GopherTelekomCloud: a OpenTelekomCloud SDK for Golang

GopherTelekomCloud is a OpenTelekomCloud clouds Go SDK. GopherTelekomCloud is based on Gophercloud which is an OpenStack Go SDK and has a great design. GopherTelekomCloud has added and removed some features to support OpenTelekomCloud.

Useful links

• Reference documentation
• Effective Go

How to install

Installation with modern Go and go mod is really simple:

Just run go mod download to install all dependencies.

Getting started

Credentials

Because you'll be hitting an API, you will need to retrieve your OpenTelekomCloud credentials and store them using standard Openstack approaches: either clouds.yaml file (recommended) or environment variables.

You will need to retrieve the following:

• domain name
• username
• password
• project name/id (for most of the services)
• a valid IAM identity URL

Authentication

Once you have access to your credentials, you can begin plugging them into Golangsdk. The next step is authentication, and this is handled by a base "Provider" struct. To get one, you can either pass in your credentials explicitly, or tell Golangsdk to use environment variables:

Option 1: Pass in the values yourself

opts := golangsdk.AuthOptions{
IdentityEndpoint: "https://openstack.example.com:5000/v2.0",
Username:         "{username}",
Password:         "{password}",
}
client, err := openstack.AuthenticatedClient(opts)

Option 2: Use a utility function to retrieve cloud configuration from env variables and configuration files

env := openstack.NewEnv("OS_") // use OS_ prefixed env variables
client, err := env.AuthenticatedClient()

The ProviderClient is the top-level client that all of your OpenTelekomCloud services derive from. The provider contains all of the authentication details that allow your Go code to access the API - such as the base URL and token ID.

Provision a rds instance

Once we have a base Provider, we inject it as a dependency into each OpenTelekomCloud service. In order to work with the rds API, we need a rds service client; which can be created like so:

client, err := openstack.NewRdsServiceV1(provider, golangsdk.EndpointOpts{
	Region: utils.GetRegion(ao),
})

We then use this client for any rds API operation we want. In our case, we want to provision a rds instance - so we invoke the Create method and pass in the name and the flavor ID (database specification) we're interested in:

import "github.com/opentelekomcloud/gophertelekomcloud/openstack/rds/v1/instances"

instance, err := instances.Create(client, instances.CreateOpts{
	Name:      "My new rds instance!",
	FlavorRef: "flavor_id",
}).Extract()

The above code sample creates a new rds instance with the parameters, and embodies the new resource in the instance variable (ainstances.Instance struct).

Advanced Usage

Have a look at the FAQ for some tips on customizing the way Golangsdk works.

Backwards-Compatibility Guarantees

None. Vendor it and write tests covering the parts you use.

Contributing

See the contributing guide.

Help and feedback

If you're struggling with something or have spotted a potential bug, feel free to submit an issue to our bug tracker.