You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: semaphore.go
    path of file: ./repos/hubble-ui/backend/vendor/github.com/hashicorp/consul/api
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package api

import (
	"encoding/json"
	"fmt"
	"path"
	"sync"
	"time"
)

const (
	// DefaultSemaphoreSessionName is the Session Name we assign if none is provided
	DefaultSemaphoreSessionName = "Consul API Semaphore"

	// DefaultSemaphoreSessionTTL is the default session TTL if no Session is provided
	// when creating a new Semaphore. This is used because we do not have another
	// other check to depend upon.
	DefaultSemaphoreSessionTTL = "15s"

	// DefaultSemapho
    
func (s *Semaphore) Destroy() error {
	// Hold the lock as we try to acquire
	s.l.Lock()
	defer s.l.Unlock()

	// Check if we already hold the semaphore
	if s.isHeld {
		return ErrSemaphoreHeld
	}

	// List for the semaphore
	kv := s.c.KV()

	q := QueryOptions{Namespace: s.opts.Namespace}
	pairs, _, err := kv.List(s.opts.Prefix, &q)
	if err != nil {
		return fmt.Errorf("failed to read prefix: %v", err)
	}

	// Find the lock pair, bail if it doesn't exist
	lockPair := s.findLock(pairs)
	if lockPair.ModifyIndex == 0 {
		return nil
	}
	if lockPair.Flags != SemaphoreFlagValue {
		return ErrSemaphoreConflict
	}

	// Decode the lock
	lock, err := s.decodeLock(lockPair)
	if err != nil {
		return err
	}

	// Prune the dead holders
	s.pruneDeadHolders(lock, pairs)

	// Check if there are any holders
	if len(lock.Holders) > 0 {
		return ErrSemaphoreInUse
	}

	// Attempt the delete
	w := WriteOptions{Namespace: s.opts.Namespace}
	didRemove, _, err := kv.DeleteCAS(lockPair, &w)
	if err != nil {
		return fmt.Errorf("failed to remove semaphore: %v", err)
	}
	if !didRemove {
		return ErrSemaphoreInUse
	}
	return nil
}