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760c345dc7a1
net/http/server.lua

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net/http/server.lua @ 5333:760c345dc7a1

net.http.server: Ensure HTTP callbacks are never called recursively for pipelined requests.
author Waqas Hussain <waqas20@gmail.com>
date Tue, 26 Feb 2013 19:41:52 +0500
parent 5300:fcb1be0b4a5c
child 5404:ae9a47e579d7
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fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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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 events = require "util.events".new();
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5 local addserver = require "net.server".addserver;
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6 local log = require "util.logger".init("http.server");
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7 local os_date = os.date;
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8 local pairs = pairs;
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9 local s_upper = string.upper;
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10 local setmetatable = setmetatable;
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11 local xpcall = xpcall;
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12 local debug = debug;
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13 local tostring = tostring;
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14 local codes = require "net.http.codes";
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15
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16 local _M = {};
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17
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18 local sessions = {};
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19 local listener = {};
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20 local hosts = {};
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21 local default_host;
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22
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23 local function is_wildcard_event(event)
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24 return event:sub(-2, -1) == "/*";
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25 end
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26 local function is_wildcard_match(wildcard_event, event)
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27 return wildcard_event:sub(1, -2) == event:sub(1, #wildcard_event-1);
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28 end
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29
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30 local event_map = events._event_map;
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31 setmetatable(events._handlers, {
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32 __index = function (handlers, curr_event)
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33 if is_wildcard_event(curr_event) then return; end -- Wildcard events cannot be fired
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34 -- Find all handlers that could match this event, sort them
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35 -- and then put the array into handlers[curr_event] (and return it)
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36 local matching_handlers_set = {};
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37 local handlers_array = {};
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38 for event, handlers_set in pairs(event_map) do
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39 if event == curr_event or
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40 is_wildcard_event(event) and is_wildcard_match(event, curr_event) then
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41 for handler, priority in pairs(handlers_set) do
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42 matching_handlers_set[handler] = { (select(2, event:gsub("/", "%1"))), is_wildcard_event(event) and 0 or 1, priority };
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43 table.insert(handlers_array, handler);
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44 end
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45 end
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46 end
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47 if #handlers_array > 0 then
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48 table.sort(handlers_array, function(b, a)
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49 local a_score, b_score = matching_handlers_set[a], matching_handlers_set[b];
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50 for i = 1, #a_score do
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51 if a_score[i] ~= b_score[i] then -- If equal, compare next score value
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52 return a_score[i] < b_score[i];
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53 end
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54 end
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55 return false;
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56 end);
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57 else
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58 handlers_array = false;
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59 end
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60 rawset(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 the indexes of all matching events
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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 rawset(handlers, curr_event, handlers_array);
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74 end;
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75 });
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76
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77 local handle_request;
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78 local _1, _2, _3;
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79 local function _handle_request() return handle_request(_1, _2, _3); end
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80
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81 local last_err;
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82 local function _traceback_handler(err) last_err = err; log("error", "Traceback[http]: %s: %s", tostring(err), debug.traceback()); end
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83 events.add_handler("http-error", function (error)
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84 return "Error processing request: "..codes[error.code]..". Check your error log for more information.";
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85 end, -1);
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86
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87 function listener.onconnect(conn)
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88 local secure = conn:ssl() and true or nil;
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89 local pending = {};
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90 local waiting = false;
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91 local function process_next()
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92 if waiting then log("debug", "can't process_next, waiting"); return; end
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93 waiting = true;
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94 while sessions[conn] and #pending > 0 do
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95 local request = t_remove(pending);
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96 --log("debug", "process_next: %s", request.path);
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97 --handle_request(conn, request, process_next);
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98 _1, _2, _3 = conn, request, process_next;
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99 if not xpcall(_handle_request, _traceback_handler) then
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100 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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101 conn:close();
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102 end
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103 end
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104 --log("debug", "ready for more");
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105 waiting = false;
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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 if waiting then
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110 log("error", "http connection handler is not reentrant: %s", request.path);
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111 assert(false, "http connection handler is not reentrant");
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112 end
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113 request.secure = secure;
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114 t_insert(pending, request);
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115 process_next();
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116 end
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117 local function error_cb(err)
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118 log("debug", "error_cb: %s", err or "<nil>");
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119 -- FIXME don't close immediately, wait until we process current stuff
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120 -- FIXME if err, send off a bad-request response
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121 sessions[conn] = nil;
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122 conn:close();
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123 end
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124 sessions[conn] = parser_new(success_cb, error_cb);
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125 end
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126
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127 function listener.ondisconnect(conn)
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128 local open_response = conn._http_open_response;
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129 if open_response and open_response.on_destroy then
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130 open_response.finished = true;
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131 open_response:on_destroy();
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132 end
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133 sessions[conn] = nil;
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134 end
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135
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136 function listener.onincoming(conn, data)
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137 sessions[conn]:feed(data);
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138 end
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139
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140 local headerfix = setmetatable({}, {
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141 __index = function(t, k)
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142 local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": ";
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143 t[k] = v;
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144 return v;
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145 end
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146 });
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147
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148 function _M.hijack_response(response, listener)
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149 error("TODO");
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150 end
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151 function handle_request(conn, request, finish_cb)
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152 --log("debug", "handler: %s", request.path);
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153 local headers = {};
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154 for k,v in pairs(request.headers) do headers[k:gsub("-", "_")] = v; end
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155 request.headers = headers;
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156 request.conn = conn;
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157
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158 local date_header = os_date('!%a, %d %b %Y %H:%M:%S GMT'); -- FIXME use
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159 local conn_header = request.headers.connection;
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160 conn_header = conn_header and ","..conn_header:gsub("[ \t]", ""):lower().."," or ""
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161 local httpversion = request.httpversion
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162 local persistent = conn_header:find(",keep-alive,", 1, true)
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163 or (httpversion == "1.1" and not conn_header:find(",close,", 1, true));
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164
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165 local response_conn_header;
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166 if persistent then
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167 response_conn_header = "Keep-Alive";
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168 else
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169 response_conn_header = httpversion == "1.1" and "close" or nil
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170 end
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171
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172 local response = {
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173 request = request;
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174 status_code = 200;
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175 headers = { date = date_header, connection = response_conn_header };
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176 persistent = persistent;
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177 conn = conn;
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178 send = _M.send_response;
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179 finish_cb = finish_cb;
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180 };
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181 conn._http_open_response = response;
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182
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183 local host = (request.headers.host or ""):match("[^:]+");
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184
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185 -- Some sanity checking
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186 local err_code, err;
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187 if not request.path then
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188 err_code, err = 400, "Invalid path";
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189 elseif not hosts[host] then
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190 if hosts[default_host] then
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191 host = default_host;
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192 elseif host then
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193 err_code, err = 404, "Unknown host: "..host;
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194 else
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195 err_code, err = 400, "Missing or invalid 'Host' header";
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196 end
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197 end
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198
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199 if err then
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200 response.status_code = err_code;
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201 response:send(events.fire_event("http-error", { code = err_code, message = err }));
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202 return;
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203 end
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204
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205 local event = request.method.." "..host..request.path:match("[^?]*");
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206 local payload = { request = request, response = response };
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207 --log("debug", "Firing event: %s", event);
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208 local result = events.fire_event(event, payload);
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diff changeset
209 if result ~= nil then
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210 if result ~= true then
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parents: 4787
diff changeset
211 local body;
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212 local result_type = type(result);
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213 if result_type == "number" then
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214 response.status_code = result;
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parents: 4735
diff changeset
215 if result >= 400 then
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parents: 4735
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216 body = events.fire_event("http-error", { code = result });
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217 end
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218 elseif result_type == "string" then
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219 body = result;
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220 elseif result_type == "table" then
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diff changeset
221 for k, v in pairs(result) do
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222 response[k] = v;
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223 end
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parents: 4682
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224 end
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225 response:send(body);
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226 end
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diff changeset
227 return;
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228 end
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229
4736
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230 -- if handler not called, return 404
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diff changeset
231 response.status_code = 404;
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diff changeset
232 response:send(events.fire_event("http-error", { code = 404 }));
4631
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233 end
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234 function _M.send_response(response, body)
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diff changeset
235 if response.finished then return; end
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parents: 4689
diff changeset
236 response.finished = true;
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parents: 4689
diff changeset
237 response.conn._http_open_response = nil;
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238
4631
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diff changeset
239 local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]);
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diff changeset
240 local headers = response.headers;
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1d753fecf95b net.http.server: Use response.body if it exists and body is not specified to send_response
Matthew Wild <mwild1@gmail.com>
parents: 4771
diff changeset
241 body = body or response.body or "";
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242 headers.content_length = #body;
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243
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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244 local output = { status_line };
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245 for k,v in pairs(headers) do
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246 t_insert(output, headerfix[k]..v);
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247 end
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248 t_insert(output, "\r\n\r\n");
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249 t_insert(output, body);
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250
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251 response.conn:write(t_concat(output));
4691
a164fc7057ae net.http.server: Support for on_destroy callback on response objects, and a 'finished' flag to say when they are destroyed (responded to or connection closed)
Matthew Wild <mwild1@gmail.com>
parents: 4689
diff changeset
252 if response.on_destroy then
a164fc7057ae net.http.server: Support for on_destroy callback on response objects, and a 'finished' flag to say when they are destroyed (responded to or connection closed)
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parents: 4689
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253 response:on_destroy();
a164fc7057ae net.http.server: Support for on_destroy callback on response objects, and a 'finished' flag to say when they are destroyed (responded to or connection closed)
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parents: 4689
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254 response.on_destroy = nil;
a164fc7057ae net.http.server: Support for on_destroy callback on response objects, and a 'finished' flag to say when they are destroyed (responded to or connection closed)
Matthew Wild <mwild1@gmail.com>
parents: 4689
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255 end
5300
fcb1be0b4a5c net.http.server: Properly handle persistent connections
Florian Zeitz <florob@babelmonkeys.de>
parents: 4788
diff changeset
256 if response.persistent then
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257 response:finish_cb();
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258 else
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259 response.conn:close();
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260 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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261 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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parents:
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262 function _M.add_handler(event, handler, priority)
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263 events.add_handler(event, handler, priority);
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264 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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265 function _M.remove_handler(event, handler)
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266 events.remove_handler(event, handler);
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267 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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268
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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parents:
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269 function _M.listen_on(port, interface, ssl)
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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270 addserver(interface or "*", port, listener, "*a", ssl);
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271 end
4736
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
272 function _M.add_host(host)
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
273 hosts[host] = true;
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
274 end
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
275 function _M.remove_host(host)
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
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parents: 4735
diff changeset
276 hosts[host] = nil;
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
277 end
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
278 function _M.set_default_host(host)
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
279 default_host = host;
3514338c59c3 net.http.server, mod_http: Support http_default_host config option to specify where to direct requests for unknown HTTP vhosts
Matthew Wild <mwild1@gmail.com>
parents: 4735
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280 end
4631
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281
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282 _M.listener = listener;
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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283 _M.codes = codes;
4706
845393c76d17 net.http.server: Expose events object (for debug purposes)
Matthew Wild <mwild1@gmail.com>
parents: 4704
diff changeset
284 _M._events = events;
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285 return _M;