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package dbus
import (
"context"
"errors"
)
var errSignature = errors.New("dbus: mismatched signature")
// Call represents a pending or completed method call.
type Call struct {
Destination string
Path ObjectPath
Method string
Args []interface{}
// Strobes when the call is complete.
Done chan *Call
// After completion, the error status. If this is non-nil, it may be an
// error message from the peer (with Error as its type) or some other error.
Err error
// Holds the response once the call is done.
Body []interface{}
// ResponseSequence stores the sequence number of the DBus message containing
// the call response (or error). This can be compared to the sequence number
// of other call responses and signals on this connection to determine their
// relative ordering on the underlying DBus connection.
// For errors, ResponseSequence is populated only if the error came from a
// DBusMessage that was received or if there was an error receiving. In case of
// failure to make the call, ResponseSequence will be NoSequence.
ResponseSequence Sequence
// tracks context and canceler
ctx context.Context
ctxCanceler context.CancelFunc
}
func (c *Call) Context() context.Context {
if c.ctx == nil {
return context.Background()
}
return c.ctx
}
func (c *Call) ContextCancel() {
if c.ctxCanceler != nil {
c.ctxCanceler()
}
}
// Store stores the body of the reply into the provided pointers. It returns
// an error if the signatures of the body and retvalues don't match, or if
// the error status is not nil.
func (c *Call) Store(retvalues ...interface{}) error {
if c.Err != nil {
return c.Err
}
return Store(c.Body, retvalues...)
}
func (c *Call) done() {
c.Done <- c
c.ContextCancel()
}
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