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net/http/server.lua

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net/http/server.lua @ 5504:b760b5f0c2b0

net.server.http: Add a comment
author Matthew Wild <mwild1@gmail.com>
date Mon, 22 Apr 2013 12:25:00 +0100
parent 5503:91052e59375c
child 5505:0b6a99e6c1b1
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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 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 -- Called when firing an event that doesn't exist (but may match a wildcard handler)
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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
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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 else
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61 handlers_array = false;
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62 end
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63 rawset(handlers, curr_event, handlers_array);
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64 if not event_map[curr_event] then -- Only wildcard handlers match, if any
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65 table.insert(recent_wildcard_events, curr_event);
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66 if #recent_wildcard_events > max_cached_wildcard_events then
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67 rawset(handlers, table.remove(recent_wildcard_events, 1), nil);
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68 end
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69 end
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70 return handlers_array;
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71 end;
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72 __newindex = function (handlers, curr_event, handlers_array)
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73 if handlers_array == nil
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74 and is_wildcard_event(curr_event) then
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75 -- Invalidate the indexes of all matching events
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76 for event in pairs(handlers) do
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77 if is_wildcard_match(curr_event, event) then
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78 handlers[event] = nil;
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79 end
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80 end
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81 end
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82 rawset(handlers, curr_event, handlers_array);
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83 end;
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84 });
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85
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86 local handle_request;
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87 local _1, _2, _3;
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88 local function _handle_request() return handle_request(_1, _2, _3); end
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89
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90 local last_err;
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91 local function _traceback_handler(err) last_err = err; log("error", "Traceback[http]: %s: %s", tostring(err), debug.traceback()); end
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92 events.add_handler("http-error", function (error)
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93 return "Error processing request: "..codes[error.code]..". Check your error log for more information.";
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94 end, -1);
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95
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96 function listener.onconnect(conn)
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97 local secure = conn:ssl() and true or nil;
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98 local pending = {};
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99 local waiting = false;
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100 local function process_next()
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101 if waiting then log("debug", "can't process_next, waiting"); return; end
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102 waiting = true;
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103 while sessions[conn] and #pending > 0 do
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104 local request = t_remove(pending);
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105 --log("debug", "process_next: %s", request.path);
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106 --handle_request(conn, request, process_next);
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107 _1, _2, _3 = conn, request, process_next;
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108 if not xpcall(_handle_request, _traceback_handler) then
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109 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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110 conn:close();
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111 end
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112 end
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113 --log("debug", "ready for more");
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114 waiting = false;
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115 end
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116 local function success_cb(request)
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117 --log("debug", "success_cb: %s", request.path);
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118 if waiting then
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119 log("error", "http connection handler is not reentrant: %s", request.path);
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120 assert(false, "http connection handler is not reentrant");
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parents: 5300
diff changeset
121 end
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122 request.secure = secure;
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diff changeset
123 t_insert(pending, request);
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760c345dc7a1 net.http.server: Ensure HTTP callbacks are never called recursively for pipelined requests.
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diff changeset
124 process_next();
4631
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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125 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
Waqas Hussain <waqas20@gmail.com>
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126 local function error_cb(err)
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127 log("debug", "error_cb: %s", err or "<nil>");
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128 -- FIXME don't close immediately, wait until we process current stuff
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129 -- FIXME if err, send off a bad-request response
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130 sessions[conn] = nil;
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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131 conn:close();
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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132 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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133 sessions[conn] = parser_new(success_cb, error_cb);
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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134 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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135
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136 function listener.ondisconnect(conn)
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137 local open_response = conn._http_open_response;
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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138 if open_response and open_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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139 open_response.finished = true;
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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140 open_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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141 end
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142 sessions[conn] = nil;
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143 end
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144
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145 function listener.onincoming(conn, data)
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146 sessions[conn]:feed(data);
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147 end
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148
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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149 local headerfix = setmetatable({}, {
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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150 __index = function(t, k)
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151 local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": ";
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152 t[k] = v;
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153 return v;
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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154 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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diff changeset
155 });
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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156
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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157 function _M.hijack_response(response, listener)
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158 error("TODO");
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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159 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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160 function handle_request(conn, request, finish_cb)
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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161 --log("debug", "handler: %s", request.path);
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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162 local headers = {};
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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163 for k,v in pairs(request.headers) do headers[k:gsub("-", "_")] = v; end
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164 request.headers = headers;
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165 request.conn = conn;
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166
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167 local date_header = os_date('!%a, %d %b %Y %H:%M:%S GMT'); -- FIXME use
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168 local conn_header = request.headers.connection;
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169 conn_header = conn_header and ","..conn_header:gsub("[ \t]", ""):lower().."," or ""
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170 local httpversion = request.httpversion
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parents: 5439
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171 local persistent = conn_header:find(",Keep-Alive,", 1, true)
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diff changeset
172 or (httpversion == "1.1" and not conn_header:find(",close,", 1, true));
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173
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parents: 4788
diff changeset
174 local response_conn_header;
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diff changeset
175 if persistent then
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diff changeset
176 response_conn_header = "Keep-Alive";
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parents: 4788
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177 else
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178 response_conn_header = httpversion == "1.1" and "close" or nil
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parents: 4788
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179 end
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180
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diff changeset
181 local response = {
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182 request = request;
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diff changeset
183 status_code = 200;
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parents: 4788
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184 headers = { date = date_header, connection = response_conn_header };
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185 persistent = persistent;
4631
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186 conn = conn;
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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187 send = _M.send_response;
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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188 finish_cb = finish_cb;
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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189 };
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parents: 4689
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190 conn._http_open_response = response;
4631
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diff changeset
191
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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
192 local host = (request.headers.host or ""):match("[^:]+");
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diff changeset
193
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parents: 4735
diff changeset
194 -- Some sanity checking
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diff changeset
195 local err_code, err;
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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
196 if not request.path then
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parents: 4735
diff changeset
197 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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parents: 4736
diff changeset
198 elseif not hosts[host] then
4736
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parents: 4735
diff changeset
199 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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parents: 4735
diff changeset
200 host = default_host;
4740
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 elseif host then
bd9c8bc8036f net.http.server: Try default_host if client sent no host anywhere, otherwise... fail. It's 2012.
Matthew Wild <mwild1@gmail.com>
parents: 4739
diff changeset
202 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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parents: 4735
diff changeset
203 else
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parents: 4739
diff changeset
204 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
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
205 end
4713
9c15fa5192d3 net.http.server: Fire http-error 400 if request fails sanity checks
Matthew Wild <mwild1@gmail.com>
parents: 4710
diff changeset
206 end
9c15fa5192d3 net.http.server: Fire http-error 400 if request fails sanity checks
Matthew Wild <mwild1@gmail.com>
parents: 4710
diff changeset
207
9c15fa5192d3 net.http.server: Fire http-error 400 if request fails sanity checks
Matthew Wild <mwild1@gmail.com>
parents: 4710
diff changeset
208 if err then
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
209 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
diff changeset
210 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
211 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
212 end
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Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
213
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Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
214 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
215 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
216 --log("debug", "Firing event: %s", event);
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
217 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
218 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
Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
219 if result ~= true then
4788
e14f5a156571 net.http.server: Code cleanup/adjustment now that send_response() accepts response.body
Matthew Wild <mwild1@gmail.com>
parents: 4787
diff changeset
220 local body;
4736
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parents: 4735
diff changeset
221 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
222 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
223 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
224 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
225 body = events.fire_event("http-error", { code = result });
4631
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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parents:
diff changeset
226 end
4736
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Matthew Wild <mwild1@gmail.com>
parents: 4735
diff changeset
227 elseif result_type == "string" then
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parents: 4735
diff changeset
228 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
229 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
230 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
231 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
232 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
233 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
234 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
235 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
236 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
237 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
238 end
4683
c1374e083c97 net.http.server: Handle results returned by handlers, and send as a response. Also removes explicit firing of '*', which can now be done via wildcard events.
Matthew Wild <mwild1@gmail.com>
parents: 4682
diff changeset
239 end
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240 response:send(body);
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241 end
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242 return;
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243 end
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244
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245 -- if handler not called, return 404
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246 response.status_code = 404;
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247 response:send(events.fire_event("http-error", { code = 404 }));
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248 end
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249 function _M.send_response(response, body)
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250 if response.finished then return; end
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251 response.finished = true;
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252 response.conn._http_open_response = nil;
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253
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254 local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]);
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255 local headers = response.headers;
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256 body = body or response.body or "";
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257 headers.content_length = #body;
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258
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259 local output = { status_line };
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260 for k,v in pairs(headers) do
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261 t_insert(output, headerfix[k]..v);
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262 end
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263 t_insert(output, "\r\n\r\n");
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264 t_insert(output, body);
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265
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266 response.conn:write(t_concat(output));
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267 if response.on_destroy then
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268 response:on_destroy();
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269 response.on_destroy = nil;
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270 end
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271 if response.persistent then
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272 response:finish_cb();
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273 else
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274 response.conn:close();
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275 end
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276 end
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277 function _M.add_handler(event, handler, priority)
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278 events.add_handler(event, handler, priority);
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279 end
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280 function _M.remove_handler(event, handler)
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281 events.remove_handler(event, handler);
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282 end
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283
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284 function _M.listen_on(port, interface, ssl)
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285 addserver(interface or "*", port, listener, "*a", ssl);
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286 end
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287 function _M.add_host(host)
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288 hosts[host] = true;
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289 end
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290 function _M.remove_host(host)
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291 hosts[host] = nil;
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292 end
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293 function _M.set_default_host(host)
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294 default_host = host;
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295 end
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296 function _M.fire_event(event, ...)
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297 return events.fire_event(event, ...);
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298 end
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299
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300 _M.listener = listener;
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301 _M.codes = codes;
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302 _M._events = events;
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303 return _M;