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-- simple epoll-based socket example. Serves up http responses, but is of course not a proper server
-- you can test performance with ab -n 100000 -c 100 http://localhost:8000/ although ab may be the limiting factor
local S
if arg[1] == "rump" then
S = require "syscall.rump.init".init{"net", "net.net", "net.local", "net.netinet"}
else
S = require "syscall"
end
local t, c = S.t, S.c
local function assert(cond, s, ...)
if cond == nil then error(tostring(s)) end -- annoyingly, assert does not call tostring!
return cond, s, ...
end
local maxevents = 1024
local poll
local function nilf() return nil end
-- this is somewhat working toward a common API but needs a lot more work, but has resulted in some improvements
if S.epoll_create then
poll = {
init = function(this)
return setmetatable({fd = assert(S.epoll_create())}, {__index = this})
end,
event = t.epoll_event(),
add = function(this, s)
local event = this.event
event.events = c.EPOLL.IN
event.data.fd = s:getfd()
assert(this.fd:epoll_ctl("add", s, event))
end,
events = t.epoll_events(maxevents),
get = function(this)
local f, a, r = this.fd:epoll_wait(this.events)
if not f then
print("error on fd", a)
return nilf
else
return f, a, r
end
end,
eof = function(ev) return ev.HUP or ev.ERR or ev.RDHUP end,
}
elseif S.kqueue then
poll = {
init = function(this)
return setmetatable({fd = assert(S.kqueue())}, {__index = this})
end,
event = t.kevents(1),
add = function(this, s)
local event = this.event[1]
event.fd = s
event.setfilter = "read"
event.setflags = "add"
assert(this.fd:kevent(this.event, nil, 0))
end,
events = t.kevents(maxevents),
get = function(this)
local f, a, r = this.fd:kevent(nil, this.events)
if not f then
print("error on fd", a)
return nilf
else
return f, a, r
end
end,
eof = function(ev) return ev.EOF or ev.ERROR end,
}
else
error("no epoll or kqueue support")
end
local s = assert(S.socket("inet", "stream, nonblock"))
s:setsockopt("socket", "reuseaddr", true)
local sa = assert(t.sockaddr_in(8000, "127.0.0.1"))
assert(s:bind(sa))
assert(s:listen(128))
local ep = poll:init()
ep:add(s)
local w = {}
local msg = [[
<html>
<head>
<title>performance test</title>
</head>
<body>
test
</body>
</html>
]]
local reply = table.concat({
"HTTP/1.0 200 OK",
"Content-type: text/html",
"Connection: close",
"Content-Length: " .. #msg,
"",
"",
}, "\r\n") .. msg
local bufsize = 4096
local buffer = t.buffer(bufsize)
local ss = t.sockaddr_storage()
local function loop()
for i, ev in ep:get() do
if ep.eof(ev) then
ev.fd:close()
w[ev.fd] = nil
end
if ev.fd == s:getfd() then -- server socket, accept
repeat
local a, err = s:accept(ss, nil, "nonblock")
if a then
ep:add(a)
w[a:getfd()] = a
end
until not a
else
local fd = w[ev.fd]
fd:read(buffer, bufsize)
local n = fd:write(reply)
assert(n == #reply)
assert(fd:close())
w[ev.fd] = nil
end
end
return loop()
end
loop()
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