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Building a Swift Web API and Application Together
Kyle Fuller
March 02, 2017
Technology
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Building a Swift Web API and Application Together
Kyle Fuller
March 02, 2017
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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