File size: 1,338 Bytes
6a7089a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | package bridge
import (
"fmt"
"sync"
"time"
)
const DefaultLockTimeout = 10 * time.Minute
type lockEntry struct {
owner string
expires time.Time
}
type LockManager struct {
locks map[string]lockEntry
mu sync.Mutex
}
func NewLockManager() *LockManager {
return &LockManager{
locks: make(map[string]lockEntry),
}
}
func (m *LockManager) TryLock(tabID, owner string, ttl time.Duration) error {
m.mu.Lock()
defer m.mu.Unlock()
l, ok := m.locks[tabID]
if ok && time.Now().Before(l.expires) && l.owner != owner {
return fmt.Errorf("tab %s is locked by %s for another %v", tabID, l.owner, time.Until(l.expires).Round(time.Second))
}
m.locks[tabID] = lockEntry{
owner: owner,
expires: time.Now().Add(ttl),
}
return nil
}
func (m *LockManager) Unlock(tabID, owner string) error {
m.mu.Lock()
defer m.mu.Unlock()
l, ok := m.locks[tabID]
if !ok || time.Now().After(l.expires) {
delete(m.locks, tabID)
return nil
}
if l.owner != owner {
return fmt.Errorf("cannot unlock: tab %s is locked by %s", tabID, l.owner)
}
delete(m.locks, tabID)
return nil
}
func (m *LockManager) Get(tabID string) *LockInfo {
m.mu.Lock()
defer m.mu.Unlock()
l, ok := m.locks[tabID]
if !ok || time.Now().After(l.expires) {
return nil
}
return &LockInfo{
Owner: l.owner,
ExpiresAt: l.expires,
}
}
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