111 lines
4.0 KiB
Go
111 lines
4.0 KiB
Go
/*
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Package gophercloud provides a multi-vendor interface to OpenStack-compatible
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clouds. The library has a three-level hierarchy: providers, services, and
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resources.
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Authenticating with Providers
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Provider structs represent the cloud providers that offer and manage a
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collection of services. You will generally want to create one Provider
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client per OpenStack cloud.
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It is now recommended to use the `clientconfig` package found at
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https://github.com/gophercloud/utils/tree/master/openstack/clientconfig
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for all authentication purposes.
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The below documentation is still relevant. clientconfig simply implements
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the below and presents it in an easier and more flexible way.
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Use your OpenStack credentials to create a Provider client. The
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IdentityEndpoint is typically refered to as "auth_url" or "OS_AUTH_URL" in
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information provided by the cloud operator. Additionally, the cloud may refer to
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TenantID or TenantName as project_id and project_name. Credentials are
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specified like so:
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opts := gophercloud.AuthOptions{
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IdentityEndpoint: "https://openstack.example.com:5000/v2.0",
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Username: "{username}",
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Password: "{password}",
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TenantID: "{tenant_id}",
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}
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provider, err := openstack.AuthenticatedClient(opts)
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You can authenticate with a token by doing:
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opts := gophercloud.AuthOptions{
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IdentityEndpoint: "https://openstack.example.com:5000/v2.0",
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TokenID: "{token_id}",
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TenantID: "{tenant_id}",
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}
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provider, err := openstack.AuthenticatedClient(opts)
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You may also use the openstack.AuthOptionsFromEnv() helper function. This
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function reads in standard environment variables frequently found in an
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OpenStack `openrc` file. Again note that Gophercloud currently uses "tenant"
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instead of "project".
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opts, err := openstack.AuthOptionsFromEnv()
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provider, err := openstack.AuthenticatedClient(opts)
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Service Clients
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Service structs are specific to a provider and handle all of the logic and
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operations for a particular OpenStack service. Examples of services include:
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Compute, Object Storage, Block Storage. In order to define one, you need to
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pass in the parent provider, like so:
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opts := gophercloud.EndpointOpts{Region: "RegionOne"}
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client, err := openstack.NewComputeV2(provider, opts)
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Resources
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Resource structs are the domain models that services make use of in order
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to work with and represent the state of API resources:
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server, err := servers.Get(client, "{serverId}").Extract()
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Intermediate Result structs are returned for API operations, which allow
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generic access to the HTTP headers, response body, and any errors associated
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with the network transaction. To turn a result into a usable resource struct,
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you must call the Extract method which is chained to the response, or an
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Extract function from an applicable extension:
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result := servers.Get(client, "{serverId}")
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// Attempt to extract the disk configuration from the OS-DCF disk config
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// extension:
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config, err := diskconfig.ExtractGet(result)
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All requests that enumerate a collection return a Pager struct that is used to
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iterate through the results one page at a time. Use the EachPage method on that
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Pager to handle each successive Page in a closure, then use the appropriate
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extraction method from that request's package to interpret that Page as a slice
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of results:
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err := servers.List(client, nil).EachPage(func (page pagination.Page) (bool, error) {
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s, err := servers.ExtractServers(page)
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if err != nil {
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return false, err
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}
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// Handle the []servers.Server slice.
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// Return "false" or an error to prematurely stop fetching new pages.
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return true, nil
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})
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If you want to obtain the entire collection of pages without doing any
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intermediary processing on each page, you can use the AllPages method:
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allPages, err := servers.List(client, nil).AllPages()
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allServers, err := servers.ExtractServers(allPages)
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This top-level package contains utility functions and data types that are used
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throughout the provider and service packages. Of particular note for end users
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are the AuthOptions and EndpointOpts structs.
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*/
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package gophercloud
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