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CACHING THE UNCACHEABLE
BY THIJS FERYN
WITH VARNISH
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Slow websites
SUCK
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WEB PERFORMANCE IS AN
ESSENTIAL PART OF THE
USER EXPERIENCE
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SLOW ~ DOWN
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THROWING
SERVERS
AT THE PROBLEM
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MO' MONEY
MO' SERVERS
MO' PROBLEMS
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IDENTIFY SLOWEST PARTS
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OPTIMIZE
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AFTER A WHILE YOU HIT THE LIMITS
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CACHE
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HI, I'M THIJS
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I'M AN
EVANGELIST
AT
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4,800,000 WEBSITES
19% OF THE TOP 10K WEBSITES
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I'M @THIJSFERYN
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NORMALLY
USER SERVER
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WITH REVERSE CACHING PROXY
USER PROXY SERVER
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CONTROLLING THE CACHE WITH HTTP
Expires: Sat, 09 Sep 2017 14:30:00 GMT
Cache-control: public, max-age=3600, s-maxage=86400
Cache-control: private, no-cache, no-store
Vary: Accept-Language
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STATE
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STATE
~
USER SPECIFIC DATA
COOKIES
AUTH
HEADERS
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FOR YOUR EYES ONLY
NOT CACHED
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VARNISH CONFIGURATION LANGUAGE
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vcl 4.1;
sub vcl_recv {
if (req.http.Cookie) {
set req.http.Cookie = ";" + req.http.Cookie;
set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
set req.http.Cookie = regsuball(req.http.Cookie,
";(SESS[a-z0-9]+|SSESS[a-z0-9]+|NO_CACHE)=", "; \1=");
set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");
set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");
if (req.http.Cookie == "") {
unset req.http.Cookie;
}
else {
return (pass);
}
}
}
Only
keep certain
cookies
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sub vcl_recv {
if (req.http.Cookie) {
set req.http.Cookie = ";" + req.http.Cookie;
set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
set req.http.Cookie = regsuball(req.http.Cookie, ";(language)=", "; \1=");
set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");
set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");
if (req.http.cookie ~ "^\s*$") {
unset req.http.cookie;
return(pass);
}
return(hash);
}
}
sub vcl_hash {
hash_data(regsub( req.http.Cookie, "^.*language=([^;]*);*.*$", "\1" ));
}
Cookie
cache
variation
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vcl 4.1;
import cookieplus;
sub vcl_recv {
cookieplus.keep("language");
cookieplus.write();
}
sub vcl_hash {
hash_data(cookieplus.get("language"));
}
VMOD_COOKIE
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CONTAINS
USER
INFORMATION
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NO CACHE
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PLACEHOLDERS
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SEPARATE
HTTP REQUEST
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AJAX
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✓CLIENT-SIDE
✓COMMON KNOWLEDGE
✓PARALLEL PROCESSING
✓GRACEFUL
DEGRADATION
-PROCESSED BY THE
BROWSER
-EXTRA ROUNDTRIPS
-SOMEWHAT SLOWER
AJAX
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EDGE-SIDE INCLUDES ESI
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ESI
✓ PLACEHOLDER
✓ PARSED BY VARNISH
✓ OUTPUT IS A COMPOSITION OF BLOCKS
✓ STATE PER BLOCK
✓ TTL PER BLOCK
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sub vcl_recv {
set req.http.Surrogate-Capability = "key=ESI/1.0";
}
sub vcl_backend_response {
if (beresp.http.Surrogate-Control ~ "ESI/1.0") {
unset beresp.http.Surrogate-Control;
set beresp.do_esi = true;
}
}
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✓SERVER-SIDE
✓STANDARDIZED
✓PROCESSED ON THE
“EDGE”, NOT IN THE
BROWSER
✓GENERALLY FASTER
-SEQUENTIAL*
-ONE FAILS, ALL FAIL
-LIMITED
IMPLEMENTATION IN
VARNISH
-NOT THAT COMMON
ESI PARALLEL IN
ENTERPRISE
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NON-CACHEABLE ROUTES WILL STILL BE A
TARGET FOR LOAD/LATENCY
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NOT JUST A CACHE
NOT JUST "TAKE IT OR LEAVE IT"
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AN HTTP
LOGIC BOX
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DECISION MAKING AT THE EDGE
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vcl 4.1;
import cookieplus;
import redis;
import synthbackend;
sub vcl_init
{
new db = redis.db(
location="redis:6379",
type=master,
connection_timeout=500,
shared_connections=false,
max_connections=1);
}
sub vcl_recv
{
set req.http.X-Login = "false";
set req.http.x-session = cookieplus.get("PHPSESSID","guest");
if(req.http.x-session != "guest") {
db.command("EXISTS");
db.push("sf_s"+cookieplus.get("PHPSESSID"));
db.execute();
if(db.get_integer_reply() == 1) {
set req.http.X-Login = "true";
}
}
}
SYNTHETIC HTTP
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sub vcl_backend_fetch
{
if(bereq.url == "/session") {
if(bereq.http.X-Login != "true") {
set bereq.backend = synthbackend.from_string("{}");
return(fetch);
}
db.command("EVAL");
db.push({"
local session = redis.call('GET', KEYS[1])
if session == nil then
return '{}'
end
local result = string.gsub(session, '[%c]', '')
local username = string.gsub(result,'.+Userusername\";s:[0-9]+:\"([^\"]+)\";.+','%1')
if username == nil then
return '{}'
end
return '{"username":"'.. username ..'"}'
"});
db.push(1);
db.push("sf_s"+cookieplus.get("PHPSESSID"));
db.execute();
set bereq.backend = synthbackend.from_string(db.get_string_reply());
}
}
sub vcl_backend_response
{
if(bereq.url == "/session") {
set beresp.http.Content-Type = "application/json; charset=utf-8";
set beresp.ttl = 3600s;
set beresp.http.vary = "x-session";
}
}
REDIS LUA
CODE
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USER
GET /session
Cookie: PHPSESSID=7er3hjKal8u235c87u6ih0vz8Y
HTTP/1.1 200 OK
Content-Length: 31
Content-Type: application/json; charset=utf-8
X-Varnish: 163854 196622
Age: 27
{"username":"thijs"}
VARNISH
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WHAT DO YOU DO WITH IT?
✓ AJAX CALL
✓ LOAD VIA ESI AND PROCESS VIA LOCAL JAVASCRIPT
✓ EDGESTASH
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{{ EDGESTASH }}
VARNISH
MODULE FOR MUSTACHE
PROCESSING ON THE
EDGE
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vcl 4.1;
import edgestash;
backend default
{
.host = "1.1.1.1";
.port = "80";
}
sub vcl_backend_response {
if (bereq.url == "/session") {
edgestash.index_json();
} else if (bereq.url == "/") {
edgestash.parse_response();
}
}
sub vcl_deliver {
if (req.url == "/" && edgestash.is_edgestash()) {
edgestash.add_json_url("/session");
edgestash.execute();
}
}
EDGESTASH
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EDGESTASH
{"username":"Thijs"}
{{ username }}
Thijs
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MORE FLEXIBILITY
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Surrogate-Control: edgestash="EDGESTASH/2.1"
Link: ; rel=edgestash
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vcl 4.1;
import edgestash;
import std;
backend default
{
.host = "1.1.1.1";
}
sub vcl_recv
{
set req.http.Surrogate-Capability={"edgestash="EDGESTASH/2.1""};
}
sub vcl_backend_response
{
if(beresp.http.Link) {
std.collect(beresp.http.Link,",");
}
if(beresp.http.Link ~ "<([^>]+)>; rel=edgestash") {
set beresp.http.x-edgestash-json-urls = regsuball(beresp.http.Link,"(?(?=<[^>]+>; rel=edgestash)<([^>]+)>;
rel=edgestash|<([^>]+)>; rel=[a-z]+, )","\1");
}
if(beresp.http.Surrogate-Control) {
std.collect(beresp.http.Surrogate-Control);
}
if(beresp.http.Surrogate-Control ~ {".*="EDGESTASH/2\.[0-9]+".*"}) {
edgestash.parse_response();
}
}
EDGESTASH
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sub vcl_deliver
{
if(edgestash.is_edgestash() && resp.http.x-edgestash-json-urls) {
edgestash.add_json_url_csv(resp.http.x-edgestash-json-urls);
edgestash.execute();
}
unset resp.http.Link;
unset resp.http.x-edgestash-json-urls;
unset resp.http.surrogate-control;
}
EDGESTASH
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COMPOSER REQUIRE THIJSFERYN/EDGESTASH-TWIG-BUNDLE
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{{ edgestash('username','/session') }}
{{ username | edgestash('username','/session') }}
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{% if isEdgestash() %}
//Edgestash-supported logic
{% else %}
//Regular Twig logic
{% endif %}
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{{ edgestash('#username', '/session') }}
Welcome {{ edgestash('username') }}
{{ edgestash('/username') }}
{{ edgestash('^username') }}
Welcome guest
{{ edgestash('/username') }
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-
{{ edgestash('#.', '/users') }}
- {{ edgestash('username') }} {{ edgestash('/.') }}
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FROM $0.20/H + 14 DAYS FREE TRIAL
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HTTPS://FERYN.EU
HTTPS://TWITTER.COM/THIJSFERYN
HTTPS://INSTAGRAM.COM/THIJSFERYN