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: assignments.go
    path of file: ./repos/moby/vendor/github.com/moby/swarmkit/v2/manager/dispatcher
    
    the code of the file until where you have to start completion: package dispatcher

import (
	"fmt"

	"github.com/moby/swarmkit/v2/api"
	"github.com/moby/swarmkit/v2/api/equality"
	"github.com/moby/swarmkit/v2/api/validation"
	"github.com/moby/swarmkit/v2/identity"
	"github.com/moby/swarmkit/v2/log"
	"github.com/moby/swarmkit/v2/manager/drivers"
	"github.com/moby/swarmkit/v2/manager/state/store"
	"github.com/sirupsen/logrus"
)

type typeAndID struct {
	id      strin
    
func assignSecret(a *assignmentSet, readTx store.ReadTx, mapKey typeAndID, t *api.Task) {
	if _, exists := a.tasksUsingDependency[mapKey]; !exists {
		a.tasksUsingDependency[mapKey] = make(map[string]struct{})
	}
	secret, doNotReuse, err := a.secret(readTx, t, mapKey.id)
	if err != nil {
		a.log.WithFields(log.Fields{
			"resource.type": "secret",
			"secret.id":     mapKey.id,
			"error":         err,
		}).Debug("failed to fetch secret")
		return
	}
	// If the secret should not be reused for other tasks, give it a unique ID
	// for the task to allow different values for different tasks.
	if doNotReuse {
		// Give the secret a new ID and mark it as internal
		originalSecretID := secret.ID
		taskSpecificID := identity.CombineTwoIDs(originalSecretID, t.ID)
		secret.ID = taskSpecificID
		secret.Internal = true
		// Create a new mapKey with the new ID and insert it into the
		// dependencies map for the task.  This will make the changes map
		// contain an entry with the new ID rather than the original one.
		mapKey = typeAndID{objType: mapKey.objType, id: secret.ID}
		a.tasksUsingDependency[mapKey] = make(map[string]struct{})
		a.tasksUsingDependency[mapKey][t.ID] = struct{}{}
	}
	a.changes[mapKey] = &api.AssignmentChange{
		Assignment: &api.Assignment{
			Item: &api.Assignment_Secret{
				Secret: secret,
			},
		},
		Action: api.AssignmentChange_AssignmentActionUpdate,
	}
}