Update dependencies to include github.com/godbus/dbus
Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
This commit is contained in:
Mrunal Patel
parent
3a9e7036a1
commit
69ed8639cd
73 changed files with 7291 additions and 31 deletions
634
vendor/github.com/godbus/dbus/conn.go
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vendored
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634
vendor/github.com/godbus/dbus/conn.go
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package dbus
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import (
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"errors"
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"io"
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"os"
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"reflect"
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"strings"
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"sync"
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)
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const defaultSystemBusAddress = "unix:path=/var/run/dbus/system_bus_socket"
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var (
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systemBus *Conn
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systemBusLck sync.Mutex
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sessionBus *Conn
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sessionBusLck sync.Mutex
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sessionEnvLck sync.Mutex
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)
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// ErrClosed is the error returned by calls on a closed connection.
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var ErrClosed = errors.New("dbus: connection closed by user")
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// Conn represents a connection to a message bus (usually, the system or
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// session bus).
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//
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// Connections are either shared or private. Shared connections
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// are shared between calls to the functions that return them. As a result,
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// the methods Close, Auth and Hello must not be called on them.
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//
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// Multiple goroutines may invoke methods on a connection simultaneously.
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type Conn struct {
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transport
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busObj BusObject
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unixFD bool
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uuid string
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names []string
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namesLck sync.RWMutex
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serialLck sync.Mutex
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nextSerial uint32
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serialUsed map[uint32]bool
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calls map[uint32]*Call
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callsLck sync.RWMutex
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handlers map[ObjectPath]map[string]exportedObj
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handlersLck sync.RWMutex
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out chan *Message
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closed bool
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outLck sync.RWMutex
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signals []chan<- *Signal
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signalsLck sync.Mutex
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eavesdropped chan<- *Message
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eavesdroppedLck sync.Mutex
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}
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// SessionBus returns a shared connection to the session bus, connecting to it
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// if not already done.
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func SessionBus() (conn *Conn, err error) {
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sessionBusLck.Lock()
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defer sessionBusLck.Unlock()
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if sessionBus != nil {
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return sessionBus, nil
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}
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defer func() {
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if conn != nil {
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sessionBus = conn
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}
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}()
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conn, err = SessionBusPrivate()
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if err != nil {
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return
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}
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if err = conn.Auth(nil); err != nil {
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conn.Close()
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conn = nil
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return
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}
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if err = conn.Hello(); err != nil {
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conn.Close()
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conn = nil
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}
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return
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}
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// SessionBusPrivate returns a new private connection to the session bus.
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func SessionBusPrivate() (*Conn, error) {
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sessionEnvLck.Lock()
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defer sessionEnvLck.Unlock()
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address := os.Getenv("DBUS_SESSION_BUS_ADDRESS")
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if address != "" && address != "autolaunch:" {
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return Dial(address)
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}
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return sessionBusPlatform()
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}
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// SystemBus returns a shared connection to the system bus, connecting to it if
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// not already done.
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func SystemBus() (conn *Conn, err error) {
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systemBusLck.Lock()
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defer systemBusLck.Unlock()
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if systemBus != nil {
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return systemBus, nil
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}
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defer func() {
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if conn != nil {
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systemBus = conn
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}
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}()
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conn, err = SystemBusPrivate()
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if err != nil {
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return
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}
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if err = conn.Auth(nil); err != nil {
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conn.Close()
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conn = nil
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return
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}
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if err = conn.Hello(); err != nil {
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conn.Close()
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conn = nil
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}
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return
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}
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// SystemBusPrivate returns a new private connection to the system bus.
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func SystemBusPrivate() (*Conn, error) {
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address := os.Getenv("DBUS_SYSTEM_BUS_ADDRESS")
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if address != "" {
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return Dial(address)
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}
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return Dial(defaultSystemBusAddress)
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}
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// Dial establishes a new private connection to the message bus specified by address.
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func Dial(address string) (*Conn, error) {
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tr, err := getTransport(address)
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if err != nil {
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return nil, err
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}
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return newConn(tr)
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}
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// NewConn creates a new private *Conn from an already established connection.
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func NewConn(conn io.ReadWriteCloser) (*Conn, error) {
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return newConn(genericTransport{conn})
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}
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// newConn creates a new *Conn from a transport.
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func newConn(tr transport) (*Conn, error) {
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conn := new(Conn)
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conn.transport = tr
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conn.calls = make(map[uint32]*Call)
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conn.out = make(chan *Message, 10)
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conn.handlers = make(map[ObjectPath]map[string]exportedObj)
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conn.nextSerial = 1
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conn.serialUsed = map[uint32]bool{0: true}
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conn.busObj = conn.Object("org.freedesktop.DBus", "/org/freedesktop/DBus")
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return conn, nil
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}
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// BusObject returns the object owned by the bus daemon which handles
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// administrative requests.
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func (conn *Conn) BusObject() BusObject {
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return conn.busObj
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}
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// Close closes the connection. Any blocked operations will return with errors
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// and the channels passed to Eavesdrop and Signal are closed. This method must
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// not be called on shared connections.
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func (conn *Conn) Close() error {
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conn.outLck.Lock()
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if conn.closed {
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// inWorker calls Close on read error, the read error may
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// be caused by another caller calling Close to shutdown the
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// dbus connection, a double-close scenario we prevent here.
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conn.outLck.Unlock()
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return nil
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}
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close(conn.out)
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conn.closed = true
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conn.outLck.Unlock()
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conn.signalsLck.Lock()
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for _, ch := range conn.signals {
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close(ch)
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}
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conn.signalsLck.Unlock()
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conn.eavesdroppedLck.Lock()
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if conn.eavesdropped != nil {
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close(conn.eavesdropped)
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}
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conn.eavesdroppedLck.Unlock()
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return conn.transport.Close()
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}
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// Eavesdrop causes conn to send all incoming messages to the given channel
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// without further processing. Method replies, errors and signals will not be
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// sent to the appropiate channels and method calls will not be handled. If nil
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// is passed, the normal behaviour is restored.
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//
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// The caller has to make sure that ch is sufficiently buffered;
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// if a message arrives when a write to ch is not possible, the message is
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// discarded.
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func (conn *Conn) Eavesdrop(ch chan<- *Message) {
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conn.eavesdroppedLck.Lock()
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conn.eavesdropped = ch
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conn.eavesdroppedLck.Unlock()
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}
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// getSerial returns an unused serial.
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func (conn *Conn) getSerial() uint32 {
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conn.serialLck.Lock()
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defer conn.serialLck.Unlock()
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n := conn.nextSerial
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for conn.serialUsed[n] {
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n++
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}
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conn.serialUsed[n] = true
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conn.nextSerial = n + 1
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return n
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}
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// Hello sends the initial org.freedesktop.DBus.Hello call. This method must be
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// called after authentication, but before sending any other messages to the
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// bus. Hello must not be called for shared connections.
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func (conn *Conn) Hello() error {
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var s string
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err := conn.busObj.Call("org.freedesktop.DBus.Hello", 0).Store(&s)
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if err != nil {
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return err
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}
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conn.namesLck.Lock()
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conn.names = make([]string, 1)
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conn.names[0] = s
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conn.namesLck.Unlock()
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return nil
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}
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// inWorker runs in an own goroutine, reading incoming messages from the
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// transport and dispatching them appropiately.
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func (conn *Conn) inWorker() {
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for {
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msg, err := conn.ReadMessage()
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if err == nil {
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conn.eavesdroppedLck.Lock()
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if conn.eavesdropped != nil {
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select {
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case conn.eavesdropped <- msg:
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default:
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}
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conn.eavesdroppedLck.Unlock()
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continue
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}
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conn.eavesdroppedLck.Unlock()
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dest, _ := msg.Headers[FieldDestination].value.(string)
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found := false
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if dest == "" {
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found = true
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} else {
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conn.namesLck.RLock()
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if len(conn.names) == 0 {
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found = true
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}
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for _, v := range conn.names {
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if dest == v {
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found = true
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break
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}
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}
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conn.namesLck.RUnlock()
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}
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if !found {
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// Eavesdropped a message, but no channel for it is registered.
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// Ignore it.
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continue
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}
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switch msg.Type {
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case TypeMethodReply, TypeError:
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serial := msg.Headers[FieldReplySerial].value.(uint32)
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conn.callsLck.Lock()
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if c, ok := conn.calls[serial]; ok {
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if msg.Type == TypeError {
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name, _ := msg.Headers[FieldErrorName].value.(string)
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c.Err = Error{name, msg.Body}
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} else {
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c.Body = msg.Body
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}
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c.Done <- c
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conn.serialLck.Lock()
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delete(conn.serialUsed, serial)
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conn.serialLck.Unlock()
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delete(conn.calls, serial)
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}
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conn.callsLck.Unlock()
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case TypeSignal:
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iface := msg.Headers[FieldInterface].value.(string)
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member := msg.Headers[FieldMember].value.(string)
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// as per http://dbus.freedesktop.org/doc/dbus-specification.html ,
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// sender is optional for signals.
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sender, _ := msg.Headers[FieldSender].value.(string)
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if iface == "org.freedesktop.DBus" && sender == "org.freedesktop.DBus" {
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if member == "NameLost" {
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// If we lost the name on the bus, remove it from our
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// tracking list.
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name, ok := msg.Body[0].(string)
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if !ok {
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panic("Unable to read the lost name")
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}
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conn.namesLck.Lock()
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for i, v := range conn.names {
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if v == name {
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conn.names = append(conn.names[:i],
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conn.names[i+1:]...)
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}
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}
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conn.namesLck.Unlock()
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} else if member == "NameAcquired" {
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// If we acquired the name on the bus, add it to our
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// tracking list.
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name, ok := msg.Body[0].(string)
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if !ok {
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panic("Unable to read the acquired name")
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}
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conn.namesLck.Lock()
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conn.names = append(conn.names, name)
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conn.namesLck.Unlock()
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}
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}
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signal := &Signal{
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Sender: sender,
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Path: msg.Headers[FieldPath].value.(ObjectPath),
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Name: iface + "." + member,
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Body: msg.Body,
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}
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conn.signalsLck.Lock()
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for _, ch := range conn.signals {
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ch <- signal
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}
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conn.signalsLck.Unlock()
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case TypeMethodCall:
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go conn.handleCall(msg)
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}
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} else if _, ok := err.(InvalidMessageError); !ok {
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// Some read error occured (usually EOF); we can't really do
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// anything but to shut down all stuff and returns errors to all
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// pending replies.
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conn.Close()
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conn.callsLck.RLock()
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for _, v := range conn.calls {
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v.Err = err
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v.Done <- v
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}
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conn.callsLck.RUnlock()
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return
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}
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// invalid messages are ignored
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}
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}
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// Names returns the list of all names that are currently owned by this
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// connection. The slice is always at least one element long, the first element
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// being the unique name of the connection.
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func (conn *Conn) Names() []string {
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conn.namesLck.RLock()
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// copy the slice so it can't be modified
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s := make([]string, len(conn.names))
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copy(s, conn.names)
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conn.namesLck.RUnlock()
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return s
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}
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// Object returns the object identified by the given destination name and path.
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func (conn *Conn) Object(dest string, path ObjectPath) BusObject {
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return &Object{conn, dest, path}
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}
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// outWorker runs in an own goroutine, encoding and sending messages that are
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// sent to conn.out.
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func (conn *Conn) outWorker() {
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for msg := range conn.out {
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err := conn.SendMessage(msg)
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conn.callsLck.RLock()
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if err != nil {
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if c := conn.calls[msg.serial]; c != nil {
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c.Err = err
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c.Done <- c
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}
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conn.serialLck.Lock()
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delete(conn.serialUsed, msg.serial)
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conn.serialLck.Unlock()
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} else if msg.Type != TypeMethodCall {
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conn.serialLck.Lock()
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delete(conn.serialUsed, msg.serial)
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conn.serialLck.Unlock()
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}
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conn.callsLck.RUnlock()
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}
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}
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// Send sends the given message to the message bus. You usually don't need to
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// use this; use the higher-level equivalents (Call / Go, Emit and Export)
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// instead. If msg is a method call and NoReplyExpected is not set, a non-nil
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// call is returned and the same value is sent to ch (which must be buffered)
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// once the call is complete. Otherwise, ch is ignored and a Call structure is
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// returned of which only the Err member is valid.
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func (conn *Conn) Send(msg *Message, ch chan *Call) *Call {
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var call *Call
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msg.serial = conn.getSerial()
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if msg.Type == TypeMethodCall && msg.Flags&FlagNoReplyExpected == 0 {
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if ch == nil {
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ch = make(chan *Call, 5)
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} else if cap(ch) == 0 {
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panic("dbus: unbuffered channel passed to (*Conn).Send")
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}
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call = new(Call)
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call.Destination, _ = msg.Headers[FieldDestination].value.(string)
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call.Path, _ = msg.Headers[FieldPath].value.(ObjectPath)
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iface, _ := msg.Headers[FieldInterface].value.(string)
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member, _ := msg.Headers[FieldMember].value.(string)
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call.Method = iface + "." + member
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call.Args = msg.Body
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call.Done = ch
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conn.callsLck.Lock()
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conn.calls[msg.serial] = call
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conn.callsLck.Unlock()
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conn.outLck.RLock()
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if conn.closed {
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call.Err = ErrClosed
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call.Done <- call
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} else {
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conn.out <- msg
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}
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conn.outLck.RUnlock()
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} else {
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conn.outLck.RLock()
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if conn.closed {
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call = &Call{Err: ErrClosed}
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} else {
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conn.out <- msg
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call = &Call{Err: nil}
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}
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conn.outLck.RUnlock()
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}
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return call
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}
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// sendError creates an error message corresponding to the parameters and sends
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// it to conn.out.
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func (conn *Conn) sendError(e Error, dest string, serial uint32) {
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msg := new(Message)
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msg.Type = TypeError
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msg.serial = conn.getSerial()
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msg.Headers = make(map[HeaderField]Variant)
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if dest != "" {
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msg.Headers[FieldDestination] = MakeVariant(dest)
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}
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msg.Headers[FieldErrorName] = MakeVariant(e.Name)
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msg.Headers[FieldReplySerial] = MakeVariant(serial)
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msg.Body = e.Body
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if len(e.Body) > 0 {
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msg.Headers[FieldSignature] = MakeVariant(SignatureOf(e.Body...))
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}
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conn.outLck.RLock()
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if !conn.closed {
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conn.out <- msg
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}
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conn.outLck.RUnlock()
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}
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// sendReply creates a method reply message corresponding to the parameters and
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// sends it to conn.out.
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func (conn *Conn) sendReply(dest string, serial uint32, values ...interface{}) {
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msg := new(Message)
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msg.Type = TypeMethodReply
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msg.serial = conn.getSerial()
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msg.Headers = make(map[HeaderField]Variant)
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if dest != "" {
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msg.Headers[FieldDestination] = MakeVariant(dest)
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}
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msg.Headers[FieldReplySerial] = MakeVariant(serial)
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msg.Body = values
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if len(values) > 0 {
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msg.Headers[FieldSignature] = MakeVariant(SignatureOf(values...))
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}
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conn.outLck.RLock()
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if !conn.closed {
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conn.out <- msg
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}
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conn.outLck.RUnlock()
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}
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// Signal registers the given channel to be passed all received signal messages.
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// The caller has to make sure that ch is sufficiently buffered; if a message
|
||||
// arrives when a write to c is not possible, it is discarded.
|
||||
//
|
||||
// Multiple of these channels can be registered at the same time.
|
||||
//
|
||||
// These channels are "overwritten" by Eavesdrop; i.e., if there currently is a
|
||||
// channel for eavesdropped messages, this channel receives all signals, and
|
||||
// none of the channels passed to Signal will receive any signals.
|
||||
func (conn *Conn) Signal(ch chan<- *Signal) {
|
||||
conn.signalsLck.Lock()
|
||||
conn.signals = append(conn.signals, ch)
|
||||
conn.signalsLck.Unlock()
|
||||
}
|
||||
|
||||
// RemoveSignal removes the given channel from the list of the registered channels.
|
||||
func (conn *Conn) RemoveSignal(ch chan<- *Signal) {
|
||||
conn.signalsLck.Lock()
|
||||
for i := len(conn.signals) - 1; i >= 0; i-- {
|
||||
if ch == conn.signals[i] {
|
||||
copy(conn.signals[i:], conn.signals[i+1:])
|
||||
conn.signals[len(conn.signals)-1] = nil
|
||||
conn.signals = conn.signals[:len(conn.signals)-1]
|
||||
}
|
||||
}
|
||||
conn.signalsLck.Unlock()
|
||||
}
|
||||
|
||||
// SupportsUnixFDs returns whether the underlying transport supports passing of
|
||||
// unix file descriptors. If this is false, method calls containing unix file
|
||||
// descriptors will return an error and emitted signals containing them will
|
||||
// not be sent.
|
||||
func (conn *Conn) SupportsUnixFDs() bool {
|
||||
return conn.unixFD
|
||||
}
|
||||
|
||||
// Error represents a D-Bus message of type Error.
|
||||
type Error struct {
|
||||
Name string
|
||||
Body []interface{}
|
||||
}
|
||||
|
||||
func NewError(name string, body []interface{}) *Error {
|
||||
return &Error{name, body}
|
||||
}
|
||||
|
||||
func (e Error) Error() string {
|
||||
if len(e.Body) >= 1 {
|
||||
s, ok := e.Body[0].(string)
|
||||
if ok {
|
||||
return s
|
||||
}
|
||||
}
|
||||
return e.Name
|
||||
}
|
||||
|
||||
// Signal represents a D-Bus message of type Signal. The name member is given in
|
||||
// "interface.member" notation, e.g. org.freedesktop.D-Bus.NameLost.
|
||||
type Signal struct {
|
||||
Sender string
|
||||
Path ObjectPath
|
||||
Name string
|
||||
Body []interface{}
|
||||
}
|
||||
|
||||
// transport is a D-Bus transport.
|
||||
type transport interface {
|
||||
// Read and Write raw data (for example, for the authentication protocol).
|
||||
io.ReadWriteCloser
|
||||
|
||||
// Send the initial null byte used for the EXTERNAL mechanism.
|
||||
SendNullByte() error
|
||||
|
||||
// Returns whether this transport supports passing Unix FDs.
|
||||
SupportsUnixFDs() bool
|
||||
|
||||
// Signal the transport that Unix FD passing is enabled for this connection.
|
||||
EnableUnixFDs()
|
||||
|
||||
// Read / send a message, handling things like Unix FDs.
|
||||
ReadMessage() (*Message, error)
|
||||
SendMessage(*Message) error
|
||||
}
|
||||
|
||||
var (
|
||||
transports = make(map[string]func(string) (transport, error))
|
||||
)
|
||||
|
||||
func getTransport(address string) (transport, error) {
|
||||
var err error
|
||||
var t transport
|
||||
|
||||
addresses := strings.Split(address, ";")
|
||||
for _, v := range addresses {
|
||||
i := strings.IndexRune(v, ':')
|
||||
if i == -1 {
|
||||
err = errors.New("dbus: invalid bus address (no transport)")
|
||||
continue
|
||||
}
|
||||
f := transports[v[:i]]
|
||||
if f == nil {
|
||||
err = errors.New("dbus: invalid bus address (invalid or unsupported transport)")
|
||||
continue
|
||||
}
|
||||
t, err = f(v[i+1:])
|
||||
if err == nil {
|
||||
return t, nil
|
||||
}
|
||||
}
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// dereferenceAll returns a slice that, assuming that vs is a slice of pointers
|
||||
// of arbitrary types, containes the values that are obtained from dereferencing
|
||||
// all elements in vs.
|
||||
func dereferenceAll(vs []interface{}) []interface{} {
|
||||
for i := range vs {
|
||||
v := reflect.ValueOf(vs[i])
|
||||
v = v.Elem()
|
||||
vs[i] = v.Interface()
|
||||
}
|
||||
return vs
|
||||
}
|
||||
|
||||
// getKey gets a key from a the list of keys. Returns "" on error / not found...
|
||||
func getKey(s, key string) string {
|
||||
for _, keyEqualsValue := range strings.Split(s, ",") {
|
||||
keyValue := strings.SplitN(keyEqualsValue, "=", 2)
|
||||
if len(keyValue) == 2 && keyValue[0] == key {
|
||||
return keyValue[1]
|
||||
}
|
||||
}
|
||||
return ""
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue