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package local
import (
"sort"
"strings"
"sync"
)
type Target struct {
Cluster string
Name string
}
type Placement struct {
Cluster string
Workspace string
Key string
}
type engagement struct {
cluster string
clusters map[string]bool
}
type Holders struct {
mu sync.Mutex
engaged map[string]*engagement
keys map[Target][]string
holders map[string]map[Target]bool
}
func NewHolders() *Holders {
return &Holders{engaged: map[string]*engagement{}, keys: map[Target][]string{}, holders: map[string]map[Target]bool{}}
}
func (h *Holders) Engage(workspace, cluster, name string) {
workspace, cluster, name = strings.TrimSpace(workspace), strings.TrimSpace(cluster), strings.TrimSpace(name)
if workspace == "" || cluster == "" {
return
}
h.mu.Lock()
defer h.mu.Unlock()
e := h.engaged[workspace]
if e == nil || e.cluster != cluster {
e = &engagement{cluster: cluster, clusters: map[string]bool{}}
h.engaged[workspace] = e
}
if name != "" {
e.clusters[name] = true
}
}
func (h *Holders) Hold(t Target, keys ...string) {
h.mu.Lock()
defer h.mu.Unlock()
h.dropLocked(t)
kept := unique(keys)
if len(kept) == 0 {
return
}
h.keys[t] = kept
for _, k := range kept {
if h.holders[k] == nil {
h.holders[k] = map[Target]bool{}
}
h.holders[k][t] = true
}
}
func (h *Holders) Drop(t Target, extra ...string) []string {
h.mu.Lock()
defer h.mu.Unlock()
keys := unique(append(h.dropLocked(t), extra...))
free := keys[:0]
for _, k := range keys {
if len(h.holders[k]) == 0 {
free = append(free, k)
}
}
return free
}
func (h *Holders) Held(key string) bool {
h.mu.Lock()
defer h.mu.Unlock()
return len(h.holders[key]) > 0
}
func (h *Holders) Pending(workspace string, keys []string) []string {
h.mu.Lock()
defer h.mu.Unlock()
return h.pendingLocked(workspace, keys)
}
func (h *Holders) Placements(keys []string) []Placement {
h.mu.Lock()
defer h.mu.Unlock()
workspaces := make([]string, 0, len(h.engaged))
for ws := range h.engaged {
workspaces = append(workspaces, ws)
}
sort.Strings(workspaces)
var out []Placement
for _, ws := range workspaces {
for _, k := range h.pendingLocked(ws, keys) {
out = append(out, Placement{Cluster: h.engaged[ws].cluster, Workspace: ws, Key: k})
}
}
return out
}
func (h *Holders) pendingLocked(workspace string, keys []string) []string {
e := h.engaged[strings.TrimSpace(workspace)]
if e == nil {
return nil
}
var out []string
for _, k := range unique(keys) {
home, ok := ParseKey(k)
if !ok || !home.In(workspace, e.clusters) || len(h.holders[k]) > 0 {
continue
}
out = append(out, k)
}
return out
}
func (h *Holders) dropLocked(t Target) []string {
keys := h.keys[t]
delete(h.keys, t)
for _, k := range keys {
delete(h.holders[k], t)
if len(h.holders[k]) == 0 {
delete(h.holders, k)
}
}
return keys
}
func unique(keys []string) []string {
seen := make(map[string]bool, len(keys))
out := make([]string, 0, len(keys))
for _, k := range keys {
k = strings.TrimSpace(k)
if k == "" || seen[k] {
continue
}
seen[k] = true
out = append(out, k)
}
return out
}
