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68 lines
2.5 KiB
Go
68 lines
2.5 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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Provider structs represent the service providers that offer and manage a
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collection of services. Examples of providers include: OpenStack, Rackspace,
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HP. These are defined like so:
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opts := gophercloud.AuthOptions{
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IdentityEndpoint: "https://my-openstack.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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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 := openstack.NewComputeV2(provider, opts)
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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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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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