mirror of https://github.com/containers/podman.git
108 lines
3.8 KiB
Go
108 lines
3.8 KiB
Go
package dbus
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// Terminator allows a handler to implement a shutdown mechanism that
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// is called when the connection terminates.
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type Terminator interface {
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Terminate()
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}
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// Handler is the representation of a D-Bus Application.
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//
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// The Handler must have a way to lookup objects given
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// an ObjectPath. The returned object must implement the
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// ServerObject interface.
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type Handler interface {
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LookupObject(path ObjectPath) (ServerObject, bool)
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}
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// ServerObject is the representation of an D-Bus Object.
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//
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// Objects are registered at a path for a given Handler.
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// The Objects implement D-Bus interfaces. The semantics
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// of Interface lookup is up to the implementation of
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// the ServerObject. The ServerObject implementation may
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// choose to implement empty string as a valid interface
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// representing all methods or not per the D-Bus specification.
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type ServerObject interface {
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LookupInterface(name string) (Interface, bool)
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}
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// An Interface is the representation of a D-Bus Interface.
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//
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// Interfaces are a grouping of methods implemented by the Objects.
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// Interfaces are responsible for routing method calls.
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type Interface interface {
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LookupMethod(name string) (Method, bool)
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}
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// A Method represents the exposed methods on D-Bus.
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type Method interface {
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// Call requires that all arguments are decoded before being passed to it.
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Call(args ...interface{}) ([]interface{}, error)
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NumArguments() int
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NumReturns() int
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// ArgumentValue returns a representative value for the argument at position
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// it should be of the proper type. reflect.Zero would be a good mechanism
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// to use for this Value.
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ArgumentValue(position int) interface{}
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// ReturnValue returns a representative value for the return at position
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// it should be of the proper type. reflect.Zero would be a good mechanism
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// to use for this Value.
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ReturnValue(position int) interface{}
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}
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// An Argument Decoder can decode arguments using the non-standard mechanism
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//
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// If a method implements this interface then the non-standard
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// decoder will be used.
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//
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// Method arguments must be decoded from the message.
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// The mechanism for doing this will vary based on the
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// implementation of the method. A normal approach is provided
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// as part of this library, but may be replaced with
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// any other decoding scheme.
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type ArgumentDecoder interface {
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// To decode the arguments of a method the sender and message are
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// provided in case the semantics of the implementer provides access
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// to these as part of the method invocation.
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DecodeArguments(conn *Conn, sender string, msg *Message, args []interface{}) ([]interface{}, error)
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}
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// A SignalHandler is responsible for delivering a signal.
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//
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// Signal delivery may be changed from the default channel
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// based approach by Handlers implementing the SignalHandler
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// interface.
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type SignalHandler interface {
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DeliverSignal(iface, name string, signal *Signal)
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}
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// SignalRegistrar manages signal delivery channels.
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//
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// This is an optional set of methods for `SignalHandler`.
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type SignalRegistrar interface {
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AddSignal(ch chan<- *Signal)
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RemoveSignal(ch chan<- *Signal)
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}
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// A DBusError is used to convert a generic object to a D-Bus error.
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//
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// Any custom error mechanism may implement this interface to provide
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// a custom encoding of the error on D-Bus. By default if a normal
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// error is returned, it will be encoded as the generic
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// "org.freedesktop.DBus.Error.Failed" error. By implementing this
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// interface as well a custom encoding may be provided.
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type DBusError interface {
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DBusError() (string, []interface{})
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}
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// SerialGenerator is responsible for serials generation.
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//
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// Different approaches for the serial generation can be used,
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// maintaining a map guarded with a mutex (the standard way) or
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// simply increment an atomic counter.
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type SerialGenerator interface {
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GetSerial() uint32
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RetireSerial(serial uint32)
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}
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