k3s/vendor/github.com/emicklei/go-restful

go-restful

package for building REST-style Web Services using Google Go

• Code examples

REST asks developers to use HTTP methods explicitly and in a way that's consistent with the protocol definition. This basic REST design principle establishes a one-to-one mapping between create, read, update, and delete (CRUD) operations and HTTP methods. According to this mapping:

• GET = Retrieve a representation of a resource
• POST = Create if you are sending content to the server to create a subordinate of the specified resource collection, using some server-side algorithm.
• PUT = Create if you are sending the full content of the specified resource (URI).
• PUT = Update if you are updating the full content of the specified resource.
• DELETE = Delete if you are requesting the server to delete the resource
• PATCH = Update partial content of a resource
• OPTIONS = Get information about the communication options for the request URI

Example

ws := new(restful.WebService)
ws.
	Path("/users").
	Consumes(restful.MIME_XML, restful.MIME_JSON).
	Produces(restful.MIME_JSON, restful.MIME_XML)

ws.Route(ws.GET("/{user-id}").To(u.findUser).
	Doc("get a user").
	Param(ws.PathParameter("user-id", "identifier of the user").DataType("string")).
	Writes(User{}))		
...
	
func (u UserResource) findUser(request *restful.Request, response *restful.Response) {
	id := request.PathParameter("user-id")
	...
}

Full API of a UserResource

Features

• Routes for request → function mapping with path parameter (e.g. {id}) support
• Configurable router:
  • (default) Fast routing algorithm that allows static elements, regular expressions and dynamic parameters in the URL path (e.g. /meetings/{id} or /static/{subpath:*}
  • Routing algorithm after JSR311 that is implemented using (but does not accept) regular expressions
• Request API for reading structs from JSON/XML and accesing parameters (path,query,header)
• Response API for writing structs to JSON/XML and setting headers
• Customizable encoding using EntityReaderWriter registration
• Filters for intercepting the request → response flow on Service or Route level
• Request-scoped variables using attributes
• Containers for WebServices on different HTTP endpoints
• Content encoding (gzip,deflate) of request and response payloads
• Automatic responses on OPTIONS (using a filter)
• Automatic CORS request handling (using a filter)
• API declaration for Swagger UI (go-restful-openapi, see go-restful-swagger12)
• Panic recovery to produce HTTP 500, customizable using RecoverHandler(...)
• Route errors produce HTTP 404/405/406/415 errors, customizable using ServiceErrorHandler(...)
• Configurable (trace) logging
• Customizable gzip/deflate readers and writers using CompressorProvider registration

How to customize

There are several hooks to customize the behavior of the go-restful package.

• Router algorithm
• Panic recovery
• JSON decoder
• Trace logging
• Compression
• Encoders for other serializers
• Use jsoniter by build this package using a tag, e.g. go build -tags=jsoniter .

TODO: write examples of these.

Resources

• Example posted on blog
• Design explained on blog
• sourcegraph
• showcase: Zazkia - tcp proxy for testing resiliency
• showcase: Mora - MongoDB REST Api server

Type git shortlog -s for a full list of contributors.

© 2012 - 2018, http://ernestmicklei.com. MIT License. Contributions are welcome.