base

Documentation

Index

• func NewClientFacade(caller APICallCloser, facadeName string) (ClientFacade, FacadeCaller)
• type APICallCloser
• type APICaller
• type ClientFacade
• type FacadeCaller
  • func NewFacadeCaller(caller APICaller, facadeName string) FacadeCaller
  • func NewFacadeCallerForVersion(caller APICaller, facadeName string, version int) FacadeCaller
• type UserEnvironment

Functions

func NewClientFacade

func NewClientFacade(caller APICallCloser, facadeName string) (ClientFacade, FacadeCaller)

NewClientFacade prepares a client-facing facade for work against the API. It is expected that most client-facing facades will embed a ClientFacade and will use a FacadeCaller so this function returns both.

Types

type APICallCloser

type APICallCloser interface {
	APICaller

	// Close is used when we have finished with this connection.
	Close() error
}

APICallCloser is the same as APICaller, but also provides a Close() method for when we are done with this connection.

type APICaller

type APICaller interface {
	// APICall makes a call to the API server with the given object type,
	// id, request and parameters. The response is filled in with the
	// call's result if the call is successful.
	APICall(objType string, version int, id, request string, params, response interface{}) error

	// BestFacadeVersion returns the newest version of 'objType' that this
	// client can use with the current API server.
	BestFacadeVersion(facade string) int

	// EnvironTag returns the tag of the environment the client is
	// connected to.
	EnvironTag() (names.EnvironTag, error)
}

APICaller is implemented by the client-facing State object.

type ClientFacade

type ClientFacade interface {
	// BestAPIVersion returns the API version that we were able to
	// determine is supported by both the client and the API Server
	BestAPIVersion() int

	// Close the connection to the API server.
	Close() error
}

ClientFacade should be embedded by client-side facades that are intended as "client" (aka user facing) facades versus agent facing facades. They provide two common methods for writing the client side code. BestAPIVersion() is used to allow for compatibility testing, and Close() is used to indicate when we are done with the connection.

type FacadeCaller

type FacadeCaller interface {
	// FacadeCall will place a request against the API using the requested
	// Facade and the best version that the API server supports that is
	// also known to the client.
	FacadeCall(request string, params, response interface{}) error

	// Name returns the facade name.
	Name() string

	// BestAPIVersion returns the API version that we were able to
	// determine is supported by both the client and the API Server
	BestAPIVersion() int

	// RawAPICaller returns the wrapped APICaller. This can be used if you need
	// to switch what Facade you are calling (such as Facades that return
	// Watchers and then need to use the Watcher facade)
	RawAPICaller() APICaller
}

FacadeCaller is a wrapper for the common paradigm that a given client just wants to make calls on a facade using the best known version of the API. And without dealing with an id parameter.

func NewFacadeCaller

func NewFacadeCaller(caller APICaller, facadeName string) FacadeCaller

NewFacadeCaller wraps an APICaller for a given facade name and the best available version.

func NewFacadeCallerForVersion

func NewFacadeCallerForVersion(caller APICaller, facadeName string, version int) FacadeCaller

NewFacadeCallerForVersion wraps an APICaller for a given facade name and version.

type UserEnvironment

type UserEnvironment struct {
	Name           string
	UUID           string
	Owner          string
	LastConnection *time.Time
}

UserEnvironment holds information about an environment and the last time the environment was accessed for a particular user. This is a client side structure that translates the owner tag into a user facing string.