Webservices ingo
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The document discusses building web services in Go. It covers REST, advantages of Go, building a basic inventory web service using file I/O, testing services, securing services with JWT, and hosting on Heroku. Examples are provided for building handlers, testing APIs, generating and parsing JWT tokens.
Webservices ingo
- 2. Agenda • REST • Go Advantage • Web service example • TesMng • Securing using JWT • HosMng
- 5. REST • Introduced by Roy Fielding, 2000 • REpresentaMonal State Transfer – Use HTTP methods explicitly. • POST, GET, PUT, DELETE – Be stateless. – Expose directory structure-like URIs. • h1p://www.myservice.org/discussion/topics/{topic} – Transfer XML, JSON or both
- 9. Go advantage • Deployment – Single binary – Dependency needs staMc Mme managing • Performance of go – Built-in concurrency • Garbage collecMon
- 10. Basic web service using FileIO • The service handles inventory of IPAddresses • Uses – net/h1p of for handling h1p request • h1p.ListenAndServe() – Handles concurrent requests – gorrilla/mux for parameterized rouMng – os and bufio for file handling • h1ps://github.com/u1amgandhi24/ipalloc
- 12. Adding Handlers
- 15. IPAlloc In AcMon • ipalloc • ipalloc service listening on 8123 …. • curl –XPOST –d ’{“Name”:”dev8”,”IPAddress”:”1.2.3.12”}’ h1p://localhost:8123/ipalloc • curl –G h1p://localhost:8123/ipalloc/1.2.3.12 {“Name”:”device12”,”IPAddress”:”1.2.3.12”}
- 16. TesMng • test and h1ptest • Write tests in _test.go files • func TestMain to write setup and tear-down code • Test case should start with Test prefix • go test runs all tests • go test –cover runs the test and shows coverage
- 17. Test An API
- 18. Securing with JWT.io • Json web tokens – JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transminng informaMon between parMes as a JSON object. • Library support – C, Go, Swip, Scala, .NET, Java, Python, Node.js …... • Structure of JWT – base64 encoded header – base64 encoded payload – signature of the dot separated header and payload. • h1ps://github.com/u1amgandhi24/jwtdemo
- 22. JWT In AcMon • jwtdemo • jwtdemo service listening on 3080 …. • curl –XPOST –H “AuthenMcaMon : U3luZXJ6aXAxOlBhc3N3b3JkMQ==” h1ps://localhost:3080/ authenMcate • "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE0NTU2MTQzOT Z9.pzRgQSRHwSfUymQPsG-LVaH_2n10g3wxpJltYuiUco0" • curl –H “AuthenMcaMon : eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE0NTU2MTQzOTZ 9.pzRgQSRHwSfUymQPsG-LVaH_2n10g3wxpJltYuiUco0” h1p:// localhost:3080/book/page/2 {"PageNum":2, "content":"This a sample page”}
- 25. References • h1p://thenewstack.io/make-a-resxul-json-api-go/ • h1p://www.ibm.com/developerworks/library/ws- resxul/ • h1ps://scotch.io/tutorials/the-ins-and-outs-of-token- based-authenMcaMon • h1p://jwt.io/ • h1p://dghubble.com/blog/posts/json-web-tokens- and-go/ • h1p://www.tutorialized.com/tutorial/RESTful-Web- services:-The-basics/40001
- 26. References • h1ps://golang.org/pkg/encoding/base64/ #example_Encoding_DecodeString • h1p://stackoverflow.com/quesMons/ 1368014/why-do-we-need-resxul-web- services • h1p://di-side.com/di-side/services/web- soluMons/rest-webservice-symfony/ • h1p://spf13.com/post/soap-vs-rest