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91052e59375c
net/http/server.lua

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net/http/server.lua @ 5503:91052e59375c

net.server.http: Ensure that event map cannot grow forever (limit to 10K wildcard-only entries)
author Matthew Wild <mwild1@gmail.com>
date Mon, 22 Apr 2013 12:24:42 +0100
parent 5487:03ddf2375d48
child 5504:b760b5f0c2b0
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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 recent_wildcard_events, max_cached_wildcard_events = {}, 10000;
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31
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32 local event_map = events._event_map;
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33 setmetatable(events._handlers, {
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34 __index = function (handlers, curr_event)
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35 if is_wildcard_event(curr_event) then return; end -- Wildcard events cannot be fired
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36 -- Find all handlers that could match this event, sort them
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37 -- and then put the array into handlers[curr_event] (and return it)
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38 local matching_handlers_set = {};
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39 local handlers_array = {};
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40 for event, handlers_set in pairs(event_map) do
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41 if event == curr_event or
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42 is_wildcard_event(event) and is_wildcard_match(event, curr_event) then
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43 for handler, priority in pairs(handlers_set) do
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44 matching_handlers_set[handler] = { (select(2, event:gsub("/", "%1"))), is_wildcard_event(event) and 0 or 1, priority };
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45 table.insert(handlers_array, handler);
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46 end
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47 end
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48 end
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49 if #handlers_array > 0 then
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50 table.sort(handlers_array, function(b, a)
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51 local a_score, b_score = matching_handlers_set[a], matching_handlers_set[b];
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52 for i = 1, #a_score do
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53 if a_score[i] ~= b_score[i] then -- If equal, compare next score value
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54 return a_score[i] < b_score[i];
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55 end
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56 end
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57 return false;
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58 end);
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59 else
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60 handlers_array = false;
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61 end
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62 rawset(handlers, curr_event, handlers_array);
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63 if not event_map[curr_event] then -- Only wildcard handlers match, if any
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64 table.insert(recent_wildcard_events, curr_event);
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65 if #recent_wildcard_events > max_cached_wildcard_events then
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66 rawset(handlers, table.remove(recent_wildcard_events, 1), nil);
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67 end
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68 end
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69 return handlers_array;
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70 end;
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71 __newindex = function (handlers, curr_event, handlers_array)
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72 if handlers_array == nil
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73 and is_wildcard_event(curr_event) then
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74 -- Invalidate the indexes of all matching events
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75 for event in pairs(handlers) do
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76 if is_wildcard_match(curr_event, event) then
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77 handlers[event] = nil;
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78 end
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79 end
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80 end
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81 rawset(handlers, curr_event, handlers_array);
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82 end;
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83 });
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84
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85 local handle_request;
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86 local _1, _2, _3;
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87 local function _handle_request() return handle_request(_1, _2, _3); end
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88
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89 local last_err;
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90 local function _traceback_handler(err) last_err = err; log("error", "Traceback[http]: %s: %s", tostring(err), debug.traceback()); end
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91 events.add_handler("http-error", function (error)
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92 return "Error processing request: "..codes[error.code]..". Check your error log for more information.";
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93 end, -1);
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94
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95 function listener.onconnect(conn)
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96 local secure = conn:ssl() and true or nil;
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97 local pending = {};
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98 local waiting = false;
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99 local function process_next()
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100 if waiting then log("debug", "can't process_next, waiting"); return; end
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101 waiting = true;
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102 while sessions[conn] and #pending > 0 do
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103 local request = t_remove(pending);
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104 --log("debug", "process_next: %s", request.path);
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105 --handle_request(conn, request, process_next);
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106 _1, _2, _3 = conn, request, process_next;
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107 if not xpcall(_handle_request, _traceback_handler) then
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108 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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109 conn:close();
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110 end
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111 end
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112 --log("debug", "ready for more");
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113 waiting = false;
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114 end
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115 local function success_cb(request)
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116 --log("debug", "success_cb: %s", request.path);
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117 if waiting then
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118 log("error", "http connection handler is not reentrant: %s", request.path);
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119 assert(false, "http connection handler is not reentrant");
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120 end
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121 request.secure = secure;
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122 t_insert(pending, request);
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123 process_next();
4631
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124 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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125 local function error_cb(err)
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126 log("debug", "error_cb: %s", err or "<nil>");
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127 -- FIXME don't close immediately, wait until we process current stuff
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128 -- FIXME if err, send off a bad-request response
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129 sessions[conn] = nil;
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130 conn:close();
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131 end
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132 sessions[conn] = parser_new(success_cb, error_cb);
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133 end
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134
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135 function listener.ondisconnect(conn)
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136 local open_response = conn._http_open_response;
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137 if open_response and open_response.on_destroy then
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138 open_response.finished = true;
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139 open_response:on_destroy();
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140 end
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141 sessions[conn] = nil;
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142 end
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143
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144 function listener.onincoming(conn, data)
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145 sessions[conn]:feed(data);
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146 end
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147
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148 local headerfix = setmetatable({}, {
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149 __index = function(t, k)
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150 local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": ";
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151 t[k] = v;
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152 return v;
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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153 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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154 });
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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155
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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156 function _M.hijack_response(response, listener)
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157 error("TODO");
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158 end
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159 function handle_request(conn, request, finish_cb)
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160 --log("debug", "handler: %s", request.path);
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161 local headers = {};
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162 for k,v in pairs(request.headers) do headers[k:gsub("-", "_")] = v; end
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163 request.headers = headers;
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164 request.conn = conn;
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165
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166 local date_header = os_date('!%a, %d %b %Y %H:%M:%S GMT'); -- FIXME use
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167 local conn_header = request.headers.connection;
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168 conn_header = conn_header and ","..conn_header:gsub("[ \t]", ""):lower().."," or ""
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169 local httpversion = request.httpversion
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170 local persistent = conn_header:find(",Keep-Alive,", 1, true)
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171 or (httpversion == "1.1" and not conn_header:find(",close,", 1, true));
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172
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173 local response_conn_header;
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174 if persistent then
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175 response_conn_header = "Keep-Alive";
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176 else
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177 response_conn_header = httpversion == "1.1" and "close" or nil
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178 end
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179
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180 local response = {
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181 request = request;
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182 status_code = 200;
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183 headers = { date = date_header, connection = response_conn_header };
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184 persistent = persistent;
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185 conn = conn;
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186 send = _M.send_response;
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187 finish_cb = finish_cb;
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188 };
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189 conn._http_open_response = response;
4631
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190
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parents: 4735
diff changeset
191 local host = (request.headers.host or ""):match("[^:]+");
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192
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193 -- Some sanity checking
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diff changeset
194 local err_code, err;
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parents: 4739
diff changeset
195 if not request.path then
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parents: 4735
diff changeset
196 err_code, err = 400, "Invalid path";
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f1d32a0dc057 net.http.server: Fix traceback on missing host header (thanks darkrain)
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diff changeset
197 elseif not hosts[host] then
4736
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diff changeset
198 if hosts[default_host] then
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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199 host = default_host;
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parents: 4739
diff changeset
200 elseif host then
bd9c8bc8036f net.http.server: Try default_host if client sent no host anywhere, otherwise... fail. It's 2012.
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parents: 4739
diff changeset
201 err_code, err = 404, "Unknown host: "..host;
4736
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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diff changeset
202 else
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parents: 4739
diff changeset
203 err_code, err = 400, "Missing or invalid 'Host' header";
4736
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
204 end
4713
9c15fa5192d3 net.http.server: Fire http-error 400 if request fails sanity checks
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parents: 4710
diff changeset
205 end
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parents: 4710
diff changeset
206
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parents: 4710
diff changeset
207 if err then
4736
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parents: 4735
diff changeset
208 response.status_code = err_code;
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
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209 response:send(events.fire_event("http-error", { code = err_code, message = err }));
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
210 return;
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
211 end
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Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
212
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parents: 4735
diff changeset
213 local event = request.method.." "..host..request.path:match("[^?]*");
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
214 local payload = { request = request, response = response };
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
215 --log("debug", "Firing event: %s", event);
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parents: 4735
diff changeset
216 local result = events.fire_event(event, payload);
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
217 if result ~= nil then
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
218 if result ~= true then
4788
e14f5a156571 net.http.server: Code cleanup/adjustment now that send_response() accepts response.body
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parents: 4787
diff changeset
219 local body;
4736
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parents: 4735
diff changeset
220 local result_type = type(result);
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
221 if result_type == "number" then
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
222 response.status_code = result;
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
223 if result >= 400 then
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
224 body = events.fire_event("http-error", { code = result });
4631
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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parents:
diff changeset
225 end
4736
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parents: 4735
diff changeset
226 elseif result_type == "string" then
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
227 body = result;
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
228 elseif result_type == "table" then
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
229 for k, v in pairs(result) do
5404
ae9a47e579d7 net.http.server: Don't overwrite existing response.headers when returning a response object from a HTTP handler (waqas says it's wrong)
Matthew Wild <mwild1@gmail.com>
parents: 5333
diff changeset
230 if k ~= "headers" then
ae9a47e579d7 net.http.server: Don't overwrite existing response.headers when returning a response object from a HTTP handler (waqas says it's wrong)
Matthew Wild <mwild1@gmail.com>
parents: 5333
diff changeset
231 response[k] = v;
ae9a47e579d7 net.http.server: Don't overwrite existing response.headers when returning a response object from a HTTP handler (waqas says it's wrong)
Matthew Wild <mwild1@gmail.com>
parents: 5333
diff changeset
232 else
ae9a47e579d7 net.http.server: Don't overwrite existing response.headers when returning a response object from a HTTP handler (waqas says it's wrong)
Matthew Wild <mwild1@gmail.com>
parents: 5333
diff changeset
233 for header_name, header_value in pairs(v) do
ae9a47e579d7 net.http.server: Don't overwrite existing response.headers when returning a response object from a HTTP handler (waqas says it's wrong)
Matthew Wild <mwild1@gmail.com>
parents: 5333
diff changeset
234 response.headers[header_name] = header_value;
ae9a47e579d7 net.http.server: Don't overwrite existing response.headers when returning a response object from a HTTP handler (waqas says it's wrong)
Matthew Wild <mwild1@gmail.com>
parents: 5333
diff changeset
235 end
ae9a47e579d7 net.http.server: Don't overwrite existing response.headers when returning a response object from a HTTP handler (waqas says it's wrong)
Matthew Wild <mwild1@gmail.com>
parents: 5333
diff changeset
236 end
4736
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Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
237 end
4683
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Matthew Wild <mwild1@gmail.com>
parents: 4682
diff changeset
238 end
4736
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
239 response:send(body);
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240 end
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241 return;
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242 end
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243
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244 -- if handler not called, return 404
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245 response.status_code = 404;
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246 response:send(events.fire_event("http-error", { code = 404 }));
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247 end
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248 function _M.send_response(response, body)
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249 if response.finished then return; end
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250 response.finished = true;
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251 response.conn._http_open_response = nil;
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252
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253 local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]);
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254 local headers = response.headers;
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255 body = body or response.body or "";
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256 headers.content_length = #body;
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257
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258 local output = { status_line };
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259 for k,v in pairs(headers) do
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260 t_insert(output, headerfix[k]..v);
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261 end
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262 t_insert(output, "\r\n\r\n");
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263 t_insert(output, body);
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264
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265 response.conn:write(t_concat(output));
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266 if response.on_destroy then
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267 response:on_destroy();
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268 response.on_destroy = nil;
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269 end
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270 if response.persistent then
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271 response:finish_cb();
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272 else
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273 response.conn:close();
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274 end
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275 end
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276 function _M.add_handler(event, handler, priority)
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277 events.add_handler(event, handler, priority);
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278 end
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279 function _M.remove_handler(event, handler)
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280 events.remove_handler(event, handler);
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281 end
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282
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283 function _M.listen_on(port, interface, ssl)
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284 addserver(interface or "*", port, listener, "*a", ssl);
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285 end
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286 function _M.add_host(host)
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287 hosts[host] = true;
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288 end
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289 function _M.remove_host(host)
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290 hosts[host] = nil;
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291 end
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292 function _M.set_default_host(host)
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293 default_host = host;
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294 end
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295 function _M.fire_event(event, ...)
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296 return events.fire_event(event, ...);
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297 end
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298
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299 _M.listener = listener;
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300 _M.codes = codes;
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301 _M._events = events;
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302 return _M;