684 lines
18 KiB
Go
684 lines
18 KiB
Go
package dbus
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
"os"
|
|
"reflect"
|
|
"strings"
|
|
"sync"
|
|
)
|
|
|
|
var (
|
|
systemBus *Conn
|
|
systemBusLck sync.Mutex
|
|
sessionBus *Conn
|
|
sessionBusLck sync.Mutex
|
|
sessionEnvLck sync.Mutex
|
|
)
|
|
|
|
// ErrClosed is the error returned by calls on a closed connection.
|
|
var ErrClosed = errors.New("dbus: connection closed by user")
|
|
|
|
// Conn represents a connection to a message bus (usually, the system or
|
|
// session bus).
|
|
//
|
|
// Connections are either shared or private. Shared connections
|
|
// are shared between calls to the functions that return them. As a result,
|
|
// the methods Close, Auth and Hello must not be called on them.
|
|
//
|
|
// Multiple goroutines may invoke methods on a connection simultaneously.
|
|
type Conn struct {
|
|
transport
|
|
|
|
busObj BusObject
|
|
unixFD bool
|
|
uuid string
|
|
|
|
names []string
|
|
namesLck sync.RWMutex
|
|
|
|
serialLck sync.Mutex
|
|
nextSerial uint32
|
|
serialUsed map[uint32]bool
|
|
|
|
calls map[uint32]*Call
|
|
callsLck sync.RWMutex
|
|
|
|
handler Handler
|
|
|
|
out chan *Message
|
|
closed bool
|
|
outLck sync.RWMutex
|
|
|
|
signalHandler SignalHandler
|
|
|
|
eavesdropped chan<- *Message
|
|
eavesdroppedLck sync.Mutex
|
|
}
|
|
|
|
// SessionBus returns a shared connection to the session bus, connecting to it
|
|
// if not already done.
|
|
func SessionBus() (conn *Conn, err error) {
|
|
sessionBusLck.Lock()
|
|
defer sessionBusLck.Unlock()
|
|
if sessionBus != nil {
|
|
return sessionBus, nil
|
|
}
|
|
defer func() {
|
|
if conn != nil {
|
|
sessionBus = conn
|
|
}
|
|
}()
|
|
conn, err = SessionBusPrivate()
|
|
if err != nil {
|
|
return
|
|
}
|
|
if err = conn.Auth(nil); err != nil {
|
|
conn.Close()
|
|
conn = nil
|
|
return
|
|
}
|
|
if err = conn.Hello(); err != nil {
|
|
conn.Close()
|
|
conn = nil
|
|
}
|
|
return
|
|
}
|
|
|
|
func getSessionBusAddress() (string, error) {
|
|
sessionEnvLck.Lock()
|
|
defer sessionEnvLck.Unlock()
|
|
address := os.Getenv("DBUS_SESSION_BUS_ADDRESS")
|
|
if address != "" && address != "autolaunch:" {
|
|
return address, nil
|
|
}
|
|
return getSessionBusPlatformAddress()
|
|
}
|
|
|
|
// SessionBusPrivate returns a new private connection to the session bus.
|
|
func SessionBusPrivate() (*Conn, error) {
|
|
address, err := getSessionBusAddress()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return Dial(address)
|
|
}
|
|
|
|
// SessionBusPrivate returns a new private connection to the session bus.
|
|
func SessionBusPrivateHandler(handler Handler, signalHandler SignalHandler) (*Conn, error) {
|
|
address, err := getSessionBusAddress()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return DialHandler(address, handler, signalHandler)
|
|
}
|
|
|
|
// SystemBus returns a shared connection to the system bus, connecting to it if
|
|
// not already done.
|
|
func SystemBus() (conn *Conn, err error) {
|
|
systemBusLck.Lock()
|
|
defer systemBusLck.Unlock()
|
|
if systemBus != nil {
|
|
return systemBus, nil
|
|
}
|
|
defer func() {
|
|
if conn != nil {
|
|
systemBus = conn
|
|
}
|
|
}()
|
|
conn, err = SystemBusPrivate()
|
|
if err != nil {
|
|
return
|
|
}
|
|
if err = conn.Auth(nil); err != nil {
|
|
conn.Close()
|
|
conn = nil
|
|
return
|
|
}
|
|
if err = conn.Hello(); err != nil {
|
|
conn.Close()
|
|
conn = nil
|
|
}
|
|
return
|
|
}
|
|
|
|
// SystemBusPrivate returns a new private connection to the system bus.
|
|
func SystemBusPrivate() (*Conn, error) {
|
|
return Dial(getSystemBusPlatformAddress())
|
|
}
|
|
|
|
// SystemBusPrivateHandler returns a new private connection to the system bus, using the provided handlers.
|
|
func SystemBusPrivateHandler(handler Handler, signalHandler SignalHandler) (*Conn, error) {
|
|
return DialHandler(getSystemBusPlatformAddress(), handler, signalHandler)
|
|
}
|
|
|
|
// Dial establishes a new private connection to the message bus specified by address.
|
|
func Dial(address string) (*Conn, error) {
|
|
tr, err := getTransport(address)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return newConn(tr, NewDefaultHandler(), NewDefaultSignalHandler())
|
|
}
|
|
|
|
// DialHandler establishes a new private connection to the message bus specified by address, using the supplied handlers.
|
|
func DialHandler(address string, handler Handler, signalHandler SignalHandler) (*Conn, error) {
|
|
tr, err := getTransport(address)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return newConn(tr, handler, signalHandler)
|
|
}
|
|
|
|
// NewConn creates a new private *Conn from an already established connection.
|
|
func NewConn(conn io.ReadWriteCloser) (*Conn, error) {
|
|
return NewConnHandler(conn, NewDefaultHandler(), NewDefaultSignalHandler())
|
|
}
|
|
|
|
// NewConnHandler creates a new private *Conn from an already established connection, using the supplied handlers.
|
|
func NewConnHandler(conn io.ReadWriteCloser, handler Handler, signalHandler SignalHandler) (*Conn, error) {
|
|
return newConn(genericTransport{conn}, handler, signalHandler)
|
|
}
|
|
|
|
// newConn creates a new *Conn from a transport.
|
|
func newConn(tr transport, handler Handler, signalHandler SignalHandler) (*Conn, error) {
|
|
conn := new(Conn)
|
|
conn.transport = tr
|
|
conn.calls = make(map[uint32]*Call)
|
|
conn.out = make(chan *Message, 10)
|
|
conn.handler = handler
|
|
conn.signalHandler = signalHandler
|
|
conn.nextSerial = 1
|
|
conn.serialUsed = map[uint32]bool{0: true}
|
|
conn.busObj = conn.Object("org.freedesktop.DBus", "/org/freedesktop/DBus")
|
|
return conn, nil
|
|
}
|
|
|
|
// BusObject returns the object owned by the bus daemon which handles
|
|
// administrative requests.
|
|
func (conn *Conn) BusObject() BusObject {
|
|
return conn.busObj
|
|
}
|
|
|
|
// Close closes the connection. Any blocked operations will return with errors
|
|
// and the channels passed to Eavesdrop and Signal are closed. This method must
|
|
// not be called on shared connections.
|
|
func (conn *Conn) Close() error {
|
|
conn.outLck.Lock()
|
|
if conn.closed {
|
|
// inWorker calls Close on read error, the read error may
|
|
// be caused by another caller calling Close to shutdown the
|
|
// dbus connection, a double-close scenario we prevent here.
|
|
conn.outLck.Unlock()
|
|
return nil
|
|
}
|
|
close(conn.out)
|
|
conn.closed = true
|
|
conn.outLck.Unlock()
|
|
|
|
if term, ok := conn.signalHandler.(Terminator); ok {
|
|
term.Terminate()
|
|
}
|
|
|
|
if term, ok := conn.handler.(Terminator); ok {
|
|
term.Terminate()
|
|
}
|
|
|
|
conn.eavesdroppedLck.Lock()
|
|
if conn.eavesdropped != nil {
|
|
close(conn.eavesdropped)
|
|
}
|
|
conn.eavesdroppedLck.Unlock()
|
|
|
|
return conn.transport.Close()
|
|
}
|
|
|
|
// Eavesdrop causes conn to send all incoming messages to the given channel
|
|
// without further processing. Method replies, errors and signals will not be
|
|
// sent to the appropiate channels and method calls will not be handled. If nil
|
|
// is passed, the normal behaviour is restored.
|
|
//
|
|
// The caller has to make sure that ch is sufficiently buffered;
|
|
// if a message arrives when a write to ch is not possible, the message is
|
|
// discarded.
|
|
func (conn *Conn) Eavesdrop(ch chan<- *Message) {
|
|
conn.eavesdroppedLck.Lock()
|
|
conn.eavesdropped = ch
|
|
conn.eavesdroppedLck.Unlock()
|
|
}
|
|
|
|
// getSerial returns an unused serial.
|
|
func (conn *Conn) getSerial() uint32 {
|
|
conn.serialLck.Lock()
|
|
defer conn.serialLck.Unlock()
|
|
n := conn.nextSerial
|
|
for conn.serialUsed[n] {
|
|
n++
|
|
}
|
|
conn.serialUsed[n] = true
|
|
conn.nextSerial = n + 1
|
|
return n
|
|
}
|
|
|
|
// Hello sends the initial org.freedesktop.DBus.Hello call. This method must be
|
|
// called after authentication, but before sending any other messages to the
|
|
// bus. Hello must not be called for shared connections.
|
|
func (conn *Conn) Hello() error {
|
|
var s string
|
|
err := conn.busObj.Call("org.freedesktop.DBus.Hello", 0).Store(&s)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
conn.namesLck.Lock()
|
|
conn.names = make([]string, 1)
|
|
conn.names[0] = s
|
|
conn.namesLck.Unlock()
|
|
return nil
|
|
}
|
|
|
|
// inWorker runs in an own goroutine, reading incoming messages from the
|
|
// transport and dispatching them appropiately.
|
|
func (conn *Conn) inWorker() {
|
|
for {
|
|
msg, err := conn.ReadMessage()
|
|
if err == nil {
|
|
conn.eavesdroppedLck.Lock()
|
|
if conn.eavesdropped != nil {
|
|
select {
|
|
case conn.eavesdropped <- msg:
|
|
default:
|
|
}
|
|
conn.eavesdroppedLck.Unlock()
|
|
continue
|
|
}
|
|
conn.eavesdroppedLck.Unlock()
|
|
dest, _ := msg.Headers[FieldDestination].value.(string)
|
|
found := false
|
|
if dest == "" {
|
|
found = true
|
|
} else {
|
|
conn.namesLck.RLock()
|
|
if len(conn.names) == 0 {
|
|
found = true
|
|
}
|
|
for _, v := range conn.names {
|
|
if dest == v {
|
|
found = true
|
|
break
|
|
}
|
|
}
|
|
conn.namesLck.RUnlock()
|
|
}
|
|
if !found {
|
|
// Eavesdropped a message, but no channel for it is registered.
|
|
// Ignore it.
|
|
continue
|
|
}
|
|
switch msg.Type {
|
|
case TypeMethodReply, TypeError:
|
|
serial := msg.Headers[FieldReplySerial].value.(uint32)
|
|
conn.callsLck.Lock()
|
|
if c, ok := conn.calls[serial]; ok {
|
|
if msg.Type == TypeError {
|
|
name, _ := msg.Headers[FieldErrorName].value.(string)
|
|
c.Err = Error{name, msg.Body}
|
|
} else {
|
|
c.Body = msg.Body
|
|
}
|
|
c.Done <- c
|
|
conn.serialLck.Lock()
|
|
delete(conn.serialUsed, serial)
|
|
conn.serialLck.Unlock()
|
|
delete(conn.calls, serial)
|
|
}
|
|
conn.callsLck.Unlock()
|
|
case TypeSignal:
|
|
iface := msg.Headers[FieldInterface].value.(string)
|
|
member := msg.Headers[FieldMember].value.(string)
|
|
// as per http://dbus.freedesktop.org/doc/dbus-specification.html ,
|
|
// sender is optional for signals.
|
|
sender, _ := msg.Headers[FieldSender].value.(string)
|
|
if iface == "org.freedesktop.DBus" && sender == "org.freedesktop.DBus" {
|
|
if member == "NameLost" {
|
|
// If we lost the name on the bus, remove it from our
|
|
// tracking list.
|
|
name, ok := msg.Body[0].(string)
|
|
if !ok {
|
|
panic("Unable to read the lost name")
|
|
}
|
|
conn.namesLck.Lock()
|
|
for i, v := range conn.names {
|
|
if v == name {
|
|
conn.names = append(conn.names[:i],
|
|
conn.names[i+1:]...)
|
|
}
|
|
}
|
|
conn.namesLck.Unlock()
|
|
} else if member == "NameAcquired" {
|
|
// If we acquired the name on the bus, add it to our
|
|
// tracking list.
|
|
name, ok := msg.Body[0].(string)
|
|
if !ok {
|
|
panic("Unable to read the acquired name")
|
|
}
|
|
conn.namesLck.Lock()
|
|
conn.names = append(conn.names, name)
|
|
conn.namesLck.Unlock()
|
|
}
|
|
}
|
|
conn.handleSignal(msg)
|
|
case TypeMethodCall:
|
|
go conn.handleCall(msg)
|
|
}
|
|
} else if _, ok := err.(InvalidMessageError); !ok {
|
|
// Some read error occured (usually EOF); we can't really do
|
|
// anything but to shut down all stuff and returns errors to all
|
|
// pending replies.
|
|
conn.Close()
|
|
conn.callsLck.RLock()
|
|
for _, v := range conn.calls {
|
|
v.Err = err
|
|
v.Done <- v
|
|
}
|
|
conn.callsLck.RUnlock()
|
|
return
|
|
}
|
|
// invalid messages are ignored
|
|
}
|
|
}
|
|
|
|
func (conn *Conn) handleSignal(msg *Message) {
|
|
iface := msg.Headers[FieldInterface].value.(string)
|
|
member := msg.Headers[FieldMember].value.(string)
|
|
// as per http://dbus.freedesktop.org/doc/dbus-specification.html ,
|
|
// sender is optional for signals.
|
|
sender, _ := msg.Headers[FieldSender].value.(string)
|
|
signal := &Signal{
|
|
Sender: sender,
|
|
Path: msg.Headers[FieldPath].value.(ObjectPath),
|
|
Name: iface + "." + member,
|
|
Body: msg.Body,
|
|
}
|
|
conn.signalHandler.DeliverSignal(iface, member, signal)
|
|
}
|
|
|
|
// Names returns the list of all names that are currently owned by this
|
|
// connection. The slice is always at least one element long, the first element
|
|
// being the unique name of the connection.
|
|
func (conn *Conn) Names() []string {
|
|
conn.namesLck.RLock()
|
|
// copy the slice so it can't be modified
|
|
s := make([]string, len(conn.names))
|
|
copy(s, conn.names)
|
|
conn.namesLck.RUnlock()
|
|
return s
|
|
}
|
|
|
|
// Object returns the object identified by the given destination name and path.
|
|
func (conn *Conn) Object(dest string, path ObjectPath) BusObject {
|
|
return &Object{conn, dest, path}
|
|
}
|
|
|
|
// outWorker runs in an own goroutine, encoding and sending messages that are
|
|
// sent to conn.out.
|
|
func (conn *Conn) outWorker() {
|
|
for msg := range conn.out {
|
|
err := conn.SendMessage(msg)
|
|
conn.callsLck.RLock()
|
|
if err != nil {
|
|
if c := conn.calls[msg.serial]; c != nil {
|
|
c.Err = err
|
|
c.Done <- c
|
|
}
|
|
conn.serialLck.Lock()
|
|
delete(conn.serialUsed, msg.serial)
|
|
conn.serialLck.Unlock()
|
|
} else if msg.Type != TypeMethodCall {
|
|
conn.serialLck.Lock()
|
|
delete(conn.serialUsed, msg.serial)
|
|
conn.serialLck.Unlock()
|
|
}
|
|
conn.callsLck.RUnlock()
|
|
}
|
|
}
|
|
|
|
// Send sends the given message to the message bus. You usually don't need to
|
|
// use this; use the higher-level equivalents (Call / Go, Emit and Export)
|
|
// instead. If msg is a method call and NoReplyExpected is not set, a non-nil
|
|
// call is returned and the same value is sent to ch (which must be buffered)
|
|
// once the call is complete. Otherwise, ch is ignored and a Call structure is
|
|
// returned of which only the Err member is valid.
|
|
func (conn *Conn) Send(msg *Message, ch chan *Call) *Call {
|
|
var call *Call
|
|
|
|
msg.serial = conn.getSerial()
|
|
if msg.Type == TypeMethodCall && msg.Flags&FlagNoReplyExpected == 0 {
|
|
if ch == nil {
|
|
ch = make(chan *Call, 5)
|
|
} else if cap(ch) == 0 {
|
|
panic("dbus: unbuffered channel passed to (*Conn).Send")
|
|
}
|
|
call = new(Call)
|
|
call.Destination, _ = msg.Headers[FieldDestination].value.(string)
|
|
call.Path, _ = msg.Headers[FieldPath].value.(ObjectPath)
|
|
iface, _ := msg.Headers[FieldInterface].value.(string)
|
|
member, _ := msg.Headers[FieldMember].value.(string)
|
|
call.Method = iface + "." + member
|
|
call.Args = msg.Body
|
|
call.Done = ch
|
|
conn.callsLck.Lock()
|
|
conn.calls[msg.serial] = call
|
|
conn.callsLck.Unlock()
|
|
conn.outLck.RLock()
|
|
if conn.closed {
|
|
call.Err = ErrClosed
|
|
call.Done <- call
|
|
} else {
|
|
conn.out <- msg
|
|
}
|
|
conn.outLck.RUnlock()
|
|
} else {
|
|
conn.outLck.RLock()
|
|
if conn.closed {
|
|
call = &Call{Err: ErrClosed}
|
|
} else {
|
|
conn.out <- msg
|
|
call = &Call{Err: nil}
|
|
}
|
|
conn.outLck.RUnlock()
|
|
}
|
|
return call
|
|
}
|
|
|
|
// sendError creates an error message corresponding to the parameters and sends
|
|
// it to conn.out.
|
|
func (conn *Conn) sendError(err error, dest string, serial uint32) {
|
|
var e *Error
|
|
switch em := err.(type) {
|
|
case Error:
|
|
e = &em
|
|
case *Error:
|
|
e = em
|
|
case DBusError:
|
|
name, body := em.DBusError()
|
|
e = NewError(name, body)
|
|
default:
|
|
e = MakeFailedError(err)
|
|
}
|
|
msg := new(Message)
|
|
msg.Type = TypeError
|
|
msg.serial = conn.getSerial()
|
|
msg.Headers = make(map[HeaderField]Variant)
|
|
if dest != "" {
|
|
msg.Headers[FieldDestination] = MakeVariant(dest)
|
|
}
|
|
msg.Headers[FieldErrorName] = MakeVariant(e.Name)
|
|
msg.Headers[FieldReplySerial] = MakeVariant(serial)
|
|
msg.Body = e.Body
|
|
if len(e.Body) > 0 {
|
|
msg.Headers[FieldSignature] = MakeVariant(SignatureOf(e.Body...))
|
|
}
|
|
conn.outLck.RLock()
|
|
if !conn.closed {
|
|
conn.out <- msg
|
|
}
|
|
conn.outLck.RUnlock()
|
|
}
|
|
|
|
// sendReply creates a method reply message corresponding to the parameters and
|
|
// sends it to conn.out.
|
|
func (conn *Conn) sendReply(dest string, serial uint32, values ...interface{}) {
|
|
msg := new(Message)
|
|
msg.Type = TypeMethodReply
|
|
msg.serial = conn.getSerial()
|
|
msg.Headers = make(map[HeaderField]Variant)
|
|
if dest != "" {
|
|
msg.Headers[FieldDestination] = MakeVariant(dest)
|
|
}
|
|
msg.Headers[FieldReplySerial] = MakeVariant(serial)
|
|
msg.Body = values
|
|
if len(values) > 0 {
|
|
msg.Headers[FieldSignature] = MakeVariant(SignatureOf(values...))
|
|
}
|
|
conn.outLck.RLock()
|
|
if !conn.closed {
|
|
conn.out <- msg
|
|
}
|
|
conn.outLck.RUnlock()
|
|
}
|
|
|
|
func (conn *Conn) defaultSignalAction(fn func(h *defaultSignalHandler, ch chan<- *Signal), ch chan<- *Signal) {
|
|
if !isDefaultSignalHandler(conn.signalHandler) {
|
|
return
|
|
}
|
|
handler := conn.signalHandler.(*defaultSignalHandler)
|
|
fn(handler, ch)
|
|
}
|
|
|
|
// Signal registers the given channel to be passed all received signal messages.
|
|
// 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.defaultSignalAction((*defaultSignalHandler).addSignal, ch)
|
|
}
|
|
|
|
// RemoveSignal removes the given channel from the list of the registered channels.
|
|
func (conn *Conn) RemoveSignal(ch chan<- *Signal) {
|
|
conn.defaultSignalAction((*defaultSignalHandler).removeSignal, ch)
|
|
}
|
|
|
|
// 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 ""
|
|
}
|