Lucio Grenzi - Building serverless applications on the Apache OpenWhisk platform - Codemotion Milan 2017
Download as ODP, PDF0 likes453 views
The document discusses the basics of serverless computing, specifically focusing on the Apache OpenWhisk platform, which allows developers to execute code in response to events without managing infrastructure. It covers the advantages and disadvantages of serverless architecture, along with deployment models, configurations, and practical usage examples for creating actions, triggers, and rules. Additionally, it provides resources and links for further exploration of OpenWhisk and serverless technologies.
![Rest APIs
https://{APIHOST}/api/v1/namespaces/{namespace}
https://{APIHOST}/api/v1/namespaces/{namespace}/actions/[{packageName}/]{actionName}
https://{APIHOST}/api/v1/namespaces/{namespace}/triggers/{triggerName}
https://{APIHOST}/api/v1/namespaces/{namespace}/rules/{ruleName}
https://{APIHOST}/api/v1/namespaces/{namespace}/packages/{packageName}
https://{APIHOST}/api/v1/namespaces/{namespace}/activations/{activationName}
All the capabilities in the system are available through a REST API
All APIs are protected with HTTP Basic authentication](https://image.slidesharecdn.com/7qjzwhgttacwdqrudens-signature-06e279a863e0b1269a4f314c85a14a140d65e2eea4e32917ba3db5d34b8b5447-poli-171117102949/85/Lucio-Grenzi-Building-serverless-applications-on-the-Apache-OpenWhisk-platform-Codemotion-Milan-2017-23-320.jpg)
Lucio Grenzi - Building serverless applications on the Apache OpenWhisk platform - Codemotion Milan 2017
- 1. Building serverless application on the Apache Openwhisk platform Lucio Grenzi CODEMOTION MILAN - SPECIAL EDITION 10 – 11 NOVEMBER 2017
- 2. Who am I? ● Developer, consultant, speaker [email protected] dogwolf lucio.grenzi
- 3. Agenda ● What is servless computing? ● Introduction to Apache OpenWhisk ● Deployment models
- 4. Another serverless talk? https://www.flickr.com/photos/vicki_burton/7421502022
- 5. The evolution Bare Metal VMs Containers Functions https://www.flickr.com/photos/nomeacuerdo/3108955591/
- 6. Serverless: the pros ● Simple but usable primitives ● Pay only usage ● Scale with usage ● Built in availability & fault tolerance
- 7. Serverless: the cons ● Latency ● Async ● No way to keep connection open ● Configuration is a challenge ● Rethink of the common practices
- 8. Apache OpenWhisk Apache OpenWhisk is a serverless, open source cloud platform that allows you to execute code in response to events at any scale. OpenWhisk handles the infrastructure and servers so you can focus on building amazing things. - http://openwhisk.incubator.apache.org/about.html -
- 9. Supporters
- 11. The internal flow of processing
- 12. Enable the environment ● Vagrant ● Native: Ubuntu or MacOs ● Commercial support: IBM BlueMix
- 13. Manage the system OpenWhisk offer: ● Command line interface to mangare all the aspect of the system IBM BlueMix offer: ● Graphic editor
- 14. Activate the CLI There are two required properties to configure in order to use the CLI: ● API host (name or IP address) for the OpenWhisk deployment you want to use. ● Authorization key (username and password) which grants you access to the OpenWhisk API. ./bin/wsk property set --apihost <openwhisk_baseurl> ./bin/wsk property set --auth `auth.guest`
- 15. wskadmin Tool to generate a new namespace and authentication, manage application servers as well as the configuration, application deployment, and server runtime operations. It can provide below functions: ● management for users and limitations ● query of db and system log
- 16. Actions ● Actions are stateless code snippets that run on the OpenWhisk ● Can be explicitly invoked, or run in response to an event ● The result of an action are a dictionary of key-value pairs
- 17. Triggers ● Let you specify outside sources as a way to kick off an action ● Can be fired by using a dictionary of key-value pairs ● Can be explicitly fired by a user or by an external event source
- 18. Rules ● Allow actions to react to the events ● Associates one trigger with one action ● Can be explicitly fired by a user or by an external event source
- 19. Show me the code 1/2 /** * main() will be invoked when you Run This Action * @param OpenWhisk actions accept a single parameter, which must be a JSON object. * @return The output of this action, which must be a JSON object. */ const request = require('request-promise'); function main(params) { return request({ url: "http://myhost.mybluemix.net/addtoimc", method: "POST", headers: {"Content-Type": "text/plain"} }).then(response => { if(response.success) { return Promise.resolved({message: "nice"}); } else { return Promise.rejected({error: "it broke"}); } }); }
- 20. Show me the code 2/2 $ wsk trigger create trgexample ok: created trigger trgeample $ wsk action create actexample index.js ok: created action actexample $ wsk rule create rulexample trgexample actexmple ok: created rule rulexample $wsk action invoke actexample--blocking --result main curl -u "yourUserName":"yourPassword" -H "Content-Type: application/json" -X POST https://MyIPAddress/api/v1/namespaces/myaccount/actions/actexample/main? blocking=true
- 21. Packages ● It's a combination of other actions/triggers/rules that you can link to your own stuff ● Can include actions and feeds. – Actions: a piece of code that runs on OpenWhisk – Feeds: configure external event or fire trigger event
- 22. Browsing packages $ wsk package list /whisk.system packages /whisk.system/cloudant shared /whisk.system/alarms shared /whisk.system/websocket shared /whisk.system/system shared /whisk.system/utils shared /whisk.system/slack shared /whisk.system/samples shared /whisk.system/github shared /whisk.system/pushnotifications $ wsk package get --summary /whisk.system/github
- 23. Rest APIs https://{APIHOST}/api/v1/namespaces/{namespace} https://{APIHOST}/api/v1/namespaces/{namespace}/actions/[{packageName}/]{actionName} https://{APIHOST}/api/v1/namespaces/{namespace}/triggers/{triggerName} https://{APIHOST}/api/v1/namespaces/{namespace}/rules/{ruleName} https://{APIHOST}/api/v1/namespaces/{namespace}/packages/{packageName} https://{APIHOST}/api/v1/namespaces/{namespace}/activations/{activationName} All the capabilities in the system are available through a REST API All APIs are protected with HTTP Basic authentication
- 24. Alarm scheduler $ wsk trigger create periodic --feed /whisk.system/alarms/alarm -p cron '* * * * * *' -p trigger_payload '{"hi":"codemotion"}' ok: invoked /whisk.system/alarms/alarm with id 13fc55adb... ... ok: created trigger feed periodic
- 25. Alarm loop function calculateSchedule() { const now = new Date() const seconds = now.getSeconds() const nextMinute = (now.getMinutes() + 1) % 60 return `${seconds} ${nextMinute} * * * *` } function main(params) { const ow = openwhisk(); const params = {cron: calculateSchedule(), maxTriggers: 1} console.log(params) return ow.feeds.delete({name: '/whisk.system/alarms/alarm', trigger: 'delay'}).then(() => { console.log('delay trigger feed deleted.') return ow.feeds.create({name: '/whisk.system/alarms/alarm', trigger: 'delay', params: params}) }).then(result => { console.log('delay trigger feed created.') }).catch(err => { console.error('failed to create/delete delay trigger', err) console.log("ERROR", err.error.response.result) }) }
- 26. Alarm loop $ wsk action create reschedule reschedule.js ok: created action reschedule Create an action $ wsk trigger create delay --feed /whisk.system/alarms/alarm -p cron '* * * * * *' ok: invoked /whisk.system/alarms/alarm with id b3da4de5726b4... ... ok: created trigger delay Create a trigger $ wsk rule create reschedule_delay delay reschedule ok: created rule reschedule_delay Create a rule that connect the action with the rule
- 27. Develop and deploy ● OpenWhisk – Wrapper around the OpenWhisk API – $ npm install openwhisk ● Serverless – Framework – Provider agnostic – $ npm install serverless -g
- 28. Serverless Openwhisk start ● Nodejs > 6.5.0 ● $ npm install --global serverless serverless-openwhisk ● $ serverless create --template openwhisk-nodejs --path my-path ● $ serverless deploy
- 30. Serverless Openwhisk package ● Nodejs > 6.5.0 ● $ npm install --global serverless serverless-openwhisk ● $ serverless package --package my-package ● $ serverless deploy
- 31. Do practice https://github.com/apache/incubator-openwhisk-workshop Nodejs >= 6 required Installation $ npm install -g openwhisk-workshop Usage $ openwhisk-workshop