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package zoopb
// this is becoming a standard format
// todo: autogenerate this from the .proto file?
import (
"fmt"
"os"
"sort"
sync "sync"
"time"
)
// bad global lock until I figure out some other plan
var machinesLock sync.RWMutex
type MachineIterator struct {
sync.RWMutex
packs []*Machine
index int
}
// NewMachineIterator initializes a new iterator.
func NewMachineIterator(packs []*Machine) *MachineIterator {
return &MachineIterator{packs: packs}
}
// Scan moves to the next element and returns false if there are no more packs.
func (it *MachineIterator) Scan() bool {
if it.index >= len(it.packs) {
return false
}
it.index++
return true
}
// Machine returns the current repo.
func (it *MachineIterator) Machine() *Machine {
if it.packs[it.index-1] == nil {
for i, d := range it.packs {
fmt.Println("i =", i, d)
}
fmt.Println("len =", len(it.packs))
fmt.Println("repo == nil", it.index, it.index-1)
os.Exit(-1)
}
return it.packs[it.index-1]
}
// Use Scan() in a loop, similar to a while loop
//
// for iterator.Scan() {
// d := iterator.Machine()
// fmt.Println("Machine UUID:", d.Uuid)
// }
func (r *Machines) All() *MachineIterator {
repoPointers := r.selectAllMachines()
iterator := NewMachineIterator(repoPointers)
return iterator
}
func (r *Machines) SortByName() *MachineIterator {
packs := r.selectAllMachines()
sort.Sort(ByMachineName(packs))
iterator := NewMachineIterator(packs)
return iterator
}
// enforces no duplicate package names
func (r *Machines) Append(newP *Machine) bool {
machinesLock.Lock()
defer machinesLock.Unlock()
for _, p := range r.Machines {
if p.Hostname == newP.Hostname {
return false
}
}
r.Machines = append(r.Machines, newP)
return true
}
// returns time.Duration since last Update()
func (r *Machine) Age(newP *Machine) time.Duration {
t := time.Since(r.Laststamp.AsTime())
return t
}
// find a package by name
func (r *Machines) FindByName(name string) *Machine {
machinesLock.RLock()
defer machinesLock.RUnlock()
for _, p := range r.Machines {
if p.Hostname == name {
return p
}
}
return nil
}
func (r *Machines) Len() int {
machinesLock.RLock()
defer machinesLock.RUnlock()
return len(r.Machines)
}
type ByMachineName []*Machine
func (a ByMachineName) Len() int { return len(a) }
func (a ByMachineName) Less(i, j int) bool { return a[i].Hostname < a[j].Hostname }
func (a ByMachineName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
// safely returns a slice of pointers to the Machine protobufs
func (r *Machines) selectAllMachines() []*Machine {
machinesLock.RLock()
defer machinesLock.RUnlock()
// Create a new slice to hold pointers to each Machine
var allPacks []*Machine
allPacks = make([]*Machine, len(r.Machines))
for i, p := range r.Machines {
allPacks[i] = p // Copy pointers for safe iteration
}
return allPacks
}
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