133 lines
3.5 KiB
Go
133 lines
3.5 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package dbus
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import (
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godbus "github.com/godbus/dbus"
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)
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// Interface is an interface that presents a subset of the godbus/dbus API. Use this
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// when you want to inject fakeable/mockable D-Bus behavior.
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type Interface interface {
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// SystemBus returns a connection to the system bus, connecting to it
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// first if necessary
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SystemBus() (Connection, error)
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// SessionBus returns a connection to the session bus, connecting to it
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// first if necessary
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SessionBus() (Connection, error)
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}
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// Connection represents a D-Bus connection
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type Connection interface {
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// Returns an Object representing the bus itself
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BusObject() Object
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// Object creates a representation of a remote D-Bus object
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Object(name, path string) Object
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// Signal registers or unregisters a channel to receive D-Bus signals
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Signal(ch chan<- *godbus.Signal)
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}
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// Object represents a remote D-Bus object
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type Object interface {
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// Call synchronously calls a D-Bus method
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Call(method string, flags godbus.Flags, args ...interface{}) Call
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}
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// Call represents a pending or completed D-Bus method call
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type Call interface {
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// Store returns a completed call's return values, or an error
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Store(retvalues ...interface{}) error
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}
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// Implements Interface in terms of actually talking to D-Bus
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type dbusImpl struct {
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systemBus *connImpl
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sessionBus *connImpl
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}
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// Implements Connection as a godbus.Conn
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type connImpl struct {
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conn *godbus.Conn
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}
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// Implements Object as a godbus.Object
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type objectImpl struct {
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object godbus.BusObject
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}
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// Implements Call as a godbus.Call
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type callImpl struct {
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call *godbus.Call
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}
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// New returns a new Interface which will use godbus to talk to D-Bus
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func New() Interface {
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return &dbusImpl{}
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}
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// SystemBus is part of Interface
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func (db *dbusImpl) SystemBus() (Connection, error) {
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if db.systemBus == nil {
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bus, err := godbus.SystemBus()
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if err != nil {
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return nil, err
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}
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db.systemBus = &connImpl{bus}
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}
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return db.systemBus, nil
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}
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// SessionBus is part of Interface
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func (db *dbusImpl) SessionBus() (Connection, error) {
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if db.sessionBus == nil {
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bus, err := godbus.SessionBus()
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if err != nil {
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return nil, err
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}
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db.sessionBus = &connImpl{bus}
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}
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return db.sessionBus, nil
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}
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// BusObject is part of the Connection interface
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func (conn *connImpl) BusObject() Object {
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return &objectImpl{conn.conn.BusObject()}
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}
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// Object is part of the Connection interface
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func (conn *connImpl) Object(name, path string) Object {
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return &objectImpl{conn.conn.Object(name, godbus.ObjectPath(path))}
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}
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// Signal is part of the Connection interface
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func (conn *connImpl) Signal(ch chan<- *godbus.Signal) {
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conn.conn.Signal(ch)
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}
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// Call is part of the Object interface
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func (obj *objectImpl) Call(method string, flags godbus.Flags, args ...interface{}) Call {
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return &callImpl{obj.object.Call(method, flags, args...)}
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}
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// Store is part of the Call interface
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func (call *callImpl) Store(retvalues ...interface{}) error {
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return call.call.Store(retvalues...)
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}
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