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686 B

package acme
import (
"sync"
)
// Simple thread-safe stack impl
type nonceStack struct {
lock sync.Mutex
stack []string
}
// Pushes a nonce to the stack.
// Doesn't push empty nonces, or if there's more than 100 nonces on the stack
func (ns *nonceStack) push(v string) {
if v == "" {
return
}
ns.lock.Lock()
defer ns.lock.Unlock()
if len(ns.stack) > 100 {
return
}
ns.stack = append(ns.stack, v)
}
// Pops a nonce from the stack.
// Returns empty string if there are no nonces
func (ns *nonceStack) pop() string {
ns.lock.Lock()
defer ns.lock.Unlock()
n := len(ns.stack)
if n == 0 {
return ""
}
v := ns.stack[n-1]
ns.stack = ns.stack[:n-1]
return v
}