Using ngx_lua in UPYUN 2

Using ngx_lua in UPYUN 2
Monkey Zhang (timebug)
2015.11 @ Beijing OpenResty Con

Email: timebug.info@gmail.com
Github: https://github.com/timebug
A Systems Engineer at UPYUN

$ ./configure --prefix=/opt/nginx
--add-module=/path/to/lua-nginx-module
http {
server {
listen 8080;
location /add {
set $res '';
rewrite_by_lua '
local a = tonumber(ngx.var.arg_a) or 0
local b = tonumber(ngx.var.arg_b) or 0
ngx.var.res = a + b
';
content_by_lua '
ngx.say(ngx.var.res)
';
}
}
}
$ curl 'http://localhost:8080/add?a=6&b=7'
13

UPYUN CDN & API is built on top of
NGINX with ngx_lua
Why not use OpenResty?

40000+ lines Lua
lua-resty-sniff
lua-resty-limit-req
lua-resty-rewrite lua-resty-argutils
lua-resty-dbcache
lua-resty-anticc
lua-resty-combo
lua-resty-httpipe
lua-resty-checkups
lua-resty-17monip
lua-resty-httproxy
. . .

Project Structure:
NGINX with ngx_lua
~/project/upyun/marco
!"" Makefile
!"" README.md
!"" addons
#   %"" ngx_upxxx_module
!"" deps
!"" nginx
#   !"" app
#   #   !"" etc
#   #   # %"" config.lua
#   #   !"" lib
#   #   #   %"" resty
#   #   #   %"" httpipe.lua
#   #   %"" src
#   #   !"" modules
#   #   # %"" referer.lua
#   # !"" marco_init.lua
#   # %"" marco_log.lua
#   %"" conf
#   %"" nginx.conf
!"" patches
!"" tests
%"" util
!"" deps
!"" lua-releng
%"" ver.cfg
/usr/local/marco
!"" luajit
%"" nginx
   !"" app
   #   !"" etc
   #   # %"" config.lua
   #   !"" lib
   #   # !"" cjson.so
   #   #   %"" resty
   #   #   %"" httpipe.lua
   #   %"" src
   #   !"" modules
   #   # %"" referer.lua
   # !"" marco_init.lua
   # %"" marco_log.lua
   !"" conf
   #   %"" nginx.conf
   !"" html
   !"" logs
   %"" sbin
%"" nginx
make install

Project Structure:
Quick Start & Run
make deps
make conﬁgure
make
make install
util/ver.cfg
V_PCRE=8.34
V_NGINX=1.7.10
V_LUAJIT=2.1-20150223
V_LUA_CJSON=2.1.0
V_NGX_DEVEL_KIT=0.2.19
V_NGX_LUA_MODULE=0.9.15
Makefile
INSTALL_LIBDIR=$(PREFIX)/nginx/app/lib/
configure: deps luajit
@echo "==== Configuring Nginx $(V_NGINX) ===="
cd $(NGINX_DIR) && ./configure
--with-pcre=$(ROOTDIR)/deps/pcre-$(V_PCRE)
--with-ld-opt="-Wl,-rpath,$(LUAJIT_LIB),-rpath,$(INSTALL_LIBDIR)"
--add-module=$(ROOTDIR)/deps/ngx_devel_kit-$(V_NGX_DEVEL_KIT)
--add-module=$(ROOTDIR)/deps/lua-nginx-module-$(V_NGX_LUA_MODULE)
--prefix=$(PREFIX)/nginx
@echo "==== Successfully configure Nginx $(V_NGINX) ===="

Project Structure:
Development & Test
make dev
make test
Makefile
test:
util/lua-releng
py.test tests/test_marco.py
tests/test_marco.py
class TestMarco(unittest.TestCase):
@no_error_log(["error"])
@grep_error_log(level=["info"],
log_pattern="SSL_do_handshake[(][)] failed",
log_out=["SSL_do_handshake() failed"])
def test_ssl_handler_no_certificate(self):
fake_resp = self.curl_ssl(sni="fake.com", verbose=True)
self.assertTrue("alert handshake failure" in fake_resp)

nginx.conf service
server_name *.b0.upaiyun.com Custom Domain Binding
valid_referers, allow, deny
Custom Antileech Rules and Redirect:
ip, user-agent, referer, token etc.
expires 7d
Custom Cache Control:
support speciﬁc URI rules etc.
ssl_certiﬁcate* ssl_stapling* Custom SSL
upstream { server 127.0.0.1 }
Custom CDN Origin:
support multi-network routing etc.
max_fails=3 fail_timeout=30s
health_check (*)
Custom Health Check Strategy:
passive, active
round-robin, ip_hash, hash (1.7.2+) Custom Load Balancing Strategy
rewrite Custom URL rewrite
… …

upstream blog.upyun.com {
server 192.168.11.1:8080 weight=1 max_fails=10 fail_timeout=30s;
server 192.168.11.2:8080 weight=2 max_fails=10 fail_timeout=30s;
server 192.168.11.3:8080 weight=1 max_fails=10 fail_timeout=30s backup;
proxy_next_upstream error timeout http_500;
proxy_next_upstream_tries 2;
}

Lua Upstream Configuration:
lua-resty-checkups
-- app/etc/config.lua
_M.global = {
checkup_timer_interval = 5,
checkup_timer_overtime = 60,
}
_M.api = {
timeout = 2,
typ = "general", -- http, redis, mysql etc.
cluster = {
{ -- level 1
try = 2,
servers = {
{ host = "192.168.11.1", port = 8080, weight = 1 },
{ host = "192.168.11.2", port = 8080, weight = 2 },
}
},
{ -- level 2
servers = {
{ host = "192.168.11.3", port = 8080, weight = 1 },
}
},
},
}
cosocket
redis
http
mysql
memcached
…

Lua Upstream Health Checks:
lua-resty-checkups
access_by_lua '
local checkups = require "resty.checkups"
-- only one timer is active among all the nginx workers
checkups.create_checker()
';

checkups with nginx.conf
-- app/etc/config.lua
_M.global = {
checkup_timer_interval = 5,
checkup_timer_overtime = 60,
ups_status_sync_enable = true,
ups_status_timer_interval = 2,
}
_M.blog = {
cluster = {
{ -- level 1
try = 2,
upstream = "blog.upyun.com",
},
{ -- level 2
upstream = "blog.upyun.com",
upstream_only_backup = true,
},
},
}
lua-upstream-nginx-module

checkups with status page

Lua Upstream Dynamically:
Conﬁgure Everything as JSON
{
"bucket:upblog": [
{
"fail_timeout": 30,
"host": "192.168.11.1",
"max_fails": 3,
"port": 8080,
"weight": 1
},
{
"fail_timeout": 30,
"host": "192.168.11.2",
"max_fails": 3,
"port": 8080,
"weight": 2
},
{
"backup": true,
"fail_timeout": 30,
"host": "192.168.11.3",
"max_fails": 3,
"port": 8080,
"weight": 1
}
]
}
master slave

Lua Metadata Cache:
lua-resty-shcache
-- app/src/modules/metadata.lua
local shcache = require "resty.shcache"
function _M.get_metadata(bucket)
local lookup_metadata = function ()
-- fetch from redis
return res
end
local cache_data = shcache:new(
ngx.shared.metadata,
{ external_lookup = lookup_metadata,
encode = cmsgpack.pack,
decode = cmsgpack.unpack,
},
{ positive_ttl = cache_positive_ttl,
negative_ttl = cache_negative_ttl,
name = "metadata",
})
-- local key = ...
local data, _ = cache_data:load(key)
if not data then
return
end
return data
end

Lua Metadata Cache:
lua-resty-dbcache
HIT
STALE
HIT_NEGATIVE
NO_DATA
MISS
??? (NET_ERR)

Lua Upstream Dynamically:
maintaining internal state
max_fails=10
fail_timeout=30s
lua-resty-lrucache
lua-resty-shcache
{
"bucket:upblog": [ . . . ]
}

Lua Upstream Load Balancing:
round-robin with weight
function _M.reset_round_robin_state(cls)
local rr = { index = 0, current_weight = 0 }
rr.gcd, rr.max_weight, rr.weight_sum = _M.calc_gcd_weight(cls.servers)
cls.rr = rr
end
cluster = {
{
servers = {
{ host = "127.0.0.1", port = 12351, weight = 1 },
{ host = "127.0.0.1", port = 12352, weight = 4 },
{ host = "127.0.0.1", port = 12353, weight = 3 },
{ host = "127.0.0.1", port = 12355, weight = 6 },
}
}
}
rr.index = 0
rr.current_weight = 0
rr.gcd = 1
rr.max_weight = 6
rr.weight_sum = 14

local bad_servers = {}
for i = 1, #cls.servers, 1 do
local srv, index, err = _M.select_round_robin_server(cls, verify_server_status, bad_servers)
if not srv then
return nil, err
else
local res, _ = callback(srv)
if res then
if srv.effective_weight ~= srv.weight then
srv.effective_weight = srv.weight
_M.reset_round_robin_state(cls)
end
return res
end
if srv.effective_weight > 1 then
srv.effective_weight = floor(sqrt(srv.effective_weight))
end
bad_servers[index] = true
end
end
local try_servers_by_round_robin = function(cls, verify_server_status, callback)

function _M.select_round_robin_server(cls, verify_server_status, bad_servers)
local rr = cls.rr
local servers = cls.servers
local index = rr.index
local current_weight = rr.current_weight
local gcd = rr.gcd
local max_weight = rr.max_weight
local weight_sum = rr.weight_sum
local failed = 1
repeat
until failed > weight_sum
TA
LK
IS
C
H
EA
P

index = index % #servers + 1
if index == 1 then
current_weight = current_weight - gcd
if current_weight <= 0 then current_weight = max_weight end
end
local srv = servers[index]
if srv.effective_weight >= current_weight then
cls.rr.index, cls.rr.current_weight = index, current_weight
if not bad_servers[index] then
if verify_server_status then
if verify_server_status(srv) then
return srv, index
else
if srv.effective_weight > 1 then
srv.effective_weight, index, current_weight, failed_count = 1, 0, 0, 0
gcd, max_weight, weight_sum = cls.rr.gcd, cls.rr.max_weight, cls.rr.weight_sum
end
failed = failed + 1
end
else
return srv, index
end
else
failed = failed + 1
end
end
repeat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . until failed > weight_sum

local verify_server_status = function(srv)
local peer_key = _gen_key(srv)
local peer_status = cjson.decode(state:get(PEER_STATUS_PREFIX .. peer_key))
if peer_status == nil or peer_status.status ~= _M.STATUS_ERR then
return true
end
return
end
STATUS_OK = 0
STATUS_UNSTABLE = 1
STATUS_ERR = 2

=== TEST 1: round-robin single level
--- http_config eval
"$::HttpConfig" . "$::InitConfig"
--- config
location = /t {
content_by_lua '
local checkups = require "resty.checkups"
checkups.create_checker()
ngx.sleep(2)
local dict = {
[12351] = "A",
[12352] = "B",
[12353] = "C",
[12355] = "E",
}
local cb_ok = function(srv)
ngx.print(dict[srv.port])
return 1
end
for i = 1, 30, 1 do
local ok, err = checkups.ready_ok("single_level", cb_ok)
if err then
ngx.say(err)
end
end
';
}
--- request
GET /t
--- response_body: EEBEBCEBCEABCEEEBEBCEBCEABCEEE
_M.single_level = {
cluster = {
{
servers = {
{ host = "127.0.0.1", port = 12351, weight = 1 },
{ host = "127.0.0.1", port = 12352, weight = 4 },
{ host = "127.0.0.1", port = 12353, weight = 3 },
{ host = "127.0.0.1", port = 12355, weight = 6 },
}
}
}
}
EEBEBCEBCEABCE
. . . . . .

consistent-hash and more
try_servers_by_round_robin
try_cluster_by_round_robin
cluster = {
{
servers = {
{ host = "127.0.0.1", port = 12351, weight = 1 },
{ host = "127.0.0.1", port = 12352, weight = 4 },
{ host = "127.0.0.1", port = 12353, weight = 3 },
{ host = "127.0.0.1", port = 12355, weight = 6 },
}
},
{
servers = {
{ host = "127.0.0.1", port = 12354, weight = 1 },
{ host = "127.0.0.1", port = 12356, weight = 2 },
}
}
}
try_servers_by_consistent_hash
try_cluster_by_consistent_hash

"$WHEN($MATCH($_URI, '^/foo/.*'))$ADD_REQ_HEADER(X-Foo, bar)"
tianchaijz:
Marco: I GOT IT !
Edge Server

Lua Custom URL rewrite:
lua-resty-rewrite | variables
$_HOST
$_HOST_n
$_GET_name
$_COOKIE_name
$_POST_name
$_HEADER_name
$_RANDOM$_RANDOM_n
$_URI
$_QUERY
$_SYM_sym
$_SCHEME$_METHOD

lua-resty-rewrite | functions
$ALL(E1, E2, ...)
$SUB(E1, from, to)
$PCALL(E)
$DECODE_BASE64(E)
$WHEN(E1, E2, ...)
$ADD_REQ_HEADER(E1, E2)$GT(E1, E2)
$MATCH(E1, E2)
$LOWER(E)
$UPPER(E)
$ENCODE_BASE64(E)
$GE(E1, E2)
$EQ(E1, E2)
$ANY(E1, E2, ...)
$DEL_REQ_HEADER(E1)
$ADD_RSP_HEADER(E1, E2)

lua-resty-rewrite | break
rewrite /download/(.*)/(.*) /$1/$2.mp3?_session=$_COOKIE_id?
rewrite /download/(.*)/(.*) /$1/$2.mp3?user=$_HOST_1 break
. . .
See More: https://github.com/upyun/docs/issues/5

http://io.upyun.com/2015/03/09/hello-world/?foo=bar
[scheme] [host] [path] [query]

Lua Custom Cache-Control:
Using specific URI rules
location ^~ /www/ {
if ($query_string ~* "foo=bar") {
expires 300s;
}
}
location ^~ /images/ {
expires 1h;
}
location ~* .jpg$ {
expires 1d;
}

Lua Custom SSL:
Certiﬁcates Load & OCSP stapling
server {
listen 443 ssl;
server_name upyun.com;
ssl_certificate upyun.com.pem;
ssl_certificate_key upyun.com.key;
ssl_stapling on;
ssl_stapling_verify on;
ssl_trusted_certificate /etc/ssl/private/ca-certs.pem;
}

Lua Custom Logging:
lua-resty-logger-socket
log_format combined '$remote_addr - $remote_user [$time_local] '
'"$request" $status $body_bytes_sent '
'"$http_referer" "$http_user_agent"';
server {
access_log /path/to/access.log combined buffer=4096;
. . .
}
EdgeServer
UPYUNLOG
bucket:hbimg = {"enable":true,"ratio":0.1}
logger.log(cjson.encode(log_msg_table) .. "n")

UPYUN LOG Platform:
HAProxy + Heka + Kafka + Elasticsearch + Kibana

location /upload {
proxy_request_buffering off;
. . .
}

Lua Streaming Upload
ngx.req.init_body()
ngx.req.append_body(chunk)
ngx.req.finish_body()

Lua CDN
Lua WAF
Lua SSL
Lua API

Thanks
Nginx ngx_lua agentzh Lua
blog.cloudﬂare.com Openresty LuaJIT Github
Maxim Dounin Igor Sysoev chaoslawful
https://groups.google.com/forum/#!forum/OpenResty
Ansible Michael Pall Open source
…

Using ngx_lua in UPYUN 2

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