire_event("http-error", { code = 404 }));
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213 end
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214 end
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215 function _M.send_response(response, body)
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216 if response.finished then return; end
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217 response.finished = true;
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218 response.conn._http_open_response = nil;
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219
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220 local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]);
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221 local headers = response.headers;
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222 body = body or "";
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223 headers.content_length = #body;
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224
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225 local output = { status_line };
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226 for k,v in pairs(headers) do
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227 t_insert(output, headerfix[k]..v);
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228 end
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229 t_insert(output, "\r\n\r\n");
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230 t_insert(output, body);
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231
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232 response.conn:write(t_concat(output));
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233 if response.on_destroy then
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234 response:on_destroy();
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235 response.on_destroy = nil;
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236 end
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237 if headers.connection == "Keep-Alive" then
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238 response:finish_cb();
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239 else
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240 response.conn:close();
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241 end
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242 end
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243 function _M.add_handler(event, handler, priority)
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244 events.add_handler(event, handler, priority);
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245 end
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246 function _M.remove_handler(event, handler)
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247 events.remove_handler(event, handler);
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248 end
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249
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250 function _M.listen_on(port, interface, ssl)
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251 addserver(interface or "*", port, listener, "*a", ssl);
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252 end
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253
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254 _M.listener = listener;
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255 _M.codes = codes;
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256 _M._events = events;
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257 return _M;