Golang client for VBR REST API

veeam-vbr-sdk-go is the unofficial Veeam Backup & Replication SDK for the Go programming language. Client generation is based on https://github.com/oapi-codegen/oapi-codegen generator. Due to specific of Golang, we had to make some changes in the original specification to make it work with the generator. You can find changes description in the Specification section.

📁 Project layout

• spec - contains specification files. Both original VBR REST API specification and generated openapi_spec.yaml are placed here.
• tools - contains additional tools. Currently, it contains only oapifixer tool which is used to apply required changes to the original specification.
• pkg/client - contains generated client. It is not recommended to change anything in this directory. If you want to change something, please, change the specification and regenerate the client.

🔍 Specification

openapi_spec.yaml does not contain the whole original VBR REST API specification. We made several changes described below.

Changes in spec

For each schema which has both OneOf and Properties following changes were made:

• Properties were moved to separate schema with the same name as original schema but with Base prefix, e.g. RepositoryModel -> BaseRepositoryModel.
• AllOf was added to the original schema. It contains reference to the Base schema and OneOf from the original schema.
• All references to the original schema were replaced by reference to the Base schema.

How to regenerate spec

Additional tool named oapifixer included in the project. You can find it in the tools/oapifixer directory. It applies all the changes described in the Changes in spec section. Tool integrated into the Makefile and can be used by the following command:

make convert

It will generate specification file which can be used to generate client. By default it expects that the original specification is placed in the spec directory and has the name swagger.json. 'Fixed' specification will be placed in the spec directory and will have the name openapi_spec.yaml. To change the default behavior you can use the following command:

make convert vbr_spec=<path_to_original_vbr_specification> golang_spec=<path_to_result>

It is possible to convert specification from JSON to YAML and vice versa. Just change the extension of the output files.

📝 How to generate code

To generate code just run the following command:

make generate

It will remove the previous version and generate the new one. The result of generation will be placed into the pkg/client directory. The default value for specification is ./spec/openapi_spec.yaml. To change it use the following command:

make generate golang_spec=<path_to_specification>

📗 Documentation

Complete examples

You can find complete examples in the pkg/client directory, in the example_test.go file. Examples made as a Testable Examples.

Create client and authenticate

Create a new client via vbrapi.NewClient()

serverHost := "https://127.0.0.1:9398"
vbrClient := vbrclient.NewClientWithResponses(serverHost)

You can also provide your own http.Client to the constructor:

tlsClient := &http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{
				InsecureSkipVerify: true,
			},
		},
	}
serverHost := "https://127.0.0.1:9398"
cl := vbrclient.NewClientWithResponses(serverHost, vbrclient.WithHTTPClient(tlsClient))

As a result you will get client which can make requests allowed to be made without authentication. For example, you can get server info:

rsi, err := cl.GetServerInfoWithResponse(context.Background(), &vbrclient.GetServerInfoParams{
		XApiVersion: "1.1-rev0",
	})
if err != nil {
	panic(err)
}
log.Print(rsi.JSON200)

To be able to make authenticated requests you have to authenticate your client. Client uses bearer token authentication. So first of all you have to get the token:

user := "vbruser"
password := "vbrpassword"

rl, err := cl.CreateTokenWithFormdataBodyWithResponse(context.Background(), &vbrclient.CreateTokenParams{
		XApiVersion: "1.1-rev0",
	}, vbrclient.CreateTokenFormdataRequestBody{
		GrantType: "password",
		Username:  &user,
		Password:  &pass,
	})
if err != nil {
	panic(err)
}

Next, you need to create a new client with the bearer token provider:

bearerTokenProvider, bearerTokenProviderErr := securityprovider.NewSecurityProviderBearerToken(rl.JSON200.AccessToken)
if bearerTokenProviderErr != nil {
	panic(bearerTokenProviderErr)
}

serverHost := "https://127.0.0.1:9398"
authcl, err := vbrclient.NewClientWithResponses(serverHost, vbrclient.WithRequestEditorFn(bearerTokenProvider.Intercept))
if err != nil {
	panic(err)
}

Now you can make authenticated requests:

nameFilter := "test"
rgr, err := authcl.GetAllRepositoriesWithResponse(context.Background(), &vbrclient.GetAllRepositoriesParams{
		XApiVersion: "1.1-rev0",
		NameFilter:  &nameFilter,
	})
if err != nil {
	panic(err)
}
for rmi := range rgr.JSON200.Data {
	rm := rgr.JSON200.Data[rmi]
	log.Info(rm)
}

Making requests

There are 2 types of Client interfaces provided by the library

• Client which returns unparsed *http.Response
• Client which returns parsed model

So, if you're using client with parsed models you will have 2 functions for each path item. For example:

GetServerInfo(ctx context.Context, params *GetServerInfoParams, reqEditors ...RequestEditorFn) (*http.Response, error)
GetServerInfoWithResponse(ctx context.Context, params *GetServerInfoParams, reqEditors ...RequestEditorFn) (*GetServerInfoResponse, error)

GetServerInfoResponse contains parsed model:

type GetServerInfoResponse struct {
	Body         []byte
	HTTPResponse *http.Response
	JSON200      *ServerInfoModel
	JSON401      *Error
	JSON403      *Error
	JSON500      *Error
}

As you can see there are several objects represents results for different HTTP codes.

Additionally, each response contains following functions to get HTTP Status and HTTP Code

// Status returns HTTPResponse.Status
func (r GetServerInfoResponse) Status() string {
	if r.HTTPResponse != nil {
		return r.HTTPResponse.Status
	}
	return http.StatusText(0)
}

// StatusCode returns HTTPResponse.StatusCode
func (r GetServerInfoResponse) StatusCode() int {
	if r.HTTPResponse != nil {
		return r.HTTPResponse.StatusCode
	}
	return 0
}

Please note that you should check status separately, the error will be returned only in case of failed request. If server returned an answer, no error will be returned.

🚦 Known Issues

• If you convert specification from JSON to YAML usiang oapifixer tool the order of sections in the specification will be changed(to alphabetical). It is not a problem for the generator but it makes it difficult to review changes in the specification.

✍ Contributions

We welcome contributions from the community! We encourage you to create issues for Bugs & Feature Requests and submit Pull Requests. For more detailed information, refer to our Contributing Guide.

🤝🏾 License

• MIT License

🤔 Questions

If you have any questions or something is unclear, please don't hesitate to create an issue and let us know!