Serverless Swift with Apache OpenWhisk

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SERVERLESS SWIFT WITH OPENWHISK JAMES THOMAS, IBM @THOMASJ

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SERVERS KILL YOUR PRODUCTIVITY @THOMASJ

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WHAT CAN WE DO? @THOMASJ

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Introducing… SERVERLESS PLATFORMS @THOMASJ

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“RUNS CODE IN RESPONSE TO EVENTS, MANAGES COMPUTE RESOURCES” …WHY IS THIS DIFFERENT? @THOMASJ

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FUNCTIONS-AS-A-SERVICE @THOMASJ

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SCALING: 0 to N @THOMASJ

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PAY-AS-YOU-GO ﬂickr photo by a loves dc https://ﬂickr.com/photos/alovesdc/3466740007 CC (BY) license @THOMASJ

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ENOUGH TALKING…  SHOW ME THE CODE. @THOMASJ

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PROVIDERS @THOMASJ

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@THOMASJ

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OPEN SOURCE @THOMASJ

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RUNTIMES @THOMASJ

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} guard let amount = args["amount"] as? Int else { return [ "error": "Missing mandatory argument: amount" ] } guard let prices = currentBitcoinPricesJson() else { return [ "error": "Unable to retrieve Bitcoin prices" ] } guard let rate = prices["bpi"][currency]["rate_float"].double else { return [ "error": "Currency not listed in Bitcoin prices" ] } let converted = Double(amount) / rate let bitcoins = converted.truncate(places: 6) return ["amount": bitcoins, "label": "\(amount) \(currency) is worth \ (bitcoins) bitcoins."] } my_code.swift @THOMASJ

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func main(args: [String:Any]) -> [String:Any] { if let name = args["name"] as? String { return [ "greeting" : "Hello \(name)!" ] } else { return [ "greeting" : "Hello anonymous!" ] } } Entry Point Event Parameters Service Response Swift 3

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struct Person: Codable { let name: String? } struct Message: Codable { let greeting: String } func main(p: Person, callback: (Message?, Error?) -> Void) -> Void { if let name = p.name { callback(Message(greeting: "Hello \(name)"), nil) } else { callback(Message(greeting: "Hello anonymous!"), nil) } } Swift 4 Event Parameters Service Result Callback Response

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ACTIONS @THOMASJ

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Platform API HTTP Request Microservice @THOMASJ

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$ wsk action create —help create a new action Usage: wsk action create ACTION_NAME ACTION [flags] Flags: --web string treat ACTION as a web action  @THOMASJ

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Platform API HTTP Request Microservice @THOMASJ

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WHAT ABOUT… API ROUTING?   RATE LIMITING? AUTHENTICATION? DEPLOYMENTS? @THOMASJ

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Platform API API Gateway Microservice @THOMASJ

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TRIGGERS @THOMASJ

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External Events Trigger @THOMASJ

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EVENT SOURCES @THOMASJ

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Rules Rules @THOMASJ

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CHALLENGES @THOMASJ

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“WARM” vs “COLD” ⛄ @THOMASJ

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$ time wsk action invoke bitcoin -p amount 1000 -p currency USD -r { "amount": 0.246287, "label": "1000.0 USD is worth 0.246287 bitcoins." } real 0m4.638s user 0m0.095s sys 0m0.054s  $ time wsk action invoke bitcoin -p amount 1000 -p currency USD -r { "amount": 0.246287, "label": "1000.0 USD is worth 0.246287 bitcoins." } real 0m1.003s user 0m0.093s sys 0m0.045s @THOMASJ

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$ time wsk action invoke … { "amount": 0.246287, "label": “...” } real 0m4.638s user 0m0.095s sys 0m0.054s ——> start container ——> inject code ——> swift build ——> call main() ——> pause container $ time wsk action invoke … { "amount": 0.246287, "label": “...” } real 0m1.003s user 0m0.093s sys 0m0.045s ——> resume container ——> inject code ——> swift build ——> call main() ——> pause container @THOMASJ

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$ time wsk action invoke … { "amount": 0.246287, "label": “...” } real 0m1.438s user 0m0.095s sys 0m0.054s ——> start container ——> inject code ——> swift build ——> call main() ——> pause container $ time wsk action invoke … { "amount": 0.246287, "label": “...” } real 0m1.003s user 0m0.093s sys 0m0.045s ——> resume container ——> inject code ——> swift build ——> call main() ——> pause container @THOMASJ

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COMPUTE LIMITS ﬂickr photo by zund https://ﬂickr.com/photos/zund/12202485675 CC (BY-NC-ND) license @THOMASJ

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@THOMASJ

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SERVERS KILL YOUR PRODUCTIVITY @THOMASJ

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FIRE YOUR SERVERS + = UPGRADE PRODUCTIVITY @THOMASJ

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http://bit.ly/burn_your_servers slack.openwhisk.org #openwhisk @thomasj or @openwhisk

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QUESTIONS? @THOMASJ