Asynchronous API Interaction with Guzzle

Guzzle is an HTTP client library in PHP that puts all the power of cURL at your fingertips. Part of cURL’s power comes from its “Multi” interface, which allows you to make concurrent HTTP requests using non-blocking I/O. Guzzle's HTTP handler implementation abstracts the complexity of cURL Multi into a simpler experience using Promises and PSR-7. Learn how to use Guzzle to work with HTTP requests and web service APIs in an asynchronous way, potentially saving you time and increasing the throughput of your PHP applications and services. (First delivered at ZendCon 2015)

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1. Asynchronous API Interaction with Guzzle by Jeremy Lindblom (@jeremeamia)
4. About Me @jeremeamia
5. Async API Interaction with Guzzle • Guzzle • cURL • HTTP • PSR-7 • Async • Promises • Coroutines
6. A HTTP Client library for PHP Guzzle
7. What is Guzzle? • HTTP Client for PHP • Wrapper for cURL • PSR-7 compliant • Popular PHP Lib ◦ 5700+ stars ◦ 15,000,000+ installs HTTP Request HTTP Response PHP Web Application Web Service
8. My favorite thing about Guzzle is..
9. No CURLOPTs
10. What is Guzzle? GitHub Repository Composer Package guzzle/guzzle guzzlehttp/guzzle guzzle/psr7 guzzlehttp/psr7 guzzle/promises guzzlehttp/promises v6 Docs: http://guzzlephp.org
11. HyperText Transfer Protocol (a.k.a. what makes the interwebz work) HTTP
20. HTTP Message Interfaces PSR-7
22. • FIG = Framework Interoperability Group • PSR = PHP Standards Recommendation ◦ PSR-0, PSR-4 – Autoloading ◦ PSR-1, PSR-2 – Coding style ◦ PSR-3 – Logging interface ◦ PSR-7 – HTTP Message Interfaces PHP-FIG
23. PSR-7
24. PSR-7
25. PSR-7
26. Now, let’s get back to... Guzzle PHP + HTTP + PSR-7 = Guzzle
27. Using Guzzle – Instantiate
28. Using Guzzle – Requests
29. Using Guzzle – Requests (alt.)
30. Using Guzzle – Responses
32. Guzzle is Designed for Async
33. Guzzle is Designed for Async Requests
34. Using Guzzle Asynchronously
35. Main Ingredient of Async Awesomesauce “It’s a real wicked pissah!” – ⭑⭑⭑⭑⭑, Boston Herald Promises
36. What is Promise? “A promise (is an object that) represents the eventual result of an asynchronous operation.” — Promises/A+ Specification
37. What is Promise? • A pending promise may be resolved by being... ◦ Fulfilled with a result ◦ Rejected with a reason • A resolved promise is immutable • A promise has a method
38. Then...
39. Then...
40. Then – For Guzzle Requests
41. Then – Return Values of Callbacks When the callback... returns a new promise that is... Returns a value Fulfilled with that value Returns a Pending until that is resolved Throws an exception Rejected with that thrown exception
42. Simple Example #1 – Manipulate value
43. Simple Example #2 – Chained Promises … …
44. Simple Example #2 – Chained Promises
45. Concurrent Async Requests
46. Old Guzzle (concurrency w/ batching) New Guzzle (concurrency w/ async)
47. Async and Promises are Awesome!
48. WAIT!!!
49. Wait – Coming Back from Async Land
50. So... how does all this stuff work?
51. Guzzle Powered by magic and rainbows
53. HTTP Handlers • CurlHandler – via • MultiCurlHandler – via • StreamHandler – via • ProxyHandler – all of the above; default • MockHandler – for testing • (insert your custom handler here)
54. Interface for Handlers (and Middleware)
55. ReactPHP Guzzle Handler …
56. Example #1 S3 Uploads in the AWS SDK for PHP
65. Coroutines -ing your way to a better world
66. Coroutines -ing your way to a better world This is probably where I’ll lose you.
67. What is a Coroutine?
68. What is a Coroutine? • A function that can suspend & resume its execution • Cooperates with another function (hence the “co”) • Uses the syntax • It’s what happens when Generators go Super Saiyan
69. What are Coroutines in Async? • Coroutines yield s and have the results sent back in to resume execution • Coroutines are also s.
70. Why? Enables you to write asynchronous code logic as if it is procedural.
71. Example #2 API authentication workflow
72. N Y N Y Y N
75. Asynchronous API Interaction with Guzzle by Jeremy Lindblom (@jeremeamia)