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--[[
HTTP server implementation for LuCI - core
(c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
$Id$
]]--
module("luci.httpd", package.seeall)
require("socket")
require("luci.util")
function Socket(ip, port)
local sock, err = socket.bind( ip, port )
if sock then
sock:settimeout( 0, "t" )
end
return sock, err
end
Thread = luci.util.class()
function Thread.__init__(self, socket, func)
self.socket = socket
self.routine = coroutine.create(func)
self.stamp = os.time()
self.waiting = false
end
function Thread.touched(self)
return self.stamp
end
function Thread.iswaiting(self)
return self.waiting
end
function Thread.receive(self, ...)
local chunk, err, part
self.waiting = true
while true do
chunk, err, part = self.socket:receive(...)
if err ~= "timeout" then
self.waiting = false
return chunk, err, part
end
coroutine.yield()
end
end
function Thread.resume(self, ...)
return coroutine.resume(self.routine, self, ...)
end
function Thread.isdead(self)
return coroutine.status(self.routine) == "dead"
end
function Thread.touch(self)
self.stamp = os.time()
end
Daemon = luci.util.class()
function Daemon.__init__(self, threadlimit, waittime, timeout)
self.reading = {}
self.threads = {}
self.handler = {}
self.waiting = {}
self.threadc = 0
setmetatable(self.waiting, {__mode = "v"})
self.debug = false
self.threadlimit = threadlimit
self.waittime = waittime or 0.1
self.timeout = timeout or 90
end
function Daemon.remove_dead(self, thread)
if self.debug then
self:dprint("Completed " .. tostring(thread))
end
thread.socket:close()
self.threadc = self.threadc - 1
self.threads[thread.socket] = nil
end
function Daemon.kill_timedout(self)
local now = os.time()
for sock, thread in pairs(self.threads) do
if os.difftime(now, thread:touched()) > self.timeout then
self.threads[sock] = nil
self.threadc = self.threadc - 1
sock:close()
end
end
end
function Daemon.dprint(self, msg)
if self.debug then
io.stderr:write("[daemon] " .. msg .. "\n")
end
end
function Daemon.register(self, sock, clhandler, errhandler)
table.insert( self.reading, sock )
self.handler[sock] = { clhandler = clhandler, errhandler = errhandler }
end
function Daemon.run(self)
while true do
self:step()
end
end
function Daemon.step(self)
local input, output, err = socket.select( self.reading, nil, 0 )
local working = false
-- accept new connections
for i, connection in ipairs(input) do
local sock = connection:accept()
if sock then
-- check capacity
if not self.threadlimit or self.threadc < self.threadlimit then
if self.debug then
self:dprint("Accepted incoming connection from " .. sock:getpeername())
end
local t = Thread(sock, self.handler[connection].clhandler)
self.threads[sock] = t
self.threadc = self.threadc + 1
if self.debug then
self:dprint("Created " .. tostring(t))
end
-- reject client
else
self:kill_timedout()
if self.debug then
self:dprint("Rejected incoming connection from " .. sock:getpeername())
end
if self.handler[connection].errhandler then
self.handler[connection].errhandler( sock )
end
sock:close()
end
end
end
-- create client handler
for sock, thread in pairs( self.threads ) do
-- resume working threads
if not thread:iswaiting() then
if self.debug then
self:dprint("Resuming " .. tostring(thread))
end
local stat, err = thread:resume()
if stat and not thread:isdead() then
thread:touch()
if not thread:iswaiting() then
working = true
else
table.insert(self.waiting, sock)
end
else
self:remove_dead(thread)
end
if self.debug then
self:dprint(tostring(thread) .. " returned")
if not stat then
self:dprint("Error in " .. tostring(thread) .. " " .. err)
end
end
end
end
-- check for data on waiting threads
input, output, err = socket.select( self.waiting, nil, 0 )
for i, sock in ipairs(input) do
local thread = self.threads[sock]
thread:resume()
if thread:isdead() then
self:remove_dead(thread)
else
thread:touch()
if not thread:iswaiting() then
for i, s in ipairs(self.waiting) do
if s == sock then
table.remove(self.waiting, i)
break
end
end
if not working then
working = true
end
end
end
end
if err == "timeout" and not working then
self:kill_timedout()
socket.sleep(self.waittime)
end
end
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