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gerrit.mcp.mirantis.com / debian / gophercloud / 48584fb6faa14880acfd8e1829a74cf0f968ccd6
commit48584fb6faa14880acfd8e1829a74cf0f968ccd6[log] [tgz]
authorJoe Topjian <joe@topjian.net>Mon Feb 13 21:18:26 2017 -0700
committerjrperritt <jrperritt@gmail.com>Mon Feb 13 22:18:26 2017 -0600
tree2aee564f1da6b52a3844ac126e50244db32f6840
parent10a2744ec7fa9a716a77c186396c5e0a2cc9a4ba [diff]
Refactor WaitFor (#221)

* Refactor WaitFor

This commit modifies WaitFor in a few ways:

It replaces time.Now().Second() with time.Now().Unix() in order to
account for rolling minutes (for example, when WaitFor starts at 59
seconds, every timeout check will result in a negative number).

A "retry" timer has also been added. This will cause the predicate
to be retried every n seconds if there hasn't been a response. This
is to account for server or network issues that would cause the
predicate to be lost or hang indefinitely.

A combination of using both timeout and retry can be effective in
handling faulty requests as well as a master kill switch to stop.

* Remove Retry from WaitFor

This removes the retry parameter and re-uses the timeout to kill
possible hanging predicates.
2 files changed
tree: 2aee564f1da6b52a3844ac126e50244db32f6840
  1. .github/
  2. acceptance/
  3. openstack/
  4. pagination/
  5. script/
  6. testhelper/
  7. testing/
  8. .gitignore
  9. .travis.yml
  10. auth_options.go
  11. CHANGELOG.md
  12. doc.go
  13. endpoint_search.go
  14. errors.go
  15. FAQ.md
  16. LICENSE
  17. MIGRATING.md
  18. params.go
  19. provider_client.go
  20. README.md
  21. results.go
  22. service_client.go
  23. STYLEGUIDE.md
  24. util.go
README.md

Gophercloud: an OpenStack SDK for Go

Build Status Coverage Status

Gophercloud is an OpenStack Go SDK.

Useful links

How to install

Before installing, you need to ensure that your GOPATH environment variable is pointing to an appropriate directory where you want to install Gophercloud:

mkdir $HOME/go
export GOPATH=$HOME/go

To protect yourself against changes in your dependencies, we highly recommend choosing a dependency management solution for your projects, such as godep. Once this is set up, you can install Gophercloud as a dependency like so:

go get github.com/gophercloud/gophercloud

# Edit your code to import relevant packages from "github.com/gophercloud/gophercloud"

godep save ./...

This will install all the source files you need into a Godeps/_workspace directory, which is referenceable from your own source files when you use the godep go command.

Getting started

Credentials

Because you'll be hitting an API, you will need to retrieve your OpenStack credentials and either store them as environment variables or in your local Go files. The first method is recommended because it decouples credential information from source code, allowing you to push the latter to your version control system without any security risk.

You will need to retrieve the following:

  • username
  • password
  • a valid Keystone identity URL

For users that have the OpenStack dashboard installed, there's a shortcut. If you visit the project/access_and_security path in Horizon and click on the "Download OpenStack RC File" button at the top right hand corner, you will download a bash file that exports all of your access details to environment variables. To execute the file, run source admin-openrc.sh and you will be prompted for your password.

Authentication

Once you have access to your credentials, you can begin plugging them into Gophercloud. 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 Gophercloud to use environment variables:

import (
  "github.com/gophercloud/gophercloud"
  "github.com/gophercloud/gophercloud/openstack"
  "github.com/gophercloud/gophercloud/openstack/utils"
)

// Option 1: Pass in the values yourself
opts := gophercloud.AuthOptions{
  IdentityEndpoint: "https://my-openstack.com:5000/v2.0",
  Username: "{username}",
  Password: "{password}",
}

// Option 2: Use a utility function to retrieve all your environment variables
opts, err := openstack.AuthOptionsFromEnv()

Once you have the opts variable, you can pass it in and get back a ProviderClient struct:

provider, err := openstack.AuthenticatedClient(opts)

The ProviderClient is the top-level client that all of your OpenStack 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 server

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

client, err := openstack.NewComputeV2(provider, gophercloud.EndpointOpts{
  Region: os.Getenv("OS_REGION_NAME"),
})

We then use this client for any Compute API operation we want. In our case, we want to provision a new server - so we invoke the Create method and pass in the flavor ID (hardware specification) and image ID (operating system) we're interested in:

import "github.com/gophercloud/gophercloud/openstack/compute/v2/servers"

server, err := servers.Create(client, servers.CreateOpts{
  Name:      "My new server!",
  FlavorRef: "flavor_id",
  ImageRef:  "image_id",
}).Extract()

The above code sample creates a new server with the parameters, and embodies the new resource in the server variable (a servers.Server struct).

Advanced Usage

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