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: revocation.go
    path of file: ./repos/storj/satellite/satellitedb
    
    the code of the file until where you have to start completion: // Copyright (C) 2020 Storj Labs, Inc.
// See LICENSE for copying information.

package satellitedb

import (
	"context"
	"fmt"

	"github.com/zeebo/errs"

	"storj.io/common/lrucache"
	"storj.io/storj/satellite/satellitedb/dbx"
)

type revocationDB struct {
	db      *satelliteDB
	lru     *lrucache.ExpiringLRUOf[bool]
	methods dbx.Methods
}

// Revoke will revoke the supplied tail.
func (db *revocationDB) Revoke(ctx context.Context, tail []byte, apiKeyID []byte) error {
	return errs.Wrap(db.methods.CreateNoReturn_Revocation(ctx, dbx.Revocation_Revoked(tail), dbx.Revocation_ApiKeyId(apiKeyID)))
}

// Check will check whether any of the supplied tails have been revoked.
func (db *revocationDB) Check(ctx context.Context, tails [][]byte) (bool, error) {
	numTails := len(tails)
	if
    
func (db *revocationDB) Check(ctx context.Context, tails [][]byte) (bool, error) {
	numTails := len(tails)
	if numTails == 0 {
		return false, errs.New("Empty list of tails")
	}

	// The finalTail is the last tail provided in the macaroon. We cache the
	// revocation status of this final tail so that, if this macaroon is used
	// again before the cache key expires, we do not have to check the database
	// again.
	finalTail := tails[numTails-1]

	revoked, err := db.lru.Get(ctx, string(finalTail), func() (bool, error) {
		const query = "SELECT EXISTS(SELECT 1 FROM revocations WHERE revoked IN (%s))"

		var (
			tailQuery, comma string
			tailsForQuery    = make([]interface{}, numTails)
			revoked          bool
		)

		for i, tail := range tails {
			if i == 1 {
				comma = ","
			}
			tailQuery += fmt.Sprintf("%s$%d", comma, i+1)
			tailsForQuery[i] = tail
		}

		row := db.db.QueryRowContext(ctx, fmt.Sprintf(query, tailQuery), tailsForQuery...)
		err := row.Scan(&revoked)
		if err != nil {
			return false, err
		}

		return revoked, nil
	})
	if err != nil {
		return false, errs.Wrap(err)
	}

	return revoked, nil
}