client: generic list

[greut]

In a nutshell

vm := &egoscale.VirtualMachine{ZoneID: ...}
vms, err := client.List(vm)
if err != nil {
    panic(err)
}
for _, i := range vms {
    vm := i.(egoscale.VirtualMachine)
    ...
}

other calls:

• ListWithContext(ctx, vm) ([]interface{}, error)
• AsyncList(vm) (<-chan interface{}, <-chan error)
• AsyncListWithContext(ctx, vm) (<-chan interface{}, <-chan error)

TODO:

• replace ListNics
• replace GetRootVolumeForVirtualMachine

[marcaurele]

Risky! Between pagination call the count can increase or decrease. You're best bet is to stop paginating when the page result is empty.

[greut]

don't trust Count and paginate until a failure occurs?

[greut]

if the result size is smaller than the page size we abort.