/usr/share/lua/5.1/copas.lua is in lua-copas 1.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Copas - Coroutine Oriented Portable Asynchronous Services
--
-- A dispatcher based on coroutines that can be used by TCP/IP servers.
-- Uses LuaSocket as the interface with the TCP/IP stack.
--
-- Authors: Andre Carregal, Javier Guerra, and Fabio Mascarenhas
-- Contributors: Diego Nehab, Mike Pall, David Burgess, Leonardo Godinho,
-- Thomas Harning Jr., and Gary NG
--
-- Copyright 2005 - Kepler Project (www.keplerproject.org)
--
-- $Id: copas.lua,v 1.37 2009/04/07 22:09:52 carregal Exp $
-------------------------------------------------------------------------------
if package.loaded["socket.http"] then
error("you must require copas before require'ing socket.http")
end
local socket = require "socket"
local coxpcall = require "coxpcall"
local WATCH_DOG_TIMEOUT = 120
local UDP_DATAGRAM_MAX = 8192
-- Redefines LuaSocket functions with coroutine safe versions
-- (this allows the use of socket.http from within copas)
local function statusHandler(status, ...)
if status then return ... end
local err = (...)
if type(err) == "table" then
return nil, err[1]
else
error(err)
end
end
function socket.protect(func)
return function (...)
return statusHandler(coxpcall.pcall(func, ...))
end
end
function socket.newtry(finalizer)
return function (...)
local status = (...)
if not status then
coxpcall.pcall(finalizer, select(2, ...))
error({ (select(2, ...)) }, 0)
end
return ...
end
end
-- end of LuaSocket redefinitions
local copas = {}
-- Meta information is public even if beginning with an "_"
copas._COPYRIGHT = "Copyright (C) 2005-2010 Kepler Project"
copas._DESCRIPTION = "Coroutine Oriented Portable Asynchronous Services"
copas._VERSION = "Copas 1.1.7"
-- Close the socket associated with the current connection after the handler finishes
copas.autoclose = true
-------------------------------------------------------------------------------
-- Simple set implementation based on LuaSocket's tinyirc.lua example
-- adds a FIFO queue for each value in the set
-------------------------------------------------------------------------------
local function newset()
local reverse = {}
local set = {}
local q = {}
setmetatable(set, { __index = {
insert = function(set, value)
if not reverse[value] then
set[#set + 1] = value
reverse[value] = #set
end
end,
remove = function(set, value)
local index = reverse[value]
if index then
reverse[value] = nil
local top = set[#set]
set[#set] = nil
if top ~= value then
reverse[top] = index
set[index] = top
end
end
end,
push = function (set, key, itm)
local qKey = q[key]
if qKey == nil then
q[key] = {itm}
else
qKey[#qKey + 1] = itm
end
end,
pop = function (set, key)
local t = q[key]
if t ~= nil then
local ret = table.remove (t, 1)
if t[1] == nil then
q[key] = nil
end
return ret
end
end
}})
return set
end
local _servers = newset() -- servers being handled
local _reading_log = {}
local _writing_log = {}
local _reading = newset() -- sockets currently being read
local _writing = newset() -- sockets currently being written
-------------------------------------------------------------------------------
-- Coroutine based socket I/O functions.
-------------------------------------------------------------------------------
-- reads a pattern from a client and yields to the reading set on timeouts
-- UDP: a UDP socket expects a second argument to be a number, so it MUST
-- be provided as the 'pattern' below defaults to a string. Will throw a
-- 'bad argument' error if omitted.
function copas.receive(client, pattern, part)
local s, err
pattern = pattern or "*l"
repeat
s, err, part = client:receive(pattern, part)
if s or err ~= "timeout" then
_reading_log[client] = nil
return s, err, part
end
_reading_log[client] = os.time()
coroutine.yield(client, _reading)
until false
end
-- receives data from a client over UDP. Not available for TCP.
-- (this is a copy of receive() method, adapted for receivefrom() use)
function copas.receivefrom(client, size)
local s, err, port
size = size or UDP_DATAGRAM_MAX
repeat
s, err, port = client:receivefrom(size) -- upon success err holds ip address
if s or err ~= "timeout" then
_reading_log[client] = nil
return s, err, port
end
_reading_log[client] = os.time()
coroutine.yield(client, _reading)
until false
end
-- same as above but with special treatment when reading chunks,
-- unblocks on any data received.
function copas.receivePartial(client, pattern)
local s, err, part
pattern = pattern or "*l"
repeat
s, err, part = client:receive(pattern)
if s or ( (type(pattern)=="number") and part~="" and part ~=nil ) or
err ~= "timeout" then
_reading_log[client] = nil
return s, err, part
end
_reading_log[client] = os.time()
coroutine.yield(client, _reading)
until false
end
-- sends data to a client. The operation is buffered and
-- yields to the writing set on timeouts
-- Note: from and to parameters will be ignored by/for UDP sockets
function copas.send(client, data, from, to)
local s, err,sent
from = from or 1
local lastIndex = from - 1
repeat
s, err, lastIndex = client:send(data, lastIndex + 1, to)
-- adds extra corrotine swap
-- garantees that high throuput dont take other threads to starvation
if (math.random(100) > 90) then
_writing_log[client] = os.time()
coroutine.yield(client, _writing)
end
if s or err ~= "timeout" then
_writing_log[client] = nil
return s, err,lastIndex
end
_writing_log[client] = os.time()
coroutine.yield(client, _writing)
until false
end
-- sends data to a client over UDP. Not available for TCP.
-- (this is a copy of send() method, adapted for sendto() use)
function copas.sendto(client, data, ip, port)
local s, err,sent
repeat
s, err = client:sendto(data, ip, port)
-- adds extra corrotine swap
-- garantees that high throuput dont take other threads to starvation
if (math.random(100) > 90) then
_writing_log[client] = os.time()
coroutine.yield(client, _writing)
end
if s or err ~= "timeout" then
_writing_log[client] = nil
return s, err
end
_writing_log[client] = os.time()
coroutine.yield(client, _writing)
until false
end
-- waits until connection is completed
function copas.connect(skt, host, port)
skt:settimeout(0)
local ret, err
repeat
ret, err = skt:connect (host, port)
if ret or err ~= "timeout" then
_writing_log[skt] = nil
return ret, err
end
_writing_log[skt] = os.time()
coroutine.yield(skt, _writing)
until false
return ret, err
end
-- flushes a client write buffer (deprecated)
function copas.flush(client)
end
-- wraps a TCP socket to use Copas methods (send, receive, flush and settimeout)
local _skt_mt = {__index = {
send = function (self, data, from, to)
return copas.send (self.socket, data, from, to)
end,
receive = function (self, pattern)
if (self.timeout==0) then
return copas.receivePartial(self.socket, pattern)
end
return copas.receive(self.socket, pattern)
end,
flush = function (self)
return copas.flush(self.socket)
end,
settimeout = function (self,time)
self.timeout=time
return
end,
}}
-- wraps a UDP socket, copy of TCP one adapted for UDP.
-- Mainly adds sendto() and receivefrom()
local _skt_mt_udp = {__index = {
send = function (self, data)
return copas.send (self.socket, data)
end,
sendto = function (self, data, ip, port)
return copas.sendto (self.socket, data, ip, port)
end,
receive = function (self, size)
return copas.receive (self.socket, (size or UDP_DATAGRAM_MAX))
end,
receivefrom = function (self, size)
return copas.receivefrom (self.socket, (size or UDP_DATAGRAM_MAX))
end,
flush = function (self)
return copas.flush (self.socket)
end,
settimeout = function (self,time)
self.timeout=time
return
end,
}}
function copas.wrap (skt)
if string.sub(tostring(skt),1,3) == "udp" then
return setmetatable ({socket = skt}, _skt_mt_udp)
else
return setmetatable ({socket = skt}, _skt_mt)
end
end
--------------------------------------------------
-- Error handling
--------------------------------------------------
local _errhandlers = {} -- error handler per coroutine
function copas.setErrorHandler (err)
local co = coroutine.running()
if co then
_errhandlers [co] = err
end
end
local function _deferror (msg, co, skt)
print (msg, co, skt)
end
-------------------------------------------------------------------------------
-- Thread handling
-------------------------------------------------------------------------------
local function _doTick (co, skt, ...)
if not co then return end
local ok, res, new_q = coroutine.resume(co, skt, ...)
if ok and res and new_q then
new_q:insert (res)
new_q:push (res, co)
else
if not ok then coxpcall.pcall (_errhandlers [co] or _deferror, res, co, skt) end
if skt and copas.autoclose then skt:close() end
_errhandlers [co] = nil
end
end
-- accepts a connection on socket input
local function _accept(input, handler)
local client = input:accept()
if client then
client:settimeout(0)
local co = coroutine.create(handler)
_doTick (co, client)
--_reading:insert(client)
end
return client
end
-- handle threads on a queue
local function _tickRead (skt)
_doTick (_reading:pop (skt), skt)
end
local function _tickWrite (skt)
_doTick (_writing:pop (skt), skt)
end
-------------------------------------------------------------------------------
-- Adds a server/handler pair to Copas dispatcher
-------------------------------------------------------------------------------
local function addTCPserver(server, handler, timeout)
server:settimeout(timeout or 0.1)
_servers[server] = handler
_reading:insert(server)
end
local function addUDPserver(server, handler, timeout)
server:settimeout(timeout or 0)
local co = coroutine.create(handler)
_reading:insert(server)
_doTick (co, server)
end
function copas.addserver(server, handler, timeout)
if string.sub(tostring(server),1,3) == "udp" then
addUDPserver(server, handler, timeout)
else
addTCPserver(server, handler, timeout)
end
end
-------------------------------------------------------------------------------
-- Adds an new courotine thread to Copas dispatcher
-------------------------------------------------------------------------------
function copas.addthread(thread, ...)
if type(thread) ~= "thread" then
thread = coroutine.create(thread)
end
_doTick (thread, nil, ...)
return thread
end
-------------------------------------------------------------------------------
-- tasks registering
-------------------------------------------------------------------------------
local _tasks = {}
local function addtaskRead (tsk)
-- lets tasks call the default _tick()
tsk.def_tick = _tickRead
_tasks [tsk] = true
end
local function addtaskWrite (tsk)
-- lets tasks call the default _tick()
tsk.def_tick = _tickWrite
_tasks [tsk] = true
end
local function tasks ()
return next, _tasks
end
-------------------------------------------------------------------------------
-- main tasks: manage readable and writable socket sets
-------------------------------------------------------------------------------
-- a task to check ready to read events
local _readable_t = {
events = function(self)
local i = 0
return function ()
i = i + 1
return self._evs [i]
end
end,
tick = function (self, input)
local handler = _servers[input]
if handler then
input = _accept(input, handler)
else
_reading:remove (input)
self.def_tick (input)
end
end
}
addtaskRead (_readable_t)
-- a task to check ready to write events
local _writable_t = {
events = function (self)
local i = 0
return function ()
i = i + 1
return self._evs [i]
end
end,
tick = function (self, output)
_writing:remove (output)
self.def_tick (output)
end
}
addtaskWrite (_writable_t)
local last_cleansing = 0
-------------------------------------------------------------------------------
-- Checks for reads and writes on sockets
-------------------------------------------------------------------------------
local function _select (timeout)
local err
local now = os.time()
local duration = os.difftime
_readable_t._evs, _writable_t._evs, err = socket.select(_reading, _writing, timeout)
local r_evs, w_evs = _readable_t._evs, _writable_t._evs
if duration(now, last_cleansing) > WATCH_DOG_TIMEOUT then
last_cleansing = now
for k,v in pairs(_reading_log) do
if not r_evs[k] and duration(now, v) > WATCH_DOG_TIMEOUT then
_reading_log[k] = nil
r_evs[#r_evs + 1] = k
r_evs[k] = #r_evs
end
end
for k,v in pairs(_writing_log) do
if not w_evs[k] and duration(now, v) > WATCH_DOG_TIMEOUT then
_writing_log[k] = nil
w_evs[#w_evs + 1] = k
w_evs[k] = #w_evs
end
end
end
if err == "timeout" and #r_evs + #w_evs > 0 then
return nil
else
return err
end
end
-------------------------------------------------------------------------------
-- Dispatcher loop step.
-- Listen to client requests and handles them
-- Returns false if no data was handled (timeout), or true if there was data
-- handled (or nil + error message)
-------------------------------------------------------------------------------
function copas.step(timeout)
local err = _select (timeout)
if err == "timeout" then return false end
if err then
error(err)
end
for tsk in tasks() do
for ev in tsk:events() do
tsk:tick (ev)
end
end
return true
end
-------------------------------------------------------------------------------
-- Dispatcher endless loop.
-- Listen to client requests and handles them forever
-------------------------------------------------------------------------------
function copas.loop(timeout)
while true do
copas.step(timeout)
end
end
return copas
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