Consolidating services with middleware - NDC London 2017
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Have many services? Writing new ones often? If so middleware can help you cut down on the ceremony for writting new services and at same time consolidate the handling of cross cutting concerns. But what is middleware? OWIN and ASP.NET Core both have a concept of middleware. What are they? How do they help? In this talk we will dive into the code, write some middleware and show how middleware helps you handle cross-cutting concerns in an isolated and re-usable way across your services. I'll compare and contrast the OWIN and ASP.NET Core middleware concepts and talk about where each is appropriate.
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Consolidating services with middleware - NDC London 2017
- 1. CONSOLIDATING SERVICES WITH MIDDLEWARE CHRISTIAN HORSDAL HORSDAL CONSULT @CHR_HORSDAL
- 3. STUFF FROM THE REAL WORLD
- 5. WHY MICROSERVICES? • ENABLES CONTINUOUS DELIVERY • HIGHLY MAINTAINABLE SERVICES • EFFICIENT DEVELOPER WORKFLOW • ROBUST BY DESIGN • FLEXIBLE SCALABILITY
- 6. ALL HTTP
- 7. Listing Store Dealer App Partner site Vertical Classifieds site Classifieds site Vertical Listing store Search index Search index ALL HTTP
- 8. WHEN CAN YOU USE MICROSERVICE? AUTOMATED DEPLOYS FAST PROVISIONING AUTOMATED BUILDS AUTOMATED TESTS LOGGING AND MONITORING CLOSE DEV-OPS RELATIONSHIP
- 9. WEB APIS AND MIDDLEWARE
- 10. WEB APIS HANDLE HTTP REQUESTS 12
- 11. ASP.NET CORE: PIPELINE 13 Kestrel Application
- 12. ASP.NET CORE: PIPELINE • USE PIPES AND FILTERS • A CONTEXT IS PIPED THROUGH MIDDLEWARE 14
- 14. MIDDLEWARE • MIDDLEWARE TRANSFORMS THE REQUEST AND RESPONSE • TAKES A CONTEXT IN • CAN CALL NEXT STEP IN PIPELINE • OR NOT • UNIFORM INTERFACE 16
- 15. THINGS YOU MIGHT DO IN THE PIPELINE • OPEN & DISPOSE RESOURCES • LOGGING • AUTHENTICATION • AUTHORIZATION • QUICK MONITORING ENDPOINTS • SANITIZE INPUTS • CONTENT NEGOTIATION • CORS 17
- 16. THINGS YOU MIGHT DO IN THE PIPELINE • OPEN & DISPOSE RESOURCES • LOGGING • AUTHENTICATION • AUTHORIZATION • QUICK MONITORING ENDPOINTS • SANITIZE INPUTS • CONTENT NEGOTIATION • CORS 18 Cross-cutting concerns Re-use Test separately Update separately Distribute separately
- 17. A MICROSERVICE PLATFORM Kestrel Correlation Id Request Logging Performance Logging Monitoring endpoints Authentication Application
- 18. CODE
- 20. ABOUT ME Christian Horsdal Independent Consultant www.horsdal-consult.dk c.horsdal@gmail.com @chr_horsdal