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Pol Piella Abadia - 📍Arc Latam Job Fair 🌍
-
17/11/22
Exploring the power of Swift
beyond App development
@polpielladev
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🧑💻 Senior iOS Engineer @ BBC iPlayer
📍 From Barcelona
🇬🇧 Based in Manchester
❤ Swift and developer tooling
👕 Random fact: I collect football shirts!
Hi, I’m Pol 👋
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🔨 I do as much as possible with Swift
📲 Swift way beyond app development
🔧 A lot of interesting Swift tools
🤞 Encourage you to use Swift more
📜 From script to full-stack
📦 A Swift package monorepo
🧑💻 Code examples for everyone!
A bit of context 🔊
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⛑ Type/Compiler safety
🦶 Low memory footprint
🤝 Great development experience
🧐 Familiarity
🌟 Mature and amazing community
Why Swift though?
https://greenlab.di.uminho.pt/wp-content/uploads/2017/10/sleFinal.pdf
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My development with other languages
https://twitter.com/ThePracticalDev/status/705825638851149824
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🔧 A tool to get an estimated reading
time for a markdown
fi
le
📖 Inspired by Medium’s reading time
feature - number of words / wpm.
✍ Written entirely in Swift
📦 Distributed as a Swift Package with
products such as a library,
executables, APIs and playgrounds.
🏃 I’ll take you through how to get it
running everywhere with just Swift!
Hi, Reading Time 👋
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Where it all began… 🔨
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Where it all began… 🔨
#!/usr/bin/env swift
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Where it all began… 🔨
#!/usr/bin/env swift
import Foundation
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Where it all began… 🔨
#!/usr/bin/env swift
import Foundation
// First argument is the path to the script
if CommandLine.arguments.count != 2 {
let argumentCount = CommandLine.arguments.count - 1
print("Expected 1 argument but got: \(argumentCount) instead...")
exit(1)
}
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Where it all began… 🔨
#!/usr/bin/env swift
import Foundation
// First argument is the path to the script
if CommandLine.arguments.count != 2 {
let argumentCount = CommandLine.arguments.count - 1
print("Expected 1 argument but got: \(argumentCount) instead...")
exit(1)
}
let pathToFile = CommandLine.arguments[1]
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Where it all began… 🔨
#!/usr/bin/env swift
import Foundation
// First argument is the path to the script
if CommandLine.arguments.count != 2 {
let argumentCount = CommandLine.arguments.count - 1
print("Expected 1 argument but got: \(argumentCount) instead...")
exit(1)
}
let pathToFile = CommandLine.arguments[1]
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(pathToFile)"),
let contents = String(data: data, encoding: .utf8) else {
print("🛑 Could not get contents for file...")
exit(1)
}
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Where it all began… 🔨
#!/usr/bin/env swift
import Foundation
// First argument is the path to the script
if CommandLine.arguments.count != 2 {
let argumentCount = CommandLine.arguments.count - 1
print("Expected 1 argument but got: \(argumentCount) instead...")
exit(1)
}
let pathToFile = CommandLine.arguments[1]
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(pathToFile)"),
let contents = String(data: data, encoding: .utf8) else {
print("🛑 Could not get contents for file...")
exit(1)
}
let contentWithoutEmojis = contents.removingEmoji
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Where it all began… 🔨
#!/usr/bin/env swift
import Foundation
// First argument is the path to the script
if CommandLine.arguments.count != 2 {
let argumentCount = CommandLine.arguments.count - 1
print("Expected 1 argument but got: \(argumentCount) instead...")
exit(1)
}
let pathToFile = CommandLine.arguments[1]
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(pathToFile)"),
let contents = String(data: data, encoding: .utf8) else {
print("🛑 Could not get contents for file...")
exit(1)
}
let contentWithoutEmojis = contents.removingEmoji
let timeIntervalInMinutes = Double(count(wordsIn: contentWithoutEmojis)) / Double(200)
let timeIntervalInSeconds = round(timeIntervalInMinutes * 60)
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Where it all began… 🔨
#!/usr/bin/env swift
import Foundation
// First argument is the path to the script
if CommandLine.arguments.count != 2 {
let argumentCount = CommandLine.arguments.count - 1
print("Expected 1 argument but got: \(argumentCount) instead...")
exit(1)
}
let pathToFile = CommandLine.arguments[1]
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(pathToFile)"),
let contents = String(data: data, encoding: .utf8) else {
print("🛑 Could not get contents for file...")
exit(1)
}
let contentWithoutEmojis = contents.removingEmoji
let timeIntervalInMinutes = Double(count(wordsIn: contentWithoutEmojis)) / Double(200)
let timeIntervalInSeconds = round(timeIntervalInMinutes * 60)
print(formattedString(from: timeIntervalInSeconds))
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Let’s run it!
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Can we make it better?
📈 Not very scalable
🤷 Only Foundation APIs can be used
🚨 System needs to have swift installed
to run the script
📦 Need a better way to distribute it…
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Let’s create a Swift Package
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Let’s create a Swift Package
swift package init --type library
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Let’s create a Swift Package
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(
name: "ReadingTime",
targets: ["ReadingTime"]
)
],
dependencies: [
],
targets: [
.target(
name: "ReadingTime",
dependencies: []),
.testTarget(
name: "ReadingTimeTests",
dependencies: ["ReadingTime"],
resources: [.copy("MockData")]
),
]
)
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Let’s create a Swift Package
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(
name: "ReadingTime",
targets: ["ReadingTime"]
)
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main")
],
targets: [
.target(
name: "ReadingTime",
dependencies: []),
.testTarget(
name: "ReadingTimeTests",
dependencies: ["ReadingTime"],
resources: [.copy("MockData")]
),
]
)
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Let’s create a Swift Package
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(
name: "ReadingTime",
targets: ["ReadingTime"]
)
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main")
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.testTarget(
name: "ReadingTimeTests",
dependencies: ["ReadingTime"],
resources: [.copy("MockData")]
),
]
)
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Moving the logic into the library
import Foundation
public enum ReadingTime {
public static func calculate(for content: String, wpm: Int = 200) -> TimeInterval {
}
}
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Moving the logic into the library
import Foundation
public enum ReadingTime {
public static func calculate(for content: String, wpm: Int = 200) -> TimeInterval {
let rewrittenMarkdown = MarkdownRewriter(text: content)
.rewrite()
}
}
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Moving the logic into the library
import Foundation
public enum ReadingTime {
public static func calculate(for content: String, wpm: Int = 200) -> TimeInterval {
let rewrittenMarkdown = MarkdownRewriter(text: content)
.rewrite()
let contentWithoutEmojis = rewrittenMarkdown.removingEmoji
}
}
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Moving the logic into the library
import Foundation
public enum ReadingTime {
public static func calculate(for content: String, wpm: Int = 200) -> TimeInterval {
let rewrittenMarkdown = MarkdownRewriter(text: content)
.rewrite()
let contentWithoutEmojis = rewrittenMarkdown.removingEmoji
let timeIntervalInMinutes = Double(count(wordsIn: contentWithoutEmojis)) / Double(wpm)
let timeIntervalInSeconds = timeIntervalInMinutes * 60
return round(timeIntervalInSeconds)
}
}
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But…
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Adding an executable target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")])
]
)
Adding an executable target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(
name: "ReadingTimeCLI",
dependencies: ["ReadingTime"]
)
]
)
Adding an executable target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/apple/swift-argument-parser", from: "1.1.4")
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(
name: "ReadingTimeCLI",
dependencies: ["ReadingTime"]
)
]
)
Adding an executable target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/apple/swift-argument-parser", from: "1.1.4")
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(
name: "ReadingTimeCLI",
dependencies: ["ReadingTime", .product(name: "ArgumentParser", package: "swift-argument-parser")]
)
]
)
Adding an executable target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
.executable(name: "ReadingTimeCLI", targets: ["ReadingTimeCLI"])
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/apple/swift-argument-parser", from: "1.1.4")
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(
name: "ReadingTimeCLI",
dependencies: ["ReadingTime", .product(name: "ArgumentParser", package: "swift-argument-parser")]
)
]
)
Adding an executable target
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Writing some code!
import Foundation
@main
struct ReadingTimeCLI {
}
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Writing some code!
import Foundation
import ArgumentParser
@main
struct ReadingTimeCLI: ParsableCommand {
}
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Writing some code!
import Foundation
import ArgumentParser
@main
struct ReadingTimeCLI: ParsableCommand {
@Argument(help: "The path to a markdown file to be analysed. Relative to the executable.")
var path: String
}
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Writing some code!
import Foundation
import ArgumentParser
@main
struct ReadingTimeCLI: ParsableCommand {
@Argument(help: "The path to a markdown file to be analysed. Relative to the executable.")
var path: String
func run() throws {
}
}
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Writing some code!
import Foundation
import ArgumentParser
@main
struct ReadingTimeCLI: ParsableCommand {
@Argument(help: "The path to a markdown file to be analysed. Relative to the executable.")
var path: String
func run() throws {
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(path)"),
let contents = String(data: data, encoding: .utf8) else {
throw "🛑 Could not get contents for file..."
}
}
}
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Writing some code!
import Foundation
import ArgumentParser
import ReadingTime
@main
struct ReadingTimeCLI: ParsableCommand {
@Argument(help: "The path to a markdown file to be analysed. Relative to the executable.")
var path: String
func run() throws {
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(path)"),
let contents = String(data: data, encoding: .utf8) else {
throw "🛑 Could not get contents for file..."
}
}
}
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Writing some code!
import Foundation
import ArgumentParser
import ReadingTime
@main
struct ReadingTimeCLI: ParsableCommand {
@Argument(help: "The path to a markdown file to be analysed. Relative to the executable.")
var path: String
func run() throws {
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(path)"),
let contents = String(data: data, encoding: .utf8) else {
throw "🛑 Could not get contents for file..."
}
let timeInterval = ReadingTime.calculate(for: contents)
}
}
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Writing some code!
import Foundation
import ArgumentParser
import ReadingTime
@main
struct ReadingTimeCLI: ParsableCommand {
@Argument(help: "The path to a markdown file to be analysed. Relative to the executable.")
var path: String
func run() throws {
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(path)"),
let contents = String(data: data, encoding: .utf8) else {
throw "🛑 Could not get contents for file..."
}
let timeInterval = ReadingTime.calculate(for: contents)
let dateFormatter: DateComponentsFormatter = {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .full
formatter.allowedUnits = [.minute, .second]
return formatter
}()
}
}
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import Foundation
import ArgumentParser
import ReadingTime
@main
struct ReadingTimeCLI: ParsableCommand {
@Argument(help: "The path to a markdown file to be analysed. Relative to the executable.")
var path: String
func run() throws {
guard let cwd = URL(string: FileManager.default.currentDirectoryPath),
let data = FileManager.default.contents(atPath: "\(cwd.path)/\(path)"),
let contents = String(data: data, encoding: .utf8) else {
throw "🛑 Could not get contents for file..."
}
let timeInterval = ReadingTime.calculate(for: contents)
let dateFormatter: DateComponentsFormatter = {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .full
formatter.allowedUnits = [.minute, .second]
return formatter
}()
print(dateFormatter.string(from: timeInterval) ?? "\(timeInterval) seconds")
}
}
Writing some code!
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Compiling for macOS
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Compiling for ubuntu
😥 Not as easy as the macOS compilation
✅ Cross compilation is an option
💻 Build for Linux but on macOS
📂 Need a destination.json
⛓ Need the target sdk and toolchain
💁 Pro tip: Don’t do it yourself!
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Compiling for ubuntu
🔗 https://github.com/keith/swiftpm-
linux-cross
⬇ Installs all required SDKs
📂 Creates destination.json
🤩 Gives you a swift build command you
can copy and paste
⚠ Version of swift for toolchains must
match the build version of Swift
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Compiling for ubuntu
setup-swiftpm-toolchain
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Compiling for ubuntu
setup-swiftpm-toolchain --ubuntu-release focal
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Compiling for ubuntu
setup-swiftpm-toolchain --ubuntu-release focal --arch arm64
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Compiling for ubuntu
setup-swiftpm-toolchain --ubuntu-release focal --arch arm64 --swift-version 5.6.2
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Compiling for ubuntu
setup-swiftpm-toolchain --ubuntu-release focal --arch arm64 --swift-version 5.6.2
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Compiling for ubuntu
📂 read-time
📂 toolchain-focal-arm64-5.6.2
destination_static.json
destination.json
📂 packages
📂 swift-5.6.2-RELEASE-ubuntu20.04-aarch64
setup-swiftpm-toolchain --ubuntu-release focal --arch arm64 --swift-version 5.6.2
swift build --destination ~/read-time/toolchain-focal-arm64-5.6.2/destination.json
swift build --static-swift-stdlib --destination ~/read-time/toolchain-focal-arm64-5.6.2/
destination_static.json
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Compiling for ubuntu
private static func count(wordsIn string: String) -> Int {
var count = 0
let range = string.startIndex.. () in
count += 1
})
return count
}
🛑 Some APIs are not available in all
toolchains
👉 Compiler directives can help with this
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Compiling for ubuntu
#if !os(Linux)
private static func count(wordsIn string: String) -> Int {
var count = 0
let range = string.startIndex.. () in
count += 1
})
return count
}
#else
private static func count(wordsIn string: String) -> Int {
let chararacterSet = CharacterSet
.whitespacesAndNewlines
.union(.punctuationCharacters)
let components = string
.components(separatedBy: chararacterSet)
let words = components.filter { !$0.isEmpty }
return words.count
}
#endif
🛑 Some APIs are not available in all
toolchains
👉 Compiler directives can help with this
🟰 The Windows build faces the same
issues
🧐 If you want to learn more about it, I
have an article on it.
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Compiling for windows
🛑 Docker and cross-compilations did not
work for me.
🔗 Resorted to a Github Action by
Saleem Abdulrasool
🏃 Runs in a windows machine
🧰 Sets up the Swift windows toolchain.
🎉 All I had to do was run swift build
on it
💁 Again, don’t do it yourself!
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Compiling for windows
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https://www.youtube.com/watch?v=bOMQiMxh5Bc
📣 The Browser Company’s Arc is going
to be available on Windows next year.
💻 It is macOS only and written in Swift.
💪 They decided to share the same
codebase and use Swift for the Windows
build.
👨💻 Many challenges ahead and a lot of
work to be done to set up the Windows
dev environment (Xcode, Instruments,
async/await, etc.).
🎉 Could be great for the community and
they will potentially open source the
work.
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✅ ✅
✅
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Creating an API
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")])
]
)
Let’s create a new target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(name: "ReadingTimeLambda", dependencies: [
])
]
)
Let’s create a new target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/swift-server/swift-aws-lambda-runtime.git", from: "0.1.0")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(name: "ReadingTimeLambda", dependencies: [
])
]
)
Let’s create a new target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/swift-server/swift-aws-lambda-runtime.git", from: "0.1.0")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(name: "ReadingTimeLambda", dependencies: [
.product(name: "AWSLambdaRuntime", package: "swift-aws-lambda-runtime")
])
]
)
Let’s create a new target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/swift-server/swift-aws-lambda-runtime.git", from: "0.1.0")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(name: "ReadingTimeLambda", dependencies: [
.product(name: "AWSLambdaRuntime", package: "swift-aws-lambda-runtime"),
.product(name: "AWSLambdaEvents", package: "swift-aws-lambda-runtime")
])
]
)
Let’s create a new target
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/swift-server/swift-aws-lambda-runtime.git", from: "0.1.0")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.executableTarget(name: "ReadingTimeLambda", dependencies: [
.product(name: "AWSLambdaRuntime", package: "swift-aws-lambda-runtime"),
.product(name: "AWSLambdaEvents", package: "swift-aws-lambda-runtime"),
"ReadingTime"
])
]
)
Let’s create a new target
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Lambda.run { (
context,
request: APIGateway.V2.Request,
callback: @escaping (Result) -> Void
) in
}
Writing a lambda!
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Lambda.run { (
context,
request: APIGateway.V2.Request,
callback: @escaping (Result) -> Void
) in
guard request.context.http.method == .POST, request.context.http.path == "/calculate" else {
return callback(.success(APIGateway.V2.Response(statusCode: .notFound)))
}
}
Writing a lambda!
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Lambda.run { (
context,
request: APIGateway.V2.Request,
callback: @escaping (Result) -> Void
) in
guard request.context.http.method == .POST, request.context.http.path == "/calculate" else {
return callback(.success(APIGateway.V2.Response(statusCode: .notFound)))
}
let request = try! jsonDecoder.decode(Request.self, from: request.body ?? "")
}
Writing a lambda!
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Lambda.run { (
context,
request: APIGateway.V2.Request,
callback: @escaping (Result) -> Void
) in
guard request.context.http.method == .POST, request.context.http.path == "/calculate" else {
return callback(.success(APIGateway.V2.Response(statusCode: .notFound)))
}
do {
let request = try jsonDecoder.decode(Request.self, from: request.body ?? "")
} catch {
print(error.localizedDescription)
callback(.success(APIGateway.V2.Response(statusCode: .badRequest)))
}
}
Writing a lambda!
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Lambda.run { (
context,
request: APIGateway.V2.Request,
callback: @escaping (Result) -> Void
) in
guard request.context.http.method == .POST, request.context.http.path == "/calculate" else {
return callback(.success(APIGateway.V2.Response(statusCode: .notFound)))
}
do {
let request = try jsonDecoder.decode(Request.self, from: request.body ?? "")
let readingTime = ReadingTime.calculate(for: request.content)
} catch {
print(error.localizedDescription)
callback(.success(APIGateway.V2.Response(statusCode: .badRequest)))
}
}
Writing a lambda!
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Lambda.run { (
context,
request: APIGateway.V2.Request,
callback: @escaping (Result) -> Void
) in
guard request.context.http.method == .POST, request.context.http.path == "/calculate" else {
return callback(.success(APIGateway.V2.Response(statusCode: .notFound)))
}
do {
let request = try jsonDecoder.decode(Request.self, from: request.body ?? "")
let readingTime = ReadingTime.calculate(for: request.content)
let body = try jsonEncoder.encodeAsString(Response(time: readingTime))
callback(.success(APIGateway.V2.Response(
statusCode: .ok,
headers: ["content-type": "application/json"],
body: body
)))
} catch {
print(error.localizedDescription)
callback(.success(APIGateway.V2.Response(statusCode: .badRequest)))
}
}
Writing a lambda!
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Deploy it! 🚀
# Compile using a docker instance
docker run \
--rm \
--volume "$(pwd)/:/src" \
--workdir "/src/" \
swift:5.6-amazonlinux2 \
swift build --product ReadingTimeLambda \
-c release -Xswiftc -static-stdlib
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Deploy it! 🚀
# Compile using a docker instance
docker run \
--rm \
--volume "$(pwd)/:/src" \
--workdir "/src/" \
swift:5.6-amazonlinux2 \
swift build --product ReadingTimeLambda \
-c release -Xswiftc -static-stdlib
# Package into a `.zip` file for upload
# Script from the swift-server repo
./package.sh
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No content
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Making an online playground
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")])
]
)
Let’s create a new target, again!
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/vapor/vapor.git", from: "4.0.0")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")])
]
)
Let’s create a new target, again!
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/vapor/vapor.git", from: "4.0.0"),
.package(url: "https://github.com/JohnSundell/Plot.git", from: "0.5.0")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")])
]
)
Let’s create a new target, again!
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/vapor/vapor.git", from: "4.0.0"),
.package(url: "https://github.com/JohnSundell/Plot.git", from: "0.5.0")
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.target(
name: "ReadingTimeSite", dependencies: [
.product(name: "Vapor", package: "vapor"),
.product(name: "Plot", package: "plot"),
"ReadingTime"
],
swiftSettings: [
.unsafeFlags(["-cross-module-optimization"], .when(configuration: .release))
]
)
]
)
Let’s create a new target, again!
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// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
],
dependencies: [
.package(url: "https://github.com/apple/swift-markdown.git", branch: "main"),
.package(url: "https://github.com/vapor/vapor.git", from: "4.0.0"),
.package(url: "https://github.com/JohnSundell/Plot.git", from: "0.5.0"),
],
targets: [
.target(name: "ReadingTime", dependencies: [.product(name: "Markdown", package: "swift-markdown")]),
.target(
name: "ReadingTimeSite", dependencies: [
.product(name: "Vapor", package: "vapor"),
.product(name: "Plot", package: "plot"),
"ReadingTime"
],
swiftSettings: [
.unsafeFlags(["-cross-module-optimization"], .when(configuration: .release))
]
),
.executableTarget(name: "ReadingTimeSiteRunner", dependencies: ["ReadingTimeSite"])
]
)
Let’s create a new target, again!
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
)
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
)
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app")
)
)
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
)
)
)
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
),
.form(
)
)
)
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
),
.form(
.method(.post),
.id("playground"),
)
)
)
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
),
.form(
.method(.post),
.id("playground"),
.textarea(
.placeholder("Enter your markdown here!"),
.name("content"),
.attribute(named: "form", value: "playground")
)
)
)
)
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
),
.form(
.method(.post),
.id("playground"),
.textarea(
.placeholder("Enter your markdown here!"),
.name("content"),
.attribute(named: "form", value: "playground")
),
.h3("Estimated Reading Time: 🤷")
)
)
)
)
}
}
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Let’s write the website!
func routes(_ app: Application) throws {
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
),
.form(
.method(.post),
.id("playground"),
.textarea(
.placeholder("Enter your markdown here!"),
.name("content"),
.attribute(named: "form", value: "playground")
),
.h3("Estimated Reading Time: 🤷"),
.button(.type(.submit), "Calculate Reading Time!")
)
)
)
)
}
}
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No content
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Let’s add the missing route!
func routes(_ app: Application) throws {
app.post { request async throws -> Response in
}
}
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Let’s add the missing route!
func routes(_ app: Application) throws {
app.post { request async throws -> Response in
let formData = try request.content.decode(FormData.self)
}
}
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Let’s add the missing route!
func routes(_ app: Application) throws {
app.post { request async throws -> Response in
let formData = try request.content.decode(FormData.self)
let readingTime = ReadingTime.calculate(for: formData.content)
}
}
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Let’s add the missing route!
func routes(_ app: Application) throws {
app.post { request async throws -> Response in
let formData = try request.content.decode(FormData.self)
let readingTime = ReadingTime.calculate(for: formData.content)
let queryParam: String
if let readingTimeString = dateComponentsFormatter.string(from: readingTime) {
queryParam = "?readingTime=\(readingTimeString)"
} else {
queryParam = ""
}
}
}
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Let’s add the missing route!
func routes(_ app: Application) throws {
app.post { request async throws -> Response in
let formData = try request.content.decode(FormData.self)
let readingTime = ReadingTime.calculate(for: formData.content)
let queryParam: String
if let readingTimeString = dateComponentsFormatter.string(from: readingTime) {
queryParam = "?readingTime=\(readingTimeString)"
} else {
queryParam = ""
}
return request.redirect(to: "/\(queryParam)")
}
}
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Let’s write the website!
app.get { request async throws -> HTML in
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
),
.form(
.method(.post),
.id("playground"),
.textarea(
.placeholder("Enter your markdown here!"),
.name("content"),
.attribute(named: "form", value: "playground")
),
.h3("Estimated Reading Time: 🤷"),
.button(.type(.submit), "Calculate Reading Time!")
)
)
)
)
}
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Let’s write the website!
app.get { request async throws -> HTML in
let readingTime = try? request.query.get(String.self, at: "readingTime")
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
),
.form(
.method(.post),
.id("playground"),
.textarea(
.placeholder("Enter your markdown here!"),
.name("content"),
.attribute(named: "form", value: "playground")
),
.h3("Estimated Reading Time: 🤷"),
.button(.type(.submit), "Calculate Reading Time!")
)
)
)
)
}
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Let’s write the website!
app.get { request async throws -> HTML in
let readingTime = try? request.query.get(String.self, at: "readingTime")
return HTML(
.head(
.title("Reading Time Playground!"),
.stylesheet("https://unpkg.com/@picocss/pico@latest/css/pico.min.css"),
.stylesheet("index.css")
),
.body(
.div(
.class("app"),
.h1(
"Reading Time Playground!"
),
.form(
.method(.post),
.id("playground"),
.textarea(
.placeholder("Enter your markdown here!"),
.name("content"),
.attribute(named: "form", value: "playground")
),
.if(readingTime != nil, .h3("Estimated Reading Time: \(readingTime ?? "")")),
.button(.type(.submit), "Calculate Reading Time!")
)
)
)
)
}
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No content
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Calling Swift from Javascript?
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Let’s consider a HTML file
…
Test ReadingTime from Javascript!
Calculate!Slide 103
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WebAssembly is the 🔑!
🕸 A binary format compatible with
web technologies.
🧰 Can be compiled from languages
such as Swift, Go, Rust etc.
📂 Produces a .wasm
fi
le
⬇ .wasm
fi
les can be imported
from Javascript.
✅ The WebAssembly JS api is
widely supported.
https://webassembly.org/
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No content
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How to compile Swift code to wasm?
👐 SwiftWasm is Open Source and
provides a set of tools to compile
Swift to Wasm.
🧰 Forked swift toolchain to add
Wasm compatibility.
⚙ Executable targets can be built
to produce wasm binaries.
📚 There is an amazing book
available at: https://
book.swiftwasm.org
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Using JavascriptKit
📚 JavascriptKit is a library part of the
SwiftWasm organisation.
✅ Can interact with Javascript
through WebAssembly and Swift.
📦 Will make use of https://
github.com/swiftwasm/carton to
generate the wasm binary and the
needed JS ‘glue’ code.
📖 Read the values from the vanilla JS
site.
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Let’s go back to our Package.swift
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"])
],
dependencies: [
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]
)
]
)
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Let’s go back to our Package.swift
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"])
],
dependencies: [
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]
),
.executableTarget(
name: "ReadingTimeWasm", dependencies: [
]
)
]
)
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Let’s go back to our Package.swift
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"])
],
dependencies: [
.package(url: "https://github.com/swiftwasm/JavaScriptKit", from: "0.15.0")
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]
),
.executableTarget(
name: "ReadingTimeWasm", dependencies: [
]
)
]
)
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Let’s go back to our Package.swift
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"])
],
dependencies: [
.package(url: "https://github.com/swiftwasm/JavaScriptKit", from: "0.15.0")
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]
),
.executableTarget(
name: "ReadingTimeWasm", dependencies: [
.product(name: "JavaScriptKit", package: "JavaScriptKit")
]
)
]
)
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Let’s go back to our Package.swift
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"])
],
dependencies: [
.package(url: "https://github.com/swiftwasm/JavaScriptKit", from: "0.15.0")
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]
),
.executableTarget(
name: "ReadingTimeWasm", dependencies: [
.product(name: "JavaScriptKit", package: "JavaScriptKit"),
"ReadingTime"
]
)
]
)
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Let’s go back to our Package.swift
// swift-tools-version: 5.6
import PackageDescription
let package = Package(
name: "ReadingTime",
platforms: [.iOS(.v8), .macOS(.v12)],
products: [
.library(name: "ReadingTime", targets: ["ReadingTime"]),
.executable(name: "ReadingTimeWasm", targets: ["ReadingTimeWasm"])
],
dependencies: [
.package(url: "https://github.com/swiftwasm/JavaScriptKit", from: "0.15.0")
],
targets: [
.target(
name: "ReadingTime",
dependencies: [.product(name: "Markdown", package: "swift-markdown")]
),
.executableTarget(
name: "ReadingTimeWasm", dependencies: [
.product(name: "JavaScriptKit", package: "JavaScriptKit"),
"ReadingTime"
]
)
]
)
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Let’s write some code!
import JavaScriptKit
import ReadingTime
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Let’s write some code!
import JavaScriptKit
import ReadingTime
let document = JSObject.global.document
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Let’s write some code!
import JavaScriptKit
import ReadingTime
let document = JSObject.global.document
var readingTimeButton = document
.querySelector("#reading-time-calculate")
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Let’s write some code!
import JavaScriptKit
import ReadingTime
let document = JSObject.global.document
var readingTimeButton = document
.querySelector("#reading-time-calculate")
readingTimeButton.onclick = .object(JSClosure { _ in
})
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Let’s write some code!
import JavaScriptKit
import ReadingTime
let document = JSObject.global.document
var readingTimeButton = document
.querySelector("#reading-time-calculate")
readingTimeButton.onclick = .object(JSClosure { _ in
let element = document
.querySelector("#reading-time-content")
})
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Let’s write some code!
import JavaScriptKit
import ReadingTime
let document = JSObject.global.document
var readingTimeButton = document
.querySelector("#reading-time-calculate")
readingTimeButton.onclick = .object(JSClosure { _ in
let element = document
.querySelector("#reading-time-content")
let text = element.value.string
})
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Let’s write some code!
import JavaScriptKit
import ReadingTime
let document = JSObject.global.document
var readingTimeButton = document
.querySelector("#reading-time-calculate")
readingTimeButton.onclick = .object(JSClosure { _ in
let element = document
.querySelector("#reading-time-content")
let text = element.value.string
print(ReadingTime.calculate(for: text ?? ""))
})
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Let’s write some code!
import JavaScriptKit
import ReadingTime
let document = JSObject.global.document
var readingTimeButton = document
.querySelector("#reading-time-calculate")
readingTimeButton.onclick = .object(JSClosure { _ in
let element = document
.querySelector("#reading-time-content")
let text = element.value.string
print(ReadingTime.calculate(for: text ?? ""))
return .null
})
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Bundling… 📦
carton bundle --product ReadingTimeWasm
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JavascriptKit code
Binary
Glue code
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No content
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What we’ve built using Swift
⚙ A simple script for macOS
🍎 A library for all Apple platforms
💻 A command line tool for macOS,
Windows and Linux
🔗 An API using AWS lambdas
🛝 An online playground using Vapor + Plot
📦 A wasm binary which can run on the
web and anywhere that supports Web
Assembly
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A quick shoutout before I go!
https://github.com/joshdholtz/DeckUI
Slide 126
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polpiella.dev
@polpielladev
Say hi! 👋
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