PHP Timisoara Meetup April 2016

LARGE-SCALE WEBSITES PHP Meetup Timisoara | April 2016 @gbtekkie PERFORMANCE
OPTIMISATION TRICKS Airline case study

@gbtekkie PHP meetup Timisoara | April 2016 Georgiana Gligor ✓
Geek. Mother. Do-er.  ✓ Crafting enterprise-level applications in PHP since 2003 ✓ Architecture and DevOps consultant ✓ PHP Cluj Meetup Organizer 2

@gbtekkie PHP meetup Timisoara | April 2016 ✓ low cost
airline, similar to Ryan Air / Wizzair / EasyJet ✓ clever strategy of using airports, so that they don’t have a direct competition on 90% of their routes ✓ use their own reservation system (no GDS) ✓ selling models: website, call-centre Customer 3

@gbtekkie PHP meetup Timisoara | April 2016 Legacy 4

@gbtekkie PHP meetup Timisoara | April 2016 Wanted ▸ enable
end-user to purchase a full travel experience based on the destination, not just cheap plane tickets ▸ ﬂexibility ▸ scalability ▸ be in front of the competition by withstanding the Black Friday + Cyber Monday test ▸ move at the speed of a greenﬁeld project even if the business is up and running 5

@gbtekkie PHP meetup Timisoara | April 2016 ▸ polyglot technology
stack - Java reservations engine - LAMP for the web-facing part ▸ handle geographically distributed teams - 10 timezones - round-the-clock development ▸ replace legacy monolithic app Constraints 6

@gbtekkie PHP meetup Timisoara | April 2016 (1) booking path
(2) online check-in (3) Cyber Monday preparation Milestones 7

TECHNOLOGY STACK

@gbtekkie PHP meetup Timisoara | April 2016 Legacy as data
9

@gbtekkie PHP meetup Timisoara | April 2016 RESTful services access
data transactional 10

@gbtekkie PHP meetup Timisoara | April 2016 Isolate high traffic
11

@gbtekkie PHP meetup Timisoara | April 2016 Web-facing components 12

WELCOME SILOS

@gbtekkie PHP meetup Timisoara | April 2016 1 silo =
full setup of servers that run each application component and deliver the end-to-end functionality ✓ frontend (Drupal, Javascript SPAs) ✓ backend (Symfony services) ✓ cache What is a silo 14

@gbtekkie PHP meetup Timisoara | April 2016 Silo diagram 15

STATIC DATA

@gbtekkie PHP meetup Timisoara | April 2016 Static data 17

@gbtekkie PHP meetup Timisoara | April 2016 Optimise access to
static data 18

ANATOMY OF A SILO

@gbtekkie PHP meetup Timisoara | April 2016 The pieces (dispatcher)
20

@gbtekkie PHP meetup Timisoara | April 2016 Data access 21

@gbtekkie PHP meetup Timisoara | April 2016 Data caching 22

FIXTURES

@gbtekkie PHP meetup Timisoara | April 2016 Fixtures 24

@gbtekkie PHP meetup Timisoara | April 2016 ▸ enforces discussing
contracts before doing actual coding ▸ helps eliminate certain problems by having them discussed in advance ▸ allows developers to work independently and run all the stack on their machine ▸ each component is independently tested Fixture-based development 25

PARALLELISM

@gbtekkie PHP meetup Timisoara | April 2016 ▸ asynchronously process
multiple cURL handles ▸ same good old cURL, but on steroids ▸ curl_multi Parallel PHP 27

@gbtekkie PHP meetup Timisoara | April 2016 Parallelism in practice
28

@gbtekkie PHP meetup Timisoara | April 2016 Anatomy of a
Symfony service 29

THE 204 TRICK

@gbtekkie PHP meetup Timisoara | April 2016 ▸ HTTP status
code 204 ▸ success code ▸ Content-Length: 0 ▸ the backend acknowledges the request and will carry on ▸ the client can continue processing The 204 trick 31

@gbtekkie PHP meetup Timisoara | April 2016 ▸ TODO: add
diagram 204 trick in action 32

@gbtekkie PHP meetup Timisoara | April 2016 POST /batch-process public
function batchProcessAction() { // 1 - check permissions // 2 - validate user data // 3 - return 204 No Content // 4 - process batch } Batch processing example 33

@gbtekkie PHP meetup Timisoara | April 2016 Close connection: raw
PHP public function closeConnection() { header('HTTP/1.0 204 No Content'); header('Content-Length: 0', true); header('Content-Type: application/json', true); flush(); // or ob_flush() } 34

@gbtekkie PHP meetup Timisoara | April 2016 Close connection: Symfony-specific
public function closeConnection(Request $request) { $response = new StreamedResponse(); $response->setStatusCode(204); $response->headers->add(array('Connection' => 'close')); $c = function () { /* do nothing */ }; $response->setCallback($c); // needs to be a valid PHP callable $response->prepare($request); // ensure compliancy with HTTP specification $response->send(); return $response; } 35

@gbtekkie PHP meetup Timisoara | April 2016 ▸ cheap ▸
does not impact application performance ▸ logs are searchable ▸ logs tell the story of a user’s journey ▸ greatly help debugging Event logging system 36

@gbtekkie PHP meetup Timisoara | April 2016 Event logging system
37

38

39

ERROR HANDLING

@gbtekkie PHP meetup Timisoara | April 2016 ▸ recoverable user
can continue inside the booking path ▸ non-recoverable user’s checkin process can’t proceed Error types 41

@gbtekkie PHP meetup Timisoara | April 2016 4xx status codes
▸ 401 unauthorised ▸ 403 forbidden ▸ 409 conﬂict ▸ 413 payload too large instruct the UI where to go back Recoverable errors 42

@gbtekkie PHP meetup Timisoara | April 2016 ▸ 5xx status
codes ▸ 500 internal server error ▸ 503 service unavailable Non-recoverable errors 43

LESSONS LEARNED

@gbtekkie PHP meetup Timisoara | April 2016 ▸ silos Lessons
learned 45

@gbtekkie PHP meetup Timisoara | April 2016 ▸ silos ▸
static data Lessons learned 46

static data ▸ ﬁxtures Lessons learned 47

static data ▸ ﬁxtures ▸ delegate responsibility Lessons learned 48

static data ▸ ﬁxtures ▸ delegate responsibility ▸ parallelism Lessons learned 49

Georgiana Gligor @gbtekkie THANK YOU!

PHP Timisoara Meetup April 2016

PHP Timisoara Meetup April 2016

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