Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Building a Swift Web API and Application Together
Search
Kyle Fuller
March 02, 2017
Technology
2
1.9k
Building a Swift Web API and Application Together
Kyle Fuller
March 02, 2017
Tweet
Share
More Decks by Kyle Fuller
See All by Kyle Fuller
Design APIs and deliver what you promised
kylef
0
74
Preparing for the future of API Description Languages
kylef
0
90
Resilient API Design
kylef
1
310
Testing without Xcode - CMD+U 2016
kylef
0
230
End-to-end: Building a Web Service in Swift (MCE 2016)
kylef
2
470
Designing APIs for Humans - Write the Docs 2016
kylef
0
300
Embracing Change - MBLTDev 2015
kylef
3
650
Practical Declarative Programming (360 iDev 2015)
kylef
3
480
Building Resilient API Clients (SLUG)
kylef
2
13k
Other Decks in Technology
See All in Technology
AWSアカウントのセキュリティ自動化、どこまで進める? 最適な設計と実践ポイント
yuobayashi
7
850
1行のコードから社会課題の解決へ: EMの探究、事業・技術・組織を紡ぐ実践知 / EM Conf 2025
9ma3r
12
4.3k
生成AI×財務経理:PoCで挑むSlack AI Bot開発と現場巻き込みのリアル
pohdccoe
1
780
LINEギフトにおけるバックエンド開発
lycorptech_jp
PRO
0
370
技術スタックだけじゃない、業務ドメイン知識のオンボーディングも同じくらいの量が必要な話
niftycorp
PRO
0
110
AIエージェント入門
minorun365
PRO
32
19k
Cracking the Coding Interview 6th Edition
gdplabs
14
28k
開発組織を進化させる!AWSで実践するチームトポロジー
iwamot
2
460
EMConf JP 2025 懇親会LT / EMConf JP 2025 social gathering
sugamasao
2
200
フォーイット_エンジニア向け会社紹介資料_Forit_Company_Profile.pdf
forit_tech
1
1.7k
AWS Well-Architected Frameworkで学ぶAmazon ECSのセキュリティ対策
umekou
2
150
4th place solution Eedi - Mining Misconceptions in Mathematics
rist
0
150
Featured
See All Featured
Typedesign – Prime Four
hannesfritz
40
2.5k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
44
7k
The Cost Of JavaScript in 2023
addyosmani
47
7.4k
Statistics for Hackers
jakevdp
797
220k
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.7k
We Have a Design System, Now What?
morganepeng
51
7.4k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
4
430
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
45
9.4k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
Designing for Performance
lara
604
68k
Unsuck your backbone
ammeep
669
57k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
6
570
Transcript
Building a Swift Web API and Application Together Kyle Fuller
Agenda —API Design —Building API in Swift —Deploying API in
Swift in production
API Design
What makes a good API?
What makes a good API? —Decoupled from implementation details —Able
to evolve without breaking existing clients
Example: Pagination
GET /posts
GET /posts{?page}
GET /posts?page=2
None
None
! How can we solve?
GET /posts{?before}
GET /posts?before=44
How do we introduce changes to our API?
Versioning APIs
/v1/posts{?page} /v2/posts{?before}
/posts{?page} /posts{?before}
API is coupled to implementation details
API is coupled to implementation details
What happens when you version an API?
What happens when you version an API?
How can we design the API without exposing implementation details?
REST Representational State Transfer
Anticipating change is one of the central themes of REST
Evolvability
Tight Coupling
"You can’t have evolvability if clients have their controls baked
into their design at deployment"
"Controls have to be learned on the fly. That’s what
hypermedia enables"
Hypermedia
Web Linking RFC 5988
GET /posts Link: </posts?before=30>; rel="next", </posts?before=120>; rel="last"
GET /posts?before=120 Link: </posts?before=90>; rel="prev", </posts>; rel="first"
WebLinking.swift https://github.com/kylef/WebLinking.swift
WebLinking: Checking for next link if let link = response.findLink(relation:
"next") { print("We have a next link with the URI: \(link.uri).") }
WebLinking: Introspecting Available Links for link in response.links { print("Relation:
\(link.relationType)") print("URI: \(link.uri)") }
application/hal+json
Blog Post { "title": "My First Blog Post", "body": "Lorem
Ipsum" }
Blog Post (Next Link) { "title": "My First Blog Post",
"body": "Lorem Ipsum", "_links": [ { "href": "/posts/2", "relation": "next" } ] }
Blog Post (Self) { "title": "My First Blog Post", "body":
"Lorem Ipsum", "_links": [ { "href": "/posts/1", "relation": "self" }, { "href": "/posts/2", "relation": "next" } ] }
Blog Post (Comments) { "title": "My First Blog Post", "body":
"Lorem Ipsum", "_links": [ { "href": "/posts/1", "relation": "self" }, { "href": "/posts/2", "relation": "next" }, { "href": "/posts/1/comments", "relation": "comments" }, ] }
Blog Post (Embedded Comments) { "_embed": { "comments": [ {
"author": "Kyle", "body": "That's a really interesting post!" "_links": [ { "href": "/posts/1/comments/1", "relation": "self" } ] } ] } }
application/ vnd.siren+json
Delete Post { "properties": { "title": "My First Blog Post",
"body": "Lorem Ipsum", }, "actions": [ { "name": "delete", "method": "DELETE", "href": "/posts/1" } ] }
Delete Post { "properties": { "title": "My First Blog Post",
"body": "Lorem Ipsum", }, "actions": [ { "name": "delete", "method": "DELETE", "href": "/posts/1" } ] }
Create Comment { "properties": { "title": "My First Blog Post",
"body": "Lorem Ipsum", }, "actions": [ { "name": "comment", "method": "POST", "href": "/posts/1/comments", "fields": [ { "name": "author", "type": "string" }, { "name": "message", "type": "string" } ] } ] }
Create Comment (Logged in) { "properties": { "title": "My First
Blog Post", "body": "Lorem Ipsum", }, "actions": [ { "name": "comment", "method": "POST", "href": "/posts/1/comments", "fields": [ { "name": "message", "type": "string" } ] } ] }
Hypermedia —Remove implementation details from interface —Keep business logic on
back-end, not front-end
Building an API in Swift
Web Frameworks
Web Frameworks —Frank —IBM Kitura —Vapor
Frank vs Kitura vs Vapor
Frank get("users", *) { (request, username: String) in return "Hello
\(username)" }
Server APIs Working Group
Server APIs Working Group
Useful Tools —Templating Languages —Stencil —Data Persistence —Redis (Redbird) —PostgreSQL
Testing
XCTest class PersonTests: XCTestCase { let person = Person(name: "Kyle")
func testPersonName() { XCTAssertEqual(person.name, "Kyle") } func testPersonDescription() { XCTAssertEqual(person.description, "Kyle") } }
extension PersonTests: XCTestCaseProvider { var allTests : [(String, () throws
-> Void)] { return [ ("testPersonName", testPersonName), ("testPersonDescription", testPersonDescription), ] } } XCTMain([ PersonTests(), ])
Dredd https://github.com/apiaryio/dredd
API Blueprint # GET /hello + Response 200 (application/json) {
"name": "Kyle" }
Dredd Testing $ dredd \ apidescription.apib \ https://localhost:8080 ✔ GET
/hello ✔ API Matches API Description
Deployment
https://github.com/kylef/heroku-buildpack-swift
$ cat Package.swift import PackageDescription let package = Package( name:
"Hello", dependencies: [ .Package(url: "https://github.com/nestproject/Frank.git", majorVersion: 0, minor: 3), ] )
$ cat Sources/main.swift import Frank get { _ in return
"Hello World" } get(*) { (_, username: String) in return "Hello \(username)" }
$ cat Sources/main.swift import Frank get { _ in return
"Hello World" } get(*) { (_, username: String) in return "Hello \(username)" }
$ cat .swift-version 3.0.2
$ cat .swift-version 3.0.2
$ swift build $ .build/debug/Hello [INFO] Listening at http://0.0.0.0:8000 (48827)
[INFO] Booting worker process with pid: 48828
$ cat Procfile web: Hello
$ heroku create --buildpack https://github.com/kylef/heroku-buildpack-swift.git $ git push heroku master
remote: -----> Swift app detected remote: -----> Installing 3.0.2 remote: -----> Installing clang-3.7.0 remote: -----> Building Package remote: -----> Copying binaries to 'bin'
None
None
None
Manual Deployment
Monitoring
Logging
print("ERROR: Connection to database failed \(error)")
Papertrail
None
None
Conclusion —API Design —Swift Web Services —Tools & Frameworks —Testing
—Deployment —Monitoring
Conclusion —API Design —Swift Web Services —Tools & Frameworks —Testing
—Deployment —Monitoring
kylefuller https://fuller.li/talks