// changeInterfaces controls the interfaces system.
// Plugs can be connected to and disconnected from slots.
// When enableInternalInterfaceActions is true plugs and slots can also be
// explicitly added and removed.
func changeInterfaces(c *Command, r *http.Request) Response {
var a interfaceAction
decoder := json.NewDecoder(r.Body)
if err := decoder.Decode(&a); err != nil {
return BadRequest("cannot decode request body into an interface action: %v", err)
}
if a.Action == "" {
return BadRequest("interface action not specified")
}
if !c.d.enableInternalInterfaceActions && a.Action != "connect" && a.Action != "disconnect" {
return BadRequest("internal interface actions are disabled")
}
if len(a.Plugs) > 1 || len(a.Slots) > 1 {
return NotImplemented("many-to-many operations are not implemented")
}
if a.Action != "connect" && a.Action != "disconnect" {
return BadRequest("unsupported interface action: %q", a.Action)
}
if len(a.Plugs) == 0 || len(a.Slots) == 0 {
return BadRequest("at least one plug and slot is required")
}
var change *state.Change
var taskset *state.TaskSet
var err error
state := c.d.overlord.State()
state.Lock()
defer state.Unlock()
switch a.Action {
case "connect":
summary := fmt.Sprintf("Connect %s:%s to %s:%s", a.Plugs[0].Snap, a.Plugs[0].Name, a.Slots[0].Snap, a.Slots[0].Name)
change = state.NewChange("connect-snap", summary)
taskset, err = ifacestate.Connect(state, a.Plugs[0].Snap, a.Plugs[0].Name, a.Slots[0].Snap, a.Slots[0].Name)
case "disconnect":
summary := fmt.Sprintf("Disconnect %s:%s from %s:%s", a.Plugs[0].Snap, a.Plugs[0].Name, a.Slots[0].Snap, a.Slots[0].Name)
change = state.NewChange("disconnect-snap", summary)
taskset, err = ifacestate.Disconnect(state, a.Plugs[0].Snap, a.Plugs[0].Name, a.Slots[0].Snap, a.Slots[0].Name)
}
if err == nil {
change.AddAll(taskset)
}
if err != nil {
return BadRequest("%v", err)
}
state.EnsureBefore(0)
return AsyncResponse(nil, &Meta{Change: change.ID()})
}
func installSnap(chg *state.Change, name, channel string, userID int, flags snappy.InstallFlags) error {
st := chg.State()
ts, err := snapstateInstall(st, name, channel, userID, flags)
if err != nil {
return err
}
// ensure that each of our task runs after the existing tasks
chgts := state.NewTaskSet(chg.Tasks()...)
for _, t := range ts.Tasks() {
t.WaitAll(chgts)
}
chg.AddAll(ts)
return nil
}