libs/httpd/luasrc/httpd.lua

   1 --[[
   2
   3 HTTP server implementation for LuCI - core
   4 (c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
   5 (c) 2008 Steven Barth <steven@midlink.org>
   6
   7 Licensed under the Apache License, Version 2.0 (the "License");
   8 you may not use this file except in compliance with the License.
   9 You may obtain a copy of the License at
  10
  11         http://www.apache.org/licenses/LICENSE-2.0
  12
  13 $Id$
  14
  15 ]]--
  16
  17 module("luci.httpd", package.seeall)
  18 require("socket")
  19
  20 THREAD_IDLEWAIT = 0.01
  21 THREAD_TIMEOUT  = 90
  22 THREAD_LIMIT    = nil
  23
  24 local reading   = {}
  25 local clhandler = {}
  26 local erhandler = {}
  27
  28 local threadc = 0
  29 local threads = {}
  30 local threadm = {}
  31 local threadi = {}
  32
  33 local _meta = {__mode = "k"}
  34 setmetatable(threadm, _meta)
  35 setmetatable(threadi, _meta)
  36
  37
  38 function Socket(ip, port)
  39         local sock, err = socket.bind( ip, port )
  40
  41         if sock then
  42                 sock:settimeout( 0, "t" )
  43         end
  44
  45         return sock, err
  46 end
  47
  48 function corecv(socket, ...)
  49         threadi[socket] = true
  50
  51         while true do
  52                 local chunk, err, part = socket:receive(...)
  53
  54                 if err ~= "timeout" then
  55                         threadi[socket] = false
  56                         return chunk, err, part
  57                 end
  58
  59                 coroutine.yield()
  60         end
  61 end
  62
  63 function cosend(socket, chunk, i, ...)
  64         threadi[socket] = true
  65         i = i or 1
  66
  67         while true do
  68                 local stat, err, sent = socket:send(chunk, i, ...)
  69
  70                 if err ~= "timeout" then
  71                         threadi[socket] = false
  72                         return stat, err, sent
  73                 else
  74                         i = sent and (sent + 1) or i
  75                 end
  76
  77                 coroutine.yield()
  78         end
  79 end
  80
  81 function register(socket, s_clhandler, s_errhandler)
  82         table.insert(reading, socket)
  83         clhandler[socket] = s_clhandler
  84         erhandler[socket] = s_errhandler
  85 end
  86
  87 function run()
  88         while true do
  89                 step()
  90         end
  91 end
  92
  93 function step()
  94         local idle = true
  95         if not THREAD_LIMIT or threadc < THREAD_LIMIT then
  96                 local now = os.time()
  97                 for i, server in ipairs(reading) do
  98                         local client = server:accept()
  99                         if client then
 100                                 threadm[client] = now
 101                                 threadc = threadc + 1
 102                                 threads[client] = coroutine.create(clhandler[server])
 103                         end
 104                 end
 105         end
 106
 107         for client, thread in pairs(threads) do
 108                 coroutine.resume(thread, client)
 109                 local now = os.time()
 110                 if coroutine.status(thread) == "dead" then
 111                         threadc = threadc - 1
 112                         threads[client] = nil
 113                 elseif threadm[client] and threadm[client] + THREAD_TIMEOUT < now then
 114                         threads[client] = nil
 115                         threadc = threadc - 1
 116                         client:close()
 117                 elseif not threadi[client] then
 118                         threadm[client] = now
 119                         idle = false
 120                 end
 121         end
 122
 123         if idle then
 124                 socket.sleep(THREAD_IDLEWAIT)
 125         end
 126 end